Downhole device for instillation in well bore in underground area and method of flow regulation in well bore

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to downhole devices for instillation in the well bore in the underground area and methods of flow regulation in the well bore. Technical result lies in effective regulation of fluid flow. The downhole device for instillation in the well bore in the underground area contains the first fluid diode having the first inner surface limiting the first inner chamber and output of the first inner chamber, at that the first inner surface facilitates fluid swirling when it is directed to the output; and the second fluid diode having the second inner surface limiting the second inner chamber in fluid communication with the above output, moreover the second inner surface facilitates fluid swirling when the swirling fluid is received through the above output. In the method of flow regulation in the well bore in the underground area fluid is transferred through the first fluid diode and the second fluid diode through the channel between inner space of the downhole device and its outer space in the underground area.

EFFECT: while transferring fluid through the first and second fluid diodes fluid swirling is ensured in the first and second fluid diodes.

18 cl, 6 dwg

 

Cross references to related applications

This application is a partial continuation of application U.S. serial number 12/879846, filed September 10, 2010. A full description of this application are incorporated herein by reference.

The technical field to which the invention relates.

The invention generally relates to methods and equipment used in the technological processes associated with the exploitation of subterranean wells and, as described below option, in particular to the series-connected devices regulate the flow resistance in the underground well.

The level of technology

The most important task in the extraction of hydrocarbons downhole method is to effectively regulate the flow of fluids coming from the geological formation into the wellbore. Effective regulation can be solved a number of problems, including preventing the formation of water and gas cones, minimization of sand, minimizing the removal of water and/or gas, the marginal efficiency of oil and/or gas, the efficient allocation of productive zones, etc.

The main objective usually is to ensure a steady supply of water, steam, gas, etc. via the injection well into many zones for uniform distribution of hydrocarbons in geological formation is about avoiding premature breakthrough of injected fluid to the trunk productive wells. The optimal regulation of the fluid flow flowing from the wellbore in a geological formation, it also features a helpful effect in relation to the operation of injection wells.

Thus, it is clear that given above for solving the problem of effective regulation of the flow of fluid in the borehole, it is desirable to offer the invention, which is characterized by advanced technology, and this improvement can also be useful in other circumstances.

Disclosure of inventions

Below is a description of the proposed system of regulation of the flow resistance, which is characterized by advanced technology in the regulation of fluid flow in wells. The following describes one variant, in which the resistance of the stream flowing through the cyclone device depends on the rotation of the multicomponent fluid entering the cyclone device. Described another option, in which multiple cyclone devices are connected in series.

One aspect of the present invention provides improvements to the existing prior art, is to create a system of regulation of the flow resistance for use in subterranean wells. This system includes a cyclone device through which flows Megaco pointy fluid. The resistance of the multicomponent fluid flowing through the cyclone device depends on the rotation of the multicomponent fluid inlet cyclone device.

Another aspect of the present invention is that the system of regulation of the flow resistance includes a first cyclone unit having an output, and a second cyclone unit, the input of which the output of the first cyclone device comes multicomponent fluid. Resistance multicomponent stream flowing through the second cyclone device depends on the rotation of the multicomponent fluid at the outlet of the first cyclone device.

Another aspect of the present invention is that the system of regulation of the flow resistance includes a first cyclone device that by increasing the speed of multicomponent fluid increases the rate of rotation of the multicomponent fluid at the outlet of the first cyclone unit, and a second cyclone unit, the input of which the output of the first cyclone device comes multicomponent fluid. Resistance multicomponent stream flowing through the second cyclone device depends on the rotation of the multicomponent fluid at the outlet of the first cyclone device.

Below the description of the downhole device to the mouth of the unit in the well bore in the subterranean zone. The example of one way in which the device includes a first hydraulic diode having a first inner surface bounding a first internal chamber, and output the first internal chamber, the first inner surface facilitates twisting of the fluid in the direction of its output; and a second hydraulic diode having a second inner surface bounding a second internal chamber being in hydraulic communication with the specified output, and a second inner surface facilitates twisting of the fluid when the flow of a rotating fluid through the specified output.

Below describes how to regulate flow through the wellbore into the subterranean zone. The example of one way in which the method includes passing fluid through the first hydraulic diode and the second hydraulic diode channel between internal and external spaces of the downhole device in the underground area. When the transmission fluid through the first hydraulic diode and the second hydraulic diode provide the twisting of the fluid in the first hydraulic diode and twisting of the fluid in the second hydraulic diode.

These and other features, advantages and effects as understood by the specialist, follow from the detailed description below of embodiments invented the I and the corresponding drawings, in which similar elements in different drawings have the same reference designators.

Brief description of drawings

Fig.1 shows a pictorial representation of a partial cross-sectional view of the downhole system that can be built on the basis of the principles of the present invention.

Fig.2 shows an enlarged pictorial representation of the cross-section of the downhole filter and system of regulation of the flow resistance, which can be used in the borehole system shown in Fig.1.

Fig.3A and 3B show a visual image of the "long" cross-sections along line 3-3 shown in Fig.2, one configuration of the system of regulation of the flow resistance.

Fig.4 shows a pictorial representation of another configuration of the control system for the flow resistance in transverse section.

Fig.5 shows a pictorial representation of the system of regulation of the flow resistance, is shown in Fig.4, in cross section along the line 5-5.

Fig.6A and 6B show a visual image of the system of regulation of the flow resistance, shown in Fig.4, in cross section, and shows the changes in the flow resistance depending on the characteristics of a multicomponent fluid.

The implementation of the invention

In Fig.1 shows an example of a well system 10, constructed on the OS is ove principles of the present invention. As shown in Fig.1, the barrel 12 bore has a generally vertical uncased portion 14, passing down from the casing 16, and mostly horizontal uncased portion 18 passing through the geological formation 20.

In the barrel 12 bore is mounted a tubular column 22 (type tubing columns). In the tubular column 22 in the mutual connection is multiple filters 24, systems 25 regulation of the flow resistance and packers 26.

Packers 26 seal the annular space 28 formed radially between the tubular column 22 and section 18 of the wellbore. When the fluid 30 can come from a variety of intervals or zones of the reservoir 20 through isolated between adjacent packers 26 part of the annular space 28.

Located between every two adjacent packers 26 downhole filter 24 and the system 25 of the regulation of the flow resistance are in mutual connection with the tubular column 22. In the wells of the filter 24 is filtered fluid 30 flowing in the tubular column 22 from the annular space 28. System 25 regulation of the flow resistance has a restrictive regulatory impact on the flow of the fluid 30 flowing in the tubular column 22, depending on the specific characteristics of fluids.

It should be noted that when the topic can be found in the drawings and described in this document wellbore system 10 is merely a specific example of multiple borehole systems, which can be applied the principles of the present invention. It should be clearly understood that the principles of the present invention is in no way limited to any features of the well system 10 or its elements shown in the drawings or described in this document.

For example, in the framework of the principles of this invention, the barrel 12 wells may not be mainly vertical part 14 or substantially horizontal portion 18, and the fluid 30 can not only be removed from the reservoir 20, but in other embodiments may be introduced into the reservoir, and can be introduced into the reservoir and be removed from the reservoir, and so on

Any downhole filter 24 and any system 25 regulation of the flow resistance can not be located between every two adjacent packers 26. Each individual system 25 regulation of the flow resistance may not be connected to a separate downhole filter 24. Can be used any number, any configuration and/or any combination of these elements.

Any system 25 regulation of the flow resistance can not be used with downhole filter 24. For example, when magnetically fluid it can flow through the system 25 of the regulation of the flow resistance, but may not flow through the downhole filter 24.

Uncased portion 14, 18 of the barrel 12 with the vazhiny may not contain the well screens 24, system 25 regulation of the flow resistance, the packers 26 and any other elements of the tubular column 22. According to the principles of the present invention, any portion of the barrel 12 bore may be casing or uncased, and any part of the tubular column 22 can be placed in the casing or uncased portion of the wellbore.

Thus, it should be clearly understood that this invention describes the creation and application of specific embodiments of the invention, but the principles of the present invention is not limited to any features of the options. On the contrary, the principles of the present invention may be embodied in many other ways, based on information contained in the present invention.

Professionals it is clear that the net effect is that you can regulate the flow of fluid 30 flowing in the tubular column 22 of each zone of the reservoir 20, for example to prevent the formation of a water cone 32 or gas cone 34. This method of flow control in the borehole can be used for the following purposes (but is not limited to these): efficient allocation of zones to extract (or discharge) of fluids, minimizing the removal or discharge of undesirable fluids, the marginal efficiency of extraction or injection of the desired fluid is in, etc.,

System options 25 regulation of the flow resistance, described in detail below, can ensure that these beneficial effects by increasing the flow resistance when exceeding a certain speed level of fluids (for example, to distribute the flow between zones, to prevent water or gas cones, and so on), by increasing the flow resistance in the fall of viscosity or density of the fluid below a certain level (for example, restrictions in the oil well flow of undesirable fluid, such as water or gas).

Used in this document the word "viscosity" (given its paradigm) characterize the rheological properties of the substance, including its kinematic viscosity, yield stress, viscoplasticity, surface tension, wetting ability and so on.

The desirability or undesirability of fluid is determined by the purpose of the operations performed by extraction or injection of fluid. For example, if the well is expected to extract the oil, but not water or gas, therefore, the oil is a desirable fluid, and water and gas - unwanted fluids. If wells are expected to be recovered gas and not water or oil, and therefore gas is a desirable fluid, and oil and water - unwanted fluids. If the reservoir is assumed nagne the AMB pairs, instead of water, therefore, steam is a desirable fluid, and water is undesirable fluid.

If the fluid is gas, the regulation of resistance to its flow by traditional methods can be a challenging task, when this usually applies throttling the gas flow. Unfortunately, the device may have a high volumetric rate due to leakage of gas instead of oil or other fluid, and the problem of erosion surfaces.

It should be noted that at certain levels of temperature and pressure in the borehole gaseous hydrocarbons may actually be in a fully or partially liquid phase. Thus, it should be understood that the use herein of the words "gas" and "gas" (with regard to their paradigms) in these concepts include condensate, supercritical, liquid and/or gaseous phase of a substance.

In the embodiment of the invention with reference to Fig.2, which shows an enlarged image of the cross-section of one of the systems 25 regulation of the flow resistance and part of one of the downhole filter 24, a multicomponent fluid 36 (which may include one or more fluids, such as oil and water, liquid water and water vapor, oil and gas, gas and water, oil, water and gas, etc.,) will SHS in the downhole filter 24, where is the filter, and then fed to the input 38 of the system 25 of the regulation of the flow resistance.

Multicomponent fluid may contain one or more desirable or undesirable fluids. Multicomponent fluid may contain water and water vapor. In another embodiment, the multicomponent fluid may contain oil, water and/or gas.

The flow of multicomponent fluid 36 through the system 25 of the regulation of the flow resistance is limited depending on one or more characteristics (such as density, viscosity, speed and others) multicomponent fluid. Then multicomponent fluid 36 is output from the system 25 of the regulation of the flow resistance inside the tubular column 22 through the outlet 40.

In other embodiments, in conjunction with system 25 control the flow resistance of the downhole filter 24 may not be used (for example, when the injection operations); multicomponent fluid 36 can flow through the various elements of the well system 10 in the opposite direction (for example, when the injection operations); together with many downhole filters can be used only regulation of the flow resistance; together with one or more downhole filters can be used several systems of regulation of the flow resistance; mnogokomponentnyi fluid can not be extracted from the annular space or tubular columns, and from other areas well and can do in the annular space or tubular column, and in other areas of the well; multicomponent fluid can flow through the regulatory system resistance to flow before reaching the downhole filter; downhole filter and/or control system in the flow resistance on the input side or the output can be in the mutual connection of other components; and so on, Thus, it is clear that the principles of the present invention in any way not limited to the features of the variant shown in Fig.2 and described in this document.

Although the downhole filter 24 shown in Fig.2, known in the art and is a filter with a wire winding, in other embodiments, filters can be applied to other types and their combinations (for example, sintered metal filter, expandable filter, air filter gasket, wire mesh and other). In addition, if necessary, can be used for additional components (housings, tubular bridges, cables, measuring tools, gauges, regulators, flow and so on).

In Fig.2 shows a simplified depiction of the system 25 of the regulation of the flow resistance, in this case, as described in detail below, in a preferred embodiment of the invention, the system can contain a variety of the channels and devices to perform different functions. In addition, the system 25 preferably takes place in the circumferential direction around the tubular column 22 or the system may be built into the wall of the tubular design, which is part of the tubular columns and are with her in the mutual connection.

In other embodiments, the system 25 may not take place in the circumferential direction around the tubular column or may not be embedded in the wall of the tubular design. For example, the system 25 may be formed in a flat design, and so on, the System 25 may be located in a separate envelope attached to the tubular column 22, or to have such an orientation in which the axis of the outlet 40 parallel to the axis of the tubular column. System 25 may be wireline or attached to the device with a tubular shape. The principles of the present invention can be embodied in any possible orientation or configuration of the system 25.

In Fig.3A and 3B provides a detailed image of the section of a variant of the system 25, which is shown as "deployed" on the plane in the circumferential direction.

As stated above, the multicomponent fluid 36 flows into the system 25 through the inlet 38 and flows out through the outlet 40. Resistance to the flow of multicomponent fluid flowing through the system 25, is adjusted depending on one or more characteristics of megacompanies the aqueous fluid.

The inlet 38 and the outlet 40 and the channel 42 and a flow-through chamber 44, through which from input to output flows of multicomponent fluid 36, are elements of the cyclone device 46, restricting the flow of multicomponent fluid, depending on certain characteristics of a multicomponent fluid. In the chamber 44 increases the intensity of the rotating flow of a multicomponent fluid 36, thereby increasing the resistance of the stream flowing through the chamber, for example by increasing the speed of a multicomponent fluid, decreasing the viscosity of multicomponent fluid, increasing the density of a multicomponent fluid and/or decrease of the share of the desired fluid to the proportion of unwanted fluid in a multicomponent fluid.

As shown in Fig.3A, the chamber 44 has a generally cylindrical shape, and the channel 42 connects with her on a tangent, with the fluid entering the chamber through the inlet 48, twists around exit 40 in a clockwise direction (see Fig.3A). The bifurcated channel 50 departs from the channel 42 downstream with respect to the input 38, while the bifurcated channel 50 communicates with the chamber 44 at a tangent. In turn, the fluid flowing into the chamber 44 through the inlet 52 branched channel 50, twists around exit 40 counterclockwise (see Fig.3A).

In Fig.3A shows that multicomponent what luid 36 at a relatively high speed and/or low viscosity enters the flow chamber 44 from the entrance 38 of the system through the channel 42. And Vice versa, as shown in Fig.3B, a multicomponent fluid 36 with a relatively low speed and/or high viscosity enters the chamber 44 through the channel 42.

As shown in Fig.3A, through the bifurcated channel 50 into the chamber 44 is supplied to only a small part of the multicomponent fluid 36. Thus, a significant part of the multicomponent fluid 36 is rotated in the chamber 44 in a spiral with increasing velocity as it moves to the exit 40. It should be noted that the intensity of rotation of the multicomponent fluid around 36 exit 40 increases with increasing speed or decreasing the viscosity of the multicomponent fluid entering through the inlet 38.

As shown in Fig.3B, a significantly higher percentage of multi-component fluid into the chamber 44 through the bifurcated channel 50. In this example, the flows into the chamber 44 through the inputs 48, 52, are almost identical. These threads are actually "prevent or counteract each other, which contributes a relatively small rotation of the flow of multicomponent fluid 36 in the chamber 44.

It is clear that, compared to the variant shown in Fig.3B, characterized in more direct flow path, at the same flow rate in the variant shown in Fig.3A, in a greater degree circular path of flow of the multicomponent fluid 36 is characterised races what jeevanam energy and therefore, great resistance to the flow of the multicomponent fluid. If desired the fluid is oil and the water and/or gas are undesirable fluids, it is clear that the system 25 of the regulation of the resistance to the flow shown in Fig.3A and 3B, has less resistance to the flow of multicomponent fluid 36, which is characterized by a high ratio of desired fluid to the proportion of unwanted fluid, and has a greater resistance to the flow of multicomponent fluid 36, which is characterized by a low ratio of desired fluid to the proportion of unwanted fluid.

The camera 44 is called "cyclone", because in this case she has a cylindrical shape with the outlet 40 located in its center, a multi-component fluid 36 (at least in Fig.3A) under the action of the pressure difference between the inlet 44 and outlet moves the camera in a spiral with increasing velocity as it approaches this output.

As shown in Fig.3A and 3B, in the chamber 44 for forming a circular flow used devices 54, designed to maintain circulation of the flow of multicomponent fluid around 36 exit 40, or at least to prevent the formation of a component stream of the multicomponent fluid inward, toward the exit, when the circulation flow mnogokomponentnoi what about the fluid around the outlet 40. The gap 56 in the devices 54 transmits a stream of the multicomponent fluid 36 inward, to the output 40.

As mentioned above, in Fig.3A shows the cyclone device 46, in which the flow of multicomponent stream 36 with increased speed and/or lower viscosity leads to the fact that a substantial part of the multicomponent fluid enters the chamber 44 through the inlet 48. This multicomponent fluid 36 in the chamber 44 moves in a spiral around the outlet 40, and the resistance of the stream flowing through the cyclone unit 46 increases. Multicomponent stream 36 can be characterized by a reduced viscosity due to the relatively small relationship of the proportion of the desired fluid to the proportion of unwanted fluid in a multicomponent fluid 36.

As shown in Fig.3A, through the inlet 52 into the chamber 44 receives a relatively small part of a multicomponent fluid 36, since the branch channel 50 from channel 42 a large part of the multicomponent fluid remains in the channel 42. At relatively high speeds, high densities and/or low viscosities of multi-component fluid 36 from the channel 50.

In Fig.3B shows that reducing a speed of a multicomponent fluid 36 and/or increase the viscosity of the multicomponent fluid from the channel 42 and the channel 50 to the input 52 runs a large share of the multicomponent fluid. Megacolon ntny flow can be characterized by a high viscosity due to the increase of the share of the desired fluid to the proportion of unwanted fluid in a multicomponent fluid.

As shown in Fig.3B, due to the fact that flows into the chamber 44 through the two inputs 48 and 52, are directed oppositely to each other (or at least the flow of multicomponent fluid entering through the inlet 52, is directed opposite to the flow entering through the inlet 48), they counteract each other. Thus, multicomponent stream 36 flows more directly to the outlet 40, and the resistance of the stream flowing through the cyclone device 46 is reduced, and the stream of the multicomponent fluid is characterized by low intensity of rotation (or lack thereof) around the outlet 40.

In Fig.4 depicts another configuration of the system 25 of the regulation of the flow resistance, in which the cyclone unit 46 connected in series with cyclone devices 58, 60. Although in Fig.4 shows three cyclone device 46, 58, 60, it is clear that according to the principles of the present invention, cyclone devices can be connected in series in any quantity.

The output 62 cyclone device 46 corresponds to the input cyclone device 58, and the output 64 cyclone device 58 corresponds to the input cyclone device 60. Multicomponent fluid 36 flows through the inlet 38 of the system 25 into the chamber 44, and then flows from the chamber 44 through the output/input 62 in the cyclone device 58 and passes through o is d/input 62 in the cyclone chamber 66 cyclone device 58, further from the camera 66 he goes through the exit/entrance 64 in the cyclone device 60 and falls through the exit/entrance 64 in the cyclone chamber 68 cyclone device 60, and then from the chamber 68 flows to the output 40 of the system 25.

Each cyclone devices 58, 60 includes two channels 70, 72 and 74, 76, respectively, which are similar to the functions of the channels 42, 50 cyclone device 46. The share of multi-component fluid 36 flowing through each of the channels 70, 72 and 74, 76, vary depending on the rotation of the multicomponent fluid at the inlet into the corresponding cyclone device 58, 60. This process is described in detail below.

In Fig.5 illustrates the system 25 of the regulation of the flow resistance in the cross section along the line 5-5 shown in Fig.4. This drawing illustrates how the hydraulic communication between the cyclone devices 46, 58, 60 through the output/input 62 and output/input 64.

In Fig.5 also shows a compact "stack" accommodation cyclone devices 46, 58, 60, at which these devices alternately deployed towards each other. It is obvious that according to the principles of the present invention, the cyclone device 46, 58, 60 may be located otherwise.

In Fig.6A and 6B shows the system 25 of the regulation of the flow resistance, is shown in Fig.4 and 5, and in Fig.6A p the pot multicomponent fluid 36 with a relatively low viscosity, high density and/or high speed flowing through the system, and Fig.6B shows a multicomponent fluid 36 with a relatively high viscosity, low density and/or low speed flowing through the system. These examples illustrate the nature of changes in the flow resistance through the system 25 according to the specific characteristics of a multicomponent fluid 36.

In Fig.6A shows that in the cyclone device 44 has a substantially spiral flow of multicomponent fluid 36 (similar to above with reference to Fig.3A). As a result, when the output from the camera 44 and injected into the cyclone device 58 via the input/output 62 multicomponent fluid 36 in substantially twisted.

Thus the rotation of the flow of multicomponent fluid 36 facilitates the flow of a bigger share of the multi-component fluid through the channel 70, compared with a share of multicomponent fluid flowing through the channel 72. The difference in fractions of a multicomponent fluid flowing through each of these channels is caused by the nature of crowding rotating multi-component fluid 36 on the curved walls of the channels 70, 72 at the point of intersection with the exit/entrance 62.

Since a large share of the multicomponent fluid 36 into the chamber 66 cyclone device 58 through the channel 70, multicomponent fluid is crucified in the chamber 66 is like a spiral flow of multicomponent fluid through the chamber 44 cyclone device 46. This spiral flow of multicomponent fluid 36 through the chamber 66 has a resistance to flow, with an increase of the rotating component of the multicomponent flow of fluid in the chamber, the flow resistance increases.

At the exit from the chamber 66 through the output/input 64 multicomponent fluid rotates. Thus the rotation of the flow of multicomponent fluid 36 facilitates the flow of a bigger share of the multi-component fluid through the channel 74 in comparison with the share of multicomponent fluid flowing through the channel 76. Similarly to the above description for the cyclone chamber 58, the difference in fractions of a multicomponent fluid flowing through each of these channels is caused by the nature of crowding rotating multi-component fluid 36 on the curved walls of the channels 74, 76 at the point of intersection with the exit/entrance 64.

Since a large share of the multicomponent fluid 36 into the chamber 68 cyclone device 60 through the channel 74, multicomponent fluid is twisted in the chamber 68 is like a spiral flow of multicomponent fluid through the chamber 66 cyclone device 58. This spiral flow of multicomponent fluid 36 through the chamber 68 has a flow resistance, with an increase of the rotating component of the multicomponent flow of fluid in the chamber, the flow resistance increases is raised.

Thus, as shown in Fig.6A, during the flow of multicomponent fluid 36 at a relatively high speed and/or low viscosity intensity of rotation of the flow and the flow resistance increases in each of the cyclone device 46, 58, 60, while the total flow resistance is significantly greater than the resistance provided by only one cyclone device 46. In addition, the rotating flow through the chambers 66, 68 cyclone devices 58, 60 is caused by the rotating flow of a multicomponent fluid 36 at each of the outputs/inputs 62, 64.

In Fig.6B it is shown that through the system 25 flows of multicomponent fluid 36 with a relatively high viscosity and/or low speed. It should be noted that the intensity of the rotational flow of a multicomponent fluid 36 in each of the chambers 44, 66, 68 is significantly reduced, and ,thus, significantly reduces the resistance to the flow of multicomponent fluid 36 through these cameras. Thus, the resistance to the flow of multicomponent fluid 36 with a relatively high viscosity and/or low speed, illustrated in Fig.6B, much less resistance to the flow of multicomponent fluid with a relatively low viscosity and/or high speed, illustrated in Fig.6A.

It should be noted that any sign of any of the config of the radios above system 25 may be included in any other configuration of this system, and thus, it should be understood that these signs are not specific to any particular configuration of the specified system. The system 25 can be used in the borehole system of any type (for example, not only in the well system 10) and have different purposes in varied aspects of the life of the well, including (but not limited to those) injection, productivity improvement, completion, matching operational parameters, drilling and so on.

It is clear that the system 25, illustrated in Fig.4-6B, provides a dramatic improvement over the prior art in the field of flow control in the well. Resistance to the flow of multicomponent fluid 36 flowing through the system 25 can be substantially increased by the serial connection of cyclone devices 46, 58, 60 and limit the flow of multicomponent fluid due to its rotation during the flow from one cyclone device to another.

The foregoing description of the disclosed system 25 regulation of the flow resistance for use in a subterranean well. System 25 may include a cyclone device 58 or 60, through which flows of multicomponent fluid 36. Resistance multicomponent stream 36 flowing through the cyclone device 58 or 60, depends on the rotation megacomponents the second fluid 36 at the inlet 62 or 64 cyclone device 58 or 60.

Resistance to the flow of multicomponent fluid 36 through the cyclone device 58 or 60 may be increased by increasing the intensity of rotation of the multicomponent fluid 36 at the inlet 62 or 64 cyclone device 58 or 60.

The intensity of rotation of the multicomponent fluid 36 at the inlet 62 or 64 can be increased by lowering the viscosity of the multicomponent fluid 36.

The intensity of rotation of the multicomponent fluid 36 at the inlet 62 or 64 can be increased by increasing the speed of multicomponent fluid 36.

The intensity of rotation of the multicomponent fluid 36 at the inlet 62 or 64 can be increased by the decrease of the ratio of the share of the desired fluid to the proportion of unwanted fluid multicomponent fluid 36.

The output 64 of one cyclone device 58 may be input 64 of another cyclone device 60. The input 64 of one cyclone device 60 may be output 64 of another cyclone device 58.

Cyclone device 58 may include at least first and second channels 70, 72, through which flows of multicomponent fluid 36 flowing through the output 62 of another cyclone device 46. The difference in fractions of a multicomponent fluid 36 flowing respectively through the first and second channels 70, 72, depends on the rotation of the multicomponent fluid 36 at the output 62. The difference in fractions of multicomponent fluorescence is IDA 36, flowing through the first and second channels 70, 72, may be increased by increasing the speed of multicomponent fluid 36.

The intensity of rotation of the multicomponent fluid 36 in the cyclone chamber 66 increases with the difference in fractions of a multicomponent fluid 36 flowing through the first and second channels 70, 72.

The above also describes the system 25 of the regulation of the flow resistance, which may include a first cyclone device 46 with the outlet 62, and the second cyclone device 58, in which the output 62 of the first cyclone device 46 receives a multicomponent fluid 36. Resistance to the flow of multicomponent fluid 36 through the second cyclone device 58 may depend on the rotation of the multicomponent fluid 36 at the output 62 of the first cyclone device 46.

The intensity of rotation of the multicomponent fluid 36 at the output 62 can be increased by lowering the viscosity of the multicomponent fluid 36, by increasing the speed of multicomponent fluid 36 and/or decrease of the share of the desired fluid to the proportion of unwanted fluid in a multicomponent fluid 36.

Resistance to the flow of multicomponent fluid 36 through the second cyclone device 58 can be increased by increasing the intensity of rotation of the multicomponent fluid 36 at the output 62 of the first cyclone device 46

The output 64 of the second cyclone device 58 may be input 64 of the third cyclone device 60.

The second cyclone device 58 may include at least first and second channels 70, 72, through which flows of multicomponent fluid 36 flowing through the output 62 of the first cyclone device 46. The difference in fractions of a multicomponent fluid 36 flowing respectively through the first and second channels 70, 72, depends on the rotation of the multicomponent fluid 36 at the output 62 of the first cyclone device 46.

The difference in fractions of a multicomponent fluid 36 flowing through the first and second channels 70, 72, may be increased by increasing the speed of multicomponent fluid 36.

The intensity of rotation of the multicomponent fluid 36 in the cyclone chamber 66 of the second cyclone device 58 can be increased by increasing the difference in fractions of a multicomponent fluid 36 flowing through the first and second channels 70, 72.

In the above description discloses a system 25 regulation of the flow resistance, which may include a first cyclone device 46, contributing to the increase in the intensity of rotation of the multicomponent fluid 36 at the output 62 of the first cyclone device 46 by increasing the speed of multicomponent fluid 36, and the second cyclone device 58, which receives megacompanies the hydrated fluid 36 from the output 62 of the first cyclone device 46. Resistance to the flow of multicomponent fluid 36 through the second cyclone device 58 may depend on the rotation of the multicomponent fluid 36 at the output 62 of the first cyclone device 46.

It should be noted that the cyclone device 46, 58, 60 may be known to specialists devices, called hydraulic "diodes".

The downhole device (for example, 25 of the regulation of the flow resistance) for installation in the barrel 12 bore in an underground area (such as in geological layer 20) may include a first hydraulic diode (for example, cyclone device 46)having a first inner surface 80 (see Fig.4 and 5), limiting the first internal chamber 44, and the output 62 of the first inner chamber 44, and the first inner surface 80 facilitates twisting of the fluid (for example, a multicomponent fluid 36) in the direction of its output 62; and a second hydraulic diode (for example, cyclone device 58)having a second inner surface 82, limiting the second internal chamber 66, which is in hydraulic communication with the outlet 62, and a second inner surface 82 facilitates the rotation of the fluid (for example, a multicomponent fluid 36) upon receipt of a rotating fluid through the outlet 62.

The second hydraulic diode can be input (Fig.A-6B camera input 58 sovada the t with the output 62 of the chamber 44), through which flows the fluid 36 directly from the output 62. The second inner chamber 66 may contain cylindrical chamber 66, the first channel 70 extends from the inlet 62 to cylindrically camera 66, the second channel 72 extends from the inlet 62 to cylindrically camera 66.

The second inner surface 82 may be intended for the direction of the greater part of the fluid 36 through the first channel 70 for receiving a rotating fluid 36 through the inlet 62.

The first inner surface 80 may facilitate the twisting of the fluid 36 around the first axis 84 of rotation, and the second inner surface 82 may facilitate the twisting of the fluid 36 around the second axis 86 of rotation. The first axis 84 of rotation may be parallel to the second axis 86 of rotation.

The first hydraulic diode 46 and the second hydraulic diode 58 can provide hydraulic message internal space of the downhole devices (e.g., system 25 regulation of the flow resistance) with its outer space. The first hydraulic diode 46 and the second hydraulic diode 58 can provide hydraulic message internal space of the downhole device 25 with its outer space to transmit the extracted fluid 36 from that of the external space into the interior of the downhole device 25. The downhole device 25 can in order to contain a portion of the column 22 completions.

The first and second hydraulic diodes 46, 58 can provide hydraulic message internal space of the downhole device with its outer space to transmit the pressurized fluid 36 from the interior of the downhole device 25 in its outer space. The downhole device 25 can contain a portion of the production string 22.

The output 62 may constitute a first output 62, the first hydraulic diode 46 may further have a first input 38, the first inner surface 80 may include a first side surface 80 and the first opposite end surface 88, the greatest distance between the first opposite end surfaces 88 may be less than the greatest length of the first opposite end surfaces 88, and the first side surface 80 may be designed to twist flow coming from the first input 38, around the first outlet 62.

The second hydraulic diode 58 may have a second input 62 to which the fluid 36 can flow directly from the first output 62, the second inner surface 82 may include a second side surface 82 and second opposite end surface 90, the greatest distance between the second opposite end surfaces 88 may be less than the maximum prot the debts second opposite end surfaces 90, and the second side surface 82 may be designed to twist flow coming from the second input 62, around the second outlet 64.

The method of flow control in the barrel 12 wells in the underground area 20 may include transfer fluid 36 through the first hydraulic diode 46 and the second hydraulic diode 58 through the channel between the inner space of the downhole device 25 and its outer space in the underground area 20. When the transmission fluid 36 through the first hydraulic diode 46 and the second hydraulic diode 58 may be provided for tightening the fluid 36 in the first hydraulic diode 46 and can be provided by the twisting of the fluid 36 in the second hydraulic diode 58.

The fluid 36 may be an extracted or injected fluid.

When the transmission fluid 36 through the first hydraulic diode 46 and through the second hydraulic diode 58 may be provided for regulating the flow resistance of the fluid 36 between the inner space of the downhole device and its outer space depending on the characteristics of the flow. The flow characteristics may be at least viscosity, speed or density.

The resistance to flow through the second hydraulic diode 58 may at least partially be related to the characteristics of the incoming flow to the second hydraulic died from the first hydraulic diode 46.

It should be understood that various variants described above can have various spatial orientation, including an inclined, inverted, horizontal, vertical, etc., and be used in different configurations without deviating from the essence of the present invention. Embodiments of the invention shown in the drawings, shown and described only as examples of practical application of the principles of the present invention are not limited to any specific features of these embodiments of the invention.

Of course, based on a thorough acquaintance with the above description of embodiments of the invention the expert it is clear that the individual components of the data specific embodiments of the invention may be modified, supplemented, replaced, eliminated, and in these specific embodiments of the invention may be made other changes within the principles of the present invention. Accordingly, the above description is used as an example and is intended for a clearer understanding of the invention, and the nature and scope of the present invention confined solely by the features indicated in the claims, and equivalent signs.

1. The downhole device is in for installation in a wellbore in a subterranean zone, containing the first hydraulic diode having a first inner surface bounding a first internal chamber, and output the first internal chamber, the first inner surface facilitates twisting of the fluid in the direction of its output; and a second hydraulic diode having a second inner surface bounding a second internal chamber being in hydraulic communication with the specified output, and a second inner surface facilitates twisting of the fluid when the flow of a rotating fluid through the specified output.

2. The device under item 1, characterized in that the second hydraulic diode has an inlet through which fluid is supplied directly from the output, and the second internal chamber contains cylindrical chamber, the first channel extending from the inlet cylindrically camera, and a second channel extending from the inlet cylindrically camera.

3. The device according to p. 2, characterized in that the second inner surface contributes to the greater part of the fluid to the first channel when the input rotating fluid.

4. The device under item 1, characterized in that the first inner surface facilitates twisting of the fluid around the first rotation axis, and the second inner surface facilitates twisting of the fluid around the second axis of rotation is possible.

5. The device according to p. 4, characterized in that the first axis of rotation parallel to the second axis of rotation.

6. The device under item 1, characterized in that the first hydraulic diode and the second hydraulic diode provide a hydraulic message internal space of the downhole device with its outer space.

7. The device according to p. 6, characterized in that the first hydraulic diode and the second hydraulic diode provide a hydraulic message internal space of the downhole device with its outer space to transmit the extracted fluid from that of the external space into the interior of the downhole device.

8. The device according to p. 7, characterized in that it contains the part of the column of completion.

9. The device according to p. 6, characterized in that the first and second hydraulic diodes provide a hydraulic message internal space of the downhole device with its outer space to transfer pressurized fluid from the interior of the downhole device in its outer space.

10. The device according to p. 4, characterized in that it contains a portion of the production string.

11. The device under item 1, characterized in that the output is a first output, the first hydraulic diode has a first input, the first inner surface of the includes a first side surface and opposite the first end surface, the greatest distance between the first opposite end surfaces is less than the greatest length of the first opposite end surfaces, and the first side surface is intended for tightening the flow coming from the first entrance, around the first exit.

12. The device according to p. 11, characterized in that the second hydraulic diode has a second input to which the fluid flows directly from the first output, the second inner surface includes a second side surface and second opposite end surfaces, with the greatest distance between the second opposite end surfaces is less than the greatest length of the second opposite end surfaces and the second side surface is intended for tightening the stream coming from the second. the entrance, around the second output.

13. Method for controlling flow in a well bore in a subterranean zone, which convey the fluid through the first hydraulic diode and the second hydraulic diode channel between the inner space of the downhole device and its outer space in the underground area, and when the transmission fluid through the first hydraulic diode and the second hydraulic diode provide the twisting of the fluid in the first hydraulic diode and twisting of the fluid in the second hydraulic diode.

14. The method according to p. 13, wherein the fluid is an extracted fluid.

15. The method according to p. 13, wherein the fluid is a pressurized fluid.

16. The method according to p. 13, characterized in that the transfer of fluid through the first hydraulic diode and through the second hydraulic diode regulate the flow resistance of the fluid between the inner space of the downhole device and its outer space depending on the flow characteristics.

17. The method according to p. 16, wherein the characteristic of the flow is at least the strength, speed or density.

18. The method according to p. 16, characterized in that the resistance to flow through the second hydraulic diode is at least partially due to the characteristics of the incoming flow to the second hydraulic diode from the first hydraulic diode.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to mining engineering and may be used for regulation of fluid inflow to the well. The system contains a flowing chamber through which a multicomponent fluid passes, at that this chamber contains at least one input, one output and at least one structure spirally located in regard to the output and thus facilitating helical swirling of the multicomponent fluid flow around the output. According to another version the system contains a flowing chamber with the output, at least one structure facilitating helical swirling of the multicomponent fluid flow around the output and at least one structure preventing redirection of the multicomponent fluid flow to radial trajectory passing towards the output.

EFFECT: prevention of gas cone and/or water cone formation around the well.

24 cl, 5 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to control over flow resistance in the well. Proposed device has the surface making the chamber and including lateral and opposite end surfaces. Note here that maximum distance between opposite end surfaces is smaller than maximum length of opposite end surfaces. It has first opening in one of end surfaces and second opening in said surface, isolated from first opening. Note here that lateral surface serves to swirl the flow from second opening to circulate around first opening.

EFFECT: higher efficiency of in-well fluid resistance adjustment.

27 cl, 11 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the first alternative a flow resistance control system includes a cyclone through which multicomponent fluid flows and the cyclone input is coupled to the cyclone chamber with at least two channels. Flow resistance of the multicomponent fluid passing through the cyclone depends on rotational intensity of the multicomponent fluid at the cyclone input. According to the second alternative a flow resistance control system includes the first cyclone with input and the second cyclone receiving the multicomponent fluid from the first cyclone input through the input coupled to a cyclone chamber with at least two channels. Flow resistance of the multicomponent fluid passing through the second cyclone depends on rotational intensity of the multicomponent fluid at the first cyclone input.

EFFECT: effective control of fluids flow.

10 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes pumping and flushing of the polymer solution and well shutdown for the period of polymer gelling. According to the invention geophysical survey is made in order to specify the interval of water influx. Computational experiments are made on the basis of water influx isolation and limitation mathematical model thus evaluating stability of polymer screens for different viscosity and volume of polymer solutions in oil- and water-bearing areas of the productive stratum at the limit depression and depression in service, residual water and oil resistance factors for injected polymer solutions considering type of the productive stratum as well as water cut of the produced oil and its flow rate after insulation and limitation of water influx. At that viscosity of polymer solutions are evaluated in time at temperature of the productive stratum. Then the polymer is selected with required viscosity and volume of injection ensuring stability of the screen based on the above polymer in oil-bearing area of the productive stratum. The selected polymer solution is injected in the calculated volume.

EFFECT: increased efficiency of the method.

2 cl, 4 dwg, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: operation method for a well placed in oil-water contact zone contains the stages at which the well is perforated in the oil-containing area of the stratum and water-containing area of the stratum; dual product extraction is arranged from the oil-containing area and water-containing area of the stratum through the above perforation with the controlled rate; at that well production rate is controlled and equipment is selected for production on the basis of the certain ratio and periodically changed physical and chemical and reservoir properties.

EFFECT: improvement of efficiency and reliability for operation of wells placed in the oil-water contact zone.

3 cl, 3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: in compliance with this method, well is shut in to open casing and linear gate valves for pumping highly mineralised water into annular space. Casing valve is closed to release excess pressure for pumping of highly mineralised water into seam in preset amount at 7.5-10.0 MPa. Pumping is stopped to close the well and to level the pressure for uniform distribution of highly mineralised water in the seam water-flooded zone. Well is started to run it to constant duty for up to 5 days. Well is operated at seam depression of 0.5-1.5 MPa. Volume of injected highly mineralised water is defined by analytical expression.

EFFECT: higher efficiency.

1 ex

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling of a deposit with production wells crossing a formation consisting of a water-saturated zone separated with a non-permeable natural interlayer with an oil-saturated zone, lowering of a casing string with further formation perforation, investigation of its water-oil saturation and their deposit intervals, dimensions of non-permeable natural interlayer, creation of a screen from an insulating compound, which separates water-saturated zone of the formation from oil-saturated zone, cutting of some part of the casing string, enlarging the well shaft at that interval; filling of the enlarged interval of the well shaft with insulating compound, drilling of insulating compound after the insulating compound hardening. At arrangement of water-saturated zone below oil-saturated zone of the formation and at thickness of the non-permeable natural interlayer of more than 3 m, some part of the casing string is cut from the internal of 1.5 m below the roof of the non-permeable natural interlayer and up to the interval of 1.5 m above the bottom of the water-saturated zone of the formation. The well shaft is enlarged at each interval. A setup consisting of a shank and a hydraulic disconnector is assembled on the well head in an upward direction. The shank is made in the form of pipes with outer diameter of less than inner diameter of the casing string. A check valve is installed on the lower end of the shank with possibility of its opening or closing under action of excess pressure, and a filter is installed below it. The shank length of chosen with the size of not less than distance from the mine face up to the interval of 1.5 m below the roof of non-permeable natural interlayer. The assembled setup on the filling pipe string is lowered to the well till the lower end of the shank is borne against the mine face. A hydraulic disconnector is actuated; after that, the filling pipe string is raised to the height of 1 m and lowered; then, an insulating compound is pumped via the pipe string and the shank and the insulating compound is forced through by pumping of forcing-through liquid to the pipe string through the check valve opened under action of excess pressure and the filter of the shank to tubular annulus and brought to the shank head. The filling pipe string with the hydraulic disconnector is removed from the well and the insulating compound is left till it is cured. Microcement is used as an insulating compound. After the insulating compound is cured, drilling of the insulating compound and the check valve is performed, and drill products are removed from the shank by flushing.

EFFECT: improving development efficiency owing to excluding behind-the-casing flows; reducing labour intensity and duration of the method.

6 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling of a deposit with production wells crossing a formation consisting of a water-saturated zone separated with a non-permeable natural interlayer with an oil-saturated zone, lowering of a casing string with further formation perforation, investigation of its water-oil saturation and their deposit intervals, dimensions of non-permeable natural interlayer, creation of a screen from an insulating compound, which separates water-saturated zone of the formation from oil-saturated zone, cutting of some part of the casing string, enlarging the well shaft at that interval; filling of the enlarged interval of the well shaft with insulating compound, drilling of insulating compound after the insulating compound hardening. At arrangement of a water-saturated zone below the oil-saturated zone of the formation and thickness of the non-permeable natural interlayer of less than 3 m there cut is some part of the casing string from the bottom of the non-permeable natural interlayer to the roof of the oil-saturated zone of the formation, and the well shaft at that interval is enlarged. After that, a setup consisting of a cutter with teeth and holes, a shank and an attachment assembly is assembled on the well head in an upward direction. With that, the shank is made in the form of pipe with the diameter that is smaller than the casing string diameter. A check valve is installed on the lower shank end. The shank length is chosen so that it is equal to distance from the mine face to roof of the oil-saturated zone of formation plus two metres. The assembled setup is connected by means of a left-hand adapter to a filling pipe string and lowered to the casing string of the well till the cutter teeth are borne against the mine face. Cutter teeth are directed to the side opposite to rotation direction of the filling pipe string at detachment of the filling pipe string from the shank. Rotation of the filling pipe string is performed from the well head in a clockwise direction through 8-10 revolutions and detachment of the filing pipe string from the shank is performed. The filling pipe string is raised by 1.5 m; insulating compound is pumped to the filling pipe string and pumped with forcing-through liquid to the tubular annulus; brought to the shank head; the filling pipe string with the left-hand adapter and the attachment assembly is removed from the well, and the insulating compound is left till it is cured. Microcement is used as an insulating compound. After microcement is cured, drilling of the check valve is performed from the inner space of the shank and excess microcement is removed from the shank. Then, the well is brought into development as a production well for extraction of the product from the oil-saturated zone of the formation or as an injection well for pumping of liquid to the water-saturated zone of formation.

EFFECT: improving development efficiency owing to excluding behind-the-casing flows; reducing labour intensity and duration of the method.

6 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: casing is sunk into well to perforate the bed. Oil and water saturation intervals and impermeable seam sizes are analysed. Casing part is cut out to expand the borehole in said interval. Fluid is injected in string for packer to define the bed specific capacity. Fluid circulation is defined by injecting fluid via casing string-borehole annulus. In case circulation exists, isolation composition is injected to produce isolation bridge inside casing string 20-30 m above perforation interval. In case circulation does not exist, isolation composition is discharged via casing string-borehole annulus to interval of perforation of oil-and water saturated bed zone to fill expanded bore expanded interval with isolation composition. After hardening of isolation composition, isolation composition is drilled to produce the shield opposite said saturated zone. Isolation quality is analysed. Bed perforation is repeated to resume its development.

EFFECT: lower labour input, accelerated process, higher isolation quality.

7 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling of a deposit with production wells crossing the formation with water-saturated and oil-saturated zones separated with a non-permeable natural interlayer, lowering of a casing string with further formation perforation, investigation of its water-oil saturation and their deposit intervals, dimensions of non-permeable natural interlayer, creation of a screen from an insulating compound, which separates water-saturated zone of the formation from oil-saturated zone, cutting of some part of the casing string, enlarging the well shaft at that interval; filling of the enlarged interval of the well shaft with insulating compound, drilling of insulating compound in the well so that the screen remains opposite to oil-saturated zone of the formation after waiting period of the insulating compound curing, perforation opposite to oil-saturated zone of the formation, and development of the well. At arrangement of non-permeable natural interlayer below oil-saturated zone of formation and thickness of non-permeable natural interlayer over 8 m at the bottom interval of non-permeable natural interlayer there installed is a blind packer, and temporary clogging of oil-saturated zone of formation is performed. Some part of the casing string is cut out to 1.0-1.5 m at height of 1.0 m above bottom of non-permeable natural interlayer, and in casing string interval at height 1.0-1.5 m below roof of non-permeable natural interlayer there made are holes across the casing string. Cementing casing string is lowered to well with through drillable packer, packer is installed in casing string opposite to non-permeable natural interlayer in interval between cut out part and holes in casing string, circulation of fresh water is induced on well head along cementing casing string under packer via casing string annulus and intertube space on well head by pumping of fresh water. If there is no fresh water circulation, impulse treatment of non-permeable natural interlayer by mud acid composition is performed. When circulation is available pumping of fresh water is stopped, then insulating compound is pumped via grout casing string and is forced into casing string annulus in interval of non-permeable natural interlayer with formation of insulating bridge in inner space of casing string to the bottom of oil-saturated zone of the formation. Then grout casing string is lifted above the bottom of oil-saturated zone of the formation and surpluses of synthetic resin are washed out from intertube space of casing string. After some period required for synthetic resin curing through and blind packers are drilled as well as insulating bridge, temporary clogging of formation is removed and well is brought into operation.

EFFECT: improving efficiency of the method owing to excluding behind-the-casing flow in the well between water- and oil-saturated zones of the formation and possibility of their simultaneous-separate development.

2 ex, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to mining engineering and may be used for regulation of fluid inflow to the well. The system contains a flowing chamber through which a multicomponent fluid passes, at that this chamber contains at least one input, one output and at least one structure spirally located in regard to the output and thus facilitating helical swirling of the multicomponent fluid flow around the output. According to another version the system contains a flowing chamber with the output, at least one structure facilitating helical swirling of the multicomponent fluid flow around the output and at least one structure preventing redirection of the multicomponent fluid flow to radial trajectory passing towards the output.

EFFECT: prevention of gas cone and/or water cone formation around the well.

24 cl, 5 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to control over flow resistance in the well. Proposed device has the surface making the chamber and including lateral and opposite end surfaces. Note here that maximum distance between opposite end surfaces is smaller than maximum length of opposite end surfaces. It has first opening in one of end surfaces and second opening in said surface, isolated from first opening. Note here that lateral surface serves to swirl the flow from second opening to circulate around first opening.

EFFECT: higher efficiency of in-well fluid resistance adjustment.

27 cl, 11 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the first alternative a flow resistance control system includes a cyclone through which multicomponent fluid flows and the cyclone input is coupled to the cyclone chamber with at least two channels. Flow resistance of the multicomponent fluid passing through the cyclone depends on rotational intensity of the multicomponent fluid at the cyclone input. According to the second alternative a flow resistance control system includes the first cyclone with input and the second cyclone receiving the multicomponent fluid from the first cyclone input through the input coupled to a cyclone chamber with at least two channels. Flow resistance of the multicomponent fluid passing through the second cyclone depends on rotational intensity of the multicomponent fluid at the first cyclone input.

EFFECT: effective control of fluids flow.

10 cl, 6 dwg

FIELD: mining.

SUBSTANCE: group of inventions relates to mining and can be used for finishing, preparing and/or operation of the well bore. The device comprises a tubular housing defining an internal channel, one or more injection inflow regulators and one or more operational inflow regulators. One or more injection inflow regulators may comprise one or more first back-flow valves in fluid communication with the internal channel. And each first back-flow valve provides flowing of fluid through it from the inner channel to the wellbore area and substantially blocking the reverse flow of fluid through it. One or more operational inflow regulators may comprise one or more second back-flow valves connected to the tubular housing. And each second back-flow valve provides flowing of fluid through it from the wellbore into the inner channel and substantially prevents the reverse flow of fluid through it.

EFFECT: technical result is to increase the efficiency of finishing of a well drilled with large vertical deviation.

22 cl, 10 dwg

FIELD: mining.

SUBSTANCE: group of inventions relates to mining and can be used for the fluid flow control in the wellbore. The method comprises providing a hydraulic diode in the channel of hydraulic communication with the wellbore and the displacement of fluid through the hydraulic diode. At that the hydraulic diode is located inside the wellbore. The tool comprises a tubular diode sleeve having a diode opening, a tubular intrachannel sleeve mounted concentrically in the diode sleeve, and the intrachannel sleeve comprises an inner passage which is in hydraulic communication with the diode opening, and a tubular external channel sleeve inside which the diode sleeve is concentrically mounted. Moreover the external channel sleeve comprises an outer channel which is in hydraulic communication with the diode opening. And, in this tool the shape of the diode opening, the position of the inner channel relative to the diode opening and the position of the outer channel relative to the diode opening determine the resistance to the flow of the fluid flowing into the inner channel from the outer channel, and the other resistance to the flow of the fluid flowing into the inner channel from the outer channel.

EFFECT: increase of the efficiency of controlling the fluid flow in the wellbore.

19 cl, 13 dwg

Downhole device // 2529310

FIELD: oil-and-gas industry.

SUBSTANCE: proposed plant comprises tubing, one packer, electric cable and one or several shutoff-bypass devices. Additionally, its comprises control device arranged at well mouth and at least one downhole motor secured at said tubing and connected with shutoff-bypass device and, via electric cable, with control device. Besides, this plant comprises actuator composed of plunger pair or piston pair with functions of hydraulic pressure pump with hydraulic pressure channel connecting said downhole motor with shutoff-bypass device, or hydraulic actuator composed of hydraulic pressure pump with hydraulic pressure channel.

EFFECT: optimised and high reliability of operation.

15 cl, 14 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves opening of strata by injectors and producers, injection of working fluid and recovery of the product. The section is selected where at least 20 thousand t of remaining reserves are available for each producer, an injector is selected with three perforated strata, to the lower stratum with the biggest permeability injection of working fluid is limited up to minimum values of 40 m3/day as the most, unlimited, as maximum as possible injection of the working fluid is done to other strata. The injector is operated in this mode, status of producers in the second stratum is analysed; when bottomhole pressure increases per 10-15% and water cut increases per 40% in the nearest producer of the second stratum, intensification of the operation mode is made for the producer. When bottomhole pressure increases per 10-15% and water cut increases per 40% in the nearest producer of the second stratum complete or partial limitation of injection is done for the second stratum. Control is carried out over bottomhole pressure in the area of complete or partial limitation of injection for the lowest and the most permeable stratum, and when decrease in bottomehole pressure per 10-15% below saturation pressure is confirmed injection volumes are increased in order to prevent decrease in oil recovery volume. Limitation of injection to the most permeable stratum and status analysis of the producers in the second stratum are repeated periodically.

EFFECT: improving oil recovery of the deposit.

2 ex

FIELD: oil and gas industry.

SUBSTANCE: operation method for a well placed in oil-water contact zone contains the stages at which the well is perforated in the oil-containing area of the stratum and water-containing area of the stratum; dual product extraction is arranged from the oil-containing area and water-containing area of the stratum through the above perforation with the controlled rate; at that well production rate is controlled and equipment is selected for production on the basis of the certain ratio and periodically changed physical and chemical and reservoir properties.

EFFECT: improvement of efficiency and reliability for operation of wells placed in the oil-water contact zone.

3 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes determination of an average distance between fractures, division of the horizontal hole in sections by packers, running in of devices for water influx control at the tubing string to the horizontal hole, product withdrawal from the horizontal well. At that the horizontal hole is divided by water-swellable packers into sections with length of each section from 20 m up to 50 m depending on the distance between fractures and length of the horizontal hole. The devices for water influx control in the horizontal hole have openings in walls with diameter d, which is comparable to the size of oil capillary tubes for this reservoir and the openings are made of water-repellent material. Length of each device for water influx control is from 5 m up to 12 m, and total number of devices does not exceed 5 pieces between packers in each section, total number of the openings N in devices for water influx control in the whole horizontal hole, depression and diameter d of the openings is determined by the ratio. Product from the well is produced provided that hydrodynamic forces created by bottomhole pressure do not exceed capillary forces of oil movement through openings in the devices for water influx control, i.e. depression in the well meets the above ratio.

EFFECT: increase in oil recovery factor.

1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: in compliance with one of versions, this device comprises well with packers dividing the well into two or more spaces communicated with productive formations, downhole pump and valve system to be connected to pump inlet in one or several formations. Shank is arranged under packers and connected with tubing while opening for communication with the pump nearby interpacker space is located at maximum distance from packets but not lower than the rood of formation communicated therewith.

EFFECT: higher efficiency.

3 cl, 3 dwg

FIELD: mining industry.

SUBSTANCE: invention can be used in case of gas-lift operation of wells equipped by free piston-type installations. Invention envisages stopping well, connecting tube space and annular space in wellhead, recording bottom zone and wellhead pressures in tube and annular spaces, and computing well operation parameters using inflow curve plotted according to differences of bottom zone and wellhead pressures. Volume of produced fluid is found from potential output of formation and from condition of output of free piston. When comparing these volumes, parameters of well are computed in the base of minimum volume value.

EFFECT: optimized well operation.

2 dwg

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