Flow restriction control system for use in subsurface well

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

 

The technical field to which the invention relates.

The present invention generally relates to methods and equipment used in the technological processes associated with operation of groundwater wells, and as described below option in particular to adjustable flow limiter.

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 production, the efficient allocation of productive zones, etc.

Thus, it is clear that given above for solving the problem of effective adjustable restricting 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 field of the regulated Ogre is to limit the flow of fluid in the well. The following describes one option, which has a flow chamber containing structure, providing increased resistance to the stream flowing through this chamber, with increase of the ratio of the share of unwanted fluid to the extent desirable fluid in a multicomponent fluid.

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 a subterranean well. This system can include a flow chamber through which flows a multicomponent fluid. This chamber contains at least one input, output and at least one structure located in a spiral relative to output. This design facilitates the twisting stream of the multicomponent fluid in a spiral around the exit.

Another aspect of the present invention is that the system of regulation of the flow resistance for use in a subterranean well can include a flow chamber having an outlet, at least one design that contribute to tightening the flow of multicomponent fluid in a spiral around the outlet, and at least one design that prevents the redirection of the flow of the multicomponent fluid to the radial trajectory, passing to the output.

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

Brief description of drawings

Fig.1 shows a schematic 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 image of the cross-section of part of the downhole system.

Fig.3A and 3B show enlarged images of transverse sections of the system of regulation of the flow resistance, taken along the line 3-3 shown in Fig.2, and in Fig.3A shows a system through which flows the stream at a relatively high speed and low density, and Fig.3B shows a system through which flows a stream with a relatively low speed and high density.

Fig.4 shows a cross-section of another configuration of the control system for the flow resistance.

The implementation of the invention

In Fig.1 shows an example of a well system 10, constructed on the basis of the principles of the present invention. As shown in Fig.1, the barrel 12 bore has a generally vertical uncased portion 14 passing through the second 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 shown in the drawings and described in this document wellbore system 10 is merely a specific example of the many IC is aginig 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 can 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, during injection of 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 the well is s 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 part of the barrel 12 bore may be casing or open hole 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 desirable fluid and so on

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) or 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).

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 to escalate steam, not water, hence, the steam is desirable fluid, and water is undesirable fluid.

It should be noted that at certain levels of temperature and pressure in the borehole gaseous hydrocarbons may actually be in a fully ilization 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 are 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) enters the downhole filter 24, where it is filtered 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 viscosity, speed and others) multicomponent fluid. Then multicomponent fluid 36 is output from the system 25 of the regulation of the flow resistance DNAs is R 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; multi-component 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 system of regulation of the flow resistance 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.

Despite the fact that wells is the first 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 multiple channels and devices to perform different functions. In addition, it is preferable that the system 25 at least partially passes 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 to the Onna 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 also provides a detailed image of the section of a variant of the system 25, which is shown in a two-dimensional view plane, but it should be understood that the system can be carried out in the circumferential direction and, if necessary, be located, for example, in the side wall of the tubular part.

In Fig.3A shows a system 25 regulation of the flow resistance, in which the multicomponent fluid 36 flows through the flow-through chamber 42 from inlet 38 to outlet 40. Multicomponent fluid 36 in Fig.3A has a relatively low viscosity and/or a relatively high speed. For example, if the desired fluid is oil, gas or water are undesirable fluids, as shown in Fig.3A, a multicomponent fluid 36 has a relatively high ratio of undesired fluid to the proportion of the desired fluid.

It should be noted that a flow-through chamber 42 contains device 44, which contribute to the twisting of the flow of multicomponent fluid 36 in a spiral around the outlet 40. Thus megacolon ntny fluid 36 flows to the outlet 40 of the trajectory, close to a circle with a gradually decreasing radius.

Preferably, the device prevents the redirection of the flow of multicomponent fluid 36 in the radial trajectory, passing to the outlet 40. Thus, although the spiral flow of multicomponent fluid 36, spinning devices 44 has a circular and radial components, it is preferable that these devices prevent the increase of the radial component of this flow.

In the variant shown in Fig.3A, fixtures 44 are separated from each other at a certain distance in the direction of the flow of multicomponent fluid 36. It is preferable that the distance between the devices 44 gradually decreases in the direction of flow of the stream of the multicomponent fluid 36.

In Fig.3A shows that the camera 42 has two input channels 46, each of which has several spaced from each other fixtures 44. It is obvious that according to the principles of the present invention, this camera can have any number of input channels 46 and fixtures 44.

In the chamber 42 there are additional devices 48, preventing the redirection of the flow of multicomponent fluid 36 in the radial trajectory. As shown in Fig.3A, fixtures 48 are separated from each other in circumferential and radial directions.

In the end, multicomponent fluid 36 is output through the bushing 40, the space between the devices 44, 48, with spiral and circular trajectory of the stream of the multicomponent fluid around 36 output is characterized by the dissipation of energy due to the flow of multicomponent fluid is relatively large resistance. Decreasing the viscosity of multicomponent fluid 36 and/or by increasing the speed of multicomponent fluid 36 (for example, by lowering the relations share the desired fluid to the proportion of unwanted fluid in a multicomponent fluid) the flow resistance increases. Conversely, by increasing the viscosity of multicomponent fluid 36 and/or decreasing the speed of multicomponent fluid 36 (for example, by increasing the relationship of the proportion of the desired fluid to the proportion of unwanted fluid in a multicomponent fluid) this flow resistance is reduced.

In Fig.3B shows a system 25 with such a high ratio of desired fluid to the proportion of unwanted fluid in a multicomponent fluid 36. Multicomponent fluid 36, having increased viscosity and/or low speed, with less resistance flows through the flow space between the devices 44, 48.

Thus, as shown in the embodiment of Fig.3B, a multicomponent fluid 36 to a greater extent flows directly to the outlet 40 than in the variant shown in Fig.3A. Flux is a multicomponent fluid in the variant of Fig.3B also moves along the spiral path, but he twisted in a spiral, to a lesser extent than in the case of the variant of Fig.3A. Thus, in the variant of Fig.3B the energy dissipation and flow resistance is substantially smaller in comparison with the variant in Fig.3A.

In Fig.4 also shows an image of another system configuration 25 regulation of the flow resistance. In this configuration, in the chamber 42 has a larger number of input channels 46 in comparison with the configuration shown in Fig.3A and 3B, and also has two arrays of devices 44, spaced from each other in the radial direction and contributing to the tightening of the thread spiral. Thus, it is clear that there can be built a variety of system configurations regulation of the flow resistance without deviating from the essence of the present invention.

It should be noted that the input channels 46 are gradually narrowing in the direction of flow of multicomponent fluid 36. This narrowing causes the reduction of the sectional area of flow, causes a slight increase in the rate of multicomponent fluid 36.

As in the case of the configuration shown in Fig.3A and 3B, when reducing the viscosity of multicomponent fluid 36 and/or increasing the speed of multicomponent fluid 36 flow resistance flowing through is shown in Fig.4 system 25 increases. Conversely, if Uwe is icenii viscosity of multicomponent fluid 36 and/or decreasing the speed of multicomponent fluid 36 flow resistance, flowing through is shown in Fig.4 system 25, is reduced.

In each of the above configurations of the devices 44 and/or 48 may be in the form of vanes or grooves on one or more walls of the chamber 42. If devices 44 and/or 48 are views of the blades, they can be out from the wall (wall) of the chamber 42. If devices 44 and/or 48 have the form of slots, they can be inside the wall (wall) of the chamber 42. Redirection of the flow of multicomponent fluid 36 to the desired trajectory or function of preventing the change in the direction of flow of the multicomponent fluid can be devices of any type, in any amount, of any configuration, with any wall space between them.

At this stage of the description of the invention should be understood that the present invention is characterized by a significant improvement of existing adjustable flow restrictors in the well. It is preferable that the above-described system options 25 regulation of the flow resistance operate autonomously, automatically and without the use of moving parts, which ensures the reliability of the regulatory process flow between the reservoir 20 and the inner space of the tubular column 22.

One aspect of the above invention is to create a system 25 of the regulation to fight the Oia stream for use in a subterranean well. The system 25 can include a flow chamber 42, through which flows of multicomponent fluid 36. The chamber 42 contains at least one inlet 38 and outlet 40 and at least one device 44 located in a spiral relative to the outlet 40, and the device 44 facilitates tightening the flow of multicomponent fluid 36 in a spiral around the outlet 40.

Another aspect of the present invention is that the above system 25 regulation of the flow resistance includes a flow chamber 42 with the outlet 40, at least one device 44, contributing to tightening the flow of multicomponent fluid 36 in a spiral around the outlet 40, and at least one device 48, preventing the redirection of the flow of multicomponent fluid 36 in the radial trajectory, passing to the outlet 40.

It is preferable that the multi-component fluid 36 flows through the flow-through chamber 42 located in the well.

The device 48 provides increasing resistance to redirect the flow of the multicomponent fluid to the radial trajectory, passing to the outlet 40, if one of the following factors: a) increased speed of multicomponent fluid 36, b) reduced viscosity of multicomponent fluid 36 in) low ratio of desired fluid to the share of spam is luida in multicomponent fluid 36.

The device 44 and/or 48 may include one or more blades and grooves. The device 44 and/or 48 may be at least in one direction - outward or inward from the walls of the chamber 42.

The device 44 and/or 48 can contain multiple distant from each other. Pass the space between adjacent devices 44 can be reduced in the direction of the spiral path of flow of the multicomponent fluid 36.

Preferably, when the increase in viscosity of multicomponent fluid 36, decreasing the speed of multicomponent fluid 36 and/or the increase of the ratio of the share of the desired fluid to the proportion of unwanted fluid in a multicomponent fluid 36 flows to a greater extent directly to the output 40.

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 izobreteny is.

In the above description of embodiments of the invention the words that match the signs, such as "above", "below", "upper", "lower" (with regard to their paradigms), etc., are used for convenience of illustration of the information contained on the relevant drawings. In the General sense of the word "above", "upper", "upward" (with regard to their paradigms), etc., Express the direction along the well to the surface of the earth, and the words "below", "bottom", "down" (with regard to their paradigms), etc., Express the direction along the borehole from the earth's surface.

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. Regulation of the flow resistance for use in Ozernoy well including a flow chamber through which flows a multicomponent fluid, and this chamber contains at least one input, output and at least one structure located in a spiral relative to output and contributing to tightening the flow of multicomponent fluid in a spiral around the exit.

2. The system under item 1, wherein the multicomponent fluid flows through the flow chamber located in the well.

3. The system under item 1, characterized in that the structure resists redirection of the flow of multicomponent fluid to the radial trajectory, passing to the exit.

4. The system under item 3, characterized in that the design provides increased resistance to redirect the flow of the multicomponent fluid to the radial trajectory, passing to the exit, if one of the following factors: a) increased speed of multicomponent fluid, b) reduced viscosity of multicomponent fluid, and C) a reduced ratio of desired fluid to the proportion of unwanted fluid in a multicomponent fluid.

5. The system under item 1, characterized in that the structure contains one or more blades and grooves.

6. The system under item 1, characterized in that design is, at least in one direction - outward or inward from the walls of the chamber.

p> 7. The system under item 1, characterized in that at least one of the structures contains many distant from each other.

8. The system under item 7, characterized in that the flow space between adjacent structures is reduced in the direction of the spiral path of flow of the multicomponent fluid.

9. The system under item 1, characterized in that by increasing the viscosity of multicomponent fluid flows to a greater extent directly from input to output.

10. The system under item 1, characterized in that reducing the speed of multicomponent fluid flows to a greater extent directly from input to output.

11. The system under item 1, characterized in that with increase of the ratio of the share of the desired fluid to the proportion of unwanted fluid in a multicomponent fluid flows to a greater extent directly from input to output.

12. Regulation of the flow resistance for use in a subterranean well, comprising a flow chamber having an outlet, at least one of the first design, contributing to the tightening of multicomponent fluid in a spiral around the outlet, and at least one second structure, preventing the redirection of the flow of the multicomponent fluid to the radial trajectory, passing to the exit.

13. The system under item 12, wherein the multicomponent fluid flows h is flowing through the chamber, located in the well.

14. The system under item 12, characterized in that the second design provides increased resistance to redirect the flow of the multicomponent fluid to the radial trajectory, passing to the exit, if one of the following factors: a) increased speed of multicomponent fluid, b) reduced viscosity of multicomponent fluid, and C) a reduced ratio of desired fluid to the proportion of unwanted fluid in a multicomponent fluid.

15. The system under item 12, wherein the first structure includes one or more blades and grooves.

16. The system under item 12, wherein the second structure includes one or more blades and grooves.

17. The system under item 12, characterized in that the first design is, at least in one direction - outward or inward from the walls of the chamber.

18. The system under item 12, characterized in that the second design is, at least in one direction - outward or inward from the walls of the chamber.

19. The system under item 12, characterized in that the at least one second structure contains many distant from each other.

20. The system under item 12, characterized in that at least one of the first design contains many distant from each other.

21. System on p. 20, characterized in that prohodna the space between adjacent first structures decreases in the direction of the spiral path of flow of the multicomponent fluid.

22. The system under item 12, characterized in that by increasing the viscosity of multicomponent fluid flows to a greater extent straight to the exit.

23. The system under item 12, characterized in that reducing the speed of multicomponent fluid flows to a greater extent straight to the exit.

24. The system under item 12, characterized in that with increase of the ratio of the share of the desired fluid to the proportion of unwanted fluid in a multicomponent fluid flows to a greater extent straight to the exit.



 

Same patents:

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.

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FIELD: oil and gas industry.

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EFFECT: effective control of fluids flow.

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FIELD: oil and gas industry.

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EFFECT: increased efficiency of the method.

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FIELD: oil-and-gas industry.

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1 ex

FIELD: oil and gas industry.

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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: 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 opposites oil-saturated zone of the formation after waiting period of the insulating compound hardening, perforation opposite oil-saturated zone of the formation, and development of the well. At arrangement of water-saturated zone below oil-saturated zone of the formation and thickness of non-permeable natural interlayer of 0.5 to 4 m at the bottom interval of non-permeable natural interlayer there installed is a blind packer; some part of the casing string is cut out from the blind packer to the roof of the formation oil-saturated zone; the well shaft is expanded at the interval of the cutout part; the expanded well shaft interval is filled with insulating compound. Microcement is used as the above insulating compound so that an insulating bridge is obtained. After waiting period of microcement hardening, the insulating bridge and the blind packer are drilled so that the screen remains opposite non-permeable natural interlayer and oil-saturated zone of the formation with the diameter equal to inner diameter of the casing string; water-saturated formation zone is cutout by placing in the casing string below the cut-out part of a stationary packer with a perforated shank with a limit stop on the working face from below and a sealing joint from above. After that, the cut-out section of the casing string is fixed in the well by lowering an additional string with its installation opposite the cut-out section of the casing string and tight fixation of upper and lower ends of the additional string in the casing string above and below the cut-out section in the well. When oil-saturated zone of the formation is being introduced to the development, drilling perforation of an additional string is performed opposite oil-saturated zone of the formation. During development of water-flooded oil deposit, periodic operation of oil-saturated and water-saturated formation zones is performed.

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.

6 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: engines and pumps.

SUBSTANCE: proposed device comprises display-based visualisation unit, computer system, mechanical extraction device and downhole motor. Additionally, this device incorporates the units of downhole telemetry system connected with downhole motor. Outputs of this system are connected with the surface telemetry system connected via controller with the first visualisation unit, 1st, 2nd, 3rd, 4th and 5th processing units. Note also that outputs of [processing units are connected via computer with 2nd visualisation unit.

EFFECT: higher accuracy of evaluation owing to application of classifiers.

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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