Device and method for dual-zone production from wells

 

(57) Abstract:

The invention relates to the production of liquid hydrocarbons from a well, applies in particular to the simultaneous extraction of liquid hydrocarbons from wells having two zones of production, which are communicated with the bore, and provides a simplification of the device and increase the efficiency of the method. The inventive method and device are intended for the production of liquid hydrocarbons through one production casing pipes of the two zones, which are communicated with the hole. The device comprises a packer placed in the wellbore to selectively prevent fluid flow through the bore from the first zone to the second zone, the production casing pipe, which passes through the hole and communicated through fluid through the packer from the second area. There are first and second pumps to move the liquid through the production casing pipes. The second pump moves fluid from the lower zone into the production casing pipes. Perforated connector placed in the production string of pipe between the first and the second pumps. The second pump has a design capacity at design speed and type, which prevents the flow of fluid through noonday the string of pipe above the second pump and has a predetermined performance at operating speed, which is more than the performance of the second pump on the value of the performance desired production from the first zone. Lower the pump dispenses the fluid from the lower zone and the upper pump pumps fluid from the well so that both zones are produced simultaneously without loss of liquid from any zone regardless of the zone in which the pressure is lower. Means to control the message by means of fluid through the packer depends on the zone in which the pressure is higher. 2 c. and 12 C.p. f-crystals, 5 Il.

This invention relates to the production of liquid hydrocarbons from hydrocarbon wells and in particular to the simultaneous extraction of liquid hydrocarbons from wells having two zones of production, which are communicated with the hole.

It is not unusual that a hydrocarbon borehole passes through two or more hydrocarbon productive formations or zones, which have different potential prey. Because the potentials of the different production zones neuravnoveshen, it is undesirable to give fluids from different zones freely mixed with each other, as this may adversely affect the overall productivity of the wells. In many areas of government regulations also prohibit the free mixing of the liquid which is to isolate zones through the use of packers or similar devices and production in some time from one zone from the borehole bottom to the depletion of each zone.

The disadvantage of this method is that the performance of the wells varies between a maximum production for each zone and minimum production with the depletion of each zone. Another disadvantage of this traditional method is that while the lower area is developed, the hydrocarbon fluid in the upper zone may be irretrievably lost in another borehole or the like.

Another traditional method of production of the multi-zone well is the development of each zone through a separate production casing. This method has several disadvantages. First, wells often are drilling without knowledge of the number of production zones, which will be met. For cost savings is usually for the drilling of wells using casing of such a diameter that allows you to host only one production casing pipes. If the bore of such a diameter face several areas of mining, the extraction of several production casing is impractical or impossible.

Known devices for oil and gas from the multi-zone wells (see U.S. patent 3746089 and 3765483, 1973).

In U.S. patent 3346089 describes a device for the extraction of two or bol the products from the different areas are mixed, and the mixture rises to the earth's surface one pump. The disadvantage of these devices is that, if the natural pressure in the two zones is unbalanced, while the area with higher pressure will not be exhausted, the other area will never be developed, because the area with higher pressure will always prevail in the production, leaving bypassed zone of lower pressure.

In U.S. patent 3765483 describes a method and device for production from two oil wells, when hydrocarbon fluids from each zone allow to drain in a separate chamber, where the product from each zone pumps single pumps driven by a common column rods.

Products from separate pumps are mixed and transmitted to the surface through one pipe. The product from the lower zone of the pump through the passage, which bypasses the upper zone into a common header pipe, from where it is issued. Pass and shut-off valve through which the product from the upper zone is pumped by the second pump, placed in the annular housing. Two zones thus produce liquid hydrocarbons independently, and the hydrocarbons are mixed in the upper part of the production string of pipe above torquein considerable diameter, which could easily accommodate two casing pipes.

The aim of the invention is a device for production of hydrocarbons from two wells through a single production casing pipes, which would be simple and inexpensive to manufacture.

A further purpose of the invention is to provide a device for production of hydrocarbons from two wells, which would allow to measure the production from each zone with the desired performance so that correspondingly regulated the production from the well.

Another aim of the invention is to provide a device for production of hydrocarbons from two wells, in which a column of pipes, including pumps, can be prepared on the surface and introduced into the borehole for developing areas without loss of liquid hydrocarbons in a low-pressure zone before production string of pipe is lowered into the well, and at a time when production string of pipe must be removed from the well for maintenance of pumps, etc.

These and other objectives of the invention are achieved in a device for the production of liquid hydrocarbons through one production casing pipes of the first and second zones with
packer located in the bore between the first and second zones of production;

production casing pipe, which passes through the bore and is in communication through a fluid through the packer from the second area;

the first pump to move the fluid in the first direction when the pump is used for pumping in this direction, and the first pump has a predetermined performance for pumping liquids in the first direction when he works with a pre-determined speed;

the second pump to move the fluid in the first direction when the second pump is used for pumping in this direction, and the second pump is arranged to prevent the flow of fluids through the pump in either direction when the pump is used for pumping, and the second pump has a predetermined performance for pumping liquids, when he works with a pre-determined speed, and performance of the second pump is less than the capacity of the first pump when it is operating with a predetermined speed;

the first and second pumps operational attached to the string of pipe for hydrocarbon which control the first and second pumps, inlet hydrocarbon fluids from the first zone into the production casing pipe; and

means for actuating the first and second pumps with a predetermined speed.

In the claimed invention also offers a method of simultaneous production of liquid hydrocarbons from the first and second zones, which are communicated with a hydrocarbon well, namely, that:

place the packer in the borehole between the first and second zones, and the packer provides selective movement of fluid between the second zone and the production column pipes when joining a production string of pipe;

prepare the string of pipe, which contains the first pump for the extraction of liquid hydrocarbons from the first zone, a second pump for the extraction of liquid hydrocarbons from the second zone and the perforated connector between the first and second pumps for providing entry of liquid hydrocarbons in the production casing pipe between the first and second pumps, the first pump has a first capacity and the second pump has a second performance for pumping liquid hydrocarbons, with the first performance more than the second performance priblizitelen the direction through it, when the pump is actuated for pumping;

hang the string of pipe into the well so as to provide selective transmission of fluid between the second area and the column pipe;

enter the drive means through the production casing pipe for actuating the first and second pumps; and

actuate the first and second pumps with the same speed so that liquid hydrocarbons were extracted from the second zone of the second pump to the column pipe and stood out from the well the first pump, which raises the liquid produced from the second zone along with the desired production from the first zone.

Thus, in accordance with the invention proposes a device and a method of production of hydrocarbons from drill hole and having first and second extraction zone with an unbalanced pressure of the liquid. The device is easily and economically assembled and can be omitted in any casing large enough to accommodate one production casing pipes. The device in accordance with the invention includes a packer set between the two production zones to prevent communication through the fluid between zones. The packer shall be designed to provide connectivity posit from the upper or lower zone is a zone of lower pressure area of the "thief"). If the upper zone is "the thief", the packer can be simple Salnikov packer wells shut-off valve having a spring-loaded cover which closes the lower end of the well compacted, preventing communication through the packer through the liquid. If the lower zone is the "thief" requires a different packer. Preferred for use in these circumstances is the new design of the packer, hereafter referred to as "insulating packer", which preferably contains a mechanism for impermeable to fluid connection with the column pipe at the upper end of the packer and the rotary sleeve valve at the lower end of the packer, which can be selectively opened or closed by rotating the pipe string from the surface to selectively control the communication of fluid between the casing pipe and the area of the "thief".

In addition to the packer to isolate and selectively control fluid communication between the zones of the extraction device further contains a string of pipe having a first pump for the extraction of liquid hydrocarbons from the first zone and the second pump for the extraction of liquid hydrocarbons from the second zone. The first is Noah speed, and the second pump has a pre-established performance when it is operating at this speed, which is less than a predefined performance of the first pump. Perforated connector or similar placed between the first and second pumps to provide passage of fluid from the first zone into the production casing pipes. Preferably the first column of rods is used to operate the first pump and the second column rod connects the first and second pumps so that two pumps operated at the same speed. When the pumps are working, liquid hydrocarbons are fed through a second pump in the operating string of pipe. Since the first pump is a highly efficient, liquid hydrocarbons are served in the operating string of pipe from the first zone and mixed with the liquid produced from the second zone. The first pump raises mixed liquid hydrocarbons to the surface. While liquids are mixed, the mixing occurs only within the tubing, while both pumps are operable.

The device in accordance with the invention thus provides controlled, metered simultaneous production of both C the raised area of high pressure, the second pump is effective doses extraction from the second zone, while the first pump provides the production of hydrocarbon fluids from the first zone with the desired performance and brings to the surface the production from both zones. If the lower zone is "the thief", the second pump provides the extraction of the second zone, while the first pump dispenses the production of hydrocarbon fluids from the first zone and brings to the surface the production from both zones. The performance of each pump can be selected to produce the desired volume of fluid from each zone, thus smoothing and potentially prolonging the production from the well. Since the communication of fluid between zones is prevented, the device meets the standards that prohibit the communication of fluid between the various areas of production.

In the proposed device, it is preferable to use pumps progressive cavity (Progressive Cavity Pumps (PCPs)), but any positive displacement pump, which effectively prevents fluid flow when not in use for pumping, can be used in the device in accordance with the invention. Examples of such pumps are plunger pumps and pumps with Vneshnyaya area "thief", if you have not added a third valve which opens and closes a reciprocating plunger or drive rod. Such devices exist and are known in the art. Hereinafter the invention is explained by examples and drawings.

In Fig. 1 shows a schematic section of the known device for the simultaneous production of liquid hydrocarbons from two zones in hydrocarbon drilling the borehole;

in Fig. 2 shows a schematic partial section of part of the hydrocarbon borehole with a casing and a device in accordance with a first variant implementation of the invention;

in Fig. 3 - the same, when the device is mounted in operating position in a borehole, and a column of rods attached in position for extraction of fluids from the well;

in Fig. 4 shows a schematic drawing in partial section, showing the device in accordance with a second variant implementation of the invention;

in Fig. 5 is the same when the pipe is in position for extraction of liquid hydrocarbons from a well, and a column of rods attached to the device.

In Fig. 1 shows a schematic drawing of hydrocarbon borehole 10, which passes through first the population, and the first area 12 is an area of low pressure, commonly referred to as the zone of "thief". High pressure zone 14 may be natural enough pressure to lift the hydrocarbons that enter the reservoir through the perforations 18 of the casing 16 in its lower part to the perforations 18 in the zone of the "thief" 12, where the hydrocarbons can be lost if the communication of fluid between the two zones is not terminated. For this purpose, the packer 20, well known in the art, is installed between zones to prevent transfer of fluid from the zone of higher pressure 14 in a low-pressure zone 12. For hydrocarbon production simultaneously from both areas well known in the shown device is operated using two independent production casing pipes, consisting of a primary pipe string 22 and the secondary pipe string 24. Such an arrangement is feasible only if the lower part of the casing 16 is large enough to accommodate both the tubing, that is, it must have a diameter of at least about 7" (inches). In a typical configuration of such a device for the extraction of surface casing 26 supports the upper part of the casing 28, which is connected to the lower end of the paragraph is part of the casing 16 and is used in cases when dual suspension design of the production string of pipe to the head of the well, the head 34 of the tubing separates the tubing enough to ensure that they do not fall directly into the lower casing production casing 16. In this situation, lower operational casing may be hung from a more intermediate or surface casing, if it is feasible and permitted, or an adapter to a larger casing is used so that there is sufficient length for column pipes bent and joined to the lower operating casing 16. To the top surface of the casing 26 attached to the head part 32 of the casing, which supports the head 34 of the pipe string. The head 34 of the tubing, in turn, supports the primary string of pipe 22 and a secondary string of pipe 24, as well as appropriate equipment pump drive (not shown) in a manner known in the art. At the bottom of each of the primary production casing pipe 22 and the secondary pipe string 24 has a pump 36, such as a pump progressive cavity (PCPs). The pumps operate with the surface of the columns of rods 38 by the way, is well known in the substance, they do not wear out upon contact with the sides of the columns of tubes. Dual device anchor/lock 40 is used to connect together two columns of the pipe below the pump 36 connected to the lower end of the secondary pipe string 24 to ensure that the tubing is coupled to resolve the movement of the columns relative to each other and thus minimize wear.

The advantage of the device shown in Fig. 1, is that the two zones 12 and 14 are developed simultaneously with the desired performance of production regardless of the fluid pressure in each zone. Both areas are developed at the same time, the extraction wells are relatively stable and predictable, and the fluid is not lost from any of the zones in other wells due to interruptions in production. The principal disadvantage of this known solution is that the casing must be large enough to accommodate two casing pipes, and it requires two columns of special shape with independent drives.

In Fig. 2 shows a first embodiment of a device in accordance with the present invention. This run is intended for use in cases where the first zone EXT the column 42, which is communicated with the upper zone 12 and the bottom area 14 is perforated to provide fluid flow into the casing from each of the zones. Sealing packer 44 wells installed in the borehole above the second zone 14 production pipe or cable devices using methods well known in the art. Sealing the packer 44 may be permanent or removable type and is equipped with a seal bore (not shown). The seal bore is precisely machined area of the borehole having a surface, a seal which can be performed O-shaped rings, as will be explained in more detail below. Shut-off valve 46 is located on the bottom side of the packer to prevent the flow of fluids up through the stuffing box packer bore when the valve 48 is in the closed position. This type of packer is well known in the art and typically used in gas wells high pressure for extraction of corrosive gases that should not be allowed to enter the collector above the seal.

Production string of pipe 50 is inserted into the borehole for developing the first zone 12 and the second zone 14. In accordance with the preferred wasow, such as PCP, is mounted on the surface. The lower part of the casing pipe 50 includes an extension 52 of the seal bore. This extension cable can be inserted through the seal bore in the packer 44 to force the flap opening 48 of the stop valve 46 to provide communication through the fluid between the second area extraction 14 and the column pipe 50. There is a seal between the extension 52 and the seal bore in the manifold 44 through a set of O-rings 54, held in radial grooves on the outer surface of the extension 52. Above the extension 52 are the first pump 56 and the second positive displacement pump 58. Each pump has a certain, predetermined performance and degree of pressure, as will be described in more detail in relation to Fig. 3. The first pump 56 and the second positive displacement pump 58 is connected at least perforated, usually short connector pipe 60, commonly referred to as the junction of the "pup" or "sub". Perforated connector tube 60 allows liquid hydrocarbons flowing from the top of the extraction zone 12, to enter the string of pipe 50, as will also be explained below in relation to Fig. 3.

In Fig. 3 shows how a column of pipes described above, wodis iannou the valve 48 in the open position so liquid hydrocarbons from the extraction zone 14 are in communication through the fluid with the production column pipe 50. The first pump 56 and the second positive displacement pump 58 are preferably PCP pumps, which are interconnected column rods 62 so that they are driven with the same speed. After production string of pipe 50 is in position for extraction, as shown in Fig. 3, the drive column, usually a column of rods 64, is introduced into the production casing pipe 50 from the surface. The lower end of the drive column 64 preferably contains an enclosing element 66 vkluchaya-off of the connecting mechanism. Covering component 66 is connected with the top of the covered element 68 vkluchaya-off of the connecting mechanism. The element 68 is attached to the top of the rotor of the first pump so that the drive column 64 may be rotated for a concerted drive pumps 56 and 58.

For the production of liquid hydrocarbons from the well drive the column 64 is rotated to drive the first pump 56 and the second pump 58. As explained above, at least the second pump 58 is a positive displacement pump, so that it prevents the flow of fluid is STI between zones is controlled, and no liquid is lost from areas of high pressure 14 in a low-pressure zone 12 when the pumps are not working. When the pumps are driven, the second pump 58 dispenses the fluid from the higher pressure zones 14 in the manifold casing pipe 50. As explained above, the first pump 56 is performance and pressure sufficient to raise the liquid hydrocarbon product to the surface, while the second pump 58 may have a low pressure as it passes the fluid from the lower zone to a small height. As noted above, when the lower zone is a zone of high pressure, a second pump 58 operates rather for dispensing fluid from the lower zone than to pump it, if the lower zone has enough natural pressure to raise liquid hydrocarbons by the second pump 58. If so, then when the drive column 64 operates with a predetermined drive speed, the fluid metered by the second pump 58, enters the production casing pipe 50. As metered fluid flow through the second pump 58 is less than the capacity of the first pump 56, the liquid hydrocarbons are drawn from the second extraction zone 12 through the perforated connector 60 pipe string and up the to liquid hydrocarbons extracted from each of the zones 12 and 14. Choosing the right performance for the first pump 56, and the second pump 58 can be set to control the desired rate of production from each zone.

If the string of pipe 50 should be lifted for maintenance of pumps or similar work, the flap 48 shutoff valve 46 is closed to prevent fluid flow from the second zone 14 to the first zone 12, and therefore prevent communication of fluids between zones. After the service is completed, the column pipe 50 is injected back into the well, and fluid communication with the column pipe is restored when the extension tube 52 is inserted through the seal bore in the packer 44 to open the spring-loaded valve 48.

In Fig. 4 shows a second preferred embodiment of the invention, which is intended for use in the case where the first area extraction 12 has a higher pressure than the second area extraction 14. In this case, the sealing packer wells shut-off valve shown in Fig. 2 and 3, is not necessarily satisfactory, because the fluid pressure in the upper zone production may outweigh created by the spring load of the valve 48 to provide communication through idkey may be lost in the zone 14 a lower pressure and, perhaps in another well. Packer 70 (hereinafter called an isolation packer) is introduced into the well with the help of devices, consisting of a column of pipes or cables in a manner known in the art. Insulating packer 70 includes at its lower end of the isolation valve 72 and the covered element 74 in the locking mechanism mounted on the upper end of the packer 70. Isolation valve 72 includes an inner tube (not shown) connected to rotate with the covered element 74, and an outer tube fixedly associated with isolating packer 70. Each pipe contains a number of radial holes, which can be installed in one line, when the inner pipe is rotated relative to the outside so that the holes in the two flanges allow fluid flow to pass through the isolation valve 72. The rotation of the internal pipe is carried out by rotating the covered element 74. To the lower end of the casing pipe 50 attached covering element 76 corresponding to the covered element 74 to ensure that the operation of the isolation valve 72 by rotation of the operating pipe string 50. In all other respects explores positive displacement pump 58 are pre-determined performance and the degree of pressure so that the second pump 58 extracts the fluid from the lower zone 14 in the operating string of pipe 50, which is mixed with the production from the upper zone 12, is extracted through the perforated connector 60, the first pump 56 and rises to the surface, as described above.

In Fig. 5 shows a production string of pipe 50, passing through the casing 42 wells covering element 76 associated with the covered item 74 (see Fig.4), which is connected to the top of the insulating packer 70. After you enter in the engagement of the elements of the locking mechanism of the column pipe 50 is rotated approximately 1/4 turn to open holes in the isolating valve 72 to provide communication of fluid between the casing pipe 50 and the second area extraction 14. As the second pump 58 is a positive displacement, fluid moves from the upper zone production 12 in a low-pressure zone 14. Liquid seal locking mechanism with elements 74, 76 to prevent fluid flow from the collector of the casing 42 in the isolation valve 72. Thus preventing fluid flow between the first area extraction 12 and the second area extraction 14. After the column pipe 50 is introduced into the borehole, the drive column 64 (" the element 68, attached to the top of the rotor of the first pump 56. When driving the column 66 is rotated, as the first pump 56, and a second pump 58 extract hydrocarbons from the respective zones of production, as explained above. If you need to maintain the pump operating string of pipe 50 is turned to close the isolation valve 72. The locking mechanism is disconnected, the drive column 64 is extracted from the production string of pipe 50, and the production casing pipe 50 is withdrawn from the well to produce the required repair. Insulating packer 70 ensures that while going maintenance of pumps, there is no communication through the fluid between the upper zone 12 and the bottom area 14. After service production casing pipe 50 is injected back into the well and the isolation valve 72 is opened, as explained above. Drive column 54 is introduced into the production casing pipes 50 and resumed normal production.

For specialists in the art will understand that the pumps in the production string of pipe 50 can be inserted pumps, so they can be removed together with the drive column 64 as an alternative to removing the casing pipe 50 from the well to discuss ENISA the string of pipe, for example, the diameter of 27/8" API (American petroleum Institute), i.e. approximately 21/2" ID (inner diameter), and the upper pump must be installed in the larger pipe, for example, with a diameter of 31/2" API (approximately 3" ID) so that the collected second pump could pass through the connecting pipe for the first of the assembled pump. With this exception all the principles described above are applicable, and each pump is chosen to have a capacity desired for the production from each zone, when the pumps lead to a consistent action with a predetermined speed.

Professionals it is clear that the use of a packer with a shut-off valve 46 or isolation valve 72 is not significant, if temporary fluid communication between the upper zone 12 and the bottom area 14 may be admitted to the time required to move the string of pipe 50 into the well or from it. However, it is preferable that the fluid communication between the upper zone 12 and the lower zone 14 was not allowed by using a lip liner 44 or insulating packer 70, described above, depending on the relative hydraulic pressure of the upper zone 12 and the lower zone 14.

Experts also clear that isomerous the e high pressure. Sealing packer 44 (Fig.2 and 3) is preferably used only when the second zone is a zone of high pressure, because it is less costly to produce. It is also clear that other types of packers and valves than described above can be used to selectively prevent fluid flow between the first and second zones.

Embodiments of the invention described above are only examples and do not limit the scope of the present invention, which is defined by the claims.

1. Device for the production of liquid hydrocarbons through one production casing pipes of the two production zones, communicating with hydrocarbon drilling well, the first zone is located closer to the top of the well, containing the packer located in the bore between the first and second zones of production, the production casing pipe through the hole and connected by fluid from the second zone through the packer, the first pump to move the fluid in the first direction having a predetermined performance for pumping liquids in this direction and the predetermined speed, the second pump to move fluids in the first absoltuely for pumping, and having a predetermined performance for pumping liquids and the predetermined speed, and the performance of the second pump is less than the capacity of the first pump when working with a pre-determined speed, the first and second pumps in communication with the column pipes for the production of hydrocarbon fluids from the first zone and the second zone, respectively, by the column pipe, and means located between the first and second pumps for admission of hydrocarbon fluids from the first zone in the operating string of pipe, means for actuating the first and second pumps with a predetermined speed.

2. The device under item 1, characterized in that the means for actuating the first pump is made in the form of the column bars.

3. The device according to p. 2, characterized in that the means for actuating the second pump is made in the second column of rods, cross-cutting the first and second pumps.

4. The device under item 1, characterized in that, when the first zone is a zone of low pressure, the packer is made in the form of a sealing packer located with its lower end normally closed by SANIIRI the end of the production string of pipe provided with a strip of packing wells forcibly opening the spring-loaded flap, when it is inserted into the packer through the seal of the latter.

6. The device under item 1, characterized in that, when the second zone is a zone of low pressure, the packer is made in the form of insulating packer containing isolation valve with a conduit for fluid flow, which can be selectively opened or closed by movement of the operating pipe string.

7. The device according to p. 6, characterized in that it is provided with vkluchaya-shut locking mechanism for connecting the operating pipe string, isolating packer.

8. The method of simultaneous production of liquid hydrocarbons from two areas, reported from hydrocarbon drilling well, namely, that installs a packer between the first and second zones, and the packer allows selective transfer of fluid between the second zone and the production column pipe, when it is connected with the latter, make preparation of the tubing containing the first pump for the extraction of liquid hydrocarbons from the first zone, a second pump for the extraction of liquid hydrocarbons from the second zone and the perforated connector between the first and second pumps for entry of liquid coal is the air traffic management the first pump more performance of the second pump by an amount approximately equal to the desired performance of the first zone and the second pump prevents the passing of the flow of hydrocarbons in any direction when the pump is actuated to pump, insert the operating string of pipe into the well so as to provide selective passage of fluid between the second zone and the production column pipe, insert the drive means through the production casing pipe for actuating the first and second pumps actuate the first and second pumps with the same speed so as to liquid hydrocarbons were produced from the second zone of the second pump to the column pipe and removed from the well the first pump that pumps the liquid produced from the second zone, plus desirable prey from the first zone.

9. The method according to p. 8, wherein, when the first zone is a zone of low pressure, use a lip liner with a normally closed shut-off valve having a spring-loaded flap.

10. The method according to p. 9, characterized in that the lower end of the tubing supply extension cable gland well that is inserted through the seal in sealing the packer to open the spring-loaded flap.

12. The method according to p. 11, characterized in that the lower end of the tubing do with covering element in the locking mechanism, with the cover element is engaged with installed on top of the insulating packer covered element of this locking mechanism.

13. The method according to p. 12, characterized in that provide selective transmission of fluid from the second zone in the column pipe by movement of the pipe string from the head part of the well.

14. The method according to p. 13, wherein the string of pipe is moved to close the isolation valve when the pipe must be disconnected from the isolation packer.

 

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1 ex, 2 dwg

FIELD: oil field development, particularly obtaining oil from a deposit by flooding.

SUBSTANCE: method involves drilling injection and production wells; injecting liquid in wells and extracting product. Wells are drilled along with local valleys and projections investigating. Natural formation water directions are assigned as water flow direction from projections to valleys. Then formation permeability anisotropies created by above flow are determined. Peripheral and line injection wells are located in correspondence with natural formation water flow direction, namely at outer oil-bearing contour from natural formation water flow entering side. Intracontour well rows are additionally arranged substantially transversally to natural formation water flow direction. Production wells are drilled substantially transversally to natural formation water flow direction.

EFFECT: increased oil output due to improved high-permeable formation injectivity and decreased number of injection wells.

1 ex, 2 dwg

FIELD: oil and gas industry, particularly downhole equipment to be installed in oil and gas reservoirs.

SUBSTANCE: device comprises hollow body with discharge channels threadedly connected to flow string. The body is provided with shell having orifices and pressure nut. Spring, valve and replaceable head are arranged in annular gap between the body and the shell. The spring is installed between upper and lower support washers. The valve is located between upper support washer and shell ledge. The replaceable head is secured to the shell by means of pressure nut. Sleeve with orifices is coaxially installed inside the body between body extensions so that the sleeve may be displaced by wire-line equipment tool to misalign or align sleeve and shell orifices with discharge body channels.

EFFECT: provision of fluid flow from underlying reservoir to overlaying one.

2 cl

FIELD: oil and gas production industry, particularly methods or apparatus for obtaining oil, gas, water and other materials from multizone wells.

SUBSTANCE: device comprises packer with flow blocking means formed as hollow body with orifices located over and under sealing member of the packer. Pipe is arranged inside the body so that the pipe is concentric to body axis. Lower pipe end is connected to the body, upper part thereof cooperates with annular bush over outer pipe surface. Annular bush may move in axial direction and is provided with annular sealing means and with shear pins, which fixes the bush inside the body. After pin cutting annular bush moves downwards and closes body orifices located over sealing packer member to cut-off flow leaving orifices below sealing packer member.

EFFECT: extended water-free oil well operation period, increased oil recovery and reduced oil production costs due to elimination of water lifting charges and prevention of well bore zone contamination.

4 dwg

FIELD: oil industry.

SUBSTANCE: method comprises setting the jet pump into the well. The housing of the pump is provided with the central nozzle, openings for inflow of fluid, and radial passages. The openings for inflow of fluid are shut off by means of valving members. The jet pump is mounted between the top and bottom oil-bearing beds.

EFFECT: enhanced efficiency.

2 dwg

FIELD: oil production, particularly to produce watered oil and produced water utilization.

SUBSTANCE: pumping plant comprises pumps, which may be serially installed in well and provided with inlet and outlet means, drives and packer. Packer may be located inside well between beds. One bed is filled with oil-water mixture, another bed, namely lower one, is adapted for water receiving. Plant comprises screw pumps with drives installed on surface and polished shaft with gasket to connect worm shaft of upper pump with that of lower one. Lower screw pump has inlet means with radial orifices to receive water phase separated from oil-water mixture, as well as with slots. Lower pump comprises case, which defines channel for water injection into lower bed via above channel and through slots made in inlet means of lower pump during the same auger shaft rotation.

EFFECT: increased efficiency due to surface-driven screw pump usage.

3 dwg

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