Water control well completion open hole packer and setting tool and method thereof

Abstract

The invention relates to a water control well completion open hole packer and a setting tool and method thereof, and the packer comprises a piston movement mechanism which comprises a packer body and a cylinder sleeve, the cylinder sleeve is arranged on the packer body in a sleeving manner, a cavity is reserved between the cylinder sleeve and the packer body, a piston is arranged in the cavity, and a pressure transmission through hole communicated with the cavity is formed in the packer body; the piston retaining mechanism comprises a retaining ring and a retaining fixing ring, the retaining ring and the retaining fixing ring are arranged on the downstream portion of the piston in a sleeving mode and located in the cavity, the retaining fixing ring is located on the downstream portion of the retaining ring, and a setting pin is arranged on the retaining fixing ring; the self-sealing rubber sleeve assembly comprises a plurality of self-sealing rubber sleeves which are connected in series and arranged on an extension pipe in a sleeving mode, the extension pipe is arranged at the downstream tail end of the packer body in a sleeving mode, the upstream end of the extension pipe is further slidably sleeved with a push cylinder, the downstream end of the push cylinder is connected with the self-sealing rubber sleeves, and the upstream end of the push cylinder is connected with a piston cap. The piston cap is arranged on the packer body in a sliding and sleeving mode, located at the downstream tail end of the piston and connected with the retaining fixing ring in an abutting mode in good time.

Description

Technical Field

[0001] The invention relates to a water control well completion open hole packer and a setting tool and method thereof, belonging to the technical field of petroleum drilling equipment. Background Art

[0002] During the exploitation of oil fields, the influence of water layers is inevitable. Most oil wells have a short water-free production period and a rapid increase in water content. By effectively controlling the flow of formation water, the invasion of water into oil wells can be reduced and crude oil production can be increased. As an important water control technology, open hole packers play an important role in offshore oil well exploitation. Using packers to isolate well sections can effectively control the flow of formation water in the wellbore, thereby reducing the risk of flooding the entire production layer at the water production end.

[0003] At present, the open hole packer commonly used on site adopts the self-expansion sealing process, which is the simplest method. However, the self-expansion open hole packer takes a long time to set, and the sealing pressure after setting is low, and the sealing effect is difficult to ensure, so it has its own application disadvantages; the hydraulic compression setting process is more reliable, and the hydraulic mechanical action is used to ensure the open hole packer, and it has a high pressure resistance. Its setting process is simple and complex according to different application occasions. The simple pipe string does not have a screen or a perforated pipe, and can be directly pressurized and set at one time, and then the sliding sleeve is opened for production, while the one with a screen and perforated pipe needs to set the packer layer by layer, and the process is more complicated. Summary of the invention

[0004] In view of the above technical problems, the present invention provides a water control completion open hole packer and its setting tool and method. The packer is suitable for the isolation of open hole wells, especially for the isolation of irregular wellbores and open hole wells with large wellbore expansion rates. Compared with ordinary open hole packers, the packer of the present invention has higher pressure resistance after the open hole is expanded and sealed, can seal open holes of larger sizes, can seal irregular open holes, and has a wider range of applications. The setting method of the present invention can be applied to the completion method with a water control screen, and can achieve the one-time setting of all open hole packers, simplifying the operation process and improving the efficiency of on-site operations.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A water control completion open hole packer, comprising:

[0007] The piston movement mechanism comprises a packer body and a cylinder sleeve, wherein the cylinder sleeve is sleeved on the packer body with a cavity left between the two, a piston is arranged in the cavity, and a pressure transmission through hole communicating with the cavity is arranged on the packer body;

[0008] The piston stop mechanism comprises a stop ring and a stop fixing ring, both of which are sleeved downstream of the piston and located in the cavity, the stop fixing ring is located downstream of the stop ring, and a sealing pin is arranged on the stop fixing ring;

[0009] The self-sealing rubber cylinder assembly includes a plurality of self-sealing rubber cylinders, wherein the plurality of self-sealing rubber cylinders are serially sleeved on an extension tube, wherein the extension tube is sleeved on the downstream end of the packer body, and the upstream end of the extension tube is also slidably sleeved with a push cylinder, wherein the downstream end of the push cylinder is connected to the self-sealing rubber cylinder, and the upstream end of the push cylinder is connected to a piston cap, wherein the piston cap is slidably sleeved on the packer body and is located at the downstream end of the piston, and abuts against the retaining ring in due time.

[0010] In the water control completion open hole packer, preferably, the outer wall surface of the piston is provided with threads, the inner wall surface of the stop ring is also provided with threads, and the stop ring is connected to the cylinder sleeve through threads.

[0011] In the water control completion open hole packer, preferably, the self-sealing rubber tube assembly further comprises two rubber tube shoulder guards, and the two rubber tube shoulder guards are respectively sleeved on both ends of the self-sealing rubber tube.

[0012] In the water control completion open hole packer, preferably, the self-sealing rubber tube assembly further comprises a plurality of spacer rings, and the plurality of spacer rings are sleeved between two adjacent self-sealing rubber tubes.

[0013] In the water control completion open hole packer, preferably, a groove is provided on the side of the self-sealing rubber sleeve that contacts the extension tube; and / or,

[0014] The self-sealing rubber cylinder is provided with radial holes.

[0015] A second aspect of the present invention provides a well setting and completion tool, comprising any one of the above-mentioned water control completion open hole packers, and further comprising:

[0016] An outer pipe string, the outer pipe string comprises a blind pipe, a plurality of AICD water control screens are sleeved at intervals on the outer wall of the blind pipe, an open hole packer is sleeved between adjacent AICD water control screens, and a well washing guide shoe is provided at the forward end of the blind pipe;

[0017] The inner pipe string comprises a drill pipe, and the drill pipe comprises a central pipe, a circulation hole short section and a round plug which are connected in series in sequence.

[0018] The setting and completion tool is preferably: a top packer is sleeved on the outer wall of the upstream end of the blind pipe, a top packer sealing cylinder is sleeved on the inner wall, and a well washing sealing cylinder is sleeved on the inner wall of the downstream end of the blind pipe.

[0019] The setting and completion tool is preferably provided with a top packer service tool and an upper isolation seal on the outer wall of the upstream end of the drill pipe.

[0020] For the well setting and completion tool, preferably, a well-washing isolation seal is sleeved on the outer wall of the downstream end of the drill pipe, and a lower isolation seal is sleeved on the outer wall of the circulation hole pup joint.

[0021] A third aspect of the present invention provides an operating method for setting and completing a well, comprising the following steps:

[0022] After the outer pipe string is connected with the inner pipe string, the drill pipe is sent to a predetermined position underground. After the outer pipe string and the inner pipe string are put into place, the top packer service tool is connected with the top packer and kept in a locked state. The well washing isolation seal is located in the well washing sealing cylinder. The circulation hole of the circulation hole short joint is located at the lower end of the well washing sealing cylinder. The well washing guide shoe can be opened for circulation under the action of positive pressure. The well washing guide shoe is reversely closed. Liquid is injected into the inner pipe string under pressure. The liquid circulates from the inner pipe string to the annulus between the open hole packer and the outer pipe string to perform gel breaking circulation well washing and remove the wellbore mud cake.

[0023] The sealing ball is dropped into the top packer service tool, the inner pipe string is pressurized to seal and hang the top packer, and then the hands-off service tool is pressed to separate the inner pipe string from the outer pipe string, and the ball seat is pressed to be removed, and the ball seat falls on the ball catcher of the hands-off service tool, which does not affect the injection circulation in the inner pipe string and the outer pipe string;

[0024] The inner pipe string is lifted, the upper isolation seal enters the top packer sealing cylinder, and the lower isolation seal enters the well washing sealing cylinder. At this time, under the joint action of the outer pipe string, the upper isolation seal and the lower isolation seal, the outer pipe string forms a closed state from the inside to the open hole annulus, and the liquid injected into the circulation hole of the circulation hole short joint cannot enter the formation through the AICD water control screen. Pressurizing the inner pipe string can hold pressure in the outer pipe string, thereby sealing multiple open hole packers. Pressurizing the inner pipe string, the open hole packers expand and seal to the wellbore under the action of hydraulic pressure, and all the open hole packers are sealed at one time. After the pressure is relieved, the open hole packers remain in the sealed state.

[0025] After the open hole packer is set, the inner pipe string can be pulled out and the operation is completed.

[0026] The present invention adopts the above technical solution, which has the following advantages:

[0027] 1. The existing self-sealing rubber tube expands by absorbing oil or water or oil-water mixture or other liquid materials. When the open hole expansion rate is large, it is possible that the expansion is not in place. Even if it is expanded to the right place, the rubber strength is low and the pressure resistance is weak. The compression type self-sealing rubber tube packer of the present invention can expand and seal the rubber tube to the well wall through mechanical compression. The rubber has high strength and strong pressure resistance, and its pressure resistance is further enhanced by self-expansion.

[0028] 2. Ordinary compression packers are difficult to be used in open holes with large borehole expansion rates after mechanical compression, and it is difficult to achieve sealing for irregular open holes after compression. However, the compression self-sealing rubber cartridge packer (i.e., water control completion open hole packer) of the present invention can automatically fill the irregular wellbore with its self-sealing characteristics to achieve sealing if the open hole diameter is irregular after compression and expansion.

[0029] 3. The sealing tool of the present invention can efficiently seal multiple open hole packers at one time through the coordinated action of the completion water control outer pipe string and the service inner pipe string, which can save operation time on site, improve operation safety, and improve operation efficiency. The matching compression self-sealing rubber tube packer (i.e.: water control completion open hole packer) can effectively solve the sealing problem of compression packers in wellbores with large wellbore expansion rates, and can effectively solve the pressure resistance problem of self-sealing rubber packers, and has a large application range. The open hole packer and the sealing tool have broad application prospects in water control completion applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of a water control completion open hole packer provided in one embodiment of the present invention;

[0031] Figure 2 A schematic diagram of a piston movement mechanism in a packer provided in this embodiment of the present invention;

[0032] Figure 3 A schematic diagram of a piston stop mechanism in a packer provided in this embodiment of the present invention;

[0033] Figure 4 A schematic diagram of a self-sealing rubber cartridge assembly in a packer provided in this embodiment of the present invention;

[0034] Figure 5 A schematic diagram of the state of the packer provided by the embodiment of the present invention after setting is completed;

[0035] Figure 6 The sealing comparison diagrams of the existing self-sealing rubber cartridge and the compression type self-sealing rubber cartridge of the present invention are shown in Figure a, wherein Figure a is a sealing state diagram of the existing self-sealing rubber cartridge after mechanical compression, and Figure b is a self-sealing state diagram of the compression type self-sealing rubber cartridge of the present invention after mechanical compression when encountering well fluid;

[0036] Figure 7 The sealing comparison diagrams of the existing common compression packer and the compression type self-sealing rubber cartridge packer of the present invention on the irregular well wall are shown in FIG. a, wherein FIG. b is a sealing schematic diagram of the compression type self-sealing rubber cartridge packer of the present invention on the irregular well wall;

[0037] Figure 8 A schematic diagram of a setting and completion tool provided in one embodiment of the present invention;

[0038] Fig. 9 A production status diagram after the setting and completion tool operation provided by this embodiment of the present invention is completed;

[0039] Fig.10 A schematic diagram of the setting and completion tool provided in this embodiment of the present invention after being lowered into the well, breaking the gel and circulating the well to wash the well and remove the mud cake in the wellbore;

[0040] Fig.11 A schematic diagram of the setting completion tool provided in this embodiment of the present invention, after the wellbore mud cake is cleared, the setting ball is dropped to separate the inner tubing string from the outer tubing string;

[0041] Fig.12 A schematic diagram of setting all open hole packers at one time provided by the embodiment of the present invention, wherein the open hole packers remain in the set state after pressure relief;

[0042] Fig.13 A schematic diagram showing that after the open hole packer provided in this embodiment of the present invention is set, the inner pipe string is pulled out and the operation is completed;

[0043] The reference numerals in the figures are as follows:

[0044] 1-Packer body; 2-Piston; 3-Cylinder sleeve; 4-Retaining ring; 5-Retaining ring; 6-Setting pin; 7-Piston cap; 8-Push cylinder; 9-Extension pipe; 10-Rubber sleeve shoulder; 11-Self-sealing rubber sleeve; 12-Spacer ring; 13-Lower joint; 14-Isolated casing or wellbore; 15-Pipe string connected to the packer; 16-Irregular well wall; 17-Ordinary compression rubber; 18-Self-expanding rubber; 19- Top packer; 20-top packer sealing cylinder; 21-blind pipe; 22-wellbore; 23-open hole packer; 24-AICD water control screen; 25-well washing sealing cylinder; 26-well washing guide shoe; 27-drill pipe; 28-top packer service tool; 29-upper isolation seal; 30-center pipe; 31-well washing isolation seal; 32-lower isolation seal; 33-circulation hole short section; 34-round plug. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work are within the scope of protection of the present invention.

[0046] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second", "third", "fourth" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0047] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inner side", "outer side", "below", "above", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0048] At present, the open hole packer commonly used on site adopts the self-expansion sealing process, which is the simplest method. However, the self-expansion open hole packer takes a long time to set, and the sealing pressure after setting is low, and the sealing effect is difficult to ensure, so it has its own application disadvantages; the hydraulic compression setting process is more reliable, and the hydraulic mechanical action is used to ensure the open hole packer, and it has a high pressure resistance. Its setting process is simple and complex according to different application occasions. The simple pipe string does not have a screen or a perforated pipe, and can be directly pressurized and set at one time, and then the sliding sleeve is opened for production, while the one with a screen and perforated pipe needs to set the packer layer by layer, and the process is more complicated.

[0049] Based on the above technical problems, the present invention provides a water control completion open hole packer and a sealing method thereof. The packer is suitable for sealing open hole wells, especially for sealing irregular wellbores and open hole wells with large wellbore expansion rates. Compared with ordinary open hole packers, the packer of the present invention has higher pressure resistance after the open hole is expanded and sealed, can seal open holes of larger sizes, can seal irregular open holes, and has a wider range of applications. The sealing method of the present invention can be applied to the completion method with a water control screen, and can realize the one-time sealing of all open hole packers, simplifying the operation process and improving the efficiency of on-site operations.

[0050] like Figure 1-5 As shown, the water control completion open hole packer involved in the present invention comprises:

[0051] The piston movement mechanism includes a packer body 1 and a cylinder sleeve 3. The cylinder sleeve 3 is sleeved on the packer body 1 with a cavity between the two. A piston 2 is arranged in the cavity. The packer body 1 is provided with a pressure transmission hole connected to the cavity (after the packer body 1 is pressurized by the service tool, the pressure acts on the left end face of the piston 2 to push the piston 2 to move. The movement of the piston 2 will shear the sealing pin 6, and the hydraulic pressure is converted into a mechanical thrust for the packer to move); the piston stop mechanism includes a stop ring 4 and a stop fixing ring 5, which are sleeved downstream of the piston 2 and located in the cavity. In the figure, the anti-retreat fixing ring 5 is located downstream of the anti-retreat ring 4, and a sealing pin 7 is arranged on the anti-retreat fixing ring 5; the self-sealing rubber tube assembly includes a plurality of self-sealing rubber tubes 11, and the plurality of self-sealing rubber tubes 11 are serially sleeved on the extension tube 9, and the extension tube 9 is sleeved on the downstream end of the packer body 1, and the upstream end of the extension tube 9 is also slidably sleeved with a push tube 8, and the downstream end of the push tube 8 is connected to the self-sealing rubber tube 11, and the upstream end of the push tube 8 is connected to the piston cap 7, and the piston cap 7 is slidably sleeved on the packer body 1 and is located at the downstream end of the piston 2, and abuts against the anti-retreat fixing ring 5 in a timely manner.

[0052] Furthermore, if Figure 2 , 3 As shown, the outer wall surface of the piston 2 is provided with a thread, the inner wall surface of the backstop ring 4 is also provided with a thread, and the backstop fixing ring 5 is connected to the cylinder sleeve 3 by a thread. Affected by the thread direction of the backstop ring 4, the piston 2 can only move in one direction during movement, and the reverse direction movement is restricted. When the piston 2 moves to the final position, the backstop ring 4 locks the position of the piston 2 through a thread. The backstop fixing ring 5 is connected to the cylinder sleeve 3 by a thread, limiting the movement of the backstop ring 4.

[0053] Furthermore, if Figure 4As shown, the self-sealing rubber tube assembly also includes two rubber tube shoulder guards 10, which are respectively sleeved at both ends of the self-sealing rubber tube 11. The self-sealing rubber tube assembly also includes a plurality of spacer rings 12, which are sleeved between two adjacent self-sealing rubber tubes 11. Preferably, a groove is provided on the side of the self-sealing rubber tube 11 that contacts the extension tube 9; and a radial hole is provided on the self-sealing rubber tube 11.

[0054] like Figure 4 As shown, the present invention takes three rubber cylinders as an example. The rubber cylinder shoulder guard 10 is a relatively thin metal ring with partial wire cutting, which has a certain expansibility. During the rubber expansion sealing process, the rubber cylinder shoulder guard 10 has a certain deformation, which can assist the self-sealing rubber cylinder 11 in expansion and sealing, and improve the pressure resistance of the self-sealing rubber cylinder 11 after expansion. The spacer ring 12 helps the self-sealing rubber cylinder 11 to expand and seal according to the preset expansion and sealing effect during the extrusion process, and prevents the self-sealing rubber cylinder 11 from flanging and misalignment. The self-sealing rubber cylinder 11 can automatically expand and seal the wellbore annulus in the liquid environment of the wellbore. Structurally, the self-expanding rubber cylinder has a slot inside, and a small hole is opened in the middle of the rubber cylinder, so that the rubber cylinder can be expanded and sealed according to the designed expansion and sealing shape.

[0055] The self-sealing rubber tube 11 of the present invention (the rubber of the self-sealing rubber tube 11 is a known rubber) is made of a material that can absorb oil or water or a mixture of oil and water or other liquids. When in use, the inner pipe column is used to pressurize the packer, and the hydraulic pressure pushes the piston 2, and the piston 2 pushes the self-sealing rubber tube 11 to expand and seal the annulus between the outer pipe column and the open hole. After the self-sealing rubber tube 11 is compressed into place, due to the action of the packer stop ring 4, the self-sealing rubber tube 11 always maintains a compressed and expanded state. In addition, for wells with a large wellbore expansion rate or a wellbore with an irregular wellbore diameter, the self-seal can further expand by absorbing the liquid in the wellbore to seal a larger wellbore or an irregular wellbore.

[0056] like Figure 8 As shown, the present invention also relates to a sealing completion tool, including the above-mentioned water control completion open hole packer, and also includes: an outer pipe string, the outer pipe string includes a blind pipe 21, a plurality of AICD water control screens 24 are sleeved on the outer wall of the blind pipe 21 at intervals, an open hole packer 23 is sleeved between adjacent AICD water control screens 24, and a well washing guide shoe 26 is provided at the forward end of the blind pipe 21; an inner pipe string, the inner pipe string includes a drill pipe 27, and the drill pipe 27 includes a center pipe 30, a circulation hole short section 33 and a round plug 34 connected in series in sequence.

[0057] In some preferred embodiments of the present invention, Figure 8 As shown, a top packer 19 is sleeved on the outer wall of the upstream end of the blind pipe 21, and a top packer sealing cylinder 20 is sleeved on the inner wall. A well washing sealing cylinder 25 is sleeved on the inner wall of the downstream end of the blind pipe 21.

[0058] Furthermore, a top packer service tool 28 and an upper isolation seal 29 are sleeved on the outer wall of the upstream end of the drill pipe 27. A well washing isolation seal 31 is sleeved on the outer wall of the downstream end of the drill pipe 27, and a lower isolation seal 32 is sleeved on the outer wall of the circulation hole short section 33.

[0059] The sealing and completion tool provided by the present invention includes an outer tubular column with segmented water control and sand prevention functions and an inner tubular column for sealing the packers. After the outer tubular column and the inner tubular column are connected at the wellhead, they are sent to the designated position underground by a drill pipe 27. After they are in place, the sealing of all the packers on the outer tubular column is completed through hydraulic and mechanical actions. This completion process can realize the sealing of multiple open hole packers 23 at one time. Compared with sealing multiple open hole packers 23 one by one, sealing multiple open hole packers 23 at one time has extremely high timeliness and safety.

[0060] like Figure 10-13 As shown, the present invention also relates to an operating method of a sealing completion tool, comprising the following steps:

[0061] After the outer pipe string is connected to the inner pipe string, the drill pipe 27 is sent to the predetermined position underground. After the outer pipe string and the inner pipe string are put into place, the top packer service tool 28 is connected to the top packer 19 and kept locked. The well washing isolation seal 31 is located in the well washing sealing cylinder 25. The circulation hole of the circulation hole short section 33 is located at the lower end of the well washing sealing cylinder 25. The well washing guide shoe 26 can be opened for circulation under the action of positive pressure. The well washing guide shoe 26 is reversely closed. The inner pipe string is pressurized and injected with liquid. The liquid circulates from the inner pipe string to the annulus between the open hole packer 23 and the outer pipe string to perform gel breaking circulation and well washing to remove the mud cake in the wellbore. Fig.10 As shown;

[0062] The sealing ball is dropped into the top packer service tool 28, and the inner string is pressurized to seal and hang the top packer 19, and then the release service tool is pressed to separate the inner string from the outer string, and the ball seat is pressed to be released, and the ball seat falls on the ball catcher of the release service tool, which does not affect the injection circulation in the inner string and the outer string. Fig.11 As shown;

[0063] The inner tubing string is lifted, and the upper isolation seal 29 enters the top packer sealing tube 20, and the lower isolation seal 32 enters the well washing sealing tube 25. At this time, under the joint action of the outer tubing string, the upper isolation seal 29 and the lower isolation seal 32, the outer tubing string forms a closed state from the inside to the open hole annulus, and the liquid injected into the circulation hole of the circulation hole short section 33 cannot enter the formation through the AICD water control screen 24. Pressurizing the inner tubing string can hold pressure in the outer tubing string, thereby sealing multiple open hole packers 23. Pressurizing the inner tubing string, the open hole packers 23 are expanded and sealed to the wellbore under the action of hydraulic pressure, and all the open hole packers 23 are sealed at one time. After the pressure is relieved, the open hole packers 23 remain in the sealed state. Fig.12 As shown;

[0064] After the open hole packer 23 is set, the inner pipe string can be pulled out and the operation is completed. Fig.13 shown.

[0065] like Fig. 9 As shown, it is the production status after the operation is completed: the formation fluid is isolated by the open hole packer 23, enters the AICD water control screen 24 or AICD short joint from each section, enters the screen from the AICD valve, and flows out of the wellbore to the wellhead.

[0066] like Figure 5 As shown, the working principle of the open hole packer 23 is as follows:

[0067] The fluid inside the open hole packer 23 is pressurized, and the fluid transmits the pressure to the piston 2 through the pressure transmission hole on the packer body 1 and the through hole. The hydraulic pressure is converted into mechanical thrust after the piston 2 moves. When the piston 2 moves, the sealing pin 6 is sheared. Under the continuous action of the hydraulic pressure, the piston 2, the piston cap 7, and the push cylinder 8 move in the direction of the self-sealing rubber tube 11, push and squeeze the self-sealing rubber tube 11, and the self-sealing rubber tube 11 expands and seals the wellbore under the action of mechanical force, so as to achieve the purpose of sealing the annulus of the packer. After the pressure is relieved, when the piston 2 moves to the final position, it is affected by the thread direction of the stop ring 4, and the reverse movement of the piston 2 is restricted. The stop ring 4 locks the position of the piston 2 through the thread, and the packer always maintains the sealing state. Under the liquid environment conditions of the wellbore, the self-sealing rubber tube 11 can achieve further expansion after a few days of immersion, can seal irregular wellbores, and can further enhance the pressure resistance.

[0068] like Figure 6 As shown, FIG. a is an existing self-sealing rubber tube, which expands by absorbing oil or water or oil-water mixture or other liquid materials. When the open hole expansion rate is large, it is possible that the rubber may not expand to the proper position. Even after the expansion is in place, the rubber strength is low and the pressure resistance is weak. The compression type self-sealing rubber tube packer of the present invention can expand and seal the rubber tube to the well wall through mechanical compression. The rubber has high strength and strong pressure resistance. Then, through self-expansion, its pressure resistance is further enhanced, as shown in FIG. b.

[0069] like Figure 7 As shown in the figure, FIG. a is a common compression packer, which is difficult to be used in open holes with large borehole expansion rate after mechanical compression, and it is difficult to achieve sealing for irregular open holes after compression. As shown in FIG. b, the compression type self-sealing rubber cartridge packer of the present invention, after compression and expansion, if the open hole diameter is irregular, the self-sealing rubber cartridge can use its self-sealing characteristics to automatically fill the irregular wellbore and achieve sealing.

[0070] The water control completion open hole packer and its setting tool of the present invention can efficiently set multiple open hole packers 23 at one time through the coordinated action of the completion water control outer pipe string and the service inner pipe string, which can save operation time on site, improve operation safety, and improve operation efficiency. The matching compression self-sealing rubber tube packer (i.e., open hole packer 23) can effectively solve the sealing problem of compression packers in wellbores with large wellbore expansion rates, and can effectively solve the pressure resistance problem of self-sealing rubber packers, and has a large application range. The open hole packer 23 and its setting tool have broad application prospects in water control completion applications.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water control completion open hole packer, characterized in that: include: The piston movement mechanism comprises a packer body (1) and a cylinder sleeve (3), wherein the cylinder sleeve (3) is sleeved on the packer body (1) with a cavity left between the two, a piston (2) is arranged in the cavity, and a pressure transmission through hole communicating with the cavity is arranged on the packer body (1); The piston stop mechanism comprises a stop ring (4) and a stop fixing ring (5), both of which are sleeved downstream of the piston (2) and located in the cavity, the stop fixing ring (5) is located downstream of the stop ring (4), and a setting pin (7) is provided on the stop fixing ring (5); A self-sealing rubber cylinder assembly comprises a plurality of self-sealing rubber cylinders (11), wherein the plurality of self-sealing rubber cylinders (11) are serially sleeved on an extension tube (9), wherein the extension tube (9) is sleeved on the downstream end of the packer body (1), and the upstream end of the extension tube (9) is also slidably sleeved with a push cylinder (8), wherein the downstream end of the push cylinder (8) is connected to the self-sealing rubber cylinder (11), and the upstream end of the push cylinder (8) is connected to a piston cap (7), wherein the piston cap (7) is slidably sleeved on the packer body (1) and is located at the downstream end of the piston (2), and abuts against the retaining ring (5) in due course.

2. The water control completion open hole packer according to claim 1, characterized in that: The outer wall surface of the piston (2) is provided with a thread, the inner wall surface of the stop ring (4) is also provided with a thread, and the stop ring (5) is connected to the cylinder sleeve (3) through a thread.

3. The water control completion open hole packer according to claim 1, characterized in that: The self-sealing rubber cylinder assembly further comprises two rubber cylinder shoulder guards (10), and the two rubber cylinder shoulder guards (10) are respectively sleeved on the two ends of the self-sealing rubber cylinder (11).

4. The water control completion open hole packer according to claim 1, characterized in that: The self-sealing rubber cylinder assembly further comprises a plurality of spacer rings (12), wherein the plurality of spacer rings (12) are sleeved between two adjacent self-sealing rubber cylinders (11).

5. The water control completion open hole packer according to claim 1, characterized in that: A groove is provided on the side of the self-sealing rubber sleeve (11) that contacts the extension tube (9); and / or, The self-sealing rubber cylinder (11) is provided with radial holes.

6. A well completion tool, comprising the water control completion open hole packer according to any one of claims 1 to 5, characterized in that: Also includes: An outer pipe column, the outer pipe column comprising a blind pipe (21), a plurality of AICD water control screens (24) are sleeved on the outer wall of the blind pipe (21) at intervals, an open hole packer (23) is sleeved between adjacent AICD water control screens (24), and a well washing guide shoe (26) is provided at the forward end of the blind pipe (21); An inner pipe string, the inner pipe string comprises a drill pipe (27), the drill pipe (27) comprises a central pipe (30), a circulation hole short section (33) and a round plug (34) which are sequentially connected in series.

7. The setting and completion tool according to claim 6, characterized in that: A top packer (19) is sleeved on the outer wall of the upstream end of the blind pipe (21), and a top packer sealing cylinder (20) is sleeved on the inner wall. A well-washing sealing cylinder (25) is sleeved on the inner wall of the downstream end of the blind pipe (21).

8. The setting and completion tool according to claim 7, characterized in that: A top packer service tool (28) and an upper isolation seal (29) are sleeved on the outer wall of the upstream end of the drill pipe (27).

9. The setting and completion tool according to claim 8, characterized in that: A well-washing isolation seal (31) is sleeved on the outer wall of the downstream end of the drill pipe (27), and a lower isolation seal (32) is sleeved on the outer wall of the circulation hole short section (33).

10. An operating method of the setting completion tool according to claim 9, characterized in that: The steps include: After the outer pipe string is connected to the inner pipe string, the drill pipe (27) is sent to a predetermined position underground. After the outer pipe string and the inner pipe string are lowered into place, the top packer service tool (28) is connected to the top packer (19) and kept in a locked state. The well washing isolation seal (31) is located in the well washing sealing cylinder (25). The circulation hole of the circulation hole short section (33) is located at the lower end of the well washing sealing cylinder (25). The well washing guide shoe (26) can be opened for circulation under the action of positive pressure. The well washing guide shoe (26) is reversely closed. The inner pipe string is pressurized and injected with liquid. The liquid circulates from the inner pipe string to the annulus between the open hole packer (23) and the outer pipe string to perform gel breaking circulation and well washing to remove the mud cake in the wellbore. The sealing ball is dropped into the top packer service tool (28), the inner pipe string is pressurized to seal and hang the top packer (19), and then the hands-off service tool is pressed to separate the inner pipe string from the outer pipe string, and the ball seat is pressed to be released, and the ball seat falls on the ball catcher of the hands-off service tool, without affecting the injection circulation in the inner pipe string and the outer pipe string; The inner pipe string is lifted, the upper isolation seal (29) enters the top packer sealing tube (20), and the lower isolation seal (32) enters the well washing sealing tube (25). At this time, under the joint action of the outer pipe string, the upper isolation seal (29) and the lower isolation seal (32), the outer pipe string forms a closed state from the inside to the open hole annulus, and the liquid injected into the circulation hole of the circulation hole short joint (33) cannot enter the formation through the AICD water control screen (24). Pressurizing the inner pipe string can build up pressure in the outer pipe string, thereby sealing multiple open hole packers (23). Pressurizing the inner pipe string, the open hole packers (23) are expanded and sealed to the wellbore under the action of hydraulic pressure, and all the open hole packers (23) are sealed at one time. After the pressure is released, the open hole packers (23) remain in the sealed state. After the open hole packer (23) is set, the inner pipe string can be pulled out and the operation is completed.

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