Well washing and sealing integrated tool and washable tubing string using the tool

Abstract

The application provides a well washing and packer integrated tool and a washable oil casing separate injection pipe column using the tool, and the well washing and packer integrated tool comprises an upper joint, a normal well washing device and a packer; the normal well washing device comprises an inner central pipe, an outer sleeve, an inner sleeve, a normal well washing piston and an elastic member, a first annular space is formed between the outer sleeve and the inner central pipe, and a liquid discharge hole is arranged on the outer sleeve; a second annular space is formed between the inner sleeve and the outer sleeve, a third annular space is formed between the inner sleeve and the inner central pipe, and a liquid inlet hole, a liquid outlet hole and a ball seat are arranged on the inner central pipe; the normal well washing piston is arranged between the inner central pipe and the inner sleeve and has an upper position and a lower position; when the normal well washing piston is in the upper position, the inner and outer well washing channels are closed, and when the normal well washing piston is in the lower position, the inner and outer well washing channels are opened. The well washing device and the packer are integrated, a ball is thrown from the well mouth, the oil pipe injects the well washing fluid, the inner and outer well washing channels are opened, and the whole well section is washed. After the ball is fished out, separate layer water injection can be realized, and the application is very convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil casing separate injection pipe column, in particular to a well washing and isolation integrated tool and a washable well washing oil casing separate injection pipe column using the tool. BACKGROUND

[0002] The current oil casing separate injection pipe column is clamped by a packer between the upper oil layer and the lower oil layer, water is injected into the upper oil layer through the oil casing annular space, water is injected into the lower oil layer through the tubing string, and the oil casing separate injection is realized through the ground flow control, which has the advantage of high injection layer segment qualification rate and is widely used. However, after long-term water injection in the current oil casing separate injection well, scale and impurities will be deposited in the oil casing annular space, blocking the oil layer channel, and well washing is needed.

[0003] To this end, a constant pressure well washing device disclosed in a Chinese utility model patent with the authorization announcement No. CN205172486U is composed of a well washing valve and a fishable plug, wherein the well washing valve is composed of an upper joint, a sliding sleeve, an outer cylinder and a reset spring, the well washing valve is connected to the upper part of the packer of the oil casing separate injection pipe column, and the positive well washing is realized by putting in the fishable plug.

[0004] In addition, an oil casing separate injection well washing device disclosed in a Chinese invention patent application with the application publication No. CN105114018A is composed of an upper joint, a connecting cylinder, a lower joint, a spring inner tube, a spring, a reversing central tube, a sealing nipple and an elastic claw, the oil casing separate injection well washing device is connected to the upper part of the packer of the separate injection pipe column, the opening and closing of the oil casing separate injection device are realized by balling tubing pressure, and the well washing is realized.

[0005] Both of the above two types of well washing devices are installed on the packer, the liquid inlet channel of the pipe column below the packer is closed and the well washing channel of the well washing device is opened during well washing, so that the main channel is blocked, the well washing fluid cannot clean the oil casing annular space below the packer, and only the oil casing annular space above the well washing device can be washed, and the well section below the packer cannot be cleaned.

[0006] In addition, a washable injection packer disclosed in a Chinese utility model patent with the authorization announcement No. CN206144510U is composed of an upper joint, an outer central tube, an inner central tube, a rubber cylinder, a well washing piston, a well washing sleeve and a sealing gasket. During well washing, the tubing pressure is released, the well washing fluid is injected from the oil casing annular space, the well washing piston is pushed upward, the well washing channel is opened, the well washing fluid enters the oil casing annular space below the packer from the annular space between the well washing port of the well washing sleeve, the inner central tube and the outer central tube, enters the pipe column from the ball seat at the bottom of the pipe column, and returns from the wellhead. If this packer is used in the oil casing separate injection pipe column, the packer well washing channel will be opened when the oil casing annular space injects water into the upper oil layer, and the separate layer injection cannot be realized.

[0007] In summary, the well washing device in the prior art either realizes well washing of the oil sleeve annular space above the packer, and the well section below the packer cannot be cleaned, or although the well washing of the oil sleeve annular space below the packer can be realized, but the separate layer water injection cannot be realized, and the use is not convenient. SUMMARY

[0008] The present application aims to provide a well washing and packer integrated tool which can realize separate layer water injection and well washing of the oil sleeve annular space below the packer, and aims to provide a washable oil sleeve separate injection pipe column which can realize separate layer water injection and well washing of the oil sleeve annular space below the packer.

[0009] To achieve the above-mentioned purpose, the well washing and packer integrated tool in the present application adopts the following technical scheme:

[0010] The well washing and packer integrated tool comprises an upper joint, a positive well washing device and a packer.

[0011] The positive well washing device comprises:

[0012] An inner central pipe, the upper end of which is fixedly connected with the upper joint;

[0013] An outer sleeve, the upper end of which is fixedly connected with the upper joint, the outer sleeve is located outside the inner central pipe, a first annular space is formed between the upper part of the outer sleeve and the inner central pipe, and a drainage hole for connecting the first annular space and the oil sleeve annular space is arranged on the outer sleeve;

[0014] An inner sleeve, the lower end of which is fixedly connected with the inner central pipe, a second annular space is formed between the inner sleeve and the outer sleeve, a third annular space is formed between the inner sleeve and the inner central pipe, a liquid inlet hole and a liquid outlet hole which are in communication with the third annular space are arranged on the inner central pipe, the liquid inlet hole is located above the liquid outlet hole, and a ball seat is arranged on the inner wall of the inner central pipe between the liquid inlet hole and the liquid outlet hole;

[0015] A positive washing piston is arranged between the inner central pipe and the inner sleeve, the outer side wall of the positive washing piston is in sliding contact with the inner side wall of the inner sleeve, the upper end of the positive washing piston has a partition part for partitioning the first annular space and the second annular space, the lower end of the positive washing piston is provided with a protruding part which protrudes inward, and the protruding part is in sliding contact with the outer side wall of the inner central pipe;

[0016] An elastic member is arranged below the positive washing piston, so that the positive washing piston has an upper position and a lower position, when the positive washing piston is in the upper position, the partition part partitions the first annular space and the second annular space, the protruding part is located at a position corresponding to the ball seat, and the third annular space is partitioned; when the positive washing piston is in the lower position, the first annular space and the second annular space are in communication, the protruding part is located at a position corresponding to the liquid outlet hole, and the liquid inlet hole and the liquid outlet hole are in communication through the third annular space;

[0017] The packer comprises:

[0018] The lower central pipe is fixedly connected with the lower end of the inner central pipe at the upper end;

[0019] The outer central pipe is fixedly connected with the lower end of the outer sleeve at the upper end, a rubber sleeve is installed on the outer portion of the outer central pipe, the outer central pipe is located outside the lower central pipe and forms a fourth annular space between the lower central pipe, the upper end of the fourth annular space is communicated with the second annular space, and the lower end of the fourth annular space is used for being communicated with the oil jacket annular space below the rubber sleeve.

[0020] The beneficial effects of the above technical scheme are as follows: the third annular space is formed between the inner sleeve and the inner central pipe, the liquid inlet hole and the liquid outlet hole which are communicated with the third annular space are arranged on the inner central pipe, the ball seat is arranged on the inner wall of the inner central pipe at a position between the liquid inlet hole and the liquid outlet hole, the ball is put in when well washing is needed, the main passage of the inner central pipe is blocked by the ball, at this time, the inner well washing passage is formed through the upper joint, the inner hole of the inner central pipe, the liquid inlet hole, the third annular space, the liquid outlet hole and the inner hole of the lower central pipe, so that the well washing fluid can enter the oil jacket annular space below the packer through the inner well washing passage.

[0021] Meanwhile, the first annular space is formed between the upper portion of the outer sleeve and the inner central pipe, the liquid outlet hole which is used for being communicated with the first annular space and the oil jacket annular space is arranged on the outer sleeve, the second annular space is formed between the inner sleeve and the outer sleeve, the fourth annular space which is communicated with the second annular space is formed between the outer central pipe and the lower central pipe, the liquid outlet hole, the first annular space, the second annular space and the fourth annular space form the outer well washing passage, so that the well washing fluid in the oil jacket annular space below the packer can enter the oil jacket annular space above the packer through the outer well washing passage.

[0022] In addition, the positive washing piston has an upper position and a lower position, when normal layered water injection is performed, the positive washing piston is in the upper position, the partition part separates the first annular space and the second annular space, the outer well washing passage is in a closed state, meanwhile, the convex part is located at a position corresponding to the ball seat, the third annular space is separated, that is, the inner well washing passage is also in a closed state, water injection is performed from the casing and the oil pipe through ground flow control, so that layered water injection of the upper oil layer and the lower oil layer can be realized.

[0023] When well washing is needed, the ball is put in and the well washing fluid is introduced, the well washing fluid enters the third annular space through the liquid inlet hole, the positive washing piston is driven to descend to the lower position by compressing the elastic member, the first annular space and the second annular space are communicated, the outer well washing passage is opened, meanwhile, the liquid inlet hole and the liquid outlet hole are communicated through the third annular space, the inner well washing passage is opened, thereafter, the well washing fluid can enter the oil jacket annular space below the packer through the inner well washing passage, finally, the well washing fluid enters the oil jacket annular space above the packer from the outer well washing passage, so that the effect of positive circulation well washing is realized. That is, the well washing fluid can clean the oil jacket annular space below the packer and the oil jacket annular space above the packer.

[0024] Further, the inner central pipe comprises an upper central pipe and a washing central pipe threadedly connected below the upper central pipe, the first annular space is formed by the interval between the upper part of the outer sleeve and the upper central pipe, the third annular space is formed by the interval between the washing central pipe and the inner sleeve, and the liquid inlet hole, the liquid outlet hole and the ball seat are arranged on the washing central pipe.

[0025] The above technical solution has the beneficial effects that the machining and manufacturing of the inner central pipe are facilitated, and the machining of the liquid inlet hole, the liquid outlet hole and the ball seat is facilitated.

[0026] Further, the washing central pipe is in a stepped shape, the lower end of the washing central pipe is provided with a diameter-expanding section which expands outward, the upper end surface of the diameter-expanding section is in top pressing contact with the lower end of the elastic member, the lower end of the inner sleeve is threadedly connected with the outer side wall of the diameter-expanding section, and the lower central pipe of the packer is threadedly connected with the inner side wall of the diameter-expanding section.

[0027] The above technical solution has the beneficial effects that the elastic member is facilitated to be top-mounted, and the inner sleeve and the lower central pipe are facilitated to be fixedly connected with the washing central pipe.

[0028] Further, the lower end surface of the diameter-expanding section is a lower taper surface, the upper end surface of the outer central pipe is an upper taper surface which matches the inclination of the lower taper surface, and the upper taper surface and the lower taper surface form an inclined channel which communicates the second annular space and the fourth annular space.

[0029] The above technical solution has the beneficial effects that the second annular space and the fourth annular space are facilitated to be communicated.

[0030] Further, the upper central pipe is in a stepped shape and comprises an upper small-diameter section and a lower large-diameter section, the washing central pipe is threadedly connected with the inner side wall of the large-diameter section, and the upper part of the positive washing piston is clamped between the outer side wall of the large-diameter section and the inner sleeve.

[0031] The above technical solution has the beneficial effects that the washing central pipe is facilitated to be connected with the upper central pipe, the positive washing piston is facilitated to be arranged and installed, and the structure is simple.

[0032] Further, the outer sleeve comprises an upper outer sleeve and a lower outer sleeve which is threadedly connected with the upper outer sleeve, the liquid discharge hole is arranged on the upper outer sleeve, the second annular space is formed by the interval between the lower outer sleeve and the inner sleeve, and the outer central pipe is threadedly connected with the lower outer sleeve.

[0033] The above technical solution has the beneficial effects that the machining and manufacturing of the outer sleeve are facilitated.

[0034] Further, the inner hole of the upper outer sleeve is in a funnel shape which is large at the top and small at the bottom.

[0035] The above technical solution has the beneficial effects that the funnel-shaped inner hole has good buffering effect and facilitates liquid discharge.

[0036] Further, the inner wall of the outer sleeve is provided with an inner boss, when the washing piston is in the upper position, the upper end surface of the partition part is in contact with the lower end surface of the inner boss, and a sealing ring is arranged between the two.

[0037] The beneficial effects of the above technical solution are that the inner boss cooperates with the partition part, and a sealing ring is arranged between the two, which facilitates the partition of the first annular space and the second annular space when the washing piston is in the upper position.

[0038] Further, the hole diameter of the liquid outlet hole is larger than the hole diameter of the liquid inlet hole.

[0039] The beneficial effects of the above technical solution are that the protruding part is prevented from blocking the liquid outlet hole, and the liquid inlet hole and the liquid outlet hole are facilitated to be communicated through the third annular space.

[0040] To achieve the above-mentioned purposes, the washable well oil casing separate injection pipe column in the application adopts the following technical solutions:

[0041] The washable well oil casing separate injection pipe column comprises a tubing and a wash well and packer integrated tool connected to the tubing, and the wash well and packer integrated tool comprises an upper joint, a well washing device and a packer.

[0042] The well washing device comprises:

[0043] An inner central pipe is fixedly connected to the upper joint at the upper end;

[0044] An outer sleeve is fixedly connected to the upper joint at the upper end, the outer sleeve is located outside the inner central pipe, a first annular space is formed between the upper part of the outer sleeve and the inner central pipe, and a liquid discharge hole for communicating the first annular space and the oil casing annular space is arranged on the outer sleeve;

[0045] An inner sleeve is fixedly connected to the inner central pipe at the lower end, a second annular space is formed between the inner sleeve and the outer sleeve, a third annular space is formed between the inner sleeve and the inner central pipe, a liquid inlet hole and a liquid outlet hole are arranged on the inner central pipe and communicated with the third annular space, the liquid inlet hole is located above the liquid outlet hole, and a ball seat is arranged on the inner wall of the inner central pipe between the liquid inlet hole and the liquid outlet hole;

[0046] A washing piston is arranged between the inner central pipe and the inner sleeve, the outer side wall of the washing piston is in sliding contact with the inner side wall of the inner sleeve, the upper end of the washing piston is provided with a partition part for partitioning the first annular space and the second annular space, the lower end of the washing piston is provided with a protruding part protruding inward, and the protruding part is in sliding contact with the outer side wall of the inner central pipe.

[0047] The elastic member is arranged below the positive washing piston to make the positive washing piston have an upper position and a lower position, when the positive washing piston is in the upper position, the partition part separates the first annular space and the second annular space, the convex part is located in the position corresponding to the ball seat, and the third annular space is separated; when the positive washing piston is in the lower position, the first annular space and the second annular space are communicated, the convex part is located in the position corresponding to the liquid outlet hole, and the liquid inlet hole and the liquid outlet hole are communicated through the third annular space;

[0048] The packer comprises:

[0049] The lower central pipe is fixedly connected with the lower end of the inner central pipe at the upper end;

[0050] The outer central pipe is fixedly connected with the lower end of the outer sleeve at the upper end, the rubber sleeve is arranged on the outer portion of the outer central pipe, the outer central pipe is located outside the lower central pipe and forms a fourth annular space with the lower central pipe, the upper end of the fourth annular space is communicated with the second annular space, and the lower end of the fourth annular space is used for being communicated with the oil jacket annular space below the rubber sleeve.

[0051] The beneficial effects of the above technical scheme are as follows: the third annular space is formed between the inner sleeve and the inner central pipe, the liquid inlet hole and the liquid outlet hole which are communicated with the third annular space are arranged on the inner central pipe, the ball seat is arranged on the inner wall of the inner central pipe between the liquid inlet hole and the liquid outlet hole, the ball is put in when well washing is needed, the main channel of the inner central pipe is blocked by the ball, at this time, the inner well washing channel is formed through the upper joint, the inner hole of the inner central pipe, the liquid inlet hole, the third annular space, the liquid outlet hole and the inner pipe of the lower central pipe, so that the well washing fluid can enter the oil jacket annular space below the packer through the inner well washing channel.

[0052] Meanwhile, the first annular space is formed between the upper portion of the outer sleeve and the inner central pipe, the liquid outlet hole which is used for being communicated with the first annular space and the oil jacket annular space is arranged on the outer sleeve, the second annular space is formed between the inner sleeve and the outer sleeve, the fourth annular space which is communicated with the second annular space is formed between the outer central pipe and the lower central pipe, and the liquid outlet hole, the first annular space, the second annular space and the fourth annular space form the outer well washing channel, so that the well washing fluid in the oil jacket annular space below the packer can enter the oil jacket annular space above the packer upwardly through the outer well washing channel.

[0053] In addition, the positive washing piston has an upper position and a lower position, when normal layered water injection is needed, the positive washing piston is in the upper position, the partition part separates the first annular space and the second annular space, the outer well washing channel is in the closed state, meanwhile, the convex part is located in the position corresponding to the ball seat, the third annular space is separated, that is, the inner well washing channel is also in the closed state, and the water injection is realized through the surface flow process control from the casing and the tubing, so that the layered water injection of the upper oil layer and the lower oil layer can be realized.

[0054] When the well needs to be washed, the ball is thrown, and then the washing fluid is introduced, the washing fluid enters the third annular space through the liquid inlet hole, pushes the positive washing piston to compress the elastic element to move downward to the lower position, so that the first annular space and the second annular space are communicated, the outer washing channel is opened, and the liquid inlet hole and the liquid outlet hole are communicated through the third annular space, the inner washing channel is opened, and then the washing fluid can enter the annular space below the packer through the inner washing channel, and finally enter the annular space above the packer through the outer washing channel, so that the effect of positive circulation washing is realized. That is, the washing fluid can clean the annular space below the packer and the annular space above the packer.

[0055] Further, the inner central pipe includes an upper central pipe and a washing central pipe threadedly connected below the upper central pipe, the first annular space is formed by the interval between the upper part of the outer sleeve and the upper central pipe, the third annular space is formed by the interval between the washing central pipe and the inner sleeve, and the liquid inlet hole, the liquid outlet hole and the ball seat are arranged on the washing central pipe.

[0056] The beneficial effects of the above technical solution are that the machining and manufacturing of the inner central pipe are facilitated, and the machining of the liquid inlet hole, the liquid outlet hole and the ball seat is facilitated.

[0057] Further, the washing central pipe is in a stepped shape, the lower end of the washing central pipe is provided with a diameter-expanding section which expands outward, the upper end face of the diameter-expanding section is in top pressure contact with the lower end of the elastic element, the lower end of the inner sleeve is threadedly connected with the outer side wall of the diameter-expanding section, and the lower central pipe of the packer is threadedly connected with the inner side wall of the diameter-expanding section.

[0058] The beneficial effects of the above technical solution are that the elastic element is facilitated to be top-mounted, and the inner sleeve and the lower central pipe are facilitated to be fixedly connected with the washing central pipe.

[0059] Further, the lower end face of the diameter-expanding section is a lower taper face, the upper end face of the outer central pipe is an upper taper face which matches the inclination of the lower taper face, and the upper taper face and the lower taper face form an inclined channel which communicates the second annular space and the fourth annular space.

[0060] The beneficial effects of the above technical solution are that the second annular space and the fourth annular space are facilitated to be communicated.

[0061] Further, the upper central pipe is in a stepped shape and includes a small-diameter section at the upper side and a large-diameter section at the lower side, the washing central pipe is threadedly connected with the inner side wall of the large-diameter section, and the upper part of the positive washing piston is clamped between the outer side wall of the large-diameter section and the inner sleeve.

[0062] The beneficial effects of the above technical solution are that the washing central pipe is facilitated to be connected with the upper central pipe, the positive washing piston is facilitated to be arranged and installed, and the structure is simple.

[0063] Further, the outer sleeve comprises an upper outer sleeve and a lower outer sleeve threadedly connected with the upper outer sleeve, the liquid discharge hole is arranged on the upper outer sleeve, the second annular space is formed by the interval between the lower outer sleeve and the inner sleeve, and the outer central tube is threadedly connected with the lower outer sleeve.

[0064] The above technical solution has the beneficial effects that the processing and manufacturing of the outer sleeve are facilitated.

[0065] Further, the inner hole of the upper outer sleeve is funnel-shaped with the upper part being larger and the lower part being smaller.

[0066] The above technical solution has the beneficial effects that the funnel-shaped inner hole has good buffering effect and facilitates liquid discharge.

[0067] Further, an inner boss is protruded on the inner wall of the upper outer sleeve, when the positive washing piston is in the upper position, the upper end surface of the partition part is in abutting contact with the lower end surface of the inner boss, and a sealing ring is arranged between the two.

[0068] The above technical solution has the beneficial effects that the inner boss cooperates with the partition part, and a sealing ring is arranged between the two, so that the first annular space and the second annular space are separated when the positive washing piston is in the upper position.

[0069] Further, the hole diameter of the liquid outlet hole is larger than the hole diameter of the liquid inlet hole.

[0070] The above technical solution has the beneficial effects that the protruding part is prevented from blocking the liquid outlet hole, and the liquid inlet hole and the liquid outlet hole are communicated through the third annular space. BRIEF DESCRIPTION OF DRAWINGS

[0071] Figure 1 FIG. 1 is a structural schematic diagram of a well washing oil sleeve separate injection pipe column in the present application;

[0072] Figure 2 FIG. 2 is a structural diagram of a well washing and sealing integrated tool of the well washing oil sleeve separate injection pipe column in the present application;

[0073] Figure 3 FIG. 3 is an enlarged view of the upper part of the structure in FIG. 2; Figure 2

[0074] Figure 4 FIG. 4 is a well washing operation state diagram of the well washing and sealing integrated tool of the well washing oil sleeve separate injection pipe column in the present application.

[0075] ​In the figure: 1, oil pipe; 2, well flushing and packer integrated tool; 2-1, upper joint; 2-2, positive well flushing device; 2-21, upper sleeve; 2-211, liquid discharge hole; 2-22, upper central pipe; 2-23, first sealing ring; 2-24, positive flushing piston; 2-25, lower sleeve; 2-26, inner sleeve; 2-27, well flushing central pipe; 2-271, liquid inlet hole; 2-272, ball seat; 2-273, liquid outlet hole; 2-274, diameter expansion section; 2-28, second sealing ring; 2-29, third sealing ring; 2-210, spring; 2-3, packer; 2-31, rubber tube; 2-32, outer central pipe; 2-33, lower central pipe; 3, trumpet; 4, casing; 5, upper oil layer; 6, lower oil layer; 7, ball. DETAILED DESCRIPTION

[0076] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application, i.e., the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0077] Therefore, the detailed description of the embodiments of the present application provided below in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without making creative efforts fall within the scope of the present application.

[0078] It should be noted that the relational terms such as "first" and "second" and the like are only used to distinguish one entity or action from another entity or action, and do not necessarily require or imply that there is any such actual relationship or order between these entities or actions. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or equipment including the element.

[0079] The features and performances of the present application will be further described in detail below with reference to the embodiments.

[0080] Embodiment 1 of the well-flushable oil-casing separate injection pipe string in the present application is as follows Figure 1As shown, the well flushing and isolation integrated tool 2 is connected to the oil pipe 1. Figure 2 As shown, the well flushing and isolation integrated tool 2 includes an upper joint 2-1, a well flushing device 2-2, and a packer 2-3.

[0081] Specifically, the well flushing device 2 includes an inner central pipe and an outer sleeve located outside the inner central pipe, and the well flushing device 2 is connected to the upper joint 2-1. Figure 2 and Figure 3 As shown, the inner central pipe in the embodiment includes an upper central pipe 2-22 and a well flushing central pipe 2-27 threadedly connected below the upper central pipe 2-22, and the upper end of the upper central pipe 2-22 is threadedly connected to the inner sidewall of the upper joint 2-1. The upper central pipe 2-22 is stepped and includes an upper small-diameter section and a lower large-diameter section, and the well flushing central pipe 2-27 is threadedly connected to the inner sidewall of the large-diameter section.

[0082] The outer sleeve in the embodiment includes an upper outer sleeve 2-21 and a lower outer sleeve 2-25 threadedly connected to the upper outer sleeve 2-21, and the upper end of the upper outer sleeve 2-21 is threadedly connected to the outer sidewall of the upper joint 2-1. The space between the upper outer sleeve 2-21 and the upper central pipe 2-22 forms a first annular space, and the upper outer sleeve 2-21 is provided with a drainage hole 2-211 for communicating the first annular space and the oil jacket annular space. The inner wall of the upper outer sleeve 2-21 is provided with an inner boss, and the upper end surface of the inner boss is inclined, so that the inner hole of the upper outer sleeve 2-21 is funnel-shaped with a large diameter at the top and a small diameter at the bottom.

[0083] The well flushing device 2 further includes an inner sleeve 2-26, and the lower end of the inner sleeve 2-26 is threadedly connected to the well flushing central pipe 2-27. The space between the inner sleeve 2-26 and the lower outer sleeve 2-25 forms a second annular space, and the space between the inner sleeve 2-26 and the well flushing central pipe 2-27 forms a third annular space. The well flushing central pipe 2-27 is provided with a liquid inlet hole 2-271 and a liquid outlet hole 2-273 for communicating the third annular space, the liquid inlet hole 2-271 is located above the liquid outlet hole 2-273, and the hole diameter of the liquid outlet hole 2-273 is larger than that of the liquid inlet hole 2-271. The inner wall of the well flushing central pipe 2-27 is provided with a ball seat 2-272 at a position between the liquid inlet hole 2-271 and the liquid outlet hole 2-273, and the ball seat 2-272 is specifically a conical surface or an arc surface extending inwardly of the well flushing central pipe 2-27.

[0084] The positive washing device 2 further comprises a positive washing piston 2-24, which is a tubular structure, is arranged between the inner central pipe and the inner sleeve 2-26, and has an outer sidewall in sliding contact with an inner sidewall of the inner sleeve 2-26. An upper part of the positive washing piston 2-24 is clamped between an outer sidewall of the large-diameter section of the upper central pipe 2-22 and the inner sleeve 2-26, and a second sealing ring 2-28 is arranged between the positive washing piston 2-24 and the large-diameter section of the upper central pipe 2-22. The positive washing piston 2-24 has a partition portion at an upper end thereof for partitioning the first annular space and the second annular space, and has a protruding portion protruding inwardly at a lower end thereof, which is in sliding contact with an outer sidewall of the washing central pipe 2-27, and a third sealing ring 2-29 is arranged on a sliding contact surface of the protruding portion.

[0085] The positive washing device 2 further comprises an elastic member arranged below the positive washing piston 2-24, which is a spring 2-210 in the embodiment, and has an upper end in top pressure contact with a lower end surface of the positive washing piston 2-24. The washing central pipe 2-27 is in a stepped shape, and has an expanding section 2-274 expanding outwardly at a lower end thereof, and a lower end of the spring 2-210 is in top pressure contact with an upper end surface of the expanding section 2-274. In addition, a lower end of the inner sleeve 2-26 is threadedly connected with an outer sidewall of the expanding section 2-274.

[0086] The elastic member is arranged to make the positive washing piston 2-24 have an upper position and a lower position. When the positive washing piston 2-24 is in the upper position, the partition portion partitions the first annular space and the second annular space, the protruding portion is located at a position corresponding to the ball seat 2-272, and the third annular space is partitioned. When the positive washing piston 2-24 is in the lower position, the first annular space and the second annular space are communicated, the protruding portion is located at a position corresponding to the liquid outlet hole 2-273, and the liquid inlet hole 2-271 and the liquid outlet hole 2-273 are communicated through the third annular space. When the positive washing piston 2-24 is in the upper position, an upper end surface of the partition portion is in abutting contact with a lower end surface of the inner boss of the upper outer sleeve 2-21, and a first sealing ring 2-23 is arranged therebetween.

[0087] The packer 2-3 has the same structure as that in the prior art (such as the packer disclosed in the patent document CN206144510U), such as Figure 2 and Figure 4As shown, the packer 2-3 includes a lower central pipe 2-33 and an outer central pipe 2-32, the lower central pipe 2-33 is threadedly connected with the inner side wall of the enlarged diameter section 2-274, the outer central pipe 2-32 is threadedly connected with the lower end of the lower outer sleeve 2-25, the outer part of the outer central pipe 2-32 is provided with a rubber sleeve 2-31, the outer central pipe 2-32 is located outside the lower central pipe 2-33 and forms a fourth annular space between the lower central pipe 2-33, the upper end of the fourth annular space is communicated with the second annular space, and the lower end of the fourth annular space is used for communicating with the oil jacket annular space below the rubber sleeve 2-31, the communication mode of the lower end belongs to the prior art, which is the self-structure setting of the packer 2-3, and the present application will not be described in detail.

[0088] In addition, as shown in the drawings, Figures 2-4 As shown, the lower end face of the enlarged diameter section 2-274 is a lower tapered surface, the upper end face of the outer central pipe 2-32 is an upper tapered surface matched with the inclination of the lower tapered surface, and the upper tapered surface and the lower tapered surface form an inclined channel for communicating the second annular space and the fourth annular space.

[0089] In the well flushing and packer integrated tool 2 in the present application, the inner wall of the well flushing central pipe 2-27 is provided with a ball seat 2-272, when well flushing is needed, a ball is put in, the ball blocks the main channel of the well flushing central pipe 2-27, and an inner well flushing channel is formed through the upper joint 2-1, the upper central pipe 2-22, the inner hole of the well flushing central pipe 2-27, the liquid inlet hole 2-271, the third annular space, the liquid outlet hole 2-273 and the inner hole of the lower central pipe 2-33, so that the well flushing fluid can enter the oil jacket annular space below the packer through the inner well flushing channel. The liquid outlet hole 2-211, the first annular space, the second annular space and the fourth annular space form an outer well flushing channel, so that the well flushing fluid in the oil jacket annular space below the packer can enter the oil jacket annular space above the packer through the outer well flushing channel.

[0090] Therefore, the working principle of the well flushing oil jacket separate injection pipe column in the present application is as follows:

[0091] As shown in the drawings, Figures 1-3 As shown, the well flushing and packer integrated tool 2 in the present application is used to replace the packer in the prior art and is lowered into the injection well, the packer 2-3 in the well flushing and packer integrated tool 2 is set (the setting mode belongs to the prior art), the positive flushing piston 2-24 is in the upper position under the elastic force of the spring 2-210, the blocking part of the positive flushing piston 2-24 abuts against the inner boss of the upper outer sleeve 2-21, the first annular space and the second annular space are blocked, and the outer well flushing channel is in the closed state; at the same time, the protruding part of the positive flushing piston 2-24 is located at the position corresponding to the ball seat 2-272 (the position of the ball seat 2-272 is shown in the drawings). Figure 2 and Figure 3(As shown in the image), the third annular space is isolated, and the internal well-washing channel is also closed. Water can be injected from the casing 4 and tubing 1 through the surface process control, which can achieve 6-layer water injection of the upper oil layer 5 and the lower oil layer. Water can be injected into both oil layers at the same time, or water can be injected into any one of the oil layers that is the target of water injection.

[0092] When well cleaning is required, such as Figure 4 As shown, ball 7 is dropped into the wellhead and lands on ball seat 2-272, sealing the central through hole of the well-washing center tube 2-27. Then, well-washing fluid is injected through tubing 1. The well-washing fluid enters the third annular space through inlet hole 2-271, pushing the forward washing piston 2-24 downward to the lower position against the elastic force of spring 2-210. Inlet hole 2-271 and outlet hole 2-273 are connected through the third annular space, opening the inner well-washing channel. At the same time, the partition of the forward washing piston 2-24 leaves the inner boss of the upper outer sleeve 2-21, connecting the first and second annular spaces, opening the outer well-washing channel. The well-washing fluid flows downward from the inner well-washing channel into tubing 1 and bell mouth 3 below packer 2-3, then upwards into the annular space of the casing below packer 2-3, and then through the outer well-washing channel into the annular space of the casing above packer 2-3 (the flow direction of the well-washing fluid in the forward well-washing device is as follows). Figure 4 As shown in the figure, the water returns from the wellhead, achieving the effect of positive circulation well washing.

[0093] After the well washing is completed, the injection of washing fluid into tubing 1 is stopped. The forward washing piston 2-24 is pushed to the upper position under the elastic force of spring 2-210, the inner and outer well washing channels are closed, the well washing is completed, ball 7 is retrieved, and water injection can be resumed.

[0094] In summary, the integrated well-washing and packer tool of this invention integrates the well-washing device and the packer into one unit. By dropping a ball from the wellhead and injecting well-washing fluid into the tubing, the internal and external well-washing channels of the well-washing device are opened. This allows for cleaning of both the annular space below the packer and the annular space above the packer, achieving full-section well-washing. Furthermore, after retrieving the ball, the integrated well-washing and packer tool can also perform stratified water injection, making it extremely convenient to use.

[0095] Example 2 of the washable well casing injection string in this invention: Unlike Example 1, the diameter of the outlet hole is equal to the diameter of the inlet hole.

[0096] Example 3 of the washable well casing injection string in this invention: Unlike Example 1, the upper end face of the partition part does not abut against the lower end face of the inner boss, but achieves the separation of the first annular space and the second annular space through the sealing contact between the outer side wall of the partition part and the inner side wall of the inner boss.

[0097] Embodiment 4 of the well washing oil casing separate injection pipe column in the application: different from embodiment 1, the inner hole of the upper sleeve is an equal-diameter cylindrical hole, at this time, an inner boss cooperating with the partition part can be arranged on the inner wall of the lower sleeve.

[0098] Embodiment 5 of the well washing oil casing separate injection pipe column in the application: different from embodiment 1, the sleeve is not formed by connecting the upper sleeve and the lower sleeve in two parts, but is integrally processed and formed.

[0099] Embodiment 6 of the well washing oil casing separate injection pipe column in the application: different from embodiment 1, the upper central pipe is not a stepped pipe, but an equal-diameter pipe, the well washing central pipe is directly screwed with the lower end of the upper central pipe, and the upper part of the washing piston is clamped between the lower end of the upper central pipe and the inner sleeve.

[0100] Embodiment 7 of the well washing oil casing separate injection pipe column in the application: different from embodiment 1, the lower end surface of the diameter expansion section is a plane, and the upper end surface of the outer central pipe is also a plane.

[0101] Embodiment 8 of the well washing oil casing separate injection pipe column in the application: different from embodiment 1, the well washing central pipe does not include a diameter expansion section, but an annular boss is arranged on the lower end outer circumferential surface of the well washing central pipe, at this time, the lower central pipe of the packer is directly screwed with the inner side wall of the lower end of the well washing central pipe, the lower end of the elastic member is in top pressing contact with the upper end surface of the annular boss, and the lower end of the inner sleeve is screwed with the outer side wall of the annular boss.

[0102] Embodiment 9 of the well washing oil casing separate injection pipe column in the application: different from embodiment 1, the inner central pipe is not formed by connecting the upper central pipe and the well washing central pipe in two parts, but is integrally processed and formed.

[0103] Embodiment 10 of the well washing oil casing separate injection pipe column in the application: different from embodiment 1, the elastic member is a rubber sleeve or a metal elastic sheet.

[0104] Embodiment of the well washing and sealing integrated tool in the application: the specific structure of the well washing and sealing integrated tool is the same as that of the well washing and sealing integrated tool in the above-mentioned well washing oil casing separate injection pipe column embodiments, and will not be repeated here.

[0105] The above is only the preferred embodiment of the application, and is not used to limit the application, the patent protection scope of the application is subject to the claims, any equivalent structural changes made by applying the content of the specification and drawings of the application should also be included in the protection scope of the application.

Claims

1. A wellbore cleanout and packoff integrated tool characterized by, The positive well flushing device (2-2) comprises: The inner central pipe is fixedly connected with the upper joint (2-1) at the upper end; The outer sleeve is fixedly connected with the upper joint (2-1) at the upper end, and the outer sleeve is located outside the inner central pipe, and a first annular space is formed between the upper part of the outer sleeve and the inner central pipe; the outer sleeve is provided with a liquid discharge hole (2-211) for communicating the first annular space and the oil jacket annular space; The inner sleeve (2-26) is fixedly connected with the inner central pipe at the lower end, a second annular space is formed between the inner sleeve (2-26) and the outer sleeve, a third annular space is formed between the inner sleeve (2-26) and the inner central pipe, the inner central pipe is provided with a liquid inlet hole (2-271) and a liquid outlet hole (2-273) communicating with the third annular space, the liquid inlet hole (2-271) is located above the liquid outlet hole (2-273), and a ball seat (2-272) is arranged on the inner wall of the inner central pipe between the liquid inlet hole (2-271) and the liquid outlet hole (2-273); The positive flushing piston (2-24) is arranged between the inner central pipe and the inner sleeve (2-26), the outer side wall of the positive flushing piston (2-24) is in sliding contact with the inner side wall of the inner sleeve (2-26), the upper end of the positive flushing piston (2-24) has a partition part for partitioning the first annular space and the second annular space, the lower end of the positive flushing piston (2-24) is provided with a protruding part protruding inward, and the protruding part is in sliding contact with the outer side wall of the inner central pipe; The elastic member is arranged below the positive flushing piston (2-24) to make the positive flushing piston (2-24) have an upper position and a lower position, when the positive flushing piston (2-24) is in the upper position, the partition part partitions the first annular space and the second annular space, the protruding part is located at a position corresponding to the ball seat (2-272), and the third annular space is partitioned; when the positive flushing piston (2-24) is in the lower position, the first annular space and the second annular space are communicated, the protruding part is located at a position corresponding to the liquid outlet hole (2-273), and the liquid inlet hole (2-271) and the liquid outlet hole (2-273) are communicated through the third annular space; The lower central pipe (2-33) is fixedly connected with the lower end of the inner central pipe at the upper end; The outer central pipe (2-32) is fixedly connected with the lower end of the outer sleeve at the upper end, the rubber sleeve (2-31) is mounted on the outer part of the outer central pipe (2-32), the outer central pipe (2-32) is located outside the lower central pipe (2-33) and forms a fourth annular space with the lower central pipe (2-33), the upper end of the fourth annular space communicates with the second annular space, and the lower end is used for communicating with the oil jacket annular space below the rubber sleeve (2-31). ​ ​ 2. The well wash and pack integrated tool of claim 1, wherein, The inner central tube comprises an upper central tube (2-22) and a washing well central tube (2-27) threadedly connected below the upper central tube (2-22), the first annular space is formed by the interval between the upper part of the outer sleeve and the upper central tube (2-22), the third annular space is formed by the interval between the washing well central tube (2-27) and the inner sleeve (2-26), and the liquid inlet hole (2-271), the liquid outlet hole (2-273) and the ball seat (2-272) are all arranged on the washing well central tube (2-27).

3. The clean-out and packoff integrated tool of claim 2, wherein, The washing well central tube (2-27) is in a stepped shape, the lower end of the washing well central tube (2-27) is provided with a diameter expansion section (2-274) which expands outward, the upper end surface of the diameter expansion section (2-274) is in top pressure contact with the lower end of the elastic member, the lower end of the inner sleeve (2-26) is threadedly connected with the outer side wall of the diameter expansion section (2-274), and the lower central tube (2-33) of the packer (2-3) is threadedly connected with the inner side wall of the diameter expansion section (2-274).

4. The clean-out and packoff integrated tool of claim 3, wherein, The lower end surface of the diameter expansion section (2-274) is a lower taper surface, the upper end surface of the outer central tube (2-32) is an upper taper surface which matches the inclination of the lower taper surface, and the upper taper surface and the lower taper surface form an inclined channel which communicates the second annular space and the fourth annular space.

5. The well wash and pack integrated tool of any of claims 2-4, wherein, The upper central tube (2-22) is in a stepped shape and comprises a small-diameter section in the upper part and a large-diameter section in the lower part, the washing well central tube (2-27) is threadedly connected with the inner side wall of the large-diameter section, and the upper part of the positive washing piston (2-24) is clamped between the outer side wall of the large-diameter section and the inner sleeve (2-26).

6. The well-flushing and packoff integrated tool of any one of claims 1-4, wherein, The outer sleeve comprises an upper outer sleeve (2-21) and a lower outer sleeve (2-25) threadedly connected with the upper outer sleeve (2-21), the liquid discharge hole (2-211) is arranged on the upper outer sleeve (2-21), the second annular space is formed by the interval between the lower outer sleeve (2-25) and the inner sleeve (2-26), and the outer central tube (2-32) is threadedly connected with the lower outer sleeve (2-25).

7. The clean-out and packoff integrated tool of claim 6, wherein, The inner hole of the upper outer sleeve (2-21) is in a funnel shape which is large in the upper part and small in the lower part.

8. The clean-out and packoff integrated tool of claim 6, wherein, The inner wall of the upper outer sleeve (2-21) is provided with an inner boss, when the positive washing piston (2-24) is in the upper position, the upper end surface of the partition part is in abutting contact with the lower end surface of the inner boss and a sealing ring is arranged between the two.

9. The well-flushing and packoff integrated tool of any one of claims 1-4, wherein, The hole diameter of the liquid outlet hole (2-273) is larger than the hole diameter of the liquid inlet hole (2-271).

10. A washable wellbore casing and tubing separate injection string, characterized by, The washing well and packer integrated tool comprises a tubing (1) and a washing well and packer integrated tool connected with the tubing (1), and the washing well and packer integrated tool is the same as the washing well and packer integrated tool in any one of claims 1-9.

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