Self-spraying rotary pumping operation tubular column and construction method

Abstract

The invention provides a self-spraying rotary pumping operation tubular column and a construction method. The operation tubular column comprises a packer assembly, and the packer assembly is set in an annulus in the radial direction under the action of pressure in a pipe; the feeding tool is arranged on an oil pipe or a drilling tool and connected with the packer assembly, and after the packer assembly is fed into an underground set position, the packer assembly is driven to be set, and then the feeding tool is separated from the packer assembly; the lower end of the oil pipe is connected with the packer assembly through a positioning sealing piece, so that reservoir transformation operation and self-spraying production are achieved; a jet pump is arranged on the inner pipe; wherein when the pressure of the ground layer is not enough to support the self-spraying production, the inner pipe is connected into the oil pipe, so that the production of the pumping operation is carried out.

Description

Technical Field

[0001] The invention relates to a self-flowing rotary pumping operation pipe string, in particular to a self-flowing rotary pumping and later well repairing non-snubbing operation pipe string, belonging to the technical field of underground construction operations; in addition, the invention also relates to a construction method. Background Art

[0002] At present, the self-flowing pipe string is a common production pipe string in the early development of oil and gas wells in the petroleum industry, which meets the production needs in the early stage of oil and gas well development. However, with the continuous development and the change of formation energy, it is necessary to use mechanical oil production methods such as pumping and machine production in the later stage to realize the continuous exploitation of oil and gas resources in the wellbore. The use of mechanical oil production also faces different frequencies of well repair operations in the later stage. When changing the pipe string used in different oil production methods and performing well repair operations in the later stage, it is necessary to fully consider well control safety and perform well pressure operations.

[0003] In response to the current demand for the transformation of oil production methods, existing technologies, such as self-flowing machine-recovery integrated pipe strings, cannot meet the requirements of later conversion without well suppression and safe operation during well repair operations. Some technologies can only meet the requirements of well completion without well suppression under self-flowing conditions, but cannot meet the requirements of later well repair and machine-recovery operations. For well suppression operations, a large amount of liquid in the wellbore will be squeezed into the formation, causing a certain degree of damage to the supporting fractures and reservoirs, and at the same time affecting the formation pressure, causing a safety risk of uncontrolled well pressure. Summary of the invention

[0004] In view of the above-mentioned technical problems existing in the prior art, the present invention proposes an operating pipe string and construction method for converting self-flowing production to mechanical pumping production, which is suitable for the safe conversion of early self-flowing production of oil wells and subsequent mechanical pumping production, while meeting the safety construction requirements of later well repair operations, and providing a safe, efficient and reliable method and pipe string technology for oil and gas development.

[0005] The present invention provides a self-flowing to machine-pumping operation string, comprising: A packer assembly, wherein the packer assembly is radially set in the annulus under the pressure in the pipe; A running tool, which is arranged on the oil pipe or the drilling tool and connected to the packer assembly, drives the packer assembly to set the packer assembly after the packer assembly is run into a set position downhole, and then separates from the packer assembly; An oil pipe, the lower end of which is connected to the packer assembly via a positioning seal, thereby achieving reservoir reconstruction operations and self-flowing production; and An inner tube, wherein a jet pump is provided on the inner tube; When the formation pressure is reduced and is insufficient to support self-flowing production, the inner pipe is connected to the oil pipe to carry out pumping production.

[0006] A further improvement of the present invention is that the packer assembly comprises a completion packer, and a tie-back tube is provided at the upper end of the completion packer, and the tie-back tube is used to connect the running tool or the positioning seal; The running tool or the positioning seal is connected to the tie-back cylinder through threads, and can be separated from the tie-back cylinder through forward rotation to achieve release.

[0007] A further improvement of the present invention is that a sealing nipple is provided at the lower end of the completion packer, a hydraulic sleeve is provided at the lower end of the sealing nipple, and a landing nipple is provided at the lower end of the hydraulic sleeve.

[0008] A further improvement of the present invention is that the hydraulic sleeve can be opened or closed by the pressure in the annulus, and a plug is provided on the seating nipple, and the plug can seal the seating nipple or separate on the seating nipple.

[0009] A further improvement of the present invention is that a sleeve hydraulic pipeline is provided on the packer assembly, the upper end of the sleeve hydraulic pipeline is located above the completion packer, and the lower end of the sleeve hydraulic pipeline is connected to the hydraulic sleeve; The upper end of the sleeve hydraulic pipeline is subjected to annular pressure, thereby driving the hydraulic sleeve to open or close.

[0010] A further improvement of the present invention is that the running tool includes an upper anchor seal, the lower end of the anchor seal is provided with a pipe extending to the completion packer, the lower end of the pipe is provided with a lower positioning sealing device, and the interior of the lower end of the pipe is provided with a ball seat.

[0011] A further improvement of the present invention is that a thread connected to the tie-back tube is provided on the outer side of the anchor seal, and the lower positioning seal device is sealingly connected to the sealing nipple; The pipe is provided with a pressure transmission hole or a flow channel capable of transmitting the pressure in the pipe to the completion packer; After the ball is dropped into the ball seat and seals the lowering of the pipe, the pressure in the pipe drives the completion packer to be set.

[0012] A further improvement of the present invention is that an inner tube positioning sealing device is provided at the lower end of the inner tube, and the inner tube positioning sealing device is provided with an external thread, an internal thread is provided inside the positioning sealing component, and the inner tube positioning sealing device is connected to the positioning sealing component through threads.

[0013] According to another aspect of the present invention, a construction method is also proposed, which uses the self-spraying and machine-pumping working pipe string to carry out construction operations.

[0014] A further improvement of the present invention is that the method comprises: The packer assembly is connected to the oil pipe or drilling tool through a running tool to form a running pipe string, and the packer is sent into the well through the running pipe string; The pressure ball is put into the ball seat, and the pressure is held in the pipe to seal and hang the packer. Then the annulus is pressurized to test the packer. After the forward rotation, the pipe string is taken out. The running oil pipe is connected to the packer assembly through the positioning seal to form a completion string; The hydraulic sleeve is opened by controlling the sleeve hydraulic pipeline by pressurizing the annulus, and then the reservoir transformation operation is carried out; after the reservoir transformation operation, the self-flowing production operation is carried out.

[0015] A further improvement of the present invention is that when the formation pressure is reduced and is insufficient to support the self-flowing production, the hydraulic sleeve is closed by controlling the sleeve hydraulic pipeline to prevent the pressure in the formation from rising; Then, lower the inner pipe, open the hydraulic sleeve through the hydraulic pipeline, and start the jet pump to carry out pumping production operations.

[0016] A further improvement of the present invention is that when well repair operations are required, the hydraulic sleeve is closed by controlling the sleeve hydraulic pipeline by changing the annulus pressure, at which time the formation pressure inside the pipe can be blocked, and then the inner pipe and the oil pipe are taken out in turn to carry out well repair operations.

[0017] A further improvement of the present invention is that if the hydraulic sleeve cannot be opened normally, the jet pump is taken out by wire operation, and then the plug located on the short section is taken out, and the jet pump is re-inserted to carry out pumping production operations.

[0018] Compared with the prior art, the advantages of the present invention are: The operating tubing string and construction method for converting self-flowing to mechanical pumping according to the present invention are suitable for the safe conversion of early self-flowing production of oil wells and subsequent mechanical pumping production, while meeting the safety construction requirements of later well repair operations, and providing a safe, efficient and reliable method and tubing string technology for oil and gas development.

[0019] According to the self-flowing and machine-pumping operating string and construction method described in the present invention, the risk of production layer pollution caused by well-killing operations can be reduced by not killing the well, providing a safe and effective operating string and construction method for oil and gas development, ensuring the smooth progress of oil and gas production operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which: Figure 1It is a schematic diagram of the structure of a self-flowing to machine pumping operation string according to an embodiment of the present invention, showing the state of the string being sent into the completion operation; Figure 2 It is a schematic structural diagram of a self-flowing and pumping operation string according to an embodiment of the present invention, showing the setting state of the packer of the sent-in string; Figure 3 It is a schematic diagram of the structure of a self-flowing to mechanical pumping operation string according to an embodiment of the present invention, showing the state of the lower completion string being left in the well; Figure 4 It is a schematic diagram of the structure of a self-flowing to machine-pumping operation string according to an embodiment of the present invention, showing the structure of the self-flowing production string; Figure 5 It is a schematic diagram of the structure of a self-flowing machine-pumped working string according to an embodiment of the present invention, showing the state of the pumping string being lowered; Figure 6 It is a schematic structural diagram of a self-flowing to machine-pumping operation string according to an embodiment of the present invention, showing the production status of the pumping string; Figure 7 It is a schematic diagram of the structure of a working pipe string of a self-flowing rotary machine extraction according to an embodiment of the present invention, showing the state of the sliding sleeve opening and the abnormal pipe string extraction; Figure 8 It is a schematic structural diagram of a self-flowing and machine-pumping working string according to an embodiment of the present invention, showing the abnormal pumping state with the sleeve opened.

[0021] The drawings are not drawn to scale.

[0022] The meanings of the reference numerals in the accompanying drawings are as follows: 11. Oil pipe or drilling tool, 12. Anchor seal, 13. Lower positioning seal, 14. Ball seat, 21. Tieback tube, 22. Sliding sleeve hydraulic pipeline, 23. Completion packer, 24. Sealing short joint, 25. Hydraulic sliding sleeve, 26. Plug, 27. Landing short joint, 31. Oil pipe, 32. Positioning seal, 41. inner tube; 42. jet pump; 43. inner tube positioning sealing device. DETAILED DESCRIPTION

[0023] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0024] At present, the self-flowing pipe string is a common production pipe string in the early development of oil and gas wells in the petroleum industry, which meets the production needs in the early stage of oil and gas well development. However, with the continuous development and the change of formation energy, it is necessary to use mechanical oil production methods such as pumping and machine production in the later stage to realize the continuous exploitation of oil and gas resources in the wellbore. The use of mechanical oil production also faces different frequencies of well repair operations in the later stage. When changing the pipe string used in different oil production methods and performing well repair operations in the later stage, it is necessary to fully consider well control safety and perform well pressure operations.

[0025] In response to the current demand for the transformation of oil production methods, existing technologies, such as self-flowing machine-recovery integrated pipe strings, cannot meet the requirements of later conversion without well suppression and safe operation during well repair operations. Some technologies can only meet the requirements of well completion without well suppression under self-flowing conditions, but cannot meet the requirements of later well repair and machine-recovery operations. For well suppression operations, a large amount of liquid in the wellbore will be squeezed into the formation, causing a certain degree of damage to the supporting fractures and reservoirs, and at the same time affecting the formation pressure, causing a safety risk of uncontrolled well pressure.

[0026] To solve the above problems, the present invention proposes an operating tubing string and construction method for converting self-flowing to mechanical pumping, which is suitable for the safe conversion of early self-flowing production and subsequent mechanical pumping production of oil wells, while meeting the safety construction requirements of later well repair operations, and providing a safe, efficient and reliable method and tubing string technology for oil and gas development.

[0027] In such Figure 1 In the embodiment shown, a self-flowing to machine-pumping operation string comprises: A packer assembly, wherein the packer assembly is radially set in the annulus under the pressure in the pipe; A running tool, which is arranged on the oil pipe or the drilling tool 1 and connected to the packer assembly, drives the packer assembly to set after the packer assembly is run into a set position downhole, and then separates from the packer assembly; An oil pipe 31, the lower end of which is connected to the packer assembly via a positioning seal 32, thereby achieving reservoir reconstruction operations and self-flowing production; and The inner tube 41 is provided with a jet pump 42. When the formation pressure is reduced and is not sufficient to support the self-flowing production, the inner tube 41 is connected to the oil pipe to perform the pumping operation.

[0028] In the self-flowing rotary pumping working string according to the present embodiment, the running tool can be connected to the oil pipe or the drilling tool 1, and can be plugged into the upper end of the packer assembly. The packer is sent into the well through the oil pipe or the drilling tool 1, and the sealing is achieved by pressurizing the inside of the pipe. After that, the running tool can be released by forward rotation.

[0029] The oil pipe can be connected to the packer assembly through the positioning seal 32, and reservoir reconstruction operations and self-flowing production can be performed. When the formation pressure is reduced and is not enough to support self-flowing production, the inner pipe 41 is connected to the oil pipe to perform pumping operations.

[0030] In one embodiment, the packer assembly includes a completion packer 23, and a tie-back tube 21 is provided at the upper end of the completion packer 23. The tie-back tube 21 can be plugged with the running tool or the positioning seal 32 and connected by threads; The running tool or the positioning seal 32 can be separated from the tie-back cylinder 21 by forward rotation to achieve release.

[0031] In the self-jetting machine-drawn working pipe string described in this embodiment, the tie-back tube 21 is provided with an internal thread, the running tool and the positioning seal 32 are provided with external threads, and the positioning seal 32 has a certain elasticity. During the process of plugging with the tie-back tube 21, it can be elastically contracted and connected to the tie-back tube 21, and after the connection, it can open and remain connected to the tie-back tube 21.

[0032] When separation is required, the threads of the positioning seal 32 and the tie-back tube 21 are disengaged by rotating the positioning seal 32 forward, thereby separating the positioning seal 32 from the tie-back tube 21 .

[0033] In one embodiment, a sealing sub 24 is disposed at the lower end of the completion packer 23 , a hydraulic sleeve 25 is disposed at the lower end of the sealing sub 24 , and a landing sub 27 is disposed at the lower end of the hydraulic sleeve 25 .

[0034] The hydraulic sleeve 25 can be opened or closed by the pressure in the annulus, and a plug 26 is provided on the seating nipple 27 , and the plug 26 can seal the seating nipple 27 or be separated on the seating nipple 27 .

[0035] During production operations, the hydraulic sleeve 25 is opened by the pressure in the annulus, and the oil in the well enters the pipe through the hydraulic sleeve 25 and enters the oil pipe above under the action of formation pressure, thereby realizing self-flowing production operations.

[0036] When the formation pressure is reduced and is insufficient to support the self-flowing production, the inner tube 41 is connected to the oil pipe to perform the production by pumping operation.

[0037] In one embodiment, a sleeve hydraulic pipeline 22 is provided on the packer assembly, the upper end of the sleeve hydraulic pipeline 22 is located above the completion packer 23, and the lower end of the sleeve hydraulic pipeline 22 is connected to the hydraulic sleeve 25; The upper end of the sleeve hydraulic pipeline 22 is subjected to the annulus pressure above the completion packer 23, and the sleeve hydraulic pipeline 22 transmits the annulus pressure to the hydraulic sleeve 25, and controls the opening or closing of the hydraulic sleeve 25; or, the sleeve hydraulic pipeline 22 can move axially when subjected to the annulus pressure, thereby driving the hydraulic sleeve 25 to open or close.

[0038] In this way, the opening or closing of the hydraulic sleeve 25 can be controlled by pressurizing or releasing pressure to the annulus at the wellhead.

[0039] In one embodiment, the running tool includes an upper anchor seal 12, the lower end of which is provided with a tubular extending to the completion packer 23, the lower end of which is provided with a lower positioning sealing device 13, and the interior of the lower end of the tubular is provided with a ball seat 14.

[0040] The upper end of the anchor seal 12 is connected to the oil pipe or the drilling tool 1 , and a thread matching with the tie-back tube 21 is arranged on the outer side; the lower positioning seal device 13 is sealedly connected to the sealing nipple 24 .

[0041] A flow channel or pressure transmission hole connecting the inside and the outside is provided on the pipe between the lower positioning seal device 13 and the positioning seal 32, which can transmit the pressure in the pipe to the completion packer 23, thereby driving the completion packer 23 to expand and seal.

[0042] After the running tool assembles the packer assembly, the lower positioning seal device 13 is connected to the sealing nipple 24, and the positioning seal 32 is connected to the tie-back tube 21, and then the packer assembly is lowered to a predetermined position underground through the oil pipe or drilling tool 1. A ball is dropped into the pipe, and after the ball falls into the ball seat 14, the pressure in the pipe is blocked.

[0043] At this time, the inside of the oil pipe or drilling tool 1 is pressurized, and the pressure is transmitted to the pipe fitting of the delivery tool. Since the lower end of the pipe fitting is sealed by the lower positioning sealing device 13 and the ball seat 14, the internal pressure is transmitted to the completion packer 23. The completion packer 23 expands under the action of pressure and is sealed on the well wall.

[0044] After that, the pressurization into the pipe is stopped, and the anchor seal 12 is separated from the tie-back tube 21 by rotating the tubing or the drilling tool 1 forward, so that the running tool and the packer assembly are separated and the release is achieved.

[0045] In one embodiment, an inner tube positioning sealing device 43 is provided at the lower end of the inner tube 41, and the inner tube positioning sealing device 43 is provided with an external thread, and the interior of the positioning seal 32 is provided with an internal thread, and the inner tube positioning sealing device 43 is connected to the positioning seal 32 through threads.

[0046] According to another aspect of the present invention, a construction method is also proposed, which uses the self-jetting and machine-pumping working pipe string described in the above embodiment to perform construction operations.

[0047] In one embodiment, the construction method comprises the following steps: The packer assembly is connected to the oil pipe or the drilling tool 1 by a running tool to form a running pipe string, and the packer is sent into the well by the running pipe string; The pressure ball is dropped into the ball seat 14, and the pressure is held in the pipe to seal and hang the well packer 23, and then the annulus is pressurized to perform the packer sealing operation; after the forward rotation is released, the delivery pipe string is taken out; The running oil pipe is connected to the packer assembly through the positioning seal 32 to form a completion string; The hydraulic sleeve 25 is opened by controlling the sleeve hydraulic pipeline 22 by pressurizing the annulus, and then the reservoir transformation operation is carried out; after the reservoir transformation operation, the self-flowing production operation is carried out.

[0048] In a preferred embodiment, when the formation pressure is reduced to be insufficient to support the self-flowing production, the hydraulic sleeve 25 is closed by controlling the sleeve hydraulic pipeline 22 to prevent the pressure in the formation from rising; Then, the inner pipe 41 is lowered, the hydraulic sleeve 25 is opened through the hydraulic pipeline, and the jet pump 42 is started to perform pumping production operations.

[0049] In a preferred embodiment, when well repair operations are required, the hydraulic sleeve 25 is closed by controlling the sleeve hydraulic pipeline 22 by changing the annulus pressure, thereby sealing the formation pressure inside the pipe. Then, the inner pipe 41 and the oil pipe are taken out in turn to perform well repair operations.

[0050] In a preferred embodiment, if the hydraulic sleeve 25 cannot be opened normally, the jet pump 42 is removed by wire operation, and then the plug 26 located on the short section 27 is removed, and the jet pump 42 is re-inserted to perform pumping production operations.

[0051] In a specific embodiment, the method comprises: The packer assembly is connected to the oil pipe or drilling tool 1 through a delivery tool to form a delivery pipe string, and the packer is delivered into the well through the delivery pipe string. Figure 1 shown.

[0052] The pipe string assembly is lowered to the designed position, and the pressure-holding ball is thrown from the wellhead and falls into the ball seat 14. The packer 23 is set and hung after the packer is set. Figure 2As shown, the annulus is pressurized to test the seal of the packer. After the seal is tested, the hydraulic sleeve 25 is closed by increasing and releasing the pressure three times through the sleeve hydraulic pipeline 22. At this time, the well control risk caused by the formation pressure inside and outside the pipe can be effectively avoided, and the pipe string can be safely removed after the forward release. Figure 3 The lower completion string is shown in the wellbore.

[0053] The upper completion string with the sealing tube and the positioning seal 32 is inserted into the thread of the tie-back tube 21 to achieve positive insertion, locking and sealing. At this time, the hydraulic sleeve 25 is opened by controlling the sleeve hydraulic pipeline 22, and the reservoir transformation operation can be achieved after opening. After the reservoir transformation operation, self-flowing production can be achieved under the action of the formation pressure, and oil and gas can enter the wellbore through the circulation hole in the hydraulic sleeve 25 to achieve production.

[0054] When the formation pressure is reduced to be insufficient to support the self-flowing production, the hydraulic sleeve 25 can be closed by controlling the sleeve hydraulic pipeline 22. At this time, the pressure in the formation can be effectively prevented from rising, and the well control risk can be avoided. The inner pipe 41 and the inner pipe positioning sealing device 43 can be safely lowered, and the jet pump 42 can be lowered. Figure 5 At this time, the sliding sleeve can be opened through the hydraulic pipeline, and the pumping operation can be carried out after the sliding sleeve is opened, such as Figure 6 shown.

[0055] When well repair is needed, the annulus is pressurized and the hydraulic sleeve 25 is closed. At this time, the pressure from the formation to the inner pipe can be blocked. The inner pipe 41, the jet pump 42, the inner pipe positioning seal device 43, the oil pipe and the positioning seal 32 can be taken out in sequence and then the well repair can be carried out. Figure 4~Figure 6 Repeated insertion and production of self-nozzle pipe columns.

[0056] If the hydraulic sleeve 25 cannot be opened, the jet pump 42 can be removed by wire operation, and then the plug 26 located on the short section 27 can be removed. Figure 7 After the jet pump 42 is re-installed, the pumping production operation is resumed.

[0057] Example 1 A self-flowing to machine-pumping operation string, comprising: A packer assembly, wherein the packer assembly is radially set in the annulus under the pressure in the pipe; A running tool, which is arranged on the oil pipe or the drilling tool 1 and connected to the packer assembly, drives the packer assembly to set after the packer assembly is run into a set position downhole, and then separates from the packer assembly; An oil pipe, the lower end of which is connected to the packer assembly via a positioning seal 32, thereby achieving reservoir reconstruction operations and self-flowing production; and The inner tube 41 is provided with a jet pump 42. When the formation pressure is reduced and is not sufficient to support the self-flowing production, the inner tube 41 is connected to the oil pipe to perform the pumping operation.

[0058] The running tool can be connected to the oil pipe or drilling tool 1 and can be plugged into the upper end of the packer assembly. The packer is sent into the well through the oil pipe or drilling tool 1, and the packer is set by pressurizing the inside of the pipe. After that, the running tool can be released by forward rotation.

[0059] The oil pipe can be connected to the packer assembly through the positioning seal 32, and reservoir reconstruction operations and self-flowing production can be performed. When the formation pressure is reduced and is not enough to support self-flowing production, the inner pipe 41 is connected to the oil pipe to perform pumping operations.

[0060] The packer assembly includes a completion packer 23, and a tie-back tube 21 is provided at the upper end of the completion packer 23. The tie-back tube 21 can be plugged with the running tool or the positioning seal 32 and connected by threads; The running tool or the positioning seal 32 can be separated from the tie-back cylinder 21 by forward rotation to achieve release.

[0061] The tie-back tube 21 is provided with an internal thread, the delivery tool and the positioning seal 32 are provided with an external thread, and the positioning seal 32 has a certain elasticity. During the process of plugging with the tie-back tube 21, it can be elastically contracted and connected to the tie-back tube 21, and after being connected, it can open and remain connected to the tie-back tube 21.

[0062] When separation is required, the threads of the positioning seal 32 and the tie-back tube 21 are disengaged by rotating the positioning seal 32 forward, thereby separating the positioning seal 32 from the tie-back tube 21 .

[0063] A sealing sub 24 is disposed at the lower end of the completion packer 23 , a hydraulic sleeve 25 is disposed at the lower end of the sealing sub 24 , and a seating sub 27 is disposed at the lower end of the hydraulic sleeve 25 .

[0064] The hydraulic sleeve 25 can be opened or closed by the pressure in the annulus, and a plug 26 is provided on the seating nipple 27 , and the plug 26 can seal the seating nipple 27 or be separated on the seating nipple 27 .

[0065] During production operations, the hydraulic sleeve 25 is opened by the pressure in the annulus, and the oil in the well enters the pipe through the hydraulic sleeve 25 and enters the oil pipe above under the action of formation pressure, thereby realizing self-flowing production operations.

[0066] When the formation pressure is reduced and is insufficient to support the self-flowing production, the inner tube 41 is connected to the oil pipe to perform the production by pumping operation.

[0067] The packer assembly is provided with a sleeve hydraulic pipeline 22, the upper end of the sleeve hydraulic pipeline 22 is located above the completion packer 23, and the lower end of the sleeve hydraulic pipeline 22 is connected to the hydraulic sleeve 25; The upper end of the sleeve hydraulic pipeline 22 is subjected to the annulus pressure above the completion packer 23, and the sleeve hydraulic pipeline 22 transmits the annulus pressure to the hydraulic sleeve 25, and controls the opening or closing of the hydraulic sleeve 25; or, the sleeve hydraulic pipeline 22 can move axially when subjected to the annulus pressure, thereby driving the hydraulic sleeve 25 to open or close.

[0068] In this way, the opening or closing of the hydraulic sleeve 25 can be controlled by pressurizing or releasing pressure to the annulus at the wellhead.

[0069] The running tool comprises an upper anchor seal 12, the lower end of which is provided with a pipe extending to the completion packer 23, the lower end of which is provided with a lower positioning seal device 13, and the interior of the lower end of which is provided with a ball seat 14.

[0070] The upper end of the anchor seal 12 is connected to the oil pipe or the drilling tool 1 , and a thread matching with the tie-back tube 21 is arranged on the outer side; the lower positioning seal device 13 is sealedly connected to the sealing nipple 24 .

[0071] A flow channel or pressure transmission hole connecting the inside and the outside is provided on the pipe between the lower positioning seal device 13 and the positioning seal 32, which can transmit the pressure in the pipe to the completion packer 23, thereby driving the completion packer 23 to expand and seal.

[0072] After the running tool assembles the packer assembly, the lower positioning seal device 13 is connected to the sealing nipple 24, and the positioning seal 32 is connected to the tie-back tube 21, and then the packer assembly is lowered to a predetermined position underground through the oil pipe or drilling tool 1. A ball is dropped into the pipe, and after the ball falls into the ball seat 14, the pressure in the pipe is blocked.

[0073] At this time, the inside of the oil pipe or drilling tool 1 is pressurized, and the pressure is transmitted to the pipe fitting of the delivery tool. Since the lower end of the pipe fitting is sealed by the lower positioning sealing device 13 and the ball seat 14, the internal pressure is transmitted to the completion packer 23. The completion packer 23 expands under the action of pressure and is sealed on the well wall.

[0074] After that, the pressurization into the pipe is stopped, and the anchor seal 12 is separated from the tie-back tube 21 by rotating the tubing or the drilling tool 1 forward, so that the running tool and the packer assembly are separated and the release is achieved.

[0075] An inner tube positioning sealing device 43 is provided at the lower end of the inner tube 41 , and the inner tube positioning sealing device 43 is provided with an external thread, and an internal thread is provided inside the positioning sealing member 32 , and the inner tube positioning sealing device 43 is connected to the positioning sealing member 32 through threads.

[0076] Example 2 A construction method, using the self-spraying and machine-pumping working pipe string described in Example 1 to carry out construction operations.

[0077] The construction method comprises the following steps: The packer assembly is connected to the oil pipe or the drilling tool 1 by a running tool to form a running pipe string, and the packer is sent into the well by the running pipe string; The pressure ball is dropped into the ball seat 14, and the pressure is held in the pipe to seal and hang the well packer 23, and then the annulus is pressurized to perform the packer sealing operation; after the forward rotation is released, the delivery pipe string is taken out; The running oil pipe is connected to the packer assembly through the positioning seal 32 to form a completion string; The hydraulic sleeve 25 is opened by controlling the sleeve hydraulic pipeline 22 by pressurizing the annulus, and then the reservoir transformation operation is carried out; after the reservoir transformation operation, the self-flowing production operation is carried out.

[0078] When the formation pressure is reduced to a level that is insufficient to support the self-flowing production, the hydraulic sleeve 25 is closed by controlling the sleeve hydraulic pipeline 22 to prevent the pressure in the formation from rising. Then, the inner pipe 41 is lowered, the hydraulic sleeve 25 is opened through the hydraulic pipeline, and the jet pump 42 is started to perform pumping production operations.

[0079] When well repair is needed, the sleeve hydraulic pipeline 22 is controlled to close the hydraulic sleeve 25 by changing the annular pressure, thereby sealing the formation pressure inside the pipe. Then, the inner pipe 41 and the oil pipe are taken out in turn to carry out well repair.

[0080] If the hydraulic sleeve 25 cannot be opened normally, the jet pump 42 is taken out by wire operation, and then the plug 26 located on the short section 27 is taken out, and the jet pump 42 is put back in to carry out pumping production operation.

[0081] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should be extended to equivalent substitutions of these features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0082] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0083] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] Certain terms are used throughout this specification to refer to specific system components. As will be appreciated by those skilled in the art, different names may be used to refer to the same component, and thus this specification is not intended to distinguish between components that differ only in name and not in function. References to "one embodiment" or "an embodiment" in the specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the invention. Therefore, the phrases "one embodiment" or "an embodiment" appearing in various places throughout the specification do not necessarily all refer to the same embodiment.

[0085] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0086] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made according to the embodiments of the present invention should be included within the scope of protection of the present invention.

Claims

1. A self-flowing to machine-pumping operation string, characterized in that: include: A packer assembly, wherein the packer assembly is radially set in the annulus under the pressure in the pipe; A running tool, the running tool being arranged on the oil pipe or the drilling tool (1) and connected to the packer assembly, driving the packer assembly to set the packer assembly after the packer assembly is run into a set position downhole, and then being separated from the packer assembly; An oil pipe (31), the lower end of which is connected to the packer assembly via a positioning seal (32), thereby achieving reservoir reconstruction operations and self-flowing production; and An inner tube (41), wherein a jet pump (42) is provided on the inner tube (41); When the formation pressure decreases and is insufficient to support self-flowing production, the inner pipe (41) is connected to the oil pipe (31) to perform pumping production.

2. The self-flowing to machine-pumping operation pipe string according to claim 1 is characterized in that: The packer assembly comprises a completion packer (23), the upper end of the completion packer (23) is provided with a tie-back tube (21), and the tie-back tube (21) is used to connect the running tool or the positioning seal (32); The running tool or the positioning seal (32) is connected to the tie-back cylinder (21) via a threaded connection, and can be separated from the tie-back cylinder (21) by forward rotation, thereby achieving release.

3. The self-flowing to mechanical pumping operation string according to claim 2 is characterized in that: The lower end of the completion packer (23) is provided with a sealing nipple (24), the lower end of the sealing nipple (24) is provided with a hydraulic sleeve (25), and the lower end of the hydraulic sleeve (25) is provided with a landing nipple (27).

4. The self-flowing to mechanical pumping operation string according to claim 3 is characterized in that: The hydraulic sleeve (25) can be opened or closed by the pressure in the annulus, and a plug (26) is provided on the seating nipple (27), and the plug (26) can seal the seating nipple (27) or separate on the seating nipple (27).

5. The self-flowing to mechanical pumping operation string according to claim 4 is characterized in that: The packer assembly is provided with a sleeve hydraulic pipeline (22), the upper end of the sleeve hydraulic pipeline (22) is located above the completion packer (23), and the lower end of the sleeve hydraulic pipeline (22) is connected to the hydraulic sleeve (25); The upper end of the sleeve hydraulic pipeline (22) is subjected to annular pressure, thereby driving the hydraulic sleeve (25) to open or close.

6. The self-flowing to mechanical pumping operation string according to claim 5 is characterized in that: The running tool comprises an upper anchor seal (12), the lower end of the anchor seal (12) is provided with a pipe extending to the completion packer (23) and lowered, the lower end of the pipe is provided with a lower positioning seal device (13), and the lower end of the pipe is provided with a ball seat (14) inside.

7. The self-flowing to mechanical pumping operation pipe string according to claim 6 is characterized in that: The outer side of the anchor seal (12) is provided with a thread connected to the tie-back tube (21), and the lower positioning seal device (13) is sealingly connected to the sealing nipple (24); The pipe member is provided with a pressure transmission hole or a flow channel capable of transmitting the pressure in the pipe to the completion packer (23); When the ball is dropped into place, it falls into the ball seat (14) and seals the lowering of the pipe, and the pressure in the pipe drives the completion packer (23) to be set.

8. The self-flowing to mechanical pumping operation pipe string according to claim 7 is characterized in that: An inner tube positioning sealing device (43) is provided at the lower end of the inner tube (41), and the inner tube positioning sealing device (43) is provided with an external thread, an inner portion of the positioning sealing member (32) is provided with an internal thread, and the inner tube positioning sealing device (43) is connected to the positioning sealing member (32) via threads.

9. A construction method, characterized in that: The construction work is carried out using the self-flowing and machine-pumping working pipe string according to any one of claims 1 to 8.

10. The construction method according to claim 9, characterized in that: include: Connecting the packer assembly to the oil pipe or drilling tool (1) by means of a running tool to form a running pipe string, and running the packer downhole by means of the running pipe string; The pressure-holding ball is dropped into the ball seat (14), and the pressure is held in the pipe to seal and hang the well completion packer (23), and then the annulus is pressurized to perform the packer sealing operation; after the forward rotation is released, the delivery pipe string is taken out; The lowered oil pipe is connected to the packer assembly via a positioning seal (32) to form a completion string; By pressurizing the annulus to control the sleeve hydraulic pipeline (22), the hydraulic sleeve (25) is opened, and then the reservoir transformation operation is carried out; After the reservoir transformation operation, the self-flowing production operation is carried out.

11. The construction method according to claim 10, characterized in that: When the formation pressure is reduced to a level that is insufficient to support the self-flowing production, the hydraulic sleeve (25) is closed by controlling the sleeve hydraulic pipeline (22) to prevent the pressure in the formation from rising. Then, the inner pipe (41) is lowered, the hydraulic sleeve (25) is opened through the hydraulic pipeline, and the jet pump (42) is started to perform pumping production operations.

12. The construction method according to claim 11, characterized in that: When well repair operations are required, the hydraulic sleeve (25) is closed by controlling the sleeve hydraulic pipeline (22) by changing the annular pressure, thereby sealing off the pressure from the formation to the inner pipe. The inner pipe (41) and the oil pipe (31) are then removed in turn to carry out well repair operations.

13. The construction method according to claim 11, characterized in that: If the hydraulic sleeve (25) cannot be opened normally, the jet pump (42) is removed by wire operation, and then the plug (26) located on the short section (27) is removed, and the jet pump (42) is re-inserted to carry out pumping production operation.

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