A work string and method of construction

Abstract

The application provides a work string and a construction method, the work string comprising a packer assembly, the packer assembly being radially set in an annulus under the action of pressure in a pipe; a running tool, the running tool being arranged on a tubing or a drilling tool and being connected to the packer assembly, the running tool driving the packer assembly to set after the packer assembly is run into a set position downhole, and then the running tool is separated from the packer assembly; a tubing, a lower end of the tubing being connected to the packer assembly through a positioning seal, so that reservoir reconstruction work and self-flowing production are realized; and an inner pipe, the inner pipe being provided with a jet pump; when the formation pressure is not low enough to support self-flowing production, the inner pipe is connected in the tubing, so that pumping work production is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to a work string for self-spraying swabbing, in particular to a work string for self-spraying swabbing and late workover without well killing, and belongs to the technical field of downhole construction work. BACKGROUND

[0002] Currently, as a production string commonly used in the early development of oil and gas wells in the oil industry, the self-spraying string meets the production needs in the early development of oil and gas wells, but as the development continues and the formation energy changes, the oil and gas resources in the wellbore need to be continuously exploited through mechanical oil production methods such as pumping and mechanical mining. With the mechanical oil production method, different frequency workover operations are also faced in the later period. When the string is changed and workover operations are performed in the later period, well control safety needs to be fully considered for killing operations.

[0003] Currently, in view of the change in the oil production method, the existing technology, such as the self-spraying and mechanical mining integrated string, cannot meet the safety operation requirements in the later period without well killing and workover operations. Some technologies only meet the self-spraying condition without well killing completion production, and cannot meet the workover and mechanical mining operation methods in the later period. For well killing operations, a large amount of liquid in the wellbore will be squeezed into the formation, which will cause a certain degree of damage to the propped fracture and reservoir, and will also affect the formation pressure, causing the safety risk of uncontrolled well pressure. SUMMARY

[0004] In view of the above technical problems in the prior art, the present application provides a work string for self-spraying swabbing and a construction method, which is suitable for safe conversion of early self-spraying production and subsequent mechanical swabbing production, and meets the safety construction requirements of late workover operations, thereby providing a safe, efficient and reliable method and string technology for oil and gas development.

[0005] The present application provides a work string for self-spraying swabbing, which comprises:

[0006] A packer assembly which is radially set in the annulus under the action of pressure in the pipe;

[0007] A running tool which is arranged on the tubing or drilling tool and connected to the packer assembly, drives the packer assembly to set after the packer assembly is sent to the set position in the downhole, and then separates from the packer assembly;

[0008] A tubing whose lower end is connected to the packer assembly through a positioning sealing element, so as to realize reservoir reconstruction operation and self-spraying production; and

[0009] An inner pipe which is provided with a jet pump;

[0010] When the formation pressure is not low enough to support natural flow production, the inner pipe is connected in the oil pipe to carry out pumping production.

[0011] The further improvement of the present application is that the packer assembly comprises a completion packer, the upper end of the completion packer is provided with a back-off sleeve, the back-off sleeve is used to connect the running tool or the positioning seal;

[0012] The running tool or the positioning seal is connected to the back-off sleeve through threads, and can be separated from the back-off sleeve by positive rotation to realize the release.

[0013] The further improvement of the present application is that the lower end of the completion packer is provided with a sealing nipple, the lower end of the sealing nipple is provided with a hydraulic sliding sleeve, the lower end of the hydraulic sliding sleeve is provided with a landing nipple.

[0014] The further improvement of the present application is that the hydraulic sliding sleeve can be opened or closed by the pressure in the annulus, the landing nipple is provided with a plug, the plug can block the landing nipple or be separated from the landing nipple.

[0015] The further improvement of the present application is that the packer assembly is provided with a sliding sleeve hydraulic line, the upper end of the sliding sleeve hydraulic line is located above the completion packer, the lower end of the sliding sleeve hydraulic line is connected to the hydraulic sliding sleeve.

[0016] The upper end of the sliding sleeve hydraulic line is subjected to the annulus pressure to drive the hydraulic sliding sleeve to open or close.

[0017] The further improvement of the present application is that the running tool comprises an upper anchoring seal, the lower end of the anchoring seal is provided with a pipe member extended to the lower end of the completion packer, the lower end of the pipe member is provided with a lower positioning sealing device, the inside of the lower end of the pipe member is provided with a ball seat.

[0018] The further improvement of the present application is that the outer side of the anchoring seal is provided with threads connected to the back-off sleeve, the lower positioning sealing device is sealingly connected to the sealing nipple.

[0019] The pipe member is provided with a pressure transmission hole or flow channel capable of transmitting the pressure in the pipe to the completion packer;

[0020] When the ball is put in, the ball falls into the ball seat and seals the lower end of the pipe member, and the pressure in the pipe drives the completion packer to set.

[0021] Further improvement of the present application is that the lower end of the inner tube is provided with an inner tube positioning sealing device, and the inner tube positioning sealing device is provided with external threads, the inner part of the positioning sealing device is provided with internal threads, and the inner tube positioning sealing device is connected with the positioning sealing device through threads.

[0022] According to another aspect of the present application, a construction method is also provided, which uses the self-flowing swivel pumping operation string to perform construction operation.

[0023] Further improvement of the present application is that the method comprises:

[0024] The packer assembly is connected on the tubing or drilling tool through the running-in tool to form a running-in pipe string, and the packer is sent downhole through the running-in pipe string;

[0025] The pressure ball is put into the ball seat, the tubing pressure is built up, the well completion packer is set and hanged, then the annulus is pressed to perform the packer sealing test operation, and the running-in pipe string is taken out after the positive rotation and releasing;

[0026] The tubing is lowered to connect the packer assembly through the positioning sealing device to form a well completion pipe string;

[0027] The hydraulic sliding sleeve is opened by controlling the sliding sleeve hydraulic pipeline through the annulus pressure, and then the reservoir reconstruction operation is performed; and the self-flowing production operation is performed after the reservoir reconstruction operation.

[0028] Further improvement of the present application is that when the formation pressure is insufficient to support the self-flowing production, the hydraulic sliding sleeve is closed by controlling the sliding sleeve hydraulic pipeline to prevent the pressure in the formation from rising;

[0029] Then the inner tube is lowered, the hydraulic sliding sleeve is opened through the hydraulic pipeline, and the jet pump is started to perform the pumping production operation.

[0030] Further improvement of the present application is that when the workover operation is needed, the sliding sleeve hydraulic pipeline is controlled to close the hydraulic sliding sleeve by changing the annulus pressure, at this time, the formation can be blocked to the tubing pressure, and then the inner tube and the tubing are taken out in sequence to perform the workover operation.

[0031] Further improvement of the present application is that if the hydraulic sliding sleeve cannot be normally opened, the jet pump is taken out by using the wireline operation, then the plug on the setting nipple is taken out, and the jet pump is lowered again to perform the pumping production operation.

[0032] Compared with the prior art, the present application has the following advantages:

[0033] The operation string and construction method for self-flowing to machine pumping conversion provided by the application are suitable for safe conversion from early self-flowing production to subsequent machine pumping production, and meet the safe construction requirement of later well repair operation, thereby providing a safe, efficient and reliable method and string technology for oil and gas development.

[0034] The operation string and construction method for self-flowing to machine pumping conversion provided by the application can reduce the risk of formation pollution caused by well killing operation, thereby providing a safe and efficient operation string and construction method for oil and gas development, and ensuring the smooth progress of oil and gas production operation. BRIEF DESCRIPTION OF DRAWINGS

[0035] The preferred embodiments of the application will be described in detail below with reference to the accompanying drawings, in which:

[0036] Figure 1 Fig. 1 shows a structure schematic diagram of the operation string for self-flowing to machine pumping conversion of one embodiment of the application, showing the state of the running-in string of completion operation;

[0037] Figure 2 Fig. 2 shows a structure schematic diagram of the operation string for self-flowing to machine pumping conversion of one embodiment of the application, showing the state of packer setting of the running-in string;

[0038] Figure 3 Fig. 3 shows a structure schematic diagram of the operation string for self-flowing to machine pumping conversion of one embodiment of the application, showing the state of well leaving of the lower completion string;

[0039] Figure 4 Fig. 4 shows a structure schematic diagram of the operation string for self-flowing to machine pumping conversion of one embodiment of the application, showing the structure of the self-flowing production string;

[0040] Figure 5 Fig. 5 shows a structure schematic diagram of the operation string for self-flowing to machine pumping conversion of one embodiment of the application, showing the state of the running-in of the pump string;

[0041] Figure 6 Fig. 6 shows a structure schematic diagram of the operation string for self-flowing to machine pumping conversion of one embodiment of the application, showing the state of production of the pump string;

[0042] Figure 7 Fig. 7 shows a structure schematic diagram of the operation string for self-flowing to machine pumping conversion of one embodiment of the application, showing the state of the string for taking out the abnormal opening of the sliding sleeve;

[0043] Figure 8 Fig. 8 shows a structure schematic diagram of the operation string for self-flowing to machine pumping conversion of one embodiment of the application, showing the state of the pump string for abnormal opening of the sliding sleeve.

[0044] The accompanying drawings are not drawn according to the actual scale.

[0045] The meanings of the reference numerals in the drawings are as follows:

[0046] 11, tubing or drill pipe, 12, anchoring seal, 13, lower setting seal device, 14, ball seat,

[0047] 21, tieback spool, 22, sliding sleeve hydraulic line, 23, completion packer, 24, seal nipple, 25, hydraulic sliding sleeve, 26, plug, 27, setting nipple,

[0048] 31, tubing, 32, anchoring seal,

[0049] 41, inner tube, 42, jet pump, 43, inner tube anchoring seal device. DETAILED DESCRIPTION

[0050] In order to make the technical solutions and advantages of the present application clearer, the exemplary embodiments of the present application are further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not an exhaustive enumeration of all embodiments. And in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0051] Currently, the self-flowing string is used as a production string commonly used in the early development of oil and gas wells in the oil industry, which meets the production needs in the early development of oil and gas wells. However, with the continuous development, the change of formation energy, and the late need for mechanical oil production such as pumping and machine mining, the oil and gas resources in the wellbore are continuously exploited. The mechanical oil production method also faces different frequency workover operations in the late stage. When the string of different oil production methods is changed and the late workover operation is performed, well control safety should be fully considered for killing operation.

[0052] Currently, for the change of oil production methods, the existing technology, such as self-flowing and machine mining integrated string, cannot meet the safety operation in the late non-well killing conversion and workover operation. Some technologies only meet the non-well killing completion production under the condition of self-flowing, and cannot meet the late workover and machine mining operation method. For well killing operation, a large amount of liquid in the wellbore will be squeezed into the formation, which will cause a certain degree of damage to the propped fracture and reservoir, and will also affect the formation pressure, causing the safety risk of uncontrolled well pressure.

[0053] To solve the above problems, the present application provides a self-flowing to machine pumping operation string and construction method, which is suitable for safe conversion of early self-flowing production and subsequent machine pumping production of oil wells, and meets the safety construction needs of late workover operation, providing a safe, efficient and reliable method and string technology for oil and gas development.

[0054] In the case of Figure 1In the shown embodiment, a self-spraying and pumping work string comprises:

[0055] a packer assembly which is radially set in the annulus under the action of pressure in the pipe;

[0056] a running tool which is arranged on the tubing or drilling tool 1 and connected to the packer assembly, drives the packer assembly to set after the packer assembly is run to the downhole setting position, and then separates from the packer assembly;

[0057] a tubing 31 which is connected to the packer assembly through a positioning seal 32, so as to realize reservoir reconstruction work and self-spraying production; and

[0058] an inner pipe 41 which is provided with a jet pump 42,

[0059] wherein when the formation pressure is insufficient to support self-spraying production, the inner pipe 41 is connected in the tubing, so as to realize production by pumping work.

[0060] In the self-spraying and pumping work string according to the embodiment, the running tool can be connected to the tubing or drilling tool 1 and can be inserted into the upper end of the packer assembly, the packer is run to the downhole by the tubing or drilling tool 1, and setting is realized by pressing in the pipe, and then the running tool can be released by forward rotation.

[0061] The tubing can be connected to the packer assembly through the positioning seal 32 and reservoir reconstruction work and self-spraying production can be realized. When the formation pressure is insufficient to support self-spraying production, the inner pipe 41 is connected in the tubing, so as to realize production by pumping work.

[0062] In one embodiment, the packer assembly comprises a completion packer 23, the upper end of the completion packer 23 is provided with a back-off sleeve 21, the back-off sleeve 21 can be inserted into the running tool or the positioning seal 32 and connected through threads;

[0063] The running tool or the positioning seal 32 can be separated from the back-off sleeve 21 by forward rotation, so as to realize releasing.

[0064] In the self-spraying and pumping work string according to the embodiment, the back-off sleeve 21 is provided with internal threads, the running tool and the positioning seal 32 are provided with external threads, and the positioning seal 32 has a certain elasticity, can be contracted by elasticity during insertion into the back-off sleeve 21 and connected to the back-off sleeve 21, and then expanded and kept connected to the back-off sleeve 21.

[0065] When separation is needed, the positioning seal 32 is separated from the back-connection cylinder 21 by screwing off the threads of the positioning seal 32 and the back-connection cylinder 21, so that the positioning seal 32 is separated from the back-connection cylinder 21.

[0066] In one embodiment, 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 sliding sleeve 25, the lower end of the hydraulic sliding sleeve 25 is provided with a landing nipple 27.

[0067] Wherein, the hydraulic sliding sleeve 25 can be opened or closed by the pressure in the annulus, the landing nipple 27 is provided with a plug 26, which can block the landing nipple 27 or separate from the landing nipple 27.

[0068] In production operation, the hydraulic sliding sleeve 25 is opened by the pressure in the annulus, the oil in the well enters the pipe through the hydraulic sliding sleeve 25, and under the action of the formation pressure, it enters the upper oil pipe to realize self-flowing production operation.

[0069] When the formation pressure is not low enough to support self-flowing production, the inner tube 41 is connected in the oil pipe to carry out pumping production.

[0070] In one embodiment, the packer assembly is provided with a sliding sleeve hydraulic line 22, the upper end of the sliding sleeve hydraulic line 22 is located above the completion packer 23, and the lower end of the sliding sleeve hydraulic line 22 is connected to the hydraulic sliding sleeve 25.

[0071] The upper end of the sliding sleeve hydraulic line 22 is subjected to the annulus pressure above the completion packer 23, and the sliding sleeve hydraulic line 22 transmits the annulus pressure to the hydraulic sliding sleeve 25 and controls the opening or closing of the hydraulic sliding sleeve 25; or the sliding sleeve hydraulic line 22 can move axially when subjected to the annulus pressure, thereby driving the opening or closing of the hydraulic sliding sleeve 25.

[0072] In this way, the opening or closing of the hydraulic sliding sleeve 25 can be controlled by pressurizing or depressurizing the annulus at the wellhead.

[0073] In one embodiment, the running tool includes an upper anchoring seal 12, the lower end of the anchoring seal 12 is provided with a pipe member extending to the lower end of the completion packer 23, the lower end of the pipe member is provided with a lower positioning sealing device 13, and the inside of the lower end of the pipe member is provided with a ball seat 14.

[0074] Wherein, the upper end of the anchoring seal 12 is connected to the oil pipe or drilling tool 1, and the outer side is provided with threads matched with the back-connection cylinder 21; the lower positioning sealing device 13 is sealingly connected with the sealing nipple 24.

[0075] The pipe element is provided with a flow channel or pressure transmission hole connecting the inside and outside of the pipe element at a position between the lower positioning sealing device 13 and the positioning sealing element 32, so that the pressure in the pipe can be transmitted to the completion packer 23, thereby driving the completion packer 23 to expand and set.

[0076] After the running tool assembles the packer assembly, the lower positioning sealing device 13 is connected with the sealing nipple 24, and the positioning sealing element 32 is connected with the back-off sleeve 21, and then the packer assembly is lowered to a predetermined position in the well through the oil pipe or drilling tool 1. After the ball is put into the pipe and the ball falls into the ball seat 14, the pressure in the pipe is blocked.

[0077] At this time, the oil pipe or drilling tool 1 is pressurized, and the pressure is transmitted to the pipe element of the running tool. Since the lower end of the pipe element is sealed by the lower positioning sealing device 13 and the ball seat 14, the pressure in the inside of the pipe element is transmitted to the completion packer 23, and the completion packer 23 expands and sets on the well wall under the action of the pressure.

[0078] Then, the pressure in the pipe is stopped, and the oil pipe or drilling tool 1 is rotated in the positive direction to separate the anchoring sealing element 12 from the back-off sleeve 21, complete the separation of the running tool and the packer assembly, and realize the release.

[0079] In one embodiment, the lower end of the inner pipe 41 is provided with an inner pipe positioning sealing device 43, and the inner pipe positioning sealing device 43 is provided with external threads, the inside of the positioning sealing element 32 is provided with internal threads, and the inner pipe positioning sealing device 43 is connected with the positioning sealing element 32 through the threads.

[0080] According to another aspect of the present application, a construction method is also provided, which uses the self-flowing swabbing operation pipe string according to the above-mentioned embodiments to perform construction operations.

[0081] In one embodiment, the construction method comprises the following steps:

[0082] The packer assembly is connected with the oil pipe or drilling tool 1 through the running tool to form a running pipe string, and the packer is run into the well through the running pipe string;

[0083] The pressure ball is put into the ball seat 14, the completion packer 23 is set and hung in the pipe by pressure blocking, and then the packer sealing test is performed by pressure pressing in the annulus; the running pipe string is taken out after the release by positive rotation;

[0084] The oil pipe is lowered to connect the packer assembly through the positioning sealing element 32 to form a completion pipe string;

[0085] The hydraulic sliding sleeve 25 is opened by controlling the sliding sleeve hydraulic line 22 by pressure pressing in the annulus, and then the reservoir reconstruction operation is performed; and the self-flowing production operation is performed after the reservoir reconstruction operation.

[0086] In a preferred embodiment, when the formation pressure is not low enough to support the self-flowing production, the hydraulic sleeve 25 is closed by controlling the hydraulic sleeve hydraulic line 22, preventing the pressure in the formation from rising;

[0087] After the inner tube 41 is lowered, the hydraulic sleeve 25 is opened by the hydraulic line, and the jet pump 42 is started to perform the pumping production operation.

[0088] In a preferred embodiment, when the well repair operation is needed, the hydraulic sleeve 25 is closed by changing the annular pressure to control the hydraulic sleeve hydraulic line 22, at which time the formation to the pipe pressure can be blocked, and then the inner tube 41 and the tubing are taken out in turn to perform the well repair operation.

[0089] In a preferred embodiment, if the hydraulic sleeve 25 cannot be normally opened, the jet pump 42 is taken out by wireline operation, and then the plug 26 on the landing nipple 27 is taken out, and the jet pump 42 is lowered again to perform the pumping production operation.

[0090] In a specific embodiment, the method comprises:

[0091] The packer assembly is connected to the tubing or drilling tool 1 by the running tool to form a running string, and the packer is sent downhole by the running string, as shown in Figure 1 .

[0092] The pipe string combination is lowered to the designed position, the wellhead throws the pressure holding ball into the ball seat 14, and the well completion packer 23 is set and hung by the pipe pressure holding, as shown in Figure 2 . After the packer is set, the annular pressure is tested, and the packer is tested normally. The hydraulic sleeve 25 is closed by three times of pressure increase and pressure relief through the hydraulic sleeve hydraulic line 22. At this time, the well control risk caused by the formation pressure inside and outside the pipe can be effectively avoided, and the running string can be safely taken out after the positive rotation is released. The lower completion pipe string is left in the wellbore, as shown in Figure 3 .

[0093] The upper completion pipe string with the sealing cylinder and the positioning seal 32 is lowered into the thread in the tieback cylinder 21 to realize the forward insertion locking and sealing. At this time, the hydraulic sleeve 25 is opened by controlling the hydraulic sleeve hydraulic line 22, and the reservoir reconstruction operation can be realized after the opening. After the reservoir reconstruction operation, the self-flowing production can be realized under the action of the formation pressure, and the oil and gas can enter the wellbore to realize the production through the circulation hole in the hydraulic sleeve 25.

[0094] When the formation pressure is not low enough to support the self-flowing production, the hydraulic sleeve 25 can be closed by controlling the hydraulic sleeve hydraulic line 22, which can effectively prevent the pressure in the formation from rising and avoid the well control risk, and the inner tube 41 and the inner tube positioning seal device 43 can be safely lowered and the jet pump 42 can be lowered, as shown inFigure 5 The opening of the sliding sleeve can be achieved through hydraulic lines at this time, and the production of pumping operation is carried out after the opening of the sliding sleeve, as shown in Figure 6 .

[0095] When the well repair operation is needed, the annulus is pressed, and the hydraulic sliding sleeve 25 is closed. At this time, the sealing of the formation to the pipe pressure can be realized, and the inner tube 41, the jet pump 42, the inner tube positioning sealing device 43 and the tubing and positioning sealing element 32 can be taken out in turn to carry out the well repair operation. After the well repair operation is completed, the production of the self-flowing string can be repeated. Figures 4-6

[0096] If the hydraulic sliding sleeve 25 cannot be opened, the jet pump 42 can be taken out by using the wireline operation, and then the plug 26 on the sitting nipple 27 is taken out, as shown in Figure 7 The pumping production operation is restored after the jet pump 42 is lowered again.

[0097] Embodiment 1

[0098] A self-flowing and pumping operation string, comprising:

[0099] a packer assembly which is radially set in the annulus under the action of the pressure in the pipe;

[0100] a running tool which is arranged on the tubing or drilling tool 1 and connected with the packer assembly, drives the packer assembly to set after the packer assembly is sent to the downhole setting position, and then separates from the packer assembly;

[0101] a tubing whose lower end is connected with the packer assembly through a positioning sealing element 32, so as to realize the reservoir reconstruction operation and self-flowing production; and

[0102] an inner tube 41 which is provided with a jet pump 42,

[0103] wherein when the formation pressure is insufficient to support the self-flowing production, the inner tube 41 is connected in the tubing, so as to carry out the pumping operation production.

[0104] The running tool can be connected on the tubing or drilling tool 1 and can be inserted on the upper end of the packer assembly. The packer is sent downhole through the tubing or drilling tool 1, and is set by pressing in the pipe. Then the running tool can be released by forward rotation.

[0105] The tubing can be connected with the packer assembly through the positioning sealing element 32, and the reservoir reconstruction operation and self-flowing production can be carried out. When the formation pressure is insufficient to support the self-flowing production, the inner tube 41 is connected in the tubing, so as to carry out the pumping operation production. ​

[0106] The packer assembly comprises a completion packer 23, the upper end of which is provided with a back-off sleeve 21, which can be plugged with the running tool or the setting seal 32 and connected by threads;

[0107] The running tool or the setting seal 32 can be separated from the back-off sleeve 21 by positive rotation to achieve the release.

[0108] The back-off sleeve 21 is provided with internal threads, the running tool and the setting seal 32 are provided with external threads, and the setting seal 32 has a certain elasticity, which can be contracted by elasticity during plugging with the back-off sleeve 21, and connected with the back-off sleeve 21, and then expanded to maintain connection with the back-off sleeve 21.

[0109] When separation is needed, the threads of the setting seal 32 and the back-off sleeve 21 are tripped by positive rotation, so that the setting seal 32 is separated from the back-off sleeve 21.

[0110] The lower end of the completion packer 23 is provided with a sealing nipple 24, the lower end of which is provided with a hydraulic sliding sleeve 25, the lower end of which is provided with a landing nipple 27.

[0111] Among them, the hydraulic sliding sleeve 25 can be opened or closed by the pressure in the annulus, the landing nipple 27 is provided with a plug 26, which can block the landing nipple 27 or separate from the landing nipple 27.

[0112] During production operation, the hydraulic sliding sleeve 25 is opened by the pressure in the annulus, and the oil in the well enters the pipe through the hydraulic sliding sleeve 25, and enters the upper oil pipe under the action of the formation pressure, realizing self-flowing production operation.

[0113] When the formation pressure is not low enough to support self-flowing production, the inner tube 41 is connected in the oil pipe to carry out pumping production.

[0114] The packer assembly is provided with a sliding sleeve hydraulic line 22, the upper end of which is located above the completion packer 23, and the lower end of which is connected to the hydraulic sliding sleeve 25.

[0115] The upper end of the sliding sleeve hydraulic line 22 is subjected to the annulus pressure above the completion packer 23, and the sliding sleeve hydraulic line 22 transmits the annulus pressure to the hydraulic sliding sleeve 25 and controls the opening or closing of the hydraulic sliding sleeve 25; or the sliding sleeve hydraulic line 22 can move axially when subjected to the annulus pressure, thereby driving the hydraulic sliding sleeve 25 to open or close.

[0116] In this way, the opening or closing of the hydraulic sliding sleeve 25 can be controlled by pressurizing or depressurizing the annulus at the wellhead.

[0117] The running tool comprises an upper anchoring seal 12, the lower end of which is provided with a pipe member extending down to the running of the completion packer 23, the lower end of the pipe member is provided with a lower positioning seal device 13, and the inside of the lower end of the pipe member is provided with a ball seat 14.

[0118] The upper end of the anchoring seal 12 is connected to the tubing or drilling tool 1, and the outer side is provided with threads matched with the tieback spool 21; the lower positioning seal device 13 is sealingly connected with the sealing nipple 24.

[0119] A flow channel or pressure transmission hole connecting the inside and the outside is provided on the pipe member 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, so as to drive the completion packer 23 to expand and set.

[0120] After the running tool assembles the packer assembly, the lower positioning seal device 13 is connected with the sealing nipple 24, the positioning seal 32 is connected with the tieback spool 21, and then the packer assembly is lowered to the predetermined position in the well through the tubing or drilling tool 1. After the ball is dropped into the ball seat 14, the pressure in the pipe is blocked.

[0121] At this time, the tubing or drilling tool 1 is pressurized, and the pressure is transmitted to the pipe member of the running tool. Since the lower end of the pipe member is sealed by the lower positioning seal device 13 and the ball seat 14, the pressure in the inside of the pipe member is transmitted to the completion packer 23, and the completion packer 23 expands and sets on the well wall under the action of the pressure.

[0122] Then, the pressurization in the pipe is stopped, and the tubing or drilling tool 1 is rotated in the positive direction to separate the anchoring seal 12 from the tieback spool 21, complete the separation of the running tool from the packer assembly, and realize the release.

[0123] The lower end of the inner pipe 41 is provided with an inner pipe positioning seal device 43, and the inner pipe positioning seal device 43 is provided with external threads, the inside of the positioning seal 32 is provided with internal threads, and the inner pipe positioning seal device 43 is connected with the positioning seal 32 through the threads.

[0124] Example 2

[0125] A construction method using the self-flowing swabbing operation string according to example 1 to perform construction operation.

[0126] The construction method comprises the following steps:

[0127] The packer assembly is connected to the tubing or drilling tool 1 by the running-in tool to form a running-in pipe string, and the packer is run into the well through the running-in pipe string;

[0128] The pressure ball is put into the ball seat 14, the tubing pressure is built up, the setting and hanging packer 23 is completed, and then the annulus is pressured to perform the packer sealing test operation; the running-in pipe string is taken out after the positive rotation and releasing;

[0129] The tubing is run in to connect the packer assembly through the positioning seal 32 to form a completion pipe string;

[0130] The hydraulic sliding sleeve 25 is opened by controlling the sliding sleeve hydraulic line 22 through the annulus pressure, and then the reservoir modification operation is performed; the self-flow production operation is performed after the reservoir modification operation.

[0131] When the formation pressure is reduced and cannot support the self-flow production, the hydraulic sliding sleeve 25 is closed by controlling the sliding sleeve hydraulic line 22 to prevent the pressure in the formation from rising;

[0132] Then the inner tube 41 is run in, the hydraulic sliding sleeve 25 is opened through the hydraulic line, and the jet pump 42 is started to perform the pump production operation.

[0133] When the workover operation is needed, the hydraulic sliding sleeve 25 is closed by changing the annulus pressure to control the sliding sleeve hydraulic line 22, at this time, the formation can be blocked to the tubing pressure, and then the inner tube 41 and the tubing are taken out in sequence to perform the workover operation.

[0134] If the hydraulic sliding sleeve 25 cannot be normally opened, the jet pump 42 is taken out by using the wireline operation, then the plug 26 on the setting nipple 27 is taken out, and the jet pump 42 is run in again to perform the pump production operation.

[0135] It should be understood that the embodiments disclosed in the present application are not limited to the specific structure, processing steps or materials disclosed herein, but should extend to equivalent alternatives of these features understood by those skilled in the relevant art. It should also be understood that the terms used herein are only for the purpose of describing specific embodiments and do not mean limitation.

[0136] In the description of the application, unless otherwise stated, the meaning of "a plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "back end", "head", "tail" and the like, indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0137] In the description of the application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0138] Certain terms are used throughout the present application to refer to particular system components. As one skilled in the art will appreciate, the same component can be referred to by different names and can not be referred to as such throughout the present application. The description of the specification refers to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Therefore, the phrases "one embodiment" or "an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment.

[0139] Embodiments of the present application are given for illustrative and descriptive purposes only and are not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Embodiments are chosen and described in order to best explain the principles of the application and its practical application, and to enable others skilled in the art to understand the application in order to design various embodiments with various modifications as suitable for particular uses.

[0140] Although preferred embodiments of the application have been described, those skilled in the art, once aware of the basic inventive concept, can make additional changes and modifications to these embodiments. Therefore, the appended claims are intended to include the preferred embodiments and all changes and / or modifications falling within the scope of the application, and changes and / or modifications made to embodiments according to the application shall be covered within the scope of protection of the application.

Claims

1. A working string for a self-flowing rotary pump, characterized in that, include: A packer assembly that is radially seated in the annulus under pressure within the tube; The delivery tool is set on the tubing or drill string (1) and connected to the packer assembly. After the packer assembly is delivered to the set position downhole, the packer assembly is driven to set and then separated from the packer assembly. The tubing (31), the lower end of which is connected to the packer assembly via a positioning seal (32), thereby enabling reservoir stimulation operations and self-flowing production; and Inner tube (41), on which a jet pump (42) is provided; When the formation pressure is reduced to an insufficient level to support self-flowing production, the inner tube (41) is connected to the tubing (31) to carry out pumping operations; the packer assembly includes a completion packer (23); the lower end of the completion packer (23) is provided with a sealing sub (24), the lower end of the sealing sub (24) is provided with a hydraulic sliding sleeve (25), and the lower end of the hydraulic sliding sleeve (25) is provided with a settling sub (27). The hydraulic sleeve (25) can be opened or closed by the pressure in the annulus, and a plug (26) is provided on the landing section (27), which can block the landing section (27) or separate from the landing section (27); The packer assembly is provided with a sliding sleeve hydraulic line (22), the upper end of which is located above the well completion packer (23), and the lower end of which is connected to the hydraulic sliding sleeve (25). The upper end of the sliding sleeve hydraulic line (22) is subjected to annular pressure, thereby driving the hydraulic sliding sleeve (25) to open or close.

2. The working string for the self-flowing rotary pump according to claim 1, characterized in that, The upper end of the well completion packer (23) is provided with a return tube (21), which is used to connect the delivery tool or the positioning seal (32). The feeding tool or the positioning seal (32) is connected to the return cylinder (21) by a thread and can be separated from the return cylinder (21) by rotating in the forward direction, thus allowing the user to release the device.

3. The working string for the self-flowing rotary pump according to claim 2, characterized in that, The delivery tool includes an upper anchoring seal (12), and the lower end of the anchoring seal (12) is provided with a pipe extending to the well completion packer (23). The lower end of the pipe is provided with a lower positioning sealing device (13), and the lower end of the pipe is provided with a ball seat (14).

4. The working string for the self-flowing rotary pump according to claim 3, characterized in that, The outer side of the anchoring seal (12) is provided with a thread that connects to the return cylinder (21), and the lower positioning sealing device (13) is sealed to the sealing short section (24). The fitting has pressure transmission holes or channels that can transmit the pressure inside the pipe to the completion packer (23); After the ball is inserted, it falls into the ball seat (14) and seals the lowering of the pipe fitting. The pressure inside the pipe drives the well completion packer (23) to set.

5. The working string for the self-flowing rotary pump according to claim 4, characterized in that, The lower end of the inner tube (41) is provided with an inner tube positioning and sealing device (43), and the inner tube positioning and sealing device (43) is provided with an external thread. The positioning seal (32) is provided with an internal thread. The inner tube positioning and sealing device (43) and the positioning seal (32) are connected by threads.

6. A construction method, characterized in that, Construction operations are carried out using the working pipe string provided by the self-flowing rotary pump according to any one of claims 1 to 5.

7. The construction method according to claim 6, characterized in that, include: The packer assembly is connected to the tubing or drill string (1) by the delivery tool to form a delivery string, and the packer is delivered downhole through the delivery string; The pressure-retaining ball is dropped into the ball seat (14), and the well packer (23) is set in the pipe under pressure. Then, the packer is tested for sealing by pressurizing in the annulus. After turning forward and letting go, it is taken out and sent into the tubing string. The tubing is lowered and connected to the packer assembly via a positioning seal (32) to form a completion string; The hydraulic sleeve (25) is opened by controlling the hydraulic line (22) of the sleeve by pressurizing the annulus, and then reservoir modification operation is carried out. After reservoir modification operations, self-flowing production operations are carried out.

8. The construction method according to claim 7, characterized in that, When the formation pressure drops to a level insufficient to support self-flowing production, the hydraulic sleeve (25) is closed by controlling the hydraulic line (22) of the sleeve to prevent the pressure in the formation from rising. Then, the inner tube (41) is lowered in, the hydraulic sleeve (25) is opened through the hydraulic pipeline, and the jet pump (42) is started to carry out pumping production operation.

9. The construction method according to claim 8, characterized in that, When well workover is required, the hydraulic sleeve (25) is closed by changing the annular pressure and controlling the hydraulic line (22). At this time, the pressure from the formation into the pipe can be blocked. Then, the inner pipe (41) and the tubing (31) are taken out in sequence before well workover is carried out.

10. The construction method according to claim 9, characterized in that, If the hydraulic sleeve (25) cannot be opened normally, the jet pump (42) is removed by wire rope operation. Then, the plug (26) located on the short section (27) is removed, and the jet pump (42) is put back in for pumping production.

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