Intelligent filling sand prevention process tubular column with immovable tubular column and implementation method of intelligent filling sand prevention process tubular column with immovable tubular column

Abstract

The invention discloses an immovable pipe column intelligent filling sand prevention process pipe column and an implementation method. The tubular column comprises a tubing hanger, a throwing and fishing electric pump assembly, a large-drift-diameter safety valve, a heel production tubing, an intelligent regulation and control reverse circulation switch valve, a bypass flow guide suspension packer, an intelligent regulation and control filling sliding sleeve, an intelligent regulation and control stratum isolation valve, a production tubing set and a blind plug which are sequentially connected from top to bottom. The implementation method comprises the steps of well completion pipe string tripping-in, immovable pipe string filling sand prevention, immovable pipe string reverse circulation well washing, immovable pipe string production channel switching, overhaul operation and the like. According to the invention, a filling sand prevention well completion pipe column and a production pipe column are integrated into one pipe column, and the filling sand prevention of the immovable pipe column, the reverse circulation well washing of the immovable pipe column, the sand washing well washing of the immovable pipe column and the fishing of the whole well completion pipe column are realized by adopting an electric control or hydraulic control intelligent well completion tool; and the automation degree and the operation efficiency of filling sand prevention and later-stage workover operation are improved, and the construction operation risk and the labor intensity of workers are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas field development, and particularly relates to an intelligent filling sand control process string without pulling the pipe string and an implementation method thereof. Background Art

[0002] Most of the offshore oil well completions adopt gravel packing sand control methods. During the completion sand control operation stage, most of the conventional filling sand control process strings are mechanical structures, with complex tool structures and many construction operation procedures. The gravel filling sand control operation accounts for more than 50% of the entire completion operation time. Moreover, the sand control pipe string and the production pipe string are run in as two separate pipe strings, resulting in a long occupation time of the drilling rig, high completion operation costs, high requirements for the operation skills of the operators during the filling operation, high labor intensity, and increased construction operation risks due to tool failures or operation errors. When major repair operations are required in the later stage of oil well production, after pulling out the production pipe string, sectional milling, cutting and fishing operations are often carried out, with long work hours for the workover operation and high requirements for the experience of the workover operators. Summary of the Invention

[0003] The present invention is proposed to solve the problems existing in the prior art, such as long time for completion filling sand control operation and later workover operation, high construction operation risk, high manual labor intensity, and complex construction operation procedures. Its purpose is to provide an intelligent filling sand control process string without pulling the pipe string and an implementation method thereof.

[0004] The present invention is realized through the following technical solutions:

[0005] An intelligent filling sand control process string without pulling the pipe string includes, from top to bottom in sequence, a tubing hanger, a retrievable electric pump assembly, a large-diameter safety valve, a heel production tubing, an intelligent control reverse circulation switch valve, a bypass diversion hanging packer, an intelligent control filling sleeve, an intelligent control formation isolation valve, a production tubing group, and a blind plug; the production tubing group includes a toe production tubing and a sand control screen pipe sleeved inside and outside, and a production channel control valve is arranged at one end of the toe production tubing close to the blind plug; the retrievable electric pump assembly includes an upper production casing with two ends respectively connected to the tubing hanger and the large-diameter safety valve, a retrievable electric pump arranged inside the upper production casing, and an isolation packer arranged between the retrievable electric pump and the inner wall of the upper production casing; the isolation packer is fixed to the inner wall of the upper production casing; a large-diameter isolation sealing tool is arranged between the outer wall of the upper production casing and the wellbore casing; the intelligent control reverse circulation switch valve, the bypass diversion hanging packer, the intelligent control filling sleeve, the intelligent control formation isolation valve, the large-diameter isolation sealing tool, and the large-diameter safety valve are all connected to the ground control mechanism through cables.

[0006] In the above technical solution, the intelligent control reverse circulation switch valve, bypass diversion hanging packer, intelligent control filling sliding sleeve, intelligent control formation isolation valve, and production channel control valve are connected to the ground control mechanism through the No. II cable and are connected in parallel; the large-diameter isolation sealing tool is connected to the ground control mechanism through the No. I cable, and the large-diameter safety valve is connected to the ground control mechanism through the No. III cable.

[0007] In the above technical solution, the No. I cable, No. II cable, and No. III cable are all liquid control pipelines or cables.

[0008] In the above technical solution, a liquid passing channel that can be intelligently controlled to open and close is provided on the outer wall of the intelligent control reverse circulation switch valve.

[0009] In the above technical solution, the bypass diversion hanging packer is tightly connected and sealed with the wellbore casing, and a cable passing channel is provided inside.

[0010] In the above technical solution, the intelligent control filling sliding sleeve is provided with a filling hole channel that is isolated from the bypass liquid passing channel B, and the filling hole channel is opened and closed by an electric control or liquid control method.

[0011] In the above technical solution, a ball valve is provided inside the intelligent control formation isolation valve, and the ball valve rotates by an electric control or liquid control method.

[0012] An implementation method of a work string for intelligent filling and sand control without pulling the pipe string includes the following steps:

[0013] a) Well completion string lowering stage

[0014] Lower the entire work string for intelligent filling and sand control without pulling the pipe string except for the retrievable electric pump to the target formation; the large-diameter safety valve, intelligent control reverse circulation switch valve, intelligent control filling sliding sleeve, intelligent control formation isolation valve, and production channel control valve are in the open state. After lowering in place, close the intelligent control formation isolation valve and set the bypass diversion hanging packer.

[0015] b) Filling and sand control stage

[0016] Add sand inside the pipe string to fill ultra-light particles. The sand-carrying fluid flows through the through-type circular liquid passing channel, enters the annulus between the wellbore and the sand control screen pipe through the filling hole channel of the intelligent control filling sliding sleeve, and the fluid filtered by the sand control screen pipe flows through the production channel control valve and enters the inner part of the toe production tubing, returns to the intelligent control formation isolation valve, then returns to the intelligent control reverse circulation switch valve through the bypass liquid passing channel, and finally enters the annulus between the work string for intelligent filling and sand control without pulling the pipe string and the wellbore casing and circulates out of the well.

[0017] c) Reverse circulation well flushing stage

[0018] Close the production channel control valve and the filling hole of the intelligent control filling sliding sleeve, open the intelligent control formation isolation valve, and pump fluid into the annulus between the intelligent filling sand control string of the non-movable pipe string and the wellbore casing from the wellhead. The fluid flows through the intelligent control reverse circulation switch valve and enters the inner part of the toe production tubing through the bypass fluid passage, and then circulates out of the well through the through-type circular fluid passage, cleaning the ultra-light particles above the intelligent control formation isolation valve;

[0019] d) Commissioning preparation stage

[0020] Open the production channel control valve, close the fluid passage of the intelligent control reverse circulation switch valve and the setting large-diameter isolation sealing tool, lower a retrievable electric pump into the inner part of the upper production casing 1, and achieve sealing with the upper production casing through the isolation packer;

[0021] e) Production stage

[0022] The formation-produced liquid enters the inner part of the completion string through the sand control screen pipe, enters the inner part of the toe production tubing through the production channel control valve, and is produced out of the well through the through-type circular fluid passage;

[0023] f) Major repair operation

[0024] Pull out the retrievable electric pump, release the large-diameter isolation sealing tool and the bypass diversion hanging packer, open the filling hole of the intelligent control filling sliding sleeve and the fluid passage of the intelligent control reverse circulation switch valve, close the intelligent control formation isolation valve, and pump fluid into the annulus between the intelligent filling sand control string of the non-movable pipe string and the wellbore casing from the wellhead. The fluid flows through the intelligent control reverse circulation switch valve and enters the inner part of the toe production tubing through the bypass fluid passage, then enters the annulus between the sand control screen pipe and the wellbore and flows upward, carrying ultra-light particles through the filling hole of the intelligent control filling sliding sleeve into the through-type circular fluid passage and flowing upward and circulating out of the well, cleaning the ultra-light particles filled in the annulus between the sand control screen pipe and the wellbore, and then pull out the completion string.

[0025] The beneficial effects of the present invention are:

[0026] The present invention provides an intelligent filling sand control string of non-movable pipe string and an implementation method, which integrates the filling sand control completion string and the production string into one string. By using electric control or hydraulic control intelligent completion tools, it realizes non-movable pipe string filling sand control, non-movable pipe string reverse circulation well washing, non-movable pipe string sand washing well washing and overall completion string fishing, improves the automation degree and operation efficiency of filling sand control and later major repair well operations, and reduces the construction operation risk and personnel labor intensity. Brief description of the drawings

[0027] Figure 1 is the structural schematic diagram of the present invention;

[0028] Figure 2It is a schematic diagram of the fishing electric pump assembly in the present invention;

[0029] Figure 3 It is a partial enlarged view of tools such as the intelligent control reverse circulation switch valve in the present invention;

[0030] Figure 4 It is a schematic diagram of the fluid flow direction during the filling operation in the present invention;

[0031] Figure 5 It is a schematic diagram of the fluid flow direction during the reverse circulation well washing operation in the present invention;

[0032] Figure 6 It is a schematic diagram of the fluid flow direction in the production state of the present invention;

[0033] Figure 7 It is a schematic diagram of the fluid flow direction during the sand washing and well washing operation in the present invention;

[0034] Figure 8 It is a structural schematic diagram of the intelligent control reverse circulation switch valve in the present invention;

[0035] Figure 9 It is a structural schematic diagram of the bypass diversion hanging packer in the present invention;

[0036] Figure 10 It is a structural schematic diagram of the intelligent control filling sliding sleeve in the present invention;

[0037] Figure 11 It is a structural schematic diagram of the intelligent control formation isolation valve in the present invention.

[0038] Wherein:

[0039] 1. Tubing hanger; 2. Large-diameter isolation and sealing tool;

[0040] 3. Fishing electric pump assembly;

[0041] 31. Upper production casing; 32. Retrievable electric pump; 33. Isolation packer;

[0042] 4. Large-diameter safety valve; 5. Cable Ⅰ; 6. Cable Ⅱ; 7. Cable Ⅲ; 8. Wellbore casing;

[0043] 9. Intelligent control reverse circulation switch valve;

[0044] 91. Switch valve liquid flow channel; 92. Switch liquid passage; 93. Switch valve central channel; 94. Switch actuator; 95. Plug-in seal;

[0045] 10. Bypass diversion hanging packer;

[0046] 101. Isolator body; 102. Packer central channel; 103. Slip; 104. Rubber barrel; 105. Packer liquid flow channel; 106. Packer wire threading channel;

[0047] 11. Intelligent control filling sliding sleeve;

[0048] 111. Sliding sleeve body; 112. Sliding sleeve central channel; 113. Sliding sleeve liquid flow channel; 114. Sliding sleeve wire threading channel; 115. Filling channel;

[0049] 12. Intelligent control formation isolation valve;

[0050] 121. Isolation valve body; 122. Isolation valve central channel; 123. Ball valve; 124. Isolation valve liquid flow channel; 125. Isolation valve wire threading channel;

[0051] 13. Toe production tubing; 14. Sand control screen pipe; 15. Production channel control valve; 16. Blind plug; 17. Heel production tubing; A. Through-type circular liquid flow channel; B. Bypass liquid flow channel.

[0052] For those of ordinary skill in the art, without creative efforts, other relevant drawings can be obtained based on the above drawings. Detailed implementation manners

[0053] In order to enable those skilled in the art of this technology to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below in conjunction with the drawings of the specification and through specific implementation manners.

[0054] As Figure 1 shown, a workstring for intelligent filling sand control technology without pulling the tubing string includes a tubing hanger 1, a fishing and pumping unit 3, a large-diameter safety valve 4, a heel production tubing 17, an intelligent control reverse circulation switch valve 9, a bypass diversion suspension packer 10, an intelligent control filling sliding sleeve 11, an intelligent control formation isolation valve 12, a production tubing string, and a blind plug 16, which are connected in sequence from top to bottom;

[0055] As Figure 2 shown, the fishing and pumping unit 3 includes an upper production casing 31 with two ends respectively connected to the tubing hanger 1 and the large-diameter safety valve 4, a retrievable electric pump 32 arranged inside the upper production casing 31, and an isolation packer 33 arranged between the retrievable electric pump 32 and the inner wall of the upper production casing 31; the isolation packer 33 is fixed to the inner wall of the upper production casing 31; a large-diameter isolation sealing tool 2 is arranged between the outer wall of the upper production casing 31 and the wellbore casing 8;

[0056] The production tubing string includes a toe production tubing 13 and a sand control screen pipe 14 which are sleeved inside and outside. A production channel control valve 15 is arranged at one end of the toe production tubing 13 close to the blind plug 16. The sand control screen pipe 14 is fixedly connected and sealed with the intelligent control formation isolation valve 12 and the blind plug 16. The toe production tubing 13 is fixedly connected and sealed with the intelligent control formation isolation valve 12.

[0057] The intelligent control reverse circulation switch valve 9, the bypass diversion hanging packer 10, the intelligent control filling sleeve 11, the intelligent control formation isolation valve 12 and the production channel control valve 15 are connected to the ground control mechanism through the No. II cable 6 and are connected in parallel. The large-diameter isolation and sealing tool 2 is connected to the ground control mechanism through the No. I cable 5, and the large-diameter safety valve 4 is connected to the ground control mechanism through the No. III cable 7. The No. I cable 5, the No. II cable 6 and the No. III cable 7 are all hydraulic control pipelines or cables.

[0058] As Figure 3 、 8 As shown, an on-off valve liquid flow channel 91 is formed axially on the outer wall of the intelligent control reverse circulation switch valve 9. A switch liquid passing channel 92 is formed radially on the outer wall of the on-off valve liquid flow channel 91. A switch actuator 94 connected to the No. II cable 6 is arranged in the on-off valve liquid flow channel 91. The ground control mechanism drives the switch actuator 94 through the No. II cable 6 to realize the opening and closing of the switch liquid passing channel 92. The intelligent control reverse circulation switch valve 9 is inserted into the bypass diversion hanging packer 10, and an insertion seal 95 is arranged between them.

[0059] As Figure 3 、 9 As shown, the bypass diversion hanging packer 10 is inserted into the intelligent control filling sleeve 11, and an insertion seal is arranged between them. The bypass diversion hanging packer 10 includes an isolator body 101 with a packer central channel 102 formed in the center. A slip 103 and a rubber cylinder 104 are arranged outside the isolator body 101. An on-off valve liquid flow channel 105 and a packer wire passing channel 106 are formed axially on the pipe wall of the isolator body 101. The No. II cable 6 passes through the packer wire passing channel 106.

[0060] As Figure 3 、 10As shown, the intelligent control filling sleeve 11 is inserted into the intelligent control formation isolation valve 12, and an insertion seal is provided therebetween. The intelligent control filling sleeve 11 includes a sleeve body 111 with a sleeve central channel 112 formed in the center. The pipe wall of the sleeve body 111 forms a sleeve liquid flow channel 113 and a sleeve wire threading channel 114 axially opened. The sleeve liquid flow channel 113 forms a filling channel 115 radially opened. The filling channel 115 communicates the sleeve central channel 112 with the annulus outside the intelligent control filling sleeve 11. The filling channel 111 is opened and closed by electric control or hydraulic control.

[0061] As Figure 3 、 11 As shown, the intelligent control formation isolation valve 12 is inserted into the production tubing string, and an insertion seal is provided therebetween. The intelligent control formation isolation valve 12 includes an isolation valve body 121 with an isolation valve central channel 122 formed in the middle. The pipe wall of the isolation valve body 121 forms an isolation valve liquid flow channel 124 and an isolation valve wire threading channel 125 axially opened. A ball valve 123 is provided at one end of the isolation valve central channel 122 close to the production tubing string. The ball valve 123 is connected to the No. II cable 6 and is rotated by electric control or hydraulic control to open and close the isolation valve central channel 122.

[0062] The middle channels of the large-diameter isolation and sealing tool 2, the upper production casing 31, the large-diameter safety valve 4, the switch valve central channel 93 of the intelligent control reverse circulation switch valve 9, the packer central channel 102 of the bypass diversion hanging packer 10, the sleeve central channel 112 inside the intelligent control filling sleeve 11, and the isolation valve central channel 122 communicate with each other to form a through-type circular liquid flow channel A.

[0063] The switch valve liquid flow channel 91 of the intelligent control reverse circulation switch valve 9, the packer liquid flow channel 105 of the bypass diversion hanging packer 10, the sleeve liquid flow channel 113 of the intelligent control filling sleeve 11, and the isolation valve liquid flow channel 124 of the intelligent control formation isolation valve 12 communicate with each other to form a bypass liquid flow channel B, which is isolated from the internal through-type circular liquid flow channel A and the annulus between the pipe string and the wellbore.

[0064] The large-diameter isolation and sealing tool 2, the intelligent control reverse circulation switch valve 9, the intelligent control filling sleeve 11, the intelligent control formation isolation valve 12, and the production channel control valve 15 open and close the liquid flow channel by driving the internal motor of the tool with a cable or driving the internal piston cavity of the tool with a hydraulic control pipeline.

[0065] The large-diameter isolation and sealing tool 2 and the bypass diversion hanging packer 10 are set and released by driving the internal motor of the tool with a cable or driving the internal piston cavity of the tool with a hydraulic control pipeline.

[0066] Embodiment 2

[0067] An implementation method of a non-moving string intelligent filling sand control string, comprising the following steps:

[0068] a) Well completion string running-in stage

[0069] The entire non-moving string intelligent filling sand control string (except the retrievable electric pump 32) is run into the target formation. The large-diameter safety valve 4, intelligent control reverse circulation switch valve 9, intelligent control filling sleeve 11, intelligent control formation isolation valve 12, and production channel control valve 15 are in the open state. After running in place, the intelligent control formation isolation valve 12 is closed, and the bypass diversion hanging packer 10 is set;

[0070] b) Filling sand control stage

[0071] As Figure 4 shown, by adding sand inside the string, ultra-light particles (true density is 0.9 - 1.1 g / cm 3 ) are filled. The sand-carrying fluid flows through the large-diameter isolation sealing tool 2, upper production casing 31, etc. to form a through-type circular fluid passage A inside, and enters the annulus between the wellbore and the sand control screen pipe 14 through the filling hole 111 of the intelligent control filling sleeve 11. The fluid filtered by the sand control screen pipe 14 flows through the production channel control valve 15 into the inner part of the toe production tubing 13, returns to the intelligent control formation isolation valve 12, and then returns to the intelligent control reverse circulation switch valve 9 through the bypass fluid passage B provided inside the side wall of the intelligent control formation isolation valve 12, and then enters the annulus between the non-moving string intelligent filling sand control string and the wellbore casing 8 to circulate out of the well;

[0072] c) Reverse circulation well flushing stage

[0073] As Figure 5 shown, the production channel control valve 15 is closed in an electric control or hydraulic control manner, the filling hole 111 of the intelligent control filling sleeve 11 is closed, the intelligent control formation isolation valve 12 is opened, and fluid is pumped into the annulus between the non-moving string intelligent filling sand control string and the wellbore casing 8 from the wellhead ([[]] Figure 5 the fluid movement direction shown by the red arrow), the fluid flows through the intelligent control reverse circulation switch valve 9, bypass fluid passage B into the inner part of the toe production tubing 13 ([[]] Figure 5 the fluid movement direction shown by the red arrow in), and then flows through the intelligent control formation isolation valve 12 and other internal to form a through-type circular fluid passage A to circulate out of the well Figure 5 the fluid movement direction shown by the green arrow), and the ultra-light particles above the intelligent control formation isolation valve 12 are cleaned;

[0074] d) Production preparation stage

[0075] Open the production channel control valve 15 in an electric control or hydraulic control mode, close the liquid passing channel 91 of the intelligent control reverse circulation switch valve 9 and the setting large-diameter isolation and sealing tool 2, lower the retrievable electric pump 32 inside the production casing 31, and achieve sealing with the production casing 31 through the isolation packer 33;

[0076] e) Production stage

[0077] As Figure 6 shown, the formation-produced liquid enters the annulus between the screen pipe and the production tubing through the sand control screen pipe 14 ( Figure 6 as shown by the gray arrow), enters the interior of the toe production tubing 13 through the production channel control valve 15, and is produced out of the well through the intelligent control formation isolation valve 12 and other internal to form a through-type circular liquid passing channel A ( Figure 6 as shown by the green arrow);

[0078] f) Major repair operation

[0079] As Figure 7 shown, retrieve the retrievable electric pump 32, release the large-diameter isolation and sealing tool 2 and the bypass diversion hanging packer 10 in an electric control or hydraulic control mode, open the filling hole 111 of the intelligent control filling sleeve 11 and the liquid passing channel 91 of the intelligent control reverse circulation switch valve 9, close the intelligent control formation isolation valve 12, pump fluid into the annulus between the intelligent filling sand control string and the wellbore casing 8 from the wellhead. The fluid flows through the intelligent control reverse circulation switch valve 9, enters the interior of the toe production tubing 13 through the bypass liquid passing channel B (green arrow), then enters the annulus between the sand control screen pipe 14 and the wellbore casing 8 and flows upward, carries the ultra-light particles and flows through the filling hole 111 of the intelligent control filling sleeve 11 into the bypass diversion hanging packer 10 and other internal to form a through-type circular liquid passing channel A and flows upward and circulates out of the well (red arrow), cleans the ultra-light particles filled in the annulus between the sand control screen pipe 14 and the wellbore, and then retrieve the completion string.

[0080] Application example 1

[0081] For the conventional completion and filling sand control method, nearly 20 operation steps such as assembling and lowering the sand control string, setting the packer, checking the slips, releasing, checking the seal, marking the reverse circulation position, filling sand control, and reverse circulation well flushing are required. Most of the operation process is achieved by internal pressure pumping, running and pulling the pipe string, etc. After the filling operation, a separate string is lowered into the production string. The completion cycle is about 5 - 7 days, and about 20 operators are required.

[0082] Using the intelligent sand control and packing work string without pulling out the pipe string of the present invention, the sand control work string and the production work string are integrated and lowered into the target formation as a whole. The large-diameter safety valve 4, the intelligent control reverse circulation switch valve 9, the intelligent control packing sleeve 11, the intelligent control formation isolation valve 12, and the production channel control valve 15 are in the open state. After being lowered in place, it remains in the original position without operations such as pulling out and running in the pipe string, releasing, and marking the reverse circulation position. Only ground control is adopted, and the intelligent control formation isolation valve 12 is adjusted to be closed through the No. II cable 6, and the bypass diversion hanging packer 10 is set, and then the packing operation is carried out. During the packing operation, sand is added through the inside of the work string, and ultra-light particles (true density is 0.9-1.1 g / cm 3 ) are packed. The sand-carrying fluid flows through the inside of the large-diameter isolation and sealing tool 2, the upper production casing 31, etc. to form a through-type circular liquid passage A, enters the annulus between the wellbore and the sand control screen pipe 14 through the packing hole 111 of the intelligent control packing sleeve 11, and the fluid filtered by the sand control screen pipe 14 flows through the production channel control valve 15 into the inner part of the toe production tubing 13, returns to the intelligent control formation isolation valve 12, and then returns to the intelligent control reverse circulation switch valve 9 through the bypass liquid passage B provided inside the side walls such as the intelligent control formation isolation valve 12, and then enters the annulus between the intelligent sand control and packing work string without pulling out the pipe string and the wellbore casing 8 and circulates out of the well. After the packing operation is completed, there is no need to move the work string. The production channel control valve 15 is closed by electric control or hydraulic control, the packing hole 111 of the intelligent control packing sleeve 11 is closed, the intelligent control formation isolation valve 12 is opened, and fluid is pumped into the annulus between the work string and the wellbore casing 8 from the wellhead to realize reverse circulation well flushing. After the well flushing is completed, there is no need to run in a separate trip of drill pipe to lower the production work string. The production channel control valve 15 is opened by electric control or hydraulic control, the liquid passage of the intelligent control reverse circulation switch valve 9 is closed, and the large-diameter isolation and sealing tool 2 is set. The retrievable electric pump 32 is lowered into the upper production casing 31, and then the production process can be converted. The whole operation process takes about 3 days, requires about 5 operators, improves the automation degree and operation efficiency of sand control and packing, reduces the construction operation risk and the labor intensity of personnel, reduces the operation time by more than 40% compared with the conventional completion operation cycle, reduces the drilling rig occupation time, and has remarkable economic benefits.

[0083] Application Example 2

[0084] In the conventional sand control method for completion of filled wells, during the later production stage, due to the decline in production capacity or the failure of the completion string, workover operations need to be carried out. Due to reasons such as the external ceramic particle filling layer of the completion string and the collapse of the formation, the sand control string cannot be retrieved as a whole. The conventional operation method is to carry out segmented milling, cutting and fishing operations after pulling out the production string. The workover operation time is usually 20 - 40 days, requiring more than 10 on-site operators, with relatively high requirements for the experience of workover operators and high operation costs. By using the intelligent filling sand control process string without pulling out the string of the present invention, the retrievable and throwable electric pump 32 can be pulled out during the operation, the large-diameter isolation sealing tool 2 and the bypass diversion hanging packer 10 can be released by electric control or hydraulic control, the filling channel 111 of the intelligent control filling sleeve 11 and the liquid passing channel of the intelligent control reverse circulation switch valve 9 are opened, the intelligent control formation isolation valve 12 is closed, and fluid is pumped into the annulus between the intelligent filling sand control process string without pulling out the string and the wellbore casing 8 from the wellhead. The fluid flows through the intelligent control reverse circulation switch valve 9 and enters the inner part of the toe production tubing 13 through the bypass liquid passing channel B, then flows upward in the annulus between the sand control screen pipe 14 and the wellbore, carries ultralight particles and flows through the filling channel 111 of the intelligent control filling sleeve 11 into the inside of the bypass diversion hanging packer 10, etc. to form a through-type circular liquid passing channel A and flows upward and circulates out of the well, cleaning the ultralight particles filled in the annulus between the sand control screen pipe 14 and the wellbore. Then, the whole completion string is pulled out to the wellhead, the completion string or some damaged tools are replaced. The workover operation time is usually 5 - 7 days, requiring about 5 operators, improving the workover operation efficiency, reducing the construction operation risk and the labor intensity of personnel, ensuring the integrity of downhole tools, reducing the operation cost, and having significant economic benefits.

[0085] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0086] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0087] The applicant declares that the above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by any person skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A pipe column for intelligent filling and sand control technology with fixed pipe column, characterized in that: The invention comprises a tubing hanger (1), a salvage electric pump assembly (3), a large-diameter safety valve (4), a heel production tubing (17), an intelligently controlled reverse circulation switch valve (9), a bypass diversion suspension packer (10), an intelligently controlled filling sleeve (11), an intelligently controlled formation isolation valve (12), a production tubing group and a blind plug (16) which are connected in sequence from top to bottom; the production tubing group comprises a toe production tubing (13) and a sand control screen (14) which are arranged inside and outside, and a production channel control valve (15) is arranged at one end of the toe production tubing (13) close to the blind plug (16); the salvage electric pump assembly (3) comprises an upper production tubing (17) having two ends respectively connected to the tubing hanger (1) and the large-diameter safety valve (4); A production casing (31), a salvageable electric pump (32) arranged inside the upper production casing (31), and an isolation packer (33) arranged between the salvageable electric pump (32) and the inner wall of the upper production casing (31); the isolation packer (33) is fixed to the inner wall of the upper production casing (31); a large-diameter isolation sealing tool (2) is arranged between the outer wall of the upper production casing (31) and the wellbore casing (8); the intelligent control reverse circulation switch valve (9), the bypass diversion suspension packer (10), the intelligent control filling sleeve (11), the intelligent control formation isolation valve (12), the large-diameter isolation sealing tool (2) and the large-diameter safety valve (4) are all connected to a ground control mechanism via cables.

2. The immovable pipe column intelligent filling sand control process pipe column according to claim 1 is characterized in that: The intelligent control reverse circulation switch valve (9), bypass diversion suspension packer (10), intelligent control filling sleeve (11), intelligent control formation isolation valve (12) and production channel control valve (15) are connected to the ground control mechanism via No. II cable (6) and are connected in parallel; the large-diameter isolation sealing tool (2) is connected to the ground control mechanism via No. I cable (5), and the large-diameter safety valve (4) is connected to the ground control mechanism via No. III cable (7).

3. The immovable pipe column intelligent filling sand control process pipe column according to claim 2 is characterized in that: The No. Ⅰ cable (5), No. Ⅱ cable (6) and No. Ⅲ cable (7) are all hydraulically controlled pipelines or cables.

4. The immovable pipe column intelligent filling sand control process pipe column according to claim 1 is characterized in that: The outer wall of the intelligent control reverse circulation switch valve (9) forms a switch valve liquid flow channel (91) opened in the axial direction, and the outer wall of the switch valve liquid flow channel (91) forms a switch liquid flow channel (92) opened in the radial direction. A switch actuator (94) connected to the No. II cable (6) is arranged in the switch valve liquid flow channel (91). The ground control mechanism drives the switch actuator (94) through the No. II cable (6) to realize the opening and closing of the switch liquid flow channel (92); the intelligent control reverse circulation switch valve (9) is plugged into the flow-conducting suspension packer (10), and a plug-in seal (95) is arranged between the two.

5. The immovable pipe column intelligent filling sand control process pipe column according to claim 1 is characterized in that: The bypass diversion suspension packer (10) is plugged into the intelligent control filling sleeve (11), and a plug-in seal is arranged between the two; the bypass diversion suspension packer (10) comprises an isolator body (101) whose center forms a packer center channel (102), and a slip (103) and a rubber sleeve (104) are arranged outside the isolator body (101); the pipe wall of the isolator body (101) forms a packer liquid flow channel (105) and a packer threading channel (106) opened along the axial direction, and the No. II cable 6 passes through the packer threading channel (106).

6. The immovable pipe column intelligent filling sand control process pipe column according to claim 1 is characterized in that: The intelligent control filling sleeve (11) is plugged into the intelligent control formation isolation valve (12), and a plug-in seal is arranged between the two; the intelligent control filling sleeve (11) comprises a sleeve body (111) with a sleeve center channel (112) formed in the center; the tube wall of the sleeve body (111) forms a sleeve liquid flow channel (113) and a sleeve threading channel (114) opened in the axial direction; the sleeve liquid flow channel (113) forms a filling channel (115) opened in the radial direction; the filling channel (115) connects the sleeve center channel (112) and the external annulus of the intelligent control filling sleeve (11); the filling channel 111 is opened and closed by electric control or hydraulic control.

7. The immovable pipe column intelligent filling sand control process pipe column according to claim 1 is characterized in that: The intelligent control formation isolation valve (12) is plugged into the production oil pipe group, and a plug-in seal is arranged between the two; the intelligent control formation isolation valve (12) includes an isolation valve body (121) with an isolation valve central channel (122) formed in the middle, the pipe wall of the isolation valve body (121) forms an isolation valve liquid flow channel (124) and an isolation valve threading channel (125) opened along the axial direction, and a ball valve (123) is arranged at one end of the isolation valve central channel (122) close to the production oil pipe group, and the ball valve (123) is connected to the No. II cable 6, and is rotated by electric control or hydraulic control, thereby realizing the opening and closing of the isolation valve central channel (122).

8. A method for implementing the intelligent filling sand control process pipe column of the immovable pipe column according to any one of claims 1 to 7, characterized in that: The following steps are involved: a) Completion string running stage The immovable pipe string except the salvageable electric pump is lowered into the target layer as a whole; the large-diameter safety valve, the intelligent control reverse circulation switch valve, the intelligent control filling sleeve, the intelligent control formation isolation valve, and the production channel control valve are in the open state. After being lowered into place, the intelligent control formation isolation valve is closed, and the bypass diversion suspension packer is set; b) During the filling and sand control stage By adding sand inside the string and filling ultra-light particles, the sand-carrying fluid flows through the through-type circular liquid passage, enters the annulus between the wellbore and the sand control screen through the filling channel of the intelligent control filling sleeve, and the fluid filtered by the sand control screen flows through the production channel control valve into the toe production tubing, returns to the intelligent control formation isolation valve, returns to the intelligent control reverse circulation switch valve through the bypass liquid passage, and then enters the annulus between the immovable string intelligent filling sand control process string and the wellbore casing to circulate out of the well; c) Reverse circulation well washing stage Close the production channel control valve and the filling channel of the intelligent control filling sleeve, open the intelligent control formation isolation valve, and pump fluid from the wellhead to the annulus between the fixed pipe string intelligent filling sand control process pipe string and the wellbore casing. The fluid flows through the intelligent control reverse circulation switch valve and the bypass liquid passage into the toe production tubing, and then flows through the through-type circular liquid passage to circulate out of the well, cleaning the ultra-light particles above the intelligent control formation isolation valve; d) Production preparation stage Open the production channel control valve, close the liquid passage of the intelligent control reverse circulation switch valve and the large-diameter isolation sealing tool, put a salvageable electric pump into the upper production casing 1, and achieve sealing with the upper production casing through the isolation packer; e) Production stage The produced liquid from the formation enters the completion string through the sand screen, enters the toe production tubing through the production channel control valve, and is produced out of the well through the through-type circular liquid passage; f) Overhaul work Lift out the salvageable electric pump, unseal the large-diameter isolation sealing tool and the bypass diversion suspension packer, open the filling channel of the intelligent control filling sleeve and the liquid passage of the intelligent control reverse circulation switch valve, close the intelligent control formation isolation valve, and pump fluid from the wellhead into the annulus between the stationary pipe string and the wellbore casing through the intelligent control reverse circulation switch valve and the bypass liquid passage. The fluid flows through the intelligent control reverse circulation switch valve and the bypass liquid passage into the toe production oil pipe, and then enters the annulus between the sand control screen and the wellbore and flows upward, carrying ultra-light particles through the filling channel of the intelligent control filling sleeve and enters the through-type circular liquid passage to flow upward and circulate out of the well, clean the ultra-light particles filling the annulus between the sand control screen and the wellbore, and then lift out the completion pipe string.

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