Reverse filling and well cementation integrated pipe column and implementation method

Abstract

The invention relates to the technical field of oil field well cementation and well completion processes, in particular to a reverse filling and well cementation integrated tubular column and an implementation method.The reverse filling and well cementation integrated tubular column comprises an outer-layer tubular column body and an inner-layer tubular column body, and the outer-layer tubular column body comprises a reverse filling sliding sleeve, a screen pipe, a sealing cylinder, an open hole packer, a positioning coupling, a well cementation sliding sleeve and a sleeve which are sequentially and fixedly connected from bottom to top; the inner-layer pipe column comprises a reverse filling service tool, a washing pipe, a rotary positioning tool, a well cementation service tool, a bump pressure valve and a drill rod which are fixedly connected in sequence from bottom to top, the sealing cylinder is used for setting an open hole packer, the positioning coupling is used for positioning the well cementation service tool, the rotary positioning tool comprises a positioning position and a passing position, and the rotary positioning tool comprises a positioning hole and a passing hole. The bumping pressure valve is used for completing cementing bumping pressure and circulating cement washing work, one-time pipe column sand prevention and well cementation operation is achieved through cooperation of different positions of the inner pipe column and the outer pipe column, the operation time and cost are effectively saved, sand prevention is conducted firstly, then well cementation is conducted, and cement is effectively prevented from polluting a reservoir stratum.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield cementing and completion technology, and in particular to a reverse filling and cementing integrated pipe column and an implementation method. Background Art

[0002] For the second well opening in onshore oil fields, there are two commonly used cementing and sand control integrated technologies. One is the drilling-free plug screen top cementing sand control completion process. This process is to put the screen into the open hole, fill the top with sliding sleeves, and use the drilling-free plug to cement the well section above the oil layer. After the cementing is completed, the drilling-free plug is removed, and the filling service tool is put in to prevent sand in the oil layer section; the other is the drilling plug screen top cementing sand control process. This process is also to put the screen into the open hole, fill the top with sliding sleeves, and cement the well section above the oil layer. After the cementing is completed, the drilling plug, well-passing, and scraping pipe are required. After completion, the filling service tool is put in to prevent sand in the oil layer section. This process operation cannot be completed while drilling, the operation time is long, and the operation cost is relatively high.

[0003] Therefore, there is an urgent need for a structure that can complete sand control and cementing work in one trip of the tubing string to effectively save operation time and cost. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a reverse packing and cementing integrated pipe string and implementation method to solve the problems raised in the above background technology.

[0005] Based on the above purpose, the present invention provides a reverse filling cementing integrated pipe string, including an outer pipe string and an inner pipe string, wherein the outer pipe string includes a reverse filling sliding sleeve, a screen pipe, a sealing cylinder, an open hole packer, a positioning coupling, a cementing sliding sleeve and a casing which are fixedly connected in sequence from bottom to top; The inner layer pipe string includes a reverse filling service tool, a flushing pipe, a rotation positioning tool, a cementing service tool, a bump pressure valve and a drill pipe which are fixedly connected in sequence from bottom to top; The sealing cylinder is used to seal the open hole packer, the positioning collar is used to position the cementing service tool, the rotary positioning tool includes two positions: positioning and passing, and the impact pressure valve is used to complete the cement injection impact pressure and circulating cement washing work; Among them, sand control and cementing operations of the tubing are achieved in one trip through the coordination of different positions of the inner and outer tubing strings.

[0006] Preferably, the reverse filling sliding sleeve is provided with a protective sleeve to prevent naked eye erosion.

[0007] Preferably, the cementing sliding sleeve is provided with a cement anti-return protective sleeve.

[0008] Preferably, the reverse filling service tool comprises a guide shoe, a sleeve opening tool, a first short section, a sleeve closing tool and a filling sealing rod which are fixedly connected in sequence from bottom to top.

[0009] Preferably, the cementing service tool comprises a cementing sleeve opening tool, a second short section, a cementing sleeve closing tool and a cementing sealing rod with a fluid conversion device, which are fixedly connected in sequence from bottom to top.

[0010] Preferably, the liquid flow conversion device is provided with a cement injection hole, and the liquid flow conversion device opens the cement injection hole and closes the channel connection with the reverse filling service tool by pressing the ball.

[0011] A method for implementing a reverse filling and cementing integrated pipe string comprises the following steps: S1: Run the outer string, and then run the reverse packing sleeve, screen, sealing tube, open hole packer, positioning collar, cementing sleeve and casing in sequence; S2: Run the inner string, and then run the reverse filling service tool, flushing pipe, rotary positioning tool, cementing service tool, impact pressure valve and drill pipe into the outer string in sequence; S3: The cementing service tool is sealed and lowered to the sealing tube under the open hole packer. The annulus is pressurized to seal the open hole packer. The liquid enters the sealing hole of the open hole packer from the annulus of the inner and outer tubing strings. S4: Lower the inner string and open the reverse filling sleeve, and continue to lower it to the position. After the circulation test is normal, start the reverse circulation filling. The slurry flows through the drill pipe, the impact pressure valve, the cementing service tool, the rotary positioning tool, the flushing pipe, the reverse filling service tool, the reverse filling sleeve, the screen and the open hole annulus in sequence. The liquid returns to the ground through the outer string and the inner string annulus to complete the sand control work; S5: Lift the inner pipe string, drop a ball to pressurize, and open the cementing hole of the flow conversion device in the cementing service tool; S6: Continue to lower the inner string, open the cementing sleeve, rotate the positioning tool to position it at the positioning collar, pressurize and activate the cementing sleeve anti-return sleeve. After the circulation is normal, inject cement to cement the well. The cement slurry flows through the drill pipe, the impact pressure valve, the cementing service tool, the cementing sleeve, the casing and the open hole annulus in sequence until it is displaced to the designed position to complete the cementing work; S7: The glue plug pushes cement until the bump pressure valve hits the pressure, and continues to pressurize to activate the bump pressure valve to establish a positive circulation channel; S8: Lift the tubing string to the circulation position and clean the cement in positive circulation. The cleaning fluid flows through the drill pipe, impact pressure valve, cementing service tool, cement injection hole, inner tubing string and outer tubing string annulus in sequence until it is cleaned and then the drill is pulled out to complete the positive circulation cleaning of cement.

[0012] Preferably, the sand control work in S4 further includes lifting the inner layer pipe string to the reverse circulation well washing position, and performing large-volume reverse circulation well washing to wash out excess gravel.

[0013] Beneficial effects of the present invention: Through the coordination of different positions of the inner and outer pipe strings, sand control and cementing operations can be achieved in one trip, saving operation time and cost. The open hole packer achieves effective isolation of the lower oil layer section and the upper cementing section; Sand control before cementing can effectively prevent cement slurry from contaminating the oil layer; Use different service tools for sand control and cementing to avoid mutual interference; The uniquely designed cementing service tool fluid conversion device opens the cementing hole and closes the channel connection with the reverse filling service tool by throwing a ball to pressurize it; The cementing sleeve is designed with a cement anti-return protective sleeve, and the reverse filling sleeve is designed with an anti-open hole erosion protective sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a schematic diagram of the structure of the inner pipe column according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the outer pipe column according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of a pipe string when setting an open hole packer according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the pipe column structure during reverse filling according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the pipe string structure during reverse circulation well washing according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the pipe string structure when opening the cementing hole for cementing according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the pipe column structure during collision and pressure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the pipe column structure during positive circulation of cement slurry washing according to an embodiment of the present invention; Fig. 9 This is a schematic diagram of the structure of a cementing service tool according to an embodiment of the present invention; Fig.10 This is a schematic diagram of the structure of a reverse filling service tool according to an embodiment of the present invention; Fig.11 This is a schematic diagram of the structure of the protective cover against naked eye erosion according to an embodiment of the present invention; Fig.12 This is a schematic diagram of the structure of a cement anti-return protective sleeve according to an embodiment of the present invention; Fig.13 This is a schematic diagram of the structure of a liquid flow conversion device according to an embodiment of the present invention; Fig.14 This is a schematic diagram of the structure of a rotation positioning tool according to an embodiment of the present invention; Fig.15 It is a schematic diagram of the structure of the pressure relief valve according to an embodiment of the present invention.

[0016] The markings in the figure are: 1. Reverse filling sleeve; 1-1. Open hole erosion protection sleeve; 2. Screen; 3. Sealing tube; 4. Open hole packer; 5. Positioning coupling; 6. Cementing sleeve; 61. Cement anti-return protection sleeve; 7. Casing; 8. Reverse filling service tool; 81. Guide shoe; 82. Sleeve opening tool; 83. First short section; 84. Sleeve closing tool; 85. Filling sealing rod; 9. Flushing pipe; 10. Rotary positioning tool; 11. Cementing service tool; 111. Cementing sleeve opening tool; 112. Second short section; 113. Cementing sleeve closing tool; 114. Cementing sealing rod; 115. Liquid flow conversion device; 12. Impact pressure valve; 13. Drill pipe. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0018] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] like Figures 1 to 15 As shown, a reverse filling cementing integrated string comprises an outer string and an inner string, wherein the outer string comprises a reverse filling sleeve 1, a screen 2, a sealing tube 3, an open hole packer 4, a positioning coupling 5, a cementing sleeve 6 and a casing 7 which are fixedly connected in sequence from bottom to top; The inner pipe string includes a reverse filling service tool 8, a flushing pipe 9, a rotation positioning tool 10, a cementing service tool 11, a bump pressure valve 12 and a drill pipe 13 which are fixedly connected in sequence from bottom to top; The sealing cylinder 3 is used to seal the open hole packer 4, the positioning collar 5 is used to position the cementing service tool 11, the rotary positioning tool 10 includes two positions: positioning and passing, and the impact pressure valve 12 is used to complete the cement injection impact pressure and circulating cement washing work; Among them, sand control and cementing operations of the tubing are achieved in one trip through the coordination of different positions of the inner and outer tubing strings.

[0020] As an optional embodiment, the reverse filling sleeve 1 is provided with an anti-naked hole erosion protective sleeve 1-1.

[0021] As an optional embodiment, the cementing sleeve 6 is provided with a cement anti-return protective sleeve 61 .

[0022] As an optional embodiment, the reverse filling service tool 8 includes a guide shoe 81, a sleeve opening tool 82, a first short section 83, a sleeve closing tool 84 and a filling sealing rod 85 which are fixedly connected in sequence from bottom to top.

[0023] As an optional embodiment, the cementing service tool 11 includes a cementing sleeve 6 opening tool, a second short section 112, a cementing sleeve 6 closing tool and a cementing sealing rod 114 with a fluid conversion device 115 which are fixedly connected in sequence from bottom to top.

[0024] As an optional embodiment, a cement injection hole is provided on the liquid flow conversion device 115, and the liquid flow conversion device 115 opens the cement injection hole and closes the channel connection with the reverse filling service tool 8 by pressing with a ball.

[0025] A method for implementing a reverse filling and cementing integrated pipe string comprises the following steps: S1: Run the outer string, and then run the reverse packing sleeve 1, screen 2, sealing tube 3, open hole packer 4, positioning collar 5, cementing sleeve 6 and casing 7 in sequence; S2: The inner tubing string is lowered, and the reverse filling service tool 8, the flushing pipe 9, the rotation positioning tool 10, the cementing service tool 11, the impact pressure valve 12 and the drill pipe 13 are lowered into the outer tubing string in sequence; S3: The cementing service tool 11 is sealed and lowered to the sealing tube 3 below the open hole packer 4, and the annulus is pressurized to seal the open hole packer 4. The liquid enters the sealing hole of the open hole packer 4 from the annulus of the inner and outer tubing strings; S4: Lower the inner string and open the reverse filling sleeve 1, continue to lower it to the position, and after the circulation test is normal, start the reverse circulation filling. The slurry flows through the drill pipe 13, the impact pressure valve 12, the cementing service tool 11, the rotary positioning tool 10, the flushing pipe 9, the reverse filling service tool 8, the reverse filling sleeve 1, the screen 2 and the open hole annulus in sequence. The liquid returns to the ground through the outer string and the inner string annulus to complete the sand control work; S5: lifting the inner layer pipe string, throwing a ball to pressurize, and opening the cementing hole of the liquid flow conversion device 115 in the cementing service tool 11; S6: Continue to lower the inner pipe string, open the cementing sleeve 6, rotate the positioning tool 10 to position it at the positioning collar 5, pressurize and activate the cementing sleeve 6 to prevent the sleeve from returning. After the circulation is normal, inject cement to cement the well. The cement slurry flows through the drill pipe 13, the impact pressure valve 12, the cementing service tool 11, the cementing sleeve 6, the casing 7 and the open hole annulus in sequence until it is displaced to the designed position to complete the cementing work. S7: The glue plug pushes cement until the bump pressure valve 12 bumps and presses, and continues to pressurize to activate the bump pressure valve 12 to establish a positive circulation channel; S8: Lift the tubing string to the circulation position, and clean the cement in positive circulation. The cleaning fluid flows through the drill pipe 13, the impact pressure valve 12, the cementing service tool 11, the cement injection hole, the inner tubing string and the outer tubing string annulus in sequence until the drill is pulled out after cleaning to complete the positive circulation cleaning of the cement.

[0026] As an optional embodiment, the sand control work in S4 also includes lifting the inner layer pipe string to the reverse circulation well washing position, and performing large-volume reverse circulation well washing to wash out excess gravel.

[0027] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A reverse packing and cementing integrated tubular string, comprising an outer tubular string and an inner tubular string, characterized in that: The outer pipe string comprises a reverse filling sleeve (1), a screen tube (2), a sealing tube (3), an open hole packer (4), a positioning collar (5), a cementing sleeve (6) and a casing (7) which are fixedly connected in sequence from bottom to top; The inner layer pipe string comprises a reverse filling service tool (8), a flushing pipe (9), a rotation positioning tool (10), a cementing service tool (11), a pressure valve (12) and a drill pipe (13) which are fixedly connected in sequence from bottom to top; The sealing cylinder (3) is used to seal the open hole packer (4), the positioning collar (5) is used to position the cementing service tool (11), the rotary positioning tool (10) includes two positions: positioning and passing, and the impact pressure valve (12) is used to complete cement injection impact pressure and circulated cement washing work; Among them, sand control and cementing operations of the tubing are achieved in one trip through the coordination of different positions of the inner and outer tubing strings.

2. The reverse packing and cementing integrated pipe string according to claim 1, characterized in that: The reverse filling sliding sleeve (1) is provided with a naked eye erosion prevention protective sleeve (1-1).

3. The reverse packing and cementing integrated pipe string according to claim 1, characterized in that: The cementing sliding sleeve (6) is provided with a cement anti-return protective sleeve (61).

4. The reverse packing and cementing integrated pipe string according to claim 1, characterized in that: The reverse filling service tool (8) comprises a guide shoe (81), a sleeve opening tool (82), a first short section (83), a sleeve closing tool (84) and a filling sealing rod (85) which are fixedly connected in sequence from bottom to top.

5. The reverse packing and cementing integrated pipe string according to claim 1, characterized in that: The cementing service tool (11) comprises a cementing sleeve (6) opening tool, a second short section (112), a cementing sleeve (6) closing tool and a cementing sealing rod (114) with a fluid conversion device (115) which are fixedly connected in sequence from bottom to top.

6. The reverse packing and cementing integrated pipe string according to claim 5, characterized in that: The liquid flow conversion device (115) is provided with a cement injection hole, and the liquid flow conversion device (115) is pressed by a ball to open the cement injection hole and close the channel connection with the reverse filling service tool (8).

7. A method for implementing a reverse packing and cementing integrated pipe string according to any one of claims 1 to 6, characterized in that: The steps include: S1: lowering the outer tubing string, and successively lowering the reverse packing sleeve (1), the screen (2), the sealing tube (3), the open hole packer (4), the positioning coupling (5), the cementing sleeve (6) and the casing (7); S2: The inner tubing string is lowered, and the reverse filling service tool (8), the flushing pipe (9), the rotation positioning tool (10), the cementing service tool (11), the impact pressure valve (12) and the drill pipe (13) are successively lowered into the outer tubing string; S3: The cementing service tool (11) is sealed and lowered to the sealing tube (3) below the open hole packer (4), and the annulus is pressurized to seal the open hole packer (4), and the liquid enters the sealing hole of the open hole packer (4) from the annulus of the inner and outer tubing strings; S4: lowering the inner string and opening the reverse filling sleeve (1), and continuing to lower it to the position. After the circulation test is normal, reverse circulation filling is started, and the slurry flows through the drill pipe (13), the impact pressure valve (12), the cementing service tool (11), the rotary positioning tool (10), the flushing pipe (9), the reverse filling service tool (8), the reverse filling sleeve (1), the screen (2) and the open hole annulus in sequence. The liquid returns to the ground through the outer string and the inner string annulus to complete the sand control work; S5: lifting the inner layer pipe string, dropping a ball to pressurize, and opening the cement injection hole of the liquid flow conversion device (115) in the cementing service tool (11); S6: Continue to lower the inner pipe string, open the cementing sleeve (6), rotate the positioning tool (10) to position it on the positioning collar (5), pressurize and activate the cementing sleeve (6) to prevent the sleeve from returning. After the circulation is normal, inject cement to cement the well. The cement slurry flows through the drill pipe (13), the impact pressure valve (12), the cementing service tool (11), the cementing sleeve (6), the casing (7) and the open hole annulus in sequence until it is displaced to the designed position to complete the cementing work. S7: the cement injection plug pushes the cement to the impact pressure valve (12) to impact and press, and the impact pressure valve (12) is activated by continuous pressure injection to establish a positive circulation channel; S8: The tubing is lifted to the circulation position, and the cement is cleaned by positive circulation. The cleaning fluid flows through the drill pipe (13), the impact pressure valve (12), the cementing service tool (11), the cement injection hole, the inner tubing and the outer tubing annulus in sequence until the drill is pulled out after cleaning, thereby completing the positive circulation cleaning of the cement.

8. The method for implementing a reverse packing and cementing integrated pipe string according to claim 7, characterized in that: The sand control work in S4 also includes lifting the inner layer pipe string to the reverse circulation well washing position, and washing the well with large-volume reverse circulation to wash out excess gravel.

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