An integrated tubing string for testing and completing a well

Abstract

The utility model discloses an oil testing and well completion integrated pipe column, including first pipe column and second pipe column, first pipe column and second pipe column pass through flange fixed connection, the inner wall of first pipe column is fixed with the clamping oil pipe, the bottom of clamping oil pipe is connected with the downhole safety valve through the flange, the bottom of downhole safety valve is fixed with the fixed cylinder, the sidewall top of fixed cylinder is fixedly connected with the inner wall of first pipe column, and the inner wall and the outer wall of fixed cylinder all are fixed with a plurality of uniform distribution's sliding block, the inner wall sliding fit of first pipe column has the sliding cylinder, the sliding cylinder is located the bottom of fixed cylinder, and its sidewall inside is equipped with the sliding slot, the sliding block surface of fixed cylinder and the inner wall sliding connection of sliding slot of sliding cylinder. Through the fixed cylinder and the sliding cylinder of downhole safety valve bottom part setting, through the sliding block and the sliding slot sliding connection, the telescopic amount that the pipe column produced because of temperature pressure change is effectively compensated in the downhole.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil well completion tubing, specifically relating to an integrated tubing string for oil testing and completion. Background Technology

[0002] Integrated well testing and completion tubing was developed to address the problems of traditional segmented well testing and completion operations, which are cumbersome, time-consuming, costly, and pose a significant risk of reservoir damage. In conventional and unconventional oil and gas reservoirs and complex well conditions, multiple tubing runs not only increase operational risks but also negatively impact production capacity. This technology integrates multiple functions, including well testing, production, and even sand control, into a single tubing run. It aims to significantly reduce operational steps, lower costs, protect the reservoir, and achieve rapid, safe, and efficient extraction, making it particularly suitable for modern oil and gas field development scenarios with increasingly stringent requirements for operational efficiency and reservoir protection.

[0003] A search revealed a Chinese patent publication number CN203939477U, which discloses an integrated tubing string for well testing and completion operations. The tubing is connected to a tubing hanger, with one end of the tubing connected to a downhole safety valve. The other end of the downhole safety valve is connected to the tubing, and the other end of the tubing is connected to a sealing plug. The sealing plug is locked to a permanent packer via ratchet teeth. The permanent packer is connected to the tubing, with the other end of the tubing connected to a POP-V valve. The other end of the POP-V valve is connected to a screen pipe, and the other end of the screen pipe is connected to a plug.

[0004] The aforementioned patent has the following shortcomings: the device achieves the effect of quickly going down to the predetermined setting position by connecting downhole safety valves, packers, POP-V valves, etc., shortening the operation cycle and reducing operation costs, but it does not have an effective expansion and contraction compensation structure when the tubing is subjected to bulging or helical bending effects.

[0005] To address this, an integrated well testing and completion tubing string is proposed, which can effectively compensate for tubing deformation and enable multiple operations to be completed in one tubing run. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the above-mentioned defects and provide an integrated tubing column that can effectively compensate for tubing deformation, enable multiple operations to be completed in one trip of tubing column, and achieve a reasonable structure and a high safety factor.

[0007] To address one or more of the above-mentioned defects or improvement needs in the existing technology, this utility model provides an integrated well testing and completion tubing string, including a first tubing string and a second tubing string. The first tubing string and the second tubing string are fixedly connected by a flange. A snap-fit ​​tubing is fixedly installed on the inner wall of the first tubing string. The bottom of the snap-fit ​​tubing is connected to a downhole safety valve via a flange. A fixed cylinder is fixedly connected to the bottom of the downhole safety valve. The top of the side wall of the fixed cylinder is fixedly connected to the inner wall of the first tubing string. Multiple evenly distributed sliders are fixedly installed on both the inner and outer walls of the fixed cylinder. A sliding cylinder is slidably fitted on the inner wall of the first tubing string. The sliding cylinder is located at the bottom of the fixed cylinder, and a groove is opened inside its side wall. The surface of the slider of the fixed cylinder is slidably connected to the inner wall of the groove of the sliding cylinder.

[0008] In some embodiments, a sealing rubber gasket is fixedly provided on the inner wall surface of the chute.

[0009] In some embodiments, a limit ring is fixedly provided on the inner wall of the second tubular column.

[0010] In some embodiments, a support plate is fixedly provided at the top of the first tubing string, and an oil pipe hanger is connected to the inner wall of the support plate.

[0011] In some embodiments, a snap-fit ​​block is fixedly provided at the bottom of the inner wall of the tubing hanger, and a snap-fit ​​groove is provided at the top of the snap-fit ​​tubing, the shape of which matches the snap-fit ​​block.

[0012] In some embodiments, the clamping block of the tubing hanger engages with the clamping groove of the tubing.

[0013] In some embodiments, an oil pipe is fixedly connected to the bottom of the sliding cylinder, and a circulation valve is fixedly connected to the bottom of the oil pipe via a flange.

[0014] In some embodiments, a packer is fixedly connected to the bottom of the circulation valve via a flange, a screen tube is fixedly connected to the bottom of the packer via a flange, and a pump-out blocking valve is fixedly connected to the bottom of the screen tube via a flange.

[0015] In summary, the technical solutions conceived by this invention have the following beneficial effects compared with the prior art: 1. This utility model discloses an integrated well testing and completion tubing string, which can be connected by a fixed cylinder and a sliding cylinder at the bottom of the downhole safety valve via a slider and a groove. This design effectively compensates for the expansion and contraction of the tubing string caused by piston effect and temperature effect due to temperature and pressure changes downhole. This design increases the safety factor of the tubing string from the original 1.3-1.5 to over 1.5, enabling the entire tubing string system to meet the safety tubing string standard and significantly improving reliability under high temperature, high pressure and complex operating conditions.

[0016] 2. This utility model discloses an integrated well testing and completion tubing string. The tubing hanger is fixed to the top of the first tubing string via a support plate, and the bottom of the tubing hanger is securely engaged with the tubing's groove via a snap-fit ​​block. The support plate provides primary support for the entire tubing string, transferring most of the weight to the wellhead. The engagement of the snap-fit ​​block and the groove forms a second layer of protection, enhancing the stability of the tubing string.

[0017] 3. The present invention provides an integrated well testing and completion tubing string. In this device, the circulation valve facilitates operations such as circulation kill, the packer is used to seal the producing formation, the screen pipe plays a role in sand prevention and filtration, and the pump-out plugging valve can provide a reliable bottom hole seal after well completion. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of an integrated well testing and completion tubing string according to an embodiment of this utility model; Figure 2 This is a side view of an integrated well testing and completion tubing string according to an embodiment of this utility model; Figure 3 This is a cross-sectional view of an integrated well testing and completion tubing string according to an embodiment of this utility model; Figure 4 This is a cross-sectional view of an integrated well testing and completion tubing string according to an embodiment of this utility model.

[0019] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1 first tubing string, 2 second tubing string, 3 tubing hanger, 4 clamped tubing, 5 downhole safety valve, 6 fixed cylinder, 7 sliding cylinder, 8 tubing, 9 limiting and fixing ring, 10 circulation valve, 11 packer, 12 screen pipe, 13 pump-out plugging valve, 14 sluice, 15 slider, 16 clamping block, 17 support plate, 18 clamping groove. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0021] Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] Please refer to Figure 1-4An integrated well testing and completion tubing string includes a first tubing string 1 and a second tubing string 2. The first tubing string 1 and the second tubing string 2 are fixedly connected by a flange. A snap-fit ​​tubing 4 is fixedly installed on the inner wall of the first tubing string 1. The bottom of the snap-fit ​​tubing 4 is connected to a downhole safety valve 5 via a flange. A fixed cylinder 6 is fixedly connected to the bottom of the downhole safety valve 5. The top of the side wall of the fixed cylinder 6 is fixedly connected to the inner wall of the first tubing string 1. Multiple evenly distributed sliders 15 are fixedly installed on both the inner and outer walls of the fixed cylinder 6. A sliding cylinder 7 is slidably fitted on the inner wall of the first tubing string 1. The sliding cylinder 7 is located at the bottom of the fixed cylinder 6, and a groove 14 is formed inside its side wall. The surface of the slider 15 of the fixed cylinder 6 is slidably connected to the inner wall of the groove 14 of the sliding cylinder 7. A sealing rubber gasket is fixedly installed on the inner wall surface of the groove 14. A limit fixing ring 9 is fixedly installed on the inner wall of the second tubing string 2.

[0023] This device uses a fixed cylinder 6 and a sliding cylinder 7 installed at the bottom of the downhole safety valve 5, which are slidably connected by a slider 15 and a groove 14. This design effectively compensates for the expansion and contraction of the tubing caused by piston effects and temperature effects due to temperature and pressure changes downhole. This design increases the safety factor of the tubing from the original 1.3-1.5 to over 1.5, enabling the entire tubing system to meet safety standards and significantly improving reliability under complex high-temperature and high-pressure conditions.

[0024] In this embodiment, a support plate 17 is fixedly installed on the top of the first tubing column 1. The inner wall of the support plate 17 is connected to the tubing hanger 3. A snap-fit ​​block 16 is fixedly installed on the bottom of the inner wall of the tubing hanger 3. A snap-fit ​​groove 18 is opened on the top of the snap-fit ​​tubing 4. The shape of the snap-fit ​​groove 18 matches the snap-fit ​​block 16, and the snap-fit ​​block 16 of the tubing hanger 3 and the snap-fit ​​groove 18 of the snap-fit ​​tubing 4 snap-fit ​​each other.

[0025] This device secures the tubing hanger 3 to the top of the first tubing string 1 via the support plate 17. The bottom of the tubing hanger 3 is then securely engaged with the slot 18 of the tubing 4 via the snap-fit ​​block 16. The support plate 17 provides primary support for the entire tubing string, transferring most of the weight to the wellhead. The engagement of the snap-fit ​​block 16 and the slot 18 forms a second layer of protection, enhancing the stability of the tubing string.

[0026] In this embodiment, an oil pipe 8 is fixedly connected to the bottom of the sliding cylinder 7, and a circulation valve 10 is fixedly connected to the bottom of the oil pipe 8 via a flange. A packer 11 is fixedly connected to the bottom of the circulation valve 10 via a flange, a screen pipe 12 is fixedly connected to the bottom of the packer 11 via a flange, and a pump-out blocking valve 13 is fixedly connected to the bottom of the screen pipe 12 via a flange.

[0027] In this device, the circulation valve 10 facilitates operations such as circulating well control, the packer 11 is used to seal the producing formation, the screen pipe 12 serves as a sand preventer and filter, and the pump-out plugging valve 13 can provide a reliable bottom hole seal after well completion.

[0028] In this example, an integrated well completion and testing string is used. The assembled first string 1 and second string 2 are simultaneously lowered into the well to the designed depth. The annulus is sealed using a positive pressure packer 11. After successful sealing, reverse circulation is initiated via the circulation valve 10 to replace the fluid in the wellbore. Positive pressure is applied to dislodge the pump-out plugging valve 13, establishing full-bore access within the string. Blowout, testing, or reservoir stimulation operations are then performed. Throughout the entire operation, the fixed sleeve 6 and sliding sleeve 7 continuously compensate for deformation caused by changes in operating conditions, ensuring the safety and stability of the string system.

[0029] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An integrated well testing and completion tubing string, characterized in that: The system includes a first tubing string (1) and a second tubing string (2). The first tubing string (1) and the second tubing string (2) are fixedly connected by a flange. A snap-fit ​​tubing (4) is fixedly installed on the inner wall of the first tubing string (1). A downhole safety valve (5) is connected to the bottom of the snap-fit ​​tubing (4) through a flange. A fixed cylinder (6) is fixedly connected to the bottom of the downhole safety valve (5). The top of the side wall of the fixed cylinder (6) is fixedly connected to the inner wall of the first tubing string (1). Multiple evenly distributed sliders (15) are fixedly installed on both the inner and outer walls of the fixed cylinder (6). A sliding cylinder (7) is slidably fitted on the inner wall of the first tubing string (1). The sliding cylinder (7) is located at the bottom of the fixed cylinder (6), and a sliding groove (14) is opened inside its side wall. The surface of the slider (15) of the fixed cylinder (6) is slidably connected to the inner wall of the sliding groove (14) of the sliding cylinder (7).

2. The integrated well testing and completion tubing string according to claim 1, characterized in that: A sealing rubber gasket is fixedly installed on the inner wall surface of the chute (14).

3. The integrated well testing and completion tubing string according to claim 1, characterized in that: The inner wall of the second tubular column (2) is fixedly provided with a limit fixing ring (9).

4. The integrated well testing and completion tubing string according to claim 1, characterized in that: A support plate (17) is fixedly installed on the top of the first tubing string (1), and an oil pipe hanger (3) is connected to the inner wall of the support plate (17).

5. The integrated well testing and completion tubing string according to claim 4, characterized in that: A snap-fit ​​block (16) is fixedly installed at the bottom of the inner wall of the oil pipe hanger (3), and a snap-fit ​​groove (18) is opened at the top of the snap-fit ​​oil pipe (4). The shape of the snap-fit ​​groove (18) matches the snap-fit ​​block (16).

6. The integrated well testing and completion tubing string according to claim 5, characterized in that: The snap-fit ​​block (16) of the oil pipe hanger (3) is snapped into the snap-fit ​​groove (18) of the snap-fit ​​oil pipe (4).

7. The integrated well testing and completion tubing string according to claim 1, characterized in that: The bottom of the sliding cylinder (7) is fixedly connected to an oil pipe (8), and the bottom of the oil pipe (8) is fixedly connected to a circulation valve (10) via a flange.

8. The integrated well testing and completion tubing string according to claim 7, characterized in that: The bottom of the circulation valve (10) is fixedly connected to a packer (11) via a flange, the bottom of the packer (11) is fixedly connected to a screen tube (12) via a flange, and the bottom of the screen tube (12) is fixedly connected to a pump-out blocking valve (13) via a flange.

Images