Alkaline earth metal salt

Abstract

The application discloses a kind of injection well full wellbore test process pipe column, including wellbore body and tubing string, both sides of the top of tubing string are fixedly connected with threaded rod, the outside of threaded rod is all threadedly connected with fixed sleeve, the end of fixed sleeve away from tubing string is all in contact with the inner wall of wellbore body, the inner wall of wellbore body is equidistantly fixedly connected with vertical plate, two limit slots are all set in the top of vertical plate, the application is compact in structure, simple and convenient to operate, and practical, by setting fixing mechanism, optical cable can be quickly fixed on the inner wall of injection well full wellbore test process pipe column, and cooperating with positioning mechanism, the up and down position of each fixing node can be freely changed, so that the operator avoids using a lot of rolling or clip to fix, greatly reduces the operation difficulty, and facilitates the quick disassembly and replacement in later period, improves the operation efficiency, and is favorable to actual use.

Description

Technical Field

[0001] This invention belongs to the technical field of injection well equipment, specifically relating to a test string for the entire wellbore of injection wells. Background Technology

[0002] As oilfield development progresses and enters the high water-cut development phase, the interlayer water absorption profile changes, necessitating in-wellbore testing to understand the water absorption status of smaller layers and adjust injection and production parameters based on the conditions between injection and production. Initially, testing primarily involved deploying instruments inside the wellbore to measure pressure and water absorption in perforated sections. Due to cost and process complexity, full-wellbore testing of injection wells was almost nonexistent. Technological innovation is the driving force, and advancements in fiber optic technology have brought hope to the industry. Utilizing fiber optic cables to perform full-wellbore testing of injection wells is a significant breakthrough. Fiber optic technology is a downhole distributed sensing technology that helps users conduct detailed, real-time observation of the entire injection wellbore. The technology works by directing light into a fiber optic line deployed along with the completion tubing. Changes in temperature, pressure, and acoustics within the well distort the optical path in the fiber, and the deformation is analyzed at the surface terminal to dynamically track downhole conditions.

[0003] However, in existing technologies, testing often uses external cable-carrying tools. During use, the cable is usually placed outside the tubing manually, and then the cable is positioned in the designated location using tape or clamps to prevent the cable from getting tangled or loose. Then it is gradually lowered into the wellbore. This operation method is cumbersome, and it is not easy to disassemble and replace it quickly later. In addition, it requires a lot of tape and clamps, which is not conducive to practical applications. Summary of the Invention

[0004] This invention provides a process string for testing the entire wellbore of a split injection well, which facilitates rapid disassembly and replacement in the later stages.

[0005] The technical solution adopted in this invention is a full-bore testing process string for injection wells, including a wellbore body. An oil tubing string is installed inside the wellbore body. A lifting sub is fixedly connected to one end of the oil tubing string away from the inner cavity of the wellbore body. At least one pair of threaded rods are radially fixed to the outer circumference of the oil tubing string. A fixing sleeve is threadedly connected to the end of each threaded rod away from the oil tubing string. The end of each fixing sleeve away from the oil tubing string abuts against the inner wall of the wellbore body. Several vertical plates are fixedly connected at equal intervals to the inner wall of the wellbore body. Two openings are provided at the end of each vertical plate away from the bottom of the inner cavity of the fixing sleeve. A limiting groove along the axial direction of the fixed sleeve, the limiting groove is a T-shaped groove, and a limiting plate is slidably connected inside the limiting groove. A limiting rod is fixedly connected to the side of the limiting plate away from the vertical plate. The end of the limiting rod away from the limiting plate extends to the outside of the vertical plate. A fixing plate is fixedly connected between each pair of limiting rods. A positioning mechanism is provided at the top and bottom of the fixing plate. A fixing mechanism is provided on the side of the fixing plate away from the limiting rod. A first hydraulic anchor and a tubing mechanism are sequentially arranged along the axial direction of the tubing string and at the bottom of the threaded rod.

[0006] The invention is further characterized in that,

[0007] The positioning mechanism includes positioning plates. Positioning plates are fixedly connected to both the top and bottom. Adjusting screws are threadedly connected to the inside of each positioning plate. Adjusting knobs are fixedly connected to the end of each adjusting screw away from the vertical plate. A pad is fixedly connected to the end of each adjusting screw away from the adjusting knob. The side of the pad away from the adjusting screw abuts against the outer surface of the corresponding vertical plate.

[0008] The pads are all made of rubber.

[0009] The fixing mechanism includes a fixing frame. The side of the fixing plate away from the vertical plate is fixedly connected to the fixing frame. The side of the fixing frame away from the fixing plate is a rotating rod. The movable end of the rotating rod is engaged with the fixing frame, and the fixed end of the rotating rod is pinned to the fixing frame. The side of the rotating rod close to the fixing plate is fixedly connected to a return spring. The end of the return spring away from the rotating rod is fixedly connected to the inner wall of the corresponding fixing frame.

[0010] The tubing string mechanism includes a first locking device, which is located circumferentially around the tubing string and at the bottom of a first hydraulic anchor. Along the axial direction of the tubing string and at the bottom of the first locking device, a first sealing isolator, a second hydraulic anchor, a sandblaster, a second locking device, a second sealing isolator, a third hydraulic anchor, and a plug are sequentially arranged.

[0011] A bottom switch is installed circumferentially around the oil pipe and at the bottom of the plug.

[0012] A tailpipe is installed at the end of the tubing string away from the lifting section.

[0013] The beneficial effects of this invention are:

[0014] This invention features a compact structure, simple and convenient operation, and strong practicality. By setting a fixing mechanism, the optical cable can be quickly fixed to the inner wall of the whole-wellbore testing process string in the injection well. At the same time, in conjunction with the positioning mechanism, the vertical position of each fixing node can be freely changed, and the position of the optical fiber can be measured. This avoids the need for operators to use a lot of tape or clips for fixing, greatly reducing the difficulty of operation. It also facilitates quick disassembly and replacement in the later stage, improves the efficiency of operation, and is beneficial to practical use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the tubing string for the whole wellbore testing process of the injection well of the present invention;

[0016] Figure 2 This is a top view of the wellbore body in the tubing string of the full wellbore testing process for injection wells according to the present invention;

[0017] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0018] Figure 4 This is a schematic diagram of the structure of the fixing plate in the tubing string of the whole wellbore testing process of the injection well of the present invention.

[0019] In the diagram, 1. Wellbore body, 2. Fixed sleeve, 3. Tubing string, 4. Lifting sub, 5. Vertical plate, 6. Limiting groove, 7. Limiting plate, 8. Limiting rod, 9. Fixed plate, 10. Positioning mechanism, 101. Positioning plate, 102. Adjusting screw, 103. Adjusting knob, 104. Pad, 11. Fixed mechanism, 111. Fixed frame, 112. Rotating rod, 113. Return spring, 12. First hydraulic anchor, 13. Tubing string mechanism, 131. First locking device, 132. First sealing isolator, 133. Second hydraulic anchor, 134. Sandblaster, 135. Second locking device, 136. Second sealing isolator, 137. Third hydraulic anchor, 138. Plug, 139. Bottom switch, 1310. Tailpipe, 14. Threaded rod. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] like Figure 1 and Figure 2As shown, the present invention discloses a full-bore testing process string for injection wells, comprising a wellbore body 1, an inner cavity of which is provided with a tubing string 3. A lifting section 4 is fixedly connected to one end of the tubing string 3 away from the inner cavity of the wellbore body 1, facilitating better lifting and lowering operations. At least one pair of threaded rods 14 are radially fixed to the outer circumference of the tubing string 3. A fixing sleeve 2 is threadedly connected to the end of each threaded rod 14 away from the tubing string 3. The end of the fixing sleeve 2 away from the tubing string 3 abuts against the inner wall of the wellbore body 1. By rotating the fixing sleeve 2, the... The fixed sleeve 2 is positioned outside the threaded rod 14, allowing the tubing string 3 to be better pressed against the inside of the wellbore body 1. Several vertical plates 5 are fixedly connected at equal intervals to the inner wall of the wellbore body 1. Each vertical plate 5 has two axially oriented limiting grooves 6 at its end away from the bottom of the fixed sleeve 2. The limiting grooves 6 are T-shaped, and each limiting groove 6 has a slidably connected limiting plate 7. A limiting rod 8 is fixedly connected to the side of the limiting plate 7 away from the vertical plate 5. The end of the limiting rod 8 away from the limiting plate 7... All extend to the outer side of the vertical plate 5, and a fixing plate 9 is fixedly connected between each of the two limiting rods 8. The T-shaped limiting groove 6 facilitates better cooperation with the limiting plate 7 and the limiting rod 8, thus facilitating better repositioning of the fixing plate 9. The limiting plate 7 and the limiting rod 8 facilitate better installation and fixation of the fixing plate 9. Multiple fixing plates 9 can be provided for multi-directional positioning of long optical cables. Positioning mechanisms 10 are provided at the top and bottom of the fixing plate 9. 9. A fixing mechanism 11 is provided on the side away from the limiting rod 8. A first hydraulic anchor 12 and a tubing mechanism 13 are arranged sequentially along the circumference of the tubing string 3 and at the bottom of the threaded rod 14. The anchor claws evenly distributed on the circumferential surface of the body of the first hydraulic anchor 12 are in their original state due to the action of the internal elastic element, that is, the anchor claw teeth are not higher than the body of the first hydraulic anchor 12. It is used for anchoring the tubing string for downhole operations such as hydraulic fracturing of oil wells or gas wells, water well injection enhancement, hydraulic sandblasting, cutting or sandblasting perforation, etc., to avoid axial displacement of downhole tools.

[0023] Example 2

[0024] like Figure 3 and Figure 4As shown, the positioning mechanism 10 of the present invention includes a positioning plate 101. The top and bottom of the fixing plate 9 are both fixedly connected to the positioning plate 101. The interior of the positioning plate 101 is threaded with an adjusting screw 102. The end of the adjusting screw 102 away from the vertical plate 5 is fixedly connected to an adjusting knob 103. The end of the adjusting screw 102 away from the adjusting knob 103 is fixedly connected to a pad 104. The side of the pad 104 away from the adjusting screw 102 abuts against the outer surface of the corresponding vertical plate 5. The adjusting knob 103 drives the adjusting screw 102 to rotate, thereby driving the pad 104 to move. The pad 104 contacts the outer side of the vertical plate 5, thereby positioning the fixed plate 9. The pad 104 is made of rubber material, which facilitates better contact and pressing with the outer side of the vertical plate 5, thereby better positioning the fixed plate 9.

[0025] Example 3

[0026] like Figure 3 and Figure 4 As shown, the fixing mechanism 11 of the present invention includes a fixing frame 111. The fixing frame 111 is fixedly connected to the side of the fixing plate 9 away from the vertical plate 5. The side of the fixing frame 111 away from the fixing plate 9 is a rotating rod 112. The movable end of the rotating rod 112 is engaged with the fixing frame 111, and the fixed end of the rotating rod 112 is pin-connected to the fixing frame 111. The side of the rotating rod 112 close to the fixing plate 9 is fixedly connected with a return spring 113. The end of the return spring 113 away from the rotating rod 112 is fixedly connected to the inner wall of the corresponding fixing frame 111. By pressing the rotating rod 112 and simultaneously squeezing the return spring 113, it is easier to better send the optical cable into the interior of the fixing frame 111 for fixing, preventing the optical cable from shaking during use, which is beneficial to practical use.

[0027] Example 4

[0028] like Figure 1As shown, the tubing string mechanism 13 of the present invention includes a first locking device 131, which is located circumferentially on the tubing string 3 and at the bottom of the first hydraulic anchor 12. Along the axial direction of the tubing string 3 and at the bottom of the first locking device 131, a first sealing isolator 132, a second hydraulic anchor 133, a sandblaster 134, a second locking device 135, a second sealing isolator 136, a third hydraulic anchor 137, and a plug 138 are sequentially arranged. The sandblaster 134 facilitates better sandblasting operations; the first locking device 131 and the second locking device 135 facilitate better locking operations; the first sealing isolator 132 and the second sealing isolator 136 facilitate better sealing and isolation operations; and the plug 138 facilitates better plugging operations. Furthermore, the tubing string mechanism 13 facilitates better integration with external fiber optic equipment, enabling analysis of deformation at the ground terminal and dynamic tracking of downhole conditions. A bottom switch 139 is provided around the tubing string and at the bottom of the plug 138 to facilitate better control of the bottom of the equipment.

[0029] A tailpipe 1310 is provided at the end of the tubing string 3 away from the lifting section 4 to facilitate better connection to the bottom of the tubing string 3.

[0030] The working process of this invention is as follows: First, the lifting section 4 is connected to an external lifting device. The tubing string 3 is lowered into the wellbore body 1 using the external lifting device. By rotating the fixing sleeve 2, the position of the fixing sleeve 2 outside the threaded rod 14 is changed, thereby better securing the tubing string 3 against the inside of the wellbore body 1. Then, the optical fiber can be installed by placing the required optical cable into the wellbore body 1. The operator then presses the rotating rod 112 and simultaneously squeezes the return spring 113 to send the optical cable into the fixing frame 111 for fixation, preventing the optical cable from shaking during use and facilitating practical application. Finally, the adjusting knob 103 drives the adjusting screw 102 to rotate. This causes the pad 104 to move, and the pad 104 contacts the outer side of the vertical plate 5, thereby positioning the fixed plate 9 and changing its position to better match the installation and use of the optical cable. This avoids the need for operators to use a lot of tape for fixing, greatly reducing the difficulty of operation. It also facilitates quick disassembly and replacement later, improving operational efficiency and benefiting practical use. Then, it can be used through the tubing mechanism 13 and in conjunction with external fiber optic equipment to facilitate the analysis of deformation at the ground terminal and dynamically track the downhole condition. At the same time, operators can also monitor the temperature changes of the oil casing annular space and oil layer section in real time through distributed optical fiber, thereby effectively evaluating the water injection effect and water absorption profile.

[0031] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0032] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A full-wellbore testing process string for injection wells, characterized in that, The well includes a wellbore body (1), the inner cavity of which is provided with a tubing string (3). A lifting section (4) is fixedly connected to one end of the tubing string (3) away from the inner cavity of the wellbore body (1). At least one pair of threaded rods (14) are radially fixed to the outer circumference of the tubing string (3). A fixing sleeve (2) is threadedly connected to one end of each threaded rod (14) away from the tubing string (3). The end of each fixing sleeve (2) away from the tubing string (3) abuts against the inner wall of the wellbore body (1). Several vertical plates (5) are fixedly connected at equal intervals to the inner wall of the wellbore body (1). Two limiting grooves (6) are provided at the end of each vertical plate (5) away from the bottom of the inner cavity of the fixing sleeve (2), along the axial direction of the fixing sleeve (2). The slot (6) is a T-shaped slot. The slot (6) is slidably connected to a limiting plate (7). The limiting plate (7) is fixedly connected to a limiting rod (8) on the side away from the vertical plate (5). The end of the limiting rod (8) away from the limiting plate (7) extends to the outside of the vertical plate (5). A fixing plate (9) is fixedly connected between the two limiting rods (8). The top and bottom of the fixing plate (9) are provided with a positioning mechanism (10). The side of the fixing plate (9) away from the limiting rod (8) is provided with a fixing mechanism (11). The circumferential direction of the tubing string (3) and the bottom of the threaded rod (14) are sequentially provided with a first hydraulic anchor (12) and a tubing string mechanism (13) along the axial direction of the tubing string (3). The positioning mechanism (10) includes a positioning plate (101). The top and bottom of the fixing plate (9) are both fixedly connected to the positioning plate (101). The interior of the positioning plate (101) is threaded with an adjusting screw (102). The end of the adjusting screw (102) away from the vertical plate (5) is fixedly connected to an adjusting knob (103). The end of the adjusting screw (102) away from the adjusting knob (103) is fixedly connected to a pad (104). The side of the pad (104) away from the adjusting screw (102) abuts against the outer surface of the corresponding vertical plate (5). The fixing mechanism (11) includes a fixing frame (111). The fixing frame (111) is fixedly connected to the side of the fixing plate (9) away from the vertical plate (5). The side of the fixing frame (111) away from the fixing plate (9) is a rotating rod (112). The movable end of the rotating rod (112) is engaged with the fixing frame (111). The fixed end of the rotating rod (112) is pin-connected to the fixing frame (111). The side of the rotating rod (112) close to the fixing plate (9) is fixedly connected with a return spring (113). The end of the return spring (113) away from the rotating rod (112) is fixedly connected to the inner wall of the corresponding fixing frame (111).

2. The whole-wellbore testing process string for injection wells according to claim 1, characterized in that, The pads (104) are all made of rubber.

3. The whole-wellbore testing process string for injection wells according to claim 1, characterized in that, The tubing string mechanism (13) includes a first locking device (131), which is located circumferentially on the tubing string (3) and at the bottom of a first hydraulic anchor (12). Along the axial direction of the tubing string (3) and at the bottom of the first locking device (131), a first sealing isolator (132), a second hydraulic anchor (133), a sandblaster (134), a second locking device (135), a second sealing isolator (136), a third hydraulic anchor (137), and a plug (138) are arranged sequentially.

4. The whole-wellbore testing process string for injection wells according to claim 3, characterized in that, The tubing string (3) is provided with a bottom switch (139) circumferentially and located at the bottom of the plug (138).

5. The whole-wellbore testing process string for injection wells according to claim 3, characterized in that, The oil pipe string (3) is provided with a tailpipe (1310) at the end away from the lifting section (4).

Images