Horizontal well water exploration and water plugging integrated tubular column based on distributed optical fibers

Abstract

The utility model discloses a horizontal well water exploration and water plugging integrated tubular column based on distributed optical fibers, and belongs to the technical field of mining devices in horizontal wells. Comprising an oil pipe, a plurality of optical fibers are evenly distributed on the circumference of the outer wall of the oil pipe, the optical fibers extend into the horizontal well from the ground, an installation mechanism is arranged on the oil pipe and comprises U-shaped clamping grooves matched with the optical fibers in number, a plurality of evenly-distributed through holes are formed in the closed ends of the U-shaped clamping grooves, and the optical fibers are arranged in the U-shaped clamping grooves. A hoop mechanism is arranged on the outer side of the U-shaped clamping groove and presses the open end of the U-shaped clamping groove to the outer wall of the oil pipe. The technical scheme is used for solving the problem that in the prior art, when pipe lowering operation is carried out, an optical fiber on the outer wall of a pipeline is prone to colliding with a horizontal well wall to be damaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of mining devices in horizontal wells, and in particular relates to an integrated pipe column for water finding and blocking in horizontal wells based on distributed optical fibers. Background Art

[0002] With the continuous expansion of the demand for oil and gas exploration and development, oil and gas production has put forward higher requirements for well-controlled reserves and ultimate recovery rate. As an important technical means for the efficient development of oil and gas fields, horizontal wells, while improving the controlled reserves and recovery rate of single wells, also face the problems of rapid bottom water ridge advance and a sharp drop in oil production after water breakthrough. How to accurately and efficiently determine the water-producing position of horizontal wells, and carry out timely and effective plugging, and then control the water content of horizontal wells, is an urgent problem to be solved in the current research on horizontal well plugging and water control.

[0003] At present, the existing technology uses distributed optical fibers to find water in horizontal wells, such as a distributed optical fiber-based horizontal well water finding and blocking integrated tubing with patent number CN202121183339.1, including a casing lowered into the horizontal well, an oil pipe is sleeved in the casing, and an optical fiber is fixed to the outside of the oil pipe that extends into the horizontal well along with the oil pipe, and the optical fiber is connected to the ground integrated control system outside the horizontal well; the vertical section of the oil pipe is provided with a top packer fixed to the casing, and two expandable packers are arranged at intervals at the front end of the oil pipe extending through the perforation section, and a throttle valve is provided on the oil pipe between the expandable packers.

[0004] In the above-mentioned prior art, although the optical fiber is used in conjunction with the oil pipe to be lowered into the horizontal well, and the water layer level is detected by using the optical fiber and the ground integrated control system, in actual use, since the optical fiber is installed on the outer wall of the pipeline, when the pipe is lowered, the optical fiber is very likely to be damaged due to collision with the horizontal well wall (or pipe wall). Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide an integrated horizontal well water finding and blocking pipe column based on distributed optical fiber, so as to solve the problem in the prior art that the optical fiber on the outer wall of the pipeline is very easy to collide with the horizontal well wall and cause damage during the pipe lowering operation.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] The utility model discloses an integrated pipe column for water finding and plugging in a horizontal well based on distributed optical fiber, comprising an oil pipe, a plurality of optical fibers are evenly distributed on the circumference of the outer wall of the oil pipe, the optical fibers extend from the ground into the horizontal well, a mounting mechanism is provided on the oil pipe, the mounting mechanism comprises a U-shaped slot matching the number of optical fibers, a plurality of evenly distributed through holes are provided on the closed end of the U-shaped slot, the optical fibers are arranged inside the U-shaped slot, a clamp mechanism is provided on the outer side of the U-shaped slot, and the clamp mechanism presses the open end of the U-shaped slot against the outer wall of the oil pipe.

[0008] Furthermore, the clamp mechanism includes a first arc-shaped clamp block and a second arc-shaped clamp block, and the side walls at the open ends of the first arc-shaped clamp block and the second arc-shaped clamp block are provided with connecting blocks, and the connecting blocks are provided with locking bolts for locking the first arc-shaped clamp block and the second arc-shaped clamp block, and the inner walls of the first arc-shaped clamp block and the second arc-shaped clamp block are provided with grooves matching the U-shaped groove, and the U-shaped groove is arranged in the groove.

[0009] Furthermore, an anti-scratch layer is provided on the inner wall of the U-shaped slot.

[0010] Furthermore, the anti-scratch layer is a rubber layer, and the rubber layer is bonded to two inner side walls of the U-shaped slot.

[0011] Furthermore, it also includes two end packers arranged at one end of the oil pipe located deep in the horizontal well, a top packer arranged at the vertical part of the oil pipe located in the horizontal well, and a ground integrated control system arranged on the ground, an installation spacing is arranged between the two end packers, and a throttle valve is arranged on the oil pipe within the installation spacing.

[0012] Furthermore, an anti-slip layer is provided on the contact surface of the oil pipe at the opening end of the U-shaped groove.

[0013] Furthermore, the anti-slip layer is a rubber layer, and the rubber layer is riveted on the U-shaped slot.

[0014] Furthermore, the contact portion between the clamp mechanism and the oil pipe is serrated.

[0015] The beneficial effects of the utility model are:

[0016] 1) In the present invention, the installation mechanism and the clamp mechanism are arranged to stably install the optical fiber on the oil pipe, and the optical fiber is located inside the U-shaped slot, so it will not collide with the inner wall of the horizontal well, thus protecting the optical fiber;

[0017] 2) The utility model uses optical fiber and oil pipe to be lowered into the horizontal well, and uses optical fiber and ground integrated control system to detect the water-producing layer. After the water-producing layer is detected, the two end packers and the throttle valve can be dragged to the water-producing part by lifting the oil pipe to plug the leak. That is, the pipe string in this technical solution has the dual functions of finding water and plugging water.

[0018] Other advantages, objectives and features of the utility model will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:

[0020] Figure 1 It is a schematic diagram of the pipe string in the utility model being installed in a horizontal well;

[0021] Figure 2 It is a schematic diagram of the installation mechanism and the clamp mechanism in the utility model connected to the oil pipe;

[0022] Figure 3 It is a schematic diagram of the coordination of the installation mechanism and the clamp mechanism in the utility model;

[0023] Figure 4 It is a three-dimensional schematic diagram of the clamp mechanism in the utility model.

[0024] The following are marked in the accompanying drawings:

[0025] Horizontal well 1, oil pipe 2, plug 3, end packer 4, throttle valve 5, top packer 6, ground integrated control system 7, installation mechanism 8, U-shaped slot 81, through hole 82, clamp mechanism 9, first arc-shaped clamp block 91, second arc-shaped clamp block 92, connecting block 93, locking bolt 94, groove 95, leakage segment 10. DETAILED DESCRIPTION

[0026] like Figures 1 to 4As shown, the utility model is an integrated water finding and blocking pipe column for horizontal wells based on distributed optical fibers, including an oil pipe 2, and a plurality of optical fibers are evenly distributed on the circumference of the outer wall of the oil pipe 2. The number of optical fibers is determined according to the diameter of the oil pipe 2. In the present technical scheme, the number of optical fibers is 4, and the pipeline is installed in such a way that the optical fibers are extended from the ground into the horizontal well 1. An installation mechanism 8 is provided on the oil pipe 2, and the installation mechanism 8 includes a U-shaped groove 81 matching the number of optical fibers. A plurality of evenly distributed through holes 82 are provided on the closed end of the U-shaped groove 81. The optical fiber is arranged inside the U-shaped groove 81, and a clamp mechanism 9 is provided on the outer side of the U-shaped groove 81. The clamp mechanism 9 presses the open end of the U-shaped groove 81 against the outer wall of the oil pipe 2.

[0027] The installation principle of the present technical solution is: the optical fiber is placed inside the U-shaped groove 81, the closed end of the U-shaped groove 81 is in contact with the oil pipe 2, and at the same time, under the action of the clamp mechanism 9, the U-shaped groove 81 is fixed to the oil pipe 2. This fixing method covers the optical fiber through the U-shaped groove 81, thereby avoiding the optical fiber from colliding with the inner wall of the horizontal well 1 or the casing wall arranged in the horizontal well 1, and avoiding damage to the optical fiber during the lowering process. At the same time, a plurality of through holes 82 are provided on the U-shaped groove 81, and water or a water mixture can enter the U-shaped groove 81, thereby ensuring the connection between the optical fiber and the space inside the horizontal well 1, and then the temperature and pressure data in the horizontal well 1 can be detected through the optical fiber, and then the water outlet position in the horizontal well 1 can be confirmed. The specific principle of how the optical fiber finds water can refer to the application of the optical fiber pipe column in water finding and water blocking in the prior art, and no excessive elaboration will be made here.

[0028] like Figure 4 As shown, in an operative manner, the clamp mechanism 9 includes a first arc-shaped clamp block 91 and a second arc-shaped clamp block 92, and a connecting block 93 is provided on the side walls at the open ends of the first arc-shaped clamp block 91 and the second arc-shaped clamp block 92, and a locking bolt 94 is provided on the connecting block 93 for locking the first arc-shaped clamp block 91 and the second arc-shaped clamp block 92, and a groove 95 matching the U-shaped clamp groove 81 is provided on the inner wall of the first arc-shaped clamp block 91 and the second arc-shaped clamp block 92, and the U-shaped clamp groove 81 is arranged in the groove 95.

[0029] The U-shaped slot 81 is clamped by the grooves 95 on the first arc-shaped clamping block 91 and the second arc-shaped clamping block 92 to limit the position of the U-shaped slot 81. At the same time, the clamping mechanism 9 is fixed and locked on the oil pipe 2 through the action of the locking bolt 94, thereby achieving the fixation and limitation of the U-shaped slot 81 and the limitation of the position of the optical fiber. This setting method makes the connection method between the oil pipe 2 simple and can also achieve a better effect of limiting and fixing the U-shaped slot 81.

[0030] In one practicable manner, an anti-scratch layer is provided on the inner wall of the U-shaped slot 81. The anti-scratch layer is provided to prevent the optical fiber from contacting the inside of the U-shaped slot 81 and causing friction damage. It is not difficult to understand that the U-shaped slot 81 is preferably rigid, and its width should be adapted to the width of the optical fiber. The specific anti-scratch layer is a rubber layer, which is bonded to the two inner side walls of the U-shaped slot 81.

[0031] like Figure 1 As shown, in an practicable manner, it also includes two end packers 4 arranged at one end of the oil pipe 2 located deep in the horizontal well 1, a top packer 6 arranged at the vertical part of the oil pipe 2 located in the horizontal well 1, and a ground integrated control system 7 arranged on the ground, an installation spacing is arranged between the two end packers 4, and a throttle valve 5 is arranged on the oil pipe 2 within the installation spacing.

[0032] When the utility model is operated, the oil pipe 2 is lowered into the horizontal well 1, and the water plugging tool string consisting of two end packers 4 (expansion packers) and a throttle valve 5 is lowered to the toe of the horizontal well 1, passing over each leakage section 10. Laser pulses are emitted through optical fibers, and reflected waves of downhole events are received, downhole temperature and pressure data are collected and transmitted back to the ground integrated control system 7 for data quality monitoring and control. After data decoding and visualization processing, the water outlet position is determined, and the water search operation is completed.

[0033] After determining the water outlet location, lift the tubing 2, and drag the two expansion packers and the throttle valve 5 to the leaking segment 10 where water is coming out. Inject a water plugging agent into the tubing 2 from the ground, so that the pressure inside the tubing 2 is greater than the pressure outside to form a pressure difference. Under the action of pressure, the throttle valve 5 is opened, and the two expansion packers expand due to the pressure to seal the casing, blocking the two sides of the leaking segment 10, so that the water plugging agent can smoothly enter the leaking segment 10 where water is coming out. After the water plugging agent is injected, the pressure difference between the inside and outside of the tubing 2 disappears, and the two expansion packers are released from the expansion state. Then lift the tubing 2 to complete the operation. Of course, it is not difficult to understand that a plug 3 should be set at the end of the tubing 2 to avoid air pressure leakage. The plug 3 can be an automatic valve.

[0034] In an practicable manner, an anti-skid layer is provided on the contact surface of the oil pipe 2 at the open end of the U-shaped slot 81 , and the anti-skid layer is a rubber layer, and the rubber layer is riveted to the U-shaped slot 81 .

[0035] In one feasible manner, the contact portion between the clamp mechanism 9 and the oil pipe 2 is serrated. The serrated design can better lock the clamp mechanism 9 on the oil pipe 2, thereby preventing the clamp mechanism 9 from rotating on the oil pipe 2 and causing damage to the optical fiber.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A distributed optical fiber-based horizontal well water-finding and water-blocking integrated pipe string, comprising an oil pipe, a plurality of optical fibers are evenly distributed on the outer wall of the oil pipe, and the optical fibers extend from the ground to the horizontal well, characterized in that: The oil pipe is provided with a mounting mechanism, which includes a U-shaped slot matching the number of optical fibers, a closed end of the U-shaped slot is provided with a plurality of evenly distributed through holes, the optical fibers are arranged inside the U-shaped slot, and a clamp mechanism is provided outside the U-shaped slot, and the clamp mechanism presses the open end of the U-shaped slot against the outer wall of the oil pipe.

2. The integrated water finding and plugging string for horizontal wells based on distributed optical fiber according to claim 1, characterized in that: The clamp mechanism includes a first arc-shaped clamp block and a second arc-shaped clamp block, and connecting blocks are provided on the side walls at the open ends of the first arc-shaped clamp block and the second arc-shaped clamp block, and locking bolts are provided on the connecting blocks for locking the first arc-shaped clamp block and the second arc-shaped clamp block, and grooves matching the U-shaped grooves are provided on the inner walls of the first arc-shaped clamp block and the U-shaped clamp grooves are arranged in the grooves.

3. The integrated water finding and plugging string for horizontal wells based on distributed optical fiber according to claim 1, characterized in that: An anti-scratch layer is provided on the inner wall of the U-shaped slot.

4. The integrated water finding and plugging string for horizontal wells based on distributed optical fiber according to claim 3, characterized in that: The anti-scratch layer is a rubber layer, and the rubber layer is bonded to the two inner side walls of the U-shaped slot.

5. The integrated water finding and plugging string for horizontal wells based on distributed optical fiber according to claim 1, characterized in that: It also includes two end packers arranged at one end of the oil pipe located deep in the horizontal well, a top packer arranged at the vertical part of the oil pipe located in the horizontal well, and a ground integrated control system arranged on the ground, an installation spacing is arranged between the two end packers, and a throttle valve is arranged on the oil pipe within the installation spacing.

6. The integrated water finding and plugging string for horizontal wells based on distributed optical fiber according to claim 1, characterized in that: The opening end of the U-shaped slot is provided with an anti-slip layer on the contact surface of the oil pipe.

7. The integrated water finding and plugging string for horizontal wells based on distributed optical fiber according to claim 6, characterized in that: The anti-slip layer is a rubber layer, and the rubber layer is riveted on the U-shaped slot.

8. The integrated water finding and plugging string for horizontal wells based on distributed optical fiber according to claim 1, characterized in that: The contact portion between the clamp mechanism and the oil pipe is serrated.

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