Repair scheme for casing deformation caused by underground rock stratum

Abstract

The invention discloses a scheme for repairing casing deformation caused by an underground rock stratum, which comprises a rock breaking mechanism and a casing repairing mechanism, the rock breaking mechanism is composed of a positioning camera, a punching drill bit, a hydraulic rock breaking drill bit, a hydraulic pump, a speed reducer, a hydraulic pump driving motor, a hydraulic cylinder, a cable connector, a shell, an electromagnet, a hydraulic pipeline, a drill bit propelling device and a drill bit rotating motor. The rock breaking mechanism is mainly used for detecting the deformation position of the casing pipe and conducting rock breaking operation on the casing pipe. The casing pipe repairing mechanism is composed of an expansion head, a stroke propeller, a centralizer and an anchoring device, and the underground position is fixed through the centralizer and the anchoring device to propel the expansion head to repair a deformed casing pipe. By means of the scheme, efficient repairing operation can be conducted on casing deformation accidents caused by rock strata.

Description

Technical Field

[0001] The invention relates to the field of casing deformation repair, and in particular to a repair scheme for casing deformation caused by underground rock formations. Background Art

[0002] As the duration of oilfield exploitation continues to increase and development work gradually deepens, the fluid field and pressure field in the oil well formation have undergone significant changes. At the same time, the frequent implementation of oil and water well measures and well repair construction, coupled with the combined influence of a series of factors such as well body structure design, completion and cementing quality, pipe performance and corrosion, has caused the technical status of oil and water well casings to deteriorate, which in turn has caused various casing damage problems such as rupture, deformation, perforation, and dislocation, and such problems are becoming more and more frequent. The formation conditions at the damaged location of the casing damaged well are quite complex, and they are often subjected to high-pressure extrusion, ground stress changes, rock formation subsidence and gravity, which lead to damage to the casing of the oil and water wells. Damaged casing will seriously affect the normal exploitation of the oil field, and the oil and gas production will drop rapidly, causing huge economic losses. Therefore, designing an efficient solution to repair casing deformation is of great significance for reducing losses and continuing development of oil and gas fields. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and propose a repair scheme for casing deformation caused by rock formations, which uses processes such as pipe drilling, rock breaking, pipe deformation repair, and pipe hole repair to efficiently complete the casing repair operation.

[0004] The purpose of the present invention is achieved through the following technical solutions: a repair scheme for casing deformation caused by rock formation, including a rock breaking mechanism and a casing repair mechanism. The rock breaking mechanism is composed of a cable connector, a housing, a hydraulic cylinder, an electromagnet, a hydraulic pump drive motor, a reducer, a hydraulic pump, a hydraulic pipeline, a drill bit propulsion device, a drill bit rotation motor, a positioning camera, a drilling drill bit, and a hydraulic rock breaking drill bit. The casing repair mechanism is composed of an anchoring device, a centralizer, a travel propeller, and an expansion head.

[0005] The effect of adopting the above technical solution is that there are four main process flows for pipe string repair, namely, pipe string drilling, rock breaking, pipe string deformation repair, and pipe string hole repair. The deformation position of the downhole casing is detected and located by the rock breaking mechanism. The casing deformation position is firstly drilled, and then the hydraulic rock breaking drill bit is inserted from the drilling position to break the rock, and then the rock breaking mechanism is recovered from the ground. After the recovery is completed, the casing repair mechanism is lowered, and the casing deformation part is repaired by the expansion head. After the repair is completed, the mechanism is recovered, and the repair pipe string is lowered to fill the drilling position of the pipe string, thereby completing the repair of the casing deformation.

[0006] In some embodiments, the positioning camera is located at the top of the housing, followed by the pipe wall perforating equipment consisting of a perforating drill bit, a drill bit propulsion device, and a drill bit rotating motor; a hydraulic rock breaking drill bit, and a hydraulic rock breaking equipment consisting of a hydraulic pump, a reducer, a hydraulic pump drive motor, and a hydraulic cylinder. The various fluid-using equipment are connected through hydraulic pipelines, and the cable connector is installed at the rear of the housing and connected to the ground cable to power the downhole equipment. The electromagnet is installed on the opposite side of the perforating drill bit and the hydraulic rock breaking drill bit.

[0007] In some embodiments, the positioning camera is composed of a number of downhole cameras evenly distributed circumferentially. After the rock breaking mechanism is lowered into the deformed pipe string through the cable, the positioning camera detects the deformation position of the pipe string and determines the size of the deformation position of the pipe string to locate the position of subsequent drilling and rock breaking. After the detection is completed, the circumferential position of the rock breaking mechanism is adjusted by rotation so that the drilling drill bit and the hydraulic rock breaking drill bit of the mechanism are aligned with the deformation direction of the pipe string. The ground cable is continued to be lowered until the drilling drill bit is aligned with the drilling position previously located by the positioning camera, and the tool rock breaking mechanism is adsorbed on the pipe string by energizing the electromagnet to complete the positioning. The hydraulic pump drives the drill bit propulsion device through the corresponding line of the hydraulic pipeline to propel the drilling drill bit out to drill the deformed position of the pipe string.

[0008] In some embodiments, after the rock breaking mechanism finishes the drilling operation, the electromagnet is powered off to make the tool active, the tool is lowered to align the position of the hydraulic rock breaking drill with the drilling position of the previous drilling drill, the electromagnet is powered on to make the tool adsorbed on the pipe string to complete the positioning, the hydraulic pump is started to provide power to the hydraulic rock breaking drill through the corresponding line of the hydraulic pipeline, and the hydraulic rock breaking drill is hydraulically driven to extend through the previous drilling position into the rock formation to rotate and spray high-pressure water jets to destroy the rock formation. After the rock breaking is completed, the electromagnet is powered off to recover the rock breaking mechanism through the ground.

[0009] In some embodiments, after the recovery is completed, the rock breaking mechanism lowers the casing repair mechanism from the ground to the location of the downhole tubing to be repaired, and the downhole circumferential position of the casing repair mechanism is fixed by a stabilizer. After the downhole position of the tool is determined, the anchoring device is deployed to complete the downhole positioning of the casing repair mechanism.

[0010] In some embodiments, after the casing repair mechanism is positioned, the expansion head is opened until it completely supports the pipe wall, and the travel pusher is used to push the expansion head forward so that it is squeezed and contacted with the deformed part of the pipe string to achieve the purpose of repairing the deformed pipe string.

[0011] In some embodiments, after the casing deformation is repaired, the drilling position of the pipe string needs to be repaired, and a section of the repair pipe string is lowered from the ground to the drilling position of the pipe string to complete the repair, thereby completing the entire process of casing deformation repair.

[0012] The beneficial effects of the present invention are:

[0013] There are three main processes in the casing deformation repair scheme, namely rock breaking, repairing the deformed pipe column, and repairing the holes in the pipe column. The rock breaking mechanism is lowered into the casing to be repaired, and the deformation position of the pipe column is detected by positioning the camera. The perforating drill bit drills holes in the deformed pipe column, and then the rock breaking drill bit breaks the rock layer at the deformed position. The rock layer at the position of the pipe column deformation is broken so that the deformed pipe column is no longer squeezed by the rock layer, which is convenient for subsequent repair operations. After the rock breaking is completed, the rock breaking mechanism is recovered and the casing repair mechanism is lowered. The downhole position of the casing repair mechanism is fixed, and then the expansion head is opened to squeeze and repair the deformed pipe column. Finally, the repair pipe column is lowered to complete the repair of the casing drilling position. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a general scheme diagram of a repair scheme for casing deformation caused by underground rock formations according to the present invention;

[0015] Figure 2 This is a process flow chart of a repair scheme for casing deformation caused by underground rock formations according to the present invention;

[0016] Figure 3 A schematic diagram of a pipe wall drilling operation of a repair scheme for casing deformation caused by underground rock formations according to the present invention;

[0017] Figure 4 A rock breaking operation diagram of a repair scheme for casing deformation caused by underground rock formations according to the present invention;

[0018] Figure 5 A schematic diagram of a pipe string repair mechanism for a repair scheme for casing deformation caused by underground rock formations according to the present invention;

[0019] Figure 6 A schematic diagram of a pipe string deformation repair operation of a repair scheme for casing deformation caused by downhole rock formations according to the present invention;

[0020] Figure 7 The present invention is a schematic diagram of a pipe string hole repair operation of a repair scheme for casing deformation caused by underground rock formations.

[0021] In the figure, 1-cable connector, 2-housing, 3-hydraulic cylinder, 4-electromagnet, 5-hydraulic pump drive motor, 6-reducer, 7-hydraulic pump, 8-hydraulic pipeline, 9-drill propulsion device, 10-drill rotation motor, 11-positioning camera, 12-drill bit, 13-hydraulic rock breaking drill bit, 14-anchoring device, 15-centralizer, 16-stroke thruster, 17-expansion head, 18-repair pipe string. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0023] Embodiment 1: Figures 1 to 7 As shown, a repair scheme for casing deformation caused by underground rock formations includes a rock breaking mechanism and a casing repair mechanism. The rock breaking mechanism consists of a cable connector 1, a housing 2, a hydraulic cylinder 3, an electromagnet 4, a hydraulic pump drive motor 5, a reducer 6, a hydraulic pump 7, a hydraulic pipeline 8, a drill bit propulsion device 9, a drill bit rotation motor 10, a positioning camera 11, a perforating drill bit 12, and a hydraulic rock breaking drill bit 13. The casing repair mechanism consists of an anchoring device 14, a straightener 15, a stroke propeller 16, and an expansion head 17. The positioning camera 11 is located at the top of the housing 2, and the pipe wall perforating device consisting of a perforating drill bit 12, a drill bit propulsion device 9, and a drill bit rotation motor 10 is arranged in sequence behind; the hydraulic rock breaking drill bit 13, and the hydraulic rock breaking device consisting of a hydraulic pump 7, a reducer 6, a hydraulic pump drive motor 5, and a hydraulic cylinder 3. The various fluid-using devices are connected through a hydraulic pipeline 11, and the cable connector 1 is installed at the tail of the housing 2 and connected to the ground cable to power the underground equipment. The electromagnet 4 is installed on the opposite side of the drilling bit 12 and the hydraulic rock breaking bit 13 .

[0024] Embodiment 2: Figures 1 to 4 As shown, on the basis of the first embodiment, the positioning camera 1 is composed of a number of downhole cameras uniformly distributed in the circumferential direction. After the rock breaking mechanism is lowered into the deformed pipe string through the cable, the positioning camera 1 detects the deformation position of the pipe string and determines the size of the deformation position of the pipe string to locate the position of subsequent drilling and rock breaking. After the detection is completed, the circumferential position of the rock breaking mechanism is adjusted by rotation so that the drilling drill 2 and the hydraulic rock breaking drill 3 of the mechanism are aligned with the deformation direction of the pipe string. The drilling drill 12 is continuously lowered through the ground cable until the drilling position previously located by the positioning camera 1 is positioned. The electromagnet 4 is energized to make the tool rock breaking mechanism adsorbed on the pipe string to complete the positioning. The hydraulic pump 7 drives the drill propulsion device 9 through the corresponding line of the hydraulic pipeline 11 to push the drilling drill 12 out to drill the deformed position of the pipe string. After the drilling operation is completed, the electromagnet 4 is powered off to make the tool active, and the tool is lowered to align the position of the hydraulic rock-breaking drill bit 13 with the drilling position of the previous drilling drill bit 12. The electromagnet 4 is powered on to make the tool adsorbed on the pipe column to complete the positioning, and the hydraulic pump 7 is started to provide power to the hydraulic rock-breaking drill bit 13 through the corresponding line of the hydraulic pipeline 11. The hydraulic drive hydraulic rock-breaking drill bit 13 extends through the previous drilling position into the rock formation to rotate and spray high-pressure water jets to destroy the rock formation. After the rock breaking is completed, the electromagnet 4 is powered off to recover the rock breaking mechanism through the ground.

[0025] Embodiment 3: Figure 2 , 5As shown in , 6, and 7, on the basis of the second embodiment, after the rock breaking mechanism is recovered, the casing repair mechanism is lowered from the ground to the location of the downhole pipe to be repaired, and the downhole circumferential position of the casing repair mechanism is fixed by the straightener 15. After the downhole position of the tool is determined, the anchoring device 14 is deployed to complete the downhole positioning of the casing repair mechanism. After the positioning of the casing repair mechanism is completed, the expansion head 17 is opened until it completely supports the pipe wall, and the expansion head 17 is pushed forward with the stroke pusher 16 to squeeze and contact with the deformed part of the pipe column to achieve the purpose of repairing the deformed pipe column. After the casing deformation is repaired, it is necessary to repair the drilling position of the pipe column described in claim 3, and a section of the repair pipe column 18 is lowered from the ground to the drilling position of the pipe column to complete the repair.

[0026] In summary, when performing the pipe string repair operation, first lower the rock breaking mechanism into the casing to be repaired, detect the deformation position of the pipe string by positioning the camera 1, drill holes in the deformed pipe string by the drilling bit 12, and then break the rock formation at the deformed position by the hydraulic rock breaking bit 13. By breaking the rock formation at the deformed position of the pipe string, the deformed pipe string part is no longer squeezed by the rock formation, which is convenient for subsequent repair operations. After the rock breaking is completed, the rock breaking mechanism is recovered and the casing repair mechanism is lowered. The anchoring device 14 is deployed to fix the downhole position of the casing repair mechanism, and then the expansion head 17 is opened to squeeze and repair the deformed pipe string. Finally, the repair pipe string 18 is lowered to complete the repair of the casing drilling position.

[0027] In the description of the present invention, it is necessary to understand that the terms "opposite side", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inside", "front", "center", "two ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 therefore cannot be understood as a limitation on the present invention; and those skilled in the art can know that the beneficial effects to be achieved by the present invention are only to achieve better beneficial effects under specific circumstances compared with the current implementation schemes in the prior art, rather than to directly achieve the best use effect in the industry.

[0028] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A repair scheme for casing deformation caused by underground rock formations, comprising a rock breaking mechanism and a casing repair mechanism. The rock breaking mechanism is composed of a cable joint (1), a housing (2), a hydraulic cylinder (3), an electromagnet (4), a hydraulic pump drive motor (5), a reducer (6), a hydraulic pump (7), a hydraulic pipeline (8), a drill bit propulsion device (9), a drill bit rotation motor (10), a positioning camera (11), a perforating drill bit (12), and a hydraulic rock breaking drill bit (13). The casing repair mechanism is composed of an anchoring device (14), a centralizer (15), a travel propeller (16), and an expansion head (17).

2. A repair scheme for casing deformation caused by underground rock formation according to claim 1, characterized in that: The positioning camera (11) is located at the top of the housing (2), and the following is the pipe wall drilling equipment consisting of a perforating drill bit (12), a drill bit propulsion device (9), and a drill bit rotating motor (10); a hydraulic rock breaking drill bit (13), and a hydraulic rock breaking equipment consisting of a hydraulic pump (7), a reducer (6), a hydraulic pump drive motor (5), and a hydraulic cylinder (3). The various fluid-using equipment are connected through a hydraulic pipeline (11), and a cable connector (1) is installed at the rear of the housing (2) and connected to a ground cable to power the downhole equipment. The electromagnet (4) is installed on the opposite side of the perforating drill bit (12) and the hydraulic rock breaking drill bit (13).

3. A repair scheme for casing deformation caused by underground rock formation according to claim 2, characterized in that: The positioning camera (1) is composed of a number of downhole cameras evenly distributed in the circumference. After the rock breaking mechanism is lowered into the deformed pipe column through the cable, the positioning camera (1) detects the deformation position of the pipe column and determines the size of the deformation position of the pipe column to locate the position of subsequent drilling and rock breaking. After the detection is completed, the circumferential position of the rock breaking mechanism is adjusted by rotation so that the drilling drill bit (2) and the hydraulic rock breaking drill bit (3) of the mechanism are aligned with the deformation direction of the pipe column. The drilling drill bit (12) is continuously lowered through the ground cable until the drilling position previously located by the positioning camera (1) is located. The electromagnet (4) is energized to make the tool rock breaking mechanism adsorbed on the pipe column to complete the positioning. The hydraulic pump (7) drives the drill bit propulsion device (9) through the corresponding line of the hydraulic pipeline (11) to propel the drilling drill bit (12) out to drill the deformed position of the pipe column.

4. A repair scheme for casing deformation caused by underground rock formations according to claim 3, characterized in that: After the drilling operation is completed, the electromagnet (4) is powered off to make the tool active, and the tool is lowered to align the hydraulic rock-breaking drill bit (13) with the drilling position of the previous drilling drill bit (12). The electromagnet (4) is powered on to make the tool adsorbed on the pipe column to complete the positioning, and the hydraulic pump (7) is started to provide power to the hydraulic rock-breaking drill bit (13) through the corresponding line of the hydraulic pipeline (11). The hydraulic drive hydraulic rock-breaking drill bit (13) extends through the previous drilling position into the rock formation to rotate and spray high-pressure water jets to destroy the rock formation. After the rock breaking is completed, the electromagnet (4) is powered off to recover the rock-breaking mechanism through the ground.

5. A repair scheme for casing deformation caused by underground rock formations according to claim 4, characterized in that: After the rock breaking mechanism is recovered, the casing repair mechanism is lowered from the ground to the location of the underground pipe column to be repaired, and the underground circumferential position of the casing repair mechanism is fixed by a centralizer (15). After the underground position of the tool is determined, the anchoring device (14) is deployed to complete the underground positioning of the casing repair mechanism.

6. A repair scheme for casing deformation caused by underground rock formations according to claim 5, characterized in that: After the casing repair mechanism is positioned, the expansion head (17) is opened until it completely supports the pipe wall, and the travel pusher (16) is used to push the expansion head (17) forward to make it squeeze and contact with the deformed part of the pipe string, thereby achieving the purpose of repairing the deformed pipe string.

7. A repair scheme for casing deformation caused by underground rock formations according to claim 6, characterized in that: After the casing deformation is repaired, the drilling position of the pipe string mentioned in claim 3 needs to be repaired, and a section of repair pipe string (18) is lowered from the ground to the drilling position of the pipe string to complete the repair, thereby completing the entire process of casing deformation repair.

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