Rotary tool for downhole operation

Abstract

The utility model relates to the field of machinery, and discloses a rotary tool for downhole operation, which comprises an upper joint, a protective outer cylinder is fixedly connected to the bottom of the upper joint, a spiral groove inner cylinder is sleeved in the protective outer cylinder, a plurality of spiral grooves are arranged on the outer wall of the spiral groove inner cylinder, a return spring is sleeved outside the spiral groove inner cylinder, and a plurality of spiral grooves are arranged on the spiral groove inner cylinder. The bottom end of the return spring is fixedly connected with a sliding connector, the bottom of the sliding connector is fixedly connected with a rotating inner cylinder, and the bottom of the rotating inner cylinder is fixedly connected with a lower connector. In the utility model, the rotation function is realized under the condition of no hydraulic power, the damage of external liquid to a coal reservoir is avoided, the rotation function can be realized only by moving up and down, the operation is simple and convenient, the risk that a pipe string is blocked in horizontal well sand fishing is reduced, the device is directly connected with a pen point, the distance is short, and the formed rotation torque acts on the sand surface, so that the operation is simple and convenient. And the passing capacity and efficiency of the bailing pipe string are improved.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a rotary tool for underground operations. Background Art

[0002] As an important technology for unconventional oil and gas development, horizontal well drilling, completion and production increase technology has become an important technical measure to increase the single-well production of coalbed methane in the Qinshui Basin, the eastern edge of the Ordos Basin and other areas. By the end of 2020, a total of 19,540 wells had been drilled in the country, including 1,677 horizontal wells, 12,880 of which were put into production, with a production of 58.2×108m3. In the early stages of coalbed methane horizontal well technology, open-hole horizontal wells were mainly used, with high production in the early stages. In the later production process, coalbed wellbore collapse led to production reduction or shutdown, limiting coalbed methane production and recovery rate. In order to maintain coalbed wellbore stability and continuous production, mining began. PE screen completion technology is used to support the wellbore wall and control coal powder, but the PE screen has low strength and is easy to deform, and cannot ensure the integrity of the coal seam section wellbore, resulting in a high risk of sand flushing, sand bailing and transformation inside the pipe, which restricts the production and recovery rate of coalbed methane horizontal wells. Subsequently, fiberglass and steel completion and sand control pipes with good permeability and high strength gradually replaced the PE screen to maintain wellbore stability and control coal powder. Degradable drilling fluid and jet well washing technology are used to reduce the wellbore skin coefficient and improve the permeability of the coal seam near the wellbore wall. For primary coal and fragmented coal seams with poor permeability, casing directional perforation and staged fracturing technology is used to increase the coalbed methane production of a single well.

[0003] After a long period of production operations, they all face the problem of production reduction caused by coal powder blockage in coalbed methane horizontal wells. In response to the phenomenon of sand spitting and coal powder accumulation in horizontal wells, the method adopted in the early stage was large-volume hydraulic sand flushing and well washing operations. This method has a large amount of sand flushing at one time, can thoroughly clean the bottom of the well, and has a simple process. However, the coal reservoir is an under-pressure reservoir, especially after 2 to 3 years of drainage, the formation pressure coefficient is low. If a large-volume hydraulic sand flushing operation is adopted, a large amount of sand flushing fluid will leak into the formation and pollute the coal reservoir. In addition, when the formation pressure coefficient becomes low, well washing operations are carried out, and when the circulating fluid is difficult to return to the ground, the hydraulic sand flushing method becomes invalid. Large-volume hydraulic sand flushing and well washing operations are used to clean up coal powder and sand spitting in the horizontal section. After sand flushing and well washing, the average gas volume attenuation reaches more than 30%, and the production recovery period after the operation is more than 30 days. Since this method causes great damage to the reservoir and the gas volume is difficult to restore to normal levels, it was abandoned after poor test results.

[0004] At present, the method adopted is the conventional sand bailing process, which simply sucks coal powder and sand from the well into the sand storage pipe to solve the problem of coal powder blockage. Through production practice, it is known that after a long period of drainage and production, a large amount of coal powder sand will exist in the horizontal section of the coalbed methane horizontal well and form a cemented sand surface. The conventional sand bailing process can only rely on the pen tip to impact it to achieve the sand breaking effect, but due to the influence of the friction resistance of the horizontal well section, the force will be significantly reduced, the sand breaking efficiency will be reduced, the passing rate of the sand bailing pipe string will be low, and the construction period will be extended. Therefore, a rotary tool for underground operations is proposed to solve the above problems. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a rotary tool for underground operations, which aims to improve the conventional sand bailing process, which can only rely on the pen tip to impact it to achieve the sand breaking effect. However, due to the influence of the friction resistance of the horizontal well section, the force is significantly reduced, the sand breaking efficiency is reduced, the passing rate of the sand bailing pipe string is low, and the construction period is extended.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a rotary tool for downhole operations, comprising an upper joint, a protective outer cylinder fixedly connected to the bottom of the upper joint, a spiral groove inner cylinder is sleeved inside the protective outer cylinder, a plurality of spiral grooves are opened on the outer wall of the spiral groove inner cylinder, a return spring is sleeved outside the spiral groove inner cylinder, a sliding joint is fixedly connected to the bottom of the sliding joint, a rotating inner cylinder is fixedly connected to the bottom of the rotating inner cylinder, and a lower joint is fixedly connected to the bottom of the rotating inner cylinder.

[0007] As a further description of the above technical solution:

[0008] The top end of the spiral groove inner tube is fixedly connected to the inside of the upper joint, and the top end of the return spring is fixedly connected to the bottom end of the upper joint.

[0009] As a further description of the above technical solution:

[0010] The outside of the sliding joint is slidably connected to the inner wall of the protective outer cylinder.

[0011] As a further description of the above technical solution:

[0012] The return spring is sleeved on the inside of the protective outer tube, and the sliding joint is slidably connected to the inside of the spiral groove.

[0013] As a further description of the above technical solution:

[0014] The outer wall of the rotating inner cylinder is slidably connected to the inner wall of the protective outer cylinder.

[0015] As a further description of the above technical solution:

[0016] The lower joint pipe diameter is 40 mm.

[0017] As a further description of the above technical solution:

[0018] The thickness of the rotating inner cylinder is 5.5 mm.

[0019] As a further description of the above technical solution:

[0020] The wall thickness of the protective outer cylinder is 5 mm.

[0021] The utility model has the following beneficial effects:

[0022] 1. The rotation function is realized without hydraulic force, thus avoiding the damage of foreign liquid to the coal reservoir.

[0023] 2. The rotation function can be realized by moving up and down, which is simple and convenient to operate and reduces the risk of sand bailing and pipe string jamming in horizontal wells.

[0024] 3. It is directly connected to the pen tip and the distance is short, so the rotation torque formed acts more on the sand surface, increasing the passing capacity and efficiency of the sand bailing pipe string. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a three-dimensional schematic diagram of a rotary tool for underground operations proposed by the utility model;

[0026] Figure 2 This is a schematic structural diagram of a spiral groove inner barrel of a rotary tool for underground operations proposed by the utility model;

[0027] Figure 3 This is a structural schematic diagram of an upper joint of a rotary tool for underground operations proposed by the utility model;

[0028] Figure 4 This is a structural schematic diagram of a sliding joint of a rotary tool for underground operations proposed by the utility model;

[0029] Figure 5 The utility model is a schematic structural diagram of a lower joint of a rotary tool for underground operations.

[0030] Legend:

[0031] 1. Upper joint; 2. Protective outer cylinder; 3. Spiral groove inner cylinder; 4. Return spring; 5. Sliding joint; 6. Rotating inner cylinder; 7. Lower joint; 8. Spiral groove. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] Reference Figure 1 - Figure 5 The utility model provides an embodiment: a rotary tool for downhole operations, comprising an upper joint 1, a protective outer cylinder 2 is fixedly connected to the bottom of the upper joint 1, a spiral groove inner cylinder 3 is sleeved inside the protective outer cylinder 2, a plurality of spiral grooves 8 are opened on the outer wall of the spiral groove inner cylinder 3, a return spring 4 is sleeved outside the spiral groove inner cylinder 3, a sliding joint 5 is fixedly connected to the bottom end of the return spring 4, a rotating inner cylinder 6 is fixedly connected to the bottom of the sliding joint 5, a lower joint 7 is fixedly connected to the bottom of the rotating inner cylinder 6, the top end of the spiral groove inner cylinder 3 is fixedly connected to the inside of the upper joint 1, the top end of the return spring 4 is fixedly connected to the bottom of the upper joint 1, the outside of the sliding joint 5 is slidably connected to the inner wall of the protective outer cylinder 2, the outside of the return spring 4 is sleeved inside the protective outer cylinder 2, the inside of the sliding joint 5 is slidably connected to the inside of the spiral groove 8, the outer wall of the rotating inner cylinder 6 is slidably connected to the inner wall of the protective outer cylinder 2, the diameter of the lower joint 7 is 40 mm, the thickness of the rotating inner cylinder 6 is 5.5 mm, and the wall thickness of the protective outer cylinder 2 is 5 mm.

[0034] In the traditional downhole sand bailing pipe device, the end of the oil pipe is connected to a sand bailing pump. The sand is broken up by the cooperation of the sand bailing pump drive and the pen tip, and is transported out from the chamfered oil pipe through a single-flow valve. Since the pen tip and the single-flow valve are directly connected, the force is significantly reduced under the influence of friction in the horizontal well section, and the sand breaking efficiency is reduced.

[0035] Specifically, the upper joint 1 is used to connect with the check valve, the protective outer cylinder 2 is to protect the internal parts and prevent them from being damaged, a plurality of spiral grooves 8 are arranged on the outside of the spiral groove inner cylinder 3, the slider on the sliding joint is slidably arranged in the spiral groove, the spiral groove plays the role of limiting and guiding, so that the sliding joint 5 can rotate and drive the rotating inner cylinder 6 to realize spiral motion, the return spring 4 is used to reset the sliding joint 5, the sliding joint 5 is to allow the rotating inner cylinder 6 to move, under the limit of the protective outer cylinder 2, the sliding joint 5 can only move up and down, and will not move around, the rotating inner cylinder 6 is to drive the lower joint 7 to move synchronously, and the lower joint 7 is used to connect the pen tip to make the pen tip move synchronously.

[0036] Working principle: When using the device, first install the upper joint 1 of the device at the lower end of the check valve of the traditional device, and install the pen tip at the lower end of the lower joint 7. At this time, it starts to work normally. The oil pipe is pushed and pulled back and forth by an external mechanical device to drive the device to move up and down back and forth. When pressed down, the pen tip contacts the sand. At this time, the upper joint 1 drives the protective outer cylinder 2 to continue downward, and drives the spiral groove inner cylinder 3 to move downward synchronously. The relative sliding joint 5 starts to move upward, and under the action of the spiral groove 8 on the surface of the spiral groove inner cylinder 3, the sliding joint 5 starts to spirally rise, driving the rotating inner cylinder 6 to link the lower joint 7 to make the pen tip move synchronously. When the protective outer cylinder 2 moves upward, it drives the spiral groove inner cylinder 3 to move upward. Under the action of the return spring 4, the sliding joint 5 is pushed to move downward, and at the same time moves in the opposite direction, driving the pen tip to rotate synchronously, thereby forming a rotating sand breaking function, which increases the passing capacity and efficiency of the sand bailing pipe string.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotary tool for downhole operations, comprising an upper joint (1), characterized in that: The bottom of the upper joint (1) is fixedly connected to a protective outer cylinder (2), the interior of the protective outer cylinder (2) is sleeved with a spiral groove inner cylinder (3), the outer wall of the spiral groove inner cylinder (3) is provided with a plurality of spiral grooves (8), the exterior of the spiral groove inner cylinder (3) is sleeved with a return spring (4), the bottom end of the return spring (4) is fixedly connected to a sliding joint (5), the bottom of the sliding joint (5) is fixedly connected to a rotating inner cylinder (6), and the bottom of the rotating inner cylinder (6) is fixedly connected to a lower joint (7).

2. A rotary tool for downhole operations according to claim 1, characterized in that: The top end of the spiral groove inner cylinder (3) is fixedly connected to the interior of the upper joint (1), and the top end of the return spring (4) is fixedly connected to the bottom end of the upper joint (1).

3. A rotary tool for downhole operation according to claim 1, characterized in that: The sliding joint (5) is externally slidably connected to the inner wall of the protective outer cylinder (2).

4. A rotary tool for downhole operation according to claim 1, characterized in that: The return spring (4) is sleeved on the outside of the protective outer tube (2), and the sliding joint (5) is slidably connected to the inside of the spiral groove (8).

5. A rotary tool for downhole operation according to claim 1, characterized in that: The outer wall of the rotating inner cylinder (6) is slidably connected to the inner wall of the protective outer cylinder (2).

6. A rotary tool for downhole operation according to claim 1, characterized in that: The pipe diameter of the lower joint (7) is 40 mm.

7. A rotary tool for downhole operation according to claim 1, characterized in that: The thickness of the rotating inner cylinder (6) is 5.5 mm.

8. The rotary tool for downhole operation according to claim 1, characterized in that: The wall thickness of the protective outer cylinder (2) is 5 mm.

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