Vertical drilling hole bottom reverse circulation deslagging device based on jet flow entrainment principle

Abstract

The invention relates to a vertical drilling hole bottom reverse circulation deslagging device based on the jet entrainment principle. The vertical drilling hole bottom reverse circulation deslagging device comprises a nozzle body, a flow outlet is formed in the wall of the nozzle body, the interior of the nozzle body is connected with a nozzle installation base through a screw, and a Laval convergent nozzle is installed on the nozzle installation base; the bottom of the nozzle body is connected with a filtering mechanism, and a sediment collecting mechanism and a suction mechanism are arranged outside and at the bottom of the filtering mechanism respectively. By arranging the Laval convergent nozzle, jet flow is formed, entrainment of sediment is facilitated, speed reduction and sedimentation of the sediment are facilitated, and the device is simple in structure, convenient to operate, economical and practical.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vertical well hole bottom slag removal, and particularly relates to a vertical borehole bottom back flushing slag removal device based on the jet flow entrainment principle. BACKGROUND

[0002] China has three types of organic matter-rich shale, namely marine facies, marine-terrestrial facies and terrestrial facies coal measures and lacustrine facies, all of which have conditions for shale gas formation and enrichment, and shale gas resources are abundant. China has made important progress in shale gas resource potential evaluation and pilot exploration and development, and is vigorously developing effective development of shale gas resources. In the process of drilling, because of the complex geological conditions of the stratum, with the increase of drilling depth, downhole sand production, scaling and corrosion often occur, and even part of the drill bit is worn, peeled and fallen off, which seriously affects the drilling process, so it is necessary to effectively and quickly fish the sand and wear debris. Patent CN107558941A horizontal oil well in-hole debris fishing device invents a device for fishing objects in the well by using clamps, but it cannot fish small objects and sediments; patent CN107780862A invents a downhole choke fisher device, which uses a series of actions to grab and fish, but the structure is too complex and difficult to implement; patent CN208380542U invents a retractable downhole fishing barrel, which uses a structure to clamp and fish, but the structure of the fishing object is strictly required; patent CN108756800A invents a welded downhole fishing tool, which is welded and fixed in the well and then fished, which has poor feasibility and is only suitable for large weldable objects. The above technical methods are not suitable for fishing sand and sediments in the existing shale gas wellbore, and cannot meet the needs of the actual situation. SUMMARY

[0003] The purpose of the present application is to overcome the shortcomings of the prior art, and provide a vertical borehole bottom back flushing slag removal device based on the jet flow entrainment principle, which solves the problem that the bottom sediments cannot be cleaned completely, and various shapes and sizes of sediments can be carried out by entrainment.

[0004] The present application is achieved by the following technical solutions: A vertical borehole bottom back flushing slag removal device based on the jet flow entrainment principle, comprising a nozzle body connected with an upper joint, an outflow port is arranged on the wall of the nozzle body, a nozzle mounting seat is connected in the nozzle body by a screw, and a Laval convergent nozzle is mounted on the nozzle mounting seat; a filtering mechanism is connected to the bottom of the nozzle body, and a sediment collection mechanism and a suction mechanism are arranged outside and at the bottom of the filtering mechanism respectively.

[0005] According to the technical scheme, the upper joint is connected with the high-pressure water pipe outlet arranged outside, high-pressure water is sprayed out from the nozzle body, enters the bottom of the drill hole through the outflow port, collides with the sediment, and enters the suction mechanism together with the sediment, and is deposited in the suction mechanism after being filtered by the filtering mechanism.

[0006] Preferably, the filtering mechanism comprises a filtering top rod connected with the inner thread of the lower end of the nozzle body, the lower end of the filtering top rod is connected with a filtering connecting rod through an inner thread, the lower end of the filtering connecting rod is connected with a filtering screen pipe through an outer thread, and the lower end of the filtering screen pipe is connected with a filtering centralizer through an inner thread.

[0007] The filtering screen pipe can separate the turbulent flow of the upwelling sediment; and the filtering centralizer can keep the balance of the filtering screen pipe.

[0008] Preferably, a flow splitting cone is connected with the lower end of the filtering centralizer. The flow splitting cone can reduce the speed of the turbulent flow of the upwelling sediment.

[0009] Preferably, the sediment collecting mechanism comprises a filtering body connected with the outer thread of the lower end of the nozzle body and a collecting pipe connected with the outer thread of the lower end of the filtering body, and the bottom of the collecting pipe is connected with the suction mechanism.

[0010] Preferably, the suction mechanism comprises a lower suction rod body connected with the outer thread of the lower end of the collecting pipe, a lower suction centralizer connected with the lower suction rod body, and a lower suction top rod connected with the upper end of the lower suction centralizer through a lower suction connecting rod.

[0011] Preferably, the top plate of the lower suction top rod is transversely penetrated. The lower suction top rod can reduce the speed of the turbulent flow of the upwelling sediment.

[0012] Preferably, the upper end of the lower suction rod body is funnel-shaped. The lower suction centralizer can be quickly installed in the lower suction rod body.

[0013] Preferably, the lower suction top rod and the flow splitting cone are separately arranged.

[0014] Preferably, the number of the Laval convergent nozzles and the outflow ports is three, and the Laval convergent nozzles and the outflow ports are both at an angle of 15° with the axis; and the direction of the Laval convergent nozzles is consistent with the direction of the outflow ports. This helps to deliver the jet flow formed by the Laval convergent nozzles to the bottom sediment sand area as much as possible.

[0015] The beneficial effects of the present application are: ①The high-pressure entraining jet beam formed by the Laval convergent nozzles helps to entrain and carry the bottom sediment; ②The lower suction top rod helps to reduce the speed of the sediment and make it settle down; 3. The filter screen pipe is arranged to help the settlement and collection of the precipitate; The present application has the characteristics of simple structure, convenient operation and economic practicability. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present application; Figure 2 It is a structural schematic diagram of the nozzle body of the present application; Figure 3 It is a structural schematic diagram of the nozzle mounting seat of the present application; Figure 4 It is a structural schematic diagram of the Laval convergent nozzle of the present application; Figure 5 It is a structural schematic diagram of the upper joint of the present application; Figure 6 It is a structural schematic diagram of the filter ejector rod of the present application; Figure 7 It is a structural schematic diagram of the filter connecting rod of the present application; Figure 8 It is a structural schematic diagram of the filter screen pipe of the present application; Figure 9 It is a structural schematic diagram of the filter body of the present application; Figure 10 It is a structural schematic diagram of the collection pipe of the present application; Figure 11 It is a structural schematic diagram of the filter centralizer of the present application; Figure 12 It is a structural schematic diagram of the flow divider cone of the present application; Figure 13 It is a structural schematic diagram of the lower suction centralizer rod of the present application; Figure 14 It is a structural schematic diagram of the lower suction connecting rod of the present application; Figure 15 It is a structural schematic diagram of the lower suction ejector rod of the present application; Figure 16 It is a structural schematic diagram of the lower suction rod body of the present application.

[0017] In the figure: 1, nozzle body; 11, nozzle mounting seat; 111, Laval convergent nozzle; 12, outlet; 2, upper joint; 3, filter ejector rod; 31, filter connecting rod; 311, filter screen pipe; 4, filter body; 5, collection pipe; 6, filter centralizer; 61, flow divider cone; 7, lower suction centralizer rod; 71, lower suction connecting rod; 711, lower suction ejector rod; 8, lower suction rod body. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention 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 merely illustrative and not intended to limit the invention. Example 1

[0019] A reverse circulation slag removal device for the bottom of a vertical borehole based on the principle of jet entrainment, such as... Figures 1-16 As shown, the nozzle body 1 is connected to the upper connector 2. A nozzle mounting base 11 is connected inside the nozzle body 1 by screws. A Laval converging nozzle 111 is mounted on the nozzle mounting base 11. The Laval converging nozzle 111 helps to form a high-pressure jet that entrains bottom sediment and gravel. An outlet 12 is also provided on the wall of the nozzle body 1. There are three Laval converging nozzles 111 and three outlets 12, all at a 15° angle to the axis. The direction of the Laval converging nozzles 111 is consistent with the direction of the outlets 12, which helps to deliver the jet formed by the Laval converging nozzles 111 as far as possible to the bottom sediment and gravel area.

[0020] The lower end of the nozzle body 1 is connected to a filter push rod 3 via an internal thread. The lower end of the filter push rod 3 is connected to a filter connecting rod 31 via an internal thread. The lower end of the filter connecting rod 31 is connected to a filter screen tube 311 via an external thread. The filter screen tube 311 helps to separate the upward turbulent flow of sediment. The lower end of the filter screen tube 311 is connected to a filter stabilizer 6 via an internal thread. The filter stabilizer 6 helps to maintain the balance of the filter screen tube 311. The lower end of the filter stabilizer 6 is connected to a flow divider cone 61. The flow divider cone 61 helps to decelerate the upward turbulent flow of sediment.

[0021] A filter body 4 is connected to the lower end of the nozzle body 1 via an external thread. A collection pipe 5 is connected to the lower end of the filter body 4 via an external thread. The collection pipe 5 helps to collect settled sediment. A funnel-shaped lower suction rod body 8 is connected to the bottom of the collection pipe 5 via an external thread. A lower suction straightening rod 7 is connected to the upper end of the lower suction rod body 8. The upper end of the lower suction straightening rod 7 is connected to the lower suction top rod 711 via a lower suction connecting rod 71. The top plate of the lower suction top rod 711 is transversely open, and the lower suction top rod 711 helps to decelerate the upward turbulent flow of sediment. Furthermore, the lower suction top rod 711 and the flow divider cone 61 are separated and do not contact each other.

[0022] Specific implementation process: When used on site, the operator shall follow the instructions of the salvage tool. Figure 1After installation, the outlet of the high-pressure water pipe is connected to the upper end of the upper joint 2, and the fishing tool is vertically lowered to the shale gas well sediment position. The high-pressure water is sprayed through the Laval convergent nozzle 111 to form a high-pressure water jet, which is sprayed out through the outlet 12, collides with the shale gas well wall, moves downward in the vertical direction, and collides with the sediment after reaching the bottom sediment position, and drives the sediment into the fishing tool through the lower suction rod body 8, and flows to the fishing tool cavity through the left and right ends of the lower suction rod 711. When the Laval convergent nozzle 111 sprays, a certain negative pressure is generated, that is, the fluid drives the sediment to continue to move upward, to the filter screen pipe 311, filters the sediment, and sinks into the collection pipe 5. After filtration, the fluid enters the inside of the filter screen pipe 311 and continues to move upward, forming a cycle, and reciprocating, to fish the bottom sediment into the collection pipe 5. After a certain period of time, the fisher is fished out, the sediment in the collection pipe 5 is poured out, and the above is repeated for fishing again.

[0023] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A vertical borehole bottom reverse circulation residue discharging device based on the jet flow entrainment principle, characterized in that: The application relates to a nozzle body (1) connected with an upper joint (2), wherein an outflow port (12) is arranged on the wall of the nozzle body (1), a nozzle mounting base (11) is connected with the nozzle body (1) through screw connection, and a Laval convergent nozzle (111) is arranged on the nozzle mounting base (11); a filter mechanism is connected with the bottom of the nozzle body (1), a sediment collection mechanism and a suction mechanism are arranged outside and at the bottom of the filter mechanism respectively.

2. A vertical borehole bottom reverse circulation debris removal device based on the principle of jet flow entrainment according to claim 1, characterized in that: The filter mechanism comprises a filter top rod (3) connected with the inner thread of the lower end of the nozzle body (1), the lower end of the filter top rod (3) is connected with a filter connecting rod (31) through inner thread connection, the lower end of the filter connecting rod (31) is connected with a filter screen pipe (311) through outer thread connection, and the lower end of the filter screen pipe (311) is connected with a filter centralizer (6) through inner thread connection.

3. A vertical borehole bottom reverse circulation debris removal device based on the principle of jet flow entrainment according to claim 2, characterized in that: A flow separation cone (61) is connected with the lower end of the filter centralizer (6).

4. The vertical borehole bottom reverse circulation debris removal device based on the jet flow entrainment principle according to claim 1, characterized in that: The sediment collection mechanism comprises a filter body (4) connected with the outer thread of the lower end of the nozzle body (1) and a collection pipe (5) connected with the outer thread of the lower end of the filter body (4), and the bottom of the collection pipe (5) is connected with the suction mechanism.

5. The vertical borehole bottom reverse circulation debris removal device based on the jet flow entrainment principle according to claim 3, characterized in that: The suction mechanism comprises a lower suction rod body (8) connected with the outer thread of the lower end of the collection pipe (5), a lower suction centralizer rod (7) connected with the lower suction rod body (8), and a lower suction top rod (711) connected with the upper end of the lower suction centralizer rod (7) through a lower suction connecting rod (71).

6. A vertical borehole bottom reverse circulation debris removal device based on the principle of jet flow entrainment according to claim 5, characterized in that: The top plate of the lower suction top rod (711) is transversely penetrated.

7. A vertical borehole bottom reverse circulation debris removal device based on the principle of jet flow entrainment according to claim 5, characterized in that: The upper end of the lower suction rod body (8) is funnel-shaped.

8. The vertical borehole bottom reverse circulation debris removal device based on the jet flow entrainment principle according to claim 5, characterized in that: The lower suction top rod (711) and the flow separation cone (61) are separately arranged.

9. The vertical borehole bottom hole reverse circulation debris removal device based on the jet flow entrainment principle according to claim 1, characterized in that: The Laval convergent nozzle (111) and the outflow port (12) are all three, and the Laval convergent nozzle (111) and the outflow port (12) are all at an angle of 15 degrees with the axis; the direction of the Laval convergent nozzle (111) is consistent with the direction of the outflow port (12).

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