Horizontal well cuttings removal device and operation method thereof

Abstract

The present invention provides a horizontal well rock cuttings removal device and an operation method thereof. The horizontal well rock cuttings removal device comprises: a barrel; a central tube, the central tube is located in the barrel and forms a compartment between the inner wall of the barrel, the two ends of the central tube are sealed and connected to the inner wall of the barrel so that the compartment is isolated from the central cavity of the barrel, and the central tube has a first connecting hole so that the central cavity is connected to the central cavity only through the first connecting hole; a nozzle, the nozzle is arranged in the compartment, a second connecting hole is arranged on the outer surface of the barrel, the outlet of the nozzle is arranged toward the second connecting hole, and a third connecting hole is also arranged on the outer surface of the barrel, and the third connecting hole, the compartment and the second connecting hole form a circulation flow path; a filtering structure, the filtering structure is arranged in the compartment so that the compartment is divided into a first cavity and a second cavity, the first cavity is directly connected to the second connecting hole, and the second cavity is directly connected to the third connecting hole. The present invention solves the problem that large-particle rock cuttings in the prior art cannot be effectively removed.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas drilling and completion, and in particular to a horizontal well cuttings removal device and an operating method thereof. Background Art

[0002] With the continuous deepening of exploration and development, the number of horizontal wells and extended-reach wells is increasing. However, in the key well sections of horizontal wells and extended-reach wells after the well inclination is greater than 40°, the efficiency of drilling fluid in carrying cuttings is low, and cuttings are easily accumulated to form cuttings beds, which often lead to problems such as difficulty in lowering the casing or failure to lower it in place. The conventional removal device and method is to stir the cuttings bed by short-circuiting the cuttings through a V-groove, and at the same time generate turbulence to re-suspend the cuttings particles, so that the drilling fluid can move the cuttings out of the wellbore in time. This method improves the cuttings removal rate to a certain extent, but some larger cuttings still cannot be effectively removed.

[0003] As can be seen from the above, there is a problem in the prior art that large rock cuttings cannot be effectively removed. Summary of the invention

[0004] The main purpose of the present invention is to provide a horizontal well cuttings removal device and an operation method thereof, so as to solve the problem that large-particle cuttings cannot be effectively removed in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a horizontal well cuttings removal device is provided, comprising: a barrel; a center pipe, the center pipe is located in the barrel and forms a compartment with the inner wall of the barrel, both ends of the center pipe are sealed and connected to the inner wall of the barrel to isolate the compartment from the central cavity of the barrel, and the center pipe has a first connecting hole so that the central cavity is connected to the compartment only through the first connecting hole; a nozzle, the nozzle is arranged in the compartment, a second connecting hole is arranged on the outer surface of the barrel, the outlet of the nozzle is arranged toward the second connecting hole, and a third connecting hole is also arranged on the outer surface of the barrel, and the third connecting hole, the compartment and the second connecting hole form a circulation flow path; a filtering structure, the filtering structure is arranged in the compartment so that the compartment is divided into a first cavity and a second cavity, the first cavity is directly connected to the second connecting hole, and the second cavity is directly connected to the third connecting hole.

[0006] Furthermore, the horizontal well cuttings removal device also includes a drainage pipe, which is arranged in the second connecting hole and extends toward the nozzle, and a drainage gap is formed between the nozzle and the drainage pipe.

[0007] Furthermore, the second communicating hole is located above the third communicating hole, and both the second communicating hole and the third communicating hole extend outwardly and downwardly with respect to the axial direction of the cylinder.

[0008] Furthermore, the first communicating hole is located above the second communicating hole, and the first communicating hole extends outwardly and downwardly with respect to the axial direction of the cylinder.

[0009] Furthermore, the inner diameter of the drainage tube is larger than the diameter of the first communicating hole.

[0010] Further, the diameter of the third connecting hole is greater than the diameter of the second connecting hole.

[0011] Furthermore, the cylinder body comprises an upper joint, a jet sleeve, a suction sleeve and a lower joint which are connected in sequence, the second connecting hole is arranged on the jet sleeve, and the third connecting hole is arranged on the suction sleeve.

[0012] Furthermore, the central tube includes a central tube body and a diverter sleeve, the diverter sleeve is located above the central tube body, and the first connecting hole is arranged on the diverter sleeve, the compartment is formed between the central tube body, the diverter sleeve and the cylinder, and the filtering structure is connected to the central tube body and the cylinder.

[0013] Furthermore, the upper joint has a first mounting flange extending toward the axis of the cylinder, and the diverter sleeve is fixed between the central tube body and the first mounting flange; the lower joint has a second mounting flange extending toward the axis of the cylinder, and the lower end of the central tube body is fixed on the second mounting flange.

[0014] According to another aspect of the present invention, there is provided an operating method for a horizontal well rock cuttings removal device, comprising: connecting the horizontal well rock cuttings removal device to a well-drilling tool assembly, marking the position of the horizontal well rock cuttings removal device and then lowering it into the well; when the horizontal well rock cuttings removal device is lowered into the dogleg position of the horizontal wellbore, starting the pump circulation and rotating the drill tool; after the well-drilling is completed, lifting the well-drilling tool assembly out of the well, unscrewing the lower joint and the suction sleeve to remove the rock cuttings.

[0015] By applying the technical solution of the present invention, the drilling fluid is directly sprayed into the drainage tube through the nozzle, and a siphon suction force is formed in the cavity between the central tube and the inner wall of the cylinder, so that the cuttings near the suction sleeve are sucked into the cavity. The filtering structure is used to prevent large particles of cuttings from moving upward and blocking the jet tube. In addition, a part of the drilling fluid passes through the drill bit, and can carry the cuttings near the drill bit to the suction sleeve position, thereby effectively removing large particles of cuttings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A cross-sectional schematic diagram of the horizontal well cuttings removal device of the present invention is shown.

[0018] The above drawings include the following reference numerals:

[0019] 10. Cylinder; 11. Upper joint; 12. Jet sleeve; 121. Second connecting hole; 13. Suction sleeve; 131. Third connecting hole; 14. Lower joint; 20. Center tube; 21. Center tube body; 22. Diverter sleeve; 221. First connecting hole; 30. Partition; 31. First cavity; 32. Second cavity; 40. Nozzle; 50. Filter structure; 60. Drainage tube. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0022] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0023] In order to solve the problem in the prior art that large-particle cuttings cannot be effectively removed, the present invention provides a horizontal well cuttings removal device and an operating method thereof.

[0024] Among them, the horizontal well cuttings removal device described below adopts the operating method of the horizontal well cuttings removal device described below.

[0025] like Figure 1 As shown, the horizontal well cuttings removal device includes a barrel 10, a central tube 20, a nozzle 40 and a filtering structure 50. The central tube 20 is located in the barrel 10 and forms a compartment 30 with the inner wall of the barrel 10. Both ends of the central tube 20 are sealed and connected to the inner wall of the barrel 10 so that the compartment 30 is isolated from the central cavity of the barrel 10. The central tube 20 has a first connecting hole 221 so that the central cavity is connected to the compartment 30 only through the first connecting hole 221. The nozzle 40 is arranged in the compartment 30, and a second connecting hole 121 is arranged on the outer surface of the barrel 10. The outlet of the nozzle 40 is arranged toward the second connecting hole 121. A third connecting hole 131 is also arranged on the outer surface of the barrel 10. The third connecting hole 131, the compartment 30 and the second connecting hole 121 form a circulation flow path. The filter structure 50 is disposed in the compartment 30 , so that the compartment 30 is divided into a first cavity 31 and a second cavity 32 . The first cavity 31 is directly connected to the second communication hole 121 , and the second cavity 32 is directly connected to the third communication hole 131 .

[0026] In this embodiment, the drilling fluid is directly sprayed into the second connecting hole 121 through the nozzle 40, and a siphon suction force is formed in the compartment 30 between the center pipe 20 and the inner wall of the cylinder 10, so that the rock cuttings near the third connecting hole 131 are sucked into the first cavity 31. The filtering structure 50 is used to prevent large particles of rock cuttings from moving upward and blocking the second connecting hole 121. In addition, a part of the drilling fluid passes through the drill bit, and can carry the rock cuttings near the drill bit to the third connecting hole 131, and enter the first cavity 31 through the third connecting hole 131, thereby effectively removing large particles of rock cuttings.

[0027] like Figure 1 As shown, the horizontal well cuttings removal device further includes a drainage pipe 60, which is arranged in the second connecting hole 121 and extends toward the nozzle 40, and a drainage gap is formed between the nozzle 40 and the drainage pipe 60. The drainage pipe 60 is sleeved with the nozzle 40 to drain the drilling fluid sprayed from the nozzle 40 to the outside of the barrel 10. The gap between the drainage pipe 60 and the nozzle 40 is to allow the drilling fluid to flow out from the first cavity 31 of the compartment 30 through the drainage pipe 60, so that the third connecting hole 131, the compartment 30, and the second connecting hole 121 form a circulation flow path.

[0028] Specifically, the second connecting hole 121 is located above the third connecting hole 131, and both the second connecting hole 121 and the third connecting hole 131 extend downward and outwardly relative to the axial direction of the cylinder 10. This is to keep the vertical direction consistent with the flow direction of the drilling fluid.

[0029] Specifically, the first connecting hole 221 is located above the second connecting hole 121, and the first connecting hole 221 extends downward and outwardly relative to the axial direction of the barrel 10. In this way, a part of the drilling fluid can flow out of the barrel 10 through the first connecting hole 221 and the second connecting hole 121, and a siphon suction force is formed in the compartment 30 between the central pipe 20 and the inner wall of the barrel 10.

[0030] In this embodiment, the inner diameter of the drainage tube 60 is larger than the diameter of the first connecting hole 221. The smaller diameter of the first connecting hole 221 increases the flow rate of the drilling fluid flowing through the first connecting hole 221, thereby enhancing the siphon suction force formed in the compartment 30 between the central pipe 20 and the inner wall of the barrel 10.

[0031] In this embodiment, the diameter of the third communication hole 131 is larger than the diameter of the second communication hole 121. The third communication hole 131 has a larger diameter to facilitate large particles of rock debris to enter the second cavity 32 of the compartment 30.

[0032] like Figure 1As shown, the cylinder 10 includes an upper joint 11 , a jet sleeve 12 , a suction sleeve 13 and a lower joint 14 connected in sequence, the second connecting hole 121 is arranged on the jet sleeve 12 , and the third connecting hole 131 is arranged on the suction sleeve 13 .

[0033] like Figure 1 As shown, the central pipe 20 includes a central pipe body 21 and a diverter sleeve 22, the diverter sleeve 22 is located above the central pipe body 21, and the first connecting hole 221 is provided on the diverter sleeve 22, the compartment 30 is formed between the central pipe body 21, the diverter sleeve 22 and the cylinder 10, and the filtering structure 50 is connected to the central pipe body 21 and the cylinder 10. Through the first connecting hole 221 provided on the diverter sleeve 22, a part of the drilling fluid can flow to the nozzle 40 and then flow out of the cylinder 10 through the drainage pipe 60, so as to provide power for forming a siphon suction force in the compartment 30 between the inner wall of the central pipe 20 and the cylinder 10.

[0034] like Figure 1 As shown, the upper joint 11 has a first mounting flange extending toward the axis of the cylinder 10, and the flow dividing sleeve 22 is fixed between the central tube body 21 and the first mounting flange; the lower joint 14 has a second mounting flange extending toward the axis of the cylinder 10, and the lower end of the central tube body 21 is fixed on the second mounting flange. By providing the first mounting flange and the second mounting flange, the connection between the upper joint 11, the central tube body 21 and the flow dividing sleeve 22 is more secure, and the connection between the lower joint 14 and the central tube body 21 is also more secure.

[0035] The operating method of the horizontal well cuttings removal device in the present invention comprises: connecting the horizontal well cuttings removal device to a well drilling tool assembly, marking the position of the horizontal well cuttings removal device and then lowering it into the well; when the horizontal well cuttings removal device is lowered into the dogleg position of the horizontal wellbore, starting the pump circulation and rotating the drilling tool; after the well drilling is completed, lifting the well drilling tool assembly out of the well, unscrewing the lower joint 14 and the suction sleeve 13 to remove the cuttings.

[0036] In this embodiment, the horizontal well rock cuttings removal device is connected between the drill bit and the drill pipe of the well drilling tool assembly, and the position of the horizontal well rock cuttings removal device is marked before it is lowered into the well. When the horizontal well rock cuttings removal device is lowered to the dogleg position of the horizontal wellbore, the pump is turned on to start circulating the drilling fluid and start rotating the drill tool. A portion of the drilling fluid is directly sprayed into the drainage pipe 60 through the nozzle 40, which can form a siphon suction force in the compartment 30 between the center pipe 20 and the inner wall of the barrel 10, and the rock cuttings near the suction sleeve 13 are sucked into the second cavity 32 of the compartment 30. The filter structure 50 is used to prevent large particles of rock cuttings from moving upward to block the drainage pipe 60. A portion of the drilling fluid passes through the drill bit, and the rock cuttings near the drill bit can be carried to the position of the suction sleeve 13, and enter the second cavity 32 of the compartment 30 through the third connecting hole 131 set on the suction sleeve 13. After the well is dredged, the well drilling tool assembly is lifted out of the well, and the rock cuttings can be removed by unscrewing the lower joint 14 and the suction sleeve 13. In addition, during the well-drilling process, the well-drilling drilling tool assembly can destroy the cuttings bed and salvage the cuttings, reduce the friction resistance of the casing lowering, and ensure the smooth lowering of the casing.

[0037] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the drilling fluid is directly sprayed into the drainage tube through the nozzle, and a siphon suction force is formed in the cavity between the central tube and the inner wall of the cylinder, so that the cuttings near the suction sleeve are sucked into the cavity, and the filtering structure is used to prevent large particles of cuttings from moving upward and blocking the jet tube. In addition, a part of the drilling fluid passes through the drill bit, and can carry the cuttings near the drill bit to the suction sleeve position, thereby effectively removing large particles of cuttings.

[0038] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A horizontal well cuttings removal device, characterized in that: include: Cylinder (10); a central tube (20), the central tube (20) being located inside the cylinder (10) and forming a compartment (30) with the inner wall of the cylinder (10), the two ends of the central tube (20) being sealedly connected to the inner wall of the cylinder (10) so that the compartment (30) is isolated from the central cavity of the cylinder (10), and the central tube (20) having a first communicating hole (221) so that the central cavity is connected to the compartment (30) only through the first communicating hole (221); a nozzle (40), the nozzle (40) being arranged in the compartment (30), a second communication hole (121) being arranged on the outer surface of the cylinder (10), an outlet of the nozzle (40) being arranged toward the second communication hole (121), a third communication hole (131) being further arranged on the outer surface of the cylinder (10), the third communication hole (131), the compartment (30), and the second communication hole (121) forming a circulation flow path; a filtering structure (50), the filtering structure (50) being arranged in the compartment (30) so that the compartment (30) is divided into a first cavity (31) and a second cavity (32), the first cavity (31) being directly connected to the second communication hole (121), and the second cavity (32) being directly connected to the third communication hole (131); The first communicating hole (221) is located above the second communicating hole (121), and the first communicating hole (221) extends outwardly and downwardly in an axial direction of the cylinder (10); The diameter of the third connecting hole (131) is greater than the diameter of the second connecting hole (121).

2. The horizontal well cuttings removal device according to claim 1, characterized in that: The horizontal well cuttings removal device further comprises a drainage pipe (60), wherein the drainage pipe (60) is arranged in the second communication hole (121) and extends toward the nozzle (40), and a drainage gap is formed between the nozzle (40) and the drainage pipe (60).

3. The horizontal well cuttings removal device according to claim 1, characterized in that: The second communicating hole (121) is located above the third communicating hole (131), and both the second communicating hole (121) and the third communicating hole (131) extend outwardly and downwardly in an axial direction relative to the cylinder (10).

4. The horizontal well cuttings removal device according to claim 2, characterized in that: The inner diameter of the drainage tube (60) is greater than the diameter of the first communication hole (221).

5. The horizontal well cuttings removal device according to any one of claims 1 to 4, characterized in that: The cylinder (10) comprises an upper joint (11), a jet sleeve (12), a suction sleeve (13) and a lower joint (14) which are connected in sequence, the second communication hole (121) being arranged on the jet sleeve (12), and the third communication hole (131) being arranged on the suction sleeve (13).

6. The horizontal well cuttings removal device according to claim 5, characterized in that: The central tube (20) comprises a central tube body (21) and a flow dividing sleeve (22); the flow dividing sleeve (22) is located above the central tube body (21), and the first connecting hole (221) is arranged on the flow dividing sleeve (22); the compartment (30) is formed between the central tube body (21), the flow dividing sleeve (22) and the cylinder (10); and the filtering structure (50) is connected to the central tube body (21) and the cylinder (10).

7. The horizontal well cuttings removal device according to claim 6, characterized in that: The upper joint (11) has a first mounting flange extending toward the axis of the cylinder (10), and the flow dividing sleeve (22) is fixed between the central pipe body (21) and the first mounting flange; The lower joint (14) has a second mounting flange extending toward the axis of the cylinder (10), and the lower end of the central tube body (21) is fixed on the second mounting flange.

8. A method for operating a horizontal well cuttings removal device, characterized in that: The horizontal well cuttings removal device is the horizontal well cuttings removal device according to claim 5, and the operating method comprises: Connecting the horizontal well rock cuttings removal device to the well drilling tool assembly, marking the position of the horizontal well rock cuttings removal device and then lowering it into the well; When the horizontal well cuttings removal device is lowered to the dogleg position of the horizontal wellbore, the pump circulation is started to rotate the drilling tool; After the well cleaning is completed, the well cleaning drilling tool assembly is lifted out of the well, and the lower joint (14) and the suction sleeve (13) are unscrewed to remove rock debris.

Images