Rotary shaft pipe wall cleaning nipple

Abstract

The utility model discloses a rotary shaft pipe wall cleaning pup joint, and particularly relates to the technical field of oil and gas exploitation downhole tools, which comprises a pup joint main body, the upper end and the lower end of the pup joint main body are provided with screw buckle connecting parts, the upper part is provided with an upper hollow section with an upward opening, and the lower part is provided with a lower hollow section with a downward opening; a liquid outlet is formed in the side wall of the upper hollow section, and a liquid inlet is formed in the side wall of the lower hollow section; a rotating sleeve which is rotatably mounted is arranged on the nipple main body, a brush body structure is arranged outside the rotating sleeve, a gap is formed between the inner wall of the rotating sleeve and the nipple main body, the gap forms a nipple annulus, and a spiral blade structure is arranged on the inner wall of the rotating sleeve. By the adoption of the scheme, circulating fluid in the hot washing process serves as a power source to drive the circulating fluid to rotate, wax dirt on the inner wall of a shaft can be cleaned in combination with an external brush body structure, the utilization efficiency when the fluid serves as power is greatly improved, and relatively speaking, the structure is simple, reliability is extremely good, and batch implementation is better facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and gas exploitation downhole tool technical field, concretely relates to a rotary wellbore pipe wall cleaning nipple. BACKGROUND

[0002] In the later stage of production, due to the reasons such as the decrease of formation pressure, the change of fluid property, the aging of wellbore structure, sand production and wax and scale deposition at well wall often occur at well bottom. The occurrence of these phenomena seriously affects the overall production performance of oil well and oil and gas recovery. After sand production, if the liquid flow in the well cannot carry all the sand to the ground, the sand gradually deposits in the well, forms a sand column, blocks the oil outlet, increases the flow resistance, and reduces the production of oil well or even stops production. At the same time, sand production also causes the wear and damage of downhole equipment, increases the maintenance cost, and even causes downhole sand sticking accident, endangering personnel safety. On the other hand, wax deposition in oil well is very common, especially in the process of waxy crude oil exploitation. Due to the decrease of formation pressure and temperature, the wax in crude oil separates out or dissolves, forms crystalline or colloid, and adsorbs or deposits on the equipment. These wax deposits will affect the operation efficiency of the equipment, increase the production cost, and even cause damage to the equipment or block the wellbore.

[0003] In order to solve these problems, regular wax cleaning and sand washing are important ways to improve the production efficiency of oil well and prolong the service life of oil well. At present, various special wax cleaning tools have appeared on the market, such as the patent with the patent number "CN211448622U" and the name "a hot washing wax cleaning and descaling device". The structure of the patent adopts a rotary brush to remove stubborn wax scale on the inner wall of the wellbore. Specifically, the cleaning work is completed by driving the descaling brush with a motor. The applicant found in the research that the electric power transmission structure has relatively poor reliability when working in the well, various problems such as power and signal transmission need to be considered, the structure is complex, the cost is relatively high, and it is not conducive to batch implementation. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides a rotary wellbore pipe wall cleaning nipple, aiming at solving the problems such as poor reliability of the current rotary cleaning tool, complex structure and not conducive to batch implementation.

[0005] In order to achieve the above purpose, the technical scheme of the utility model is as follows.

[0006] A rotary wellbore pipe wall cleaning nipple, the key is that: the nipple main body including the structure of the rotary body, the upper and lower ends of the nipple main body have screw thread connection parts, the upper part of the nipple main body has an upper hollow section with an open top, the lower part has a lower hollow section with an open bottom, the middle part of the nipple main body is a solid body, the side wall of the upper hollow section is provided with a liquid outlet, and the side wall of the lower hollow section is provided with a liquid inlet.

[0007] The short section body is provided with a rotatable sleeve, the outer part of the rotatable sleeve is provided with a brush structure, the inner wall of the rotatable sleeve has a gap with the short section body, the gap forms an annular space of the short section, and the inner wall of the rotatable sleeve is provided with a spiral blade structure.

[0008] The fluid entering from the top of the upper hollow section can enter the annular space of the short section through the liquid outlet, impact the spiral blade structure to drive the rotatable sleeve to rotate, and finally enter the lower hollow section through the liquid inlet.

[0009] By using the above scheme, when in use, the short section is connected to the drilling tool assembly, the fluid entering from the top of the upper hollow section can enter the annular space of the short section through the liquid outlet, impact the spiral blade structure to drive the rotatable sleeve to rotate, and finally enter the lower hollow section through the liquid inlet. In this way, the impact force of the fluid drives the rotatable sleeve to rotate, and the external brush structure is used to clean the wax scale on the wellbore wall. The working process does not involve signal and power transmission, has excellent reliability, and has a simple structure and is convenient for batch implementation.

[0010] As a preferred, the outer wall of the rotatable sleeve is provided with a spiral groove, the upper and lower ends of the spiral groove are open, and when the fluid enters the spiral groove from bottom to top, the rotating direction of the rotatable sleeve is consistent with the rotating direction of the fluid impacting the spiral blade structure from top to bottom to drive the rotatable sleeve to rotate. By using the above scheme, when the fluid in the wellbore annulus circulates upward, the rotatable sleeve can also be driven to rotate, and the inner and outer parts jointly act, which can improve the rotating speed of the rotatable sleeve and reduce the pressure loss.

[0011] As a preferred, the spiral groove is at least three and is uniformly distributed along the circumference of the rotatable sleeve. By using the above scheme, the stability of the rotatable sleeve when rotating can be improved.

[0012] As a preferred, a spiral boss is formed between adjacent spiral grooves, and the brush structure is arranged on the spiral boss.

[0013] As a preferred, the brush structure is spirally distributed. By using the above scheme, the contact area with the inner wall of the wellbore can be increased, and the cleaning efficiency can be improved.

[0014] As a preferred, the upper and lower ends of the short section body are sleeved with support bearings, and the upper and lower ends of the rotatable sleeve are fixedly connected with the outer sleeves of the corresponding support bearings. By using the above scheme, the bearing support can ensure smooth rotation and reduce the fluid pressure required for rotation, and the implementation is easier.

[0015] As a preferred, the support bearing is a thrust bearing. By using the above scheme, the support bearing has good axial support ability, and the reliability can be improved.

[0016] As preferred: the rotating sleeve has a connecting ring between the rotating sleeve and the supporting bearing, and the connecting ring at least at the lower part has a rotating sealing structure between the connecting ring and the short section body.

[0017] Compared with the prior art, the utility model has the advantages of

[0018] The rotating wellbore pipe wall cleaning short section provided by the utility model uses circulating fluid in the hot washing process as a power source to drive its rotating work, and can clean wax scale on the inner wall of the wellbore in combination with the external brush body structure, can drive the rotation in the fluid downward and upward process, greatly improves the utilization efficiency of fluid as power, and has the advantages of simple structure, excellent reliability and good batch implementation. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the utility model;

[0020] Figure 2 It is a sectional view of Figure 1

[0021] Figure 3 It is a rotating sleeve structure schematic view;

[0022] Figure 4 It is an internal structure schematic view of Figure 3

[0023] Figure 5 It is a sectional view of Figure 3

[0024] Figure 6 It is a second embodiment of the spiral blade structure.

[0025] In the drawing: 100, short section body; 110, upper hollow section; 111, liquid outlet; 120, lower hollow section; 121, liquid inlet; 130, rotating sleeve; 131, brush body structure; 132, spiral blade structure; 133, spiral groove; 134, spiral boss; 140, short section annulus; 150, supporting bearing; 160, connecting ring; 170, anti-dropping step. DETAILED DESCRIPTION

[0026] The utility model is further described below in combination with the embodiments and the drawings.

[0027] Reference Figures 1 to 6 ​​​The illustrated rotary wellbore pipe wall cleaning short section mainly comprises a short section body 100 in the shape of a rotary body, the upper and lower ends of the short section body 100 are provided with screw thread connecting portions, through which the short section body 100 can be quickly connected with the upper and lower drilling tools, the upper part of the short section body 100 is provided with an upper hollow section 110 with an open top, the lower part is provided with a lower hollow section 120 with an open bottom, and the middle part of the short section body 100 is a solid body, the sidewall of the upper hollow section 110 is provided with a liquid outlet 111, and the sidewall of the lower hollow section 120 is provided with a liquid inlet 121.

[0028] The short section body 100 is provided with a rotating sleeve 130 rotatably mounted thereon, the rotating sleeve 130 is coaxially arranged with the short section body 100 and located on the circumferential outer side of the short section body 100, the outer part of the rotating sleeve 130 is provided with a brush body structure 131, the inner diameter of the rotating sleeve 130 is larger than the outer diameter of the short section body 100, and the inner wall of the rotating sleeve 130 has a gap with the short section body 100, which forms a short section annulus 140, the inner wall of the rotating sleeve 130 is provided with a helical blade structure 132, which can adopt an impeller structure as shown in Figure 6 , and a plurality of helical blades as shown in Figure 4 and Figure 5 , so that when the fluid impacts, the rotating sleeve 130 can be driven to rotate, the inner diameter of the helical blade structure 132 is slightly larger than the outer diameter of the short section body 100, so as to ensure that the fluid in the short section annulus 140 will pass through the helical blade structure 132 and generate a thrust force.

[0029] In use, the short section is connected to the drilling tool assembly, the circulating fluid injected from the ground enters from the top of the upper hollow section 110 through the drilling tool, and then enters the short section annulus 140 through the liquid outlet 111, impinges the helical blade structure 132 to drive the rotating sleeve 130 to rotate, and finally enters the lower hollow section 120 through the liquid inlet 121, and then returns to the lower drilling tool, the rotating sleeve is driven to rotate by the impact force of the fluid, and the external brush body structure is used to clean the wax scale on the wellbore pipe wall.

[0030] The axial load of the drilling tool in the present application is mainly borne by the short section body 100, so steel is used, and the rotating sleeve 130 is mainly used to drive the brush body structure 131 to rotate, so light and wear-resistant alloy materials are preferred in implementation.

[0031] In practice, the outer wall of the rotating sleeve 130 has a spiral groove 133, the upper and lower ends of the spiral groove 133 are open, it should be noted that when the fluid enters the spiral groove 133 from bottom to top, the rotating direction of the rotating sleeve 130 is consistent with the rotating direction of the fluid impacting the spiral blade structure 132 from top to bottom to drive the rotating sleeve 130 to rotate, then when setting the rotating direction of the spiral groove 133, the rotating direction of the spiral blade structure 132 needs to be referred to. In this embodiment, the spiral groove 133 has at least three, and a plurality of spiral grooves 133 are uniformly distributed along the circumference of the rotating sleeve 130, when manufacturing, the spiral groove 133 and the rotating sleeve 130 are integrally formed, and the spiral blade structure 132 can be fixed inside the rotating sleeve 130 by welding.

[0032] As shown in Figure 1 and Figure 3 , the adjacent two spiral grooves 133 form a spiral boss 134, and the brush body structure 131 is arranged on the spiral boss 134. The outer diameter of the brush body structure 131 is slightly larger than the inner diameter of the wellbore to be cleaned, and in practice, the brush body structure 131 can select a plate brush or a single cluster of brush hair planting structure. The plate brush can be directly installed on the spiral boss 134 by screws, which is convenient for later quick replacement. In order to reduce the wear of the pipe wall, the material of the brush hair is usually polyester fiber or nylon wire containing abrasive.

[0033] Referring to Figure 2 , the upper and lower ends of the short section body 100 are sleeved with support bearings 150, and the upper and lower ends of the rotating sleeve 130 are fixedly connected with the outer sleeves of the corresponding support bearings 150. In practice, the rotating sleeve 130 and the support bearing 150 have a connecting ring 160, and the connecting ring 160 between the lower connecting ring 160 and the short section body 100 has a rotating sealing structure. As shown in the figure, the inside of the connecting ring 160 is stepped, including a large diameter section and a small diameter section, the large diameter section is adapted to the outer diameter of the support bearing 150, and is fixedly connected with the corresponding support bearing 150, the two are interference fit or screwed, the small diameter section of the connecting ring 160 is adapted to the outer diameter of the short section body 100, and when installing, a sealing ring can be sleeved on the corresponding position of the short section body 100, and the gap between the connecting ring and the short section body 100 is sealed by the sealing ring, and the connecting ring 160 and the rotating sleeve 130 can be relatively fixed by screw connection.

[0034] In this embodiment, the support bearing 150 is a thrust bearing, which improves the axial support ability and prolongs the service life.

[0035] In addition, the lower part of the short section body 100 has an anti-falling step 170, as shown in Figure 1 and Figure 2As shown, the outer diameter of the anti-falling step 170 is greater than the inner diameter of the rotating sleeve 130, so that even if the connection between the rotating sleeve 130 and the connecting ring 160 or the support bearing 150 is disconnected, the stop by the anti-falling step 170 prevents the tool from directly falling to the bottom of the well, effectively improving the safety of the tool.

[0036] Reference Figures 1 to 6 As shown, the rotating wellbore pipe wall cleaning nipple is connected to the cleaning drilling tool assembly in use, and the rotating sleeve 130 is driven to rotate by the pumped well flushing fluid, and the wax scale on the wellbore pipe wall is cleaned by the external brush structure 131. During the return of the well flushing fluid from the wellbore annulus, the rotating sleeve 130 is also driven to rotate, that is, during the circulation of the well flushing fluid, whether the well flushing fluid enters the bottom of the well from top to bottom in the drilling tool or flows out of the wellhead from bottom to top in the annulus, the well flushing fluid can apply rotating power to the rotating sleeve 130, and the rotating sleeve 130 can continuously work, which is beneficial to improve the cleaning efficiency and quality.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present application, and those skilled in the art can make various similar expressions under the inspiration of the present application without violating the purpose and claims of the present application. Such changes fall within the scope of the present application.

Claims

1. A rotary wellbore tubular wall cleaning nipple characterized by: The short section body (100) comprises a rotary structure, the upper and lower ends of the short section body (100) are provided with screw thread connection parts, the upper part of the short section body (100) is provided with an upper hollow section (110) with an upward opening, the lower part is provided with a lower hollow section (120) with a downward opening, the middle part of the short section body (100) is a solid body, the side wall of the upper hollow section (110) is provided with a liquid outlet (111), and the side wall of the lower hollow section (120) is provided with a liquid inlet (121); The short section body (100) is provided with a rotating sleeve (130) rotatably installed thereon, the outer part of the rotating sleeve (130) is provided with a brush body structure (131), the inner wall of the rotating sleeve (130) has a gap with the short section body (100), and the gap forms a short section annulus (140); the inner wall of the rotating sleeve (130) is provided with a spiral blade structure (132).

2. The rotary well bore tubular wall cleaning nipple of claim 1, characterized by: The outer wall of the rotating sleeve (130) is provided with a spiral groove (133), the upper and lower ends of the spiral groove (133) are open, and when fluid enters the spiral groove (133) from the lower part to the upper part, the rotating direction of the rotating sleeve (130) is consistent with the rotating direction of the fluid from the upper part to the lower part to impact the spiral blade structure (132) to drive the rotating sleeve (130) to rotate.

3. The rotary well bore tubular wall cleaning nipple of claim 2, characterized by: The spiral groove (133) is at least three and is uniformly distributed along the circumference of the rotating sleeve (130).

4. The rotary well bore tubular wall cleaning nipple of claim 3, characterized by: The spiral convex (134) is formed between adjacent spiral grooves (133), and the brush body structure (131) is arranged on the spiral convex (134).

5. The rotary well bore tubular wall cleaning nipple of claims 1 or 2, wherein: The brush body structure (131) is distributed in a spiral shape.

6. The rotary well bore tubular wall cleaning nipple of claims 1 or 2, wherein: The upper and lower ends of the short section body (100) are provided with support bearings (150), and the upper and lower ends of the rotating sleeve (130) are fixedly connected with the outer sleeves of the corresponding support bearings (150).

7. The rotary well bore tubular wall cleaning nipple of claim 6, characterized by: The support bearing (150) is a thrust bearing.

8. The rotary well bore tubular wall cleaning nipple of claim 6, characterized by: The rotating sleeve (130) and the support bearing (150) are provided with a connecting ring (160), and the connecting ring (160) at least at the lower part is provided with a rotating sealing structure between the short section body (100).

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