Anti-settling structure used in downhole tool

Abstract

The utility model discloses an anti-settling structure used in a downhole tool, which comprises a locking structure and an anti-settling leather cup, the anti-settling leather cup comprises a pipe body, the lower end of the pipe body is provided with a connecting part, the upper end of the pipe body is provided with an inverted cone part which extends outwards in an inclined manner, the inner diameter of the pipe body is larger than that of the connecting part, and the connecting part is provided with an inverted cone part which extends outwards in an inclined manner. A clamping ring groove is formed in the outer side face of the connecting part. The locking structure comprises two symmetrical Haff joints, the inner wall of each Haff joint is provided with a limiting groove for containing the corresponding connecting part and a clamping ring block located on one side of the limiting groove, the clamping ring blocks are matched with the clamping ring grooves in a clamping mode, and the inner diameter of an inner hole defined by the two Haff joints is the same as the inner diameter of the corresponding connecting part; the problem that in the prior art, after slurry and impurities are directly solidified between a feeding tool and a tie-back barrel, the tie-back barrel is possibly damaged when the feeding tool is lifted is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of downhole special tools, and particularly relates to a anti-settling structure for downhole tools. BACKGROUND

[0002] In the cementing suspension operation, the tailpipe hanger is connected with the drill pipe through the running tool and is lowered into the well, and the tool is soaked in the mud for a long time during the lowering process, and the inside of the back connection cylinder is filled with mud during the lowering process. As the drilling depth is getting deeper and the formation pressure is getting higher, high-density mud is used to balance the formation pressure, and a large amount of weighting agents (such as barite, limestone, etc.) are usually added to the mud. During the drilling process, the mud in the back connection cylinder is in a relatively static state, and if the mud performance is poor, the weighting agent in the static mud for a long time will be deposited between the running tool and the back connection cylinder, and the impurities brought out of the well bottom by the mud during the circulation process may also be deposited in the back connection cylinder, causing the running tool and the tailpipe hanger to be separated and then pulled up, which is hindered, and hard pulling may cause damage to the back connection cylinder. SUMMARY

[0003] The utility model discloses a kind of anti-settling structures for downhole tools, solve the problem that mud and impurities are directly formed in running tool and back connection cylinder between solidification, running tool lifting possibly causes back connection cylinder damage.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] An anti-settling structure for downhole tools, comprising a locking structure and an anti-settling leather bowl, the anti-settling leather bowl comprises a tube body, the lower end of the tube body is provided with a connecting part, the upper end of the tube body is provided with an inverted cone part extending outwardly, the inner diameter of the tube body is greater than the inner diameter of the connecting part, and a clamping ring groove is formed on the outer side of the connecting part;The locking structure comprises two symmetrical half joints, the inner wall of the half joint is provided with a limiting groove accommodating the connecting part and a clamping ring block located on one side of the limiting groove, the clamping ring block is clamped and matched with the clamping ring groove, and the inner diameter of the inner hole formed by the two half joints is the same as the inner diameter of the connecting part.

[0006] Preferably, the anti-settling leather bowl is an integral structure.

[0007] Preferably, the wall thickness of the inverted cone part gradually decreases outwardly from the end of the tube body.

[0008] Preferably, the outer wall inclination angle of the inverted cone part is 5° larger than the inner wall inclination angle of the inverted cone part.

[0009] Preferably, a plurality of through holes are uniformly distributed on the tube body.

[0010] Preferably, one end of the half knot is provided with a plurality of first connecting holes distributed along the height direction, and the other end is provided with a plurality of second connecting holes distributed along the height direction, and the first connecting hole is provided with a countersunk groove at the opening.

[0011] Preferably, the hardness of the half knot is greater than the hardness of the anti-settlement skin bowl.

[0012] Preferably, the wall thickness of the pipe body is less than 5mm.

[0013] Beneficial effects:

[0014] The anti-settlement skin bowl is fastened on the running-in tool through the two half knots, so that the anti-settlement skin bowl is isolated from the running-in tool and the back connection cylinder, the mud and impurities flow into the anti-settlement skin bowl and the running-in tool, and the anti-settlement skin bowl is relatively deformed when the running-in tool is lifted, so that the resistance on the back connection cylinder can be avoided, and the back connection cylinder is not damaged.

[0015] The anti-settlement skin bowl is accommodated into the limiting groove through the connecting part, and is limited on the half knot through the cooperation of the clamping ring groove and the clamping ring block, so that good fixation is formed on the running-in tool after the half knot is locked, the inverted conical part is attached to the inner wall of the back connection cylinder to guide the mud and impurities to the inside, the amount of flowing into the back connection cylinder is reduced, the mud and impurities are isolated from the back connection cylinder through the anti-settlement skin bowl, the large resistance formed when the running-in tool is pulled up is avoided, and the possibility of damaging the back connection cylinder is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structure schematic view of the embodiment of the utility model;

[0017] Figure 2 It is a sectional structure schematic view of the embodiment of the utility model;

[0018] Figure 3 It is a structure schematic view of the anti-settlement skin bowl in the embodiment of the utility model;

[0019] Figure 4 It is a three-dimensional structure schematic view of the locking structure in the embodiment of the utility model;

[0020] Figure 5 It is a sectional structure schematic view of the locking structure in the embodiment of the utility model;

[0021] Figure 6 It is a structure schematic view of the application state of the embodiment of the utility model;

[0022] In Figures 1 to 6 In the embodiment, the correspondence between the component name or line and the drawing number is as follows:

[0023] Locking structure 1, half joint 11, limiting groove 12, clamping ring block 13, first connecting hole 14, second connecting hole 15, counterbore groove 16, anti-settlement skin bowl 2, pipe body 21, connecting part 22, inverted taper part 23, clamping ring groove 24, through hole 25. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0025] Referring to Figures 1-6 The embodiment of the utility model provides a kind of anti-settling structure for downhole tool, for installing on the tool of sending in, it is isolated between the tool of sending in and back joint tube, especially the position with step structure is installed, specific installation quantity can be increased or reduced according to matching relationship.Specifically, anti-settling structure includes locking structure 1 and anti-settling skin bowl 2, the anti-settling skin bowl 2 includes pipe body 21, the lower end of pipe body 21 is equipped with connecting part 22, the upper end of pipe body 21 is equipped with the inverted taper part 23 extending outwardly inclined, the inner diameter of pipe body 21 is greater than the inner diameter of connecting part 22, after being matched with the tool of sending in by connecting part 22, space for accommodating slurry and impurities is formed between pipe body 21 and the tool of sending in, and inverted taper part 23 is contacted with back joint tube to realize the flow guiding of slurry and impurities, avoid flowing into back joint tube, of course, cannot form complete seal, a small amount of slurry and impurities can still flow into back joint tube, but it is not enough to form obstruction after solidification.

[0026] Meanwhile, clamping ring groove 24 is formed on the outer side of connecting part 22, connecting part 22 is fastened and connected on the tool of sending in by locking structure 1, it is convenient to take up the tool of sending in and move with anti-settling structure synchronously, and the locking structure 1 includes two symmetrical half joints 11, the inner wall of half joint 11 is equipped with the limiting groove 12 for accommodating connecting part 22 and the clamping ring block 13 located at one side of limiting groove 12, the clamping ring block 13 is clamped and matched with clamping ring groove 24, the inner diameter of the inner hole formed by the enclosure of two half joints 11 is same with the inner diameter of connecting part 22, by embedding entire connecting part 22 into limiting groove 12, and letting clamping ring groove 24 and clamping ring block 13 form secondary limiting, reliable fastening of connecting part 22 is guaranteed after locking of two half joints 11, and half joint 11 is also fastened on the tool of sending in, guaranteeing that it can be synchronously lifted and moved with the tool of sending in.

[0027] Since the anti-settling skin bowl 2 can be synchronously lifted with the running-in tool, the mud settled in the inside will not be limited by the back connection cylinder, and the anti-settling skin bowl 2 itself has a deformable effect during the lifting process, so that the running-in tool can be smoothly lifted, and damage to the back connection cylinder is avoided.

[0028] Specifically, the anti-settling skin bowl 2 is of an integrated structure, facilitating installation, and the wall thickness of the inverted cone portion 23 is gradually reduced from the end of the pipe body 21 outward, and the edge position is in contact with the back connection cylinder, so that even if the mud solidifies, deformation is easy to occur to separate from the back connection cylinder, and the inverted cone portion 23 can guide the mud and impurities to mainly flow into the pipe body 21.

[0029] In order to improve the drainage effect, the outer wall of the inverted cone portion 23 is inclined at an angle greater than the inner wall of the inverted cone portion 23 by 5°.

[0030] In order to realize air flow in the pipe body 21 and collect mud and impurities as much as possible, a plurality of through holes 25 are arranged on the pipe body 21 in a circumferential direction, so that the mud and impurities can first fill the pipe body 21.

[0031] Specifically, one end of the half joint 11 is provided with a plurality of first connecting holes 14 arranged in a height direction, and the other end is provided with a plurality of second connecting holes 15 arranged in a height direction, a countersunk groove 16 is arranged at the opening of the first connecting hole 14, the first connecting hole 14 and the second connecting hole 15 are connected with fasteners to realize fastening connection, and the countersunk groove 16 is used for shielding the head of the fastener, so that the movement of the fastener is not hindered.

[0032] In order to enable the anti-settling skin bowl 2 to have a good deformation effect, the hardness of the half joint 11 is greater than the hardness of the anti-settling skin bowl 2, so that the anti-settling skin bowl 2 can be synchronously pulled out when the running-in tool is lifted, and will not be left in the inside. At the same time, the wall thickness of the pipe body 21 is less than 5mm, which is beneficial to the deformation of the anti-settling skin bowl 2 under stress, so that the anti-settling skin bowl 2 can be lifted to the outside of the back connection cylinder along with the running-in tool.

[0033] In the utility model, unless another definite provision and limitation, the terms "installation", "connection", "connection", "fixing" and the like terms should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] In the description of the utility model, it is necessary to explain that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer" and the like is the orientation or position relation based on the drawing shown or the orientation or position relation commonly placed when the utility model product is used, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0035] It is obvious for those skilled in the art that the utility model is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or essential characteristics of the utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any figure reference in the claims should not be regarded as limiting the claims involved.

Claims

1. An anti-settlement structure for downhole tools, characterized in that: It includes a locking structure (1) and an anti-settling cup (2). The anti-settling cup (2) includes a tube body (21). The lower end of the tube body (21) is provided with a connecting part (22). The upper end of the tube body (21) is provided with an outwardly inclined inverted cone part (23). The inner diameter of the tube body (21) is larger than the inner diameter of the connecting part (22). The outer side surface of the connecting part (22) is provided with a locking ring groove (24). The locking structure (1) includes two symmetrical half sections (11). The inner wall of the half section (11) is provided with a limiting groove (12) for accommodating the connecting part (22) and a locking ring block (13) located on one side of the limiting groove (12). The locking ring block (13) engages with the locking ring groove (24). The inner diameter of the inner hole formed by the two half sections (11) is the same as the inner diameter of the connecting part (22).

2. The anti-settlement structure for downhole tools according to claim 1, characterized in that: The anti-settlement cup (2) is an integral structure.

3. The anti-settlement structure for downhole tools according to claim 2, characterized in that: The wall thickness of the inverted cone portion (23) gradually decreases from the end of the tube body (21) outwards.

4. The anti-settlement structure for downhole tools according to claim 3, characterized in that: The inclination angle of the outer wall of the inverted cone (23) is 5° greater than the inclination angle of the inner wall of the inverted cone (23).

5. The anti-settlement structure for downhole tools according to claim 3, characterized in that: The tube (21) has multiple through holes (25) evenly distributed along the circumference.

6. A subsidence prevention structure for downhole tools according to any one of claims 1-5, characterized in that: One end of the split joint (11) is provided with a plurality of first connecting holes (14) evenly distributed along the height direction, and the other end is provided with a plurality of second connecting holes (15) evenly distributed along the height direction. The opening of the first connecting hole (14) is provided with a countersunk groove (16).

7. The anti-settlement structure for downhole tools according to claim 6, characterized in that: The hardness of the haf joint (11) is greater than that of the anti-settling cup (2).

8. The anti-settlement structure for downhole tools according to claim 7, characterized in that: The wall thickness of the tube (21) is less than 5 mm.

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