Sand sweep tool

Abstract

The application provides a downhole sand sweeping tool, which comprises a sleeve assembly, a driving core shaft and a transmission assembly. The sleeve assembly comprises a positioning sleeve and a rotating sleeve connected to one end of the positioning sleeve. The rotating sleeve is movably connected to the positioning sleeve in the circumferential direction. The end of the rotating sleeve is a sand sweeping end. The driving core shaft is arranged in the sleeve assembly and can move axially relative to the sleeve assembly. The end of the driving core shaft close to the positioning sleeve is connected to a pulling cable. The transmission assembly comprises a helical groove arranged on the outer circumferential surface of the driving core shaft and a transmission member arranged on the inner wall of the rotating sleeve. The transmission member protrudes from the inner wall of the rotating sleeve and is matched to the inside of the helical groove. According to the technical scheme of the application, the deposition structure of the downhole sand and gravel can be stirred, so that the problem of difficult cleaning caused by the too tight deposition structure can be solved, and thus the loosened sand and gravel can be effectively carried out by the subsequent fluid, so that the purpose of complete cleaning can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of downhole fishing tools, in particular to a downhole sand sweeping tool. BACKGROUND

[0002] The existing downhole fishing tool cannot fish the outer fishing neck buried by sand, rock debris and the like for a long time, and thus it is necessary to clean the sand, rock debris and the like in the well first. At present, the existing technology can also study the cleaning of sand, rock debris and the like, but basically uses a single mode such as vacuum adsorption or fluid impact to clean the sand, rock debris and the like. Although these modes can achieve the cleaning of sand, rock debris and the like in principle, for the actual situation, the sand, rock debris and the like in the well have a certain accumulation thickness and a relatively compact accumulation structure, so the effect of cleaning by using fluid alone is very unsatisfactory and the efficiency is also low.

[0003] Therefore, it is necessary to provide a tool capable of loosening the sediment such as sand, rock debris and the like around the outer fishing neck to be fished before fishing. SUMMARY

[0004] In view of the problems in the prior art, the present application provides a downhole sand sweeping tool.

[0005] The downhole sand sweeping tool provided by the present application comprises:

[0006] A sleeve assembly comprising a positioning sleeve and a rotating sleeve connected to one end of the positioning sleeve, the rotating sleeve movably matches the positioning sleeve in the circumferential direction, and the end of the rotating sleeve is a sand sweeping end;

[0007] A driving mandrel which is arranged in the sleeve assembly and can move axially relative to the sleeve assembly, and one end of the driving mandrel is connected to a pulling steel cable;

[0008] A transmission assembly comprising a helical groove arranged on the outer circumferential surface of the driving mandrel and a transmission member arranged on the inner wall of the rotating sleeve, the transmission member protrudes from the inner wall of the rotating sleeve and is matched into the helical groove.

[0009] In one embodiment, one end of the rotating sleeve has a connecting section with a reduced outer diameter, the connecting section is nested in the end of the positioning sleeve, and a movable connection structure is arranged between the connecting section and the rotating sleeve.

[0010] In one embodiment, the movable connection structure comprises a limiting sliding groove continuously extending in the circumferential direction of the sleeve assembly and a sliding block partially matched into the limiting sliding groove, and the limiting sliding groove is arranged on the outer wall of the connecting section or the inner wall of the end of the positioning sleeve.

[0011] In one embodiment, the sand sweeping end of the rotating sleeve is provided with sand sweeping teeth, and the sand sweeping teeth are continuously distributed along the circumference of the rotating sleeve, so that the sand sweeping end of the rotating sleeve is jagged.

[0012] In one embodiment, the positioning sleeve is provided with a positioning structure, which comprises a plurality of elastic members arranged along the circumference of the outer wall of the positioning sleeve, and the elastic members can abut against the inner wall of the downhole tubing.

[0013] In one embodiment, the elastic members are bow spring pieces, and the two ends of the bow spring pieces are connected to the positioning sleeve, and the middle part between the two ends is an elastic positioning part which protrudes outward relative to the positioning sleeve.

[0014] In one embodiment, the positioning structure further comprises an assembly groove opened on the outer wall of the positioning sleeve, and one end of the groove wall of the assembly groove protrudes a stop block, and the stop block has an assembly gap with the groove bottom of the assembly groove.

[0015] In one embodiment, one end of the bow spring piece is limitedly installed in the assembly gap, and the other end is fixed in the assembly groove.

[0016] In one embodiment, a joint is further fixedly connected to the end of the driving mandrel, and the joint is connected to the pulling cable.

[0017] In one embodiment, the inner diameter of the sand sweeping end of the rotating sleeve is enlarged relative to the part where the transmission member is located, and the end of the driving mandrel has a tapered head part corresponding to the sand sweeping end and having an enlarged diameter.

[0018] In one embodiment, the projection of the tapered head part completely covers the fitting gap between the outer wall of the driving mandrel and the inner wall of the rotating sleeve.

[0019] In one embodiment, the transmission member is a ball, and the inner wall of the rotating sleeve has a positioning groove for positioning the ball, and the ball is partially contained in the positioning groove.

[0020] The above technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present application can be achieved.

[0021] The downhole sand sweeping tool provided by the present application has at least the following beneficial effects compared with the prior art:

[0022] The sand sweeping tool can agitate the deposition and accumulation structure of the sand and rock debris in the well, so that the sand and rock debris are loosened, and the problem of difficult cleaning caused by the deposition and accumulation structure of the sand and rock debris being too compact is solved. After the agitation and cleaning of the tool, the loosened sand and rock debris can be effectively carried out by subsequent fluid, so that the purpose of final complete cleaning is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0023] The application will be described in more detail below based on the embodiments and with reference to the drawings. In the drawings:

[0024] Figure 1 The overall structure schematic diagram of the sand sweeping tool is shown;

[0025] Figure 2 The structure schematic diagram of the driving mandrel of the sand sweeping tool is shown.

[0026] In the drawings, the same components use the same reference numerals. The drawings are not in actual proportion.

[0027] Reference numerals:

[0028] 1-sleeve assembly, 11-positioning sleeve, 12-rotating sleeve, 121-connection section, 122-sand sweeping end, 123-sand sweeping tooth, 2-driving mandrel, 21-conical head, 3-transmission assembly, 31-helical groove, 32-transmission piece, 4-movable connection structure, 41-sliding block, 42-limiting sliding groove, 5-positioning structure, 51-bow spring piece, 52-assembly groove, 521-stop block, 6-joint. DETAILED DESCRIPTION

[0029] The application will be described in more detail below based on the embodiments and with reference to the drawings. In the drawings:

[0030] The embodiment of the application provides a downhole sand sweeping tool, which comprises:

[0031] The sleeve assembly 1 comprises a positioning sleeve 11 and a rotating sleeve 12 connected to one end of the positioning sleeve 11, the rotating sleeve 12 is movably connected to the positioning sleeve 11 in the circumferential direction, and the end of the rotating sleeve 12 is a sand sweeping end 122.

[0032] The driving mandrel 2 is arranged in the sleeve assembly 1 and can move axially relative to the sleeve assembly 1, and one end of the driving mandrel 2 close to the positioning sleeve 11 is connected to the pulling cable.

[0033] The transmission assembly 3 comprises a helical groove 31 arranged on the outer circumferential surface of the driving mandrel 2 and a transmission piece 32 arranged on the inner wall of the rotating sleeve 12, the transmission piece 32 protrudes from the inner wall of the rotating sleeve 12 and is matched to the inside of the helical groove 31.

[0034] Specifically, the drawingsFigure 1 With Figure 2 The sand sweeping tool aims at cleaning the deposited and accumulated sand and debris in the well, mainly loosens the deposited and accumulated structure of the sand and debris by the tool, so as to solve the problem of cleaning difficulty caused by the too tight deposited and accumulated structure of the sand and debris. The pre-cleaning by the tool can facilitate the subsequent output of the loosened sand and debris carried by the fluid, so as to achieve the purpose of final complete cleaning.

[0035] The sand sweeping tool mainly includes four parts, i.e. a positioning sleeve 11 for positioning in the well, a rotating sleeve 12 for directly performing the sand sweeping action, a driving core shaft 2 for outputting power, and a transmission assembly 3 for outputting the power of the driving core shaft 2 to the rotating sleeve 12. The positioning sleeve 11 and the rotating sleeve 12 are connected and matched with each other as the outer cylinder part of the tool, the positioning sleeve 11 has a positioning structure 5 capable of being positioned and matched with the inner wall of the downhole tubing, after the positioning sleeve 11 is positioned, the driving core shaft 2 drives the rotating sleeve 12 to rotate through the transmission assembly 3, the sand sweeping end 122 at the end of the rotating sleeve 12 contacts and stirs the deposited and accumulated structure of the sand and debris, so as to achieve the purpose of loosening and cleaning.

[0036] Further, the power of the driving core shaft 2 is derived from the pulling on the well, after the positioning sleeve 11 is positioned, the driving core shaft 2 is driven to reciprocate along the axial direction by repeatedly pulling the cable, the reciprocating movement of the driving core shaft 2 along the axial direction is converted into the rotation of the rotating sleeve 12 in the circumferential direction through the cooperation of the spiral groove 31 arranged on the surface of the driving core shaft 2 and the transmission member 32 arranged on the inner wall of the rotating sleeve 12, so as to realize the stirring of the deposited and accumulated structure of the sand and debris.

[0037] In one embodiment, the positioning structure 5 includes a plurality of elastic members arranged on the outer wall of the positioning sleeve 11 in the circumferential direction, the elastic members can abut against the inner wall of the downhole tubing. The friction force generated between the elastic members and the inner wall of the downhole tubing realizes the relative fixation of the positioning sleeve 11 with the tubing in the well. The elastic members can adopt various structures, as long as the relative extrusion and abutment between the elastic members and the inner wall of the downhole tubing can be realized, so as to generate the required friction force for positioning.

[0038] Preferably, the elastic member is an arc spring piece 51, the two ends of the arc spring piece 51 are connected to the positioning sleeve 11, and the middle part between the two ends is an elastic positioning part which protrudes outward relative to the positioning sleeve 11.

[0039] Specifically, as shown in the accompanying drawings Figure 1As shown, the elastic member is an arch spring sheet 51, which is an arch-shaped spring sheet with two ends connected to the outer wall of the positioning sleeve 11. The arch spring sheet 51 protrudes from the positioning sleeve 11 as a whole, and the middle position between the two ends is an arc-shaped top end and serves as an elastic positioning part. During positioning, the elastic positioning part abuts against the inner wall of the downhole tubing and deforms, so as to be pressed against each other, thereby generating a certain size of friction force, and the positioning sleeve 11 is relatively fixed to the tubing through the friction force.

[0040] Preferably, the elastic positioning part at the middle position between the two ends of the arch spring sheet 51 has a straight line segment with a planar outer surface, which is capable of being in surface contact with the inner wall of the tubing, so as to increase the friction force by increasing the contact area.

[0041] In one embodiment, the positioning structure 5 further comprises an assembly groove 52 provided on the outer wall of the positioning sleeve 11, and one end of the assembly groove 52 has a stop block 521 protruding from the groove wall, and the stop block 521 and the groove bottom of the assembly groove 52 have an assembly gap therebetween.

[0042] In one embodiment, the positioning structure 5 further comprises an assembly groove 52 provided on the outer wall of the positioning sleeve 11, and one end of the assembly groove 52 has a stop block 521 protruding from the groove wall, and the stop block 521 and the groove bottom of the assembly groove 52 have an assembly gap therebetween.

[0043] Specifically, as shown in the drawings, Figure 1 the arch spring sheet 51 is assembled in the assembly groove 52 on the outer wall of the positioning sleeve 11. Specifically, one end of the arch spring sheet 51 is fixed to the groove bottom (or the groove wall) of the assembly groove 52 by a fastener, and the other end of the arch spring sheet 51 is limitingly installed in the assembly gap between the stop block 521 and the groove bottom of the assembly groove 52. Based on the deformation of the arch spring sheet 51, when it deforms, the height of the arch spring sheet 51 protruding from the positioning sleeve 11 will change, and this change will be reflected in the movement of the end of the arch spring sheet 51; thus, one end of the arch spring sheet 51 is fixed, and the other end is limited in the assembly gap and can move a certain distance in the assembly gap, thereby providing space for the deformation of the arch spring sheet 51.

[0044] In one embodiment, the positioning structure 5 further comprises a deformation control member provided on the positioning sleeve 11, and the position of the deformation control member corresponds to the elastic positioning part of the arch spring sheet 51. The deformation control member can cause the arch spring sheet 51 to deform to a certain extent in the direction of radially inward, so as to reduce the height of the elastic positioning part protruding.

[0045] Specifically, when the tool is running downhole, the deformation control member can be used to cause the arch spring sheet 51 to deform to a certain extent in the direction of radially inward, so as to reduce the height of the elastic positioning part protruding. In this way, the arch spring sheet 51 can avoid contacting the inner wall of the tubing or reduce the friction force of the contact part, so as to avoid generating a friction force or a too large friction force to affect the normal movement of the tool in the downhole tubing when the tool has not reached the target position.

[0046] Further, the deformation control member can adopt various structures. For example, an electromagnet with a certain magnetic attraction range can be adopted, the electromagnet is arranged in the assembly groove 52, and the magnetic force of the electromagnet when turned on is used to attract the bow spring piece 51 to make the bow spring piece 51 produce a certain degree of deformation in the direction of the radial inward. The deformation control member can also adopt a steel wire traction structure, the traction steel wire is arranged in the axial direction and passes through the positioning sleeve 11, passes through the traction hole arranged on the groove bottom of the assembly groove 52, and then passes out in the radial direction and is connected (bound) to the elastic positioning part (a binding lug is arranged on the inner wall) of the bow spring piece 51, so that the traction force can be applied to the traction steel wire on the well, and the bow spring piece 51 can also produce a certain degree of deformation in the direction of the radial inward.

[0047] In an embodiment, one end of the rotating sleeve 12 has a connecting section 121 with a reduced outer diameter, the connecting section 121 is nested in the end of the positioning sleeve 11, and the connecting section 121 and the rotating sleeve 12 are provided with the movable connection structure 4.

[0048] Specifically, as shown in the drawings, Figure 1 the rotating sleeve 12 is nested and connected with the end of the positioning sleeve 11 by the connecting section 121, and the rotating sleeve 12 itself has the same outer diameter as the positioning sleeve 11. In this way, the consistency of the outer dimensions of the tool composed of the rotating sleeve 12 and the positioning sleeve 11 can be ensured, so that the tool can be easily moved in the oil pipe downhole, and the inconsistency of the outer dimensions can avoid the obstruction between part of the structure and the oil pipe.

[0049] In an embodiment, the movable connection structure 4 includes a limiting sliding groove 42 extending continuously in the circumferential direction of the sleeve assembly 1 and a sliding block 41 partially fitted into the limiting sliding groove 42, and the limiting sliding groove 42 is arranged on the outer wall of the connecting section 121 or the inner wall of the end of the positioning sleeve 11.

[0050] Specifically, the rotating sleeve 12 and the positioning sleeve 11 are relatively fixed in the axial direction and relatively movable in the circumferential direction by the movable connection structure 4, the sliding block 41 of the movable connection structure 4 is limited in the inside of the limiting sliding groove 42 and can slide in the circumferential direction along the limiting sliding groove 42, so that the relative fixation and relative movement in the two directions are respectively realized. The limiting sliding groove 42 can be arranged on the outer wall of the connecting section 121 or the inner wall of the end of the positioning sleeve 11, and correspondingly, the sliding block 41 can also be arranged on the outer wall of the connecting section 121 or the inner wall of the end of the positioning sleeve 11, and the limiting sliding groove 42 and the sliding block 41 are respectively arranged on the two wall surfaces mentioned above. The movable connection structure 4 can be arranged in multiple in the axial direction, and in the embodiment, two movable connection structures 4 are arranged. Figure 1

[0051] ​In one embodiment, the sand sweeping end 122 of the rotating sleeve 12 is provided with sand sweeping teeth 123, and the sand sweeping teeth 123 are continuously distributed along the circumference of the rotating sleeve 12, so that the sand sweeping end 122 of the rotating sleeve 12 is jagged.

[0052] Specifically, as shown in the drawings Figure 1 The sand sweeping end of the rotating sleeve is jagged by the sand sweeping teeth, so that the tips of the sand sweeping teeth can better penetrate the deposition and accumulation structure of the sand and debris underground, thereby realizing continuous "excavation" and fully exerting the loosening effect on the deposition and accumulation structure of the sand and debris.

[0053] In one embodiment, a joint 6 is further included, which is fixedly connected to the end of the driving mandrel 2 and the two are threadedly connected, and the joint 6 is connected to the pulling cable.

[0054] Specifically, the size of the joint 6 is greater than the inner diameter of the end of the fixed sleeve, so that the joint 6 can abut against the end face of the fixed sleeve, further serving as the stroke end point (stroke end point of downward movement) of one end of the driving mandrel 2 moving in the axial direction, and the stroke end point of the other end is determined by the arrangement of the outer diameter of the driving mandrel 2 and the inner diameter of the sleeve.

[0055] It should be noted that the stroke of the driving mandrel 2 can actually be limited in the transmission assembly 3, that is, the helical groove 31 is not provided as a through groove (both ends are closed), so that the transmission member 32 is blocked when it moves relatively to the end of the helical groove 31, thereby limiting the stroke end point, so that the joint 6 here can serve as a further stroke end point, avoiding the transmission member 32 from moving relatively to the end of the helical groove 31 or avoiding the transmission member 32 from generating impact when moving relatively to the end of the helical groove 31 and affecting the structure.

[0056] In one embodiment, the inner diameter of the sand sweeping end 122 of the rotating sleeve 12 is enlarged relative to the part where the transmission member 32 is located, and the end of the driving mandrel 2 has a tapered head 21 corresponding to the inside of the sand sweeping end 122 and having an enlarged diameter;

[0057] Among them, the projection of the tapered head 21 completely covers the fitting gap between the outer wall of the driving mandrel 2 and the inner wall of the rotating sleeve 12.

[0058] Specifically, as shown in the drawings Figure 1As shown, the end of the driving mandrel 2 has a tapered head 21 which is located in the sand sweeping end 122 with enlarged inner diameter, and the projection of the tapered head 21 in the plane where the cross section of the rotating sleeve 12 lies completely covers the fitting gap between the outer wall of the driving mandrel 2 and the inner wall of the rotating sleeve 12, and the purposes of this are three: firstly, the head is set as tapered, which is beneficial to the "digging" of the sand sweeping tool relative to the accumulation structure of sand and gravel; secondly, the tapered head 21 can shield the fitting gap to some extent, avoiding the direct entry of sand and gravel under the well into the fitting gap to cause the relative jamming of the driving mandrel 2 and the rotating sleeve 12; thirdly, the size of the tapered head 21 is larger than the inner diameter of the main body of the rotating sleeve 12, so that the tapered head 21 can abut on the transition platform between the part where the transmission member 32 of the rotating sleeve 12 is located and the part of the sand sweeping end 122, thereby constituting the stroke end point of the other end of the axial movement of the driving mandrel 2, and the effect is similar to that of the stroke end point constituted by the part of the joint 6.

[0059] In one embodiment, the transmission member 32 adopts a ball, and the inner wall of the rotating sleeve 12 has a positioning groove for positioning the ball, and the ball is partially accommodated in the positioning groove.

[0060] Specifically, the transmission member 32 adopts a ball, which can convert the sliding friction in the transmission assembly 3 into rolling friction, thereby reducing the friction assembly and avoiding the transitional wear of the contact surface. Similarly, the slider 41 of the movable connection structure 4 can also adopt the same ball structure to achieve the same technical effect.

[0061] In the description of the present application, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0062] Although the present application is described herein with reference to particular embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present application. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed, without departing from the spirit and scope of the present application as defined in the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from the original claims. It should also be understood that features described in connection with a single embodiment can be used in other described embodiments.

Claims

1. A downhole sand-sweeping tool, characterized in that, include: A sleeve assembly includes a positioning sleeve and a rotating sleeve connected to one end of the positioning sleeve. The rotating sleeve is movably engaged with the positioning sleeve in the circumferential direction, and the end of the rotating sleeve is a sand-sweeping end. The positioning sleeve can be positioned with the inner wall of the downhole tubing. A drive spindle is inserted inside the sleeve assembly and is axially movable relative to the sleeve assembly. The end of the drive spindle near the positioning sleeve is connected to a pull cable. A transmission assembly includes a helical groove disposed on the outer peripheral surface of the drive spindle and a transmission component disposed on the inner wall of the rotating sleeve, the transmission component protruding from the inner wall of the rotating sleeve and fitting into the helical groove. The inner diameter of the sand-sweeping end of the rotating sleeve is enlarged relative to the part where the transmission component is located, and the end of the drive spindle has a tapered head corresponding to the sand-sweeping end and with an enlarged diameter. The projection of the conical head completely covers the mating gap between the outer wall of the drive spindle and the inner wall of the rotating sleeve. One end of the rotating sleeve has a connecting section with a reduced outer diameter. The connecting section is nested into the end of the positioning sleeve, and a movable connecting structure is provided between the connecting section and the rotating sleeve. The positioning sleeve is provided with a positioning structure, which includes a plurality of elastic elements arranged circumferentially on the outer wall of the positioning sleeve, and the elastic elements can abut against the inner wall of the downhole tubing.

2. The downhole sand-sweeping tool according to claim 1, characterized in that, The movable connection structure includes a limiting groove that extends continuously along the circumference of the sleeve assembly and a slider that partially engages with the limiting groove. The limiting groove is disposed on the outer wall of the connecting section or the inner wall of the end of the positioning sleeve.

3. The downhole sand-sweeping tool according to claim 1, characterized in that, The rotating sleeve has sand-sweeping teeth at its sand-sweeping end, and multiple sand-sweeping teeth are continuously distributed along the circumference of the rotating sleeve so that the sand-sweeping end of the rotating sleeve is serrated.

4. The downhole sand-sweeping tool according to claim 1, characterized in that, The elastic element is a bow spring, with both ends of the bow spring connected to the positioning sleeve, and the middle part between the two ends is an elastic positioning part that protrudes outward relative to the positioning sleeve.

5. The downhole sand-sweeping tool according to claim 4, characterized in that, The positioning structure also includes an assembly groove formed on the outer wall of the positioning sleeve, with a stop protruding from one end of the groove wall, and an assembly gap between the stop and the bottom of the groove. One end of the bow spring is limited and installed in the assembly gap, and the other end is fixed in the assembly groove.

6. The downhole sand-sweeping tool according to any one of claims 1 to 5, characterized in that, It also includes a connector, which is fixedly connected to the end of the drive spindle and connected to the pull cable.

7. The downhole sand-sweeping tool according to any one of claims 1 to 5, characterized in that, The transmission component uses ball bearings, and the inner wall of the rotating sleeve has a positioning groove for positioning the ball bearings, which are partially accommodated in the positioning groove.

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