Directional long drill hole damaged part recovery device based on deep coal seam composite roof

Abstract

The utility model discloses a directional long drill hole damaged part recovery device based on a deep coal seam composite roof, and belongs to the technical field of coal mine safety mining. The recovery device takes a supporting steel column as an axis, a drill rod joint is arranged at the top of the supporting steel column, and an outer sleeve is integrally sleeved outside the supporting steel column; the supporting steel column comprises a large-diameter part and a small-diameter part from top to bottom, the small-diameter part is sleeved with a spring, a base ferrule is arranged on the upper portion of the large-diameter part, the top of the outer sleeve is connected with the supporting steel column through the base ferrule, a pin groove is formed in the lower portion of the large-diameter part, and a shear pin penetrates through the pin groove. The upper part of a sliding sleeve surrounding the spring is fixed on the lower part of the large-diameter part through a shear pin; the bottom of the small-diameter part of the supporting steel column is connected with the top of the gripper; the bottom of the sliding sleeve is connected with the top of a gripper closing sleeve, the supporting steel column is sleeved with the gripper closing sleeve, and the lower portion of the gripper closing sleeve wraps the top of the gripper. The technical scheme is used for recovering damaged parts in the hydraulic fracturing or drilling process, the damaged parts can be grabbed in time when the drill rod is damaged, and residual original parts are extracted out so as not to influence the construction progress.

Description

Technical Field

[0001] The utility model belongs to the technical field of safe mining of coal mines, and designs a device for recovering damaged parts of directional long drilling holes based on a deep coal seam composite roof. Background Art

[0002] Directional drilling and open-hole staged fracturing is used for hydraulic fracturing. The principle is to use packers to create a sealed volume within the hole. By injecting fracturing fluid at high flow rates and high pressures, the pressure within the hole gradually increases. This creates a weakened fracture system around the sealed volume within the hole, primarily composed of high-pressure fractures, supplemented by secondary extensions and natural fractures that connect fractures and fracture joints, thereby resolving the stress conduction problem in the roof.

[0003] The construction of hydraulic fracturing includes two parts: drilling rig construction and fracturing construction. First, the rig drills the hole, and then the fracturing is carried out through the hole. The overall process can be summarized as follows:

[0004] (1) First, a ZYL-15000D crawler-type fully hydraulic directional drilling rig was used to construct long-distance directional drilling towards the key layers above the roof;

[0005] (2) After the construction is completed, continue to use the ZYL-15000D crawler-type fully hydraulic directional drilling rig to connect the fracturing components such as the guide, check valve, packer, choke, and fracturing string in sequence and push them to the bottom of the hole;

[0006] (3) Then start the remote hydraulic fracturing pump group and perform segmented large-flow backward segmented hydraulic fracturing. After fracturing once, withdraw the equipment 10m and perform fracturing again. This process is repeated until the entire borehole is fractured. The time for each fracturing is based on the actual pressure drop time.

[0007] (4) After fracturing, a large number of composite cracks exist inside the key rock layer, preventing the stress transmission of the roof.

[0008] As resource extraction gradually shifts to medium- and deep-seated formations, both drilling and hydraulic fracturing require extensive use of drill pipe. As mentioned above, the hydraulic fracturing process requires frequent movement of the drill pipe. However, under complex geostress conditions and the complex working conditions at the construction site, the drill pipe may yield or fatigue during advancement due to structural reasons, environmental factors, or assembly issues, making it impossible to directly recover it. Salvaging damaged components is unavoidable. In this case, a recovery device is needed to re-secure the damaged component and then remove it along the drill pipe. Utility Model Content

[0009] In order to achieve the above objectives, the technical solution of the utility model provides a directional long drilling damaged component recovery device based on the deep coal seam composite roof, which is used to recover damaged components during hydraulic fracturing or drilling. When the drill rod is damaged, the damaged part can be grasped in time and the remaining original parts can be extracted to avoid affecting the construction progress.

[0010] The utility model is realized through the following technical solutions:

[0011] A device for recovering damaged parts from directional long drilling based on a deep coal seam composite roof, wherein the device is centered on a supporting steel column, the top of the supporting steel column is provided with a drill pipe joint, and the outside is entirely covered with an outer sleeve;

[0012] The support steel column comprises a large diameter portion and a small diameter portion from top to bottom, a spring is sleeved on the outside of the small diameter portion, a base ring is provided on the upper portion of the large diameter portion, the top of the outer sleeve is connected to the support steel column through the base ring, a pin groove is provided on the lower portion of the large diameter portion, a shear pin is passed through the pin groove, and the upper portion of the sliding sleeve surrounding the spring is fixed to the lower portion of the large diameter portion through the shear pin;

[0013] The bottom of the small diameter portion of the supporting steel column is connected to the top of the gripper;

[0014] The bottom of the sliding sleeve is connected to the top of the gripper closing sleeve. The gripper closing sleeve is sleeved on the outside of the supporting steel column, and the lower part of the gripper closing sleeve wraps the top of the gripper.

[0015] Furthermore, the top of the supporting steel column has an external thread that cooperates with the internal thread inside the drill pipe joint.

[0016] Furthermore, the gripper is fixed to the bottom of the small diameter portion of the supporting steel column through a gripper washer.

[0017] Furthermore, the gripper is a tubular structure, comprising a support portion and a plurality of elongated gripping portions, wherein the gripping portions extend vertically and equidistantly from the edge of the support portion surface, so that a cylindrical space is formed inside the plurality of gripping portions.

[0018] Furthermore, a plurality of groups of barbed gripping contacts are provided on the inner surface of the gripping portion, and the protruding directions of the gripping contacts are toward the supporting portion.

[0019] Furthermore, the shear pin includes a pin groove in a portion inside the large diameter portion of the support steel column.

[0020] Furthermore, the directional long drilling damaged parts recovery device also includes a shearing mechanism, which is arranged inside the supporting steel column and includes a shearing head, a connecting rod and a top plate from top to bottom.

[0021] The shearing head is located at the lower part of the shearing pin, and its position corresponds to the pin groove; the top end of the connecting rod is fixed to the bottom of the shearing head, and the bottom end of the connecting rod passes through the supporting steel column and extends into the upper part of the gripper, and is connected to the top plate at the bottom; the top plate rests on the raised part on the inner side of the upper part of the gripper.

[0022] Furthermore, the top plate has a central hole, and an internal thread is provided in the central hole to cooperate with the external thread provided at the bottom end of the connecting rod.

[0023] Furthermore, a spring slot is provided between the large diameter portion and the small diameter portion of the support steel column, and the top of the spring rests against the spring slot.

[0024] Furthermore, a spring clamp is provided on the upper portion of the gripper closing sleeve adjacent to the supporting steel column, and the bottom of the spring rests on the spring clamp to keep the spring in a compressed state.

[0025] Furthermore, the length of the spring in the compressed state is half of the small diameter portion of the supporting steel column.

[0026] Here, since the bottom of the sliding sleeve is connected to the top of the gripper closing sleeve, the bottom of the spring in the compressed state is at the same height as the bottom of the sliding sleeve.

[0027] Furthermore, the drill pipe joint and the supporting steel column are manufactured as an integral structure.

[0028] Furthermore, an external thread is provided on the upper portion of the large diameter portion of the supporting steel column, which cooperates with the internal thread of the base ring.

[0029] Furthermore, a plurality of bolt holes are respectively provided at corresponding positions of the base ring and the top of the outer sleeve, through which fixing bolts can be passed to fix the two together.

[0030] Furthermore, a plurality of bolt holes are respectively provided at corresponding positions of the bottom of the sliding sleeve and the top of the gripper closing sleeve, through which fixing bolts can be passed to fix the two together.

[0031] Furthermore, a plurality of bolt holes are respectively provided at corresponding positions of the bottom of the small diameter portion of the supporting steel column and the top of the grip, through which fixing bolts can be passed to fix the two together.

[0032] Beneficial effects of the utility model:

[0033] The technical solution of the utility model can achieve the technical effect of fixing the damaged drill rod and then recovering it through the structure of the tough gripper grabbing and the rigid sleeve locking, and has the advantages of simple structure, easy operation and secondary recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0035] Figure 1 It is a structural schematic diagram according to an embodiment of the present invention; the left half is drawn using the half-section method as the appearance of the outer sleeve (13), the right half is the structural section detail, and the lower half of the (3) supporting steel column is drawn using the partial section method.

[0036] Figure 2 2 is a structural diagram of a shearing mechanism according to an embodiment of the present utility model.

[0037] Figure 3 The detailed structure diagram of the gripper according to the embodiment of the present invention; due to the axial symmetry of the structure, the front view and side view are drawn. Figure 1 The end of the gripper is partially cut away to show the location of the gripper synapse.

[0038] Figure 4 This is a detailed structural diagram of the gripper synapse according to an embodiment of the present utility model.

[0039] Among them, 1-drill pipe joint; 2-base ring; 3-support steel column; 4-shear pin; 5-spring; 6-sliding sleeve; 7-grip closing sleeve; 8-grip washer; 9-grip; 10-outer sleeve; 11-grip synapse; 12-pin groove; 13-shear head; 14-top plate; 15-connecting rod.

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] Exemplary embodiments are described in detail herein, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with certain aspects of the present disclosure.

[0042] The terms "first," "second," and the like in the description of the present disclosure are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present disclosure described herein can, for example, be implemented in an order other than those illustrated or described herein.

[0043] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0044] Multiple includes two or more.

[0045] It should be understood that the term "and / or" used in this disclosure simply describes the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. This reduces manpower input and facilitates business automation, offering universal, efficient, and high-precision features.

[0046] Example

[0047] The utility model provides a device for recovering damaged parts of directional long drilling based on deep coal seam composite roof. Figure 1 As shown, it includes the following parts: a drill pipe joint 1, a base ring 2, a support steel column 3, a shear pin 4, a spring 5, a sliding sleeve 6, a gripper closing sleeve 7, a gripper washer 8, a gripper 9, and an outer sleeve 10.

[0048] The main structure of the directional long-hole damaged component recovery device is centered on a support steel column 3. The top of the support steel column 3 is a drill pipe joint 1 for connecting the drill pipe. Specifically, the top of the support steel column 3 has an external thread that mates with the internal thread inside the drill pipe joint 1. The diameter of the small portion of the support steel column is slightly larger than the remaining portion (for mounting a spring). The top of this large-diameter portion has a base ring 2, through which the top of the outer sleeve 10 is connected to the main structure. The lower end of this large-diameter portion has a pin groove, where the shear pin 4 is located. The top of the sliding sleeve 6 is also fixed to the shear pin 4.

[0049] The small diameter part of the support steel column is covered with a spring 5, which can be compressed to about half the length of the small diameter part, that is, the length of the sliding sleeve 6. The lower part of the sliding sleeve 6 is connected with a gripper closing sleeve 7, and both sleeves are sleeved outside the support steel column 3.

[0050] The lower end of the supporting steel column 3 is connected to the gripper 9, and a small part of the bottom of the gripper closing sleeve 7 is wrapped around the top of the gripper 9 at the beginning.

[0051] The gripper 9 is a tubular structure, comprising a support portion and a plurality of long strip gripping portions, the gripping portions extending perpendicularly from the edge of the support portion at equal intervals, so that a cylindrical space is formed inside the plurality of gripping portions. A plurality of groups of barbed gripping synapses 11 are provided on the inner surface of the gripping portion, such as Figure 3-4 As shown, the protrusion direction of the gripper synapse 11 is toward the support portion. Since the structure is a barb-shaped structure, the synapse 11 has a certain deformation ability and toughness, so that the damaged drill rod is almost not hindered when entering and is hooked and fixed when being pushed out.

[0052] The drill pipe joint 1 and the support steel column 3 are manufactured as one piece. The support steel column below the drill pipe joint has threads that allow the base ring 2 to be tightened. There are four holes along the circumference between the base ring 2 and the outer sleeve 10, which can be connected by bolts. The support steel column 3 and the sliding sleeve 6 are connected by shear pins. Below the shear pin 4, the diameter of the support steel column 3 is reduced and grooves (spring slots) are engraved to ensure the installation of the spring 5. The sliding sleeve 6 and the gripper closing sleeve 7 have six corresponding circular holes along the circumference and are connected by bolts. The gripper closing sleeve 7 is provided with a protrusion (spring clip) adjacent to the support steel column to facilitate the installation and fixation of the spring. Four threaded screws are evenly distributed along the axis at the bottom of the support steel column 3, and the gripper 9 is connected to the nut and the bottom of the support steel column 3 through a flange-shaped gripper washer 8.

[0053] The directional long drilling damaged parts recovery device also includes a shearing mechanism, such as Figure 2 As shown, the shearing mechanism is located within the support steel column and comprises, from top to bottom, a shearing head 13, a connecting rod (or connecting steel column) 15, and a top plate 14. The shearing head is located below the shear pin, corresponding to the pin groove 12. The top end of the connecting rod is fixed to the bottom of the shearing head 13, while the bottom end of the connecting rod passes through the support steel column and extends into the upper part of the gripper, where it connects to the top plate 14 at the bottom. The top plate 14 rests on a raised portion on the inner side of the upper part of the gripper. Specifically, the top plate 14 has a central hole with an internal thread that mates with the external thread at the bottom end of the connecting rod 15.

[0054] During use, the device's initial state is taut with spring 5 restrained by sliding sleeve 6 and shear pin 4. When the damaged drill pipe needs to be salvaged, it is connected to the drill pipe using drill pipe joint 1 and delivered to the damaged area. The drill pipe is slowly advanced until the damaged component is at least two-thirds of the way inside gripper 9. At this point, due to the shear mechanism within support steel column 3, when gripper 9 encounters the damaged component, it pushes top plate 14. Driven by the intermediate connecting rod, shear head 13 moves toward pin groove 12, shearing shear pin 4 and ejecting spring 5. Spring 5 then pushes gripper closing sleeve 7 forward and locks the gripper. This activates the drill pipe retraction mechanism. Because the gripper's gripping portion contains gripper synapse 11, constrained by gripper closing sleeve 7, the synapse firmly grips the threads of the grooved steel pipe, preventing the damaged component from falling out until it is pulled out of the drill hole.

[0055] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which are all within the protection of the present invention.

Claims

1. A device for recovering damaged parts from directional long drilling of deep coal seam composite roof, characterized in that: The directional long drilling damaged parts recovery device takes the supporting steel column as the axis, the top of the supporting steel column is provided with a drill rod joint, and the outside is integrally covered with an outer sleeve; The support steel column comprises a large diameter portion and a small diameter portion from top to bottom, a spring is sleeved on the outside of the small diameter portion, a base ring is provided on the upper portion of the large diameter portion, the top of the outer sleeve is connected to the support steel column through the base ring, a pin groove is provided on the lower portion of the large diameter portion, a shear pin is passed through the pin groove, and the upper portion of the sliding sleeve surrounding the spring is fixed to the lower portion of the large diameter portion through the shear pin; The bottom of the small diameter portion of the supporting steel column is connected to the top of the gripper; The bottom of the sliding sleeve is connected to the top of the gripper closing sleeve. The gripper closing sleeve is sleeved on the outside of the supporting steel column, and the lower part of the gripper closing sleeve wraps the top of the gripper.

2. The device for recovering damaged parts of directional long drilling according to claim 1, characterized in that: The gripper is fixed to the bottom of the small diameter portion of the supporting steel column through a gripper washer.

3. The device for recovering damaged parts of directional long drilling according to claim 1, characterized in that: The gripper is a tubular structure, comprising a support portion and a plurality of elongated gripping portions, wherein the gripping portions extend perpendicularly from the edge of the support portion at equal intervals, so that a cylindrical space is formed inside the plurality of gripping portions.

4. The device for recovering damaged parts of directional long drilling according to claim 3, characterized in that: A plurality of groups of barbed gripping synapses are provided on the inner surface of the gripping portion, and the protruding directions of the gripping synapses are toward the supporting portion.

5. The device for recovering damaged parts of directional long drilling according to claim 1, characterized in that: The shear pin includes a pin notch in a portion inside the large diameter portion of the support steel column.

6. The device for recovering damaged parts from directional long drilling according to claim 5, characterized in that: The directional long drilling damaged parts recovery device also includes a shearing mechanism, which is arranged inside the supporting steel column and includes a shearing head, a connecting rod and a top plate from top to bottom. The shearing head is located at the lower part of the shearing pin, and its position corresponds to the pin groove; the top end of the connecting rod is fixed to the bottom of the shearing head, and the bottom end of the connecting rod passes through the supporting steel column and extends into the upper part of the gripper, and is connected to the top plate at the bottom; the top plate rests on the raised part on the inner side of the upper part of the gripper.

7. The device for recovering damaged parts from directional long drilling according to claim 1, characterized in that: A spring slot is provided between the large diameter portion and the small diameter portion of the support steel column, and the top of the spring rests against the spring slot.

8. The device for recovering damaged parts from directional long drilling according to claim 1, characterized in that: A spring clamping plate is provided on the upper portion of the gripper closing sleeve adjacent to the supporting steel column, and the bottom of the spring rests against the spring clamping plate to keep the spring in a compressed state.

9. The device for recovering damaged parts from directional long drilling according to claim 1, characterized in that: The upper portion of the large diameter portion of the support steel column is provided with an external thread which cooperates with the internal thread of the base ring.

10. The device for recovering damaged parts during directional long drilling according to claim 1, characterized in that: A plurality of bolt holes are respectively provided at corresponding positions on the top of the base ring and the top of the outer sleeve, and fixing bolts can be passed through the holes to fix the two together; A plurality of bolt holes are respectively provided at corresponding positions on the bottom of the sliding sleeve and the top of the gripper closing sleeve, through which fixing bolts can be passed to fix the two together; A plurality of bolt holes are respectively provided at corresponding positions of the bottom of the small diameter portion of the supporting steel column and the top of the grip, through which fixing bolts can be passed to fix the two together.

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