Drilling tool for sediment and slag salvaging in small-caliber medium-length hole

Abstract

The utility model discloses a drilling tool for sediment and slag salvaging in a small-caliber medium-length hole. The drilling tool comprises an outer pipe, an inner pipe, a drill bit and a connector. The device is used for handling hole crossing accidents of large particles in small-caliber medium-length holes, operation is easy, the device can be operated by being connected with a drill rod, and slag is dredged in a rotating and up-down moving mode in the operation process; the inner and outer pipe type slag salvaging drilling tool adopts the structural design of the inner and outer pipe type slag salvaging drilling tool, flushing fluid is fed into the bottom of a hole through the inner pipe, sediment particles are broken, become small and return upwards to enter a clearance space between the outer pipe and the inner pipe from the opening, slag salvaging operation is completed by lifting the drilling tool, the slag salvaging amount is large, the effect is remarkable, safe slag salvaging is achieved, and the stability of the hole wall is effectively ensured; according to the utility model, the inner and outer tube structural design is adopted, and flushing fluid can be normally introduced into the inner tube; the device is simple in structure, detachable and very convenient to use and maintain.

Description

Technical Field

[0001] The utility model belongs to the technical field of drilling sediment slag scooping tools, and in particular relates to a drilling tool for scooping sediment slag in a small-caliber medium-depth hole. Background Art

[0002] The depth of shale gas survey wells is between 1200m and 1900m, which is a small-diameter medium-deep hole. Sometimes formation gas will escape during drilling construction because when the borehole is drilled to the gas-bearing layer, the formation gas escapes from the formation cracks. At this time, the upward flushing fluid contains bubbles. With the release of formation gas, unstable and complex formations are prone to collapse accidents under the action of formation gas. Particles of different sizes appear in the hole where the collapse accident occurs, and the construction is often accompanied by the phenomenon of drill jamming, which is very likely to cause drill jamming and drill burial accidents.

[0003] When dealing with hole collapse accidents, the common small-diameter slag drills in the prior art include pumpless drills, slag buckets, and long powder tube slag drills. However, in the process of using the prior art slag drills, it was found that although the slag buckets and long powder tube slag drills had poor slag retrieval effects and were difficult to salvage when dealing with accidents, they did not aggravate the collapse of the hole wall. When the pumpless drills dealt with accidents in the hole, the suction effect of the pumpless drills aggravated the collapse of the hole wall, increased the abnormal slag in the hole, and increased the difficulty of dealing with the accident. Therefore, it is very necessary to develop a small-diameter medium-deep hole sediment slag retrieval drill with good slag retrieval effects and safe salvage. Utility Model Content

[0004] In order to solve the technical problem of deep drilling collapse, the utility model aims to provide a sediment recovery drill tool for small-diameter medium-deep holes, so as to achieve the technical effect of safely recovering sediment from small-diameter medium-deep holes.

[0005] The purpose of the utility model is achieved in this way, including an outer tube, an inner tube, a drill bit, and a joint. The inner tube is located inside the outer tube, and there is a gap space between the outer tube and the inner tube. A water hole is provided in the center of the joint and runs through it from top to bottom. The upper end of the joint is connected to the drill rod through a thread. A male thread is provided on the outer side of the lower end of the joint, and is connected to the female thread inside the upper end of the outer tube through the male thread. A female thread is provided on the inner side of the lower end of the joint, and is connected to the male thread outside the upper end of the inner tube through the female thread. The joint closes the upper end of the gap space. A water hole is provided in the center of the drill bit and runs through it from top to bottom. A male thread is provided on the outer side of the upper end of the drill bit, and is connected to the female thread inside the lower end of the outer tube through the male thread. A male thread is provided on the outer side of the lower end of the inner tube, and is connected to the female thread in the water hole of the drill bit through the male thread. The drill bit closes the lower end of the gap space. Openings are symmetrically opened on the upper part of the outer tube.

[0006] Preferably, the drill bit is a composite drill bit, which is usually provided with a steel body to increase the strength of the drill bit and can be manufactured according to drilling requirements.

[0007] Preferably, the joint is a single-tube reducer.

[0008] Preferably, the distance between the opening and the joint is 15 cm.

[0009] Preferably, the opening is 10 cm long and 1.2 cm wide.

[0010] The beneficial effects of the utility model are as follows: the utility model is used to deal with cross-hole accidents of large particles in small-diameter medium-deep holes. The operation is simple and can be operated by connecting the drill rod. During the operation, the slag is removed by rotating and moving up and down. The utility model adopts an inner and outer tube type slag removal drill tool structure design. The flushing liquid is sent to the bottom of the hole through the inner tube. The sediment particles are broken and become smaller and return from the opening to enter the gap space between the outer tube and the inner tube. The drill tool of the utility model is lifted to complete the slag removal operation. The slag removal amount is large and the effect is significant. Safe slag removal is achieved and the stability of the hole wall is effectively ensured. The utility model adopts an inner and outer tube structure design, and the flushing liquid can be normally passed into the inner tube. The utility model has a simple structure and is detachable, and is very convenient to use and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 It is a schematic diagram of the structure of the inner tube;

[0013] Figure 3 It is a schematic diagram of the structure of the gap space between the outer tube and the inner tube;

[0014] Figure 4 is a schematic diagram of the structure of the joint;

[0015] Figure 5 It is a structural schematic diagram of the water hole in the joint;

[0016] Figure 6 is a structural schematic diagram of a drill bit;

[0017] Figure 7 It is a structural schematic diagram of the water hole in the drill bit;

[0018] In the figure: 1-outer tube, 2-inner tube, 3-drill bit, 4-joint, 5-opening, 6-water eye, 7-water hole. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or substitutions made based on the teachings of the present invention belong to the protection scope of the present invention.

[0020] Example 1

[0021] As attached Figure 1~Attached Figure 7 The embodiment of the present invention shows a small-diameter medium-deep hole sediment slag dredging drill tool, comprising an outer tube 1, an inner tube 2, a drill bit 3, and a joint 4. The inner tube 2 is located inside the outer tube 1, and there is a gap space between the outer tube 1 and the inner tube 2. The center of the joint 4 is provided with a water hole 6 that passes through from top to bottom. The upper end of the joint 4 is connected to the drill rod through a thread. The outer side of the lower end of the joint 4 is provided with a male thread, and is connected to the female thread inside the upper end of the outer tube 1 through the male thread. The inner side of the lower end of the joint 4 is provided with a female thread, and is connected to the male thread outside the upper end of the inner tube 2 through the female thread. The joint 4 sets the gap space on the The ends are closed, a water hole 7 is provided in the center of the drill bit 3 which runs through from top to bottom, a male thread is provided on the outer side of the upper end of the drill bit 3, and is connected to the female thread inside the lower end of the outer tube 1 through the male thread, a male thread is provided on the outer side of the lower end of the inner tube 2, and is connected to the female thread in the water hole 7 of the drill bit 3 through the male thread, the drill bit 3 closes the lower end of the gap space, and an opening 5 is symmetrically opened on the upper part of the outer tube 1; wherein the joint 4 is a single-tube reducer, the drill bit 3 is a composite drill bit, the opening 5 is 15 cm away from the joint 4, the opening 5 is 10 cm long and 1.2 cm wide;

[0022] A shale gas investigation well collapse accident occurred, the hole depth 1680m ~ 1723m, belonging to a small diameter medium-depth hole; connected to the Φ50 drill rod, the use of the present embodiment of the slag dredging drill for sediment slag dredging work, slag dredging process shown in Table 1;

[0023] Table 1 Slag removal process record

[0024]

[0025] After implementation, the sediment and particles within 1.5~1.6m in the hole can be retrieved each time, and the slag retrieval drill bit is filled each time. After multiple retrieval operations, the sediment in the hole is finally retrieved cleanly. The slag retrieval process is safe and accident-free, the hole wall is stable, and the slag retrieval effect is significant.

[0026] The working principle and working process of the utility model are as follows: the joint 4 is connected to the drill pipe, and after the slag dredging drill tool is lowered into the hole, the active drill pipe is connected, and the mud pump pumps the flushing liquid from the mud pool into the high-pressure water pipe, enters the active drill pipe and the water holes inside the drill pipe, enters the inner pipe 2 through the water holes 6 of the joint 4, and then reaches the bottom of the hole through the water holes 7 of the drill bit 3, and the flushing liquid returns to the ground from the gap between the outer pipe 1 and the hole wall, and returns to the mud pool through the circulation groove, so that the flushing liquid circulation is realized; after the flushing liquid circulates normally, the drill bit 3 breaks the particles into smaller ones by controlling the power rotation and up and down movement of the slag dredging drill tool, and the particles should be broken down in time during the operation, and the operation principle of less footage and more up and down movement is followed; the broken particles return upward through the gap between the outer pipe 1 and the hole wall, and enter the gap space between the outer pipe 1 and the inner pipe 2 from the opening 5 of the outer pipe 1; the drill tool is lifted and taken out, and the slag dredging operation is completed.

Claims

1. A small-diameter medium-deep hole sediment removal drilling tool, comprising an outer tube (1), an inner tube (2), a drill bit (3), and a joint (4), characterized in that The inner tube (2) is located inside the outer tube (1), and there is a gap between the outer tube (1) and the inner tube (2); a water hole (6) is provided in the center of the joint (4) and passes through the water hole (6) from top to bottom; the upper end of the joint (4) is connected to the drill pipe via a thread; a male thread is provided on the outer side of the lower end of the joint (4) and is connected to the female thread on the inner side of the upper end of the outer tube (1) via the male thread; a female thread is provided on the inner side of the lower end of the joint (4) and is connected to the male thread on the outer side of the upper end of the inner tube (2) via the female thread; the joint (4) The upper end of the gap space is closed. The center of the drill bit (3) is provided with a water hole (7) running through from top to bottom. A male thread is provided on the outer side of the upper end of the drill bit (3), and is connected to the female thread on the inner side of the lower end of the outer tube (1) through the male thread. The lower end of the inner tube (2) is provided with a male thread on the outer side, and is connected to the female thread in the water hole (7) of the drill bit (3) through the male thread. The drill bit (3) closes the lower end of the gap space, and the upper part of the outer tube (1) is symmetrically provided with openings (5).

2. The small-diameter medium-deep hole sediment removal drilling tool according to claim 1 is characterized in that The drill bit (3) is a composite drill bit.

3. The slag removal drill for small-diameter medium-deep holes according to claim 1 is characterized in that The joint (4) is a single-tube reducing joint.

4. The slag dredging drill for small-diameter medium-deep holes according to claim 1 is characterized in that The distance between the opening (5) and the joint (4) is 15 cm.

5. The slag removal drill for small-diameter medium-deep holes according to claim 1 is characterized in that The opening (5) is 10 cm long and 1.2 cm wide.

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