CN209817938U - An auxiliary tool for ultra-short radius drilling - Google Patents

Abstract

The utility model ultra-short radius drilling auxiliary tool is characterized in that it is composed of: a drill bit, a circlip, an oil seal, a thrust ball bearing, a deep groove ball bearing, a shell, a shaft, a spacer, an inner shell, a notch partition and a reversing Key composition, the drill bit is set at the front end of the shaft at the axis of the inner shell, the shaft passes through the axis of the inner hole of the inner shell, the notch partition is set in the middle of the inner hole of the inner shell, two thrust ball bearings and two deep groove ball bearings They are arranged symmetrically on both sides of the notch partition, and the two oil seals are respectively arranged in the front and rear of the inner casing for sealing connection between the inner casing and the shaft; there are retaining springs at the front and rear ends of the inner hole of the inner casing , a reversing key is provided in the reversing slideway between the outer shell and the inner shell. When drilling, the utility model changes the position of the reversing key in the reversing slideway by lifting and lowering the drilling tool to change the angle of the drill bit, and cooperates with the rear drilling tool to achieve turning and straight-line drilling. It has simple structure and stable performance. , the effect is excellent, and the construction period can be greatly shortened.

Description

An auxiliary tool for ultra-short radius drilling

technical field

The utility model relates to a drilling tool for oil exploitation, in particular to an auxiliary tool for ultra-short radius drilling.

Background technique

At present, horizontal wells are traditionally used in the domestic petroleum industry, and their application scope is much superior to that of vertical wells, which greatly increases the contact area of gas, groundwater, and underground oil and gas in the unsaturated zone, and effectively improves the fluid extraction efficiency. In the prior art, the inclination angle of the horizontal well is at or close to 90°, and the inclination angle can exceed or be less than 90° for certain special needs. According to the size of the curvature radius of the horizontal well, it is divided into: long-radius horizontal well, medium-radius horizontal well, medium-short radius horizontal well, short-radius horizontal well and ultra-short-radius horizontal well. The horizontal radius of curvature is 1m to 4m. In the prior art, ultra-short-radius horizontal wells are used for drilling, and the radius of curvature is realized by water jet tools or flexible tools. There is a problem: the drilling pressure applied to the overall drilling tool during the drilling process will not be effectively and smoothly transmitted to the drill bit, and the drill bit drives the overall drill bit. It has a chain vibration effect, which causes the radial runout of the drill bit to form a deflection of the drill bit, resulting in irregular wellbore roundness and poor wellbore uniformity, which gradually lead to defects such as the deviation of the drilling trajectory from the original set position and the drilling distance is too short.

Contents of the invention

The utility model overcomes the above-mentioned defects, and its purpose is to solve the current ultra-short-radius horizontal well drilling. During the drilling process, the drilling pressure applied to the integral drilling tool will not be effectively and smoothly transmitted to the drill bit, and the drill bit drives the integral drilling tool to produce interlocking. The vibration effect causes the radial runout of the drill bit to form a bit deflection, which leads to irregular wellbore roundness, poor wellbore uniformity, and gradually causes the drilling trajectory to deviate from the original set position and the drilling distance is too short. Ultra-short radius drilling aids.

The utility model ultra-short radius drilling auxiliary tool is characterized in that it is composed of: a drill bit, a circlip, an oil seal, a thrust ball bearing, a deep groove ball bearing, a shell, a shaft, a spacer, an inner shell, a notch partition and a reversing The drill bit is set at the front end of the shaft at the axis of the inner shell, the shaft passes through the axis of the inner hole of the inner shell, the notch partition is set in the middle of the inner hole of the inner shell, two thrust ball bearings and two deep groove ball bearings They are arranged symmetrically on both sides of the notch partition, and the two oil seals are respectively arranged in the front and rear of the inner casing in sealing connection between the inner casing and the shaft; there are retaining springs at the front and rear ends of the inner hole of the inner casing , a reversing key is provided in the reversing slideway between the outer shell and the inner shell.

The notch partition and the inner shell are of an integrated structure, or the notch partition is fixedly connected with the inner shell.

The seat ring of the thrust ball bearing is arranged on the outer side of the deep groove ball bearing, the upper part of the shaft ring of the thrust ball bearing, and the two deep groove ball bearings are respectively arranged on both sides of the notch partition.

The inner casing is provided with a long reversing slideway and a short reversing slideway.

The ultra-short radius drilling auxiliary tool of the utility model is transmitted to the drill bit through the axis of the inner shell shaft during drilling work, and the position of the reversing key in the reversing slide can also be changed by lifting and lowering the drilling tool to change the angle of the drill bit. The rear drilling tool can achieve turning or straight drilling; during the drilling process, the elevation angle of the drill bit can be adjusted at any time according to the formation, so that the drilling trajectory is always in the middle of the oil layer. The structure is simple, the performance is stable, the effect is excellent, and the construction period can be greatly shortened.

Description of drawings

Fig. 1 is a schematic structural diagram of an ultra-short radius drilling auxiliary tool;

Fig. 2 is a schematic structural view of the inner shell 9;

In the figure: 1 is a drill bit, 2 is a circlip, 3 is an oil seal, 4 is a thrust ball bearing, 5 is a deep groove ball bearing, 6 is an outer shell, 7 is a shaft, 8 is a pad, 9 is an inner shell, and 10 is a concave Mouth partition, 11 are reversing keys, 12 are long reversing slideways, and 13 are short reversing slideways.

Detailed ways

The utility model's ultra-short radius drilling auxiliary tool is realized in this way, which will be described in detail below in conjunction with the accompanying drawings.

See Fig. 1, Fig. 2, the ultra-short radius drilling auxiliary tool of the utility model is made of: drill bit 1, retaining spring 2, oil seal 3, thrust ball bearing 4, deep groove ball bearing 5, shell 6, shaft 7, spacer 8 , an inner shell 9, a notch partition 10 and a reversing key 11, the drill bit 1 is set at the front end of the shaft 7 at the axis of the inner shell 9, the shaft 7 passes through the axis of the inner hole of the inner shell 9, and the notch partition 10 is set In the middle of the inner hole of the inner shell 9, two thrust ball bearings 4 and two deep groove ball bearings 5 are respectively symmetrically arranged on both sides of the notch partition 10, and two oil seals 3 are respectively between the inner shell 9 and the shaft 7 The sealing connection is arranged at the front and rear of the inner shell 9; the front and rear ends of the inner hole of the inner shell 9 are provided with a circlip 2, and a reversing slide is provided in the reversing slideway between the outer shell 6 and the inner shell 9. key 11.

The notch partition 10 and the inner shell 9 may be in an integrated structure, or the notch partition 10 and the inner shell 9 are fixedly connected.

The seat ring of the thrust ball bearing 4 is arranged on the outer side of the deep groove ball bearing 5 , the upper part of the shaft ring of the thrust ball bearing 4 , and the two deep groove ball bearings 5 are respectively arranged on both sides of the notch partition 10 .

The inner casing 9 is provided with a long reversing slideway 12 and a short reversing slideway 13 .

When drilling, the ultra-short radius drilling auxiliary tool of the utility model can not only transmit the drilling pressure to the drill bit 1 through the shaft 7 at the axis center of the inner shell 9, but also change the reversing key 11 in the reversing slide by lifting up and down the drilling tool. The position in the track changes the angle of the drill bit 1 . When the reversing key 11 is in the long reversing slideway, the inner casing 9 moves forward, and the inner casing 9 is lifted by the spacer 8 so that the drill bit 1 connected to the shaft 7 forms a certain angle with the outer casing 6, and cooperates with the rear drilling tool. According to the predetermined design, the turning and deflection drilling can be achieved; when the reversing key 11 is on the short reversing slideway, the inner shell 9 is retracted into the outer shell 6, and the drill bit 1 is in the axial position of the outer shell, so that the drill bit 1 can drill in a straight line; During the drilling process, the elevation angle of drill bit 1 can be adjusted at any time according to the formation, so that the drilling trajectory is always in the middle of the oil layer.

The ultra-short-radius drilling auxiliary tool of the utility model is transmitted to the drill bit through the axis of the inner shell shaft during drilling work, and the position of the reversing key in the reversing slideway can also be changed by lifting and lowering the drilling tool to change the angle of the drill bit. The rear drilling tool can achieve turning or straight drilling; during the drilling process, the elevation angle of the drill bit can be adjusted at any time according to the formation, so that the drilling trajectory is always in the middle of the oil layer. The structure is simple, the performance is stable, the effect is excellent, and the construction period can be greatly shortened.

Claims (4)

1. An auxiliary tool for ultra-short radius drilling, characterized in that: it is composed of: drill bit (1), circlip (2), oil seal (3), thrust ball bearing (4), deep groove ball bearing (5), shell (6), shaft (7), spacer (8), inner shell (9), notch partition (10) and reversing key (11), and the drill bit (1) is set at the axis center of the inner shell (9) The front end of the shaft (7), the shaft (7) passes through the axis of the inner hole of the inner shell (9), the notch partition (10) is set in the middle of the inner hole of the inner shell (9), and the two thrust ball bearings (4 ) and two deep groove ball bearings (5) are symmetrically arranged on both sides of the notch partition (10), and two oil seals (3) are respectively arranged in the sealing connection between the inner casing (9) and the shaft (7) The front and rear parts of the inner shell (9); the front and rear ends of the inner hole of the inner shell (9) are provided with snap springs (2), and the reversing slide between the outer shell (6) and the inner shell (9) A reversing key (11) is provided in the track. 2. The ultra-short radius drilling auxiliary tool according to claim 1, characterized in that: the notch partition (10) and the inner shell (9) are in an integrated structure, or the notch partition (10) and The inner shell (9) is fixedly connected. 3. The ultra-short radius drilling auxiliary tool according to claim 1, characterized in that: the seat ring of the thrust ball bearing (4) is arranged on the outer side of the deep groove ball bearing (5), and the thrust ball bearing (4) On the upper part of the shaft ring, two deep groove ball bearings (5) are respectively arranged on both sides of the notch partition (10). 4. The ultra-short radius drilling auxiliary tool according to claim 1, characterized in that: the inner casing (9) is provided with a long reversing slideway (12) and a short reversing slideway (13).