CN108915625B - A kind of drilling machine outer cylinder unlocking mechanism - Google Patents

Abstract

The present invention discloses a kind of drilling machine outer cylinder unlocking mechanism, including connecting tube, outer cylinder and lock pin, connecting tube, outer cylinder and lock pin are coaxial, lock pin is in connecting tube, connecting tube leading portion outer diameter is less than outer cylinder internal diameter, connecting tube leading portion side wall has through-hole A, the fluted A of lock pin outer wall, the fluted B of outer tube inner wall, it further include pin, length of pin is greater than through-hole A depth, pin is in through-hole A, pin outer end chamfered and/or the side groove B are inclined-plane, the width of groove A is not less than pin inner end width, the width of groove B is not less than pin outer end width, before starting, connecting tube front end is in outer cylinder, pin is in front of groove A, pin inner face is slidably matched with lock pin outer wall, pin outer end is embedded in groove B, after starting, pin inner end is embedded in groove A, the distance of pin inner face to outer tube inner wall is greater than length of pin.Drilling machine outer cylinder unlocking mechanism provided by the invention can lock outer cylinder before drilling machine works, and drilling machine is started to work, and release the constraint to outer cylinder.

Description

An unlocking mechanism for the outer cylinder of a drilling rig

technical field

The invention relates to a drilling and coring system, in particular to an unlocking mechanism for an outer cylinder of a drilling rig.

Background technique

In the process of oilfield exploration, cores are important data for discovering oil and gas layers and studying formations, oil source layers, oil reservoirs, cap rocks, structures, etc. Through observation and research on cores, we can directly understand the lithology and physical properties of underground rock formations And oil, gas, water features. After the oilfield is put into development, it is necessary to further study and understand the sedimentary characteristics of the oil layer, the physical properties, pore structure, wettability, relative permeability, lithofacies characteristics of the reservoir, the physical simulation of the oil layer and the water flooding law of the oil layer through the core; In the development stage and the water flooding characteristics of oil layers in different water-cut stages, the distribution of remaining oil can be clarified, which can provide scientific basis for the design of oilfield development plan, layer series, well pattern adjustment and infill wells.

Core taking is to use special coring tools to take underground rocks to the ground in blocks during the drilling process. This block of rocks is called cores, through which various properties of rocks can be measured and the underground structure can be studied intuitively. and rock depositional environment, understand the nature of fluids, etc. In the process of mineral exploration and development, it is necessary to carry out drilling work according to the geologically designed stratum level and depth, to lower the coring tool into the well, and to drill out the rock samples.

Before coring, the coring equipment needs to be put into the drilling as a whole. After the coring equipment reaches the working position, the rear part of the coring equipment is fixed, and the front working mechanism releases the constraint and continues to work forward.

Contents of the invention

The present invention aims to provide an unlocking mechanism for the outer cylinder of a drilling rig, which can lock the outer cylinder before the core drilling machine works, and the core drilling machine starts to work, releasing the constraint on the outer cylinder.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

The unlocking mechanism of the outer cylinder of the drilling rig disclosed by the present invention includes a connecting pipe, an outer cylinder and a lock pin, the connecting pipe, the outer cylinder and the locking pin are coaxial, the locking pin is inside the connecting pipe, the outer diameter of the front section of the connecting pipe is smaller than the inner diameter of the outer cylinder, and the front section of the connecting pipe is The side wall has a through hole A, the outer wall of the lock pin has a groove A, and the inner wall of the outer cylinder has a groove B, the groove A and the groove B are both annular grooves, and a pin is also included, and the length of the pin is greater than the depth of the through hole A , the pin is in the through hole A, the outer end of the pin is chamfered and/or the side of the groove B is a slope, the width of the groove A is not less than the width of the inner end of the pin, and the width of the groove B is not less than the width of the outer end of the pin, Before starting, the front end of the connecting pipe is in the outer cylinder, the pin is in front of the groove A, the inner end surface of the pin is slidingly matched with the outer wall of the lock pin, and the outer end of the pin is embedded in the groove B. After starting, the inner end of the pin is embedded in the groove A, and the pin is in the The distance from the end face to the inner wall of the outer cylinder is greater than the length of the pin.

Further, an interlocking mechanism is connected to the rear of the connecting pipe.

Further, the locking pin is connected with a starting mechanism behind it.

Further, a locking piece A is connected behind the lock pin, and a locking piece B is connected behind the connecting pipe. The outer diameter of the locking piece A is larger than the inner diameter of the locking piece B, and the locking piece A is behind the locking piece B. .

Further, the front of the outer cylinder is connected with the drill bit and the rotor of the hydraulic motor.

Further, the included angle between the chamfer of the outer end of the pin and the radial section and the included angle between the side of the groove B and the radial section are complementary.

Further, the side of the groove A is a slope.

Further, the pin includes a nail head and a nail body, and the through hole A is correspondingly provided with a nail head section and a nail body section.

Further, the length of the nail head is less than the depth of the nail head section, and the length of the nail body is greater than the depth of the nail body section.

Further, the through hole A is a round hole, and there are three through holes A, the axial distance from the center of the through hole A to the front end of the connecting pipe is the same, and the three through holes A are evenly distributed along the circumference.

The present invention has the following beneficial effects:

1. Before the drilling rig is started, the pin is inserted into the groove B to fix the outer cylinder;

2. When the drilling rig is started, the lock pin slides forward, and the inner end of the pin slides and fits with the outer wall of the lock pin. When the groove A slides forward to the same axial position as the pin, the outer cylinder uses its own gravity to generate forward pressure. The contact surface between the groove B and the pin is an inclined plane, the groove B squeezes the outer end surface of the pin, the pin withdraws from the groove B, is pressed into the groove A, and the constraint on the outer cylinder is released;

3. Groove A and groove B are both annular grooves, making it easier for the pin to fit into groove A or groove B;

4. Locking piece A and locking piece B cooperate with each other to limit the distance that the lock pin can move forward;

5. There are 3 through holes A, which are evenly distributed along the circumference, and the outer cylinder is locked more firmly;

6. The design of the nail head, the nail body and the nail head section and the nail body section can prevent the pin from slipping out of the through hole A.

Description of drawings

Fig. 1 is a schematic diagram before the start of the present invention;

Fig. 2 is a schematic diagram after the start of the present invention;

Fig. 3 is a pin schematic diagram;

Fig. 4 is a schematic diagram of connecting pipe;

Fig. 5 is a schematic diagram of the locking pin;

In the figure: 1-lock pin, 11-groove A, 12-connecting part, 13-working part, 14-inserting part, 2-connecting pipe, 21-through hole A, 211-nail head section, 212-nail body section , 22-Rear connection section, 23-Liquid outlet section, 24-Nail-containing section, 25-Front connection section, 26-Through hole B, 27-Diversion groove, 3-Outer cylinder, 31-Groove B, 4-pin, 41-nail head, 42-nail body.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the unlocking mechanism of the outer cylinder of the drilling rig disclosed by the present invention includes a connecting pipe 2, an outer cylinder 3 and a lock pin 1, the connecting pipe 2, the outer cylinder 3 and the lock pin 1 are coaxial, and the lock pin 1 is connected to the connecting pipe 2. Inside, the outer diameter of the front section of the connecting pipe 2 is smaller than the inner diameter of the outer cylinder 3. There is a through hole A21 on the side wall of the front section of the connecting pipe 2. The through hole A21 is a round hole. There are 3 through holes A21. The center of the through hole A21 reaches the front end of the connecting pipe 2. The axial distance is the same, the three through holes A21 are evenly distributed along the circumference, the outer wall of the lock pin 1 has an annular groove A11, the side of the groove A11 is a slope, the inner wall of the outer cylinder 3 has an annular groove B31, and the pin 4, the length of the pin 4 Greater than the depth of the through hole A21, the number of 4 pins is the same as that of the through hole A21, the pin 4 is in the through hole A21, the outer end of the pin 4 is chamfered, the side of the groove B31 is a slope, the outer end of the pin 4 is chamfered and radial The included angle of the section and the included angle between the side of the groove B31 and the radial section are complementary, the pin 4 includes a nail head 41 and a nail body 42, the nail head 41 is on the inner side, and the through hole A21 is correspondingly divided into a nail head section 211 and a nail body section 212, the nail head section 211 is inside, the nail head section 211 inner diameter is not less than the nail head 41 outer diameter, the nail body section 212 inner diameter is not less than the nail body 42 outer diameter, the nail head 41 length is less than the nail head section 211 depth, the nail body 42 length is greater than The depth of the nail body section 212, the width of the groove A11 is not less than the width of the inner end of the pin 4, the width of the groove B31 is not less than the width of the outer end of the pin 4, the lock pin 1 is connected to the rear of the locking member A, and the rear of the connecting pipe 2 is connected to a locking Part B, the outer diameter of locking part A is larger than the inner diameter of locking part B, and locking part A is behind locking part B. The mutual cooperation between locking part A and locking part B can limit the distance that lock pin 1 can move forward, so that The lock pin 1 no longer slides forward after reaching the working position, the interlocking mechanism is connected to the rear of the connecting pipe 2, the starting mechanism is connected to the rear of the lock pin 1, and the drill bit and the hydraulic motor rotor are connected to the front of the outer cylinder 3.

Before starting, the front end of the connecting pipe 2 is in the outer cylinder 3, the pin 4 is in front of the groove A11, the inner end surface of the pin 4 is slidingly matched with the outer wall of the locking pin 1, and the outer end of the pin 4 is embedded in the groove B31. After starting, the inner end of the pin 4 is embedded In the groove A11 , the distance from the inner end surface of the pin 4 to the inner wall of the outer cylinder 3 is greater than the length of the pin 4 .

As shown in Figure 3, the length of the pin 4 is 17.3 mm, wherein the length of the nail head 41 is 4.8 mm, the length of the nail body 42 is 12.5 mm, the outer diameter of the nail head 41 is 12 mm, and the outer diameter of the nail body 42 is 10 mm. The outer end faces have chamfers of 2.5mm×45°.

As shown in Figure 4, the connecting pipe 2 includes the front section of the connecting pipe and the rear section of the connecting pipe. The nail section 24 and the front connecting section 25, the inner diameter of the rear connecting section 22 is larger than the inner diameter of the liquid outlet section 23, the outer diameter of the rear connecting section 22 is larger than the outer diameter of the liquid outlet section 23, and the front end surface of the rear connecting section 22 is inclined from outside to inside , the angle with the radial section is 45°, the rear connecting section 22 has an internal thread, the liquid outlet section 23 has a through hole B26, the through hole B26 is a pressure relief hole, the outer diameter of the liquid outlet section 23 is 94.5mm, and the liquid outlet section The inner diameter of 23 behind the through hole B26 is 74 mm, the inner diameter of the liquid outlet section 23 in front of the through hole B26 is 72 mm, and the front end surface of the through hole B26 is connected to the inner wall of the liquid outlet section 23 through an inclined plane with an angle of 76° to the radial section. The through hole B26 is a strip hole, the width of the through hole B26 is 16 mm, the front and rear sides of the through hole B26 are semi-arc surfaces, and the radius of the semi-arc surface is 8 mm. The width is 15mm, the diversion groove 27 is in front of the through hole B26, there are two through holes B26 and the diversion groove 27, evenly distributed along the circumference, the inner diameter of the front section of the connecting pipe is 50mm, the inner wall of the outlet section 23 and the nail-containing section The inner wall of 24 is connected by an inclined plane with an included angle of 45° to the radial section, the connection position between the inner wall of the nail-containing section 24 and the inclined plane at an included angle of 45° with the radial section is in the liquid outlet section 23, and the through hole A21 is in the nail-containing section 24 , including the nail section 24, the wall thickness is 14mm, the through hole A21 is divided into the nail head section 211 and the nail body section 212, the nail head section 211 is 5mm deep, the nail body section 212 is 9mm deep, the nail head section 211 has a hole diameter of 12.1mm, and the nail body section 212 The aperture is 10mm, and there are 3 through holes A21, which are evenly distributed along the circumference. The angle to the section is 15°, the length of the rear connecting section 22 is 155mm, the length of the liquid outlet section 23 is 35mm, the length of the nail-containing section 24 is 25mm, the length of the front connecting section 25 is 65mm, and the front connecting section 25 has external threads .

As shown in Figure 5, the inner diameter of the lock pin 1 is 32mm, and the length of the lock pin 1 is 220mm. The outer wall of the connecting part 12 has M40×1.5 threads, and the area on the outer wall of the connecting part 12 that is no more than 8mm from the front end of the working part 13 has no threads. The outer wall of part 13, the distance between the bottom surface of groove A11 and the axis of lock pin 1 is 22.5mm, the distance between the front end of connecting part 12 and the front end of the opening of groove A11 is 59mm, the opening width of groove A11 is 25.5mm, the bottom surface of groove A11 and the outer wall of working part 13 The insertion part 14 has a length of 98mm and an outer diameter of 48mm by being connected with an inclined plane with an included angle of 45° in the radial section.

Before the drilling rig is started, the pin 4 is embedded in the groove B31 to fix the outer cylinder 3; when the drilling rig is started, the locking pin 1 slides forward, and the inner end of the pin 4 slides to fit with the outer wall of the locking pin 1. When the groove A11 slides forward to meet the pin 4 When in the same axial position, the outer cylinder 3 uses its own gravity to generate forward pressure, the contact surface between the groove B31 and the pin 4 is a slope, the groove B31 squeezes the slope of the pin 4, and the pin 4 withdraws from the groove B31, Pressed into the groove A11, the constraint on the outer cylinder 3 is released.

Certainly, the present invention also can have other various embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes All changes and modifications should belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1. An unlocking mechanism for the outer cylinder of a drilling rig, characterized in that it includes a connecting pipe (2), an outer cylinder (3) and a lock pin (1), a connecting pipe (2), an outer cylinder (3) and a lock pin (1) Coaxial, the lock pin (1) is in the connecting pipe (2), the outer diameter of the front section of the connecting pipe (2) is smaller than the inner diameter of the outer cylinder (3), and the front section of the connecting pipe (2) has a through hole A (21) on the side wall. The outer wall of the locking pin (1) has a groove A (11), the inner wall of the outer cylinder (3) has a groove B (31), and also includes a pin (4), the length of the pin (4) is greater than the depth of the through hole A (21) , the pin (4) is in the through hole A (21), the outer end of the pin (4) is chamfered and/or the side of the groove B (31) is a bevel, and the width of the groove A (11) is not less than the pin ( 4) The width of the inner end, the width of the groove B (31) is not less than the width of the outer end of the pin (4). ) front, the inner end surface of the pin (4) slides with the outer wall of the lock pin (1), and the outer end of the pin (4) fits into the groove B (31). After starting, the inner end of the pin (4) fits into the groove A (11) Inside, the distance from the inner end surface of the pin (4) to the inner wall of the outer cylinder (3) is greater than the length of the pin (4). 2. The unlocking mechanism for the outer cylinder of the drilling rig according to claim 1, characterized in that an interlocking mechanism is connected behind the connecting pipe (2). 3. The unlocking mechanism for the outer cylinder of the drilling rig according to claim 1, characterized in that: the locking pin (1) is connected to the rear of the starting mechanism. 4. The unlocking mechanism for the outer cylinder of the drilling rig according to claim 1, characterized in that: a locking piece A is connected behind the lock pin (1), a locking piece B is connected behind the connecting pipe (2), and the lock The outer diameter of the locking piece A is larger than the inner diameter of the locking piece B, and the locking piece A is behind the locking piece B. 5. The unlocking mechanism of the outer cylinder of the drilling rig according to claim 1, characterized in that: the front of the outer cylinder (3) is connected to the drill bit and the rotor of the hydraulic motor. 6. The unlocking mechanism of the outer cylinder of the drilling rig according to claim 1, characterized in that: the angle between the chamfer of the outer end of the pin (4) and the radial section and the angle between the side of the groove B (31) and the radial section Mutually surplus. 7. The unlocking mechanism for the outer cylinder of the drilling rig according to claim 1, characterized in that: the side of the groove A (11) is a slope. 8. The unlocking mechanism for the outer cylinder of the drilling rig according to claim 1, characterized in that: the pin (4) includes a nail head (41) and a nail body (42), and the through hole A (21) is correspondingly provided with a nail head Section (211) and nail body section (212). 9. The unlocking mechanism for the outer cylinder of the drilling rig according to claim 8, characterized in that: the length of the nail head (41) is shorter than the depth of the nail head section (211), and the length of the nail body (42) is longer than that of the nail body section (212) depth. 10. The unlocking mechanism of the outer cylinder of the drilling rig according to claim 1, characterized in that: the through hole A (21) is a round hole, there are three through holes A (21), and the center of the through hole A (21) reaches The axial distances at the front ends of the connecting pipes (2) are the same, and the three through holes A (21) are evenly distributed along the circumference.