CN210087272U - Locking piece hangs differential type coring tool - Google Patents

Abstract

The utility model discloses a lock block suspension differential type coring tool, which comprises a lock block suspension mechanism, an outer cylinder assembly, a rotating assembly, an inner cylinder assembly and a flap-type sealing mechanism. Hexagonal safety joint, inner hexagonal joint, center joint, pin, lock block, support joint, the outer hexagonal safety joint is provided with a pin hole and a lock block through hole, the inner hexagonal joint is provided with a lock block keyway, the center The joint, the support joint and the inner hexagonal joint are all provided with pressure relief holes, the outer cylinder assembly includes an outer cylinder short joint, an outer cylinder, and a coring bit, and the rotating assembly includes a snap ring, a bearing, a bearing box, a core The inner cylinder assembly includes a single-flow ball, an inner cylinder, a clamp seat, and a self-locking core claw. The flap-type sealing mechanism includes a flap, a flap base, and a screw. Compared with the prior art, The utility model solves the problems of uneven force and easy damage of the steel ball of the ball-suspended differential coring tool, and improves the safety and reliability of the differential coring tool.

Description

A lock block suspension differential coring tool

technical field

The utility model relates to the technical field of oil and natural gas drilling and coring, in particular to a differential type coring tool suspended by a lock block.

Background technique

Differential coring tool is a coring tool that uses the differential between the inner barrel and the outer barrel to seal the inner barrel, which can prevent the core from falling during the tripping process, and is widely used in loose and broken formations. The principle is to rely on the suspension mechanism to suspend the inner cylinder on the outer cylinder. When the heart is cut, the suspension mechanism is unlocked and the inner and outer cylinders are separated to complete the differential movement. The traditional suspension mechanism uses steel balls for suspension, and its advantage is that the mechanism can be unlocked relatively easily. However, in the actual use process, since the contact mode of the ball is point contact, the weight of the outer cylinder completely acts on the steel ball, and In the differential process, the strong mechanical impact force will cause a great pressure load on the contact point, which will easily lead to deformation or even damage of the steel ball, resulting in differential failure and affecting the coring effect.

Utility model content

The purpose of the present utility model is to provide a lock block suspension differential type coring tool in order to solve the above problems.

The utility model realizes the above-mentioned purpose through the following technical solutions:

The utility model comprises a lock block suspension mechanism, an outer cylinder assembly, a rotating assembly, an inner cylinder assembly and a flap-type sealing mechanism, and the lock block suspension mechanism includes an outer hexagonal safety joint, an inner hexagonal joint, a central joint, a pin, a lock Block, supporting joint, the outer hexagonal safety joint is provided with a pin hole and a lock block through hole, the inner hexagonal joint is provided with a lock block keyway, and the center joint, supporting joint and inner hexagonal joint are provided with pressure relief The outer cylinder assembly includes an outer cylinder short joint, an outer cylinder, and a coring bit, the rotating assembly includes a snap ring, a bearing, a bearing box, and a mandrel, and the inner cylinder assembly includes a single-flow ball, an inner barrel, clamp seat, self-locking core claw, the flap-type sealing mechanism includes flaps, flap bases, screws, the lower end of the outer hexagonal safety joint and the inner hexagonal joint form a gap plug fit, and the lock block passes through The through hole of the lock block is inserted into the keyway of the lock block of the inner hexagonal joint; the central joint and the outer hexagonal safety joint form a clearance fit, and are positioned with pins, and the central joint seals the lock block in the outer hexagonal safety joint and the inner hexagonal joint. , to prevent the inner hexagonal joint from sliding axially relative to the outer hexagonal safety joint, the support joint is connected to the lower part of the outer hexagonal safety joint through the thread, the mandrel is in turn with the bearing box and the bearing to form a clearance fit, and the upper part of the mandrel is connected with the snap ring through the thread, The mandrel is located inside the bearing box and is protected by the bearing box. The snap ring limits the bearing axially. The bearing box is connected to the lower part of the bearing joint through threads. The inner cylinder assembly, the self-locking core claw and the clamp seat are all cylindrical fittings. The self-locking core claw is tapered inside and the clamp seat is tapered outside. The self-locking core claw is freely placed in the clamp seat. , the two conical surfaces cooperate with each other, the self-locking core claw can move up and down along the axis of the clamp seat within the design distance to achieve the locking effect, and the torsion spring is welded on the back of the flap, which is connected to the flap base through the spring to form a flap type The sealing mechanism is fixed inside the coring bit by screws.

The beneficial effects of the present utility model are:

The utility model relates to a lock block suspension differential type coring tool. Compared with the prior art, the utility model solves the problems of uneven force and easy damage of the steel ball of the ball suspension differential type coring tool, and improves the differential The safety and reliability of the coring tool have the value of popularization and application.

Description of drawings

Fig. 1 is the structural sectional view of the present utility model;

Figure 2 is a schematic diagram of the present utility model after differential state structure;

Fig. 3 is the structure diagram of the outer hexagonal safety joint of the present invention;

Figure 4 is a structural diagram of the inner hexagonal joint of the present invention.

In the picture: 1-lock block suspension mechanism, 2-outer cylinder assembly, 3-rotation assembly, 4-inner cylinder assembly, 5-flap type sealing mechanism, 6-outer hexagonal safety joint, 7-inner hexagonal joint, 8-Center joint, 9-Pin, 10-Lock block, 11-Support joint, 12-Outer cylinder short joint, 13-Outer cylinder, 14-Snap ring, 15-Bearing, 16-Bearing box, 17-Spindle , 18-single-flow ball, 19-inner cylinder, 20-clamp seat, 21-self-locking core claw, 22-flip, 23-flip base, 24-screw, 25-coring bit, 26- Pressure relief hole, 27-pressurized steel ball, 28-pin hole, 29-lock block through hole, 30-lock block keyway.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in FIGS. 1 to 4 , the utility model includes a lock block suspension mechanism 1 , an outer cylinder assembly 2 , a rotating assembly 3 , an inner cylinder assembly 4 and a flap-type sealing mechanism 5 . The lock block suspension mechanism 1 includes an outer hexagonal safety joint 6 , an inner hexagonal joint 7 , a central joint 8 , a pin 9 , a lock block 10 , and a support joint 11 . The outer hexagonal safety joint 6 is provided with a pin hole 28 and a lock block through hole 29 (as shown in Figure 3), the inner hexagonal joint 7 is provided with a lock block keyway 30 (as shown in Figure 4), the central joint 8, the support joint 11 The inner hexagonal joint 7 is provided with a pressure relief hole 26 . The outer cylinder assembly 2 includes an outer cylinder short joint 12 , an outer cylinder 13 , and a coring bit 25 . The rotating assembly 3 includes a snap ring 14 , a bearing 15 , a bearing box 16 , and a spindle 17 . The inner cylinder assembly 4 includes a single-flow ball 18 , an inner cylinder 19 , a clamp seat 20 , and a self-locking core claw 21 . The flap-type sealing mechanism 5 includes a flap 22 , a flap base 23 and a screw 24 . The lower end of the outer hexagonal safety joint 6 and the inner hexagonal joint 7 form a gap insertion fit, the lock block 10 is inserted into the lock block keyway 30 of the inner hexagonal joint 7 through the through hole 29 of the lock block; the central joint 8 and the outer hexagonal safety joint 6 constitute a gap insertion The center joint 8 seals the lock block 10 in the hole grooves of the outer hexagonal safety joint 6 and the inner hexagonal joint 7 to prevent the inner hexagonal joint 7 from sliding axially relative to the outer hexagonal safety joint 6, supporting The joint 11 is connected to the lower part of the outer hexagonal safety joint 6 through threads. The mandrel 17 forms a clearance insert fit with the bearing box 16 and the bearing 15 in turn, and the upper part of the mandrel is connected with the snap ring 14 through threads. The mandrel 17 is located inside the bearing box 16 and is protected by the bearing box 16 . The snap ring 14 axially limits the bearing 15 , and the bearing box 16 is connected to the lower part of the bearing joint 11 through threads. The mandrel 17, the inner cylinder 19, and the clamp seat 20 are connected in sequence through threads to form an inner cylinder assembly. The self-locking core claw 21 and the clamp seat 20 are both cylindrical fittings. The self-locking core claw 21 has a taper inside, and the clamp seat 20 has a taper outside. The self-locking core claw 21 is freely placed on the clamp seat 20 Inside, the two conical surfaces cooperate with each other, and the self-locking core claw 21 can move up and down along the axis of the clamp seat 20 within the designed distance to achieve the locking effect. A torsion spring is welded on the back of the flap 22 , which is connected with the flap base 24 through the spring to form a flap type sealing mechanism, and is fixed inside the coring bit 25 by screws 24 .

The working principle of the present utility model is as follows:

In the assembled differential coring tool, the flap 22 is hidden outside the clamp seat 20 and is in an open state. Before the coring drilling, a single flow ball 18 is put into the water hole of the mandrel 17 to block the water hole of the mandrel 17, and the drilling fluid passes through The mandrel 17 is divided into the annular space between the inner cylinder 19 and the outer cylinder 13 , and flows out from the water hole of the coring bit 25 . After a new cycle is established, the pump pressure rises slightly, indicating that the single-flow ball 18 is seated and coring drilling begins. After the core drilling is completed, the drilling tool is lifted up, and the self-locking core claw 21 shrinks along the inner conical surface of the clamp seat 20 to pull out the core. In order to prevent the core from falling off during the tripping process, it is necessary to seal the core barrel with the help of the flap-type sealing mechanism. 27 drop to the ball seat of the center joint 8, block the drilling fluid flow channel and hold back pressure until the pin 9 is sheared. The central joint 8 goes down under the action of hydraulic force and sits on the step of the supporting joint 11. At this time, the keyway of the central joint 8 is exposed and radially aligned with the lock block. The outer hexagonal safety joint 6 squeezes the lock block into the outer cylinder under the action of gravity. The center joint has 8 keyways, the outer hexagonal safety joint 6 is separated from the inner hexagonal joint 7, and the outer hexagonal safety joint 6 and the outer cylinder assembly sit down on the step of the supporting joint 11 to complete the differential movement, as shown in Figure 2. After the differential movement is completed, the inner cylinder assembly 4 is lifted upward relative to the flap-type sealing mechanism 5, and the flap 22 hidden outside the clamp seat 20 is exposed. Prevent the core from falling off during tripping. At the same time, the pressure relief holes 26 of the central joint 8, the support joint 11 and the inner hexagonal joint 7 are radially aligned, the drilling fluid flows out from the pressure relief holes 26, the circulation is re-established, and the pump pressure returns to normal.

When preparing to coring an oil layer, assemble the coring tool as shown in Figure 1. Before the coring drilling, the single-flow ball is put in. After the single-flow ball is seated, the pump pressure is slightly increased, and the coring drilling starts. After the coring drilling is completed, lift the drilling tool to pull out the core and stop the pump. Put the pressurized steel ball at the ground manifold and turn on the pumping ball. After the pressurized steel ball is seated, the pump pressure rises and the pin is cut. The center joint goes down under the action of hydraulic force and is located on the step of the support joint. The outer hexagonal safety joint squeezes the lock block into the keyway of the central joint, and the inner and outer hexagonal joints are separated to complete the differential movement and the pump pressure falls back. The flap hidden outside the clamp seat is exposed and closed to seal the lower part of the core barrel to ensure that the core does not fall off during the tripping process.

The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention There will also be various changes and improvements in the new model, which all fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (1)

1. A locking block suspension differential coring tool is characterized in that: comprises a locking block suspension mechanism, an outer cylinder assembly, a rotating assembly, an inner cylinder assembly and a flap type sealing mechanism, the locking block hanging mechanism comprises an outer hexagonal safety joint, an inner hexagonal joint, a central joint, a pin, a locking block and a bearing joint, the outer hexagonal safety joint is provided with a pin hole and a locking block through hole, the inner hexagonal joint is provided with a locking block key groove, the central joint, the bearing joint and the inner hexagonal joint are all provided with pressure relief holes, the outer barrel assembly comprises an outer barrel short section, an outer barrel and a coring bit, the rotating assembly comprises a clamping ring, a bearing box and a mandrel, the inner cylinder assembly comprises a uniflow ball, an inner cylinder, a clamping hoop seat and a self-locking core claw, the turning plate type sealing mechanism comprises a turning plate, a turning plate base and a screw, the lower end of the outer hexagonal safety joint and the inner hexagonal joint form clearance insertion fit, and a locking block penetrates through a locking block through hole and is inserted into a locking block key groove of the inner hexagonal joint; the central joint and the outer hexagonal safety joint form clearance splicing fit, and are positioned by adopting a pin, the central joint seals a locking block in the hole grooves of the outer hexagonal safety joint and the inner hexagonal joint to prevent the inner hexagonal joint from axially sliding relative to the outer hexagonal safety joint, the bearing joint is connected with the lower part of the outer hexagonal safety joint through threads, the mandrel is sequentially connected with the bearing box and the bearing to form clearance splicing fit, the upper part of the mandrel is connected with a snap ring through threads, the mandrel is positioned in the bearing box and protected by the bearing box, the snap ring axially limits the bearing, the bearing box is connected with the lower part of the bearing joint through threads, the mandrel, the inner cylinder and the clamp seat are sequentially connected through threads to form an inner cylinder assembly, the self-locking type core claw and the clamp seat are cylindrical accessories, the inside of the self-locking type core claw is provided with taper, the outside of the clamp seat, the conical surfaces of the core claw and the core claw are matched with each other, the self-locking core claw can move up and down along the axis of the clamp seat within a designed distance to achieve the locking effect, the back of the turning plate is welded with a torsion spring, the torsion spring is connected with the turning plate base through the spring to form a turning plate type sealing mechanism, and the turning plate type sealing mechanism is fixed inside the coring drill through a screw.

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