CN102322226B - Self-locking and unlocking device for hollow drill pipe sampling pipe interface in soft rock formation - Google Patents

Abstract

The invention relates to a self-locking and unlocking device for the sampling pipe joints of hollow stems for soft formations. The bottom of the metal hollow stem female joint is symmetrically provided with slider sockets, movable locking sliders are mounted in the slider sockets, one end of each locking slider is extended out of the metal hollow stem female joint, the other end of each locking slider is connected with one end of a slider spring in the slider socket, and the other end of each slider spring is fixed on the inner wall of the slider socket. The end surface of the metal hollow stem male joint is symmetrically provided with bolt sockets, bolts are limited in the bolt sockets, one end of each bolt is fixed on a bolt spring, and the other end of each bolt is extended out of the end surface of the metal hollow stem male joint. The self-locking and unlocking device can prevent a drilling rig from being unthreaded during reverse rotation, and meanwhile, the drill stem can be conveniently replaced.

Description

Self-locking and unlocking device for hollow drill pipe sampling pipe interface in soft rock formation

technical field

The invention belongs to the technical field of underwater drilling, and relates to a self-locking and unlocking device for a sampling pipe interface of a hollow drill pipe in a soft rock formation.

Background technique

Core drilling tools used for soft rock formations such as soil, sediment, and silt, such as large-scale engineering drills, usually use hollow drill pipes (and casings) to take cores, and the outer wall of the drill pipe is threaded to provide downward driving force. When the drilling tool goes down, the connection part of the drill pipe will form self-tightening due to the design of the thread rotation. When lifting the drill, the frictional force and viscous force of the sediment and silt make the lifting resistance of the drill very large. It is necessary to reversely select the drill pipe while lifting the drill to provide upward force for the drill pipe by means of the thread. When the drill pipe rotates in reverse, the interface thread will be unscrewed, and the drill pipe may loosen and fall. The self-locking device can prevent the interface from loosening when the drilling tool rotates. In order to realize the automation and unmanned operation of drilling and coring, the unlocking mechanism matched with the self-locking mechanism and the manipulator operation is also very necessary.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a self-locking and unlocking device for the interface of the sampling pipe of the hollow drill pipe in the soft rock formation. The invention includes a metal hollow drill pipe female joint, a slider spring, a locking slide block, a latch, a latch spring and a metal hollow drill pipe male joint.

The bottom of the metal hollow drill pipe female joint is symmetrically opened with a slider groove, and a movable locking slider is installed in the slider groove. One end of the block spring is connected, and the other end of the slider spring is fixed to the inner wall of the slider groove.

The end face of the metal hollow drill pipe male joint is symmetrically provided with latch slots, the latch is limited in the latch slot, one end of the latch is fixed with the latch spring, and the other end extends out of the end face of the metal hollow drill pipe male joint.

The slider groove is arranged corresponding to the bolt groove, and the bolt in the bolt groove is in contact with the slope side of the locking slider in the slider groove.

The metal hollow drill pipe female joint is threadedly matched with the metal hollow drill pipe male joint.

The inner diameter of the entire metal hollow drill pipe is 40-200 mm, the wall thickness is 5-20 mm, the length of a single section is 2-5 meters, and the outer wall has external threads.

Beneficial effects of the invention: the invention can prevent the interface from loosening when the drilling tool rotates in reverse, and at the same time facilitate the replacement of the drill rod.

Description of drawings

Fig. 1 is the schematic diagram of device structure of the present invention;

Fig. 2 is the A-A direction view of Fig. 1;

Fig. 3 is the partial enlarged view of device of the present invention;

In the figure: metal hollow drill pipe female joint 1, slider spring 2, locking slider 3, latch 4, latch spring 5, metal hollow drill pipe male joint 6.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1, 2 and 3, the self-locking and unlocking device for the hollow drill pipe sampling pipe interface in soft rock formations includes a metal hollow drill pipe female joint 1, a slider spring 2, a locking slider 3, a latch 4, a latch spring 5 and Metal hollow drill pipe nipple 6.

The bottom of the metal hollow drill pipe female joint is symmetrically opened with a slider groove, and a translational locking slider is installed in the slider groove. One end of the locking slider extends out of the metal hollow drill pipe female joint (to facilitate the operation of the manipulator), and the other end It is connected with one end of the slider spring in the slider groove, and the other end of the slider spring is fixed with the inner wall of the slider groove.

The end face of the metal hollow drill pipe male joint is symmetrically opened with a pin groove, and the end face is in contact with the bottom of the female joint; the pin is limited in the pin groove, one end of the pin is fixed with the pin spring, and the other end extends out of the metal hollow drill pipe male joint. end face.

The slider groove and the pin groove are set correspondingly to ensure that the metal hollow drill pipe female joint is screwed into the metal hollow drill pipe male joint and the two can cooperate with each other. Contact; the head of the bolt in the embodiment is hemispherical, and such a design facilitates its contact with the slope of the locking slider, making the movement of the locking slider more stable.

The metal hollow drill pipe female joint and the metal hollow drill pipe male joint are threadedly matched, thus completing the splicing between the drill pipes.

The steps of the using method of the device of the present invention are as follows:

1) When drilling the wellhead, use the wellhead manipulator to press the locking slider on the metal hollow drill pipe female joint inward, and at the same time use the wellhead manipulator to fix the metal hollow drill pipe female joint.

2) Use the wellhead manipulator to connect the metal hollow drill pipe female joint with the metal threaded hollow drill pipe male joint. The two are rotated 90 degrees and tightened. Loosen the manipulator. Due to the elastic force of the slider spring, the locking slider pops out. Under the action of elastic force, the pin is pushed into the slider groove of the metal hollow drill pipe female joint;

3) The special drilling rig for soft rock starts to drill, the metal hollow drill rod rotates downward, and the torque is transmitted between the drill rods through conical threads;

4) The special drilling rig for soft rock strata recovers the drill pipe after drilling, and the metal hollow drill pipe performs reverse rotation movement. Due to the elastic force of the bolt spring, the bolt is bounced up, and the bolt is used between the drill pipes to prevent the drill pipe from loosening.

5) The wellhead manipulator is working, use the wellhead manipulator to press the locking slider on the metal hollow drill pipe female joint inward, and the two reversely rotate 90 degrees to loosen the metal hollow drill pipe female joint and the metal hollow drill pipe male joint , put the drill pipe into the designated position, the drilling of the metal hollow drill pipe is completed, and enter the standby state for the next operation.

Claims (1)

1. the self-locking of sampling pipe joints of hollow stems for soft formations and tripper, comprise metal hollow tool joint box, sliding block spring, lock slider, latch, latch spring and metal hollow fillet of tool joint pins, it is characterized in that:

Metal hollow tool joint box bottom symmetry has slide block slot, movable lock slider is housed in slide block slot, one end of lock slider stretches out outside the metal hollow tool joint box, and an end of the sliding block spring in the other end and slide block slot is connected, and the other end of sliding block spring and slide block slot inwall are fixed;

On the end face of metal hollow fillet of tool joint pins, symmetry has the latch groove, and latch is limited in the latch groove, and an end and the latch spring of latch are fixed, and the other end stretches out the end face of metal hollow fillet of tool joint pins;

Latch in described slide block slot and the corresponding setting of latch groove, latch groove and the inclined-plane side contacts of the lock slider in slide block slot;

Described metal hollow tool joint box and described metal hollow fillet of tool joint pins pass through threaded engagement.

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