Pressure control drilling assisting device

Abstract

The invention belongs to the technical field of petroleum and natural gas drilling pressure control equipment, and particularly relates to a pressure control drilling assisting device. The device comprises a three-way valve connected to an outlet pipeline of a slurry pump, and the other two outlets of the three-way valve are connected with an inlet pipeline and an auxiliary pipeline respectively;the other end of the inlet pipeline is connected with a drill pipe, and the other end of the auxiliary pipeline is connected with an annulus. Compared with the prior art, the device has the followingadvantages that single pipes can be connected, a drill can be put down and a rotary head is maintained under the condition that the pump is not stopped; the constant pressure at the well bottom can bemaintained under the condition that a return pressure pump is not used, the occupied space is reduced, the device can be used for working occasions with limited working space, the installation and maintenance cost is reduced, the complexity degree of a system is reduced, and maintenance is facilitated; the large pump and the return pressure pump can be prevented from being started and stopped frequently, and the energy loss can be reduced; the assisting device can be used for land or ocean control pressure drilling, and simple, safe and reliable well bottom pressure control is realized.

Description

technical field [0001] The invention belongs to the technical field of oil and natural gas drilling pressure control equipment, and in particular relates to a pressure-controlled drilling auxiliary device. Background technique [0002] The oil drilling mud pump is a drilling supporting equipment used to transport media (water, mud and other flushing fluids). Its function is to inject the mud into the downhole with the drill bit, and play a role in cooling the drill bit, cleaning the drilling tool, fixing the well wall, and driving the drilling. And the function of bringing cuttings back to the ground after drilling; [0003] In the drilling process, the positive circulation drilling method is commonly used. The mud pump sends the surface flushing medium-clear water, mud and polymer flushing fluid under a certain pressure, through the high-pressure hose, the faucet and the center hole of the drill string to the bottom of the drill bit. , in order to achieve the purpose of co...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an auxiliary device for pressure controlled drilling in view of the existing problem that the back pressure pump is used to maintain a constant pressure at the bottom of the well, and the start and stop of the large pump and the back pressure pump will cause energy loss.

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