Annular pressure monitoring sealing device for geological drilling

Abstract

The invention relates to an annular pressure monitoring sealing device for geological drilling, which is applicable to drilling hole maintenance operation such as pressure monitoring, pressure control and pressure leak stopping in geological drilling construction. The device consists of a central pipe, a sealing shell, a pressure gauge, a safety valve, a pressure relief pipe, a spin valve, an orifice pipe, keys and a seal ring, wherein the sealing shell is arranged on the central pipe; four L-shaped notches are formed in the sealing shell; the pressure gauge and the safety valve are arranged on the sealing shell in a connected way; the pressure relief pipe is arranged on the sealing shell; the upper end of the pressure relief pipe is provided with the spin valve; the seal ring is arranged on the orifice pipe; the orifice pipe is arranged in the sealing shell; and four keys are welded on the outer wall of the orifice pipe for locking the relative position of the sealing shell and the orifice pipe. According to the device, the annular pressure change of a shaft can be monitored in real time, and meanwhile, operations such as sealing pressure maintaining and pressure relief can be performed; the device has effects of monitoring and controlling the pressure, keeping a hole wall stable and the like; the leak stopping effect and quality can be greatly improved and water burst is controlled to facilitate kill operation; and thus, the level of the drilling technology is improved and the drilling cost is effectively reduced.

Description

Technical field [0001] The invention relates to an annular pressure monitoring and sealing device for geological drilling, which is suitable for drilling maintenance operations such as pressure monitoring, pressure control, and pressure plugging in geological drilling construction. Background technique [0002] In geological drilling, the holes are usually open. The disadvantages of this open orifice are: 1. It is impossible to monitor the annular pressure in real time, it is impossible to control the annular pressure, and it is impossible to perform complex operations such as pressure plugging and water inrush control; 2. It is not safe and does not have the ability to deal with blowouts, well kicks, etc. Complicated accident capability; 3. It is not environmentally friendly, difficult to recover drilling fluid, and causes great pollution and damage to the natural environment. [0003] In oil well drilling, sealing devices such as blowout preventers or orifice throttling d...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the technical problems that there is no annular pressure monitoring and sealing device in the current geological drilling, it is impossible to monitor and control the annular pressure, and it is impossible to perform complex operations such as pressurized leakage plugging, well killing, and blowout prevention. Annular pressure monitoring and sealing device, which can not only monitor the change of wellb

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