Pressurized drilling device and implementation method thereof

Abstract

The invention discloses a pressurized drilling device and an implementation method thereof. The pressurized drilling device comprises a blowout prevention flange, wherein a central drill rod is inserted in the center of the blowout prevention flange in a penetrating mode, the bottom of the central drill rod is connected to a drill bit through a righting sleeve, and the top of the central drill rodis connected with a drill rod lengthening rod; the upper part of the blowout prevention flange is connected with a lower righting cross beam, the central drill rod is inserted in the middle of the lower righting cross beam in a penetrating mode, stand columns are inserted in the two ends of the lower righting cross beam in a penetrating mode, the bottom of each stand column is fixed on a fixing seat of a valve to be drilled, the central drill rod is connected with a fixing cross beam, and the top of each stand column is connected with a stand column lengthening rod; a motor cross beam is connected to the tops of the stand column lengthening rods, hydraulic cylinders are fixed at two ends of the motor cross beam, a motor bracket is connected to the middle of the motor cross beam, a hydraulic motor is arranged on the motor bracket, a connecting spline and a drill rod conversion shaft are arranged in the center of the motor bracket, an output shaft of the hydraulic motor is connected tothe drill rod conversion shaft through the connecting spline, and the bottom of the drill rod conversion shaft is connected with the top of the drill rod lengthening rod; and the hydraulic cylinders and the hydraulic motor are controlled by a hydraulic control console.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploitation, and in particular relates to a pressurized drilling device and method, which are mainly used in maintenance of main control valves of gas trees, gathering and transportation pipelines and the like. Background technique [0002] With the continuous development of oil and gas fields, due to various reasons, the gas production wellhead valves have caused severe corrosion of the valves, broken valve stems and out-of-control switches. The control valve cannot be operated, seriously affecting the normal production of the wellhead, and there are certain safety hazards, which greatly reduces the safety of subsequent wellhead operations. [0003] At present, the conventional practice in China for the main control valves with the above faults is to replace the main control valves with new ones by killing wells or to replace the faulty main control valves by freezing. Some special wellhead...

AI Technical Summary

Problems solved by technology

Some special wellhead main control valves cannot be switched on and off. The existing technology cannot solve the problem because there is no working channel.

Using kill operation to repair faulty main control valve is likely to affect the output of the operating wellhead, and there are many follow-up problems. The existing drilling devices in the market have a relatively small stroke, which is easy to restrict the scope of drilling operations.

The existing technology is relatively complicated, requires a lot of manpower and material resources to cooperate with the operation, the cycle is long, and the cost is high

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