Rotary eccentric casing pipe internally drilling device

Abstract

The invention relates to a rotary eccentric casing pipe internally drilling device, which is applied to the field of petroleum and natural gas exploration and development. According to the device, an eccentric steering mechanism is fixedly arranged in a casing pipe through an anchoring device, enters a casing pipe milling tool with a milling bit to mill the casing pipe, and then enters a drilling tool with a rotary drilling bit to drill in the ground. When the drilling is performed in the ground, a rotary driving mechanism drives a hose and the drilling bit to rotate, so that the friction between the hose and the steering mechanism is effectively overcome, and then the efficient drilling degree in the ground is improved. At the same time, due to the adoption of the eccentric steering mechanism, the hose drilling into the ground is allowed to obtain higher steering radius, and the hose can more easily enter the ground by the steering mechanism. Furthermore, the device does not require higher spraying pressure, so the requirement on the liquid supply pressure of ground equipment is reduced.

Description

Technical field [0001] The invention relates to a rotary eccentric inner casing drilling device used in the field of petroleum and natural gas exploration and development. Background technique [0002] The method of drilling from the inside of the casing to the formation is suitable for the development of low-permeability oil and gas reservoirs, and can effectively improve the oil drainage area and oil and gas recovery. At present, the commonly used casing drilling device is to transport the liquid with a certain pressure by the surface pump, through the hose to the downhole. Enter. During the drilling process, the hose is very rigid under the action of the high pressure of the internal liquid, and the steering gear is a centered structure. The frictional resistance between the hose and the steering gear is relatively large, and the drilling device only has non-rotating sliding Drilling function, so there is insurmountable frictional resistance when it passes through the s...

AI Technical Summary

Problems solved by technology

During the drilling process, the hose is very rigid under the action of the high pressure of the internal liquid, and the steering gear is a centered structure. The frictional resistance between the hose and the steering gear is relatively large, and the drilling device only has non-rotating sliding Drilling function, so when it passes through the steering gear, it cannot overcome the friction resistance, and it is difficult to realize the difficulty of long-distance sliding drilling

At the same time, high-pressure jet skid drilling requires high hydraulic pressure from surface pumps, so the pressure resistance of surface pumps and manifolds is very high, which limits the application of this technology

Images