Downhole stepping drilling weight loader and control method thereof

Abstract

The invention provides an underground stepping type bit pressure loading device and a control method thereof. The underground stepping type bit pressure loading device specifically comprises a hollow pipeline, a first anchoring cylinder and a second anchoring cylinder, a backup arm, a first thrust piston and a second thrust piston, a baffle, a control center and the like, wherein the first anchoring cylinder and the second anchoring cylinder sleeve the hollow pipeline; the backup arm on the anchoring cylinders can do stretching-out or retracting movement under the effect of the control center and is supported on a well wall after stretching out; the hollow pipeline is forwards pushed relative to the anchoring cylinders under the hydraulic effect so that bit pressure is applied to a drill bit; after the backup arm is retracted, the anchoring cylinders can slide back to the original positions along the hollow pipeline. The two sets of anchoring cylinders move alternatively so that the bit pressure is nearly continuously applied to the drill bit. The bit pressure loading device can provide extra bit pressure which is up to 25kN-40kN to the drill bit under the condition that the previous bit pressure is not influenced, and a matched electro-hydraulic control system can guarantee stable operation of an execution element.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, in particular to an downhole stepping drilling pressure loader and a control method thereof. Background technique [0002] During conventional oil and gas drilling, the drill bit breaks the rock under the weight-on-bit formed by the gravity of the drill string to form a wellbore. Friction is greatly reduced, and the WOB effectively applied to the drill bit is extremely limited, resulting in reduced rock-breaking drilling efficiency and prolonged drilling time, which not only increases drilling costs, but also increases the probability of downhole accidents to a certain extent. In addition, the emerging drilling technology—coiled tubing drilling has attracted the attention of the industry due to its advantages such as fast moving equipment, high-efficiency operation technology, and short-radius horizontal well drilling. The method of connecting conventional drilling tools with pipes limits the...

AI Technical Summary

Problems solved by technology

However, foreign countries have always been in a state of technology monopoly, domestic scientific research institutions only do theoretical research and a small number of prototype trial production, it is difficult to adapt to the future development trend of drilling technology

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