Vertical well drilling automatic adjusting device and adjusting method

Abstract

The invention discloses a vertical well drilling automatic adjusting device, which is characterized in that a rooftop arranged at a top layer and a secondary platform connected to the middle of a derrick in a sleeving manner are respectively arranged on the derrick, a guide platform is placed on a wellhead and positioned on the central line of the derrick, and a six degree of freedom parallel adjusting platform is arranged at the height position between the guide platform and a downhole bit; a reducer driven by a diesel engine is fixedly arranged on the rooftop, and the output end of the reducer is set to be a roller wound with a steel wire rope; a surface rotation driving mechanism is suspended on the steel wire role, and can move up and down under the driving of the reducer; the output end of the surface rotation driving mechanism is connected to the joint of a drill stem by a threaded-connected coaxial connector to drive the drill stem to rotate. The vertical well drilling automatic adjusting device is large in drilling pressure adjusting range, strong in operational reliability, and capable of achieving vertical well drilling under the conditions of heavy load and high speed.

Description

technical field [0001] The invention relates to a vertical drilling adjustment device and an adjustment method in the technical field of drilling. Background technique [0002] Vertical drilling has the advantages of reducing the casing layer and casing size, increasing the ROP, and reducing drill string accidents. There are many factors affecting well deviation during drilling, and well deviation will bring a series of hazards to operations such as drilling and completion. [0003] At present, the pendulum drilling tool is the most widely used declination tool in China. Since its declination mechanism is the "pendulum effect", it is more effective when used in large well deviations than in small well deviations. However, there are disadvantages: its working WOB range is small, and it can only be hoisted with light pressure. At the same time, under the condition of high shaking structure, the large formation deflection force is enough to offset the deflection force and main...

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Problems solved by technology

However, the disadvantages are: its working weight-on-bit range is small, and it can only be hoisted with light pressure. At the same time, under the condition of high shaking structure, the large formation deflection force is enough to offset the deflection force and maintain the deflection increase.

However, the increased torque resistance due to the use of large near-bit stabilizers all over the hole inevitably increases the risk of differential pressure sticking and tool failure

Well deviation problems are very common in steep structural areas in China, and there have been no related reports on automatic adjustment devices and detection methods that can be effectively applied to vertical drilling in large deep wells

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