Method for casing pipe downward running operation through casing pipe driving head

Abstract

The invention discloses a method for conducting casing pipe downward running operation through a casing pipe driving head. the method comprises the steps that a first casing pipe is lifted up, and is clamped to the interior of a rotating plate, and the casing pipe driving head is then connected to a drilling tool; the casing pipe driving head is inserted into the first casing pipe to ensure that a clamping tile on the casing pipe driving head is locked on the inner diameter of the first casing pipe; the clamping tile of the casing pipe is taken out, a square drilling rod is inserted into the rotating plate, and a pump is started to carry out casing pipe drilling until drilling of the first casing pipe is finished; unlocking is carried out to release the clamping tile on the casing pipe driving head, and the casing pipe driving head is lifted out; a second casing pipe is lifted up through a clamping lifter again, and is inserted into the first casing pipe arranged in the rotating plate in a clamped mode; the casing pipe driving head is then inserted into the second casing pipe to ensure that the clamping tile on the casing pipe driving head is locked on the inner diameter of the second casing pipe, the second casing pipe runs downwards until the second casing pipe reaches the bottom of a well, and the pump is started to carry out casing pipe drilling until the second casing pipe is completely drilled. The method for conducting casing pipe downward running operation through the casing pipe driving head can improve the downward running capability of the casing pipes in the complex well and casing pipe downward running safety and reduce operation risks.

Description

technical field [0001] The invention relates to a method for running a casing operation by using a casing driving head, which is used for oil and gas drilling with the casing. Background technique [0002] In the process of conventional oil and gas drilling, due to the geological characteristics of the formations in various places, downhole complex situations such as borehole diameter shrinkage, well wall collapse, keyway and lost circulation caused by drilling tools in drilling often occur. In this case, after the completion of drilling When implementing casing running and cementing rotation, some wells will encounter resistance and jamming, and some even have problems such as the casing cannot be lowered to the predetermined depth. When these situations occur, the construction will not meet the requirements of engineering design, and some There will also be safety accidents in the casing running process, resulting in increased operating risks, increased costs, and extended...

AI Technical Summary

Problems solved by technology

But this type of technology also has the following disadvantages: one, the CN200320127812.X patent must open the mud pump in the working state to transport the mud downward through the tube cavity in the center of the main shaft as the power to push the piston down, and the whole device does not have a locking mechanism. This method makes the drive head The working condition of the mud pump is directly restricted by the mud pump. If the pump pressure of the mud pump is unstable, it will easily cause work failure, and it is necessary to control the pump pressure well.

2. The CN200320127812.X patent is a method of using a return spring to separate the slip teeth from the casing. This method has the problem of return spring fatigue and incomplete reset when the strength is reduced; the slope contact area between the piston and the slip may also be due to The situation where the pump pressure is too high to cause mutual adhesion and cannot be separated

3. The expansion and reset control of slips in CN200320127963.5 patent is controlled by a large nut drive device. Although this method can lock and control the slips, the operation is cumbersome; the multi-slope structure of the sliding key has no guiding device, resulting in slips In the process of expansion and reset, there is a phenomenon that it cannot be centered, jammed or locked firmly

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