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Casing pipe driving head suitable for casing pipe well drilling

A casing drive head and casing drilling technology, which is applied in the direction of drilling drive devices, casings, drilling equipment, etc. Ability, increased safety, reduced mutual swing effect

Active Publication Date: 2013-12-11
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Casing pipe driving head suitable for casing pipe well drilling
  • Casing pipe driving head suitable for casing pipe well drilling
  • Casing pipe driving head suitable for casing pipe well drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A casing driving head suitable for casing drilling, including a variable button joint 1, a guiding locking mechanism and a righting sealing mechanism; the guiding locking mechanism cooperates with the casing to lift, lower and rotate the casing; the The righting and sealing mechanism is used to guide and straighten the guiding and locking mechanism that is lowered into the casing and seal the drilling fluid; the variable button joint 1, the guiding and locking mechanism and the righting and sealing mechanism are sequentially connected from top to bottom.

[0042] In the present invention, the guiding and locking mechanism includes a central shaft 2 and slips 5 sleeved on the central shaft 2, and the central shaft 2 cooperates with the casing through the slips 5 for lifting, lowering and rotating the casing.

[0043] In the present invention, the central shaft 2 includes a positioning section 11 and a driving section 13 from top to bottom. The positioning section 11 is fi...

Embodiment 2

[0054] The invention includes a variable button joint 1, a guiding and locking mechanism, and a righting sealing mechanism;

[0055] The guiding and locking mechanism includes the central shaft 2, the positioning key 4, the slips 5, the driving key 6 and the lower joint 7. One end of the central shaft 2 is a male buckle, and the other end is a female buckle. The male buckle and the female buckle end of the central shaft 2 Positioning keyway 15 and driving keyway 16 are respectively provided with, positioning key 4 is arranged in positioning keyway 15, driving key 6 is arranged in driving keyway 16, positioning key 4 is fixed in positioning keyway 15 by fixing bolt 3, driving key 6 The fixed bolt 3 is fixed in the driving keyway 16; the slip 5 is set on the outer circle of the central shaft 2, and the slip 5 is a cylindrical structure, one end of the slip 5 is the snap tooth 12, and the other end is the slip lifter. The shoulder 14 is provided with a slip keyway 18 and a gap 17...

Embodiment 3

[0064] The centralizing sealing mechanism in the present invention can also be used in casing driving heads of other structures. When the casing driving head needs to be used in the downhole, under the guidance of the centralizing sealing mechanism, the casing driving head will enter the casing smoothly. It will play the role of guiding and straightening in the casing. Under the action of the centralizing edge, the centralizer on the inner wall can reduce casing wear, remove cuttings during drilling, and straighten the casing driving head so that the casing driving head is in the casing. The position inside the pipe is in the middle position, so that the sealing ring 8 can achieve the best sealing effect, and prevent the sealing failure caused by the eccentricity of the sealing ring 8, as well as the outflow of downhole circulating mud; The centering function of the mechanism, the sealing ring 8 is in the middle position in the casing, which can seal the inner wall of the ...

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Abstract

The invention discloses a casing pipe driving head suitable for casing pipe well drilling. The casing pipe driving head comprises an adapter connector, a guiding and locking mechanism and a centering and sealing mechanism. The guiding and locking mechanism is matched with a casing pipe for lifting, dropping and rotating the casing pipe. The centering and sealing mechanism is used for guiding and centering the guiding and locking mechanism inside the set casing pipe and sealing drilling fluid. The adapter connector, the guiding and locking mechanism and the centering and sealing mechanism are sequentially connected from top to bottom. By adopting the casing pipe driving head, the setting ability of the casing pipe inside a complex well can be improved, the safety of the set casing pipe can be improved, and operating risk can be lowered.

Description

technical field [0001] The invention relates to a casing driving head suitable for casing drilling, which is used for oil and gas drilling with casing, and belongs to the technical field of design and manufacture of drilling equipment. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/20E21B4/02E21B17/02E21B17/10E21B19/10
Inventor 李伟成陈晓彬陈立陈文才刘彬邓元洲胡畔周刚冯明
Owner BC P INC CHINA NAT PETROLEUM CORP
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