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Rigid centering device

A technology of rigid centralizer and centralizing bar, which is applied in the direction of drilling equipment, earthwork drilling and production, drill pipe, etc., and can solve the problems affecting the rotary cementing process of rotary liner and casing, damage to the side of the centralizing rib, unfavorable casing rotation, etc. , to achieve the effect of improving cementing quality, protecting the well wall and facilitating rotation

Inactive Publication Date: 2018-03-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned centralizer has defects in liner rotation or casing rotation cementing.
During the rotation of the pipe string, the elastic centralizer is likely to cause damage to the main body, lose the centralizing effect, and easily lead to downhole centralizing accidents
Due to the high rigidity of the rigid centralizer, the centralizing ribs are easy to cause damage to the well wall, and when it is blocked, it is not conducive to the rotation of the casing, which affects the implementation of the rotary liner cementing and casing rotary cementing processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Southern shale gas well D194-1HD is drilled with oil-based mud, the friction coefficient of oil-based drilling fluid is 0.31, and the density is 1.45g / cm 3 ,The inclination angle was 87.5° when the drilling was completed, the horizontal section length was 1524.m, the inclination depth was 4460.0m, the vertical depth was 2784.0m, the kickoff point was 2220m, the drill bit size was 215.9mm, the casing outer diameter was 139.7mm, and the wall thickness was 12.34mm . The whole well adopts 188 rigid centralizers provided by the present invention, of which one centralizer is placed for each casing in the horizontal section and the high-inclination section, and one centralizer is placed for 3-4 casings in the vertical well section. In order to ensure the normal running of the casing, when the casing is lowered to the bottom of the well at 3001m, the casing is rotated with a rotational torque of 2400N·m, and when the casing is lowered to the bottom of the hole at 4460m, the cas...

Embodiment 2

[0029] A well in the Biyang Sag of Henan Oilfield, the well type is a vertical well, the drilling depth is 3100m, the drilling bit size is 215.9mm, the casing outer diameter is 139.7mm, the casing wall thickness is 9.17mm, and the drilling fluid density is 1.25g / cm 3 . The whole well adopts 72 rigid centralizers provided by the present invention, and one centralizer is placed in 4 casings in the vertical well section. After the casing is run in, the casing is rotated to realize rotary casing cementing. 3 / min Displacement During well washing, the casing is rotated with a rotation torque of 2600N m. During the cement sheath, the casing is rotated at 20 rpm to achieve rotary casing cementing. The rotation torque is 2870N m. After 7 days Solid quality and sound amplitude logging, the quality of the whole well is high.

Embodiment 3

[0034] A well in Xinjiang Tahe Oilfield, the well type is a vertical well, the drilling depth is 6300m, the drilling bit size is 215.9mm, the liner pipe outer diameter is 139.7mm, the casing wall thickness is 9.17mm, the liner length is 1109m, and the drilling fluid density at completion 1.45g / cm 3 . The whole well adopts 34 rigid centralizers provided by the present invention, and one centralizer is placed in three casings of the liner section. After the liner is run in, the casing is rotated to realize rotary casing cementing, and the 1.8m 3 / min Displacement During well washing, the casing is rotated with a rotation torque of 5200N m. During the cement sheath, the casing is rotated at 20 rpm to achieve rotary casing cementing. The rotation torque is 5700N m. After 7 days Solid quality and sound amplitude logging, the quality of the whole well is high.

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Abstract

The invention provides a rigid centering device. The rigid centering device is applied to a casing pipe, and comprises a barrel, centering strips and rotary wheels, wherein the barrel is in a hollow shape, the centering strips are arranged on the barrel in the axial direction, the rotary wheels are rotatably fixed to the interiors of the centering strips through rotary shafts, and the side walls of the rotary wheels penetrate through the side wall of the barrel. According to the rigid centering device, frictional force between rotation of the centering device and the well wall is reduced, therotating friction resistance of the casing pipe is greatly reduced, the casing pipe rotating function in the casing pipe tripping-in and well cementing processes is achieved, the casing pipe rotatingresistance is effectively reduced, a torque when the casing pipe rotates is reduced, normal rotation of the casing pipe is ensured, a screw thread of the casing pipe is protected, and meanwhile casingpipe rotation is prevented; and the centering degree of the casing pipe is ensured, implementation of a technology of rotary casing pipe well cementing and rotary tail pipe well cementing can be ensured, rotation of the casing pipe in the casing pipe tripping-in process can be ensured, and sticking of the casing pipe is prevented.

Description

technical field [0001] The invention relates to the technical fields of rotary liner cementing and casing rotary cementing, in particular to a rigid centralizer. Background technique [0002] Rotary liner cementing and casing rotary cementing are considered to be effective methods and means to improve cementing quality, especially for special wells such as deep wells, small gap wells, and irregular well diameters, and have good application effects. But so far there is no special centralizer for tailpipe rotation and casing rotation. [0003] At present, the centralizers used in well cementing mainly include elastic centralizers and rigid centralizers. Elastic centralizers are divided into single-bow centralizers and double-bow centralizers; rigid centralizers are further divided into: ordinary rigid centralizers, rigid swirl centralizers, Resin swirl centralizer, roller centralizer, etc. The use of the above-mentioned centralizer improves the centering of the casing and ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/10
CPCE21B17/1057
Inventor 陶谦张明昌谭春勤初永涛刘建
Owner CHINA PETROLEUM & CHEM CORP
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