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Integral type casing centralizer and manufacturing method thereof

A centralizer and integral technology, which is applied in the field of oil and gas well cementing, can solve the problems that are difficult to satisfy high-inclination directional wells and horizontal wells, the reset force of elastic casing centralizers is low, and the danger of obstruction in the necking section of the wellbore, etc. problems, to achieve the effect of good adaptability, high yield and strong applicability

Inactive Publication Date: 2016-11-23
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The elastic casing centralizer has the disadvantages of low reset force and difficulty in running in. If the reset force and centering effect on the casing are improved by increasing the number of runs, it will affect the safety of the wellbore. Therefore, it is already difficult to meet the high-inclination The needs of directional wells and horizontal wells; because the outer diameter of the rigid casing centralizer is limited by the inner diameter of the upper casing, it has a limited effect on the casing centering, so it cannot play a centralizing role in the wellbore expansion section, but in the wellbore necking danger of being blocked

Method used

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  • Integral type casing centralizer and manufacturing method thereof
  • Integral type casing centralizer and manufacturing method thereof
  • Integral type casing centralizer and manufacturing method thereof

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Embodiment Construction

[0067] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0068] In order to solve the deficiencies of existing casing centralizers, the present invention adopts the following technical solutions: the integral centralizer is processed by blanking of uniform wall thickness material pipes or plates, and the two ends of the body are cylindrical circles. hoop; between the hoops at both ends, there are limbs for supporting and centralizing evenly distributed in the circumferential direction, and the outer diameter of the centralizer formed by the limbs is smaller than or equal to the inner diameter of the upper casing; the shape and cross-sectional shape of the limbs have various changes according to the use function Structure: the shape of the limbs is drum-shaped, isosceles trapezoidal, spiral, etc., and the cross-sectional shape is arc-shaped, bent, and rectangular; The circular arc is transitioned, and the centralizer bow and t...

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Abstract

The invention provides an integral casing centralizer and a manufacturing method thereof, belonging to the field of oil and gas well cementing. The integral casing centralizer is processed by uniform wall thickness material pipe or plate, including hoops at both ends, and limbs located between the hoops at both ends; the limbs are evenly distributed on the circumference, and each The two ends of each limb are respectively connected with the hoops at both ends; each limb is arched outward; the outer diameter of the centralizer formed by all the limbs is smaller than or equal to the inner diameter of the upper casing.

Description

technical field [0001] The invention belongs to the field of oil and gas well cementing, and in particular relates to an integral casing centralizer and a manufacturing method thereof, which can be used for horizontal well and directional well cementing operations. Background technique [0002] After oil and gas wells are drilled, casings need to be lowered for cementing operations. Now, with the development of directional drilling technology and high-inclination well drilling technology, it is very important to improve the cementing quality of directional wells, high-inclination wells, and horizontal wells. As one of the key technical issues affecting the development of directional well technology, the problem of casing straightening in small gap cementing is also a prominent problem affecting the quality of cementing. To a large extent, the quality of cementing depends on the centering degree of the casing in the wellbore, and the centering degree of the casing in the well...

Claims

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Application Information

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IPC IPC(8): E21B17/10B23P15/00
Inventor 李富平刘明郭朝辉阮臣良吴姬昊袁大勇徐飞苏同
Owner CHINA PETROLEUM & CHEM CORP
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