Straight-wing type resin casing centralizer and its installation method
An installation method and centralizer technology, applied in the direction of casing, epoxy resin glue, drill pipe, etc., can solve the problems of lack of centering of small casing, large friction resistance and small friction coefficient during casing running , to achieve the effect of good paste stability, high precision and small error
Active Publication Date: 2022-05-20
中石化石油工程技术服务有限公司 +2
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Problems solved by technology
[0003] Existing casing centralizers mainly include: spring-type centralizers, rigid centralizers and semi-rigid centralizers, mainly relying on mechanical support, high friction resistance and high risk of resistance during casing running, and none of them have a fixed casing in the casing Technical requirements for small casings with high centering and low friction coefficient in small gap operations
Method used
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[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.
[0026] Such as Figure 1-5 As shown, a straight-wing resin casing centralizer includes two pieces installed on the left and right ends of the 3.5" casing, which are distributed at 90 degrees on the circumference. The staggered placement has no effect on the annular flow area and reduces friction. Install 2 pieces 2.05m away from the male buckle section, with a distance of 30cm, and place them relatively; The centralizing strip and the fourth centralizing strip are relatively distributed around a single casing, in which the two pieces at the left end are 180° relative to each other, the two pieces at the right end are 180° opposite to each other, and the left and right ends are correspondingly 90°, and the overall shape ...
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Abstract
The invention relates to a straight-wing type resin casing centralizer and an installation method thereof. The straight-wing type resin casing centralizer comprises a first centralizing strip, a second centralizing strip, a second The three righting strips and the fourth righting strips, the first righting strips, the second righting strips, the third righting strips and the fourth righting strips are arranged staggeredly at an angle of 90° on the circumference. The invention is a supporting tool for the development of the special casing centralization process for domestic shale gas old well reconstruction wellbore. The resin centralizer can be manually pasted on the 3.5" casing to meet the technical requirements for re-running the 3.5" casing in the horizontal well with 5.5" casing. It has the advantages of It has the characteristics of good paste stability, high centering, low friction, and good penetration of perforating bullets. It is easy to operate, high in accuracy, small in error, safe and reliable, and can be directly applied to field operations and construction.
Description
technical field [0001] The invention relates to the field of centering and centralizing small-sized casings in shale gas reconstruction well bores, and more specifically relates to a straight-wing type resin casing centralizer and an installation method thereof. Background technique [0002] Existing shale gas wells generally adopt a pressurized and intermittent development mode, and the production declines rapidly, making it difficult to increase and stabilize production in gas fields. Refracturing of conventional shale gas wells generally adopts full wellbore temporary plugging and diversion technology, but the effect is not good due to factors such as serious reservoir leakage, enhanced heterogeneity, and local over-stimulation. Restoration of wellbore refracturing technology restores wellbore integrity and reduces leakage through casing-in-casing, and uses bridge plugs to segment and evenly transform horizontal sections to increase the scale of stimulation, realize preci...
Claims
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IPC IPC(8): E21B17/10C09J163/00C09J163/02
CPCE21B17/1078C09J163/00Y02E30/30
Inventor 袁发勇豆瑞杰苏浩汪鹏张驰蒋成白胡毅明月李强廷亮石陈梅蒋嫚黎江明钟兵李炜
Owner 中石化石油工程技术服务有限公司