Completion technology of heavily stressed and tight sandstone gas reservoirs in Xujiahe formation in west Sichuan depression
Keywords:
aftereffect perforation, breaking down processAbstract
The Xujiahe high stress tight reservoir in western Sichuan has high fracture pressure, low transformation displacement, and high safety risk of testing strings. Through sorting and analyzing the well system of the previous reservoir transformation, a set of technologies suitable for tight reservoir fracturing transformation has been developed from the aspects of wellhead pressure limiting, fracture reduction technology, testing strings, and tool structure. The D201 well adopts a 140 MPa wellhead device to increase the construction pressure to 120 MPa, which is 25MPa higher than the 105MPa wellhead. This solves the problems of low wellhead pressure limit and high difficulty in adding sand; The M2 well adopts post effect perforation technology to improve the flow pattern near the wellbore of high fracture pressure wells, effectively improving the compressibility of the reservoir; Well X5 adopts Ф 114. 3 mm+ Ф88. 9 mm large-sized oil pipes equipped with high-strength tools improves the construction displacement and string safety, meeting the transformation needs of high displacement, large liquid volume, and high construction pressure in high stress and tight reservoirs. The successful application of this technology provides a new approach for testing high stress and tight reservoirs, while also providing technical support for releasing reservoir productivity. © 2023 Well Testing. All rights reserved.
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