Development and prospect of support technology of slim hole sidetrack horizontal well for Sulige tight sandstone gas reservoir

doi:10.3969/j.issn.1672-7703.2023.02.012

Abstract

Abstract: Given the complex geological characteristics of Sulige Gasfield, such as multi-layer gas bearing in vertical and strong reservoir heterogeneity in lateral, technology research and field practice of sidetrack horizontal well have been conducted in Sulige Gasfield since 2011, so as to tap the remaining reserves in mature areas and ensure the high-efficiency and stable production of gas field. As a result, a series of supporting technologies, including remaining gas characterization, well location selection, drilling and completion, reservoir reconstruction, and drainage gas recovery, have gradually been improved, and a set of mature sidetrack horizontal well development technologies has been researched for tight sandstone gas reservoir in Sulige Gasfield. By the end of June 2022, 57 wells had been drilled, with the average horizontal section increased from 614.2 m to 753 m, drilling cycle decreased from 63.7 days in the initial stage to 35 days, a decrease of 45.1%, and well completion period decreased from 91.5 days to 52.6 days, a decrease of 42.5%. The cased-hole completion and bridge plug staged fracturing by using φ88.9 mm casing were achieved for the first time in 2021, with a success rate of 100%. Till now, 42 wells have been put into production, with the average wellhead pressure increased from 9.4 MPa to 13.3 MPa, average gas rate increased from 2.0×10⁴m³/d to 4.0×10⁴m³/d of a single well in the first month, and the internal rate of return remained higher than 8%, showing significant economic benefits. Targeting at the goal of cost reduction and production increase, further technology research will be conducted focusing on the diversified design, intelligent development, integrated collaboration, and full-life cycle management. The technology of slim-hole sidetrack horizontal well drilling provides technical support for the beneficial development of Sulige tight sandstone gas reservoir in the late stage and technical reference and solutions for the high-efficiency production of remaining oil and gas in other oilfields.

CLC Number:

TE243.2

Ye Chenglin. Development and prospect of support technology of slim hole sidetrack horizontal well for Sulige tight sandstone gas reservoir[J]. China Petroleum Exploration, 2023, 28(2): 133-143.

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