Application of Continuous Pack-off Technology in Packing-off Mudstone of Horizontal Well

doi:10.11885/j.issn.1674-5086.2020.07.03.02

Abstract

Abstract: In horizontal well drilling, mud blocking often occurs due to mudstone. The traditional packer is poor in function, and is restricked to specific condition. The laboratory physical simulation experimental materials for the application of continuous pack-off technology for anti-mud blocking are found during literature research. Though analyzing the feasibility of continuous pack-off technology for anti-mud blocking in production and factors influencing the application effect, the relative theory and computing method are proposed. The first application of continuous pack-off technology for anti-mud blocking is carried out, with an adjustment well in LF Oilfield as the first testing well. Since the well is on, the liquid productivity fluctuation is less than 4.8%. Comparing to the adjacent wells which did not drill through any mudstones, the fluid productivity index per meter is similar, only 2.02% difference to the average. All these evidences show that the technique has a great application effort on mud blocking prevention. It demonstrates that there are extensive application prospects for horizontal wells using continuous pack-off technology to prevent mud-blocking and keep efficient development.

Key words: horizontal well, mud migration, screen plugging, continuous pack-off, anti-mud blocking

CLC Number:

TE35

LI Feng, LI Xiaoping, YANG Yong, LIU Chenglin, PEI Bailin. Application of Continuous Pack-off Technology in Packing-off Mudstone of Horizontal Well[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(1): 121-131.

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