An Open-hole Wall Support Technology Based on Multi-material Composite String and Its Application

doi:10.11885/j.issn.16745086.2021.04.30.05

Abstract

Abstract: The use of sidetracking technology for completed ultra-deep open-hole horizontal wells is one of the main means to develop the remaining oil economically and efficiently. The traditional milling steel casing sidetracking technology has some problems, such as large running friction and long milling time and so on. Therefore, an ultra-deep horizontal well open-hole wall support technology based on multi-material composite pipe string is proposed, combined with the well conditions of the ultra-deep open-hole horizontal well that has been drilled in the Northwest Oilfield in China. The paper firstly proposes a multi material composite string combination and design method based on “aluminum alloy + carbon steel”. Secondly, the applicability evaluation of the critical buckling load calculation model based on the actual buckling test data of the string is carried out, and the buckling critical load calculation model suitable for “aluminum alloy + carbon steel” multi material composite string is optimized; thirdly, the trip-ability analysis software of multi material composite string is developed, which comprehensively considers the torque, friction, rigidity, borehole conditions, string strength and material. The feasibility evaluation of composite string of Shunbei X1, X2, X3 and X4 wells in Northwest Oilfield is evaluated by using the trip-ability analysis software. The technology has been successfully applied in Well X1 and Well X2, which further demonstrates the feasibility of field application of the technology. The result provides a theoretical reference for the design of composite string of ultra-deep openhole horizontal wells wall support and trip-ability evaluation.

Key words: ultra-deep open-hole horizontal well, aluminum alloy, composite string, trip-ability, field application, wall support

CLC Number:

TE242

HUANG Liang, DENG Kuanhai, WANG Sen, FU Hao, LIN Yuanhua. An Open-hole Wall Support Technology Based on Multi-material Composite String and Its Application[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 157-166.

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http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2021/V43/I4/157

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