玛湖401井区承压封堵钻井液体系优化研究

doi:10.11885/j.issn.1674-5086.2023.05.17.06

摘要/Abstract

摘要： 针对玛湖401井区三开白碱滩组水平段钻遇微裂缝发育地层，存在“先漏后出”、“漏出同层”，大幅度提高承压能力存在难度大、成功率低等问题进行研究。研究发现，白碱滩组岩层具有渗透性强、微裂缝发育的特性，在井深、应力及外力不断增加的条件下容易产生细微裂缝，在钻井液滤液侵入井壁后，井壁微裂缝继续扩张，导致井漏等复杂事故频发。鉴于玛湖401井区白碱滩组取样岩芯的裂缝宽度在1~30 μm，室内采取了多级微米级封堵材料进行优选，结合其他处理剂的优选，建立了一套适合该井区的承压封堵水基钻井液体系及配套施工工艺。应用表明：试验井最大漏速、漏失量及堵漏次数都显著降低，说明封堵材料形成了有效密封段塞，从而提高了地层承压能力，其防漏、堵漏效果显著。

关键词: 玛湖401井区, 微纳米封堵, 承压能力, 防漏堵漏, 水基钻井液

Abstract: This paper focuses on the problems such as “leakage before flowback” and “leakage in the same layer” when drilling in the horizontal member of Sankai Baijiantan Formation in Mahu 401 Well area, which makes it difficult to greatly improve the pressure bearing capacity. It is found that the Baijiantan Formation has the characteristics of strong permeability and micro-fracture development, and it is easy to produce micro-cracks with the increasing well depth, stress and external force. After the intrusion of drilling fluid filtrate into the well wall, micro-cracks continue to expand, resulting in frequent complications such as well loss. Considering that the crack width of the sampled core of Baijiantan Formation in Mahu 401 Well Area ranges from 1 to 30 μm, multi-micron grade plugging materials are used for optimization, and combined with the optimization of other treatment agents, a set of pressure plugging water-based drilling fluid system and supporting construction technology suitable for this well area are established. The application shows that the maximum leakage velocity, leakage volume and plugging times of the test well are significantly reduced, which indicates that the plugging material has formed an effective sealing and plugging slug, thus improving the pressure bearing capacity of the formation, and its leakage prevention and plugging effect is remarkable.

Key words: Mahu 401 Well Area, micro-nano plugging, bearing capacity, leak resistance and sealing, water-based drilling fluid

中图分类号:

TE254.6

周泽南, 王路一, 戎克生, 任涛, 柳新国. 玛湖401井区承压封堵钻井液体系优化研究[J]. 西南石油大学学报(自然科学版), 2025, 47(3): 124-134.

ZHOU Zenan, WANG Luyi, RONG Kesheng, REN Tao, LIU Xinguo. Optimization of Pressure-bearing and Plugging Drilling Fluid System in Mahu 401 Well Area[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(3): 124-134.

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http://journal15.magtechjournal.com/Jwk_xnzk/CN/Y2025/V47/I3/124

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