Drill-In Fluid Optimization for Formation Damage Control Considering Salt Dissolution in Saline-Lacustrine Reservoirs

IF 3.2 3区 工程技术 Q1 ENGINEERING, PETROLEUM
SPE Journal Pub Date : 2023-11-01 DOI:10.2118/218018-pa
Qigui Tan, Bin Yang, Lijun You, Yili Kang, Haoping Peng, Fuquan Song, Chong Lin
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Abstract

Summary Salt dissolution induced by drill-in fluid loss is a frequent occurrence in saline-lacustrine reservoirs, which can potentially result in serious formation damage. In light of this, an experimental study was conducted to investigate the salt mineral dissolution and dynamic damage in the rock samples collected from a saline-lacustrine carbonate reservoir and the response of pore-fracture structures using the in-situ drill-in fluids. The study further involved analyzing the formation-damage-control (FDC) ability of the in-situ drill-in fluids. The results indicated that although salt dissolution significantly increased the pore size of the tight matrix and the width of natural fractures, improving the conductivity of seepage channels, the increase in pore-fracture size may have greatly aggravated the drill-in fluid loss during the process. The continuous serious filtrate loss, lower pressure-bearing capacity of the plugging zone, and lower permeability recovery rate (PRR) of rock indicated poor FDC performance of in-situ brine drilling fluids for the salt-dissolved core samples. The FDC performance of drill-in fluids for saline-lacustrine carbonate reservoirs was optimized based on the response of reservoir pore-fracture structure to salt dissolution and the theory of slightly underbalanced activity. The experimental results showed that the optimized drill-in fluids had better FDC ability, with an average PRR increase of 14.04%. Field application indicated that the optimized drill-in fluids reduced the drill-in fluid loss by 76.48%, shortened the drilling cycle by 45.20%, and increased the initial production capacity per well by 7.70%. This study can provide insightful guidance to optimize the FDC performance of drill-in fluids for saline-lacustrine hydrocarbon reservoirs during drilling.
考虑盐湖储层盐溶的入井钻井液防损优化研究
在盐湖储层中,钻入液漏失引起的盐溶是常见的现象,可能会导致严重的地层损害。在此基础上,利用原位钻进流体,对某盐湖相碳酸盐岩储层岩样中的盐矿物溶蚀、动态损伤及孔隙-裂缝结构响应进行了实验研究。研究进一步分析了原位钻井液的地层损害控制(FDC)能力。结果表明,盐溶作用虽然显著增大了致密基质的孔隙尺寸和天然裂缝宽度,提高了渗流通道的导流能力,但孔隙-裂缝尺寸的增大可能极大地加剧了钻井过程中的钻井液漏失。滤失持续严重,封堵区承压能力较低,岩石渗透率采收率(PRR)较低,表明原位盐水钻井液对盐溶岩心样品的FDC性能较差。基于储层孔隙-裂缝结构对盐溶蚀的响应和微欠平衡活性理论,对盐湖相碳酸盐岩储层钻进液的FDC性能进行了优化。实验结果表明,优化后的入井液具有较好的FDC能力,平均PRR提高14.04%。现场应用表明,优化后的入井液使入井损失量降低了76.48%,钻井周期缩短了45.20%,单井初始产能提高了7.70%。该研究对盐碱湖相油气藏钻井过程中钻井液FDC性能的优化具有指导意义。
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来源期刊
SPE Journal
SPE Journal 工程技术-工程:石油
CiteScore
7.20
自引率
11.10%
发文量
229
审稿时长
4.5 months
期刊介绍: Covers theories and emerging concepts spanning all aspects of engineering for oil and gas exploration and production, including reservoir characterization, multiphase flow, drilling dynamics, well architecture, gas well deliverability, numerical simulation, enhanced oil recovery, CO2 sequestration, and benchmarking and performance indicators.
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