Experimental Study on Damage and Control Methods of Fracturing Fluid Retention to Tight Shale Matrix

IF 0.6 4区 工程技术 Q4 ENERGY & FUELS Chemistry and Technology of Fuels and Oils Pub Date : 2024-02-13 DOI:10.1007/s10553-024-01634-9
Chun Meng, Chengjun Liu, Ye Zhang, Zhiping Zhang, Jianqiang Zhang, Linzhi Li
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Abstract

The tight shale matrix has the structural characteristics of low porosity and low permeability. It is easy to cause water sensitivity damage, water lock damage and solid phase damage during fracturing, which greatly affects the gas reservoir transportation process of core. At the same time, fracturing fluid will invade the reservoir matrix, causing permeability damage and reducing gas production efficiency. This study analyzes the process and mechanism of fracturing fluid damage to shale matrix in the process of fracturing fluid retention, and proposes fracturing fluid damage control methods. Taking a tight sandstone reservoir in the ZJ block in South Sichuan as the research object, the mineral type, viscosity content and various physical parameters of shale gas reservoir are analyzed, and the quantitative index of fracturing fluid damage index is calculated. Using HPG as the precursor fluid, KW-1 and KDF as the drainage aids to prepare the fracturing fluid for experiment, the viscosity of the gel breaker reached 1.3 mPa·s, the interfacial tension between the gel breaker and kerosene reached 1.05 mN/m, and the surface tension was 22.8 mN/m. The fracturing fluid has good flowback performance. By collecting 4 core samples from ZJ block, the gas permeability of core samples is selected as three permeability sections 0.05·10–3 μm2, 0.15·10–3 μm2 and 0.25·10–3 μm2. And the correlation experiments of water sensitive damage, water lock damage and solid damage are carried out. The results show that when the permeability of the fracturing fluid decreases from 0.25·10–3 μm2 to 0.05·10–3 μm2, the damage value of the permeability section of the JS experimental group also increases from 8.25% to 18.35%, the movable water retention also increases from 0.032 PV to 0.046 PV, and the bound water increase increases from 0.032 PV to 0.086 PV. Therefore, the smaller the osmotic pressure is, the greater the retained amount of movable water and the increased amount of bound water are, and the greater the damage value of fracturing fluid is. In addition, when the mass fraction of XJHX in this experiment reaches 0.8%, its anti-swelling rate can reach 85%, which has excellent anti-swelling performance and can effectively reduce the permeability damage caused by fracturing fluid to shale formation.

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致密页岩基质压裂液截留损伤与控制方法实验研究
致密页岩基质具有低孔隙度和低渗透率的结构特征。在压裂过程中容易造成水敏破坏、锁水破坏和固相破坏,极大地影响气藏岩心的运移过程。同时,压裂液会侵入储层基质,造成渗透率破坏,降低产气效率。本研究分析了压裂液滞留过程中压裂液对页岩基质损伤的过程和机理,并提出了压裂液损伤控制方法。以川南ZJ区块致密砂岩储层为研究对象,分析了页岩气储层的矿物类型、粘度含量及各种物理参数,计算了压裂液损伤指数的定量指标。以HPG为前驱液,KW-1和KDF为助排剂配制压裂液进行实验,破胶剂粘度达到1.3 mPa-s,破胶剂与煤油的界面张力达到1.05 mN/m,表面张力为22.8 mN/m。压裂液具有良好的回流性能。通过采集 ZJ 区块的 4 个岩心样品,选取岩心样品的气体渗透率为 0.05-10-3 μm2、0.15-10-3 μm2、0.25-10-3 μm2三个渗透率段。并进行了水敏破坏、锁水破坏和固体破坏的相关实验。结果表明,当压裂液的渗透率从0.25-10-3 μm2降低到0.05-10-3 μm2时,JS实验组渗透段的破坏值也从8.25%增加到18.35%,动水滞留也从0.032 PV增加到0.046 PV,束缚水增加从0.032 PV增加到0.086 PV。因此,渗透压越小,活动水的保留量和结合水的增加量就越大,压裂液的破坏值也就越大。此外,当本实验中 XJHX 的质量分数达到 0.8%时,其抗溶胀率可达 85%,具有优异的抗溶胀性能,可有效降低压裂液对页岩地层造成的渗透率破坏。
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来源期刊
Chemistry and Technology of Fuels and Oils
Chemistry and Technology of Fuels and Oils 工程技术-工程:化工
CiteScore
0.90
自引率
16.70%
发文量
119
审稿时长
1.0 months
期刊介绍: Chemistry and Technology of Fuels and Oils publishes reports on improvements in the processing of petroleum and natural gas and cracking and refining techniques for the production of high-quality fuels, oils, greases, specialty fluids, additives and synthetics. The journal includes timely articles on the demulsification, desalting, and desulfurizing of crude oil; new flow plans for refineries; platforming, isomerization, catalytic reforming, and alkylation processes for obtaining aromatic hydrocarbons and high-octane gasoline; methods of producing ethylene, acetylene, benzene, acids, alcohols, esters, and other compounds from petroleum, as well as hydrogen from natural gas and liquid products.
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