Simulation Analysis of Wellbore Instability Considering the Influence of Hydration Effect on the Physical Properties of Brittle Shale

IF 0.6 4区 工程技术 Q4 ENERGY & FUELS Chemistry and Technology of Fuels and Oils Pub Date : 2024-07-22 DOI:10.1007/s10553-024-01723-9
Zhu Luo, Donglei Jiang, Chuanhua Ma, Kai Liu, Xin Yu
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Abstract

Shale gas, as an important unconventional oil and gas resource, its efficient development can alleviate the current severe energy demand situation. However, the water absorption and expansion characteristics and hydration effects of shale pose a great threat to the drilling safety of shale, mainly wellbore stability. Therefore, based on mechanical property experiments, the influence of hydration expansion on the mechanical property parameters of brittle shale was analyzed, and an evolution model of the mechanical property parameters of shale with hydration expansion was constructed. In addition, a finite element model for numerical simulation of wellbore stability in shale formations was established, and the effects of factors such as the addition of hydration inhibitors in drilling fluid on wellbore collapse were analyzed. Research has shown that the hydration and expansion of shale can reduce its elastic modulus and cohesive force, but the effect of hydration and expansion on Poisson’s ratio and internal friction angle shows the opposite pattern. After being immersed in drilling fluid for 12 hours, the elastic modulus of shale decreased from 5.3 GPa to 3.9 GPa, and the cohesion decreased from 4.6 MPa to 3.0 MPa. In addition, wellbore collapse and instability in shale mainly occur in the early stages of drilling operations, while wellbore collapse will significantly slow down in the later stages. The wellbore enlargement rate increased to 40% within the first three hours of drilling operations. Moreover, the addition of hydration inhibitors in drilling fluids will prevent further collapse of the wellbore by inhibiting the invasion of water. When the hydration inhibitor in the drilling fluid was increased from 0 to 45 g/m3, the wellbore enlargement rate decreased from 66.2% to 27.8%. This study can provide theoretical reference for maintaining wellbore stability and drilling safety during shale drilling.

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考虑水化效应对脆页岩物理性质影响的井筒不稳定性模拟分析
页岩气作为一种重要的非常规油气资源,其高效开发可以缓解当前严峻的能源需求形势。然而,页岩的吸水膨胀特性和水化作用对页岩的钻井安全(主要是井筒稳定性)构成了极大的威胁。因此,基于力学性能实验,分析了水化膨胀对脆性页岩力学性能参数的影响,构建了水化膨胀页岩力学性能参数演化模型。此外,还建立了页岩层井筒稳定性数值模拟的有限元模型,分析了钻井液中添加水化抑制剂等因素对井筒坍塌的影响。研究表明,页岩的水化膨胀会降低其弹性模量和内聚力,但水化膨胀对泊松比和内摩擦角的影响却呈现出相反的规律。在钻井液中浸泡 12 小时后,页岩的弹性模量从 5.3 GPa 降至 3.9 GPa,内聚力从 4.6 MPa 降至 3.0 MPa。此外,页岩的井筒坍塌和不稳定性主要发生在钻井作业的早期阶段,而井筒坍塌在后期阶段会明显减缓。在钻井作业的前三个小时内,井筒扩大率增加到 40%。此外,在钻井液中添加水合抑制剂可以抑制水的侵入,从而防止井筒进一步坍塌。当钻井液中的水化抑制剂从 0 克/立方米增加到 45 克/立方米时,井筒扩大率从 66.2%下降到 27.8%。该研究可为页岩钻井过程中保持井筒稳定和钻井安全提供理论参考。
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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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