Experimental study on sand production and coupling response of silty hydrate reservoir with different contents of fine clay during depressurization

IF 4.2 Q2 ENERGY & FUELS
Xiangyu Fang , Dianheng Yang , Fulong Ning , Linjie Wang , Zhichao Liu , Yanjiang Yu , Wenwei Xie , Hongfeng Lu , Yanlong Li , Meng Xu
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引用次数: 3

Abstract

To further understand the characteristics of clay and sand production (hereafter collectively referred to as sand production) and to provide optimization designs of sand control schemes are critical for gas production from clayey silt natural gas hydrate reservoirs in the South China Sea. Thus, gas-water-sand production behavoirs and coupling reservoir subsidence characteristics before, during, and after hydrate dissociation of the clayey silt hydrate reservoirs with different clay contents (5%, 10%, 15%, 20%, 25%, and 30%) have been studied through a self-developed experimental system. The results show that with the increase of clay content, the total mass of sand production first increases and then decreases, and it reaches maximum when the clayey content is 20%. The sand production is the lowest before hydrate dissociation and increases significantly during hydrate dissociation, which mainly occurs in the high-speed gas and water production stage at the beginning of hydrate dissociation. After hydrate dissociation, the sand production decreases significantly. During the whole depressurization process, the clay and free sand particles generally move to the sand outlet due to the fluid driving force and overlying stress extrusion. However, for conditions of high clay contents, those particles fail to pass through the sand control screen and gradually accumulate and block the screen by forming a mud cake, which greatly reduce the permeability of the screen and limite sand production as well as gas and water production. Our research lays a foundation for sand production prediction and sand control scheme selection during gas recovery from clayey silty hydrate reservoirs that greatly need to consider a balance between sand control and gas productivity.

不同细粘土含量粉质水合物储层减压产砂及耦合响应试验研究
为了进一步了解粘土和出砂(以下统称为出砂)的特征,并提供防砂方案的优化设计,对于从南海粘性淤泥质天然气水合物储层中开采天然气至关重要。因此,通过自行开发的实验系统,研究了不同粘土含量(5%、10%、15%、20%、25%和30%)的粘质粉土水合物储层在水合物分解前后的气水砂生产行为和耦合储层沉降特征。结果表明,随着粘土含量的增加,出砂总质量先增大后减小,当粘土含量为20%时,出砂总量达到最大值。水合物解离前出砂量最低,在水合物解离过程中出砂量显著增加,主要发生在水合物解离初期的高速产气和产水阶段。水合物分解后,出砂量显著下降。在整个降压过程中,由于流体驱动力和上覆应力挤压,粘土和自由砂粒通常会向出砂口移动。然而,在粘土含量高的条件下,这些颗粒无法通过防砂筛管,并逐渐积聚并堵塞筛管,形成泥饼,这大大降低了筛管的渗透率,限制了出砂以及产气和产水。我们的研究为粘土质粉质水合物油藏采气过程中的出砂预测和防砂方案选择奠定了基础,这些油藏需要考虑防砂和产气之间的平衡。
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来源期刊
Petroleum
Petroleum Earth and Planetary Sciences-Geology
CiteScore
9.20
自引率
0.00%
发文量
76
审稿时长
124 days
期刊介绍: Examples of appropriate topical areas that will be considered include the following: 1.comprehensive research on oil and gas reservoir (reservoir geology): -geological basis of oil and gas reservoirs -reservoir geochemistry -reservoir formation mechanism -reservoir identification methods and techniques 2.kinetics of oil and gas basins and analyses of potential oil and gas resources: -fine description factors of hydrocarbon accumulation -mechanism analysis on recovery and dynamic accumulation process -relationship between accumulation factors and the accumulation process -analysis of oil and gas potential resource 3.theories and methods for complex reservoir geophysical prospecting: -geophysical basis of deep geologic structures and background of hydrocarbon occurrence -geophysical prediction of deep and complex reservoirs -physical test analyses and numerical simulations of reservoir rocks -anisotropic medium seismic imaging theory and new technology for multiwave seismic exploration -o theories and methods for reservoir fluid geophysical identification and prediction 4.theories, methods, technology, and design for complex reservoir development: -reservoir percolation theory and application technology -field development theories and methods -theory and technology for enhancing recovery efficiency 5.working liquid for oil and gas wells and reservoir protection technology: -working chemicals and mechanics for oil and gas wells -reservoir protection technology 6.new techniques and technologies for oil and gas drilling and production: -under-balanced drilling/gas drilling -special-track well drilling -cementing and completion of oil and gas wells -engineering safety applications for oil and gas wells -new technology of fracture acidizing
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