The Mechanism of Sand Production under the Alternating Injection-Production Mode of Gas Storage in Xinjiang MH Gas Reservoir

doi:10.12388/j.issn.1673-2677.2024.02.007

Abstract

Abstract:

The MH gas reservoir in Xinjiang has been through many years of depletion recovery. In order to meet the seasonal peak demand，the depleted gas reservoir is being reconstructed into an underground gas storage （UGS）. Due to alternating gas injection-production，the reservoir is prone to sand production during the injection-production process，which impacts on the operation and stability of the UGS. In order to clarify the mechanism of sand production under the alternating injection-production mode of the UGS，this paper used the reservoir cores to carry out the physical property，rock mechanics and alternating flooding experiments. The main composition，cementation and mechanical properties of the cores were analyzed，and the effects of drawdown pressure，confining pressure and alternating injection-production process on sand production were investigated. The experiment results show that the reservoir skeleton presents dissolution sericitization，high kaolinite content in clay minerals，weak mechanical strength properties，and has the risks of sand production under the UGS operating conditions. During cyclic injection and production，an increase in drawdown pressure promotes sand production. When the drawdown pressure exceeds 6 MPa，the rock reaches a critical state of sand production. Increasing confining pressure leads to premature sand production. Moreover，as the confining pressure rises，sand production first increases and then decreases. The extrusion of pore channels is the main driver for the decrease in sand production. In comparison to conventional gas production，the amount of produced sand during the alternating injection-production exhibits a wave-like pattern. The dynamic erosion process and fatigue failure of cementation，induced by multiple rounds of alternating injection-production，are the main contributors to exaggerate sand production from the UGS.

Key words:

gas storage, sand production mechanism, alternating injection-production, sand production experiment, depleted gas reservoir

摘要：

新疆MH气藏经过多年衰竭式开采，为保障季节调峰需求，现将衰竭气藏改建储气库。受储气库交变注采的影响，注采气过程中储层易发生出砂，对储气库的运行及稳定具有一定的影响。针对储气库交变注采模式下的出砂机理，采用储层岩心开展物性、岩石力学与交变驱替实验，分析了岩心主要成分、胶结情况及力学性质，探究了生产压差、围压和交变注采过程对出砂的影响。实验研究结果表明，储层骨架间具有溶蚀绢化现象，黏土矿物中高岭石含量高，力学强度性质较弱，在储气库工况下有发生出砂的风险。在循环注采条件下，生产压差的增加促进了砂的产出，当生产压差超过6 MPa时，岩石处于临界出砂状态。围压的增加导致了出砂的提前，随着围压的升高，出砂量先增大后减少，孔隙通道的挤压是引发出砂量降低的主要因素。交变注采与常规采气相比，阶段出砂量呈现波浪式变化。多轮次交变注采引发的冲蚀过程和胶结疲劳破坏是加剧储气库出砂现象的主要因素。

关键词:

储气库, 出砂机理, 交变注采, 出砂实验, 衰竭气藏

CLC Number:

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TE375

TIAN Shouceng, ZHANG Wenhong, WENG Jintao, GUAN Ziyue, WANG Jianbo, LIU Dunqing.

The Mechanism of Sand Production under the Alternating Injection-Production Mode of Gas Storage in Xinjiang MH Gas Reservoir

[J]. Xinjiang Oil & Gas, 2024, 21(2): 56-.

田守嶒, 张文宏, 翁锦涛, 关子越, 王剑波, 刘敦卿.

新疆MH气藏改建储气库交变注采出砂机制

[J]. 新疆石油天然气, 2024, 21(2): 56-.

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