Production schedule optimization of gas wells in W shale gas reservoir under controlled pressure difference based on numerical simulation

HE Feng; FENG Qiang; CUI Yushi

doi:10.13809/j.cnki.cn32-1825/te.2023.01.010

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Production schedule optimization of gas wells in W shale gas reservoir under controlled pressure difference based on numerical simulation
Issue 1, Pages: 91-99(2023)
Published：2023
DOI： 10.13809/j.cnki.cn32-1825/te.2023.01.010
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DOI：

HE Feng, FENG Qiang, CUI Yushi. Production schedule optimization of gas wells in W shale gas reservoir under controlled pressure difference based on numerical simulation[J]. Petroleum Reservoir Evaluation and Development, 2023, (1): 91-99. DOI： 10.13809/j.cnki.cn32-1825/te.2023.01.010.

摘要

页岩气藏大规模体积压裂形成复杂裂缝网络，开发过程中应力敏感效应导致页岩气井产量迅速降低。因此，需要开展应力敏感对页岩气井产量的影响规律及控压生产制度研究，进而确定合理生产压差，并优化生产制度。首先，基于嵌入式离散裂缝模型，对压裂后页岩气藏天然裂缝和压裂裂缝进行精确表征，建立页岩气井复杂缝网数值模拟模型。然后，分别研究了裂缝及基质不同应力敏感条件下的页岩气井产气量变化规律。最后，开展控压生产制度优化数值模拟研究，设定40组不同的生产压差方案，厘清生产压差与页岩气井产气量的规律，建立W页岩气藏A区块累产气量与生产压差的关系图，确定该区块最佳控压生产压差为14 MPa。研究结果表明，控压生产对优化页岩气井产量十分重要，可以降低应力敏感对产量的影响，控压生产制度优化方法及结果能够为页岩气井生产提供指导。

Abstract

The complex fracture networks are often formed after large-scale hydraulic fracturing in shale gas reservoirs

and the shale gas production rates decrease quickly due to the stress sensitivity. Therefore

it is necessary to study the influence of the stress sensitivity and production schedule under the controlled pressure for shale gas wells to determine the reasonable pressure drop and optimize the production schedule. Firstly

the natural and hydraulic fractures in shale gas reservoir are accurately characterized based on the embedded discrete fracture model（EDFM）

and the numerical simulation models of the shale gas wells based on the complex fracture networks are established. Then

the gas production performance of shale gas wells under different stress sensitivity conditions of fractures and matrix are analyzed. Finally

the numerical simulation on the production schedule optimization under the controlled pressure is performed. Forty groups of different production pressure schemes are designed to clarify the relationship between production pressure and performance of shale gas wells. The relationship curves of the accumulative gas and production pressure are established for Block A of W shale gas reservoir

and the optimal production pressure drop under controlled pressure is determined to be 14 MPa. The results show that the production under the controlled pressure is important for enhancing the production of shale gas wells and can reduce the influence of stress sensitivity on gas production. The optimization method and results of the production schedule under the controlled pressure can provide guidance for the production optimization of the shale gas wells.