低渗透各向异性油藏菱形井网储量动用评价及设计优化

doi:10.11743/ogg20210519

Abstract

Abstract:

Determining a well array with reasonable spacing for flooding in rhomboid well pattern, is the key to achieving effective development of reserves and well emplacement for equilibrium displacement development in regular low-permeability anisotropic reservoirs.Based on the characteristics of low-permeability reservoirs, we establish a seepage equation considering the influence of threshold pressure gradient and permeability anisotropy.Classical seepage mechanics is applied to obtain an analytical solution for the seepage field distribution in flooding unit of the rhomboid inverted nine-point well pattern.In turn, a method for evaluating the producing reserve is proposed in line with the analysis of the lateral seepage velocity variation in the flooding unit, and the main factors influencing and rules of producing reserve variation in low-permeability anisotropic reservoirs at different conditions are obtained.At last, a calculation model for optimizing the rhomboid inverted nine-point well pattern is built with the ultimate optimization purpose of meeting "requirement on effective producing reserve range and maximum equilibrium displacement coefficient", and a simultaneous optimization for the best well array with reasonable spacing in this pattern is achieved.Case analysis shows that the rhomboid well pattern optimization design method for low-permeability anisotropic reservoirs can be applied to obtain the best well array with reasonable spacing in line with the actual conditions of the reservoir and the development requirements.The design in all, is of scientific basis to the effective development of reservoirs and optimal emplacement of well patterns.

Key words: effective reserve producing, equilibrium displacement, optimization design, anisotropy, rhomboid injection-production well pattern, low permeability reservoir, reservoir development

CLC Number:

TE348

Minfeng Chen, Ziyou Yang, Lifeng Qin, Shixiong Fu, Jinxi Rong. Producing reserve estimation and design optimization of rhomboid well pattern in anisotropic reservoirs of low permeability[J]. Oil & Gas Geology, 2021, 42(5): 1223-1233.

Figures/Tables 11

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参数	符号	取值范围	一般基准值
有效厚度/m	H	5~40	15.0
主方向渗透率/(10^-3 μm²)	K_x	5~50	10.0
平面渗透率级差	J_K	1~20	10.0
原油粘度/(mPa·s)	μ	1~20	5.0
井距/ m	d_S	100~500	300.0
井排比	ε	1~6	2.0
注采压差/ MPa	p	5~30	15.0

参数名称	流度	平面渗透率级差	注采压差	井距	井排比
符号	λ	J_K	p	d_S	ε
单位	10^-3 μm²/(mPa·s)	无量纲	MPa	m	无量纲
取值范围	0.1~5.0	1~20	5~30	100~500	1~6
与“均衡驱替系数”的变化关系	非线性，拐点位置相关程度小	非线性，拐点位置相关程度大	非线性，拐点位置相关程度小	非线性，拐点位置相关程度小	非线性，拐点位置相关程度大
与“无因次有效动用范围”的变化关系	非线性变化，正相关	非线性变化，负相关	非线性变化，正相关	非线性变化，负相关	非线性变化，正相关

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Producing reserve estimation and design optimization of rhomboid well pattern in anisotropic reservoirs of low permeability

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