低渗透储层油水相对渗透率最优目标函数处理方法

doi:10.3969/j.issn.1006-6535.2022.01.013

特种油气藏 ›› 2022, Vol. 29 ›› Issue (1): 85-90.DOI: 10.3969/j.issn.1006-6535.2022.01.013

低渗透储层油水相对渗透率最优目标函数处理方法

崔建¹, 沈贵红¹, 商琳^1,2,3, 孙彦春¹, 龚丽荣¹, 安熠¹

1.中国石油冀东油田分公司,河北唐山 063000;
2.中国石油冀东油田分公司博士后科研工作站,河北唐山 063000;
3.中国石油勘探开发研究院博士后流动站,北京 100083

收稿日期:2020-10-27 修回日期:2021-10-13 出版日期:2022-02-25 发布日期:2023-01-10
通讯作者: 商琳(1987—),男,高级工程师,在站博士后,2008年毕业于中国石油大学(华东)资源勘查工程专业,2014年毕业于该校地质学专业,获博士学位,现从事油藏描述及低渗、致密油藏开发、储气库地质评价等工作。
作者简介:崔建(1981—),男,高级工程师,2005年毕业于长江大学资源勘查工程专业,2008年毕业于该校矿产普查与勘探专业,获硕士学位,现从事油藏开发与地质研究工作。
基金资助:
国家自然科学基金“超深层碎屑岩油气藏渗流物理基础研究”(51774300)

Optimal Objective Function Processing Method for Oil-Water Relative Permeability of Low-Permeability Reservoirs

Cui Jian¹, Shen Guihong¹, Shang Lin^1,2,3, Sun Yanchun¹, Gong Lirong¹, An Yi¹

1. PetroChina Jidong Oilfield Company, Tangshan, Hebei 063000,China;
2. Postdoctoral Research Center, PetroChina Jidong Oilfield Company, Tangshan, Hebei 063000, China;
3. Postdoctoral Research Center, Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received:2020-10-27 Revised:2021-10-13 Online:2022-02-25 Published:2023-01-10

摘要/Abstract

摘要： 对于非均质和亲水性强的低渗透岩心,使用常规JBN方法整理非稳态实验数据得到的相对渗透率曲线,存在因计算失效导致的水相相对渗透率曲线出现“驼峰”等异常现象。除了岩样的非均质性、出口端提前见水、驱替速度不合适以及难以测定油水黏度比等实验因素,利用JBN等常规方法处理非稳态水驱油实验资料的局限性是产生相对渗透率曲线异常形态的主要原因。针对上述问题,建立了考虑毛管力效应的低渗透储层油水渗流模型,采用自动历史拟合方法对油水相对渗透率实验数据进行处理,并且对比研究了不同方法对低渗透岩心油水相对渗透率的影响。结果表明:基于最优目标函数的低渗透油藏油水相对渗透率自动历史拟合方法相较于JBN和Jones方法,在计算结果上具有曲线光滑、规律明显的优势,最大程度减少了低渗透油藏相对渗透率的计算误差;考虑毛管力时,3种方法得到的结果都是油相相对渗透率增加,水相相对渗透率基本不变,而自动历史拟合方法能更加合理均匀地体现出油相相对渗透率的变化趋势。自动历史拟合方法克服了JBN等常规方法的局限性,适用性更好,可为后续的数值模拟等研究提供重要参数。

关键词: 低渗透油藏, 油水相对渗透率, 毛管力效应, 自动历史拟合

Abstract: For heterogeneous and hydrophilic cores with permeability,the relative permeability curve was obtained from the non-stationary experimental data by the conventional JBN method, and there were some anomalies such as "humps" in the water relative permeability curve caused by calculation failure. In addition to experimental factors such as heterogeneity of rock samples,early water breakthrough at the outlet, inappropriate displacement velocity,and difficulties in determining the oil-water viscosity ratio, the limitation of conventional methods such as JBN in processing the experimental data of unsteady water-oil displacement is the root cause for the abnormal shape of the relative permeability curve.To solve the above problems,an oil-water seepage model of low-permeability reservoir was established considering the effect of capillary force.The experimental data of oil-water relative permeability were processed by automatic historical fitting method, and the effects of different methods on the oil-water relative permeability of low-permeability core were compared and analyzed.The results showed that, compared with the JBN and Jones methods, the automatic history fitting method for oil-water relative permeability in low-permeability reservoir based on the optimal objective function was advantaged by smooth curve and obvious rules,and reduced the errors in the calculation of relative permeability in low-permeability reservoir to the greatest extent; when capillary force was considered,the results obtained by the three methods were that the oil relative permeability was increased,the water relative permeability was basically unchanged, and the automatic history fitting method reflected the trend of oil relative permeability in a more reasonable and uniform way.The automatic history fitting method overcame the limitations of conventional methods such as JBN,with better applicability,providing important parameters for subsequent numerical simulation and other studies.

Key words: low-permeability reservoir, oil-water relative permeability, capillary force effect, automatic history matching

中图分类号:

TE348

崔建, 沈贵红, 商琳, 孙彦春, 龚丽荣, 安熠. 低渗透储层油水相对渗透率最优目标函数处理方法[J]. 特种油气藏, 2022, 29(1): 85-90.

Cui Jian, Shen Guihong, Shang Lin, Sun Yanchun, Gong Lirong, An Yi. Optimal Objective Function Processing Method for Oil-Water Relative Permeability of Low-Permeability Reservoirs[J]. Special Oil & Gas Reservoirs, 2022, 29(1): 85-90.

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低渗透储层油水相对渗透率最优目标函数处理方法

Optimal Objective Function Processing Method for Oil-Water Relative Permeability of Low-Permeability Reservoirs

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