含水致密砂岩气藏可动用储量评价新方法及其应用

doi:10.7623/syxb202103006

石油学报 ›› 2021, Vol. 42 ›› Issue (3): 332-340.DOI: 10.7623/syxb202103006

含水致密砂岩气藏可动用储量评价新方法及其应用

胡勇¹, 李熙喆¹, 徐轩¹, 梅青燕², 陈颖莉², 王继平³, 焦春艳¹, 郭长敏¹, 贾玉泽⁴

1. 中国石油勘探开发研究院北京 100083;
2. 中国石油西南油气田公司四川成都 610051;
3. 中国石油长庆油田公司陕西西安 710018;
4. 中国科学院渗流流体力学研究所河北廊坊 065007

收稿日期:2020-03-27 修回日期:2020-07-07 出版日期:2021-03-25 发布日期:2021-04-09
通讯作者: 胡勇,男,1978年5月生,2005年获大庆石油学院学士学位,2016年获东北石油大学博士学位,现为中国石油勘探开发研究院高级工程师,主要从事天然气开发实验与基础理论应用研究。
作者简介:胡勇,男,1978年5月生,2005年获大庆石油学院学士学位,2016年获东北石油大学博士学位,现为中国石油勘探开发研究院高级工程师,主要从事天然气开发实验与基础理论应用研究。Email:huy69@petrochina.com.cn
基金资助:
国家自然科学基金项目（No.51704326）资助。

A new evaluation method for recoverable reserves of water-bearing tight sandstone gas reservoir and its application

Hu Yong¹, Li Xizhe¹, Xu Xuan¹, Mei Qingyan², Chen Yingli², Wang Jiping³, Jiao Chunyan¹, Guo Changmin¹, Jia Yuze⁴

1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
2. PetroChina Southwest Oil & Gasfield Company, Sichuan Chengdu 610051, China;
3. PetroChina Changqing Oilfield Company, Shaanxi Xi'an 710018, China;
4. Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Hebei Langfang 065007, China

Received:2020-03-27 Revised:2020-07-07 Online:2021-03-25 Published:2021-04-09

摘要/Abstract

摘要： 确定可动用储量是气藏开发评价的核心工作，也是开发方案科学编制的重要基础。致密砂岩储层一般具有基质致密、高含水饱和度等特征，其基质储量动用十分缓慢，气藏开发早期难以准确评价。根据气藏衰竭开采过程中压降漏斗特征，采用长岩心多点测压物理模拟实验方法及流程，模拟测试了常规空气渗透率分别为1.630 mD、0.580 mD、0.175 mD、0.063 mD的含水储层孔隙压力在衰竭开采过程中的变化特征，建立了一套面积占比方法，实现了对可动用储量进行量化评价，提出了一套提高气藏储量动用技术的对策与建议。以井控范围400 m为例，分别评价了瞬时产气量降为10%时的初期配产和极限动用条件两种情况下的储量动用情况。研究结果表明：含水致密砂岩气藏的采出程度与储层渗透率、含水饱和度、废弃产量等因素密切相关，总体上基质越致密、含水饱和度越高、废弃产量越大，则采出程度越低；通过优化加密井网、人工裂缝规模与基质的匹配关系，避开可动水层、实施控水增气开采，降低废弃产量、延长气井生命周期等技术措施可以提高采出程度。

关键词: 致密砂岩气藏, 含水, 基质, 可动用储量, 评价方法, 物理模拟

Abstract: The determination of recoverable reserves is the core work of gas reservoir development evaluation, and provides an important basis for scientifically making development program. The tight sandstone gas reservoirs generally have the characteristics of compact matrix and high water saturation. In the eary developent stage of gas reserviors, it is a great challenge to accurately evaluate the reserve in matrix due to the very slow recovery process. According to the characteristics of pressure drop funnel during gas reservoir depletion production, the physical simulation experiment method of long-core multi-point pressure measurement is used to determine the variation charateristics of pore pressure in water-bearing reservoirs with the conventional air permeability of 1.63, 0.58, 0.175 and 0.063 mD, respectively. On this basis, this paper establishes a set of area-proportion methods, realizes the quantitative evaluation of recoverable reserves, and proposes measures and suggestions for improving gas reservior utilization technologies. In case of the well control range of 400 m, the evalution is perfromed on reserve utilizaiton in the condition of the maximum degree of reserve recovery and the initial production allocation with the instantaneous gas production decreased to 10%, respectively. The results show that the recovery degree of water-bearing tight sandstone gas reservoirs is closely realted with reservoir permeability, water saturation and abandonment production. As a whole, the more compact the matrix, the higher the water saturation and the abandonment production, the lower the recovery degree of reservoirs; it can be increased by optimizing the matching relationship between well pattern infilling, proportion of artificial fractures and the matrix, water-control mining to increase gas production while avoiding movable water layers, reducing abandonment production, and prolonging the life cycle of gas wells.

Key words: tight sandstone gas reservoir, water-bearing, matrix, recoverable reserves, evaluation method, physical simulation

中图分类号:

TE155

胡勇, 李熙喆, 徐轩, 梅青燕, 陈颖莉, 王继平, 焦春艳, 郭长敏, 贾玉泽. 含水致密砂岩气藏可动用储量评价新方法及其应用[J]. 石油学报, 2021, 42(3): 332-340.

Hu Yong, Li Xizhe, Xu Xuan, Mei Qingyan, Chen Yingli, Wang Jiping, Jiao Chunyan, Guo Changmin, Jia Yuze. A new evaluation method for recoverable reserves of water-bearing tight sandstone gas reservoir and its application[J]. Acta Petrolei Sinica, 2021, 42(3): 332-340.

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含水致密砂岩气藏可动用储量评价新方法及其应用

A new evaluation method for recoverable reserves of water-bearing tight sandstone gas reservoir and its application

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