Sensitivity Evaluation of Ultra-low Permeability Sandstone Reservoir and Development of Acidizing Stimulation Fluid

doi:10.3969/j.issn.1006-6535.2022.05.024

Abstract

Abstract: Acidizing is an important stimulation measure for ultra-low permeability sandstone reservoirs. If the acid fluid system is not used properly, it will cause sensitive damage to the reservoir. To this end, taking the sandstone reservoir of Sanjianfang Formation in Shanshan Oilfield, Turpan-Hami Basin as an example, the characteristics of reservoir sensitivity and damage mechanism were studied by means of XRD diffraction analysis, scanning electron microscope, reservoir sensitivity evaluation experiment and field data collation, and an acidizing stimulation fluid was developed, which could be used in combination with mud acid to improve the acidizing effect. The research shows: The rock types of the Sanjianfang Formation reservoirs are mainly feldspar lithic sandstone, and the clay minerals are mainly kaolinite and montmorillonite, which belong to high clay mineral reservoirs. The reservoir physical properties as a whole show the characteristics of low porosity and extra-low permeability, the crude oil is light crude oil, and the reservoir is unsaturated reservoir with normal formation pressure. The reservoir has moderate to weak velocity-sensitive, alkali-sensitive, water-sensitive, salinity-sensitive, and weak acid-sensitive properties. The combined acid fluid system of stimulation fluid and soil acid can dissolve pores of various scales such as macropores and micropores to form a pore network system, which can increase the permeability of the target reservoir core to a maximum of 2.68 times the original permeability. The field application effect is remarkable. Compared with that before acidizing, the average daily oil production of a single well increases by 1.29 t/d. The research results can provide technical support for acidizing stimulation of ultra-low permeability sandstone reservoirs.

Key words: acidizing, ultra-low permeability reservoir, reservoir sensitivity, Shanshan Oilfield, Turpan-Hami Basin

CLC Number:

TE348

Zhang Jinfa, Li Ting, Wu Jingyu, Guan Yingzhu, Xu Mo, Dan Zhihua, Zhou Mingxiu. Sensitivity Evaluation of Ultra-low Permeability Sandstone Reservoir and Development of Acidizing Stimulation Fluid[J]. Special Oil & Gas Reservoirs, 2022, 29(5): 166-174.

References

[1] 李承龙.H1井区特低渗透油藏CO₂驱水平井开发数值模拟研究[D].大庆:东北石油大学,2017.
LI Chenglong.Numerical simulation study of CO₂ flooding horizontal well development in ultra-low permeability reservoir of Well Area H1[D].Daqing:Northeast Petroleum University,2017.
[2] 白芳.鄯善油田不同含水阶段开发对策探析[J].中国石油和化工标准与质量,2018,38(9):92-93.
BAI Fang.Analysis of development strategies in different water-cut stages of Shanshan Oilfield[J].China Petroleum and Chemical Industry Standard and Quality,2018,38(9):92-93.
[3] 王永凯,李炼民.异常高压中高渗油藏储集层应力敏感性研究[J].录井工程,2019,30(1):131-135,142.
WANG Yongkai,LI Lianmin.Study on stress sensitivity of reservoirs with abnormal high pressure and medium-high permeability[J].Mud Logging Engineering,2019,30(1):131-135,142.
[4] 窦宏恩,白喜俊.低渗透和高渗透储层都存在应力敏感性[J].石油钻采工艺,2009,31(2):121-124.
DOU Hongen,BAI Xijun.Stress sensitivity consists in low permeability and middle-high permeability reservoirs[J].Oil Drilling & Production Technology,2009,31(2):121-124.
[5] 吴捷.低渗稠油化学剂辅助二氧化碳吞吐技术研究与应用[J].石油地质与工程,2021,35(3):59-62.
WU Jie.Research and application of chemical agent assisted CO₂ huff and puff technology for heavy oil reservoir with low permeability[J].Petroleum Geology & Engineering,2021,35(3):59-62.
[6] 李江,陈先超,高平,等.考虑应力敏感效应的裂缝性碳酸盐岩气井拟稳态产能预测方法[J].石油钻探技术,2021,49(3):111-116.
LI Jiang,CHEN Xianchao,GAO Ping,et al.A pseudo-steady-state productivity prediction method for fractured carbonate gas wells considering stress-sensitivity effects[J].Petroleum Drilling Techniques,2021,49(3):111-116.
[7] 高志飞,许寻,王坤,等.低渗、特低渗轻质油藏溶解气驱气体流动临界饱和度研究[J].石油地质与工程,2021,35(3):63-66.
GAO Zhifei,XU Xun,WANG Kun,et al.Study on gas critical gas saturation of dissolved gas flooding in light oil reservoir with low permeability and ultra-low permeability[J].Petroleum Geology & Engineering,2021,35(3):63-66.
[8] 李黎,胡文丽,罗启源,等.非达西渗流效应对南海低渗透储层产能的影响[J].大庆石油地质与开发,2021,40(2):160-167.
LI Li,HU Wenli,LUO Qiyuan,et al.Impact of non-Darcy flow on the productivity of low permeability reservoirs in South China Sea[J].Petroleum Geology & Oilfield Development in Daqing,2021,40(2):160-167.
[9] 何辉,李军建,乞照,等.西峰油田N区长₂³储集层特征及敏感性评价[J].新疆石油地质,2020,41(3):278-287.
HE Hui,LI Junjian,QI Zhao,et al.Reservoir Characteristics and Sensitivity Evaluation of Chang₂³ in N Area of Xifeng Oilfield[J].Xinjiang Petroleum Geology,2020,41(3):278-287.
[10] WANG Lei,ZHANG Hui,PENG Xiaodong,et al.Water-sensitive damage mechanism and the injection water source optimization of low permeability sandy conglomerate reservoirs[J].Petroleum Exploration and Development,2019,46(6):1218-1230.
[11] HU Wenrui,WEI Yi,BAO Jingwei.Development of the theory and technology for low permeability reservoirs in China[J].Petroleum Exploration and Development,2018,45(4):685-697.
[12] 于宝石,郑瑞,计玉冰,等.筠连地区煤储层敏感性及配伍性分析[J].煤炭科学技术,2021,49(9):193-199.
YU Baoshi,ZHENG Rui,JI Yubing,et al.Analysis of coal reservoir sensitivity and compatibility in Junlian Area[J].Coal Science and Technology,2021,49(9):193-199.
[13] 周丹,熊旭东,何军榜,等.低渗透储层多级转向压裂技术[J].石油钻探技术,2020,48(1):85-89.
ZHOU Dan,XIONG Xudong,HE Junbang,et al.Multi-stage deflective fracturing technology for low permeability reservoir[J].Petroleum Drilling Techniques,2020,48(1):85-89.
[14] 江涛,韦涛,范旭,等.鄂尔多斯盆地东缘C-P煤系致密砂岩储层敏感性分析[J].高校地质学报,2020,26(3):313-322.
JIANG Tao,WEI Tao,FAN Xu,et al.Sensitivity analysis of tight sandstone reservoirs of Carboniferous-Permian coal-series in the eastern margin of the Ordos Basin[J].Geological Journal of China Universities,2020,26(3):313-322.
[15] 杨竞旭,陈少勇,丛彭,等.高尚堡油田致密砂岩储层敏感性评价[J].石油地质与工程,2021,35(1):66-71.
YANG Jingxu,CHEN Shaoyong,CONG Peng,et al.Sensitivity evaluation of tight sandstone reservoirs in Gaoshangpu Oilfield[J].Petroleum Geology & Engineering,2021,35(1):66-71.
[16] 邵东波,陈建文.鄂尔多斯盆地致密砂岩储层敏感性特征及其控制因素——以新安边地区延长组长₆储层为例[J].西安石油大学学报(自然科学版),2017,32(3):55-60,67.
SHAO Dongbo,CHEN Jianwen.Sensitivity of tight sandstone reservoir in Ordos Basin and its controlling factor:taking the Chang₆ Reservoir of Yanchang Formation in Xin′anbian Area as example[J].Journal of Xi′an Shiyou University(Natural Science),2017,32(3):55-60,67.
[17] 何海峰.胜利海上疏松砂岩油藏分层防砂分层采油技术[J].石油钻探技术,2021,49(6):99-104.
HE Haifeng.Separate layer sand control and oil production technology in offshore unconsolidated sandstone reservoirs of Shengli Oilfield[J].Petroleum Drilling Techniques,2021,49(6):99-104.
[18] 吕佳蕾,吴因业.鄂尔多斯盆地中部地区致密砂岩储层敏感性及损害机理[J].大庆石油地质与开发,2019,38(3):167-174.
LYU Jialei,WU Yinye.Sensitivities and damage mechanisms of the tight sandstone reservoir in Central Ordos Basin[J].Petroleum Geology & Oilfield Development in Daqing,2019,38(3):167-174.
[19] 阳晓燕,刘美佳,张博,等.疏松砂岩稠油油藏岩石应力敏感性对蒸汽驱的影响[J].石油地质与工程,2020,34(5):79-82.
YANG Xiaoyan,LIU Meijia,ZHANG Bo,et al.Effect of rock stress sensitivity on steam flooding in unconsolidated sandstone heavy oil reservoir[J].Petroleum Geology & Engineering,2020,34(5):79-82.
[20] 王晓雯.致密油藏储层敏感性评价及主控因素研究[J].特种油气藏,2021,28(1):103-110.
WANG Xiaowen.Study on reservoir sensitivity evaluation and key control factors of tight oil reservoirs[J].Special Oil & Gas Reservoirs,2021,28(1):103-110.
[21] ZHANG Lufeng,ZHOU Fujian,ZHANG Shicheng,et al.Investigation of water-sensitivity damage for tight low-permeability sandstone reservoirs[J].ACS Omega,2019,4(6):11197-11204.
[22] 黄婷,苏良银,达引朋,等.超低渗透油藏水平井储能压裂机理研究与现场试验[J].石油钻探技术,2020,48(1):80-84.
HUANG Ting,SU Liangyin,DA Yinpeng,et al.Research and field test on energy storage fracturing mechanism of horizontal wells in ultra-low permeability reservoirs[J].Petroleum Drilling Techniques,2020,48(1):80-84.
[23] GU Yang,DING Wenlong,YIN Min,et al.Study on pressure sensitivity of tight sandstone and its influence on reservoir characteristics[J].Energy Sources,Part A:Recovery,Utilization,and Environmental Effects,2018,40(22):2671-2677.