Variations of Produced Polymer Concentration for Polymer Flooding in Conglomerate Reservoirs

doi:10.7657/XJPG20200311

Abstract

Abstract:

Over a long-term waterflooding development, the conglomerate reservoir of the lower Karamay formation in QD1 block of Karamay oilfield in Xinjiang is featured with strong heterogeneity, developed fracture and developed preferential migration pathway. But high concentration of produced polymer in producers during subsequent polymer flooding affects the polymer flooding effect. In order to understand the variations of produced polymer concentration of polymer flooding in conglomerate reservoirs, taking the reservoir characteristics and fluids in QD1 block as research objects, the paper carries out studies related to production stage classification for the polymer flooding, rising law of the produced polymer concentration, charts of the produced polymer concentration limits and the lower injection pressure limits for polymer channeling control. The results show that the production stage of polymer flooding in conglomerate reservoirs can be classified into early stage of polymer injection, peak response stage, late response stage and subsequent water flooding stage. The peak response stage generally lasts for 2 or 3 years with the maximum produced polymer concentration of 737.2 mg/L, the maximum relative produced polymer concentration of 0.550 and the concentration rising rate of 2.3; when the well spacings are 140 m and 120 m, the reasonable rise rate of the relative concentration is 2.3~6.0, the corresponding relative concentration ranges from 0.276 to 0.720 and the produced polymer concentration is 414.0~1 080.0 mg/L. The lower limits of injection pressure for polymer channeling control in wells dominated by preferential migration pathway, hydraulic fracture and fracture plus pathway are 8 MPa,10.0 MPa and 9.5 MPa, respectively. The research results can provide references for production performance adjustment and well treatment during polymer flooding in conglomerate reservoirs in this area.

Key words: Karamay oilfield, conglomerate reservoir, polymer flooding, produced polymer concentration, heterogeneity, boundary chart, polymer channeling well

CLC Number:

TE341

ZHANG Defu, LYU Jianrong, TIAN Mi, ZHANG Jing. Variations of Produced Polymer Concentration for Polymer Flooding in Conglomerate Reservoirs[J]. Xinjiang Petroleum Geology, 2020, 41(3): 326-331.

Figures/Tables 7

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References 17

[1]	钱根葆, 许长福, 陈玉琨 , 等. 砂砾岩储集层聚合物驱油微观机理:以克拉玛依油田七东1区克拉玛依组下亚组为例[J]. 新疆石油地质, 2016,37(1):57-61.
	QIAN Genbao, XU Changfu, CHEN Yukun , et al. Microscopic mechanism of polymer flooding in glutenite reservoir of Lower Karamay formation in East District-7(1),Karamay oilfield[J]. Xinjiang Petroleum Geology, 2016,37(1):57-61.
[2]	吕建荣, 谭锋奇, 许长福 , 等. 克拉玛依砾岩油藏储层分类特征及水驱油规律[J]. 东北石油大学学报, 2015,39(4):21-30.
	LV Jianrong, TAN Fengqi, XU Changfu , et al. Classification characteristics and regularity of water flooding in conglomerate reservoir of Karamay[J]. Journal of Northeast Petroleum University, 2015,39(4):21-30.
[3]	张代燕, 彭永灿, 肖芳伟 , 等. 克拉玛依油田七中、东区克下组砾岩储层孔隙结构特征及影响因素[J]. 油气地质与采收率, 2013,20(6):29-34.
	ZHANG Daiyan, PENG Yongcan, XIAO Fangwei , et al. Pore structure and influence factors of conglomerate reservoir:case study of lower Karamay formation in mid and east of 7th block,Karamay oilfield[J]. Petroleum Geology and Recovery Efficiency, 2013,20(6):29-34.
[4]	邹玮, 陈玉琨, 楼仁贵 , 等. 新疆油田七东₁区砾岩油藏聚合物驱见聚特征与影响因素研究[J]. 石油知识, 2015,27(1):50-52.
	ZOU Wei, CHEN Yukun, LOU Rengui , et al. Study on polymer flooding characteristics and influencing factors of conglomerate reservoirs in Qidong_1 area of Xinjiang oilfield[J]. Petroleum Knowledge, 2015,27(1):50-52.
[5]	王宏宇 . 聚合物驱采聚浓度变化特征分析[J]. 内蒙古石油化工, 2010,36(18):127-129.
	WANG Hongyu . Analysis of the variation characteristics of polymer flooding concentration[J][J]. Inner Mongolia Petrochemical Industry, 2010,36(18):127-129.
[6]	刘文业 . 聚合物驱油井产出液中聚合物浓度的准确测定方法[J]. 油气地质与采收率, 2006,13(2):91-99.
	LIU Wenye . A method for accurate determination of polymer concentration in produced fluid of oil well by polymer flooding[J]. Petroleum Geology and Recovery Efficiency, 2006,13(2):91-99.
[7]	左灵, 戴彩丽, 马世英 , 等. 聚合物驱产出液中疏水缔合聚合物质量浓度测定[J]. 油田化学, 2010,27(2):171-173.
	ZUO Ling, DAI Caili, MA Shiying , et al. Determination of hydrophobic associating polymer concentration in produced fluids from polymer flooding reservoir[J]. Oilfield Chemistry, 2010,27(2):171-173.
[8]	周丛丛 . 大庆油田一、二类油层聚合物驱注采指标变化规律[J]. 断块油气田, 2015,22(5):610-613.
	ZHOU Congcong . Variation laws of injection and production indexes of polymer flooding in primary and sub-layers in Daqing oilfield[J]. Fault-Block Oil & Gas Field, 2015,22(5):610-613.
[9]	陈文娟, 张健, 胡科 , 等. 适于海上油田的聚合物产出浓度快速测定方法[J]. 油田化学, 2016,33(1):176-180.
	CHEN Wenjuan, ZHANG Jian, HU Ke , et al. Rapid determination of polymer concentration for the polymer-flooding produced fluid in offshore oilfield[J]. Oilfield Chemistry, 2016,33(1):176-180.
[10]	高春平 . 扶余油田西5-16区块聚合物驱封窜技术研究[D]. 黑龙江大庆:东北石油大学, 2015.
	GAO Chunping . The research on polymer flooding plugging channeling technology in the western 5-16 block of Fuyu oilfield[D]. Daqing,Heilongjiang:Northeast Petroleum University, 2015.
[11]	陶德硕 . 水驱和聚合物驱油藏井间动态连通性定量识别研究[D]. 山东青岛:中国石油大学(华东), 2011.
	TAO Deshuo . Study on inferring interwell connectivity quantitatively from well signals in waterfloods and polymerfloods[D].Qingdao,Shandong:China University of Petroleum(East China), 2011.
[12]	吴金涛 . 二元复合驱化学剂窜流预警方法研究[D].山东青岛:中国石油大学( 华东), 2014.
	WU Jintao . Research of the early warning method of chemical crossflow during the polymer-surfactant flooding[D]. Qingdao,Shandong:China University of Petroleum( East China), 2014.
[13]	孙灵辉 . 化学剂在多孔介质传输机理研究[D]. 北京:中国科学院研究生院, 2007.
	SUN Linghui . Study on chemical agents transmission mechanism[D]. Beijing:Graduate University of Chinese Academy of Sciences, 2007.
[14]	王家禄, 袁士义, 石法顺 , 等. 三元复合驱化学剂浓度变化的实验研究[J]. 中国科学:技术科学, 2009,39(6):1 159-1 166.
	WANG Jialu, YUAN Shiyi, SHI Fashun , et al. Experimental study on the concentration change of three element compound flooding[J]. Science in China:Technological Sciences, 2009,39(6):1 159-1 166.
[15]	徐后伟, 王海明, 刘荣军 , 等. 砾岩油藏聚合物驱储集层多参数精细评价及应用——以克拉玛依油田七东1区克拉玛依组下亚组砾岩油藏为例[J]. 新疆石油地质, 2018,39(2):169-175.
	XU Houwei, WANG Haiming, LIU Rongjun , et al. Fine multiparameter evaluation for polymer flooding in conglomerate reservoirs and its application: a case study from lower Karamay formation in District Qidong-1, Karamay oilfield[J]. Xinjiang Petroleum Geology, 2018,39(2):169-175.
[16]	未志杰, 康晓东, 何春百 , 等. 海上多层稠油聚合物驱产液指数变化主控因素[J]. 新疆石油地质, 2018,39(5):578-584.
	WEI Zhijie, KANG Xiaodong, HE Chunbai , et al. Main controlling factors on liquid productivity index for polymer flooding in offshore multi-layered heavy oil reservoirs[J]. Xinjiang Petroleum Geology, 2018,39(5):578-584.
[17]	孙灵辉, 黄延章, 刘卫东 , 等. ASP复合体系在多孔介质中的传输特性[J]. 石油钻采工艺, 2011,33(1):80-82.
	SUN Linghui, HUANG Yanzhang, LIU Weidong , et al. ASP system transmission characteristics in the porous media[J]. Oil Drilling & Production Technology, 2011,33(1):80-82.