A Method to Calculate Gas Injection Volume in Fault-Karst Carbonate Reservoirs of Tahe Oilfield

doi:10.7657/XJPG20200219

Abstract

Abstract:

Good development effects of nitrogen injection EOR technology have been achieved in the fault-karst reservoirs of Tahe oilfield, but there is no method to determine the reasonable gas injection volume especially for the reservoirs in the oilfield. Based on the production data analysis method and the matching of flow reforming pressure and material balance time curve, the total producing reserves of gas drive well groups in fault-karst reservoirs of Tahe oilfield is obtained. Considering the well pattern characteristics in the fault-karst reservoirs of Tahe oilfield, a method to calculate the plane sweep efficiency of gas drive in the linear well pattern is obtained. Based on the 3D fracture-cave body distribution in the fault-karst reservoirs, a method for calculating the vertical producing degree of gas drive in the fault-karst reservoirs is developed. Based on numerical simulation of the typical fault-karst reservoir, the reasonable gas injection volume is determined to be 0.75 PV of the remaining reserves. Based on the obtained total producing reserves, cumulative oil production before gas injection, plane sweep efficiency, vertical producing degree and reasonable gas injection volume of the gas drive well groups in the fault-karst reservoirs, a method to calculate the reasonable gas injection volume is established for the fault-karst reservoirs of Tahe oilfield. The reasonable gas injection volume obtained from the calculation method has been applied in the gas drive of the fault-karst carbonate reservoirs in Tahe oilfield and the oil production of the response producers can reach 2.5 times the production before gas injection.

Key words: Tahe oilfield, fault-karst reservoir, gas drive well group, reasonable gas injection volume, producing reserves, linear well pattern

CLC Number:

TE357.7

ZHU Guiliang. A Method to Calculate Gas Injection Volume in Fault-Karst Carbonate Reservoirs of Tahe Oilfield[J]. Xinjiang Petroleum Geology, 2020, 41(2): 248-252.

Figures/Tables 5

Fig. 1.

Fig. 2.

Fig. 3.

Fig. 4.

Fig. 5.

References 17

[1]	鲁新便, 胡文革, 汪彦 , 等. 塔河地区碳酸盐岩断溶体油藏特征与开发实践[J]. 石油与天然气地质, 2015,36(3):347-355.
	LU Xinbian, HU Wenge, WANG Yan , et al. Characteristics and development practice of fault-karst carbonate reservoirs in Tahe area,Tarim basin[J]. Oil & Gas Geology, 2015,36(3):347-355.
[2]	李阳 . 塔河油田碳酸盐岩缝洞型油藏开发理论与方法[J]. 石油学报, 2013,34(1):115-121.
	LI Yang . The theory and method for development of carbonate fractured-cavity reservoirs in Tahe oilfield[J]. Acta Petrolei Sinica, 2013,34(1):115-121.
[3]	金强, 田飞 . 塔河油田岩溶型碳酸盐岩缝洞结构研究[J]. 中国石油大学学报(自然科学版), 2013,37(5):15-21.
	JIN Qiang, TIAN Fei . Investigation of fracture-cave constructions of karsted carbonate reservoirs of Ordovician in Tahe oilfield,Tarim basin[J]. Journal of China University of Petroleum(Edition of Natural Science), 2013,37(5):15-21.
[4]	杨敏, 靳佩 . 塔河油田奥陶系缝洞型油藏储层分类评价技术[J]. 石油与天然气地质, 2011,32(4):625-630.
	YANG Min, JIN Pei . Reserve classification and evaluation of the Ordovician fractured-vuggy reservoirs in Tahe oilfield[J]. Oil & Gas Geology, 2011,32(4):625-630.
[5]	鲁新便, 蔡忠贤 . 缝洞型碳酸盐岩油藏古溶洞系统及油气开发:以塔河碳酸盐岩溶洞型油藏为例[J]. 石油与天然气地质, 2010,31(1):22-27.
	LU Xinbian, CAI Zhongxian . A study of the paleo-cavern system in fractured-vuggy carbonate reservoirs and oil/gas development:taking the reservoirs in Tahe oilfield as an example[J]. Oil & Gas Geology, 2010,31(1):22-27.
[6]	惠健, 刘学利, 汪洋 , 等. 塔河油田缝洞型油藏单井注氮气采油机理及实践[J]. 新疆石油地质, 2015,36(1):75-77.
	HUI Jian, LIU Xueli, WANG Yang , et al. Mechanism and practice of nitrogen injection for EOR in fractured-vuggy carbonate reservoir in Tahe oilfield,Tarim basin[J]. Xinjiang Petroleum Geology, 2015,36(1):75-77.
[7]	黄江涛, 周洪涛, 张莹 , 等. 塔河油田单井注氮气采油技术现场应用[J]. 石油钻采工艺, 2015,37(3):103-105.
	HUANG Jiangtao, ZHOU Hongtao, ZHANG Ying , et al. Field application of oil recovery technique by nitrogen injection in single-well in Tahe oilfield[J]. Oil Drilling & Production Technology, 2015,37(3):103-105.
[8]	张希明, 杨坚, 杨秋来 , 等. 塔河缝洞型碳酸盐岩油藏描述及储量评价技术[J]. 石油学报, 2004,25(1):13-18.
	ZHANG Ximing, YANG Jian, YANG Qiulai , et al. Reservoir description and reserves estimation technique for fracture-cave type carbonate reservoir in Tahe oilfield[J]. Acta Petrolei Sinica, 2004,25(1):13-18.
[9]	朱桂良, 孙建芳, 刘中春 . 塔河油田缝洞型油藏气驱动用储量计算方法[J]. 石油与天然气地质, 2019,40(2):436-442.
	ZHU Guiliang, SUN Jianfang, LIU Zhongchun . An approach to calculate developed reserves in gas drive fractured-vuggy reservoirs in Tahe oilfield[J]. Oil & Gas Geology, 2019,40(2):436-442.
[10]	朱桂良, 刘中春, 康志江 . 缝洞型碳酸盐岩油藏大尺度试井新方法[J]. 科学技术与工程, 2014,14(13):172-175.
	ZHU Guiliang, LIU Zhongchun, KANG Zhijiang . The new method of large scale well test in fractured-vuggy carbonate reservoirs[J]. Science Technology and Engineering, 2014,14(13):172-175.
[11]	FETKOVICH M J . Decline curve analysis using type curves[J]. Journal of Petroleum Technology, 1980,32(6):1 065-1 077.
[12]	BLASINGAME T A, LEE W J . Variable-rate reservoir limits testing[R]. SPE 15028, 1986.
[13]	BLASINGAME T A, JOHNSTON J L, LEE W J . Type curve analysis using the pressure integral method[R]. SPE 18799, 1989.
[14]	BLASINGAME T A, MCCRAY T C, LEE W J . Decline curve analysis for variable pressure drop/variable flowrate systems[R]. SPE 21513, 1991.
[15]	吕心瑞, 刘中春, 朱桂良 . 基于PDA方法的缝洞型油藏井控储量评价[J]. 断块油气藏, 2017,24(2):233-237.
	LV Xinrui, LIU Zhongchun, ZHU Guiliang . Well-controlled reserves evaluation of fracture vuggy reservoirs based on PDA method[J]. Fault-Block Oil & Gas Field, 2017,24(2):233-237.
[16]	孙东, 杨丽莎, 陈娟 , 等. 塔里木盆地深层碳酸盐岩缝洞储集层地震响应特征[J]. 新疆石油地质, 2018,39(6):633-642.
	SUN Dong, YANG Lisha, CHEN Juan , et al. Seismic response characteristics of fractured-vuggy reservoirs in deep carbonate horizons of Tarim basin[J]. Xinjiang Petroleum Geology, 2018,39(6):633-642.
[17]	杨子川, 陶磊, 李海英 , 等. 塔河油田S48井区流体多波属性综合预测[J]. 新疆石油地质, 2018,39(6):742-747.
	YANG Zichuan, TAO Lei, LI Haiying , et al. Comprehensive fluid prediction with multi-wave attribute seismic technology in Wellblock S48,Tahe oilfield[J]. Xinjiang Petroleum Geology, 2018,39(6):742-747.