Beneficial exploration based on geology-engineering integration in low-saturation oil reservoirs of Tuha Oilfield

doi:10.3969/j.issn.1672-7703.2017.01.006

Abstract

Abstract: In recent years, significant breakthroughs have been realized in the exploration of the Middle-Lower Jurassic Xigou Group lowsaturation oil reservoirs in the Taibei depression, the Tuha Basin. In the Hongtai area, large-scale monoblock reserves were discovered and the productivity construction has been started promptly. Breakthrough and progress of regional expansion has been made in multiple fields. Thus, a new field of reserve enhancement and productivity construction with promising exploration prospect is uncovered and the beneficial exploration of complex oil and gas reservoirs is realized. This important discovery benefits from the transformation of exploration ideas and the technical advancement. With reference to the principle of tight oil exploration, the Tuha Oilfield is developed by certain procedures. First, promote the stimulation technology of horizontal well+volume fracturing, apply the geology-engineering integration technology to explore the low-permeability and low-saturation oil reservoirs in the Taibei depression, and deepen the investigation of hydrocarbon accumulation mechanisms to predict sweet spots of reservoirs accurately. Second, design the trajectory and orientation of horizontal wells scientifically and strengthen the engineering geosteering and trajectory tracking of horizontal sections to increase the reservoir drilling ratio of horizontal wells effectively. Third, optimize the scale and technological parameters of volume fracturing according to the characteristics of oil reservoirs, and apply the geology-engineering integration during the whole process to promote the significant exploration breakthrough. Fourth, strengthen the integration of mature technologies and enhance ROP continuously. Fifth, optimize casing program, well completion mode, pipe string design and cementing technologies. And sixth, take various measures to strengthen the cost reduction and efficiency improvement. For the low-grade reserves, it is necessary to uphold firmly the concept of beneficial exploration. For purpose of geology-engineering integration, it is essential to identify the main control factors accurately. In general, the geology-engineering integration is critical for guaranteeing the beneficial production of low-grade reserves.

Key words: Tuha Basin, Hongtai area, low-saturation oil reservoir, horizontal well, volume fracturing, geology-engineering integration, beneficial exploration

CLC Number:

TE313

Wang Xin, Yang Bin, Wang Rui. Beneficial exploration based on geology-engineering integration in low-saturation oil reservoirs of Tuha Oilfield[J]. China Petroleum Exploration, 2017, 22(1): 38-45.

References

[1] 殷一丹，谢锐杰，刘武波. 地震地质综合解释技术在红台地区储层预测中的应用[J]. 长江大学学报：自然科学版，2015,12(17):31-34. Yin Yidan, Xie Ruijie, Liu Wubo. Application of comprehensive seismic and geological interpreting technique in reservoir prediction in Hongtai area[J]. Journal of Yangtze University:Natural Science Edition，2015,12(17):31-34.
[2] 戴胜群，徐勋诚，洪秀娥，等. 低饱和度油藏原始饱和度计算及含水上升规律[J]. 海洋石油，2011,31(4):68-72. Dai Shengqun， Xu Xuncheng，Hong Xiu’e, et al. The initial oil saturation calculation and water cut rising rules of low oil saturation reservoir[J]. Offshore Oil,2011,31(4):68-72.
[3] 岳江河，肖乔刚. 美国PR盆地浅部Parkman储层致密砂岩水平井钻井关键技术措施及其实施效果[J]. 中国海上油气，2016,28（2):99-102. Yue Jianghe, Xiao Qiaogang. Key technical measures and operation effect of horizontal drilling for Parkman tight sand formations in PR Basin in USA[J]．China Offshore Oil and Gas,2016,28(2):99-102.
[4] 刘旭礼. 页岩气水平井钻井的随钻地质导向方法[J]. 天然气工业，2016,36(5):69-73. Liu Xuli. Geosteering technology in the drilling of shale gas horizontal wells[J]. Natural Gas Industry,2016,36(5):69-73.
[5] 陈颖杰，刘阳，徐婧源，等. 页岩气地质工程一体化导向钻井技术[J]. 石油钻探技术，2015,43(5):56-62. Chen Yingjie，Liu Yang，Xu Jingyuan, et al. Integrated steering drilling technology for geology engineering of shale gas[J]. Petroleum Drilling Techniques，2015,43(5):56-62.
[6] 刘伟，陶谦，丁士东. 页岩气水平井固井技术难点分析与对策[J]. 石油钻采工艺，2012,34(3):40-43. Liu Wei, Tao Qian, Ding Shidong. Difficulties and countermeasures for cementing technology of salle gas horizontal well[J]. Oil Drilling & Production Technology，2012,34(3):40-43.
[7] 范子菲，方宏长，俞国凡. 水平井水平段最优长度设计方法研究[J]. 石油学报，1997,18(1):55-62. Fan Zifei, Fang Hongchang, Yu Guofan. A study on design method of optimal horizontal wellbore length[J]. Acta Petrolei Sinica, 1997,18(1):55-62.
[8] 付金华,喻建,徐黎明,等. 鄂尔多斯盆地致密油勘探开发新进展及规模富集可开发主控因素[J]. 中国石油勘探, 2015,20(5): 9-19. Fu Jinhua, Yu Jian, Xu Liming, et al . New Progress in exploration and development of tight oil in Ordos Basin and main controlling factors of largescale enrichment and exploitable capacity[J].China Petroleum Exploration, 2015, 20(5):9-19.
[9] 王理斌，段宪余，钟伟，等. 地质建模在苏丹大位移水平井地质导向中的应用[J]. 岩性油气藏，2012,24(4):90-92. Wang Libin， Duan Xianyu， Zhong Wei, et al. Application of geological modeling to geosteering in Sudan extended-reach horizontal wells[J]. Lithologic Reservoirs，2012，24(4):90-92.
[10] 杨国平，张吉，强小龙，等. 水平井地质导向技术在致密砂岩气藏中的应用及技术难点——以苏里格气田为例[J]. 天然气勘探与开发，2014,35(3):58-62. Yang Guoping, Zhang Ji, Qiang Xiaolong， et al. Application of horizontal-well geosteering to tight sandstone gas reservoirs: an example from Sulige gas field[J]. Natural Gas Exploration and Development, 2014,35(3):58-62.
[11] 盖姗姗. “水上漂”油层水平井地质导向录井技术——以胜利油田Ｇ43-p17井为例[J]. 录井工程，2016,27(1):33-35. Gai Shanshan. Geo-steering logging technology for horizontal wells in“floating on water”reservoir taking well G43-p17 in Shengli oilfield as an example[J]. Mud Logging Engineering，2016,27(1):33-35.
[12] 吴奇，梁兴，鲜成钢，等.地质—工程一体化高效开发中国南方海相页岩气[J].中国石油勘探，2015,20(4):1-23. Wu Qi, Liang Xing, Xian Chenggang, et al.Geoscience-to-production integration ensures effective and efficient south China marine shale gas development[J].China Petroleum Exploration, 2015,20(4):1-23.
[13] 曹国玺.厚层状高压低渗透低饱和油藏压裂效果的预测[J]. 西南石油学院学报，1995,17(4):43-50. Cao Guoxi. Fracturing prediction of high-pressure，tight，low-saturated and thick-layered pool[J]. Journal of Southwestern Petroleum Institute，1995,17(4):43-50.
[14] 马旭，郝瑞芬，来轩昂，等. 苏里格气田致密砂岩气藏水平井体积压裂矿场试验[J]. 石油勘探与开发，2014,41(6):742-747. Ma xu, Hao Ruifen, Lai Xuan’ang, et al. Field test of volume fracturing for horizontal wells in Sulige tight sandstone gas reservoirs [J]. Petroleum Exploration and Development，2014,41(6):742-747.
[15] 赵振峰，王文雄，邹雨时，等. 致密砂岩油藏体积压裂裂缝扩展数值模拟研究[J]. 新疆石油地质，2014,35(4):447-450. Zhao Zhenfeng, Wang Wenxiong, Zou Yushi，et al. Numerical simulation research of fracture propagation in tight sand reservoir by volume fracturing process[J]. Xinjiang Petroleum Geology，2014,35(4):447-450.
[16] 刘金玉,王殿生,刘柏林，等. 低渗低饱和砂岩水驱油过程中含水率变化规律研究[J]. 西安石油大学学报：自然科学版，2011，26(1):37-41. Liu Jinyu, Wang Diansheng, Liu Bolin, et al. Study on the variation law of the water-cut of low-permeability low-saturation sandstone reservoirs in water displacing oil[J]. Journal of Xi’an Shiyou University:Natural Science Edition，2011,26(1):37-41.
[17] 陈民锋，陈璐，张琪琛，等. 低渗透油藏改造后水平井压力分布规律[J]. 深圳大学学报理工版，2016,33(4):37-41. Chen Minfeng，Chen Lu，Zhang Qichen，et al. Field pressure distribution of horizontal wells in low permeable stimulated reservoirs[J]. Journal of Shenzhen University Science and Engineering，2016,33(4):37-41.
[18] 刘雄，王磊，王方，等. 致密油藏水平井体积压裂产能影响因素分析[J]. 特种油气藏，2016,23(2):85-88. Liu Xiong， Wang Lei， Wang Fang, et al. Sensitivity analysis of volume-fractured horizontal well productivity in tight reservoir[J]. Special Oil and Gas Reservoirs，2016，23（2）：85-88.
[19] 宁正福，韩树刚，程林松，等. 低渗透油气藏压裂水平井产能计算方法[J]. 石油学报，2002,23(2):69-71. Ning Zhengfu, Han Shugang, Cheng Linsong, et al. Productivity calculation method of fractured horizontal wells in low-permability oil or gas field[J]. Acta Petrolei Sinica，2002,23(2):69-71.