昭通示范区太阳气田浅层页岩气立体开发实践与认识

doi:10.3969/j.issn.1672-7703.2023.02.007

摘要/Abstract

摘要： 昭通示范区太阳浅层页岩气田自规模开发以来，一直存在着较大井距、单一靶体的开发方式所带来的低储量动用率和低采收率的问题，同时也给后期井网加密或调整留下严重的工程隐患。为此，在太阳浅层页岩气田部署实施了TYH11井组小井距立体开发试验井组，以地质、钻井、压裂、试采资料为基础，以水力裂缝模拟和生产数值模拟为手段，对该井组开展“部署—钻井—压裂—排采—产能”全过程的评价。研究结果表明：太阳气田上奥陶统五峰组—下志留统龙一1亚段内Ⅰ+Ⅱ类储层均具有高产条件，具备纵向多靶体动用基础；形成了钻井、压裂、返排测试全过程的工程技术序列，可支撑小井距立体开发井组顺利实施；小井距立体开发方式有效提高储量动用率23.0%、提高采收率11.0%；天然裂缝沟通造成井组内部以及与邻井的压窜干扰，对老井产量造成较大负面影响；邻井组已生产老井周边地应力场变化会加剧井间干扰，建议新投井与老井至少保持380～500m井距。该研究成果为昭通示范区太阳气田浅层页岩气立体开发的推广应用、开发方案设计、开发政策制定和规模效益开发奠定了基础。

关键词: 立体开发, 水力裂缝模拟, 数值模拟, 页岩气, 昭通区块

Abstract: Since the large-scale development of Taiyang Shallow Shale Gas Field in Zhaotong demonstration block, there has been always problems such as low reserve production rate and low recovery factor caused by the development mode of large well spacing and single target layer, which also bring severe engineering risks for the later well pattern infill or adjustment. Therefore, pilot well group with small well spacing is deployed and implemented in Platform TYH11 for stereoscopic development of Taiyang Shallow Shale Gas Field. Based on hydraulic fracture simulation and production numerical simulation methods, the whole process evaluation of “pilot well deployment-drillingfracturing-production-production capacity” is conducted by applying geological, drilling, fracturing and production test data. The study results indicate that : (1) ClassⅠ+Ⅱ reservoir in first sub member of the first member of Longmaxi Formation (Long 11 sub member) in the Upper Ordovician Wufeng- Lower Silurian has conditions for high-yield production and basis for multi-target production in vertical; (2) The engineering technology series have been developed for the whole process of drilling, fracturing and well testing, which enable the successful implementation of stereoscopic development well groups with small well spacing; (3) The stereoscopic development mode with small well spacing supports to effectively increase the reserve production rate by 23.0% and the recovery factor by 11.0%; (4) The communication of natural fractures causes pressure channeling interference within the well group and with adjacent wells, which greatly impacts on the production of old wells; (5) The frac-hit is aggravated by the change of in-situ stress field around the adjacent old producing wells, so it is recommended to keep a well spacing of at least 380-500 m between the new well and the old well. The study results lay a foundation for the promotion and application, overall development plan design, development policy formulation, and large-scale and beneficial stereoscopic development of Taiyang Shallow Shale Gas Field in Zhaotong demonstration block.

中图分类号:

TE332

黄小青, 何勇, 崔欢, 季永承, 王鑫, 韩永胜, 王聪聪. 昭通示范区太阳气田浅层页岩气立体开发实践与认识[J]. 中国石油勘探, 2023, 28(2): 70-80.

Huang Xiaoqing, He Yong, Cui Huan, Ji Yongcheng, Wang Xin, Han Yongsheng, Wang Congcong. Practice and understanding of stereoscopic development of Taiyang Shallow Shale Gas Field in Zhaotong demonstration block[J]. China Petroleum Exploration, 2023, 28(2): 70-80.

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