依据物质凝聚态分类油气井用转向压裂暂堵剂

Classification of the temporary plugging agent for diverting fracturing in oil and gas wells according to the condensed state of matter

王相春 郑力会 白建文 李品伟 翟晓鹏 魏攀峰

WANG Xiangchun ZHENG Lihui BAI Jianwen LI Pinwei ZHAI Xiaopeng WEI Panfeng

中国石油大学(北京)石油工程学院 中国石油长庆油田分公司油气工艺研究院 低渗透油气田勘探开发国家工程实验室 中国石油长庆油田分公司苏里格气田开发分公司 油气钻采工程湖北省重点实验室(长江大学) 北京力会澜博能源技术有限公司

College of Petroleum Engineering, China University of Petroleum(Beijing), Beijing 102249, China Oil & Gas Technology Research Institute, PetroChina Changqing Oilfield Company, Xi’an 710018, Shaanxi, China National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi’an 710018, Shaanxi, China Sulige Gas Field Development Branch, PetroChina Changqing Oilfield Company, Xi’an 710018, Shaanxi, China Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering(Yangtze University), Wuhan 430100, Hubei, China Beijing Lihui Lab Energy Technology Co., Ltd., Beijing 102299, China

暂堵剂阻止压裂液进入不希望进入的通道而成为油气井转向压裂的关键手段之一。目前零星报道的分类，不利于现场准确选择暂堵剂提高转向压裂成功率。200多篇文献调研的暂堵剂中，有的暂堵剂改变裂缝内压力分布，有的暂堵剂改变岩石力学参数，2种机制均能降低裂缝尖端的能量释放率，进而提高裂缝承压能力实现转向。这些暂堵机制皆因物质凝聚态不同所致。遂按凝聚态将暂堵剂分为固态、液-固态、液态等3大类23种，涵盖所有的暂堵剂，提高涵盖率17%，实现了全面覆盖；暂堵剂的密度、粒径、适用温度、解封时间、封堵压力和渗透率恢复值，关联压裂液的密度和排量、封堵孔径或缝宽、储层温度、焖井返排时间、储层应力状态及物性，提高了现场选择暂堵剂的针对性。依据物质凝聚态分类油气井用转向压裂暂堵剂，解决了目前分类方法无法涵盖全部产品、不利于现场准确选择的难题。

Temporary plugging agent, effectively preventing the deviation flow of fracturing fluid, is crucial to diverting fracturing in oil and gas wells. Proper classification is conducive to accurately select the temporary plugging agents on site and improve the success ratio of diverting fracturing. Among the temporary plugging agents researched in over 200 literature, some change the pressure patterns in the fracture,some change the rock mechanics parameters, which reduce the energy release rate at the tip of the fracture, and thus improve the pressure bearing capacity of the fracture to realize the diverting fracturing. All temporary plugging mechanisms result from different condensed state of the matter. Therefore, in terms of the condensed state, the temporary plugging agents are classified into three categories: solid, liquid-solid and liquid, including 23 sorts, which covers all temporary plugging agents. And the coverage percentage is increased by 17%. The densities, particle sizes, applicable temperature, unplugging duration, plugging pressure and return permeability of the temporary plugging agent are related to the density and displacement of fracturing fluid, plugging hole diameter or fracture width, reservoir temperature, shut-in and flow-back time, reservoir stress state as well as the physical properties, which improves the accuracy of selection of temporary plugging agent on site.Therefore, classification of the temporary plugging agent for diverting fracturing in oil and gas wells according to the condensed state of matter has addressed the challenges such as lower coverage percentage of the current classification method and inaccurate selection of temporary plugging agents on site.

10.13639/j.odpt.202308012