Formation damage prevention using microemulsion in tight sandstone gas reservoir

被引:59
|
作者
Dong, Bingqiang [1 ,2 ,3 ]
Meng, Meng [3 ,4 ]
Qiu, Zhengsong [3 ]
Lu, Zhaohui [1 ,2 ]
Zhang, Ye [1 ,2 ]
Zhong, Hanyi [3 ]
机构
[1] Chongqing Inst Geol & Mineral Resources, Natl Joint Engn Res Ctr Shale Gas Explorat & Dev, Chongqing 400042, Peoples R China
[2] Minist Land & Resources, Key Lab Shale Gas Explorat, Chongqing Inst Geol & Mineral Resources, Chongqing 400042, Peoples R China
[3] China Univ Petr, Coll Petr Engn, Qingdao 266580, Peoples R China
[4] Univ Tulsa, Dept Petr Engn, Tulsa, OK 74104 USA
基金
中国国家自然科学基金;
关键词
Damage mechanism; Water blocking; Sensitivity damages; Protective drilling fluid; STRESS SENSITIVITY; LOW-PERMEABILITY; DRILLING-FLUID; OIL; REMOVAL; MODEL; SAND; FLOW;
D O I
10.1016/j.petrol.2018.10.003
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Formation damage is an inevitable problem during drilling in the sandstone gas reservoir. The invasion of drilling fluid could cause the decreasing of permeability of the formation and induce the reduction of gas production. In this paper, one kind of microemulsion is designed to improve the performance of drilling fluid in Sulige gas field, China. The fundamental chemical/physical properties and damage mechanism of targeted tight sandstone formation is analyzed using a combination of several experimental methods, including X-ray diffraction, scanning electron microscopy, core inhibition test, and etc. It shows that the formation rock is composed of medium to coarse particles and massive sensitive minerals, distributed with tiny connected pore throats. The rock has a high potential for water blocking damage and shows a medium to a strong performance of water sensitivity and stress sensitivity. Aiming to avoid these damages, one protective additive (microemulsion) is specifically designed. Through adsorption morphology test and core inhibition test, it shows that the newly developed microemulsion (0.5% concentration) could effectively weaken the inhibition effects induced by capillary pressure and decrease the flow back resistance of drilling fluid. Finally, a new drilling fluid using this new additive is designed and evaluated. The new drilling fluid works effectively in preventing water blocking by decreasing surface tension and transforming the wettability of tight sandstone from hydrophilic to intermediate wet This contributes to the significant recovery of formation permeability (more than 92.1%) and the increasing of gas production.
引用
收藏
页码:101 / 111
页数:11
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