摘要
实验考察了常用聚合醇特别是PE 1的应用性能,讨论了在钻井液中的抑制、堵孔、界面活性、提高渗透率恢复率等作用,简介了在塔里木盆地轮南古潜山地区2口深井钻井中的应用效果。3%PE 1使岩屑在清水中的回收率由10.8%提高到38.8%;加有聚合醇的钻井液滤饼表面有膜形成;3%PE 1使清水表面张力降到～37mN/m,使油水界面张力降到8.5mN/m;随聚合醇浓度增大,PE 1和JLX水溶液通过滤饼的滤失量减小,PE 1水溶液通过含人造裂缝岩心时的压差增大;5%PE 1使实验聚磺钻井液及2.0%或2.5%PE 1使LG101井井浆污染的含人造裂缝岩心的渗透率恢复率增大,聚合醇与超细碳酸钙合用时增加幅度更大。在LG100井和LG172井分别钻到5455和5440.9m时井浆滤失量较大而渗透率恢复率很小(26.7%和18.5%),调整配方并加入聚合醇(3%～5%)使滤失量减小,渗透率恢复率大幅上升到65.2%和64.2%。聚合醇作为钻井液处理剂,对裂缝型和微裂缝型碳酸盐岩地层有良好保护作用,与固相架桥粒子共用时保护作用更好。图4表5参2。
The performance properties of polyols and particularly of PE-1 are experimentally investigated, their functions of shale inhibition, pore plugging, interfacial activation, and core permeability recovery (CPR) enhancing are discussed and the results of using them in drilling in pay layers of 2 deep wells in Lungu (LG), Tarim, are presented. 3% PE-1 increases the recovery of cuttings in fresh water from 10.8% to 38.8%; a film is formed on the surfaces of filtration cake created by polyol drilling fluids; 3% PE-1 decreases the surface tension of fresh water to ～37 mN/m and the oil/water interfacial tension to 8.5 mN/m; a decrease in filtrate loss of aqueous polyol solution of PE-1 and JLX through filtrale cakes and an increase in flow pressure of polyol solution of PE-1 through fracture-containing cores (FCCs) are observed with increasing polyol concentration; introducing polyols enhances the CPR of the FCCs polluted by a laboratory polymer/sulfonate drilling fluid of polyol dosage 5% and by a drilling fluid in use in well LG101 of polyol dosage 2% or 2.5% and the increment of CPR is more larger when the polyols are introduced together with ultrafine CaCO_3. For the drilling-in fluids of wells LG100 (in depth 5455.0 m) and LG172 (5440.9 m), CPR value was dramatically increased from 26.7% and 18.5% to 65.2% and 64.2% and the filtrate losses became satisfactory in result of fluid composition adjusting and polyols introducing in the drilling course. The protection of fissured and microfissured carbonatestone reservoir formations by the polyols in water base drilling fluids is fairly satisfactory and is improved with bridging solid particles introduced additionally.
出处
《油田化学》
CAS
CSCD
北大核心
2004年第3期205-208,共4页
Oilfield Chemistry
关键词
聚合醇
滤失量
钻井液
渗透率
裂缝性储层
岩心
恢复率
PE
超细碳酸钙
水溶液
polyols
drilling fluid additive
performance properties
functioning mechanisms
reservoir protection
polyol drilling fluids
fissured reservoirs
carbonatestone reservoirs
Lungu district in Tarim
