摘要
采用环保型表面活性剂、助表面活性剂、油和水研制了一种煤层气压裂用微乳解吸附剂,其外观为淡蓝色透明液体,内相的油相粒径为10～100 nm.由于其与煤岩的作用力强于甲烷气与煤岩的作用力,故其可以置换出煤岩中的甲烷气,使甲烷气解吸;同时由于解吸附剂具有较低的表面张力和增大液体与岩石接触角的性质,可以降低液体返排的毛管力,使液体易于返排,增大气相相对渗透率;解吸附剂粒径较小,可以进入更小的岩石孔隙,降低“水锁”伤害.通过实验室评价得出,解吸附剂的解吸附效率比活性水提高8.3％,助排效率比常规表面活性剂提高15％,对岩心伤害降低3.6％,具有“一剂多效”的效果.现场应用一口井,套压恢复快、恢复早,产量较高.
A micro-emulsion desorption agent used in coal-bed methane(CBM) fracturing was formulated using surfactant,cosurfactant,oil and water.It's a light blue fluid whose particle size varies from 10 to 100 nanometers.The bond force between desorption agent and coal is stronger than methane,so it can be employed as desorption agent to replace the methane.Because of its low surface tension,higher contact angle,the capillary pressure is reduced,which is good for fluid flowback and gas permeability.Desorption agent can get into smaller pore,which means 'water block' can be reduced in some extent.Laboratory evaluations shows that it's desorption efficiency was 8.3%higher than active water(2%KCI),flowback efficiency was improved by 15%than common surfactants and core damage was reduced by 3.6%.Desorption agent with multi functions was applied in one CBM well.Result shows that the well has earlier,faster casing pressure recovery and higher yield.
出处
《钻井液与完井液》
CAS
北大核心
2013年第6期61-63,96,共3页
Drilling Fluid & Completion Fluid
基金
国家重大专项项目(2011ZX05037)资助
关键词
煤层气
压裂
解吸附剂
返排
CBM
Fracturing
Desorption agent
Flowback
