【摘要】：頁巖氣水平井鉆進中常采用油基鉆井液體系來解決頁巖井壁失穩(wěn)問題,但卻面臨廢棄油基鉆井液和油基后期巖屑處置的環(huán)保問題,因而迫切需要研制一種能防止頁巖垮塌的水基鉆井液來替代油基鉆井液。為此,在分析四川盆地長寧—威遠地區(qū)頁巖礦物組分和微觀結(jié)構(gòu)的基礎(chǔ)上,對構(gòu)成防塌水基鉆井液體系的關(guān)鍵處理劑,如封堵劑、抑制劑、潤滑劑等進行了評價和優(yōu)選,并確定了加量范圍;然后通過室內(nèi)配伍實驗和復核,研制出防塌水基鉆井液體系并對其性能進行了評價。結(jié)果表明,該鉆井液的封堵性、抑制性、潤滑性等性能均優(yōu)于該區(qū)使用的聚磺鉆井液、聚合物鉆井液,接近或達到油基鉆井液的水平。在長寧—威遠國家級頁巖氣示范區(qū)進行的水平井鉆進現(xiàn)場試驗結(jié)果表明,該鉆井液體系密度可達到2.31 g/cm~3,抗溫能力達到130℃,在造斜段和水平段表現(xiàn)出良好的封堵能力和抑制能力,具有很好地防塌效果。該鉆井液體系對實現(xiàn)該區(qū)頁巖氣的清潔生產(chǎn)與效益開發(fā)將發(fā)揮重要作用。
[Abstract]:Oil based drilling fluid system is often used in shale gas horizontal well drilling to solve the problem of shale sidewall instability, but it is faced with the environmental protection problem of waste oil based drilling fluid and late oil based cuttings disposal. Therefore, it is urgent to develop a water-based drilling fluid that can prevent shale collapse to replace oil-based drilling fluid. Based on the analysis of shale mineral composition and microstructure in Changning-Weiyuan area of Sichuan Basin, the key additives, such as plugging agent, inhibitor, lubricant and so on, which constitute anti-sloughing water base drilling fluid system, are evaluated and optimized. The range of adding amount was determined, and then the anti-sloughing water-based drilling fluid system was developed and its performance was evaluated by laboratory compatibility experiments and rechecking. The results show that the performance of this drilling fluid is better than that of polysulfonated drilling fluid, polymer drilling fluid and oil base drilling fluid. The field test results of horizontal well drilling in Changning Weiyuan National Shale Gas demonstration area show that the density of the drilling fluid system can reach 2.31 g / cm ~ (3), and the temperature resistance ability reaches 130 鈩，

本文編號：2140940