發(fā)布時間：2018-10-16 17:41

【摘要】：深水鉆井面臨低溫、安全密度窗口窄、淺層氣易形成氣體水合物、井壁易失穩(wěn)等技術難題,對深水鉆井液提出了更高的要求。以Saraline 185V氣制油為基油,通過優(yōu)選乳化劑、有機土、降濾失劑及其他處理劑,構建了一套適合深水鉆井的FLAT-PRO深水恒流變合成基鉆井液體系。綜合性能評價結果表明:該鉆井液在4~65℃下流變性能穩(wěn)定,具有恒流變特性,能有效保護儲層,其滲透率恢復值大于90%,能抗10%海水、15%鉆屑污染,易降解,滿足環(huán)保要求。南海LS-A超深水井水深為1 699.3 m,預測主要目的層溫度為34.6~36℃,φ508 mm套管鞋處的地層承壓能力系數(shù)低于1.14,安全密度窗口窄,如何控制ECD值、預防井漏是該井的作業(yè)控點,因此選擇密度為1.03 g/cm~3的FLAT-PRO鉆井液開鉆。鉆進過程中,使用FSVIS調整流變性,維護黏度在50~70 s,動切力在8~15 Pa,φ6讀數(shù)為7~15,φ_3讀數(shù)為6~12,用2%PF-HFR控制濾失量,應用井段起下鉆順利,電測順利,井徑規(guī)則,沒有出現(xiàn)任何復雜情況。應用結果表明,FALT-PRO深水恒流變合成基鉆井液在不同溫度下的流變性能穩(wěn)定,抑制性好,潤滑性強,能獲得較低的ECD值,滿足深水鉆井的要求。
[Abstract]:Deep-water drilling is faced with some technical problems such as low temperature, narrow safe density window, gas hydrate formation in shallow layer gas and instability of borehole lining, which puts forward higher requirements for deep water drilling fluid. A set of FLAT-PRO deepwater constant flow synthetic base drilling fluid system suitable for deep water drilling was constructed by using Saraline 185V gas as the base oil, through the optimal selection of emulsifier, organic soil, filtration reducer and other treatment agents. The comprehensive performance evaluation results show that the drilling fluid has stable rheological properties at 465 鈩，

本文編號：2275144