【摘要】：LS25-1S-1深水高溫高壓井實(shí)鉆井深為4 448 m,完鉆層位為梅山組,采用六開井身結(jié)構(gòu),φ212.7 mm井段為目的層段,壓力系數(shù)預(yù)測為1.70~1.84,安全密度窗口窄,需重點(diǎn)關(guān)注井控、防漏和水合物生成的預(yù)防;同時(shí)由于井底溫度約為147℃,而出口溫度只有17℃,保持鉆井液在高密度下的高、低溫穩(wěn)定性、防重晶石沉降、良好流變性和儲(chǔ)層保護(hù)是該井段技術(shù)重點(diǎn)。以LS區(qū)塊氣源為研究對(duì)象,通過利用水合物抑制軟件Hydra FLASH繪制不同抑制劑濃度下水合物P-T相圖,優(yōu)選出鉆進(jìn)及靜止期間水合物抑制配方:(9%~15%)Na Cl+5%KCl+10%KCOOH+(0~45%)乙二醇。選用了抗高溫降濾失劑HTFL,其加量為0.8%時(shí)體系高溫高壓濾失量小于10 m L,泥餅質(zhì)量好。研發(fā)了一種新型的封堵劑PFFPA,PF-FPA較FLC2000具有更好的封堵降濾失效果。性能評(píng)價(jià)結(jié)果表明,該體系抗溫達(dá)170℃,高低溫流變性平穩(wěn),能抗10%的鈣土污染,而且沉降穩(wěn)定性好,封堵能力強(qiáng),滲透率恢復(fù)值在80%以上,儲(chǔ)層保護(hù)效果好。在現(xiàn)場應(yīng)用中,通過Drill Bench軟件模擬,將排量降至1 400 L/min,此時(shí)ECD為1.94 g/cm3,小于漏失壓力當(dāng)量密度(1.96 g/cm3),ROP為10 m/h,巖屑傳輸效率仍在85%以上,滿足攜巖要求。該井順利完鉆,表明該套鉆井液技術(shù)解決了現(xiàn)場作業(yè)難題。
[Abstract]:The drilling depth of LS25-1S-1 deep water high temperature and high pressure well is 4 448 m, the complete drilling horizon is Meishan formation, the well body structure is adopted, the 蠁 212.7 mm well section is the target interval, the pressure coefficient is predicted to be 1. 70 ~ 1. 84, and the safe density window is narrow. The prevention of well control, leakage prevention and hydrate formation should be paid more attention to. At the same time, because the bottom hole temperature is about 147 鈩，

本文編號(hào)：2401152