【摘要】：S區(qū)塊位于俄羅斯薩哈林島東部海域,計(jì)劃采用大位移井海氣陸采技術(shù)進(jìn)行開(kāi)發(fā)。該區(qū)設(shè)計(jì)井深達(dá)12 000 m(垂深為2 800 m),水平位移約11 000 m,水平位移與垂直深度之比達(dá)3.93,初步設(shè)計(jì)四開(kāi)井身結(jié)構(gòu)。以往直井鉆探表明,該區(qū)奧科貝凱組(Okobykaiskiy)下部及達(dá)吉組(Daginskiy)地層安全鉆井液密度窗口窄(約0.3~0.4 g/cm3)、漏、塌、卡風(fēng)險(xiǎn)高,而大位移開(kāi)發(fā)井相應(yīng)井段窄安全密度窗口問(wèn)題愈加突出。針對(duì)當(dāng)前對(duì)于擴(kuò)展窄安全密度窗口相關(guān)研究的不足、特別是局限于通過(guò)鉆井液性能優(yōu)化擴(kuò)展安全密度窗口的現(xiàn)狀,圍繞窄安全密度窗口大位移井鉆井難題,提出應(yīng)綜合力學(xué)、化學(xué)多手段全方位擴(kuò)展窄安全密度窗口:首先,自井眼軌跡設(shè)計(jì)環(huán)節(jié)將優(yōu)化井身剖面、改善井周?chē)鷰r應(yīng)力狀態(tài)、擴(kuò)展安全密度窗口有機(jī)結(jié)合起來(lái),開(kāi)展井眼軌跡主要參數(shù)對(duì)安全密度窗口的影響規(guī)律分析,在此基礎(chǔ)上,兼顧井眼軌跡控制難度及施工摩阻等因素優(yōu)化井眼軌跡,降低坍塌壓力、提高地層破裂壓力,實(shí)現(xiàn)安全密度窗口的先期擴(kuò)展,為后續(xù)通過(guò)優(yōu)化鉆井液性能等手段進(jìn)一步提高安全密度窗口奠定良好基礎(chǔ),并最終為窄安全密度窗口安全、高效鉆井創(chuàng)造有利條件。研究形成的擴(kuò)展密度窗口相關(guān)技術(shù)在S區(qū)塊大位移井鉆井設(shè)計(jì)中成功應(yīng)用,使得目標(biāo)層段安全密度窗口較軌跡優(yōu)化前擴(kuò)展幅度達(dá)25%~100%,對(duì)窄安全密度窗口難題的應(yīng)對(duì)及防治具有指導(dǎo)意義。
[Abstract]:S block is located in the eastern sea area of Sakhalin Island in Russia and plans to be developed by sea-air and land mining technology in large displacement wells. The depth of the designed well in this area is 12 000 m (the vertical depth is 2 800 m), horizontal displacement is about 11 000 m), and the Prida of horizontal displacement and vertical depth is 3.93. The structure of the four opening wellbore is designed preliminarily. In the past, straight well drilling shows that the safety drilling fluid density window of the lower part of (Okobykaiskiy) and the (Daginskiy) formation of Dagi formation in this area is narrow (about 0.3 g/cm3), and the risk of leakage, collapse and card is high, while the problem of narrow safety density window of the corresponding well section of large displacement development well is becoming more and more prominent. In view of the shortcomings of the related research on expanding the narrow safety density window, especially the present situation limited to the expansion of the safety density window through the optimization of drilling fluid performance, around the drilling problem of large displacement wells with narrow safety density window, it is proposed that the narrow safety density window should be expanded in an all-round way by means of comprehensive mechanics and chemistry. First, the wellbore profile will be optimized and the stress state of the rock around the well should be improved from the wellbore trajectory design link. The extended safety density window is organically combined, and the influence of the main parameters of wellbore trajectory on the safety density window is analyzed. On this basis, taking into account the difficulty of wellbore trajectory control and construction friction, the wellbore trajectory is optimized, the collapse pressure is reduced, the formation fracture pressure is increased, and the safety density window is expanded in advance. It lays a good foundation for further improving the safety density window by optimizing drilling fluid performance, and finally creates favorable conditions for narrow safety density window safety and high efficiency drilling. The extended density window correlation technology has been successfully applied in the drilling design of large displacement wells in S block, which makes the safety density window of the target segment expand by 25% 鈮，

本文編號(hào)：2518640