【摘要】：欠平衡鉆井又被稱為負(fù)壓鉆井,是指在鉆井時(shí)井底壓力小于地層壓力,地下流體有控制地進(jìn)入井筒并且循環(huán)到地面上的鉆井技術(shù)。本文研究了充氮?dú)馇菲胶忏@井技術(shù),從牛東區(qū)塊的地質(zhì)特征到欠平衡鉆井技術(shù)的可實(shí)施性進(jìn)行了綜合分析。分別對(duì)充氮?dú)忏@井氣體、液體注入?yún)?shù)、鉆井液性能要求、復(fù)合鉆井技術(shù)、完井技術(shù)以及設(shè)備配套技術(shù)進(jìn)行了闡述。一、牛東區(qū)塊目的層P1k地層為火成巖,裂縫、孔洞發(fā)育,使用常規(guī)鉆井機(jī)械鉆速低,極易發(fā)生井下漏失,情況復(fù)雜,采用充氮?dú)馇菲胶忏@井有效的解決了這一問題。二、充氮?dú)馇菲胶忏@井技術(shù)能夠大幅降低鉆井液對(duì)儲(chǔ)層的傷害,增加儲(chǔ)層的產(chǎn)出能力。三、充氮?dú)馇菲胶饩问褂酶咝DC鉆頭配合直螺桿進(jìn)行復(fù)合鉆進(jìn),有效的解決了牛東區(qū)塊火成巖井段機(jī)械鉆速慢的問題。四、牛東區(qū)塊開發(fā)井中大規(guī)模應(yīng)用充氮?dú)馇菲胶饧夹g(shù),如果采用不壓井起下鉆裝置或套管閥等輔助設(shè)備完成欠平衡,該部分設(shè)備所占充氮?dú)馇菲胶忏@井總成本比例為30-40%左右,將導(dǎo)致充氮?dú)馇菲胶忏@井的成本進(jìn)一步增加,必須降低開發(fā)成本,提高綜合開發(fā)效益。GBC凍膠封隔井筒技術(shù)實(shí)現(xiàn)了充氮?dú)馇菲胶忏@井不壓井情況下的完井技術(shù),成功的降低了成本。
[Abstract]:Underbalanced drilling, also called negative pressure drilling, refers to the drilling technology in which the bottom hole pressure is less than the formation pressure, and the underground fluid enters the wellbore and circulates to the ground in a controlled way. In this paper, the underbalanced drilling technology with nitrogen filling is studied, and the comprehensive analysis is made from the geological characteristics of Niudong block to the feasibility of underbalanced drilling technology. The drilling gas, liquid injection parameters, drilling fluid performance requirements, compound drilling technology, completion technology and equipment matching technology are described respectively. First, the P1k formation in the target layer of Niudong block is igneous rock, fracture, hole development, low drilling speed using conventional drilling machine, easy to occur underground leakage and complex situation. This problem is effectively solved by nitrogen filling underbalanced drilling. Secondly, nitrogen-filled underbalanced drilling technology can greatly reduce the damage of drilling fluid to reservoir and increase reservoir productivity. Thirdly, the low drilling speed of igneous rock section in Niudong block is effectively solved by using high efficiency PDC bit and straight screw to carry out compound drilling in the underbalanced section of nitrogen filling. Fourth, in the development wells of Niudong block, the technology of filling nitrogen gas underbalance is applied on a large scale. If the auxiliary equipment, such as drilling device or casing valve, is used to complete the underbalance, This part of the equipment accounts for about 30-40% of the total cost of nitrogen-filled underbalanced drilling, which will further increase the cost of nitrogen-filled underbalanced drilling, and the development cost must be reduced. In order to improve the comprehensive development benefit, GBC gel sealing and isolating wellbore technology has realized the completion technology under the condition of filling nitrogen gas underbalanced drilling without well killing, and the cost has been reduced successfully.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TE242

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本文編號(hào)：2387689