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涪陵頁巖氣水平井油基鉆井液技術(shù)

文檔作者：梁文利宋金初陳智源劉靜梅露強(qiáng) 文檔來源：中石化江漢石油工程公司頁巖氣開采技術(shù)服務(wù)公司		點(diǎn) 擊數(shù)：	更新時(shí)間： 2023年10月05日
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第33卷第5期
2016年9月
鉆井液與完井液
DR【LLING FLUID&amp;amp;COMPLETl0N FLUID
、，01．33 No．5
Sept．2016
doi：10．3696／j．issn．1001-5620．2016．05．004
涪陵頁巖氣水平井油基鉆井液技術(shù)
梁文利， 宋金初， 陳智源， 劉靜， 梅露強(qiáng)
(中石化江漢石油工程公司頁巖氣開采技術(shù)服務(wù)公司，武漢430072)
梁文利等．涪陵頁巖氣水平井油基鉆井液技術(shù)[J]．鉆井液與完井液，2016，33(5)：19．24．
摘要涪陵焦石壩區(qū)塊采用水平井開發(fā)方式，水平段長(zhǎng)1 500 m以上，水平井段為龍馬溪組下泥巖段，頁巖黏土礦物
含量高，脆性強(qiáng)、微裂縫發(fā)育，易發(fā)生垮塌掉塊造成井下事故；井底垂深大于3 500m，深層頁巖氣開發(fā)，面臨著井溫升高、
攜巖帶砂要求越來越高、部分井發(fā)生垮塌掉塊、起下鉆遇阻卡的問題，部分井發(fā)生失返性漏失，消耗了大量的人力、物力。
對(duì)柴油基鉆井液體系進(jìn)行了研究，結(jié)果表明該體系具有良好的抗溫性、在低油水比(70：30)下仍然具有穩(wěn)定的性能．隨
鉆堵漏材料(粒徑級(jí)配的高純超細(xì)碳酸鈣+有機(jī)膠凝漏失控制材料)能夠封堵2 inln的裂縫，承壓強(qiáng)度達(dá)7 MPa，納米封
堵劑(納米石墨粉和超細(xì)海泡石纖維組成的混合物)能夠封堵0．1 mm裂縫，承壓達(dá)到20 MPa?，F(xiàn)場(chǎng)應(yīng)用結(jié)果表明，該體
系具有良好的井壁穩(wěn)定能力，井徑擴(kuò)大率低，平均小于3％，潤(rùn)滑性好，起下鉆摩阻低，鉆井液性能穩(wěn)定，易于維護(hù)處理，
能夠解決井漏、井垮等復(fù)雜情況。柴油基鉆井液完全適用于涪陵區(qū)塊的頁巖氣水平井鉆井施工。
關(guān)鍵詞頁巖氣；柴油基鉆井液；水平井；井壁穩(wěn)定；焦石壩區(qū)塊
中圖分類號(hào)：TE254．3 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1001．5620(2016)05．0019-06
Oil Base Drilling Fluid for Drilling Shale Gas WeUs in Fuling
LIANG Wenli，SONG Jinchu，CHEN Zhiyuan，LIU Jing，MEI Luqiang
(Shale Gas Production Service，Sinopec Jianghan Oilfield Service Corporation，Wuhan，Hubei 430072)
Abstract Hofizonml drilling has been used in developing the block Jiaoshiba in Fuling，Chongqing．The horizontal section，more than
l，500 m in length，penetrated the lower Longmaxi mudstone formation，which has high clay contents，and is brittle and full ofmicro
fractures．The vertical depths ofthe wells drilled in this area were deeper than 3，500 m．Deep well shale gas development in this area
has been faced with difficulties such as high well temperature，cutting carrying，borehole wall collapse in some wells，over-pulls during
tripping，and lost returns of muds in some wells，all of these have caused waste of manpower and material resources．To solve these
problems，a diesel oil base drilling fluid has been studied for use in shale gas drilling．The diesel oil base drilling fluid formulated had
good high temperature stability；at low oiFwater ratio(70：30)the fluid was still stable．Two LCMs，were added in the oil base drilling
fluid；one Was a high purity ultra-fine CaC03 mixed with an organic gel LCM which call plug fractures of2 mill in width，and Can stand
pressure of7 MPa．The other LCM，a nano graphite powder mixed with ultra-fine sepiolite fibers，can be used to plug micro fractures of
0．1 mm in width,and Can stand pressure of20 MPa．Field application demonstrated that this oil base mud greatly stabilized the borehole
wall in easy-to-collapse hole sections．a(chǎn)nd reduced the average rate ofhole diameter enlargement to less than 3％．Good lubricity ofthe
mud made trip very smooth．The property ofthe mudwas stable during the whole drilling period and was easy to maintain．Downhole
problems previously encountered such as lost circulation and borehole wall instability were mitigated to acceptable levels．Field
application proved the suitability ofdiesel oil base drilling fluid in shale gas horizontal drilling in Fuling area．
Key words Shale gas；Diesel oil base drilling fluid；Horizontal well；Borehole stabilization；Block Jiaoshiba
焦石壩頁巖氣區(qū)塊位于川東南地區(qū)川東高陡褶
皺帶包鸞一焦石壩背斜帶焦石壩構(gòu)造，目的層以黑
色粉砂巖、炭質(zhì)泥頁巖夾放射蟲炭質(zhì)泥頁巖為主，
該層位泥頁巖層理和裂縫非常發(fā)育，鉆井過程中極
易發(fā)生井壁坍塌，預(yù)測(cè)地層壓力系數(shù)高達(dá)1．45，采
用水平井鉆進(jìn)泥頁巖地層，施工風(fēng)險(xiǎn)大，鉆井和完
第一作者簡(jiǎn)介：梁文利，工程師，現(xiàn)在主要從事鉆井液技術(shù)研究及現(xiàn)場(chǎng)技術(shù)服務(wù)工作。電話15826568878；E-mail：
nijian92007@163．corno

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