CAJ | 학술논문

为解决南海莺歌海盆地乐东221气田表层松软地层定向造斜扩眼钻进困难、邻井相碰及易产生新井眼等钻井工程技术难题，提出了一种先钻小尺寸领眼，再用新型三级固定翼扩眼器定向扩眼，然后下入套管的海洋表层钻井技术。结合随钻测量仪和电子陀螺测斜仪钻进乐东221气田A14H井表层时，先用φ250.8 mm钻具定向造斜、钻小领眼，再用φ254.1 mm ×φ349.3 mm ×φ444.5 mm新型扩眼器将领眼定向扩眼至φ444.5 mm ，下入φ339.7 mm表层套管并固井。现场应用表明，该技术解决了丛式井表层防碰难题，保障了疏松地层的造斜钻进效果，防止了钻井中扩眼钻具对领眼井造斜效果的不利影响，对后续类似井的钻井具有一定的借鉴价值。
위해결남해앵가해분지악동221기전표층송연지층정향조사확안찬진곤난、린정상팽급역산생신정안등찬정공정기술난제，제출료일충선찬소척촌령안，재용신형삼급고정익확안기정향확안，연후하입투관적해양표층찬정기술。결합수찬측량의화전자타라측사의찬진악동221기전A14H정표층시，선용φ250.8 mm찬구정향조사、찬소령안，재용φ254.1 mm ×φ349.3 mm ×φ444.5 mm신형확안기장령안정향확안지φ444.5 mm ，하입φ339.7 mm표층투관병고정。현장응용표명，해기술해결료총식정표층방팽난제，보장료소송지층적조사찬진효과，방지료찬정중확안찬구대령안정조사효과적불리영향，대후속유사정적찬정구유일정적차감개치。
In order to solve problems that occurred when drilling shallow soft formation in the LD22 1 Gas Field ,in the Yinggehai Basin of the South China Sea ,including problems in directional drilling ,rea‐ming ,building angle ,borehole collision of the adjacent wells ,a new technology was developed .It involved drilling a small‐sized pilot hole at first ,and then using special three‐stage reamer to directionally reaming it , followed by then running surface casing .Combined MWD with gyro inclinometer ,a small pilot hole of φ250.8 mm was drilled with directional drilling tools in Well A14H in LD22 1 Gas Field ,and then it was reamed to theφ444.5 mm by the special reamer with three‐stage reaming sizes of φ254.1 mm ×φ349.3 mm ×φ444.5 mm ,finally theφ339.7 mm casing was run in hole and cemented .Drilling practices showed that the technology successfully prevented the borehole from colliding in cluster wells in shallow formations successfully .It also ensured the effect of directional drilling and building up ,and eliminated the unfavorable effect of reamer on building up in pilot hole .The study concluded that it would be an useful reference for drilling in similar shallow soft formations .