CAJ | 학술논문

青海涩北气田位干柴达木盆地东部三湖地区,平均海拔2 700 m左右,地表为盐碱滩,寸草不生.该气田的井存在地层缩径严重、起下钻遇阻遇卡、盐水侵、井漏频繁、测井一次成功率低、钻井速度慢等钻井技术难题.为加快建设高原千万吨级油气田,开展了青海涩北气田优快钻井技术项目,研究了由高矿化度地层复合盐水配制的强包被聚合物钻井液技术,并在涩北气田第四系含盐地层试验成功,形成了配套的钻井液配制工艺和维护处理技术措施.该钻井液具有优异的包被抑制能力,解决了制约涩北气田钻井提速的起下钻遇阻遇卡、测井一次成功率低等技术瓶颈,对提高涩北气田钻井速度、保护产层、加快气田开发等方面起到了一定的促进作用.
청해삽북기전위간시체목분지동부삼호지구,평균해발2 700 m좌우,지표위염감탄,촌초불생.해기전적정존재지층축경엄중、기하찬우조우잡、염수침、정루빈번、측정일차성공솔저、찬정속도만등찬정기술난제.위가쾌건설고원천만둔급유기전,개전료청해삽북기전우쾌찬정기술항목,연구료유고광화도지층복합염수배제적강포피취합물찬정액기술,병재삽북기전제사계함염지층시험성공,형성료배투적찬정액배제공예화유호처리기술조시.해찬정액구유우이적포피억제능력,해결료제약삽북기전찬정제속적기하찬우조우잡、측정일차성공솔저등기술병경,대제고삽북기전찬정속도、보호산층、가쾌기전개발등방면기도료일정적촉진작용.
Sebei gas field is located in Qaidam Basin in Qinghai and has an average sea level of 2,700 m. The surface of this gas field is covered with a salina and no vegetation can be found in this area. Wells drilled in this gas field have encountered several kinds of downhole problems such as severe tight hole, drag and pipe sticking during trip, saltwater cut, frequent mud losses, difficulties in well logging and low ROP etc. Field analysis and laboratory study showed that the formation saltwater has a high salinity and can be used in formulating polymer drilling fluids. One inhibitive polymer drilling formulated with the formation water was used successfully in drilling the Quaternary salt formations, remarkably minimizing the downhole problems encountered previously.