三维水平井YP-3X井钻井难点与对策

Difficulties and Countermeasures of 3DHorizontal Well Drilling in YP-3X Well

鄂尔多斯盆地致密油资源丰富、分布广泛,是长庆油田建设西部大庆战略目标的重要接替区。但其岩性致密、渗透率低、储层物性差,且主要分布于井场受限的沟壑地带,目前应用较为广泛的水平井钻井技术难以实现经济有效开发。国内外油气田开发实践表明,丛式水平井能够大幅缩减投资成本,提高油田经济效益。为探索丛式水平井开发模式,形成鄂尔多斯盆地致密油藏钻井核心技术,针对三维水平井轨迹控制、泥岩失稳垮塌、管串下入摩阻大等难题开展攻关与实践,并在YP-3X井进行了先导性试验。YP-3X井系阳字水平井组一口偏移距超过300m、水平段超过1500m的三维水平井,该井的成功实施突破了丛式水平井瓶颈技术难题,形成了以井身结构优化、剖面轨迹控制、泥页岩防塌等技术集成配套的三维水平井钻井技术,为长庆油田规模开发致密油藏奠定了一定的技术基础。

In Ordos Basin tight oil resources were rich with wide distribution,it was the an important area for establishing a western Daqing Oilfield in the development strategy of Changqing Oilfield.But it had dense rock,poor reservoir property and low pressure,and oilfield was located in the ravine and valley where well site was limited.It was difficult to achieve the economic and effective development of the tight oil by horizontal well drilling technology.Internal and external exploitation practice indicated that cluster horizontal well could greatly reduce investment cost,rise economic benefit in oilfields.For exploring cluster horizontal well development mode,developing the core drilling technique of tight oil reservoirs in Ordos Basin,researches and development were performed in consideration of the problems of 3Dtrajectory control of horizontal wells,instability and collapse in mudstones and high friction of pipe strings,and a pilot test was carried out in Well YP-3X.Well YP-3Xwas a 3Dhorizontal well with offset distance of more than 300mand horizontal section of more than1500m.The technique is successfully used in cluster well drilling,by which the technical bottleneck problem is broke through,the integrated 3Dand matched horizontal well drilling technique including well bore optimization,trajectory control and anti-collapse of mudstone and shale is established,it provides technical basis for tight reservoir development in Changqing Oilfield.