金坛盐穴储气库定向井提高盐岩利用率研究与应用

为解决盐穴储气库区块内布井困难、建井数量少、库容量和工作气量达不到区块建库需求等问题，通过定向井井眼轨道设计、套管下入等问题分析，提出适用于金坛盐矿区地质条件的盐穴储气库丛式定向注采井的设计方案，区块布井数量由前期可研方案的12口井，调整至20口井。定向井布井方式较常规直井布井方式井数增加60%以上，经济效益和社会效益明显。实践表明，定向钻井适合于金坛区块情况，可明显增加区块库容量，最大限度合理利用盐矿资源。金坛地区现场实施定向井18井次，井筒质量等各项参数符合建库需求，未来可扩大至其他盐穴储气库区块，对加快国内盐穴储气库建库效率具有重要意义。

Applying directional wells to improve the salt rock utilization ratio in Jintan salt-cavern gas storage

In order to solve the problems in the block of salt-cavern underground gas storage (UGS), such as difficult well arrangement, fewer wells, insufficient storage capacity and working gas volume to meet the UGS building need of the block, this paper analyzed directional well trajectory design, casing running and other problems, and then put forward the design scheme of cluster direction injection/production well in salt-cavern underground gas storage suitable for the geological conditions in Jintan Salt Mine. According to the scheme, the number of wells in the block is increased from 12 (early feasibility scheme) to 20. Compared with the conventional pattern shape of vertical well, the pattern shape of directional well increases the number of wells by 60 % and its economical and social benefits are more remarkable. Practice indicates that directional drilling is suitable for Jintan Block, and it can increase the storage capacity greatly and make rational use of the salt mine resources to the uttermost. It has been applied on site 18 well times in Jintan Block. It is shown that all parameters of well quality satisfy the UGS building requirements. Therefore, it can be applied to the other salt-cavern UGS blocks and it is of great significance to accelerate domestic salt-cavern UGS building efficiency.