一种承压堵漏新方法的实验研究

Experimental Study on New Method for Pressurized Lost Circulation

钻井过程中会遇到一些微裂缝地层,这往往要引起井漏。轻微的井漏可能只是耗费处理时间及成本,而严重井漏则可能会诱发诸如井塌、卡钻、井喷等一系列复杂情况或者事故,这将不仅影响钻井工作的效率,还带来巨大的经济损失。所以,堵漏是钻井过程中必须经常面对的问题,能够低成本地实现承压堵漏对于钻井井漏的处理就显得格外重要。使用新的材料/方法来提高地层的承压能力,即在抗高温聚磺钻井液中加入矿渣(KZ),并在激活剂处理液中培养,配制出新型的堵漏钻井液体系。经过试验证明,加入KZ对钻井液常规性能的影响不大,不但能大幅度提高地层的承压能力,同时证明了激活剂对于激活KZ活性的可行性。对于抗高温聚磺钻井液,当KZ加量为30%、并且激活剂加量为30%时,试样的承压能力达到最大。此方法在一定程度上提高了微裂缝地层的承压能力。

Some fractured reservoirs might be penetrated during well drilling, resulting in lost circulation. If serious lost circulation occurs, complex conditions and accidents such as borehole collapse, pipe sticking and well blowout might occur, not only influencing the well drilling efficiency, but also causing great economic losses. Therefore, it is essential to plug the fractured lost channel with pressurized lost circulation method. By using new method, namely adding the gangue （KZ） in the anti-high temperature sulphoan- tion drilling fluid, and raising in the activator processing fluid, the new drilling fluid system can be developed, which can improve the compressive strength of the formation. The experimental results have demonstrated that adding KZ can enhance the drilling fluid performance effectively, and improve the compressive strength of the formation, but also had proven feasibility of the activator can activates the KZ activeness. Regarding anti-high temperature sulphoantion drilling fluid, when the KZ is 30% and the activator is 30%, compressive strength of the formation achieves in a big way. This method can he very good to deal with the pressurized lost cir- culation of fractured reservoirs.