强力网堵漏技术及施工工艺分析

Analysis of Continuous Sealing Technology and Operation Process

南海海域新近系珠江组地层广泛发育灰岩裂缝,连通性好,易漏失。分别是陆丰、惠州两个区块,井漏事故,主要集中在新近系珠江组灰岩、砂岩及灰质粉砂岩层段,漏失现象存在于正常钻进、处理井下事故、起钻及测压作业等过程中。灰岩地层漏失具有速度快、常规堵漏手段见效慢、损失时间长的特点,因此,针对这种漏失情况,分析了漏失机理,针对珠江组灰岩地层微孔隙及微裂缝扩展导致的裂缝扩展性漏失,剔除了一种强力网堵漏材料NETLOCK,实验室性能表明其具可以显著提高堵漏成功率,具有很高的推广意义。

Limestone fractures are widely developed in Neogene the Pearl River Formation in the South China Sea,with good connectivity and easy leakage.Also in Lufeng and Huizhou blocks,the lost circulation accidents are mainly concentrated in the limestone,sandstone and calcareous siltstone intervals of the Neogene the Pearl River Formation.The lost circulation phenomenon exists in the process of normal drilling,handling downhole accidents,tripping out and pressure measurement operations.The leakage of limestone formation has the characteristics of fast speed,slow effect of conventional plugging methods and long loss time.This paper analyzes the leakage mechanism in view of this leakage situation.In view of the fracture propagation leakage caused by the expansion of micro pores and micro fractures in limestone formation of the Pearl River Formation,a continuous sealing material NETLOCK is removed.The laboratory performance shows that it can significantly improve the success rate of plugging,and has a high popularization significance.