大庆油田徐深气田分层压裂与测试一体化技术

Separate-layer fracturing-testing integrated technology for Xushen gasfield,Daqing oilfield

为了解决气井单一层系开采产量低、产能递减快,多层位高、低压层合采及层间干扰和产气层贡献率认识不清的矛盾,以位于松辽盆地北部深层构造单元徐家围子断陷徐中构造带上火山岩徐深气田为研究对象,在综合分析气田开发现状的基础上,开展了深层气井分层压裂监测一体化技术研究。通过物理、化学、材料、机械等多学科综合研究,研发出国内技术领先的井下压裂及测试工具,实现了一趟管柱分层压裂、分层测试。研究结果表明:①分层压裂及测试一体化工艺可实现一趟管柱具有压裂、完井、测试功能,该工艺满足井深大于3000 m气井2~4层的分层压裂、分层测试要求;②可溶球座材料经过多次室内实验评价优选,表面经特殊处理,耐冲蚀防腐蚀性能强,满足压裂施工过程中不溶解,而压后快速溶解要求。结论认为,压裂及测试一体化工艺的成功应用,解决了多层同采产层贡献率测试不清的问题,缩短了气井作业周期,降低了施工风险和成本,成为了实现徐深气田高效开发的一项可靠技术手段。

When single-layer production used in one gas well,the production rate is often low and the productivity declines fast.Whereas when commingled production used in some layers with high or low pressure,there is interlayer interference and the contribution rate in gas-producing layers is not made clear.So,Xushen volcanic gasfield,Xuzhong structure belt,Xujiaweizi rift in deep structure of northern Songliao Basin,was taken as an objective to study the separate-layer fracturing-testing integrated technology for deep wells after comprehensive analysis on field development.Then,by means of multidisciplinary study on physics,chemistry,material and mechanics,some fracturing-testing tools which are China’s leading ones were developed,and separate-layer fracturing and testing in one trip was realized.Results show that,the separate-layer fracturing-testing integrated technology can not only realize fracturing,completion,and testing in one trip,but also meet the requirement for separate-layer fracturing and testing on 2-4 layers in 3000-m-deep wells.The material of soluble ball seat is selected through multiple experiments and its surface is treated specially,so it has strong erosion and corrosion resistance to meet the insoluble requirement during fracturing or quick solution after fracturing.In conclusion,after successful application of this integrated technology,the contribution rate in each producing layer during commingled production is tested clearly,the operation cycle is shortened,and both construction risk and cost are reduced.As a result,the integrated technology is reliable to realize efficient development in Xushen gasfield.