Abstract: Sulige Gas Field is a low-pressure, low-porosity and low-permeability gas reservoir of stratigraphic lithological trap, for which conventional development method does no achieve satisfactory development results. The staged fracturing tools for open hole of horizontal well is developed in the light of the characteristics of Sulige Gas Field, such as rapid pressure decline and poor communications of sand bodies.As for the well based on open hole completion, open-hole packer is suspended at the designated wellbore section with sliding sleeve started by pressure and sliding sleeve by thrown ball so that staged isolation is horizontally selected in the fractured wellbore section. Staged fracturing is conducted according to the number of fractured sections. Fracturing operation for the whole section is completed by one string of pipes, thus enlarging the filtrating area, making more sand bodies communicate, and fulfilling the objective of high-efficiency development. This paper briefs about the relative systematic tools and indoor test, field application and operational application as wellasthe efforts fora large-scale application.

Key words: horizontal well, open hole completion, selectivestagedfracturing, fracturing tools

摘要： 苏里格气田属地层岩性圈闭性低压、低孔、低渗气藏,采用常规开发方式开发效果不佳。针对苏里格气田压力下降快、砂体连通性差等特点,开发了水平井裸眼分段压裂工具。对裸眼完成的井,在预定井段悬挂裸眼封隔器、压力开启滑套、投球开启滑套等工具,实现压裂作业井段横向选择性分段隔离。根据压裂段数进行分段压裂,一趟管柱实现全井段的压裂作业,从而扩大渗流面积,沟通更多的含气砂体,实现高效开发的目的。介绍了相关配套工具与室内试验、现场试验及作业应用情况,逐渐实现了规模化应用。

关键词: 水平井, 裸眼完井, 选择性分段压裂, 压裂工具