Development and application of hollow ground anchor for horizontal wells

In view of the fact that the prestressed solid anchor for cementing now available in domestic market is mainly used in vertical wells and can not be used in horizontal wells, a hollow ground anchor has been developed for horizontal well, used to address the problems such as wellhead lift and oil/gas escaping from wellhead, during steam injection in horizontal wells for heavy oil thermal recovery. This hollow ground anchor for horizontal well is connected onto the completion string in horizontal wells for heavy oil thermal recovery, which combines with the technology of cement displacement technology on the top of screen tube to carry out lifting and prestressed operation. This will not affect the drilling and cementing and subsequent oil production sequence, and also will not affect the cementing quality in large deviated sections. This paper presents the structure, working principle, performance characteristics and technical specifications of this ground anchor; and stress analysis and indoor tensile test were conducted to the ground anchor flukes, which were all up to the designed indicators. After the successful development of this ground anchor, it has been successfully used with good effectiveness in Xinchun Oil Production Plant of Shengli Oilfield.