China Petroleum Network News (Correspondent Dai Shilei and Wang Nan) On June 25, the author learned that the horizontal section of the side drilling of the Su 10-51-X well undertaken by Great Wall Drilling is 1,217 meters long, breaking the record for the longest horizontal section of the side drilling of the ultra-small well diameter of 118 mm in the Sulige area.
In recent years, Great Wall Drilling has vigorously implemented 118mm ultra-small diameter side-drilling horizontal wells, used window opening in old wells and horizontal well side-drilling technology to increase reservoir drilling length and improve single-well oil recovery efficiency in order to meet the severe challenges of deteriorating resource quality and declining single-well production in the exploration and development of Surigu tight gas.
Great Wall Drilling coordinated multiple resources such as drilling, geology, logging, and technical services, giving full play to the advantages of geological engineering integration. During the construction, the controlled pressure drilling, micro-hole expansion, and wellhead anti-wear technologies were applied to effectively overcome the technical difficulties such as high pressure loss of the drilling annulus, difficulty in entraining sand and rock, and easy leakage and collapse in the well. The high-precision three-dimensional reservoir characterization technology based on sedimentary cycle analysis and single sand body configuration was used to successfully solve the problem of drilling mudstone interlayers caused by the rapid three-dimensional changes of the river channel, and improve the accuracy of the geological three-dimensional model. During the drilling process, an expert technical team was formed to track and guide in real time, and the trajectory was adjusted in time twice, successfully avoiding two mudstone interlayers. In the end, the horizontal section of the completed drilling was 1,217 meters long, exceeding the designed horizontal well section by 117 meters, and the sandstone drilling rate was 100%, laying a solid foundation for the efficient development of low-grade oil and gas resources in the Sulige area.