3. CNPC made independent iterative innovation in high-end fully dissolvable bridge plug with leading performance
From July 8th to 12th, the fully dissolvable bridge plug developed by the CNPC Houston Technology Research Center and PetroChina Southwest Company was successfully tested in a well of Weiyuan Shale Gas Block. This indicates that the fully dissolvable bridge plug can work under 70 MPa pressure, with stable sealing performance and excellent solubility. The operator - GreatWall Drilling Company's Shale Gas Project Department gave it a high evaluation and believed that the overall performance of the bridge plug reached the world's leading level.
At the end of 2018, the Houston Center's fully dissolvable bridge plug passed the ground test in the PetroChina Southwest Company's Engineering Institute. The cartridge can achieve true total dissolution, exceeding the solubility of other soluble bridge plugs on the market.
In 2013, the Houston Center cooperated with Chuanqing Drilling, Xinjiang Oilfield, Tarim Oilfield, Southwest Oilfield and GreatWall Drilling to launch a series of bridge plug R&D. It has developed the first generation of bridge plugs represented by conventional high-speed bridge plugs, full composite bridge plugs, and ultra-short bridge plugs; the second-generation bridge plugs represented by fully dissolvable bridge plugs, and the third generation of advanced bridge plugs represented by ultra-short and large-diameter bridge plugs. （ECF News）
4. CNPC improves rotary steering drilling equipment utilization in Sichuan and Chongqing Shale Gas
As of July 4, the CNPC Oilfield Serrvice Company's shale gas rotary steering drilling maintenance support center has been officially put into use for more than half a year. The total footage of the high-slope rotary steering drilling equipment in the Sichuan-Yunnan region has reached 38,000 meters, with more than 30 well completed. The logging company technicians increased the monthly average utilization rate of maintenance equipment to 62%, up 44.19% year-on-year, and the monthly maintenance ratio was controlled within 30%. The indicators were better than the industry level.
Back in 2018, in order to ensure the high quality and efficiency of shale gas exploration and development work in the Sichuan-Yunnan region, the CNPC Oilfield Service Compnay shale gas rotary steering drilling maintenance support center was established and operated by its logging company.
According to the data at the time, even in China's major shale gas area of Sichuan Basin, the utilization rate of the rotary steering drilling equipment in the Sichuan-Yunnan region is still uneven at lowest of 7.6%.
After one year of development, in June 2019, the maintenance center shortened the maintenance period of rotary steering drilling equipment by improving efficiency, perfecting and improving the maintenance system, and improved the maintenance efficiency by more than 25%, and completed the maintenance of 29 series of equipment. The success rate is 100%.
On June 19, a shale gas well using the rotary steering drilling equipment was successfully drilled in the Changning block. The well was 5,950 meters deep, with 2,500 meters horizontal section and 21.2 days rotary steering drilling period. It has set a record of the deepest drilling depth, the longest horizontal section, the least drilling times and the shortest period under the same conditions in the 2019 Changning block. (ECF News)