Bohai Drilling Excellent Drilling Technology
“The application of excellent drilling technology in the Su 75-60-30X well is 34.24% higher than the average mechanical drilling rate of the same type of well in the block.†On August 13, Liu Chao, deputy chief engineer of Bohai Drilling and Drilling Company, said excitedly. This is another result of the drilling company's vigorous implementation of excellent drilling technology in Sulige this year.
As the country's demand for natural gas is growing, the company's Changqing market drilling team has gradually increased from 10 to 19. Faced with a wide range of construction areas, there are technical problems such as the loss of mudstone in the Shuangshi Formation, the loss of the Liujiagou Formation, the poor drillability of the Liujiagou and Shiqianfeng Formations, and the difficulty in preventing leakage and leakage of the regional leakage layer. Drilling technology research efforts, actively take the road of technology speeding up and increasing efficiency.
Combined with the characteristics of the various blocks in the Sulige gas field, the company has specially established the “Sulige gas well excellent drilling technology research†project, comprehensively collecting geological data of various blocks in the gas field, analyzing and studying the lithology characteristics of the stratum, the variation law of formation pressure, and summarizing the construction area. High-index wells and accidents in complex wells, find out the bottlenecks that constrain the speed-up, actively cooperate with the fraternal units, carry out technical research, and strengthen technical exchanges and research and development cooperation.
In recent years, it has carried out research on trajectory control technology, PDC bit personalization optimization, leak-proof and plugging technology in 40 wells, and personalized design of drill bit from the prevention of bit mud pack and improving the anti-abrasiveness of drill bit. The drilling fluid system optimizes the performance of the drilling fluid and improves the regional leakage prevention and sealing scheme. In the Liujiagou and Shiqianfeng formations with poor drillability, new tools such as torsion impactors, hydraulic oscillators, and wellbore cleaners are tried to improve the sliding or compound drilling speed and extend the life of the drill.
Through on-site trials and continuous improvement of technical measures, Drilling Company has gradually formed a cluster well trajectory optimization and control technology, a drill bit sequence template, drilling fluid system and other drilling fluid systems, and designed a simple drilling cycle. New practical tools such as plugging and sealing have effectively solved the serious problems of sandstone layer wear on the drill bit, collapse of the Shuangshi Formation, collapse of large displacement wells and horizontal wells, and continuous drilling, which effectively improved the drilling speed.
At the same time, speed up the transformation and application of scientific and technological achievements, and widely promote superior drilling technology in various blocks, and see obvious results. In the Changqing gas field block, the average monthly rig speed of conventional wells increased by 39.21% year-on-year; in the Su 25, 20, 76, 75 and other blocks, the average monthly rig speed of conventional wells increased by 8.55%, 8.41%, 10.08%, 7.58, respectively. %. Among them, Su 75-74-19 well refreshed the block with the highest drilling rate and the shortest drilling cycle of similar wells in the block.
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