Breakthrough in drilling technology innovation in Tarim Oilfield

This year, the drilling engineering technology initiatives in the Tarim Oilfield have been aligned with the company's strategic goals of addressing key challenges, solving practical issues, and enhancing the relevance, timeliness, and effectiveness of technological breakthroughs to support improved drilling speed and efficiency. Continued innovation has led to significant progress, with multiple technological advancements providing strong technical backing for faster and more efficient drilling operations. As of now, the total footage drilled this year has increased by nearly 10,000 meters compared to the same period last year, while the average drilling cycle has decreased by 9 days, and overall well aging time has also dropped. These achievements are a direct result of numerous innovations in drilling engineering technologies. Vertical drilling technology has matured significantly this year, becoming a more reliable and efficient method. It has been widely implemented in the upper sections of mountain front wells in areas like Dabei, Dina, and Yangbei, helping to overcome previous challenges of high cost and low efficiency. This advancement has opened new pathways to prevent casing damage and improve the drilling speed of these complex wells. This year, the average drilling cycle for mountain front wells was reduced by 19.78 days, a decrease of 8.22%, while the daily rig speed increased by 107.64 meters, or 21.32%. For instance, the Dina 2-8 well reached 5,036 meters in just 117 days, saving 72 days compared to the planned schedule. It became the fastest well in the Dina block to reach 5,000 meters, and the Dina 2-5 well in the Bidina block was completed 35 days faster than expected. One of the most notable achievements this year was the successful development of the "light mud" drilling technology. Following its initial success in the Yangta 1-7 well, the technology was further tested in the Yangta 3 well, where it delivered impressive results. The Yangta 3 well, a pre-exploration well located in the Yangtaike area, was drilled using light mud up to the 4,009-meter section. Throughout the test, the wellbore remained stable, with no signs of collapse. The entire section saved 43 days compared to the original schedule, setting a new record for the highest mechanical drilling rate in the Yangtai block. This success highlights the promising potential of the "light mud" technology for future applications. In addition, the oilfield company significantly increased its investment in engineering research this year, allocating over 50 million yuan annually for drilling-related studies. This financial support has played a crucial role in accelerating technological development and testing. During April, pressure-controlled drilling was successfully conducted in three wells: Tazhong 722, Middle 2, and Lunan 633. In July, to address the issue of extreme sensitivity in the third layer under the Dina 2 block and serious drilling fluid loss, a drilling-drilling technology test was carried out in the Dina 2-4 well, focusing on the narrow pressure window of the target formation. Initial positive results were achieved. In August, the Dabei 3 well was deepened three times to drill a sidetrack, successfully completing complex operations in deep multi-layer salt formations. This included ultra-deep well sidetracking, the application of ultra-high-density and high-temperature mud systems, and drilling under ultra-high-pressure conditions. All these efforts marked major milestones in the field of deep drilling engineering.

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