Ultra-long Shale Block Development Significantly Accelerated by Anton Hi-performance and Environmental Water-base Drilling Fluid
The borehole instability is still a major challenge for developing those blocks containing ultra-long shale sections around the world that seriously hampers the development rate.
When drilling in an ultra-long water-sensitive shale interval, a conventional Saltwater-based-mud system cannot provide enough inhibition and anti-caving ability to prevent borehole instability. These often result in balling, caving, sticking during tripping and logging, which hinder the development rate of oil and gas exploration and development. Meanwhile, the supervision of various countries and regions is becoming more and more strict on the environmental pollution caused by oil exploitation, so the environmental performance requirements of the drilling fluid are also becoming higher and higher.
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Anton Hi-performance Environmental Water-base Drilling Fluid
High Efficiency & Environmental-friendly Performance
To reduce the downhole complexity, ensure safe and faster penetration, as well as reduce the total cost of drilling, Anton Oilfield Services (Group) Ltd. has successfully researched and developed a
Hi-performance and Environmental Water-base Drilling Fluid. This system has an extraordinary inhibition and sealing performance for ultra-long mud and shale formation intervals, and at the same time, it is also an environmental-friendly and economical characteristic.
Anton Hi-performance and Environmental system has applied in 68 wells in the typical ultra-long shale formation block since 2019, and we created several records in those blocks such as successfully completing the deepest well, the longest shale interval in the main section (3,500 meters of pure shale), and lowest drilling fluid spending, etc. Anton Hi-performance and Environmental System has achieved outstanding application effects and has been praised highly by operators.
Anton Hi-performance and Environmental system has applied in 68 wells in the typical ultra-long shale formation block since 2019, and we created several records in those blocks such as successfully completed the deepest well, the longest shale interval in the main section (3,500 meters of pure shale), and lowest drilling fluid spending, etc. Anton Hi-performance and Environmental System has achieved outstanding application effects and has been praised highly by operators.
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Advantages of Anton Hi-performance and Environmental System：
·Simple formula, strong anti-pollution, compatibility, easy for mixing and maintenance.
·High rheology enhances the
performance in borehole cleaning and reduces requirements for pumping and circulation equipment.
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Outstanding inhibition and plugging ability effectively prevent the borehole instability of ultra-long shale intervals.
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Excellent reservoir protection ability because of low solid content, low MBT, and strong plugging characteristics.
·High lubrication and low filtration performance, applicable for various well types.
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Non-toxic, odorless, and environmental-friendly, excellent economic performance.
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Mechanisms of Anton Hi-performance and Environmental Drilling Fluid System
Anton Hi-performance and Environmental Water-base Drilling Fluid System has the quadruple anti-caving capacity, which takes HMP, high efficient mud shale inhibitor, potassium formate, nano plugging agent and non-fluorescent anti-caving agent as core treating agents.
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Evaluation of Anton Hi-performance and Environmental Water-base Drilling Fluid System
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Compared with drilling water, the shale cuttings recovery ratio increase by 110%, and the polar expansion ratio reduce by 86%.
The Technical Challenge of Borehole Instability in Ultra-long Shale has been Successfully Overcome by Anton Hi-performance and Environmental System.
Anton Hi-performance and Environmental Water-base Drilling fluid System has a strong inhibition performance. It can not only prevent the ultra-long mud shale formation from caving, but also be safe and environmental-friendly, meeting the demand of cleaning drilling.
The returning cuttings are complete and highly representative through drilled by Anton Hi-performance and Environmental system.
Anton Hi-performance and Environmental System is characterized by high rheology, convenient maintenance, and excellent
cleaning capacity, so which can more batter meet the needs of faster drilling.
The third section length of V-1 well was 1,653 meters, applicate Anton Hi-performance and Environmental System, the average well caliper was 8.65in, and the average well caliper expansion ratio was 1.76%.
In the practical drilling process, Anton Hi-performance and Environmental System showed strong inhibition for the ultra-long shale. Therefore, all of the tripping are smooth and wireline logging successfully carried out in one time, and greatly reduce the drilling cycle. Compared with the designed time efficiency, the completion date is ahead 12 days, reducing 25% in terms of the rate.
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Comparison of Actual Drilling between Anton Hi-performance and Environmental System and Conventional Salt-water System
Anton Hi-performance and Environmental System greatly improves the one-time success ratio of wireline logging from the comparison between Conventional Salt-water Drilling Fluid B-16 well group platform and Anton Hi-performance and Environmental System B-21 & B-17 well group platform.
Anton Hi-performance and Environmental Water-base drilling fluid System can provide better borehole stability in lower system density.
Anton Hi-performance and Environmental Water-base drilling fluid System is more stable, can be better and more often reused, so it can offer more substantial economic utility.
