China News Service, Urumqi, March 16 (Suhua Wang Weihua) As of March 14, the production data of the Keshen Gas Field of PetroChina Tarim Oilfield, my country’s first ultra-deep gas field located at the southern foot of the Tianshan Mountains, showed that the cumulative natural gas production exceeded 80 billion cubic meter.
The Keshen gas field is deeply buried, has high formation pressure, high temperature, steep structure, and tight reservoir matrix. It is a rare ultra-deep and ultra-high pressure fractured tight sandstone gas reservoir in the world.
Employees at the Keshen Processing Station are running in the desert and sticking to their posts.
Photo by Chen Bingbing
In 2008, Well Keshen 2 in the Keshen Zone of the Kelasu Structural Belt in Baicheng County, Xinjiang, tested and obtained high-yield industrial oil and gas flow, marking the success of the Tarim Oilfield's march into ultra-deep strata, breaking the "6,000-meter" limit for oil and gas at that time. The traditional understanding of "the line of death" has fully unveiled the mystery of the 7,000 meters underground in the Crassus structural belt.
In 2020, the Keshen Gas Field built my country's first ultra-deep clastic natural gas production base with an annual natural gas output of 10 billion cubic meters, opening up a new journey for the efficient development of Tarim's ultra-deep and high-pressure gas reservoirs.
Over the past decade or so, the Tarim Oilfield has faced exploration and development challenges head-on, intensified scientific and technological innovation, and continuously overcome a series of technical problems such as localization of oil nozzles, high-pressure water injection, sand and scale formation, etc., established ultra-high-pressure gas well integrity dynamic assessment and control technology, and successfully developed With the Keshen 9 gas reservoir, the deepest gas reservoir on land in my country, and the Keshen 13 gas reservoir, the highest pressure gas reservoir in my country, the Keshen gas field has become the “main force” in increasing natural gas production in the Tarim Oilfield.
In recent years, the Keshen Gas Field has experienced high production while facing serious problems such as water intrusion.
The Kela Oil and Gas Management Area of the Tarim Oilfield continues to promote the integration of geology, engineering, and ground, and works together to continuously improve the supporting technologies for gas field development and production and build a solid foundation for safe production in the gas field.
Tarim Oilfield researchers continue to focus on the comprehensive management of old oil and gas fields. By deepening the study of the coupling relationship between faults, fractures, sand, and partitions, they carry out big data analysis and integration research on old well logging interpretation, oil testing, etc., forming a "roof skylight." Three important understandings: "Water flooding in one well does not mean water flooding in all layers, and not all water wells are afraid of unblocking" and "traditional low resistance means that the water layer is not necessarily water", which strongly supports the success of tapping the potential of three old wells in the Keshen gas field.
In the cold winter, the Keshen processing station continuously delivers high-quality natural gas to the downstream of the West-East Gas Pipeline.
Photo by Chen Bingbing
Tarim Oilfield geological researchers strictly implement the "one well, one policy" system, fully understand the "past and present" of a single well, and explore and reserve second-generation technology reserves such as single well water blocking, gas injection, water blocking, and water lock release, forming a "control, drainage, and "Tune and block" combination boxing.
At present, the Kela Oil and Gas Management Area of Tarim Oilfield has firm confidence, continuously strengthens fine geological research, orderly and effectively promotes the sustained and stable production of 10 billion cubic meters of Keshen Gas Field, and goes all out to ensure the safe and stable gas supply of the west-to-east gas pipeline network.
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