Through the "treasure hunting path" leading to the deep earth, Tarim oilfield has found a large ultra-deep reservoir in China

In mid-july, coming tarim oilfield (hereinafter referred to as the oilfield) good news: in the first half of the oil gas exploration with fruitful results, the main reservoir generally rich full 8000 meters depth of the oilfield, find our country large abyssal facies fault control seam hole type carbonate reservoir, the newly discovered a 10 YiDunJi area scale of oil reserves, for added new oil fields to the deep, deep into kinetic energy.

Fuman oilfield is the deepest larger volatile carbonate reservoir discovered so far in the world, its exploitation difficulty ranks the forefront in the world. After six years of research, the oilfield has overcome the problems of high-quality seismic data acquisition processing technology well layout technology in ultra-deep complex carbonate rocks, which has raised the success rate of new Wells 75% to more than 95%.

Fuman oil field is one of the "hard bones" that the oil field has achieved by relying on the key technology group of ultra-deep oil gas exploration development. "Much starker choices- graver consequences-in" during the period of oil field won the first prize in seven provincial scientific research project, key technology group of deep oil gas exploration development "run" to "" run, then to "lead" across, vigorously promote led toward the deep area of oil industry in China, led to our country deeply field development progress of technology, equipment industry.

Enter the ultra-deep layer, shouldering the responsibility of Tarim

For a long time, China's energy supply has been in a tight state, oil gas external dependence has exceeded the international warning line, the energy security problem seriously restricted China's economic social development.

With the deepening of exploration development, shallow reservoirs in Tarim Basin have been almost exhausted. The results of the new round of oil gas resource evaluation show that the ultra-deep oil gas resources in Tarim Basin are rich. The oil gas resources buried over 6000 meters account for 83.2% 63.9% of the national total, respectively. The total amount of ultra-deep oil gas resources accounts for about 19% of the world, the exploration development potential is huge.

After a thorough study of the internal external development situation, the oilfield clearly realized that to find a strategic replacement field achieve high-quality development, it must base itself on the big picture of the big basin, jump out of the "white picket fence", improve its ability to control resources, "have grain in hand don't panic in mind".

Dare to be the first to break the confinement of traditional engineering geology

The Tarim Basin has experienced eight tectonic deformations of "overall compression, stratification deformation, vertical superposition linkage progression", the geological structure is extremely complex. Of the 13 measures of drilling difficulty in the world, none of the tower's seven measures ranked first.

Faced with the problem of "rare in the world but unique in China", the oilfield constantly deepens the understanding of geological theory, reconsiders the underground, reconsiders the "home bottom", sets up nine basic research topics such as structure, deposition accumulation, draws the outline of the "treasure hunting path" leading to the deep earth.

Focusing on the technical bottlenecks of ultra-deep drilling, the oilfield formulated an engineering technology implementation plan of "six optimizations six enhancements" to tackle three key technical bottlenecks, namely, fast drilling in complex difficult formations, wellbore integrity in extreme environments, safe isolation of complex pressure systems in deep, to sharen the "diamond" of ultra-deep drilling.

Face up to the challenge break through the three key issues

Faced with the three key problems of oil gas accumulation, engineering technology efficient exploration, the oilfield has innovatively developed two key ultra-deep oil gas geological theories, four series of exploration development technologies six supporting technologies for engineering projects, creating three "sharp swords" to improve seismic quality, drilling speed development production.

"wide line + large combination" 2D seismic to 3D seismic, "B ultrasound" to "CT examination", the oilfield has continued to strengthen the deployment of geophysical exploration solve key problems, spread a "big net" in the Tarim Basin, brighten the "eyes" of geologists, the percentage of the first second grade seismic data supporting the Kuqa piedown seismic data has increased 50% to 83%.

In recent years, the oilfield has continued to deepen the geological understanding, clearly constructed the basin stratigraphic structural framework in new areas new areas, identified three hydrocarbon generation centers, established the main exploration direction.

In front of the Kuqa Mountain, researchers clearly understand the rules of the subsalt structure in rows belts, realize that there must be a "circle" a "reservoir". In the platform basin area, the strike-slip fault-controlled reservoir-control law of carbonate rocks was clearly grasped, a large oil field was found in a small oil pool, which broke through the "death limit" of hydrocarbon accumulation.

Seize the drilling the "leading" project, oil field casting engineering technology "weapon", form a complete set of integrated ultra deep well drilling technology, "tailored" optimization of well bore structure, perfecting the complex lithology formation speed template, kuqa piedmont of each well drilling cycle is shortened 600 days to 289 days, the basin area of each well drilling period 200 to 131 days, Deep drilling completion has achieved a significant leap " capable of drilling" to "drilling well, drilling fast building well".

Focus on "difficult to use" reserves, oil field supporting form deep complex reservoir precise reconstruction technique, application net pressure acid fracturing technology, make the reservoir "rich", single well oil gas production is rising, the implementation of reservoir after modification, the average single well open-flow capacity increased by more than five times, 10 times the average single well production over the eastern fields.

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Source: China Energy Network