4286 meters! China's shale gas ultra-long horizontal well drilling has made breakthroughs

On October 27, Sinopec released news that the Jiao Jin 18-S12HF well in the Fuling shale gas field of Sinopec Jianghan Oilfield was successfully completed, with a drilling depth of 7,161 meters, of which the horizontal section was 4,286 meters long and the horizontal section was 4,225 meters in one trip, setting two records for the longest horizontal section of shale gas wells and the longest "one drilling" advance in the horizontal section in one fell swoop, marking a major breakthrough in the drilling of ultra-long horizontal wells of shale gas in China, and will effectively drive the efficient development of shale gas
。

Shale gas is an unconventional gas reservoir, also known as an "artificial gas reservoir", which requires shale crushing to get the gas out, which is recognized by the industry as a world-class problem, and horizontal well technology is particularly critical
.
"Ultra-long horizontal well" refers to a horizontal well with a horizontal section length of more than 3,000 meters, which is difficult to achieve in mountain shale gas drilling due to many technical problems such as the difficulty of carrying rock cuttings, the complex force of drilling tools, and the high risk of collapse of the well wall, which has always been a difficulty in the efficient development of
shale gas in China.

As a national shale gas demonstration area, Fuling shale gas field has made every effort to tackle shale gas ultra-long horizontal well drilling technology
.
Through independent research and development of three-dimensional visualization and comprehensive geological guidance technology, Sinopec has successfully equipped the drill bit with "eyes", using the stored massive geological data to adjust the drill bit's trajectory at any time, so that the drill bit "accelerates in a straight line" and "drifts through the corner" in the underground palace, and travels through the high-quality reservoir like "pancake" at high speed like a "snake"
.
At present, Sinopec's horizontal well technology can drill more than 4 kilometers
in a directional direction within an error range of less than 5 meters.

At the same time, it has innovated and formed technologies such as key equipment and tools for ultra-long horizontal wells, friction reduction and drag reduction of ultra-long horizontal wells, and dynamic optimization of drilling parameters of ultra-long horizontal wells, realizing a major leap
from "unable to hit" to "playing fast and accurately".
At present, the average drilling cycle of Fuling shale gas has dropped from more than 90 days to more than 40 days, the shortest drilling cycle is only 25.
58 days, and the drilling rate of superior reservoirs has reached more than
96%.

Since the Fuling shale gas field was put into development and construction, it has innovated shale gas exploration and development theory, formed six core technologies, realized the efficient development of shallow gas reservoirs above 3500 meters, and the effective development of gas reservoirs of 3500 to 4000 meters, pioneered the three-dimensional development technology of shale gas in China, and the recovery rate of the three-dimensional development zone has reached the international advanced level
.
Up to now, the cumulative proven reserves are nearly 900 billion cubic meters, the cumulative production capacity is 15 billion cubic meters, and the cumulative output has exceeded 47 billion cubic meters, sending clean energy to more than 70 large and medium-sized cities in 6 provinces and 2 cities along the Yangtze River Economic Belt, benefiting thousands of enterprises and nearly 200 million residents
.