Three-dimensional development, ten years to build a shale gas China model

On the banks of the Wujiang River, drizzling rain
.

In the early summer of June, Jiaoling No.
12 well group, which has the largest number of wells in the Fuling shale gas field, was hidden in the mountains
.
From time to time, wisps of cooking smoke burst into the distance, and the green "squeezed vegetables" terraces and the yellow air-collecting trees complement each other, a beautiful and harmonious scene
.

"When many people see the word 'squeeze', their first reaction is to squeeze vegetables, and the first reaction of our gas field people is to 'eat dry and squeeze clean'
.
Our task is to 'eat and squeeze the resources available underground'
.
Zhang Weiquan, a gas producer on the platform, quipped while recording production data, "This well is a Jiaolian 12-Z1 well, which has just been put into production, which is another representative
of our three-layer three-dimensional development.
" ”

What is three-layer three-dimensional development? The reporter found the answer
in the technical center of Fuling Shale Gas Company in Jianghan Oilfield.

Shale gas, a symbol
of the energy revolution.
In November 2012, Sinopec achieved a major breakthrough in shale gas exploration at Fuling Jiaoshi Dam, which opened the prelude
to the commercial development of shale gas in China.
China has thus become the third country
in the world to achieve commercial development of shale gas.
However, in 2017, after three years of stable production in the Jiaoshiba block, production began to gradually decline
.

This is the most concentrated area, is there any possibility of further excavation? The petrified people began a new round of attack
.

"Previously, we treated the 89-meter-thick shale in the old area of Jiaoshiba as a set of gas layers, believing that by performing large-scale hydraulic fracturing on the lowest part of the highest quality, we could 'tear' open this huge rock layer at once, and the gas contained in the shale would continue to run up
through the cracks.
" Liu Li, director of the Natural Gas Development Institute of the Jianghan Oilfield Exploration and Development Research Institute, told reporters
.
However, after investigating foreign shale gas extraction technology and deploying layered development evaluation wells, the researchers realized that although the 89-meter-thick shale is the same lithology, the difference in longitudinal stress will inhibit the expansion height of artificial fractures to a certain extent, and there are also places where the cracks between the horizontal upper well and the well are not extended, and the local gas transformed by the artificial seam network can flow
, and there are still resources left where there is no transformation.

"It's like the first floor room mining, the first floor of the corridor and the second floor of the third floor have a lot of resources left there
.
" Liu Li said
.

As a result, the three-story three-dimensional development technology equivalent to changing the underground well network from "one floor" to "three floors" came into being, which effectively improved the oil recovery and utilization rate of
the gas field.
Up to now, Fuling Shale Gas Field has put into operation 263 upper and lower encrypted wells, and 6 upper and middle gas wells
.
With the blessing of new technologies, the new production capacity of Fuling shale gas field is 4.
81 billion cubic meters, and the oil recovery rate of the three-layer three-dimensional development zone is further improved, and the predicted recovery rate can reach up to 50%.

"Well factory" is another high-frequency word
that reporters heard in the interview.
The construction process of the three-story three-dimensional development adopts "well factory" drilling and fracturing to ensure that the process is efficient and fast
.

"The 'well factory' technology is a mode of operation in which a large number of similar wells are centrally arranged in the same area, and a large number of standardized equipment or services are used for drilling and completion, and fracturing, just like the assembly line factory, which is efficient and costly
.
" Lin Anguo of the drilling project department of Fuling Shale Gas Company said
.

At the beginning of the development of Fuling shale gas field, experts found that although North America already has the concept of "well factory", the reservoir burial depth and reservoir complexity of Fuling are very different from North America, and the exploration and development is more difficult, and it is not possible to simply copy the North American shale gas development model, and it is urgent to form a "well factory" technical system
suitable for the characteristics of shale gas in China.
It has become inevitable to take the road of "well factory with Chinese characteristics", and everything can only be crossed by feeling the stones
.

So, where are the "stones"? Fuling shale gas field starts from planning, together with the Petroleum Engineering Technology Research Institute, etc.
, to implement an integrated design of gas field geology and engineering
.
In the end, the mountain "well factory" technology formed by Sinopec research reached the leading level in China, rewriting the construction record again and again, creating a stunning "Fuling speed"
.

In March this year, the Jiaosha 12 expansion platform completed the largest "well factory" electric drive fracturing construction, setting 5 construction records, marking the world's leading level of all-electric drive fracturing technology in Fuling shale gas field
.
It also proves that Fuling shale gas field has always used scientific and technological innovation to promote the efficient development of shale gas in China, creating "Fuling sample" and "Chinese sample"
.

Innovate and form the theoretical understanding of "binary enrichment" of marine shale gas, shale gas exploration and development evaluation technology, long-horizontal well segmented fracturing test gas, green exploration and development supporting technical systems, establish more than 100 technical standards, and independently develop the first step-by-step high-power 3000-type fracturing unit and other large-scale equipment in China.
In the past ten years, Sinopec has dared to be the first again and again to create a strong core momentum
for the development of the shale gas industry.

At the end of 2021, the good news came again: the new report on the proved reserves of shale gas in the Baima Block passed the review of the Ministry of Natural Resources, and it was determined that the new proved reserves of the block were 104.
883 billion cubic meters
.
So far, the cumulative proven reserves of Fuling shale gas field are nearly 900 billion cubic meters, accounting for 34%
of the country's proven shale gas reserves.

The Baima block belongs to a typical atmospheric pressure deep gas reservoir, which has the characteristics of "double complexity" of
surface structure and underground structure.
After six years, the Fuling shale gas field has finally broken through the technical bottleneck of deep atmospheric shale gas benefit development, and the output of shale gas tested in a single well has increased from 40,000 to 60,000 cubic meters per day to 100,000 to 130,000 cubic meters
per day.

Today, walking on the platform of Jiaoping No.
155 in the Baima Block, the work site is hot
.
Xue Zhengchun, a technician at the gas production engineering management department of Fuling Shale Gas Company, told reporters that as of now, the maximum cumulative output of a single well in the Baima block of Fuling shale gas field is more than 30 million cubic meters, which is at a high level
in the domestic atmospheric pressure shale gas wells.
It is not difficult to imagine that soon it will be another scene of harmonious coexistence between "yellow" and "green", and a steady stream of green energy will start from here and light up the lights of thousands of homes
.

At the end of the interview, the reporter wrote down the slogan on the notebook: "Fight for the Chinese nation, compete for Sinopec, and strive for the Jianghan Oilfield.
"
This slogan is better than ten thousand words
.