Multi-disciplinary “sweet spot” evaluation and
prediction technology | By integrating with geology, seismic, well logging, engineering and other multi-disciplinary research
methods, optimizing different types of “reservoir sweet spots” on plane, vertical and horizontal
sections, with encountering rate of high-quality reservoir of over 80% |
Horizontal well, small
well spacing, large well
cluster well deployment
technology | Based on the characteristics of intra-source oil accumulation, integrating field practice, single well
investment, technical and economic factors, the reasonable horizontal section length (1500-2000 m)
is optimized to improve the effective utilization level of the reservoirs |
Combining the downhole micro-seismic, physical modelling, inter-well interference, etc., the reasonable
spacing of horizontal wells (300-400 m) is determined to ensure that the zones between wells are
fully covered by the fracture network and increase the rate of oil production |
A three-dimensional well layout pattern with large cluster is formed. The number of wells on a single platform
has been expanded from 1-2 to 4-8, and the maximum number of wells is greater than 20, which realizes all
utilization of multiple small layers in the vertical direction and improves the degree of reserves control |
Optimal and rapid drilling and
completion technology for
cluster 3D horizontal wells | Overall platform optimization, three-dimensional profile design, actual drilling trajectory control,
perfect friction and drag reduction technology, to achieve optimal and fast drilling and completion |
Subdivision cutting volume fracturing technology to
increase single-well
production | With the goal of “maximizing fracture-controlled reserves”, the fracturing design concept has evolved from
“shattering reservoirs with large displacement” to “fine cutting and shredding reservoirs”. The subdivision
cutting volume fracturing technology for long horizontal wells has become an effective core weapon
for quality improvement and efficiency increase |
Experiments were carried out in the Changqing and Xinjiang oilfields, by adopting the “batch fracturing and
batch production” model, and initial results have been achieved in the development of large-scale efficiency |
The capabilities of reservoir reconstruction technology have improved, and fracturing technical indicators rise
year by year. From 2016 to 2019, the number of reconstructed horizontal wells was 780, the average number
of fracturing stages increased from 9.8 to 18.9, and the average single well sanding and fluid volume
increased by 4.1 and 3.1 times, respectively |
Platform-based and
factory-based operation
technology | By adopting the management model of “small platform factories, large regional factories”,
share production resources, and streamline operations to increase speed and efficiency |
Through the advanced guarantee of “water, road, electricity, communication” and the three-way design of
drilling, testing and producing, the drilling cycle was reduced from 29.1 days to 18.0 days, and the
fracturing efficiency increased from 1.2 sections/day to 3.1 sections/day, gradually realizing
upgraded factory model of “platform → region → organization” |
| Surface supporting technology for digital and intelligent oil production | Strengthen the information collection and application of intelligent management technology in various links
such as oil production, surface, operation and management, and build a new labor organization structure of
“central station-smart well” through “primary station deployment, skid-mounted station construction,
and intelligent management and control” |