30 gas wells in the Fuling Gas Field achieve "one trip drilling" in the horizontal section

Sinopec News Network reported this year, a total of 30 gas wells in the Fuling shale gas field in Jianghan Oilfield have achieved "one-trip drilling" in the horizontal section, an increase of 40.
6% year-on-year; the penetration rate of high-quality layers is 99.
08%, an increase of 3.
2% year-on-year
.

The horizontal section "one-trip drilling" technology means that in the drilling of the three-open long horizontal section of a gas well, only one drill bit and one screw are used to drill all the footages of the three-open long horizontal section at one time
.

Since the beginning of this year, with the deepening of the three-dimensional development and adjustment of the old area of ​​the Fuling shale gas field, and the active development of new blocks such as Baima and Fuxing, the stratigraphic conditions have become more and more complex, with large undulations, and there are serious leakages, earthquakes, and wellbore trajectories.
Drilling risks such as bumping and triple-opening "mud-pack bits"
.

"The wellbore trajectory is complex and changeable.
If you want to achieve a horizontal section of'one trip drilling', in addition to'pierce the needle and lead' in the formation, you need to penetrate the Yangtze in a hundred steps and accurately hit the target
.

In accordance with the work requirements of "Four Improvements and Five Modernizations", Fuling Shale Gas Company focused on the speed and efficiency of drilling construction, strengthened the integration of engineering geology, strengthened the field application of new technologies and new tools, and continuously optimized the "one trip drilling" of long horizontal sections.
Drilling technology improves the penetration rate of high-quality reservoirs
.

　　The company cooperated with scientific research and construction units to promote the integration of geology and engineering.
The technical staff formed a geo-steering research team.
According to the principle of "one well, one policy, one section, one policy", starting from the geological foundation, technological measures, etc.
, carefully study the area Block structural changes, gas reservoir conditions and logging data from adjacent wells, establish stratum models, simulate stratum response, predict drilling encounter stratum, deeply sum up geological engineering integration construction experience, and jointly optimize geological schemes and drilling construction schemes.
High-quality drilling construction lays a good foundation
.

　　During the drilling process, the company introduced new tools such as rotary steering, near-bit, hydraulic oscillator, etc.
, optimized high-temperature resistant oil-based screw, PDC bit, hybrid bit and other drilling tool combinations, and used 3D geosteering, anti-collision analysis and other software to be flexible Using the "macro control, node control" steering technology, continuously according to well depth, well deviation, formation dip angle change, gamma curve while drilling, logging lithology, gas logging display changes and other parameters, accurately control the drilling process, timely monitoring, Adjust the well trajectory to effectively solve the technical problems in the horizontal well construction, such as insufficient deflection capacity, serious directional pressure, and frequent trips
.

　　The Jiaoye 106-5HF well is a key well in the Baima block.
The horizontal section is 1689 meters long.
There are difficulties such as large changes in the thickness of the formation and possible changes in the target point.
To ensure a stable wellbore trajectory, the well finally realized the "one-trip drilling" of the three-open horizontal section, with an average ROP of 11.
91 meters per hour, setting the record for the highest average ROP in the Baima block
.

　　Well Jiaoye 11-Z1HF is a central gas well in the gas field.
It is located in the "downtown" of the three-dimensional development and adjustment of the old gas field.
There are many neighboring wells.
The horizontal section is 2,142 meters long.
The risk of collision prevention is high.
Anti-collision technology, wear a "binoculars" to the drill bit, so that the underground situation can be "see"
.