Tractor perforation technology solves the perforation problem in the first section of complex wells

Recently, Jianghan Logging and Logging Branch adopted the self-developed and domestically original tractor perforation technology to successfully complete the first section of the Fujiao Ye 149-4HF well
.

The tractor perforation technology revolutionaryly combines the tractor transmission process with the multi-stage perforation process.
Compared with the traditional coiled tubing transmission perforation method, it has high time efficiency, accurate accuracy, low safety risk, low cost, and operable It can solve problems such as failure to open the toe end sliding sleeve of an ultra-long upturned horizontal well and self-locking of coiled tubing.
It can smoothly push the perforating tool string to the perforation section, and it can also handle the pumping multi-stage perforation construction.
Complex situation
.
This technology has been successfully applied 297 well times in markets such as Fuling Shale Gas Field, East China Bureau, Northeast Bureau and other markets, setting a number of construction records including the largest tractor perforation deviation and the most tractor perforation clusters (5 clusters).

Well Jiaoye 149-4HF is a shale gas evaluation horizontal well deployed by Fuling Shale Gas Company in Wulong, Chongqing.
The well is 4910 meters deep and the horizontal section is 1830 meters long.
106°
.
Due to complex wellbore trajectories and poor wellbore conditions, this well has become the most difficult well in the history of the Fuling area.

Jianghan Logging Branch faced the difficulties.
After receiving the task, it immediately carried out preparatory work and carefully analyzed the three difficulties in the construction of the Jiaoye 149-4HF well: First, the transmission of power must overcome the strong resistance of cables and instrument strings; The second is that there is a safety hazard in the process of traction and perforation that the instrument string slides down; the third is that foreign matter such as sludge and iron filings in the well may cause dragging resistance
.

In response to the above difficulties, the company applies modular high-power tractors, high-torque reducer drive sections and power output combinations to meet the needs of transmission power; adopts tractor perforation technology, and innovatively designed brake sub-braking and traction Technological methods such as the dynamic braking of the device itself, to solve the problem of the sliding of the instrument string in the upturned well perforation impact; the design of the tractor hydraulic push against the energy storage balance device to timely adapt to the complex environment such as the shaft diameter change and foreign objects, and enhance the ability to overcome obstacles Ability
.
After 24 hours of continuous operation, the tractor successfully reached the perforation level with the perforating gun string, completed the perforation ignition accurately, and completed the construction safely and with high quality

The successful completion of the first section of the perforation construction of the Jiaoye 149-4HF well, once again demonstrated the leading advantage of the tractor perforation technology of Jianghan Logging Branch in the industry, and further expanded the market space for the company and helped the domestic shale gas efficiency Low-cost development provides strong support

(Fei Tingting Guo Ruisheng)