In order to solve the problems of long perforation cycle

high cost and self-locking of long horizontal section of coiled tubing transmission

a key test for tractor perforation has been carried out. At present

the staged fracturing of horizontal shale gas wells mainly uses pumping bridge plug perforation. In the first part of the frac well

because of the lack of pumping channels

coiled tubing transmission perforation is used usually

which need longer operating cycle and higher cost

and is not beneficial to reduce cost and improve efficiency. Nanchuan Shale Gas Field has expanded the business scope of the roller tractor by introducing and improving some tools

and realized the tractor perforation of shale gas horizontal wells. The tractor perforation powered by a tractor transports the perforation gun to the position and ignites the gun. By on-site improvement and testing

Nanchuan Shale Gas Field has solved the problems of voltage isolation protection joints

shock absorption joints and adapters

mastered the performance of tractor perforation and applicable conditions

and provided experience for subsequent construction and basis. The test results show that the perforation of the tractor in the horizontal section of shale gas wells with a well deviation of less than 90° is reliable and feasible. The tractor perforation can meet the needs of shale gas horizontal wells under pressure perforating operation. Its operation process is greatly affected by well deviation and wellbore cleanliness. Compared with coiled tubing perforation

its speed-up and cost-reducing effect is obvious. The construction period can be saved by two days

up to 50 %.