1, and the maximum working pressure of tubing can reach 55 MPa. Well QJ 1 and well 10 are long horizontal wells for natural gas development. The horizontal well is constructed with connectors, connecting 405m tubing with equal inner diameter, tripping tubing for 8 times, and the maximum running depth is 5673.6m.. The reconstruction technology of this well adopts coiled tubing sand blasting perforation and casing large displacement injection fracturing.
2. The working pressure of tubing can reach 50 MPa, and the object is steel wire winding. Steel wire wound products are represented by SP medium-pressure hose types, such as DN 16 and 4SP, which represent inner diameter 16 mm and steel wire wound four-layer hose. Under the same pipe diameter, the steel wire winding process bears greater pressure and higher price than the steel wire weaving process.