| Popis: |
Artificial life method using the submersible plunger pump is a kind of lifting technique without sucker robs. The permanent magnet linear motor in the well which is connected with the submersible plunger pump by the supporting cable is the power source of whole system to drive the pump working. The supporting cable fixed on the outside of the pipeline runs down the well along with it. There is an energy-efficient technique, but have two drawbacks that need to be solved. The supporting cable lying outside the pipeline is prone to fiction with the casing. And the clamp installed in the middle of the pipeline is not firmly fixed, resulting in the problem of up and down movement, which increases the possibility of the supporting cable damage caused by friction. In order to improve the working efficiency, and reduce the probability of friction damage in the process of operation, the field tests try to place the casing inside the tubing. Drawing on the advantages of efficient coiled tubing operation, the power and signal cables are laid in the coiled tubing wall. The problem that the submersible supporting cables are easy to be worn during the process of workover is avoided. The well completion technology of preset cable coiled tubing has been developed successfully. Three kinds of preset cable are rested inside the pipeline. They are power cable, electric heating cable and signal transmission cables. The three cable system can provide power for the downhole permanent magnet linear motor and realize the functions of electric heating and submergence depth monitoring. 2 wells were tested in the field test. The experiment shows that this technique can meet the production demand of submersible plunger pump well. But during the test, one of the two wells experienced overloading shutdowns two times. However, after the electric heating function was activated for 2 h, normal production was resumed. The conclusions of the field test show that this technique could meet the demand of production. The field test provides a reference for the popularization and application of the preset cable coiled tubing completion technology. |
