Research On The Technology Of Real-time Monitoring And Selection Oil-production Of Downhole In Sub-sea Oil Fields

At present, Shengli offshore oil-field has enter high water cut stage, in which there are many problems such as contradiction between layers is very obvious, operation is very hard, cost is very high, and successful rate of test is very low, so the technology of real-time monitoring and selection oil-production of downhole is adopted to solve these problems. The thesis combines with production features of Shengli offshore oil-field, and on the basis of related research fruits in or abroad, we optimize capillary data acquisition and procession technique, compile correspondence software, and develop downhole sensor of capillary airbag. When using optical fiber test technique for monitoring of selection layers, in order to solve the problems of cable crossing and connecting, a high-intensity optical fiber is developed. Considering different production demands in wells, we design two kinds of downhole flow control devices which are hydraulic pressure control and electric control. In order to simplify operation technology, the hydraulic pressure and multi-channels controller is innovatively designed. By using some engineering mechanics theories, the technology of real-time monitoring and selection oil-production of downhole based on the lifting methods of electrical pump and screw pump is designed and experimented in Shengli oil field. The success of field experiment shows that the technology is safety, reliability, and good adaption. The technology can effectively reduce potential effect because of contraction between layers, and realize to control water-radio and enhance production. At the same time, the technology reduces the work of well operation and test and save a lot of operating and testing cost.