Application of Remote Monitoring and Controlling Intelligent Separated Layer Water Injection Technology in BQ Oilfield, Dagang

Abstract The oil layers in Dagang Banqiao Oilfield are deeply buried, have many layers, and have large differences in water absorption between layers. The existing bridge-type concentric injection technology to control water distribution requires well test trucks and personnel to arrive at the well site to perform cable hoisting and instrument operations. Obtaining the injection parameters is short-term, and long-term monitoring cannot be achieved. During the operation, problems such as instrument obstruction and jamming often occur, resulting in a low operation success rate and difficulty in meeting the needs of the oil field for injection, control and water distribution. To solve the above problems, remote monitoring and remote control intelligent injection technology were proposed. This technology consists of a host computer client, a data center server, a monitoring remote control and a digital water distributor. The connection between the client and the data center server relies on the internal network of the oil field, and the remote wireless communication between the data center server and the monitoring remote control is carried out through VPDN. The monitoring remote control is installed on the injection wellhead water injection pipeline and consists of a pressure gauge, flow meter, chip, electronic control valve, communication module, etc. The digital water distributor integrates modules such as batteries, motors, chips, pressure sensors, and adjustable water nozzles, one for each water injection layer. Wave code wireless communication is used between the monitoring remote control and the digital water distributor. Wave code wireless communication uses injected water as the carrier. By changing the opening of the ground electronic control valve or the water nozzle of the digital water distributor in a short time, it establishes the water injection pressure fluctuation signal in the oil pipe. After coding and decoding processing, it realizes monitoring of remote control and digital water distribution. Two-way communication between controllers, that is, the monitoring remote controller sends control instructions to the digital water distributor, the monitoring remote controller receives instructions or the digital water distributor executes control instructions, and sends the collected dispensing parameter data to the monitoring remote controller. Up to now, 36 wells have been applied on site, with a success rate of 100%, maximum well depth: 3827m, maximum oil layer temperature: 120°, and maximum validity period: 1482 days. This technology is not affected by well site environment, weather changes, time and other factors, and has significant advantages such as high measurement and adjustment efficiency, high measurement and adjustment success rate, and low management cost. The dispensing parameters can be monitored remotely from the PC client in the office for a long time, and the digital water distributor can be remotely controlled to inject water or inspect the seal according to the water distribution requirements. This technology is simple and convenient to operate, and can provide experience and reference for the development of layered water injection in domestic and foreign oil fields.