Design and Experimental Study of an RFID Intelligent Sliding Sleeve

In order to overcome the deficiencies of conventional horizontal well staged fracturing technologies, including complicated operations, the inability to achieve full drift size and limited number of fracturing stages, a horizontal well staged fracturing technology with an RFID intelligent sliding sleeve was proposed. The pipe string structure and technical challenges of RFID intelligent sliding sleeve fracturing technology were studied, on the basis of analyzing the characteristics of horizontal staged fracturing technologies and experiments carried out scheme optimization, simulation analysis, unit test and indoor prototype test for an RFID intelligent sliding sleeve structure. The test results showed that the RFID intelligent sliding sleeve could be smoothly opened to the preset openness under the temperature of 120 °C and pressure difference of 0–70 MPa. The RFID tag ball can control the window of RFID intelligent sliding to the preset openness, with RFID communication having an excellent success rate. The reesults indicated that RFID intelligent sliding sleeve-based horizontal well staged fracturing technology could reduce the cost of horizontal well fracturing, improve the efficiency of oil and gas development, and provide technical support for the intelligent, cost-saving and efficient development of oil and gas, with good foundation for future application.