Horizontal Well Downhole Flow Control Valve Design

Intelligent completion technology represents the development direction of modern completion technology. This thesis mainly aimed at the problem of water cone and gas cone leading to low recovery because of uneven distribution of pressure for horizontal wells in the oil production. The main objective of the study is to install a short section of valve which can control oil pressure and flow rate in horizontal wells in oil production segment, thus the reservoir pressure and velocity profiles can be balanced, and then, the time of water coning and gas cone can be delayed as far as possible, and the recovery ratio can be increased. The main study content and fruit is listed as follows:1. This paper made a brief investigation of completion and oil recovery technology at home and abroad, particularly the completion of horizontal wells, oil production of the technology, pointed out the defect of the existing horizontal well completion technology, and then proposed the speculation on and idea of the development for the future;2. The pressure loss when liquid flowing was studied by the theory of fluid dynamic analysis knowledge, especially the pressure loss in circular tube;3. Based on the existing operating principle and design idea of the flow control valve abroad, and by combining with the domestic well completion technology level, this paper proposed three design programs, and designed this three structure model. Through calculating the pressure loss by theoretical formula, the best plan of design-the spiraled fluid control valve was determined after considering all kinds of factors such as economy, environmental protection, anti-corrosion, and anti-clogging, integrated fluid control valve;4. The three-dimensional structure diagram of the control valve was drawn by Pro/E software, and the method of how to remove the control valve was simply explained. Then with ANSYS, this paper drew the fluid region, did mesh generation and simulated downhole reservoir, and obtained the pressure loss and velocity deference between import and export;5. After analyzing the performance and reliability, the designed structure was optimized, and then this paper improved an optimized structural model, which has better performance, structure, and economy, thus achieved the goal of innovative design.By horizontal wells downhole flow control valve design, this thesis has made great achievement in structural optimization and improvement. The experimental value is closer to the theoretical value, which gives ideal instruction for the field application guidance.