The Integration of Checking Seal and Testing Regulation of Bridge Concentric Layered Water Injection Technology Research and Application

Fine-layered water injection is the most economical and effective technical means to keep the formation of energy and improve water driving use in low permeability reservoirs. Changqing oil field adopts directional well and small water flow-rate development, and the problem of short duration of injection pipe column, low success rate of test, and low efficiency restrict the efficient development of low permeability reservoir. With the advancement of low permeability oil field water injection work, focusing on the demand of the oil field development efficiency, this paper puts forward the integration technology of bridge concentric layered water injection, which keeps the water distributor and adjustable water nozzle concentric integrated design, breaks through the original test, inspection seal traditional process step by step, innovative research and development of the second-generation bridge concentric layered water injection key tool, and forms on testing the integration process, with a process to finish each layer checking seal and testing and regulation, so it improves test mixing efficiency significantly by all the advantages. In Nanliang experimental zone water injection development, the field application of bridge concentric layered water injection technology is 65 wells and enlarges the comprehensive application covering Changqing oil field in 2018. Meanwhile, the success rate of measured is 95%, and the average checking seal and testing time of single well are 4–6 h. Bridge concentric layered water injection technology for highly inclined wells significantly improves the success rate and efficiency of the injection well test, saving single well’s operation time more than 30% and cost over 20%, and enhances water driving use degree by 10.7%. The successful application of this technology has enriched and improved the technology system of layered water injection technology, which has realized the upgrading of the fine-layered waterflooding technology and has a wide application prospect.