Research and application of critical injection tool for offshore heavy oil thermal recovery wells
With the large-scale development of offshore heavy oil thermal recovery,there are generally problems such as uneven gas absorption and poor utilization of reservoirs in highly inclined horizontal wells.The critical injection tool can achieve steam constant flow injection under certain applicable conditions,effectively solving the problem of uneven utilization of horizontal reservoirs.Through the study of critical injection mechanism and simulation analysis,the physical property conditions and geometric size requirements of critical flow were revealed;We have developed a critical injection tool with a series of Laval nozzle structure designs.Indoor tests have verified that it has a constant current steam injection function,with an overall temperature resistance of 350℃and a pressure resistance of 21MPa.The constant current test error is less than 2%;on site tests have shown that the critical injection tool is structurally reliable under high temperature conditions,with a uniform steam injection profile in the horizontal section,effectively improving the quality of steam injection.It is suitable for promotion and use in balanced steam injection in offshore heavy oil thermal recovery wells.
Critical injectionHeavy oil thermal recoveryUneven suction of steamBalanced injection of steam
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