| The injection-production technology in the same well mainly applied to separating oil and water of high water cut mixture fluid.The technology system consist dual-action pumps in the same well that is production pump and injection pump.The separated oil is directly lifted to the ground by the production pump and the concentrated water is injected into the formation by the injection pump.The core of the injection-production in the same well technology is down-hole oil-water separation system,On the one hand,the process faces the problem that the gas-containing downhole production fluid will seriously affect the oil-water separation efficiency;On the other hand,a large number of oil wells currently use submersible screw pumps to lift the crude oil under the formation to the ground,If too much gas enter screw pump channel can produce cavitation phenomenon seriously even cause air lock and stop pump that are threaten for safety production of the down-hole condition.So it is necessary to put forward a gas-liquid separator which is suitable for high gas condition in oil well and prevent gas has a potential damage for screw pump and follow up oil water separation processing.The current down hole oil water separation system is made of single hydro-cyclone aim at the injection-production technology.Different gas volume effect on separation system flow filed change and law of influence of separation characteristic are analyzed by Computational Fluid Dynamics(CFD)method.Then a new style of down-hole gas-liquid separator which is suitable for screw pump is put forward.Meanwhile,creatively put the new style separator between the motor and screw pump to form a complied set connection scheme.The down hole gas liquid separator optimal parameters is finished by using Response Surface Methodology(RSM).After optimization the new style gas-liquid separator can make sure the gas and liquid separation effectively with different gas volume,lightening the bad effect on the subsequent oil water separation and screw pump indirectly.The interflow filed characteristic and separation performance of the after optimization gas liquid separator are analyzed,the law of influence of interflow field characteristic and performance change of separator was studied from different inlet flow,gas phase concentration,inlet pressure condition and applicability to different working conditions are summarized.The study results show that: the gas-liquid separation efficiency increases gradually with the increase of the inlet flow;the gas-liquid separation efficiency first increases then decreases with the increase of the gas concentration;the gas-liquid separation efficiency gradually decreases with the inlet pressure increases.At the same time,an indoor gas-liquid separator test system under gas-containing conditions is constructed to study the application effect of the optimal processing capacity of the new gas-liquid separation system.Finally the test data is calculated and influence of gas-liquid separator performance with different operated conditions is obtained,The experimental results show that the designed gas-liquid separator meet the application conditions of different working conditions under the condition of ensuring the separation performance,indicating that its separation efficiency is high and the applicability widely.This study provide practical experiments and data support for the further popularization and application of down-hole gas-liquid separators.Finally,the experimental data were counted and the effect of different operating conditions on the separation performance of the gas-liquid separator was obtained. |
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