Completion system of oil and gas wells with regulatably controlling flows of formation fluid or filled fluid in divided sections

Abstract

A finished oil (or gas) well system able to segmentally control the stratum fluid or injected fluid is at least composed of the fluid regulating pipe in the well and the porous medium in the gap between said regulating pipe and well wall. Said fluid regulating pipe has fluid collecting holes, fluid collecting cavities and the flow controllers relative to said fluid collecting holes for regulating the flow of stratum fluid or injected fluid flowing through said fluid collecting hole. It is suitable for the multi-layer oil deposit to pack multiple segments.

Description

Technical field: [0001] The invention relates to an oil and gas well completion system for subdividing sections to regulate the flow of formation fluid or injection fluid, especially an oil and gas well suitable for application in heterogeneous and multi-production layer oil reservoirs. The fluid flow rate inside it is The invention is controllable and belongs to the technical field of oil exploitation. Background technique: [0002] Many oilfields have heterogeneous, multi-layered sandstone reservoirs with large interlayer, plane, and intralayer variability. In particular, there are large differences in permeability between layers, and these differences have a great impact on the development effect of the reservoir. Different development strata need to be distinguished during the mining process. Each well needs to be exploited in several or more than a dozen sub-layers. For this kind of multi-yield reservoir, during the development process, it is necessary to control the ...

AI Technical Summary

Problems solved by technology

[0011] 1. The number of layers sealed by the packer is limited. When there are more than four isolation areas to be separated, the separation operation is very difficult

[0012] 2. Due to the limited number of isolation areas sealed by packers, a single isolation area is relatively long. There may be oil, gas, and water producing layers in the same isolation area, and multi-phase fluids are mixed. The development of

[0013] 3. When it is necessary to adjust the isolation section, all the pipe strings must be taken out from the oil and gas well before the position of the packer can be adjusted. The workload is heavy and the operation is complicated

[0014] 4. In oil and gas wells with damaged or deformed casing, the packer cannot be used

[0015] 5. Due to the relatively long distance of the isolation section, the phenomenon of fluid layer channeling will occur between the different layers included in the same isolation section due to the difference in pressure, that is, the fluid in some layers flows into other layers, Therefore, it will affect the oil production

[0016] The above-mentioned shortcomings of oil and gas wells using packers restrict the further improvement of the economic benefits of oil and gas field development

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