Method and device for determining liquid output rules of commingled producing well

Abstract

The invention relates to a method and a device for determining liquid output rules of a commingled producing well and mainly aims at understanding layering liquid output rules of the commingled producing well and further improving the water injection efficiency. The device is characterized by comprising a multi-layer pore medium model, an injecting system and an output amount measuring system, wherein the injecting system and the output amount measuring system are connected with the left end and the right end of the multi-layer pore medium model respectively; the liquid output amount of each small layer can be calculated according to the pressure difference between an outlet end and an injecting end of each small layer in the model; a small hole is drilled in the connected center of a cavity at the right end of the model and an outer epoxy resin sleeve from right to left, and total outlet pressure and total liquid output amount of the multi-layer pore medium model are measured; by means of multiple experiments, relations between the ratio of the liquid output amount of each small layer in the multi-layer pore medium model to the total liquid output amount of the model and multiple influence factors including permeability, thickness, inlet and outlet pressure difference, kh/mu and the like can be obtained, a linear multivariate equation set is solved to determine coefficients of the multiple influence factors, and accordingly, the liquid output rule of each small layer in the commingled producing well is finally confirmed.

Description

Technical field: [0001] The invention relates to a method and a device used in the field of petroleum exploration and development in oilfields for determining the law of layered fluid flow in a combined production well. Background technique: [0002] The difference in sedimentary characteristics and development status of reservoirs leads to differences in geological factors such as vertical and horizontal heterogeneity of reservoirs. In addition, development factors such as water injection timing, injection-production intensity, and production measures of each layer are also different. , the distribution of remaining oil in the formation is extremely uneven and the difficulty of exploitation increases, leading to the formation of strong seepage channels, affecting the ultimate recovery rate and recoverable geological reserves, and directly leading to the reduction of economic benefits of the oilfield. The subdivided sub-layer geological conditions and development laws of the...

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Problems solved by technology

[0002] The difference in sedimentary characteristics and development status of reservoirs leads to differences in geological factors such as vertical and horizontal heterogeneity of reservoirs. In addition, development factors such as water injection timing, injection-production intensity, and production measures of each layer are also different. , the distribution of remaining oil in the formation is extremely uneven and the difficulty of exploitation increases, leading to the formation of strong seepage channels, affecting the ultimate recovery rate and recoverable geological reserves, and directly leading to the reduction of economic benefits of the oilfield

The subdivided sub-layer geological conditions and development laws have not been studied in the segmental fluid flow law, and the remaining oil distribution and strong seepage channels are unclear, which directly affects the water injection efficiency and ultimate recovery in the layer segment

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