Method and device for predicting oil and gas yield of compact oil and gas reservoir horizontal well

Abstract

The invention provides a method and device for predicting the oil and gas yield of a compact oil and gas reservoir horizontal well. The method comprises the steps of establishing a reservoir structural exponential model and a productivity heterogeneous exponential model of a drilled vertical shaft according to drilling data of the drilled vertical shaft; establishing a largest monthly yield prediction model of the drilled vertical shaft according to the reservoir structural exponential model and the productivity heterogeneous exponential model; establishing a largest monthly yield prediction model of the horizontal well to be drilled at the position corresponding to the drilled vertical shaft according to the largest monthly yield prediction model of the drilled vertical shaft; establishing a yield predication model changing along with production time of the horizontal well to be drilled according to the largest monthly yield prediction model of the horizontal well to be drilled to predict the oil and gas yield changing along with the production time of the horizontal well to be drilled. By means of the method and device for predicting the oil and gas yield of the compact oil and gas reservoir horizontal well, the actual predicted yield matched with the oil and gas yield of the compact oil and gas reservoir horizontal well better can be obtained.

Description

technical field [0001] The invention relates to the technical field of exploration and development of tight oil and gas reservoirs, in particular to a method and device for predicting oil and gas production of horizontal wells in tight oil and gas reservoirs. Background technique [0002] With the rapid development of oil and gas exploration and development from conventional oil and gas reservoirs to unconventional oil and gas (ie tight oil and gas), tight oil and gas has gradually become an important field of oil and gas exploration and development. In the process of exploration and development of tight oil and gas, the core area is selected through evaluation, in which vertical wells are first drilled and the target interval is determined through evaluation, and then horizontal wells and volume fracturing are used to exploit tight oil and gas reservoirs in the target interval. However, not all horizontal wells in the core area can obtain economic oil and gas production aft...

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Problems solved by technology

[0003] Different from the flow of oil and gas in conventional oil and gas reservoirs according to the seepage principle, the overburden matrix permeability of tight reservoirs is very low (generally less than 0.1mD), and there is a certain starting pressure. After large-scale volume fracturing, oil and gas in tight reservoirs exist Seepage, diffusion and other flow modes, that is to say, the fluid flow mechanism in tight reservoirs does not fully conform to the seepage theory. Therefore, the existing technology still uses the oil and gas production prediction model based on the seepage theory, which is not applicable to the production of tight oil and gas reservoirs. It is difficult to accurately reflect the relationship between the production of oil and gas wells over time, and the error is relatively large

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