Well test interpretation model and method for analyzing multi-fractured-cavity unit series structure

Abstract

The invention discloses a well-testing interpretation model used for analyzing a series structure of multiple fracture-cave units and methods. The model includes: merging fracture-karst-cave reservoirbodies in fracture-cave-type oil reservoirs into the fracture-cave units; merging fracture-corrosion-hole reservoir bodies in the fracture-cave-type oil reservoirs into the fracture-cave units; for carbonate-rock fracture-cave-type oil reservoirs, using the fracture-cave units and fracture-hole units to approximate radial sector structure bodies; and regarding connection areas between sectors aspressure conducting areas with no pressure dropping, namely being equal to boundary pressure of the preceding sector by pressure of an outflow end of the subsequent sector, and being equal to a boundary inflow amount of the preceding sector by an outflow amount of the subsequent sector. One of the methods includes applying the model to analysis and interpretation technology of the fracture-cave-type oil reservoirs. According to the well-testing technology solution used for analyzing the fracture-cave-type oil reservoirs provided by the invention, a well-testing technology blank of the fracture-cave-type oil reservoirs is filled, a utilization rate of well-testing data is increased, and a well-testing analysis means is provided for knowing and evaluating fracture-cave-type oil reservoir structures.

Description

technical field [0001] The invention relates to reservoir engineering well testing technology, in particular to a well testing interpretation model and method for analyzing the series structure of multi-fracture-cave units. Background technique [0002] Well testing is a general term for flow testing and analysis of oil, gas, and water wells. In the process of oil field development, special instruments and equipment are used to measure the working conditions of oil wells, such as pressure, production, and temperature. It can monitor the production status of oil wells. Predict the performance of the reservoir to understand the productive capacity of the reservoir, including measurement techniques and interpretation techniques. [0003] Carbonate fracture-cavity reservoirs are paleo-weathered crust reservoirs with fractures and caves as the main storage space. The storage space types are mainly dissolved pores and caves, large caves and dissolved fractures. The reservoir matri...

AI Technical Summary

Problems solved by technology

Conventional well test interpretation models are not suitable for fracture-cavity reservoirs with only local space flow. The “matrix-cave-fracture” triple-media seepage model traditionally applied to fracture-cavity reservoirs is based on the Reservoir conditions with flow inside and no flow outside fracture-cavities and fracture-holes are inconsistent. Although the triple-media model and the multi-zone radial composite model also produce some behaviors similar to the measured pressure recovery well test curves, they cannot reasonably explain and evaluate fractures. The composition structure of the cave reservoir, for example, for figure 1 For the well test curve shown, the radial compound model explains that the flow properties in the near-wellbore area are good, and the flow properties in the peripheral area are poor. The test shows that there are a large number of similar wells, all of which are good internally and externally poor. Such test interpretation and geological understanding are obvious does not match

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