Evaluation method and equipment for fluid production contribution rate of single-stage fractures based on pressure drop data

Abstract

The embodiment of the present invention provides a method and equipment for evaluating the fluid production contribution rate of a single-stage fracture based on pressure drop data. The method includes: determining the reservoir closure pressure of the target well; The expression of reservoir fluid loss coefficient is determined by formula; the maximum fracture height is determined by solving the fracture height equation; the maximum fracture width is determined according to the maximum fracture height and reservoir closure pressure, and the average fracture width is determined according to the maximum fracture width; Reservoir fluid loss coefficient expression, maximum fracture height and maximum fracture width, determine the fracture length, and determine the half-fracture length; according to the measured fracture porosity, formation thickness, fracture liquid phase pressure, liquid phase viscosity, liquid phase volume coefficient, Bottomhole pressure, as well as the average fracture width and half-fracture length, determine the fluid production of the target fracture; determine the contribution rate of the target fracture according to the fluid production of the target fracture and the total fluid production at the bottom of the hole, and can accurately evaluate a single section The fluid production contribution rate of fractures is low, and the cost is low.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of oil and gas field development, and in particular to a method and equipment for evaluating the liquid production contribution rate of a single-stage fracture based on pressure drop data. Background technique [0002] With the continuous application and technical progress of hydraulic fracturing technology in oilfield development, how to better evaluate the operation effect of hydraulic fracturing has become an important part of hydraulic fracturing verification. Among them, the evaluation of the fluid production contribution of a single fracture under multiple fractures has gradually become an important index for evaluating the operation effect of hydraulic fracturing. [0003] At present, the existing methods for studying the contribution rate of fracture fluid production are mainly: directly measure the total fluid production and the fluid production of each fracture, and calcul...

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Problems solved by technology

However, this method has high operating cost, long cycle and poor practicability.

In addition, monitoring fracture flow by adding tracers is also a method to obtain the contribution rate of fracture fluid production, but there are few types of tracers that have been found and can be applied so far, which cannot meet the requirements of multi-stage fracturing horizontal wells for all fracture flows. Therefore, the flow rate of fractures at all levels cannot be obtained, that is, the contribution rate of fluid production from fractures at all levels cannot be accurately calculated

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