Method for calculating viscosity of crude oil in offshore sandstone reservoir stratum

Abstract

The invention discloses a method for calculating the viscosity of crude oil in an offshore sandstone reservoir stratum, and relates to the technical field of sandstone reservoir development. The method is used for determining whether the assay analysis content is complete or not according to the physical property analysis experiment result of the crude oil in an oil well of which the viscosity of the crude oil in the stratum needs to be calculated. The invention discloses two calculation methods. According to the first method, the viscosity of the crude oil in the offshore sandstone reservoir stratum is accurately calculated by using rich physical property analysis experiment data of the crude oil, the error of the calculation result is small, and the calculation precision of the viscosity of the crude oil in the offshore sandstone reservoir stratum is effectively improved. The method is wide in application range, flexible and easy to operate; and according to the second method, the viscosity of the crude oil in the stratum can be accurately calculated only by using the relative density API degree of petroleum, the physical property analysis experiment parameters of the crude oil required by the method are very few, the viscosity of the crude oil in the stratum can be accurately calculated, the sampling and assay cost in the oilfield development process is reduced, and when ground sampling analysis is carried out in the future, part of assay analysis parameters can be reduced, and the sampling and assay cost is saved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for calculating the viscosity of crude oil in an offshore sandstone reservoir formation. Background technique [0002] Formation crude oil viscosity is an indispensable important parameter to determine the type of reservoir, formulate oilfield development plan and carry out reservoir engineering calculation. [0003] Aiming at the method of determining the viscosity of formation crude oil, many scholars at home and abroad have conducted research and proposed corresponding methods. At present, there are four main methods to obtain the viscosity of formation crude oil: (1) directly obtain it by using the experiment of phase characteristics of crude oil; (2) adopt the method of analogy, borrow the measured formation crude oil of adjacent oilfields, adjacent blocks or adjacent formations Viscosity, if there is no adjacent block or adjacent layer, then ...

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Problems solved by technology

[0005] The purpose of this application is to overcome the problem of poor versatility in the calculation method of formation crude oil viscosity in the prior art, and on the basis of the existing technology, fully consider the actual situation of the oil field, and propose a calculation method for the viscosity of crude oil in the offshore sandstone reservoir formation method

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