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Method of evaluating tight reservoir mobile fluid distribution characteristics

A fluid distribution and tight reservoir technology, applied in the field of oil and gas field development, can solve the problems of accurate determination error, different heterogeneity, inaccurate movable fluid parameters, etc., and achieve the effect of rapid measurement and reduction of experimental error

Pending Publication Date: 2019-07-19
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

However, there are still some errors in the accurate determination of the movable fluid percentage in tight reservoirs by the existing testing methods and methods. s difference
If the optimal centrifugal force of the sample is not accurately determined first, the movable fluid parameters measured by the NMR centrifugation experiment will be inaccurate, which will affect the real movable fluid distribution characteristics of the sample

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  • Method of evaluating tight reservoir mobile fluid distribution characteristics
  • Method of evaluating tight reservoir mobile fluid distribution characteristics
  • Method of evaluating tight reservoir mobile fluid distribution characteristics

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] The method of the present invention is used to study the movable fluid characteristics of 6 typical tight rock samples under different sublayers of Chang 8 Member of Jiyuan Oilfield. The Ordos Basin spans the five provinces of Shaanxi, Gansu, Ningxia, Mongolia, and Shanxi, with a total area of ​​37×10 4 km 2 , which is an earlier region for tight oil and gas exploration and development in my country, where tight oil and gas resources are very rich and have broad development prospects. Jiyuan Oilfield is located in the west of the Ordos Basin, straddling the Yishan Slope and Tianhuan Depression. The Triassic Yanchang Formation is divided into 10 oil-layer groups from top to bottom. Among them, the Chang 8 oil-layer group in the study area is relatively developed and is the main force of exploration and development. Reservoir group. D...

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Abstract

The invention discloses a method of evaluating tight reservoir mobile fluid distribution characteristics. The method comprises the steps that (1) a rock sample is subject to oil washing, and porosityand permeability are measured after drying; (2) the rock sample is saturated to simulate formation water, and a nuclear magnetic resonance T<2> spectrum is measured; (3) a centrifugation experiment ofwater displacement by oil is performed on the rock sample, and optimal centrifugal force is determined; (4) the optimal centrifugal force is selected, and a nuclear magnetic resonance T<2> spectrum after centrifugation is measured; (5) a nuclear magnetic resonance T<2> cut-off value is determined; and (6) the mobile fluid distribution characteristics are obtained. According to the method, based on the principle of a nuclear magnetic resonance mobile fluid test, the optimal centrifugal force of the rock sample is determined first, then the nuclear magnetic resonance T<2> spectrum after centrifugation is measured according to the optimal centrifugal force, the T<2> cut-off value is determined, and the mobile fluid distribution characteristics of the rock sample are obtained. Through the method, an experiment error can be effectively lowered, and a tight reservoir mobile fluid percent can be determined more truthfully, accurately and rapidly.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for evaluating the distribution characteristics of movable fluid in tight reservoirs. Background technique [0002] In recent years, with the decrease of conventional oil and gas resources, the exploration and development of unconventional energy, especially tight oil and gas, has been increased worldwide. Tight oil and gas account for a large proportion of my country's oil and gas composition, and improving the development effect of tight oil and gas reservoirs is of great significance to ensure national energy security. [0003] The occurrence state of fluid in the pores of tight sandstone can be divided into movable fluid and bound fluid. The movable fluid refers to the free fluid that can overcome the capillary force or viscous force and participate in the flow under a certain external force (i.e., the surface of the pore throat). On the contra...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
CPCG01N24/081G01N24/082Y02A90/30
Inventor 黄兴高辉张楠李天太
Owner XI'AN PETROLEUM UNIVERSITY
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