Gas reservoir stress sensitivity evaluating experiment method considering bound water under formation condition

A stress-sensitive, formation-conditional technology for earthmoving, wellbore/well components, production fluids, etc.

Active Publication Date: 2019-12-13
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

There is a large difference between the existing experimental method and the seepage situation of the actual gas reservoir, which cannot truly represent the stress sensitivity of the gas reservoir

Method used

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  • Gas reservoir stress sensitivity evaluating experiment method considering bound water under formation condition
  • Gas reservoir stress sensitivity evaluating experiment method considering bound water under formation condition
  • Gas reservoir stress sensitivity evaluating experiment method considering bound water under formation condition

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Experimental program
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Effect test

Embodiment 1

[0182] 1. Core preparation, after extracting, cleaning and drying the core retrieved from the site, measure the length of the core L=7.41cm, diameter d=2.49cm, gas permeability K=10.8mD, porosity And calculate the cross-sectional area of ​​the core A=4.87cm 2 ;

[0183] 2. Fluid preparation: prepare simulated formation water according to the formation water sample data of the actual gas reservoir; take natural gas from the actual gas reservoir as the experimental gas; put the water sample intermediate container 27 at room temperature, and put the high-pressure gas sample into the gas sample intermediate container 28 Fill the humidification intermediate container 29 with 50% volume of formation water, then inject 50% high-pressure gas sample, and stir for 2 hours to make excess gas dissolve in the water.

[0184] 3. Experimental temperature and pressure, the confining pressure is 78.9MPa, the temperature is 151℃, the core pore pressure is 38MPa, 35MPa, 30MPa, 25MPa, 20MPa, 15...

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Abstract

The invention discloses a gas reservoir stress sensitivity evaluating experiment method considering bound water under the formation condition. The gas reservoir stress sensitivity evaluating experiment method comprises the steps of core preparation, fluid preparation, establishment of formation temperature and pressure conditions, establishment of core bound water saturation, stress sensitivity evaluation experiment, calculation of permeability under all test points in the stress sensitivity experiment, experiment concluding and the like, and the gas reservoir productivity of a reservoir witha core used in the experiment is predicted according to stress sensitivity damage degree evaluation obtained through experiment concluding. The temperature and pressure conditions of a real gas reservoir formation are effectively simulated, the influence of the formation bound water is fully considered, the measurement result better conforms to actual production, and the available value of experiment data is high; and the stress sensitivity situation of the formation in the production process can be more truly simulated through the experiment, the defect that the influences of the formation bound water and the temperature on results of the gas reservoir stress sensitivity evaluating experiment are not considered in an existing measurement method is overcome, and the experiment method is provided for obtaining gas reservoir stress sensitivity evaluating experiment data with the higher available value.

Description

technical field [0001] The invention relates to oil and gas exploration and development technology, in particular to an experimental measurement method for stress sensitivity evaluation of gas reservoirs considering bound water under formation conditions. Background technique [0002] Stress sensitivity evaluation data is an important basic data in gas field development. At present, the experimental test method of gas reservoir stress sensitivity evaluation is based on the standard SY / T 5358-2010 "Reservoir Sensitivity Flow Experimental Evaluation Method" using compressed air or nitrogen as the flow The medium is subjected to stress sensitivity evaluation experiments. For gas reservoirs containing irreducible water, the existing measurement methods do not consider the influence of irreducible formation water on the evaluation results of stress sensitivity. In the process of gas reservoir exploitation, changes in the effective overlying pressure of the formation will cause d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B43/16
CPCE21B49/00E21B43/168
Inventor 陈诚陈金定崔书姮张群王誉钧郭敏灵马双政
Owner CHINA NAT OFFSHORE OIL CORP
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