Abstract
Stress sensitivity is a crucial engineering problem in the process of tight gas reservoir development. In this work, the experiments about tight gas reservoirs are performed by confining pressure for a long time to simulate tight gas reservoirs under pressure for a long time during production process. The cores used in the test were from Ordos Basin, which is a typical tight gas reservoir. The results show that the stress sensitivity is increasing with compression time extended. Evaluation method for stress sensitivity about tight reservoirs was established based on time scale. The stress sensitivity for tight gas reservoirs was divided into two feature segments from time scale, which were named instantaneous stress sensitivity and delayed stress sensitivity. The conventional evaluation method for stress sensitivity about tight reservoirs has only considered the instantaneous stress sensitivity, and the delayed stress sensitivity has been ignored. The new method can more accurately simulate the stress sensitivity for tight gas reservoir, which has great guiding significance in rational development for tight gas reservoir. DOI: http://dx.doi.org/10.5755/j01.mech.24.6.22462
Highlights
With the continuous development of petroleum industry, tight oil and gas reservoirs will occupy an increasingly important position in the oil and gas resource strategy
The effective stress is gradually increasing with formation fluid production, which led to reservoir deformation, and porosity and permeability decrease
The results show that the permeability is decreasing with confining pressure increasing
Summary
With the continuous development of petroleum industry, tight oil and gas reservoirs will occupy an increasingly important position in the oil and gas resource strategy. The seepage characteristic is the key research content of tight reservoir. During the drilling and development process, the formation pressure changes and the seepage characteristics of the reservoir rock change correspondingly. The effective stress is gradually increasing with formation fluid production, which led to reservoir deformation, and porosity and permeability decrease. This phenomenon is called stress sensitivity, which would produce negative impact on oil and gas field exploration [1,2,3,4,5]. A number of scientists had regarded stress sensitivity as an important research subject
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