Abstract
The existence of stress sensitivity effect made the percolation mechanism of low-permeability reservoirs significantly complex. Further, numerous reservoirs have composite stratum properties in actual development procedure. This paper based on the concept of permeability stress sensitivity presents an unsteady flow model for horizontal well taking both stress sensitivity and composite reservoir into account. Analytic solutions for the transient pressure and the rate decline behaviors are obtained by comprehensive utilization of regular perturbation method, Laplace transformation, orthogonal transformation, and Stehfest numerical inversion. The example analysis verifies that the proposed model is reliable and practical. Likewise, there is a discussion of the influence of permeability modulus and other relevant parameters on the transient pressure and the rate decline for horizontal well in stress-sensitive composite reservoir. The work of this paper improved the previous researches and provided a more accurate basis for transient flow analysis and formation evaluation of this typical reservoir.
Highlights
The development of low-permeability gas reservoirs has received considerable attention because of the decrease of conventional oil and gas resources
This paper proposed a new analytical solution to analyze pressure transient behavior and transient rate decline of horizontal well in stress-sensitive composite gas reservoir
The position of pressure type curve increased with increasing permeability modulus, and the production rate decreased with increasing permeability modulus
Summary
The development of low-permeability gas reservoirs has received considerable attention because of the decrease of conventional oil and gas resources. Guo et al (2015) proposed a semianalytical solution method to analyze the fluid flow in the fractured horizontal well and discussed the influence of various parameters on the transient pressure behavior [4]. Wang et al (2010) through sink-source superposition and integral transformation obtained a new model with consideration of dual permeability in composite reservoir and discussed the influence of different outer boundaries on the transient pressure [10]. This paper proposed an unsteady flow model for horizontal well with consideration of stress sensitivity in composite reservoir and acquired the analytical solution of the model by utilizing fluid mechanics in porous medium, mathematical physical methods, and fathoming strategies for complex science. We discussed pressure transient behavior and watched its distinctive flow stages and analyzed the rate decline characteristics of horizontal well in composite gas reservoir. The proposed model is more in accordance with the actual conditions; it can provide a more accurate guidance for the formation evaluation and the development of this type of reservoirs
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