Why Many Overpressured, Stress-Sensitive Hydrocarbon Reservoirs Should Not Be Abandoned

Chilingar, George V.; Rieke, Herman H.; Al-Anazi, Ammal Fannoush

doi:10.1080/00908310500341074

Cited by 4 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to study the relationship between the compressibility of the pore-fracture system and its effective stress, Zhang et al [11] conducted an experiment with the nuclear magnetic resonance technique, calculated the stress sensitivity of the pore and fracture, and discussed the variation of its heterogeneity. Based on many compaction researches of rocks, Chilingar et al [12] argued that well testing could be wrong due to the plastic deformation that increases the effective stress in undercompacted overpressured reservoirs, and thus, many erroneously condemned overpressured reservoirs should be reexamined and reevaluated, and techniques should be developed to recover the oil and gas from these stress-sensitivity reservoirs. Guo et al [13] and Meng et al [14] presented semianalytical models to evaluate production features in the stress-sensitivity carbonate gas reservoirs, which were considered triple-porosity media composed of matrix, fractures, and vugs.…”

Section: Introductionmentioning

confidence: 99%

Well-Testing Model for Dual-Porosity Reservoir considering Stress-Sensitivity and Elastic Outer Boundary Condition

Kim,

Han,

Song

et al. 2023

Geofluids

View full text Add to dashboard Cite

Stress sensitivity and the elastic outer boundary (EOB) condition have a great effect on the analysis of the characteristics of the fluid flow in a reservoir. When researchers analyzed the characteristics of the fluid flow, they have considered the stress sensitivity and the EOB condition separately but have not considered them simultaneously. Therefore, errors are inevitable during the analysis of well testing. The main object of this work is to present a well-testing model for stress-sensitivity dual-porosity reservoir (DPR) with EOB to improve the accuracy of the analysis of well-testing data. To this end, in this paper, we established a well-testing model for the DPR, considering the stress sensitivity and the EOB simultaneously, and presented its semianalytical solution. On the basis of the consideration of the EOB condition and stress sensitivity of permeability (SSP), a seepage model for the DPR with the EOB is built using the continuity equation, motion equation, state equation, and interporosity flow equation between matrix and fracture, which considers the stress sensitivity, wellbore storage, and skin. To solve this model, a nonlinear partial differential equation is changed into a linear form of a partial differential equation by introducing an effective well radius and applying Pedrosa’s transformation and perturbation transformation. Applying the Laplace transformation, an analytical solution in the Laplace space is obtained, and curves of pressure and pressure derivative (PPD) are drawn by numerically inverting them. The model is verified by comparing it with the EOB without consideration of SSP and using case data. The sensitivity of parameters on the curves of PPD is analyzed. This work may be significant for evaluating more accurately the parameters of wells and reservoirs using well testing.

show abstract

Section: Introductionmentioning

confidence: 99%