Development of an imbibition-gravity model: a support mechanism to increase the recovery factor in northwestern Peru.
DOI:
https://doi.org/10.21754/tecnia.v16i1.405Keywords:
imbision-gravity model, recovery factorAbstract
The objective of this work is to characterize the mechanism of imbibition, both forced and spontaneous, through the formulation and solution of a mathematical physical model that allows the estimation of the injection rate to achieve imbibition assistance, as well as the prediction of oil production in reservoirs that have similar characteristics to those of the Peruvian northwest. The reservoirs in the northwest are good candidates for additional oil recovery through the water imbibition process, since the low permeability of these reservoirs allows a better performance of capillary forces and the hydraulic fractures provide an important contact area between the rock and the fluid, generating an important opportunity for additional oil recovery. Through this mechanism, it is feasible that mobile oil, without energy to move within the reservoir, can be expelled and replaced by a wetting fluid (injection water). The effectiveness of this process depends on parameters such as: size and compartmentalization of the reservoir (faulted block), porosity and permeability of the rock, fluid viscosity, interfacial stresses, wettability of the rock and contact area between the imbibed fluid and the porous rock. The proposal called WAIGD/PI (Waterflooding assisted imbibition and gravity drainage Production/Injection WAIGD/PI), consists of injecting water and taking advantage of the characteristics of the imbibition and gravity drainage mechanism through an alternate injection-production process by the same well. This proposal optimizes the economic parameters and minimizes the technical risk (drilling cost savings and flexibility in the arrangements based on the response to injection) achieving the recovery of additional reserves and increased production in this type of reservoirs. To achieve the optimal assistance of capillary forces through the imbibition mechanism, injection at low rates is recommended, according to the formula obtained in the analysis presented.
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