Título del libro: Spe Latin American And Caribbean Petroleum Engineering Conference Proceedings
Título del capítulo: Induced Flow Geometries during Steam Injection in Unconsolidated Sand in Heavy and Extra-Heavy OiI Fields in Mexico
HEBER CINCO LEY;
Autores externos:
Idioma:
Año de publicación:
2023
Palabras clave:
Crude oil; Heavy oil production; Injection (oil wells); Sand; Flow geometries; Induced flows; Injection test; Interference tests; Linear-flow; Me-xico; Oil zone; Steam injection; Transient pressures; Unconsolidated sands; Steam
Resumen:
This objective of this paper is to demonstrate that transient linear flow is the dominant behavior inunconsolidated sands performing under steam injection in Mexico. It has been observed in the past and there is evidence from fall-off tests that all wells injecting water inunconsolidated sands that store heavy oil exhibit a condition similar to being fractured. Apparently, this isthe result of high mobility around the fracture. Something similar can occur during the processes of cyclicsteam and continuous steam injection in unconsolidated sands. This is investigated in detail in this paperwith different types of transient pressure tests. The paper presents the analysis of falloff, injection and interference tests carried out in steam injectionwells in an unconsolidated sand that stores extra-heavy oil. Subsequent to a series of steam injection cycles,the well exhibited a transient pressure behavior that is characteristic of linear geometry. The boundary ofthe linear flow behavior is associated with the extra-heavy oil zone not affected by steam. Furthermore,subsequent to a period of continuous gas injection (as opposed to the previous cyclic gas injection), it wasobserved that linear flow was prevalent again. In addition, an interference test was carried out between theinjection well and another well producing from the same unconsolidated sand. The interference pressuresignal at short times showed a behavior that corresponds to linear flow. The test also permitted to estimatethe compressibility of the unconsolidated sandstone. Based on the evidence collected during the differenttests, the conclusion is reached that during the processes of steam cyclic and steam continuous injection,a channel of high oil mobility was generated by the viscosity contrast of water and extra-heavy oil. Thischannel is limited by oil zones not affected by steam. The novelty of the paper is demonstrating that transient linear flow is prevalent throughout the fall-off,injection and interferences tests in the Mexican unconsolidated sand. It is likely that the same observationmight have application is other unconsolidated sands undergoing steam injection. © 2023 Society of Petroleum Engineers (SPE). All rights reserved.
Entidades citadas de la UNAM:
ISBN:
9781613999905
Editorial:
Society of Petroleum Engineers (SPE)
