Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental Study of Hydraulic Fracturing for Unconsolidated Reservoirs
Abstract Fracturing sand control technology is a commonly used method to increase production and control sand in unconsolidated sandstone reservoirs. However, some unconsolidated sandstone reservoirs are difficult to fracture because the rock is weakly consolidated. Therefore, determining the fractability of unconsolidated sandstone reservoirs is taken as the basis of fracturing sand control. In this study, various influencing factors on the fracture initiation and fracture shape were comprehensively investigated through true triaxial fracturing simulation experiments on the artificially unconsolidated rock samples. The results show that for unconsolidated sandstone formations, high permeability corresponds to the high injection rate required for fracture initiation; low strength of the rock base material and low effective stress under great leak-off of fracturing fluids correspond to low fracture pressure. These correlations become more significant as the cementation degree decreases. Increasing the injection rate has the optimal effect on shortening the fracture initiation time when the construction conditions approach the critical value where fractability is realized. At a low in situ stress difference, the control effects on the fracture strike and number were weakened, and the reservoir was more difficult to fracture and propagate. A new model for evaluating fractability that considers the leak-off of fracturing fluids was established by combining conventional fracture theory with Darcy’s flow equation. The model can accurately judge whether unconsolidated sandstone formations can be successfully fractured under different reservoir properties and construction parameters (mainly, include the viscosity and the injection rate of fracturing fluid, etc.).
Highlights Various influencing factors on the fracture initiation, propagation and fracture shape are comprehensively investigated through true triaxial fracturing simulation experiments on the artificially unconsolidated rock samples.The leak-off of fracturing fluids is a crucial factor affecting fracture initiation and propagation in unconsolidated reservoirs.Increasing the injection rate has the optimal effect on shortening the fracture initiation time when the construction conditions approach the critical value where fractability is realized.The range of the cementation degree of unconsolidated reservoirs to which fracturing technology is applicable under various in situ stresses presents an upper limit.A model for evaluating the fractability of unconsolidated reservoirs that considers the leak-off of fracturing fluids is established and validated.
Experimental Study of Hydraulic Fracturing for Unconsolidated Reservoirs
Abstract Fracturing sand control technology is a commonly used method to increase production and control sand in unconsolidated sandstone reservoirs. However, some unconsolidated sandstone reservoirs are difficult to fracture because the rock is weakly consolidated. Therefore, determining the fractability of unconsolidated sandstone reservoirs is taken as the basis of fracturing sand control. In this study, various influencing factors on the fracture initiation and fracture shape were comprehensively investigated through true triaxial fracturing simulation experiments on the artificially unconsolidated rock samples. The results show that for unconsolidated sandstone formations, high permeability corresponds to the high injection rate required for fracture initiation; low strength of the rock base material and low effective stress under great leak-off of fracturing fluids correspond to low fracture pressure. These correlations become more significant as the cementation degree decreases. Increasing the injection rate has the optimal effect on shortening the fracture initiation time when the construction conditions approach the critical value where fractability is realized. At a low in situ stress difference, the control effects on the fracture strike and number were weakened, and the reservoir was more difficult to fracture and propagate. A new model for evaluating fractability that considers the leak-off of fracturing fluids was established by combining conventional fracture theory with Darcy’s flow equation. The model can accurately judge whether unconsolidated sandstone formations can be successfully fractured under different reservoir properties and construction parameters (mainly, include the viscosity and the injection rate of fracturing fluid, etc.).
Highlights Various influencing factors on the fracture initiation, propagation and fracture shape are comprehensively investigated through true triaxial fracturing simulation experiments on the artificially unconsolidated rock samples.The leak-off of fracturing fluids is a crucial factor affecting fracture initiation and propagation in unconsolidated reservoirs.Increasing the injection rate has the optimal effect on shortening the fracture initiation time when the construction conditions approach the critical value where fractability is realized.The range of the cementation degree of unconsolidated reservoirs to which fracturing technology is applicable under various in situ stresses presents an upper limit.A model for evaluating the fractability of unconsolidated reservoirs that considers the leak-off of fracturing fluids is established and validated.
Experimental Study of Hydraulic Fracturing for Unconsolidated Reservoirs
Yan, Chuanliang (Autor:in) / Chen, Yong (Autor:in) / Chen, Tianqing (Autor:in) / Cheng, Yuanfang (Autor:in) / Yan, Xinjiang (Autor:in)
2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
Numerical Study of High Pressure Injection in Unconsolidated Reservoirs
| British Library Conference Proceedings | 2014
Comparative study on hydraulic conductivity of unconsolidated sediments
| Engineering Index Backfile | 1965
An experimental study of hydraulic fracturing
| TIBKAT | 1980