Experimental investigation on water flooding and continued EOR techniques in buried-hill metamorphic fractured reservoirs

Wang, Jing; Liu, Huiqing; Zhang, Jing; Meng, Qingbang; Liu, Huapu; Ge, Lizhen; Zhu, Zhiqiang; Liu, Chang

doi:10.1016/j.petrol.2018.07.051

Cited by 23 publications

(10 citation statements)

References 27 publications

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“…29 In addition, some profile control agents will enter the low-permeability reservoirs and remain in the matrix, thus polluting the low-permeability reservoirs. 30 Therefore, an oil displacement method that neither pollutes the formation nor changes its structure to improve the heterogeneity of the oil layer is highly significant. To address these requirements, Daqing Oilfield has put forward a concept of oil displacement by layered injection.…”

Section: Introductionmentioning

confidence: 90%

“…Although profile control can obviously enhance the oil recovery from heterogeneous reservoirs, the injected profile control agent will block the high-permeability reservoirs after profile control is performed . In addition, some profile control agents will enter the low-permeability reservoirs and remain in the matrix, thus polluting the low-permeability reservoirs . Therefore, an oil displacement method that neither pollutes the formation nor changes its structure to improve the heterogeneity of the oil layer is highly significant.…”

Section: Introductionmentioning

confidence: 99%

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Effect of a Partial Pressure Tool on Improving the Heterogeneous Oil Recovery and Polymer Solution Microstructure

Huang

et al. 2020

ACS Omega

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To improve the oil displacement effect of polymer solutions in heterogeneous oil layers and increase the energy utilization rate, Daqing Oilfield proposes a partial pressure tool to control the polymer solution injection amount in high-permeability oil layers and increase the injection amount in low-permeability oil layers to enhance the total oil recovery. To study the effect of the partial pressure tool on enhancing oil recovery and the action mechanism of the tool on polymer molecules in high-permeability reservoirs, core displacement experiments were performed to study the effects of various factors on oil recovery. Microscopic experiments were then carried out to study the differences in molecular morphology and molecular coil size of the microscopic polymer solution before and after the action of the partial pressure tool. The experimental results show that the partial pressure tool increased the oil recovery by 4.4% and that the throttling pressure difference was directly proportional to the oil recovery. The partial pressure tool subjected the polymer solution to shear deformation and reduced the molecular coil size. When the concentration of the solution was changed, the degree of change in the molecular structure and the coil size was small, and the influence on the oil displacement effect was minimal. This experiment is of great significance for improving the energy utilization rate.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Effect of a Partial Pressure Tool on Improving the Heterogeneous Oil Recovery and Polymer Solution Microstructure

Huang

et al. 2020

ACS Omega

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“…Generally, the oil production mechanism of water soaking is attributed to imbibition (Wang et al 2018). Imbibition is significantly important in tight oil reservoir since capillary force is more dominant in such Formation (Yang et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Mechanisms and capacity of high-pressure soaking after hydraulic fracturing in tight/shale oil reservoirs

et al. 2020

Self Cite

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Huff-n-puff by water has been conducted to enhance oil recovery after hydraulic fracturing in tight/shale oil reservoirs. However, the mechanisms and capacity are still unclear, which significantly limits the application of this technique. In order to figure out the mechanisms, the whole process of pressurizing, high-pressure soaking, and depressurizing was firstly discussed, and a mechanistic model was established. Subsequently, the simulation model was verified and employed to investigate the significances of high-pressure soaking, the contributions of different mechanisms, and the sensitivity analysis in different scenarios. The results show that high-pressure soaking plays an essential role in oil production by both imbibition and elasticity after hydraulic fracturing. The contribution of imbibition increases as the increase in bottom hole pressure (BHP), interfacial tension, and specific surface area, but slightly decreases as the oil viscosity increases. In addition, it first decreases and then slightly increases with the increase in matrix permeability. The optimal soaking time is linear with the increases of both oil viscosity and BHP and logarithmically declines with the increase in matrix permeability and specific surface area. Moreover, it shows a rising tendency as the interficial tension (IFT) increases. Overall, a general model was achieved to calculate the optimal soaking time.

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“…In addition, the residual fracturing fluid may form two‐phase seepage resistance and reduce the effective permeability of the oil phase 32 ; for CO 2 flooding, CO 2 injection may bypass the remaining oil zone and tend to flow through fractures, resulting in low sweep efficiency 33‐35 ; for profile control, the injected gel permanently blocks the high‐permeability layer 36 . In addition, the flexibility of the gel allows it to enter the low‐permeability layer and remain in the matrix, thus causing contamination in the low‐permeability region 37,38 . Therefore, it is of great research significance to propose a layered injection method, which can improve the injection effect of the displacement agent in heterogeneous reservoirs and enhance the total oil recovery by using partial pressure tools and partial quality tools without changing the original formation structure and polluting the formation.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of ASP flooding to improve oil recovery in heterogeneous reservoirs by layered injection approach

Huang

et al. 2020

Energy Science & Engineering

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To improve the oil displacement effect of ASP (alkali/surfactant/polymer) solution in heterogeneous oil reservoirs, layered injection technology is proposed for the first time for Daqing Oilfield. The technology uses partial pressure tools to control the injection amount of ASP solution in high‐permeability oil layers and uses a partial quality tool in low‐permeability oil layers. To study the experimental effect of this layered injection technology, the relationships between the different permeability, molecular weight, and concentration of the ASP solution, as well as the resistance coefficient and residual resistance coefficient, are first established, and then, a layered injection experimental model is established to carry out experimental research on injection capacity and oil displacement capacity. The experimental results show that the smaller the range of the core permeability is, the larger the molecular weight and concentration of the ASP solution are, and the poorer the injection capacity of the ASP solution is. After the action of a partial pressure tool and a partial quality tool, the injection capacity of ASP solution is improved to different degrees, and the oil displacement effect of low‐permeability cores is significantly improved, while the total oil recovery is increased, and the total oil recovery of heterogeneous cores under different conditions is increased by 1.4%‐4.05%. This experiment is of great significance to the study of improving the oil recovery of heterogeneous reservoirs.

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Experimental investigation on water flooding and continued EOR techniques in buried-hill metamorphic fractured reservoirs

Cited by 23 publications

References 27 publications

Effect of a Partial Pressure Tool on Improving the Heterogeneous Oil Recovery and Polymer Solution Microstructure

Effect of a Partial Pressure Tool on Improving the Heterogeneous Oil Recovery and Polymer Solution Microstructure

Mechanisms and capacity of high-pressure soaking after hydraulic fracturing in tight/shale oil reservoirs

Experimental evaluation of ASP flooding to improve oil recovery in heterogeneous reservoirs by layered injection approach

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