Experimental study on lateral flooding for enhanced oil recovery in bottom-water reservoir with high water cut

You, Qing; Wen, Quanyi; You, Qing; Guo, Min; Zhang, Qingsheng; Dai, Caili

doi:10.1016/j.petrol.2018.11.053

Cited by 83 publications

(29 citation statements)

References 27 publications

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“…44 The electrode detection points were located near the pressure-measuring points in the core, which were distributed at equal distances of 1.8 m along the streamline direction.…”

Section: Oil Saturationmentioning

confidence: 99%

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Migration characteristics and deep profile control mechanism of polymer microspheres in porous media

Niu

2019

Energy Science & Engineering

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The performance and migration characteristics of polymer microspheres in porous media and the mechanism of deep profile control for oil displacement were studied by theoretical analysis, instrument detection, and physical simulation to further improve oil recovery. Polymer microspheres were expansive in water and nonexpansive in oil. The polymer microspheres with short expansion times possessed excellent mechanical shear resistance. According to the matching factor (Ra), resistance factor, and residual resistance factor, the migration of polymer microspheres in porous media was divided into four periods: transportation (Ra > 2.41), bridging plugging (1 < Ra < 2.41), elastic plugging (Ra < 1), and fatigue (microsphere breakage). The resistance factor and residual resistance factor of the polymer microspheres during the bridging and elastic plugging periods were larger than those during other periods. The deep oil displacement profile can be controlled by adjusting the occurrence positions (distance from the injection end) of these two periods. Increasing the injection rate during the transportation and bridging plugging periods and decreasing the injection rate during the elastic plugging period made elastic plugging occur farther from the injection end while maintaining the resistance factor and residual resistance factor at high levels. Aimed at the remaining oil accumulation area, the optimal profile control depth of oil displacement (distance from the injection end) of polymer microspheres in porous media can be regulated by changing the injection rate to enhance oil recovery. The simultaneous migration and expansion of polymer microspheres is the main mechanism of microsphere fluid diversion in porous media.

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“…44 The electrode detection points were located near the pressure-measuring points in the core, which were distributed at equal distances of 1.8 m along the streamline direction.…”

Section: Oil Saturationmentioning

confidence: 99%

“…(d) The pressure and water cut were recorded during displacement, and the oil recovery was calculated. (e) The resistivity of each core section at the end of water saturation, oil saturation, water flooding, chemical flooding, and subsequent water flooding was recorded, 44 and the remaining oil saturation was calculated.…”

Section: Oil Displacement Experimentsmentioning

confidence: 99%

Migration characteristics and deep profile control mechanism of polymer microspheres in porous media

Niu

2019

Energy Science & Engineering

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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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“…Cheng et al aimed to optimize the scale of the stimulated reservoir volume (SRV) by conducting an experiment to verify the water injection capacity of the Chang 7 Formation, which is situated within a typical tight oilfield [5]. You et al put forward the method of horizontal displacement of the reservoir for lateral displacement to improve the development effect of the bottom-water reservoir and the results of the physical model test showed that this method can effectively improve the recovery of the bottom-water reservoir [6]. Unstable water injection is an earlier proposed technique by hydrodynamic methods to improve water flooding recovery [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Unstable water injection is an earlier proposed technique by hydrodynamic methods to improve water flooding recovery [7][8][9][10][11][12][13]. In the early field test, most of the low permeability reservoirs with strong heterogeneity have adopted the method of the changing water injection rate to realize the exchange of oil and water, which can achieve the purpose of enhanced oil recovery [5][6][7][8][9][10][11]. However, in mid-high permeability reservoirs, the capillary pressure is less effective and the dialysis is ineffective, so improving sweep efficiency of water flooding is the most effective way to enhance oil recovery.…”

Section: Introductionmentioning

confidence: 99%

Asynchronous Injection-Production Process: A Method to Improve Water Flooding Recovery in Complex Fault Block Reservoirs

Yuan

Wang

Jiang

et al. 2020

Mathematical Problems in Engineering

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The complex fault block reservoir has the characteristics of small area and many layers in vertical. Due to the influence of formation heterogeneity and well pattern, the situation that “water fingering is serious with water injection, on the contrary, driving energy is low” frequently occurs in water flooding, which makes it difficult to enhance oil recovery. Asynchronous injection-production (AIP) process divides the conventional continuous injection-production process into two independent processes: injection stage and production stage. In order to study oil recovery in the fault block reservoir by AIP technology, a triangle closed block reservoir is divided into 7 subareas. The result of numerical simulation indicates that all subareas have the characteristic of fluid diverting and remaining oil in the central area is also affected by injected water at injection stage of AIP technology. Remaining oil in the central area is driven to the included angle and border area by injected water and then produced at the production stage. Finally, the oil recovery in the central area rises by 5.2% and in the noncentral area is also increased in different levels. The AIP process can realize the alternative change of reservoir pressure, change the distribution of flow field, and enlarge the swept area by injected water. To sum it up, the AIP process is an effective method to improve the oil recovery in complex fault-block reservoir by water flooding.

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Experimental study on lateral flooding for enhanced oil recovery in bottom-water reservoir with high water cut

Cited by 83 publications

References 27 publications

Migration characteristics and deep profile control mechanism of polymer microspheres in porous media

Migration characteristics and deep profile control mechanism of polymer microspheres in porous media

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

Asynchronous Injection-Production Process: A Method to Improve Water Flooding Recovery in Complex Fault Block Reservoirs

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