An Effective Method to Improve Recovery of Heavy Oil Reservoir with Bottom Water Drive

Ju, Binshan; Dai, Shugoa; Fan, Tailiang; Xiao-dong, Wang; Wu, Haiqing

doi:10.2523/iptc-10521-ms

Cited by 11 publications

(5 citation statements)

References 18 publications

(18 reference statements)

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“…Many heavy oil reserves located in Saskatchewan, Canada (Saskoil and Butler 1990), U.K continental shelf (Jayasekera 2000), Bohai Bay offshore China (Ju et al 2005), South Belridge, California, U.S (Fram and Palermo 1996) are underlined by active aquifers. Developing and producing of heavy oils with strong bottom water is difficult as primary recovery is limited by water coning.…”

Section: Introductionmentioning

confidence: 99%

Improved Thermal Heavy Oil Recovery from Strong Bottom-Water-Drive Reservoir by Combining SAGD with Downhole Water Sink

Qin

Wojtanowicz

Li³

2014

Day 1 Mon, December 08, 2014

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While SAGD (Steam Assisted Gravity Drainage) can be used to recovery heavy oil from strong bottom water drive reservoir, the bottom water is known to have a detrimental effect on the SAGD performance, may cause unsuccessful SAGD application. During SAGD process, the common practice to control the water encroachment is to keep the steam chamber pressure at or above the aquifer pressure. At higher pressure, less latent heat is available, leading to unprofitable SAGD project with low oil production rate and low oil recovery.In this paper, an innovative approach is proposed to tackle the problem by combining the use of SAGD with DWS (Downhole Water Sink). The concept of DWS is the first to be integrated into SAGD production process. With a new type of well completion design, along with the two separated wells of SAGD, another well is completed in the water zone to decrease the aquifer pressure through continuous water production. As the aquifer pressure decreasing, low steam chest pressure can be maintained, thus allowing for more latent heat available in the formation which would ensure high oil rate and high oil recovery.A theoretical study of SAGD-DWS performance on improving heavy oil recovery is conducted in this paper. A design model is developed to predict the optimum ranges of the SAGD-DWS production parameters under various operation scenario. The effects of the new approach on increasing oil rate and improving oil recovery in comparison to that of conventional SAGD are quantified. The results demonstrate that unlike other thermal recovery methods, the combined use of SAGD with DWS can prevent the water invasion into the steam chamber while allowing for low steam chamber pressure with high heat efficiency.

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Section: Introductionmentioning

confidence: 99%

Improved Thermal Heavy Oil Recovery from Strong Bottom-Water-Drive Reservoir by Combining SAGD with Downhole Water Sink

Qin

Wojtanowicz

Li³

2014

Day 1 Mon, December 08, 2014

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“…With the energy structure reform and economic development, the demand for oil resources continues to increase, and the world's oil reserves, especially high-quality and easy-to-recover oil reserves, continue to decrease. Among the proven oil resources, the proportion of heavy oil getting bigger [1][2][3][4] . Heavy oil resources can effectively alleviate the shortage of resources, Efficient and economic development of heavy oil resources has important practical and strategic significance [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Experimental study on enhancing heavy oil recovery by mobility control oil displacement agent

Zhang

Teng

Ban

et al. 2023

J. Phys.: Conf. Ser.

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The suitable concentration of mobility-controlled oil displacement agent was selected through laboratory experiments, and the development mechanism of mobility-controlled oil displacement agent in the water flooding process was studied. The results show that when the concentration of mobility control oil displacement agent is 0.15 %, the viscosity reduction effect is the best. Fluid injection pressure can be reduced by mobility controlled oil displacement agent. The mobility control oil displacement agent can improve the oil displacement efficiency, and the recovery rate of Tuha heavy oil is increased from 36.58 % to 65.13 %. The mobility control oil displacement agent has a strong effect of solubilization and viscosity reduction at low shear rate of the formation, and has a viscosity increase for water, so it can improve the development effect.

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“…For example, the oil field H.K., located in Shandong, China, is a typical heavy oil reservoir with bottom water drive. Viscosity of the reservoir crude is 710 cp and the current water-cut is 90% with only 1.0% recovery (7) . In Canada, the water cut can quickly be as high as 97% which given high operational costs of production, makes the process not economical (1) .…”

Section: Introductionmentioning

confidence: 99%

Well Performance Analysis for Heavy Oil With Water Coning

Qin

Wojtanowicz

2007

Canadian International Petroleum Conference

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As conventional petroleum is approaching its maximum production and the world oil demand continues to grow, heavy oil becomes one of the obvious replacement resources. By 2015, its contributions to total oil production would reportedly grow from the present 2.5 MMbpd to 4MMbpd and stay at this level for a couple of decades. Recovery of heavy oil reservoir with wells is a challenge due to low API gravities (6°-25°), high viscosity (100cp-1000cp)-particularly in the presence of water. For example, the recovery factor from a heavy oil reservoir with bottom water in the H.K. oilfield, Shandong province, in China, having viscosity of 710 cp does not exceed one percent.One of the most important problems in heavy oil recovery is dramatic loss of wells' productivity at the onset of water inflow due to the two fluids' mobility contrast. Not only the recovery at breakthrough time is very low, but also the water cut increase is extremely rapid. The presented simulation study investigates dynamics of productivity loss in wells producing heavy oil with bottom water. The production system (nodal) analysis model simulates inflow performance relationship with variable water cut. The model captures the difference between heavy and light oil in terms of mobility ratio effect, recovery dynamics prior to and after water breakthrough, and water cut control with production rate. The results show that preventing water breakthrough to wells in heavy oil is several-fold more important (in terms of well productivity and recovery rate) than that for conventional oil wells.

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An Effective Method to Improve Recovery of Heavy Oil Reservoir with Bottom Water Drive

Cited by 11 publications

References 18 publications

Improved Thermal Heavy Oil Recovery from Strong Bottom-Water-Drive Reservoir by Combining SAGD with Downhole Water Sink

Improved Thermal Heavy Oil Recovery from Strong Bottom-Water-Drive Reservoir by Combining SAGD with Downhole Water Sink

Experimental study on enhancing heavy oil recovery by mobility control oil displacement agent

Well Performance Analysis for Heavy Oil With Water Coning

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