Experimental Study on the Draw-Down Pressure Control of Horizontal Wells with Gas-Cap/Edge Water Narrow Oil Rims

GE Lizhen; LI Ao; MENG Zhiqiang; XIAO Peng; ZHU Xiaolin

doi:10.11911/syztjs.2018152

Volume 47 Issue 1

Jan. 2019

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Petroleum Drilling Techniques > 2019 > 47(1): 90-95. > DOI: 10.11911/syztjs.2018152

GE Lizhen, LI Ao, MENG Zhiqiang, XIAO Peng, ZHU Xiaolin. Experimental Study on the Draw-Down Pressure Control of Horizontal Wells with Gas-Cap/Edge Water Narrow Oil Rims[J]. Petroleum Drilling Techniques, 2019, 47(1): 90-95. DOI: 10.11911/syztjs.2018152

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Experimental Study on the Draw-Down Pressure Control of Horizontal Wells with Gas-Cap/Edge Water Narrow Oil Rims

1.
Tianjin Branch of CNOOC (China) Co., Ltd., Tianjin, 300459, China
2.
College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, 102249, China
3.
CNOOC Research Institute, Beijing,100028, China

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Received Date: June 25, 2018
Revised Date: September 27, 2018
Available Online: November 27, 2018

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Abstract

Abstract

To better understand the influence of draw-down pressure control strategy on the development result of gas-cap/edge water narrow oil rim, and to improve the recovery percentage of such reservoirs, a large-scale three-dimensional physical model was designed by taking an offshore gas-cap/edge water narrow oil rim as the prototype on the basis of similarity criteria. Production experiments on the different adjustment timing and adjustment modes of horizontal well draw-down pressure were conducted, and the influence of those adjustments on the development results of gas- cap/edge water narrow oil rim was analyzed. The results showed that the draw-down pressure increased after gas channeling in the horizontal wells, and the recovery percentage increased from 28.32% to about 40.00%. When gas channeling lasts for a period of time, the recovery percentage from draw-down pressure increase was better than that when gas channeling occurs instantly, and the recovery percentage can increase by 2.09%; In addition, the development result from draw-down pressure increase in single step mode is better than that in multi-step mode, and the recovery percent can increase by 2.47%. The research results showed that draw-down pressure increase in single step after gas channeling lasts for a period of time is the best strategy to improve the recovery percentage of this type of reservoir. This pressure draw-down adjustment strategy has been applied in an offshore gas-cap/edge water narrow oil rim, and oil production increase is remarkable.
- gas-cap oil reservoirs,
- edge water,
- oil ring,
- horizontal well,
- production differential pressure,
- recovery percent,
- physical analog,
- laboratory testing

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