Research Papers: Petroleum Engineering

Performance Prediction of Gel Water Shutoff in Horizontal Wells Using a Newly Coupled Reservoir–Wellbore Model

[+] Author and Article Information
Chen Xianchao

China University of Petroleum (Huadong),
Qingdao 266580, China
e-mail: chenxianchao2005@126.com

Feng Qihong

China University of Petroleum (Huadong),
Qingdao 266580, China
e-mail: fengqihong@126.com

Wang Qiang

Research Institute of Petroleum
Exploration and Development,
CNPC, Beijing 100083, China
e-mail: wq401@petrochina.com.cn

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 21, 2013; final manuscript received February 15, 2014; published online April 9, 2014. Assoc. Editor: W. David Constant.

J. Energy Resour. Technol 136(2), 022903 (Apr 09, 2014) (7 pages) Paper No: JERT-13-1216; doi: 10.1115/1.4026919 History: Received July 21, 2013; Revised February 15, 2014

Water shutoff is a commonly used method to mitigate the early breakthrough in horizontal wells. Gel is frequently used as an effective water shutoff agent in mature fields, especially for horizontal wells in recent years. However, the relevant water shutoff prediction model lacks the accurate physical description of the gelation phenomenon. Using the conventional model, which simply accounts for the gelation mechanisms, does not allow us to predict the horizontal wells performance correctly. In this paper, a newly coupled reservoir–wellbore model for horizontal wells gel water shutoff prediction is presented. A conventional gel simulator is used to simulate the gel injection process in the reservoir and then modified to predict the horizontal well performance after the treatment. The time-varying residual resistance factor model and viscosity model is developed to simulate the gel degradation process. Especially, the wellbore pressure drop calculation takes account for the non-Newtonian behavior during and after the gel injection. An explicit modular coupled scheme, which consists of reservoir modular and wellbore modular, is adopted to numerically predict the horizontal wells performance. The newly presented method not only simulates the gel injection process but also predict the water shut off performance in horizontal wells. A field horizontal water shutoff case prediction shows that the coupled modeling method can give satisfactory results to guide the water shutoff treatment.

Copyright © 2014 by ASME
Topics: Water , Reservoirs
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Fig. 1

An illustration of the residual resistance factor variation model

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Fig. 2

An illustration of the gel viscosity variation model

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Fig. 3

Flow chart of the explicit coupled scheme

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Fig. 4

The comparison curves of oil rate between eclipse and new model

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Fig. 5

The comparison curves of oil production profile between eclipse and new model (200th day)

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Fig. 6

The permeability distribution along the horizontal wellbore TK117H

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Fig. 7

Vertical oil saturation contour section along horizontal wellbore on 500th day

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Fig. 8

Bottom hole pressure variation curve during the gel injection process

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Fig. 9

The water production profile variation after the water shutoff treatment

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Fig. 10

The production performance curve of the horizontal well

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Fig. 11

Vertical oil saturation contour comparison along horizontal wellbore on 900th day




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