The Fuzzy Evaluation Based on Entropy Method for Heavy Oil Reservoir Horizontal Well CO2 Huff and Puff Well Selection

2014 ◽  
Vol 607 ◽  
pp. 886-893
Author(s):  
Ya Hui Li ◽  
Cai Zhen Peng
Keyword(s):  
Heavy Oil ◽  
Horizontal Well ◽  
Comprehensive Evaluation ◽  
Horizontal Wells ◽  
Fuzzy Comprehensive Evaluation ◽  
Indicator System ◽  
Entropy Method ◽  
Specific Method ◽  
Oil Reservoir ◽  
Heavy Oil Reservoir

Due to its high viscosity, it is very difficult to develop heavy oil cost-effectively. Currently, CO2 huff and puff method is a better choice to develop heavy oil reservoir. The key to this method is to choose the suitable candidate target wells. However, it is now very difficult to judge the suitability of the horizontal target wells’ heavy oil reservoirs’ CO2 huff and puff. In according to such issue, this paper, based on the entropy weight method of fuzzy comprehensive evaluation, and used the established horizontal wells’ index in heavy oil reservoir CO2 huff and puff, evaluates the suitability of candidate wells comprehensively. Moreover, this paper presents a set of indicator system that suits the choice of horizontal wells with regard to its heavy oil reservoir CO2 huff and puff, and proposes a specific method and procedures to evaluate an individual candidate well. This project uses such method to calculate 19 horizontal wells in area G, and the evaluation results are consistent with the actual situations. Therefore, it proves that such proposed evaluation method and evaluation index system are feasible to a certain extent. Keyword:heavy oil reservoir;horizontal well;CO2 huff and puff;Well selection; entropy method;Fuzzy comprehensive evaluation。

Impact of Rheology Models on Horizontal Well Polymer Flooding in a Heavy Oil Reservoir on Alaska North Slope: A Simulation Study

2021 ◽  
Author(s):  
Jianqiao Leng ◽  
Mingzhen Wei ◽  
Baojun Bai ◽  
Randall S. Seright ◽  
Yin Zhang ◽  
...  
Keyword(s):  
Bulk Viscosity ◽  
Simulation Study ◽  
Heavy Oil ◽  
Horizontal Well ◽  
Horizontal Wells ◽  
Polymer Flooding ◽  
North Slope ◽  
Oil Reservoir ◽  
Polymer Rheology ◽  
Heavy Oil Reservoir

Abstract Polymer rheology can have either a positive or a negative effect on polymer flooding performance under varied circumstances. Many researchers have studied the effect of polymer rheology in a vertical well, but no field scale studies have been conducted to investigate whether polymer rheology is beneficial to polymer flooding in heavy oil reservoirs developed by horizontal wells. In this paper, we conducted a numerical simulation study to examine the effect of HPAM polymer rheology on a polymer flooding pilot, which is the first-ever project conducted on a heavy oil reservoir from Alaska North Slope (ANS) developed by horizontal wells. Three rheology types were considered in the study including the apparent viscosity measured during coreflooding of using a HPAM polymer, the bulk viscosity measured with a viscometer, and a Newtonian flow model. The results suggest that using the bulk viscosity in simulation underestimates the conformance control and the water-oil-ratio reduction capability of the HPAM polymer solution. When the apparent viscosity is used, the incremental oil and sweep were largely increased, and the optimal recovery period of polymer flooding was extended greatly, especially for the heterogeneous formations. Therefore, the rheology type of polymer plays a significant role in the incremental oil recovery and injection profile of the horizontal well system given the pilot testconditions. This study has provided practical guidance to field operators for the ongoing polymer flooding pilot on ANS and will also provide valuable information for other polymer projects conducted in similar conditions.

scholarly journals CO 2 and viscosity breaker assisted steam huff and puff technology for horizontal wells in a super-heavy oil reservoir

2011 ◽  
Vol 38 (5) ◽  
pp. 600-605 ◽  
Author(s):  
Zhaomin Li ◽  
Teng Lu ◽  
Lei Tao ◽  
Binfei Li ◽  
Jiguo Zhang ◽  
...  
Keyword(s):  
Heavy Oil ◽  
Horizontal Wells ◽  
Oil Reservoir ◽  
Heavy Oil Reservoir

The Role of the Value of Information and Long Horizontal Wells in the Appraisal and Development Studies of a Brazilian Offshore Heavy Oil Reservoir

2005 ◽  
Author(s):  
Celso Cesar M. Branco ◽  
Antonio Carlos Capeleiro Pinto ◽  
Paulo Marcos Bastos Tinoco ◽  
Paulo Marcos F. Vieira ◽  
Alexandre Dutra Sayd ◽  
...  
Keyword(s):  
Heavy Oil ◽  
Value Of Information ◽  
Horizontal Wells ◽  
Oil Reservoir ◽  
Development Studies ◽  
Heavy Oil Reservoir

Study on Heating Zone and Producing Zone of Cyclic Steam Stimulation with Horizontal Well in Heavy Oil Reservoir

2012 ◽  
Vol 594-597 ◽  
pp. 2438-2441 ◽  
Author(s):  
Shi Jun Huang ◽  
Ping Hu ◽  
Qiu Li
Keyword(s):  
Heavy Oil ◽  
Horizontal Well ◽  
Thermal Recovery ◽  
Oil Reservoir ◽  
Heating Zone ◽  
Oil Viscosity ◽  
Cyclic Steam Stimulation ◽  
Heavy Oil Reservoir ◽  
Critical Viscosity ◽  
Steam Stimulation

In this paper, employing reservoir simulation and mathematical analysis methods, considering typical heavy oil reservoir and fluid thermal properties, the heating and producing shape of thermal recovery with horizontal well for different heavy oil reservoirs including ordinary, extra and super heavy oil are investigated based on the modification of thermal recovery parameters of different viscosity. By introducing heating radius and producing radius and considering the coupling effect of temperature, pressure and oil saturation fields, a quantitative expression between heating radius/producing radius and oil viscosity, formation thickness is presented, so is the impact of oil viscosity on the heating radius. Results shows that for Cyclic Steam Stimulation, the producing radius of horizontal well is bigger than its heating radius for light oil, both of which, however, shrink with higher viscosity. Beyond a critical viscosity, where the heating radius equals to the producing radius, the heating radius of horizontal well would be bigger than its producing radius. More over, the critical viscosity shows tight relationship to the formation thickness.

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