A Prediction of Water Breakthrough Time in Low Permeability Gas Reservoirs With Bottom Water

2011 ◽  
Author(s):  
Qinghui Zhang ◽  
XiangFang Li ◽  
Zhaojie Song ◽  
Bicheng Yan ◽  
Bangtang Yin ◽  
...  
Keyword(s):  
Bottom Water ◽  
Low Permeability ◽  
Breakthrough Time ◽  
Gas Reservoirs ◽  
Water Breakthrough

A Prediction of Water Breakthrough Time of Horizontal Wells in Gas Reservoirs with Bottom Water

2011 ◽  
Vol 201-203 ◽  
pp. 393-398
Author(s):  
Wei Yao Zhu ◽  
Xiao He Huang ◽  
Hong Qing Song ◽  
Jia Deng ◽  
Xuan Liu
Keyword(s):  
Bottom Water ◽  
Water Saturation ◽  
Horizontal Wells ◽  
Breakthrough Time ◽  
Gas Reservoirs ◽  
Gas Well ◽  
Porous Flow ◽  
Water Breakthrough ◽  
Irreducible Water Saturation

Based on the theory of porous flow, a study on prediction of water breakthrough time of horizontal wells in a homogeneous gas reservoir with bottom water is presented. This paper derives water breakthrough time formula of horizontal wells in a reservoir with bottom water drive. In the formula many factors are taken into account, such as height of water avoidance, gas-water mobility ratio, irreducible water saturation, residual gas saturation, etc. Case study indicates that for a horizontal gas well with constant production rate, the water breakthrough time is proportional to the height of water avoidance.

scholarly journals Prediction of water breakthrough time in horizontal Wells in edge water condensate gas reservoirs

2020 ◽  
Vol 213 ◽  
pp. 02009
Author(s):  
Quan Hua Huang ◽  
Xing Yu Lin
Keyword(s):  
Horizontal Well ◽  
Negative Impact ◽  
Horizontal Wells ◽  
Breakthrough Time ◽  
Gas Reservoirs ◽  
Gas Reservoir ◽  
Water Breakthrough ◽  
Calculation Results ◽  
Seepage Model ◽  
Reasonable Prediction

Horizontal Wells are often used to develop condensate gas reservoirs. When there is edge water in the gas reservoir, it will have a negative impact on the production of natural gas. Therefore, reasonable prediction of its water breakthrough time is of great significance for the efficient development of condensate gas reservoirs.At present, the prediction model of water breakthrough time in horizontal Wells of condensate gas reservoir is not perfect, and there are mainly problems such as incomplete consideration of retrograde condensate pollution and inaccurate determination of horizontal well seepage model. Based on the ellipsoidal horizontal well seepage model, considering the advance of edge water to the bottom of the well and condensate oil to formation, the advance of edge water is divided into two processes. The time when the first water molecule reaches the bottom of the well when the edge water tongue enters is deduced, that is, the time of edge water breakthrough in condensate gas reservoir.The calculation results show that the relative error of water breakthrough time considering retrograde condensate pollution is less than that without consideration, with a higher accuracy. The example error is less than 2%, which can be effectively applied to the development of edge water gas reservoir.

A Depletion Strategy for an Active Bottom-Water Drive Reservoir Using Analytical and Numerical Models—Field Case Study

2009 ◽  
Vol 131 (10) ◽  
Author(s):  
Ibrahim Sami Nashawi ◽  
Ealian H. Al-Anzi ◽  
Yousef S. Hashem
Keyword(s):  
Production Rate ◽  
Oil Recovery ◽  
Bottom Water ◽  
Numerical Models ◽  
Water Production ◽  
Breakthrough Time ◽  
Well Completion ◽  
Water Breakthrough ◽  
Water Coning ◽  
Single Well

Water coning is one of the most serious problems encountered in active bottom-water drive reservoir. It increases the cost of production operations, reduces the efficiency of the depletion mechanism, and decreases the overall oil recovery. Therefore, preventive measures to curtail water coning damaging effects should be well delineated at the early stages of reservoir depletion. Production rate, mobility ratio, well completion design, and reservoir anisotropy are few of the major parameters influencing and promoting water coning. The objective of this paper is to develop a depletion strategy for an active bottom-water drive reservoir that would improve oil recovery, reduce water production due to coning, delay water breakthrough time, and pre-identify wells that are candidates to excessive water production. The proposed depletion strategy does not only take into consideration the reservoir conditions, but also the currently available surface production facilities and future development plan. Analytical methods are first used to obtain preliminary estimates of critical production rate and water breakthrough time, then comprehensive numerical investigation of the relevant parameters affecting water coning behavior is conducted using a single well 3D radial reservoir simulation model.

Water Coning Simulation Mode in Fractured Gas Reservoir with Bottom Water

2013 ◽  
Vol 423-426 ◽  
pp. 1716-1721
Author(s):  
Xiao He Huang ◽  
Wei Yao Zhu ◽  
Yu Lou
Keyword(s):  
Bottom Water ◽  
Radial Flow ◽  
Gas Production ◽  
Breakthrough Time ◽  
Gas Reservoir ◽  
Water Breakthrough ◽  
Water Wells ◽  
Fracture Development ◽  
Flow Through

There are two percolation models, horizontal radial flow above perforation interval, and semispherical centripetal flow below perforation interval. Based on this models and the theory of percolation flow through porous media, a study on prediction of water breakthrough time in fractured gas reservoir with bottom water is presented. Through mathematical calculations, a formula to determine the time of water breakthrough in fractured gas reservoir with bottom water wells is derived. Case study indicates that water breakthrough time decreases with the fracture development index. With increase of perforated degree, water breakthrough time increase first and then decreased after a critical value, which could be considered as optimum perforation degree. If the perforated degree is fixed, the water breakthrough time is directly proportional to the thickness of the gas reservoir and inversely proportional to the gas production rate.

Theoretical Investigation of Factors Affecting Water Breakthrough Time in a Horizontal Well Subject to Bottom Water Drive

2013 ◽  
Vol 824 ◽  
pp. 394-400
Author(s):  
M.C. Ogbue ◽  
E. Steve Adewole
Keyword(s):  
Bottom Water ◽  
Radial Flow ◽  
Water Reservoir ◽  
Early Time ◽  
Late Time ◽  
Breakthrough Time ◽  
Factors Affecting ◽  
Vertical Permeability ◽  
Water Breakthrough ◽  
Time Linear

Water breakthrough marks end of economic life of a reservoir. It has negative influence on recovery, operations, and economics. This means that delaying the encroachment and production of water is a means of maximizing the ultimate oil recovery, operating at higher efficiency and maximizing profit. This theoretical research is aimed at solving for time water will breakthrough a horizontal well placed in bottom-water reservoir. And subsequently, suggest ways to delay the water breakthrough time. Thus the model herein is a repository of three aims of reservoir modeling; predict, optimize and monitor oil production. Well modifications strategies were suggested to achieve significant delay of water breakthrough. The well in a bottom-water reservoir, which is much longer than the well, experiences four flow regimes, namely, early-time radial flow, early-time linear flow, late time pseudo radial flow and late-time linear flow period within which water breakthrough occurred. Each flow regime was represented mathematically. The resulting integrals were evaluated numerically. From the mathematical model, factors affecting water breakthrough were chiefly wellbore, reservoir fluid and reservoir properties. Their effects are evident in computed dimensionlesss pressure,, end of early radial flow, tDe, and dimensionless flow time, tD. Water breakthrough was evidenced by constant PD value. Delayed water breakthrough is favoured by narrow well, shorter well, low viscous fluid, low flow rate and high horizontal permeability relative to vertical permeability. Viscosity of oil can be reduced by gaslifting, EOR thermal process, etc. Higher values of and tDe can be achieved by increasing the horizontal permeability,kh, while vertical permeability,kv, is reduced. Suitable stimulation process can achieve improved permeability.Special functionserf error function =Ei exponential integral function Ei(x) = [

scholarly journals Prediction Method of Bottom Water Coning Profile and Water Breakthrough Time in Bottom Water Reservoir without Barrier

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Yahui Li ◽  
Haitao Li ◽  
Ying Li
Keyword(s):  
Bottom Water ◽  
Radial Flow ◽  
Water Reservoir ◽  
Prediction Method ◽  
Flow In Porous Media ◽  
Fluid Viscosity ◽  
Breakthrough Time ◽  
Water Breakthrough ◽  
Irreducible Water Saturation ◽  
Water Coning

During the exploitation of bottom water oil reservoir, bottom water coning influences the breakthrough of bottom water significantly. Because water cut rises quickly after the breakthrough of bottom water, measures should be taken before the breakthrough to postpone production period without water, thus improving oil recovery. So accurate prediction of water coning profile and breakthrough time is very essential. Through mathematical derivation, this paper proposed a prediction method of bottom water coning profile and bottom water breakthrough time in bottom water reservoir without barrier. Based on theory of fluids flow in porous media, this paper assumes that the flow models are plane radial flow in opened intervals and spherical radial flow in unopened intervals. Further, factors of fluid viscosity, irreducible water saturation, residual oil saturation, and oil-water contact (OWC) movement are also taken into account. Compared with other prediction equations, this method achieves more precise bottom water breakthrough time, and the relative deviation is only 1.14 percent.

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