Effect of acid-wormholing zone on deliverability of acid fracturing wells
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摘要: 针对酸压后蚓孔区影响油井产能问题,将酸压井的酸蚀蚓孔区考虑为双重介质系统,导出酸压井蚓孔区渗流模型。将蚓孔区双重介质渗流数学模型结合裂缝流动模型、地层线性流模型以及地层拟径向流模型求得各流动阶段井底压力解,从而建立了考虑蚓孔影响的酸压井产能公式。对各个渗流阶段无因次时间与无因次导流能力的分析结果表明,蚓孔区对低渗透油藏的酸压产能影响明显。研究结果为合理预测酸压井产能提供了一条可行途径。Abstract: The wormhole zone is considered as a dual-media system and a model is proposed by considering the effect of the wormhole. The bottomhole pressure can be solved by combining the mathematical model of flow through dual media with the fracture flow model, the linear flow in formation and the pseudo radial flow model. So a deliverability equation of acid fracturing wells considering the effect of wormhole is established. The dimensionless time and dimensionless flow conductivity of different flow stages are analyzed. The results show that the wormhole zone exerts great impact on the acid-fracturing deliverability of low-permeability reservoir.
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Key words:
- dual media /
- wormhole /
- acid fracturing well /
- flow conductivity /
- deliverability
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[1] [1]BUIJSC M A .Mechanisms of wormholing in carbonate acidizing[R].SPE 37283.
[2]CINCO-LEY F. Evaluation of hydraulic fracturing by transient pressure analysis method[R]. SPE 10043, 1982.
[3]LIAO Yizhu, and LEE W J. New solutions for wells well with finite-conductivity fractures including fracture-face skin: constant well pressure cases[R]. SPE 28605
[4]陈冀嵋,徐乐.考虑裂缝壁面蚓孔区影响的酸压井产能预测[J]. 天然气工业,2008,28(7):81-84.
CHEN Jimei, XU Le. Deliverability prediction of acid fracturing wells considering the effect of wormhole zone of fracture face[J]. Natural Gas Industry, 2008, 28(7): 81-84.
[5]Cinco-Ley. Evaluation of hydraulic fracturing by transient pressure analysis method[R]. SPE 10043, 1982.
[6]SCOTT J O. The effect of vertical fractures on transient pressure behavior of wells[J]. J. Pet. Tech. 1963-12: 1365-1369.
[7]RUSSELL D G, et al.Transient pressure behaviorin vertically fractured reservoir[J]. J. Pet. Tech. 1964-10: 1159-1170.
[8]GRINGARTEN A C. Applied pressure analysis for fractured wells[J]. J. P. T. July 1975: 887-892.
[9]CINCO-LEY H, Samaneigo-V F. Effect of wellbore storage and damage on the transient pressure behavior of vertical fractured wells[R]. SPE 6752.
[10]CINCO-LEY H. Transient pressure behavoir for a well with a finite-conductivity vertical fracture[J]. SPE, 1978: 253-264.
[11]CINCO-LEY H.Transiet pressure analysis: finte conductivity fracture case versus damaged fracture case [R]. SPE 10179.
[12]SHENG-TAI LEE: A new approximate analytic solution for finite-conductivity vertical fractures[J]. SPEF, 1986-02.
[13]刘慈群. 在双重孔隙介质中有限导流垂直裂缝井的非牛顿流体试井分析方法[J].石油学报,1990,11(4):61-67.
LIU Ciqun. A method for non-newtonian fluid well test analysis of finite conductivity vertical fracture wells in dual-porous media[J]. Acta Petrolei Sinica, 1990, 11(4): 61-67.
[14]刘曰武,刘慈群.无限导流垂直裂缝井的一种快速试井分析方法[J].大庆石油地质与开发,1993,12(4): 55-60.
LIU Yuewu, LIU Ciqun. A method for quick well test analysis of infinite conductivity vertical fracture wells[J]. Petroleum Geology & Oilfield Development in Daqing, 1993, 12(4): 55-60.
[15]AZARI M, WOODEN W O. Further investigation on the analytic solution for finite-conductivity vertical fracture[R]. SPE 21402.
[16]LIAO Yizhu, LEE W J. New solutions for wells well with finite-conductivity fractures including fracture-face skin: constant well pressure cases[R]. SPE 28605. [1]BUIJSC M A .Mechanisms of wormholing in carbonate acidizing[R].SPE 37283.
[2]CINCO-LEY F. Evaluation of hydraulic fracturing by transient pressure analysis method[R]. SPE 10043, 1982.
[3]LIAO Yizhu, and LEE W J. New solutions for wells well with finite-conductivity fractures including fracture-face skin: constant well pressure cases[R]. SPE 28605
[4]陈冀嵋,徐乐.考虑裂缝壁面蚓孔区影响的酸压井产能预测[J]. 天然气工业,2008,28(7):81-84.
CHEN Jimei, XU Le. Deliverability prediction of acid fracturing wells considering the effect of wormhole zone of fracture face[J]. Natural Gas Industry, 2008, 28(7): 81-84.
[5]Cinco-Ley. Evaluation of hydraulic fracturing by transient pressure analysis method[R]. SPE 10043, 1982.
[6]SCOTT J O. The effect of vertical fractures on transient pressure behavior of wells[J]. J. Pet. Tech. 1963-12: 1365-1369.
[7]RUSSELL D G, et al.Transient pressure behaviorin vertically fractured reservoir[J]. J. Pet. Tech. 1964-10: 1159-1170.
[8]GRINGARTEN A C. Applied pressure analysis for fractured wells[J]. J. P. T. July 1975: 887-892.
[9]CINCO-LEY H, Samaneigo-V F. Effect of wellbore storage and damage on the transient pressure behavior of vertical fractured wells[R]. SPE 6752.
[10]CINCO-LEY H. Transient pressure behavoir for a well with a finite-conductivity vertical fracture[J]. SPE, 1978: 253-264.
[11]CINCO-LEY H.Transiet pressure analysis: finte conductivity fracture case versus damaged fracture case [R]. SPE 10179.
[12]SHENG-TAI LEE: A new approximate analytic solution for finite-conductivity vertical fractures[J]. SPEF, 1986-02.
[13]刘慈群. 在双重孔隙介质中有限导流垂直裂缝井的非牛顿流体试井分析方法[J].石油学报,1990,11(4):61-67.
LIU Ciqun. A method for non-newtonian fluid well test analysis of finite conductivity vertical fracture wells in dual-porous media[J]. Acta Petrolei Sinica, 1990, 11(4): 61-67.
[14]刘曰武,刘慈群.无限导流垂直裂缝井的一种快速试井分析方法[J].大庆石油地质与开发,1993,12(4): 55-60.
LIU Yuewu, LIU Ciqun. A method for quick well test analysis of infinite conductivity vertical fracture wells[J]. Petroleum Geology & Oilfield Development in Daqing, 1993, 12(4): 55-60.
[15]AZARI M, WOODEN W O. Further investigation on the analytic solution for finite-conductivity vertical fracture[R]. SPE 21402.
[16]LIAO Yizhu, LEE W J. New solutions for wells well with finite-conductivity fractures including fracture-face skin: constant well pressure cases[R]. SPE 28605. -

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