Pressure curve characteristics for wells drilled in cave of fracture-cavity carbonate reservoirs

  • PANG Jungang ,
  • LU Tao ,
  • GUO Ji’an ,
  • LI Wenhou
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  • 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Jingzhou 434023, China; 2. PetroChina Jidong Oilfield Company, Tangshan 063200, China; 3. Tianjin Branch, CNOOC,Tianjin 300452, China)

Online published: 2012-04-20

Abstract

Drilling stem emptying, massive mud leakage and acidification transformation appeared during the drilling process of fracture-cavity reservoirs, which increased difficulties for reservoir well test interpretation if using triple porosity well test method. It has great actual significance to establish well test interpretation model for wells drilled in cave and carry out well test interpretation of this reservoir. Based on the double porositymodel, taking inner cave as an equipotential body whose internal pressure was equal everywhere, making outer fluid flow observe Darcy law, and according to cave mass conservation equation, a new well test interpretation model for wells drilled in cave was presented. Laplace transform and Stehfest reverse method were used to solve the model. The influences of cave storage ratio, size of cave, matrix interporosity flowcoefficient and fracture storage ratio on the bottom pressure were analyzed. And the double log curve for wells drilled in cave of fracture-cavity carbonate reservoirs was used to interpret the measured pressure of some well in TZ area. Good results have been obtained, and this research can provide theory guidance for fracture-cavity reservoirs well test interpretation.

Cite this article

PANG Jungang , LU Tao , GUO Ji’an , LI Wenhou . Pressure curve characteristics for wells drilled in cave of fracture-cavity carbonate reservoirs[J]. Lithologic Reservoirs, 2012 , 24(2) : 124 -128 . DOI: 10.3969/j.issn.1673-8926.2012.02.024

References

[1] 张希明.新疆塔河油田下奥陶统碳酸盐岩缝洞型油气藏特征[J].石油勘探与开发,2001,28(5):17-22.
[2] Liu X,Yang J,Li Z,et al. A new methodology on reservoir modeling in the fracture-cavity carbonate rock of Tahe Oilfield [R]. SPE104429,2006.
[3] 王曦莎,易小燕,陈青,等.缝洞型碳酸盐岩井间连通性研究———以S48 井区缝洞单元为例[J].岩性油气藏,2010,22(1):126-128.
[4] 滕团余,潘建国,张虎权,等.塔中地区碳酸盐岩储层综合预测技术分析[J].岩性油气藏,2010,22(4):14-18.
[5] 范昱,陈洪德,林良彪,等.黔南独山地区上石炭统大埔组碳酸盐岩储层特征研究[J].岩性油气藏,2010,22(增刊):37-43.
[6] 姚军,戴卫华,王子胜.变井筒储存的三重介质油藏试井解释方法研究[J].石油大学学报:自然科学版,2004,28(1):46-51.
[7] 常学军,姚军,戴卫华,等.裂缝和洞与井筒连通的三重介质油藏试井解释方法研究[J].水动力学研究与进展(A 辑),2004,19(3):339-346.
[8] 彭小龙,杜志敏,戚志林,等.多重介质渗流模型的适用性分析[J].石油天然气学报,2006,28(4):99-101.
[9] 张冬丽,李江龙,吴玉树.缝洞型油藏三重介质数值试井模型影响因素[J].西南石油大学学报:自然科学版,2010,32(6):113-119.
[10] 陆燕妮,邓勇,陈刚.塔河油田缝洞型底水油藏临界产量计算研究[J].岩性油气藏,2009,21(4):108-110.
[11] 郭康良,庄新兵,张文昌.凝析气藏管流与地层渗流耦合研究[J].岩性油气藏,2007,19(2):112-116.
[12] 张福祥,陈方方,彭建新,等.井打在大尺度溶洞内的缝洞型油藏试井模型[J].石油学报,2009,30(6):912-915.
[13] 程倩,熊伟,高树生.基岩-孤立溶洞不稳定窜流方程[J].特种油气藏,2009,16(3):53-54.
[14] 姚军,黄朝琴,王子胜,等.缝洞型油藏的离散缝洞网络流动数学模型[J].石油学报,2010,31(5):815-819.
[15] 彭朝阳,龙武,杜志敏,等.缝洞型油藏离散介质网络数值试井模型[J].西南石油大学学报:自然科学版,2010,32(6):125-127.
[16] 彭小龙,杜志敏,刘学利,等.大尺度溶洞裂缝型油藏试井新模型[J].西南石油大学学报:自然科学版,2008,30(2):74-77.
[17] 葛家理.油气层渗流力学[M].北京:石油工业出版社,1982.
[18] 孔祥言.高等渗流力学[M].合肥:中国科学技术大学出版社,1999.
[19] Stehfest H. Remark on algorithm 368: Numerical inversion of Laplace transforms[J]. Communications of ACM,1970,13(1):47-49.
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