缝洞型油藏钻遇溶洞油井的压力曲线特征

doi:10.3969/j.issn.1673-8926.2012.02.024

Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (2): 124-128.doi: 10.3969/j.issn.1673-8926.2012.02.024

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

LIU Hong¹， REN Lu²， HU Zhihua³

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:2012-04-20 Published:2012-04-20

Abstract

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.

Key words: lake shoreline, deep lake line, slope break zone, sand bodygenesis, Yanchangstage, OrdosBasin

LIU Hong， REN Lu， HU Zhihua. Pressure curve characteristics for wells drilled in cave of fracture-cavity carbonate reservoirs[J].Lithologic Reservoirs, 2012, 24(2): 124-128.

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