无供给溶洞弹性开采实验

熊 伟;刘玉祥;常宝华;高树生;张静楠

doi:10.3981/j.issn.1000-7857.2011.02.006

科技导报 >

2011 , Vol. 29 >Issue 11-02: 41 - 43

DOI: https://doi.org/10.3981/j.issn.1000-7857.2011.02.006

研究论文

无供给溶洞弹性开采实验

熊伟;刘玉祥;常宝华;高树生;张静楠

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1. 中国科学院渗流流体力学研究所，河北廊坊 065007 2. 中国石油勘探开发研究院廊坊分院，河北廊坊 065007

收稿日期: 2010-10-20

修回日期: 2010-12-19

网络出版日期: 2011-01-18

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Experimental Study of Elastic Minning in a Cave of No-supply Type

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Received date: 2010-10-20

Revised date: 2010-12-19

Online published: 2011-01-18

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摘要

大型溶洞是塔里木油田缝洞型储层的重要储集空间，其成因复杂，结构相对简单，分布极不规律，是构成复杂缝洞型油藏的一个基础。目前该类油藏的开采方式主要依靠弹性能量开采。为了研究溶洞弹性开采自喷期阶段的井底压力和产量的变化规律，本文对其进行了简单的理论分析，又进行了模拟油和高黏度原油的物理模拟实验，理论分析结果和模拟实验结果能够很好吻合。结果表明，井底压力随开采时间呈指数递减趋势，递减指数与井口产量控制和溶洞内油水体积比、压缩系数有关，油井产量随开采时间也呈指数递减趋势；累积产量与累积压降曲线呈直线关系，其斜率的物理意义是单位生产压差下的累计产液量，大小只与溶洞内油水体积比和压缩系数有关，由此可估算溶洞体积范围。

关键词： 溶洞; 缝洞型油藏; 弹性开采; 无供给

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熊伟;刘玉祥;常宝华;高树生;张静楠 . 无供给溶洞弹性开采实验[J]. 科技导报, 2011 , 29(11-02) : 41 -43 . DOI: 10.3981/j.issn.1000-7857.2011.02.006

Abstract

The large caves are important storage space in fractured reservoirs in Tarim oilfield. The formation mechanism of the caves is very complex, but their structure is relatively simple. The large caves are the foundations of a complex vuggy reservoir. Currently the main method of exploitation of such reservoirs is based on mining. In order to study the variation of the bottom hole pressure and the production rate under the elastic mining conditions, a simple theoretical analysis and some physical simulation experiments were conducted. The theoretical analysis and experimental simulations give consistent results, which indicates that the bottom hole pressure decreases exponentially. The exponent is related to the well head production control, oil and water volumes in the caves and compressibility. The oil well production also decreases exponentially with time, and the curve of the cumulative production vs. the cumulative drawdown pressure is linear. The slope can be interpreted as the cumulative fluid production per unit of pressure drawdown, which is only related with the oil and water volumes and compressibility, and by which the cave volume range can be estimated.

Key words： cave; fracture-vuggy reservoirs; elastic mining; no supply

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