低渗透油层有效动用的注采井距计算方法

新疆石油地质 ›› 2006, Vol. 27 ›› Issue (2): 216-218.

低渗透油层有效动用的注采井距计算方法

何贤科, 陈程

中国地质大学(北京) 能源学院, 北京 100083

收稿日期:2005-05-12 修回日期:2005-05-12 出版日期:2006-04-01 发布日期:2020-10-30
作者简介:何贤科(1982-) , 男, 浙江临海人, 在读硕士研究生, 油气田开发,(Tel) 010-82320858(E-mail) he_bob@sina.com.cn.

The Calculating Method for Effectively Producing Injection-Production Well Spacing of Low Permeability Reservoirs

HE Xian-ke, CHEN Cheng

Institute of Energy Resources, China University of Geosciences, Beijing 100083, China

Received:2005-05-12 Revised:2005-05-12 Online:2006-04-01 Published:2020-10-30

摘要/Abstract

摘要： 低渗透油田由于存在启动压力梯度, 开采难度很大, 确定合理注采井距对油田的经济、有效开发具有重要意义。利用渗流力学理论, 推导了不等产量下注采井之间的压力梯度分布公式, 可以确定在一定的注采条件下, 驱动压力梯度随井距的变化关系。渗流规律研究表明, 只有当驱动压力梯度完全克服油层启动压力梯度后注采关系才能建立, 因此, 克服最大启动压力梯度的最小驱动压力梯度所对应的注采井距即是油层能够动用的最大注采井距。通过以榆树林油田树322 区块为例, 结合启动压力梯度与渗透率的关系, 建立了最大注采井距与油层渗透率的关系。研究结果表明, 该油层能够有效动用的最大井距为242 m, 在目前300 m 井距下无法建立合理的注采关系, 这为油田下一步开发调整提供了科学的决策依据。

关键词: 低渗透油气藏, 井距, 压力梯度, 榆树林油田

Abstract: Determination of rational injection-production well spacing is significant for economic and effective exploitation of low permeability oilfield or reservoir due to existence of starting pressure gradient and recovery difficulty. Based on theory of fluid flow mechanics, the pressure gradient distribution equation between injector and producer under unequal production rate is deducted, by which the change of driving pressure gradient with well spacing under available injector-producer conditions can be determined. Study shows that such a relationship between injector and producer is not established until the driving pressure gradient completely overcomes the starting pressure gradient of reservoirs. Hence, the injection-production well spacing corresponding to the minimum driving pressure gradient in overcoming the maximum starting pressure gradient should be a proper maximum injection-production well spacing that the pay zone can be effectively produced. Well block Shu-322 in Yushulin oilfield is taken as an example integrated with starting pressure gradient and permeability, the relationship between the maximum injection-production well spacing and reservoir permeability is set up, showing that the effective producing maximum well spacing should be 242 m compared with 300 m available now. This is more reliable basis to be used for next-step modification of the oilfield development.

Key words: low permeability reservoir, well spacing, pressure gradient, Yushulin oilfield

中图分类号:

TE313.4

何贤科, 陈程. 低渗透油层有效动用的注采井距计算方法[J]. 新疆石油地质, 2006, 27(2): 216-218.

HE Xian-ke, CHEN Cheng. The Calculating Method for Effectively Producing Injection-Production Well Spacing of Low Permeability Reservoirs[J]. Xinjiang Petroleum Geology, 2006, 27(2): 216-218.

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