多分支水平井注采井网波及系数研究
Study on Sweep Efficiency of Well Pattern with Vertical Injector and Multilateral Horizontal Producer
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- 引用格式:
-
张连枝,程时清,付随艺,张,芳,霍明会.多分支水平井注采井网波及系数研究[J].天然气与石油,2013,31(2):0.doi:
.Study on Sweep Efficiency of Well Pattern with Vertical Injector and Multilateral Horizontal Producer[J].Natural Gas and Oil,2013,31(2):0.doi:
- DOI:
- 作者:
- 张连枝 程时清 付随艺 张 芳 霍明会
- 作者单位:
- 中国石油大学（北京）石油工程教育部重点实验室
- 关键词:
- 多分支水平井；井网；产能；波及系数
Multilateral horizontal well； Well pattern； Productivity； Sweep efficiency
- 摘要:
- 多分支水平井注采井网波及系数是评价水驱开发效果的一个重要参数，研究多分支水平井注采井网波及系数具有重要意义。将多分支水平井等价为半径扩大的直井，利用等值渗流阻力法，考虑非活塞式水驱油，将渗流区划分为三个阻力区，推导出多分支水平井与直井联合开采面积井网的产能公式和波及系数公式。对多分支水平井五点法面积井网情况下的波及系数随穿透比和分支个数的变化情况进行了研究。结果表明，随着穿透比的增加，见水时刻波及系数减小；随着分支个数的增加，见水时刻的波及系数增加。计算结果与数值模拟结果非常接近，具有较高的精度，能满足工程计算要求。
The sweep efficiency of multilateral horizontal well injection and production pattern is an important parameter of water flooding development effect assesses and its study is of great significance. Considering equivalent flow resistances and non-piston water flooding， a multilateral horizontal well is equivalent to a vertical well with enlarged borehole， the seepage area is divided into three resistance zones and derived are the productivity formula and sweep efficiency of well pattern with vertical injector and multilateral horizontal producer. Analyzed is the variation of the sweep efficiency along with the ratio of the branch length to well spacing and branch numbers in the condition of five-spot well pattern of multilateral horizontal well. The analysis results show that the sweep efficiency decreases when the ratio of the branch length to the well spacing increases and the sweep efficiency increases when branch number increases， the calculation results， with very high accuracy， are very close to the numerical simulation results and can meet the engineering calculation requirements.
