多分支井三维势分布实验新方法

针对实际油藏开发中，井筒流动阻力对等压线分布影响认识不清的问题。开展了相应实验研究，研究中采用
改进的电模拟实验方法：测量了多分支井近井地带三维势分布；在井模型上焊接碳膜电阻模拟井筒流动阻力对等压线
分布的影响；测量了不同电解质溶液浓度下等压线分布变化。实验结果表明：分支井在近井空间内的等势面与井的形
状相似并呈弧面向外凸起；考虑井筒阻力时水平井等压线呈鸡蛋形而非椭圆形，井控面积减少，近井地带存在压降使
得等压线穿过井筒所在位置；低渗状态下分支井井控面积更大，各分支贡献更明显，有利于开采。对于研究实际条件
下，多分井的控制体积具有较高的指导意义。

A New Approach of 3D Potential Distribution Experiment for Multi-lateral Wells

The effects of wellbore flow resistance and permeability on equi-pressure contour distribution is unclear in reservoir
development，so the modified electrolytic simulation experiment was carried out. Nearwellbore 3-D potential distribution of
multi-lateral wells was measured；the effects of wellbore flow resistance and permeability on equipressure contour distribution
were studied with a film resistors well model and different concentration of the electrolyte respectively. The results show that
the equipotential surface was cambered outward convex，that the surface shape in the nearwellbore space was similar to well
architecture；that equipressure contours were egg-shaped rather than oval when considering the resistance of the wellbore,and
that the control area decreased. Since nearwellbore pressure drop existsed，the equipressure contours passed through the wellbore
location. The drainage area extended and each branch contributed more effectively in low permeability reservoirs. The
results will have a great significance in determining the drainage area of multi-lateral wells.