Electric simulation experiment procedure for predicting productivity of multi-stage fractured horizontal wells

Liu Changyin; Li Fengxia; Sun Zhiyu; Huang Zhiwen

doi:10.11743/ogg20170219

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Electric simulation experiment procedure for predicting productivity of multi-stage fractured horizontal wells
Vol. 38, Issue 2, Pages: 385-390(2017)
Online First：28 April 2017，

Published：2017
DOI： 10.11743/ogg20170219
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DOI：

Liu Changyin, Li Fengxia, Sun Zhiyu, et al. Electric simulation experiment procedure for predicting productivity of multi-stage fractured horizontal wells[J]. 2017, 38(2): 385-390. DOI： 10.11743/ogg20170219.

摘要

为了对水平井分段压裂产能影响因素进行模拟，研究了一种水平井分段压裂产能电模拟实验方法。首先，根据水平井分段压裂后的实际地层情况，模仿研制了一套三维电场模拟装置；然后，根据要模拟的砂体展布特征、油气藏的流动边界类型、水平井在砂体中的井眼轨迹、地层渗透率及地层厚度等，设置电模拟的电解液和电解池尺寸等，根据水平井长度、裂缝高度、裂缝长度、压裂段数、裂缝条数和缝间距等，设置模拟井筒及裂缝；最后，通过采集电流信号，以确定产能的大小。利用该实验方法分别开展了针对某河流相沉积砂体的水平井压裂裂缝形态及位置优化模拟、裂缝条数及间距优化模拟和不同地层厚度对比模拟实验，优化出的结论及参数为现场实施提供了技术支持。这种电模拟实验方法能够精确模拟水平井压裂完井的各项参数对产能的影响，对水平井压裂完井设计具有一定指导意义。

Abstract

An electric simulation experiment procedure for predicting productivity of multi-stage fractured horizontal wells was proposed in the paper.Firstly

we developed a 3D electric field simulator based on the actual situation of reservoirs after a multi-stage fracturing in a horizontal well.Secondly

we set up parameters for an electrolyte and an electrolytic cell based on sandbody distributions

flow boundary types of reservoirs

well bore trajectory in sandbodies

permeability and thickness of reservoirs and etc.We then input parameters of simulated wellbores and fractures in accordance to the length of a lateral

height and length of fractures

numbers of stages

numbers of fractures

spacing between fractures and so on.Finally

we gathered electronic signals to predict the productivity.The procedure was applied to a fluvial sandbody to optimize geometry and placement as well as numbers and spacing of fractures in laterals based on comparative simulation experiments in reservoirs of different thickness.The results provided technological support to field operation.The procedure with its accurate simulation of the influence of fracturing parameters upon productivity of wells may be used as gui-dance for the design of horizontal well fracturing and completion.