Production performance analysis of fractured horizontal well in tight oil reservoir

Hongwen Luo,Jianfeng Zhang,Haitao Li,Junchao Wang,Xiaoping Zhu,Ke Wang,Tao Xia

doi:10.1007/s13202-017-0339-x

Abstract

As unconventional tight oil reservoirs are currently a superior focus on exploration and exploitation throughout the world, studies on production performance analysis of tight oil reservoirs appear to be meaningful. In this paper, on the basis of modern production analysis, a method to estimate dynamic reserve (OOIPSRV) for an individual multistage fractured horizontal well (MFHW) in tight oil reservoir has been proposed. A model using microseismic data has been developed to calculate fracturing network parameters: storativity (ω) and transmissivity ratio (λ). There main focuses of this study are in two aspects: (1) find out effective methods to estimate OOIPSRV for an individual MFHW in tight oil reservoir when there is only production data available and (2) study the relationship between productivity and fracturing network parameters (ω and λ) so as to estimate the productivity for individual MFHW from microseismic data. In order to demonstrate and verify the feasibility of developed methods and models, 5 filed wells and 2 simulated wells have been analyzed. The proposed method to calculate OOIPSRV proves to be applicable for MFHW in tight oil reservoirs. From the calculated results of ω and λ for example wells, it has been found that there exists linear relationship between the value of ω/λ and average production (Qave) for an individual MFHW completed in this actual tight oil reservoir. On the basis of derived linear relationship between ω/λ and Qave, the productivity for more individual MFHWs can be directly estimated according to microseismic interpretation.

Highlights

In order to achieve economical exploration, hydraulic fracturing stimulation has been widely used to enhance the production performance of tight reservoirs because of its low or ultra-low permeability (Bello and Wattenbarger 2010)
We demonstrate the availability of these two approaches in tight oil reservoirs, and we have introduced a solution to estimate OOIPSRV directly on the basis of Modern production analysis (MPA)
Taking Well 1 as an example, we have demonstrated how to identify the flow regimes for a fractured horizontal well completed in tight oil reservoir

Summary

Introduction

In order to achieve economical exploration, hydraulic fracturing stimulation has been widely used to enhance the production performance of tight reservoirs because of its low or ultra-low permeability (Bello and Wattenbarger 2010). On the basis of linear flow characteristic for MFHW in unconventional reservoirs, modern production analysis method (MPA) has been developed obtain reservoir parameters and perform flow regime identification (Cheng 2011; Song and EhligEconomides 2011; Clarkson 2013). Sander (1986) proposed a method to estimate the ratio of transmissivity (k) and storativity (x) from decline analysis using streamflow data that provides a useful reference when researchers are seeking for the relationship between productivity and fracturing network parameters. For the purpose of finding out the inside relationship between productivity and fracturing network parameters, a model has been developed to calculate x and k for an individual fracturing stage or for the whole MFHW in tight oil reservoir on the basis of microseismic data. It provides a method to estimate productivity directly from macroseismic data which is meaningful to be applied to more tight oil reservoirs

Methodology

Findings

Conclusions