Abstract
An accurate temperature profile of the multi-stage fractured horizontal well is the foundation of production profile interpretation using distributed temperature sensing. In this paper, an oil-water two-phase flow multi-stage fractured horizontal well temperature prediction model considering stress sensitivity effect and the Joule–Thomson effect is constructed. Based on the simulation calculation, the wellbore temperature variation under different formation parameters, water cuts, and fracture parameters is discussed. The wellbore temperature distribution in multistage fractured horizontal wells is affected by many factors. According to the principle of orthogonal experimental design, the difference between wellbore temperature and initial formation temperature is selected as the analysis condition. Sixteen groups of orthogonal experimental calculations are designed and conducted. By analyzing the experimental results, it is found that the fracture half-length, water production, and formation permeability are the main controlling factors of the wellbore temperature profile. Finally, the production profile of the well is determined by calculating the temperature profile of a tight oil well and fitting it to the measured data of distributed temperature sensing.
Highlights
The production profile of multistage fractured horizontal wells can be directly measured by the production logging instrument [2,3]
According to the mathematical model established in the previous section, the variation of the wellbore temperature profile is affected by multiple factors simultaneously [32]
The temperature prediction model for a multistage fractured horizontal well with stress sensitivity established in Section 2 predicts the temperature profile of a tight oil fractured horizontal well
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Establishing a coupled model considering reservoir and wellbore temperature, and relating the measured temperature to the downhole flow, is the crux of determining the wellbore temperature distribution in the multistage fractured horizontal well. Muradov [15] developed a steady-state temperature model for a horizontal well with single-phase flow in which microthermal effect of the wellbore was considered. Cao [20] proposed a thermo-hydraulic coupling mathematical model for simulating the production process of single-phase multistage hydraulic fracturing horizontal wells in a tight oil reservoir. In this paper, considering the stress sensitivity effect and the Joule–Thompson effect, a set of temperature profile prediction models for a multistage fractured horizontal well in a tight reservoir is established. The model is applied to interpret the DTS temperature profile of a multistage fractured horizontal well in the Junggar basin, and the production profile of the well is derived
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