Open AccessAnnular Pressure-Volume Interaction Analysis for HPHT Well Based on Multi-scale
Author(s) -
Liyuan Cao,
Yihua Dou,
Kelin Wang,
Shuai Xue,
Hailong Geng
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1549/4/042125
Subject(s) - annulus (botany) , volume (thermodynamics) , mechanics , thermodynamics , exponential function , scale (ratio) , materials science , quadratic equation , physics , mathematics , composite material , geometry , mathematical analysis , quantum mechanics
Annulus pressure build-up is a potentially serious issue with high-pressure and high-temperature wells created by annuli which maybe heated up during production. Considering the mass conservation, energy conservation, and heat stability of fluid, the pressure-volume interaction models of multi-scale annulus are established based on PVT and the matrix of micro-annular temperature fields. Results indicate that the pressure-volume interaction moves the balance point of adjacent annulus early, which is a potentially serious issue for well integrity. The relationship between annulus temperature and pressure is linear. Moreover, at the same production, annulus pressure rapidly rises as the temperature increases, and the change rate of temperature increases at a negative exponential function. After the same production time, the relationship among temperature, pressure, and production is a quadratic function.