Calculation Method of Critical Control Value of Sustained Annular Pressure in Shale Gas Well

doi:10.11885/j.issn.1674-5086.2019.10.23.01

Abstract

Abstract: Large scale fracturing of shale gas wells leads to the destruction of well integrity, a sustained annulus pressure problems, seriously affecting the safe production of shale gas wells. Aiming at the problem of annular pressure in shale gas wells, based on the calculation method of critical control value of annular pressure in API RP 90-2, considering the factors such as formation pressure, production change, corrosion and wear of shale gas wells, the change of pressure bearing capacity of each annulus component with service time in actual production is analyzed, the calculation method of critical control value of sustained annular pressure and its control chart are established in this paper, and an example is given. The results show that the critical control value of annular pressure in shale gas well is mainly affected by the pressure bearing capacity of wellhead device and technical casing in the early stage of service. In the late stage of service, with the decrease of corrosion rate and formation pressure, it is mainly affected by the external extrusion strength of weak point of tubing, and it decreases with the increase of service time and corrosion rate. When the control value of annular pressure is less than formation pressure, it is necessary to monitor the sustained annulus pressure value and take corresponding measures to ensure the safety of production on site.

Key words: sustained annular pressure, wear, sustained annular pressure control, shale gas well, safety plate

CLC Number:

TE38

ZHANG Zhi, DING Jian, ZHAO Yuanjin, DENG Hu, LU Qi. Calculation Method of Critical Control Value of Sustained Annular Pressure in Shale Gas Well[J]. 西南石油大学学报(自然科学版), 2019, 41(6): 155-164.

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