Study on Wellsite Toxic Gas Leakage and Dispersion of High Temperature High Pressure Gas Wells with High Sulfur Content

Abstract

During the drilling, completion and testing of gas well with high temperature, high pressure and high sulfur content, toxic gas leakage is dangerous and may bring severe consequences. It's important for the safety of personnel and assets to ascertain the leaking position and research the leakage characteristics. Focusing on the wellsite-scale space, this paper discussed the key position of leakage for different well procedures, and calculated the dispersion of leaked gas with the software FLUENT based on three dimension methods of computational fluid dynamics. Characteristics of toxic gas dispersion is discussed, and influence of wind speed, toxic gas components, leakage flowrate, temperature and wellsite obstacles is considered, which would help to optimize the monitoring locations. New proposal was put forward in simulation of multicomponent gas disperion on wellsite, as well as in explaination of toxic gas accumulation around obstacles.

Preparation and Characteristics of a pH Intelligent Response Blocking Agent for the Microcrack in the Cement Sheath

“…The primary function of cement sheath in oil and gas wells is to achieve interlayer isolation, prevent interlayer channeling, and ensure the safety of oil and gas production. 1,2 However, cement is a brittle material that is susceptible to damage from various harsh external environments encountered during its long-term service life, 3−5 including oil and gas well stimulation and injection, tectonic movement, fault slip, and formation fluid corrosion. 6−15 As a result, the cement sheath may develop microcracks, which can compromise the integrity of the cement sheath and lead to annulus crossflow.…”