Air Drilling in the Presence of Hydrocarbons: A Time for Pause

Malloy, Kenneth P.; Medley, George H.; Stone, Rick

doi:10.2523/108357-ms

Cited by 2 publications

(2 citation statements)

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“…For the purpose of simplified calculation, the chemical reactions among these combustible gases are ignored. The Le Chatelier rule is used to calculate the upper and lower limit of the gas mixture explosion [10,11] as follows:…”

Section: Calculation Of Explosive Rangementioning

confidence: 99%

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An Explosive Range Model Based on the Gas Composition, Temperature, and Pressure during Air Drilling

Fan

Zhang

et al. 2016

Mathematical Problems in Engineering

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Air drilling is low cost and effectively improves the penetration rate and causes minimal damage to liquid-sensitive pay zones. However, there is a potential downhole explosion when combustible gas mixed with drilling fluid reaches the combustible condition. In this paper, based on the underground combustion mechanism, an explosive range calculation model is established. This model couples the state equation and the empirical formula method, which considers the inert gas content, pressure, mixed gas component, and temperature. The result shows that increase of the inert gas content narrows the explosive range, while increase of the gas temperature and pressure improves the explosive range. A case in Chongqing, China, is used to validate the explosive range calculation model.

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Section: Calculation Of Explosive Rangementioning

confidence: 99%

“…Substituting the gas pressure and temperature obtained by using the above approach into (5), the state equation of the gas mixture underground or the single gas is obtained. Considering (11) and (12), the percentage of the individual gas can be calculated.…”

Section: Calculation Of Explosive Range Based On the Gas Statementioning

confidence: 99%

An Explosive Range Model Based on the Gas Composition, Temperature, and Pressure during Air Drilling

Fan

Zhang

et al. 2016

Mathematical Problems in Engineering

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Study on Reasonable Amount of Flushing Fluid and Flushing Time

Wang

Xiong

et al. 2020

Energies

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Oil-based drilling fluid has many advantages, such as stable performance, strong anti-pollution ability, and strong inhibition, and it has been widely used in the world. However, at present, there is no unified evaluation standard for the effect of flushing fluid under this condition, and most of them are based on the flushing effect evaluation of water-based drilling fluid. However, there are few studies on wetting reversal phenomenon, reasonable dosage, and flushing time between oil-based drilling fluid and flushing fluid on the two-phase interface. Therefore, it is necessary to establish a comprehensive evaluation method for the effect of flushing fluid under oil-based drilling fluid, and explore the relationship between the amount of flushing fluid and flushing efficiency, so as to determine the reasonable range of flushing fluid consumption. In this paper, using the existing experimental instruments, a type A oil-based flushing fluid commonly used in oil fields was selected for the experiment, and on the basis of the high-temperature and high-pressure filtration meter, a flushing fluid evaluation device was developed. Based on the principle of equal shear rate, the flushing displacement and flushing time were determined, and then the flushing effect was evaluated. In order to comprehensively consider the influencing factors of the well wall flushing effect, five experimental factors, including different core, flushing displacement, flushing time, flushing fluid type, and surfactant concentration, were selected to formulate the flushing experiment scheme. The contrast method was used to test the cementation strength of core and cement slurry under different conditions, and the microscopic morphology of the interface was observed and analyzed to explore the reasons for the change of cementation strength between core and cement slurry due to the existence of oil-based drilling fluid. The conclusion obtained has very important practical significance to guide the field practice.

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Air Drilling in the Presence of Hydrocarbons: A Time for Pause

Cited by 2 publications

References 0 publications

An Explosive Range Model Based on the Gas Composition, Temperature, and Pressure during Air Drilling

An Explosive Range Model Based on the Gas Composition, Temperature, and Pressure during Air Drilling

Study on Reasonable Amount of Flushing Fluid and Flushing Time

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