Kharrat, Mamdouh (2004) Study of Formation and Stability Conditions of Gas Hydrates in Drilling Fluids. PhD thesis Génie des Procédés, CENERG- Centre énergétique et procédés, ENSMP p.133.
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- Study of formation and stability conditions of gas hydrates in drilling fluids (deposited 21 February 2005)
- Study of Formation and Stability Conditions of Gas Hydrates in Drilling Fluids (deposited 29 June 2005) [Currently Displayed]
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Abstract
Drilling fluids are complex media, in which solid particles are in suspension in a water-in-oil emulsion. The formation
of gas hydrates in these fluids during off shore drilling operations has been suspected to be the cause of serious
accidents. The purpose of this thesis is the study of the formation conditions as well as the stability of gas hydrates in
complex fluids containing water-in-oil emulsions.
The technique of high-pressure differential scanning calorimetry was used to characterise the conditions of
hydrates formation and dissociation. Special attention has first been given to the validation of thermodynamic
measurements in homogeneous solutions, in the pressure range 4 to 12 Mpa; the results were found to be in good
agreement with literature data, as well as with modelling results. The method was then applied to water-in-oil
emulsion, used as a model for real drilling fluids. It was proven that thermodynamics of hydrate stability are not
significantly influenced by the state of dispersion of the water phase. On the other hand, the kinetics of formation and
the amount of hydrates formed are highly increased by the dispersion. Applying the technique to real drilling fluids
confirmed the results obtained in emulsions. Results interpretation allowed giving a representation of the process of
hydrate formation in emulsion.
Empirical modelling was developed to compute the stability limits of methane hydrate in the presence of
various inhibitors, at pressures ranging from ambient to 70 MPa. Isobaric phase diagrams were constructed, that allow
predicting the inhibiting efficiency of sodium chloride and calcium chloride at constant pressure, from 0,25 to 70 MPa.
| Item Type: | PhD Thesis (PhD) |
|---|---|
| Thesis Supervisor: | FÜrst, Walter |
| Date: | 26 October 2004 |
| Board of examiners: | Clausse, Danièle and Audibert-hayet, Annie and Cournil, Michel and Monfort, Jean-Pierre and Dalmazzone, Didier and FÜrst, Walter |
| Discipline: | Génie des Procédés |
| Collection (Fonds): | ENSTA ENSMP |
| Institution: | ENSMP |
| Department: | CENERG- Centre énergétique et procédés |
| Subjects: | 6. Chemistry, Physical Chemistry and Chemical Engineering 5. Fluid Mechanics and Energy |
| Uncontrolled Keywords: | Hydrate, Clathrate, Methane, Natural gas, Drilling fluids, Emulsion, Dsc, Thermodynamics, Hydrate, Clathrate, Méthane, Gaz naturel, Fluides de fora ge, émulsion, Dsc, Thermodynamique |
| ID Code: | 1073 |
|---|---|
| Deposited By: | Mamdouh Kharrat |
| Deposited On: | 29 June 2005 |
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