I. Research background
Some drilling fluid (especially drilling fluid treated with lime) could become thick or hard when remains in deep hot well in static state, which will hinder well drilling and well completion. In order to assess the performance of drilling fluid at high temperature, to expose samples to pressure in aging test before heating them at high temperature is the best way. Nitrogen or carbon dioxide could be used for pressurization to prevent boiling and evaporation of drilling fluid before the testing temperature is reached. Therefore, the project lays a basis for exploring the performance of drilling fluid in the aging test with temperature as high as 600℉ (316℃) and pressure as high as 2500 psi (17237 kPa).
Ultra-temperature pressure vessel is a specially designed vessel used for ultra-temperature roller oven. The vessel is mainly constructed of special alloy and is comprised of vessel, seal cover, seal ring, vessel cover, flange and protective housing.
The vessel could be used for static temperature exposure or in a dynamic mode in a roller oven. It enables samples to be subjected to temperatures higher than the boiling point of water and still be maintained in a liquid state.
1. Study the cation exchange reaction in the drilling fluid using the re-prepared drilling fluid.
2. Determine the stability of drilling fluid additives.
3. Evenly mix liquid or solid matters.
4. Degas fluid.
Ultra-temperature pressure vessel is constructed of special alloy and the special processing has great improved its corrosion resistance and pressure resistance. Its total volume is 500 mL and could contain as much as 350 mL of sample. The maximum experimental temperature could be 600℉ (316 ℃) and the maximum pressure could be 2500 psi (17237 kPa). It is used to assess the performance of drilling fluid or mud in a static or a dynamic ultra-temperature status.