Home>API standards>API RP 13B-2-2005 pdf free download

API RP 13B-2-2005 pdf free download

API RP 13B-2-2005 pdf free download.Recommended Practice for Field Testing of Oil-based Drilling Fluids. Heat (or cool) the sample to the selected temperature. Use intermittent or constant shear at 600 r/min to stir the sample while heating (or cooling) to obtain a uniform sample temperature. After the cup temperature reaches the selected temperature, immerse the thermometer into the sample and continue stirring until the sample reaches the selected temperature. Record the temperature of the sample. With the sleeve rotating at 600 r/min, wait for the viscometer dial reading to reach a steady value (the time required is dependent on the drilling fluid characteristics). Record the dial reading R 600 in pascals for 600 r/min. Reduce the rotor speed to 300 r/min and wait for the dial reading to reach steady value. Record the dial reading R 300 in pascals for 300 r/min. Stir the drilling fluid sample for 10 s at 600 r/min. Allow drilling fluid sample to stand undisturbed for 10 s. Slowly and steadily turn the hand-wheel in the appropriate direction to produce a positive dial reading. Record the maximum reading as the initial gel strength. For instruments having a 3 r/min speed, the maximum reading attained after starting rotation at 3 r/min is the initial gel strength. Record the initial gel strength (10-second gel) in pounds per 100 square feet. NOTE To convert the dial reading to pounds per 100 square feet: 1 Pa = 0,48 lb/100 ft 2 . Restir the drilling fluid sample at 600 r/min for 10 s and then allow the drilling fluid to stand undisturbed for 10 min. Repeat the measurements as in and report the maximum reading as the 10- minute gel in pascals (pounds per 100 square feet).
7 Filtration 7.1 Principle 7.1.1 Measurement of the filtration behaviour and the filter cake characteristics of an oil-based drilling fluid are fundamental to the treatment and control of a drilling fluid, as are the characteristics of the filtrate, such as the oil, water or emulsion content. 7.1.2 Filtration characteristics of an oil-based drilling fluid are affected by the quantity, type and size of solid particles and emulsified water in the drilling fluid, and by properties of the liquid phase. Interactions of these various components can be influenced by temperature and pressure. 7.1.3 Filtration tests are performed at ambient (low) temperature and at high-temperature conditions to provide data for comparison purposes. Two filtration procedures are given: one for testing up to 175 °C (350 °F) and one for testing from 175 °C (350 °F) to 230 °C (450 °F). Use only the filtration equipment and procedure specified for the temperature required. NOTE No low-temperature filtration test procedure for oil-based drilling fluids is specified herein, but it can be performed much like the water-based drilling fluid test provided in ISO 10414-1. 7.1.4 Either the 175 cm 3 , 250 cm 3 , or 500 cm 3 unit can be used for testing filtration up to and including 175 °C (350 °F). For testing above 175 °C (350 °F), only the 500 cm 3 unit shall be used. It shall be equipped with a thermocouple to measure the temperature of drilling fluid in the cell, and it shall use a porous filter media. 7.2 High temperature/high pressure test up to 175 °C (350 °F) 7.2.1 Apparatus a) High-temperature/high-pressure filter press, consisting of: 1) filter cell, to contain working pressures up to 9 000 kPa (1 300 psi) at temperature; 2) pressurized gas source, such as carbon dioxide or nitrogen, with regulators; NOTE Nitrogen is preferred. 3) heating system, to heat to 175 °C (350 °F);4) high-pressure filtrate collection vessel, maintained at proper back-pressure (see Table 2) to avoid flashing or evaporation of the filtrate; 5) filter cell, containing a thermometer well, fitted with a removable end, a filter-media support and with oil- resistant seals. NOTE Valve stems on each end of the cell can be opened or closed during the test. CAUTION Not all manufacturers’ equipment is capable of achieving the same temperatures and pressures. Rigid adherence to manufacturer’s recommendations as to sample volumes, temperatures and pressures is essential. Failure to do so could result in serious injury. Do not use nitrous oxide cartridges as pressure sources for HT/HP filtration. Under temperature and pressure, nitrous oxide can detonate in the presence of grease, oil or carbonaceous materials. Nitrous oxide cartridges shall be used only for Garrett gas train carbonate analysis (see annex I).

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