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Search low solid content: 4.3.3 Solids
...SPE 65000 High-Density Invert-Emulsion System with Very Low Solids Content to Drill ERD and HPHT Wells 11 Table n. 4 - Tests with Cesium Formate Formulation: g g Sy...300 200 100 6 3 G 0 /G 10 AV PV YP ES agent agent Synt. Paraffin A Ilmenite WA02 96 52 37 21 4 3 3/5 48 44 8 275 Synt. Paraffin B Ilmenite WA02 74 40 28 16 3.5 3 3/4 37 34 6 270 Measurements at 120 ...
...SPE 65000 High-Density Invert-Emulsion System with Very Low Solids Content to Drill ERD and HPHT Wells 13 Table n. 9 - Typical Properties of Two Different Weighting ...ighting 600 300 200 100 6 3 G 0 G 10 AV PV YP ES agent agent 2137/3 WA02 Ilmenite 96 52 37 21 4 3 3 5 48 44 8 275 2137/3 WA02 Barite 112 59 41 23 4 4 4 5 56 53 6 1000 Measurements at 120 F AHR 16h a...
...SPE 65000 High-Density Invert-Emulsion System with Very Low Solids Content to Drill ERD and HPHT Wells Luigi F. Nicora, SPE, Pierangelo Pirovano, SPE, Lamberti SpA, ...s the laboratory development of a new Low density (ECD) and high surge and swab pressures. To build Solids Oil Based Mud System (OBMS) with a very high mud with such high densities, the concentration of wei...y 35% v/v. Together as solid free oil based mud with very low viscosity at densities with the drill solids and the organophilic clay, the total amount up to 1.52 SG, especially suggested for Extended Reach ...
Abstract The paper describes the laboratory development of a new Low Solids Oil Based Mud System (OBMS) with a very high specific gravity (2.04 SG; 17 ppg) for high-temperature and high-pressure applications. The system can also be applicable as solid free oil based mud with very low viscosity at densities up to 1.52 SG, especially suggested for Extended Reach Drilling Wells. The main goals of the new system are:Optimization of fluid rheology by reduction of the solids contents in the mud. Temperature and system stability at 170°C. The objectives have been pursued in the following ways:by using a very heavy brine as the internal phase; by decreasing the oil / brine ratio; by using a weighting agent with higher density than barite. In this way, the amount of weighting solids which needs to be added can be drastically reduced to even below 22% v/v for a 2.04 SG mud, compared to 35% v/v as in traditional oil based muds. Also the PV values have been reduced from typically round 60 cP to even below 25 cP. The addition of new components to the system has lead to the need of a new emulsifier package, which has been optimized with the development of a primary emulsifier and a wetting agent based on innovative chemistries. Introduction Saga Petroleum discovered in 1997 a new high temperature high pressure (HTHP) field offshore Norway, the Kristin field. A total of three exploration wells have been drilled on the Kristin structure. The temperature in the reservoir is 175°C and the pressure 930 bar, requiring the use of drilling fluids with high temperature stability and high density (2.04 kg/l). The drilling of these wells has identified the need of developing a drilling fluid system with better rheological properties and improved temperature stability. Conventional oil based mud has been used in exploration drilling. In vertical wells the mud has behaved satisfactorily but, when drilling inclined hole, a lot of mud related problems occurred such as barite settling, high equivalent circulating density (ECD) and high surge and swab pressures. To build mud with such high densities, the concentration of weight material needs to be very high. In the wells drilled in the Kristin field the amount of barite was approximately 35% v/v. Together with the drill solids and the organophilic clay, the total amount of solids in the mud was reaching almost 40% v/v. This very high solids content makes it very difficult to achieve a good rheological profile of the mud. To develop the Kristin field for production several extended reach drilling (ERD) wells need to be drilled. Drilling of these wells cannot be done with this type of mud because of the high ECD, caused by the high rheology of the mud, which might fracture the formation and cause lost circulation problems. The development of a new oil based mud system, which gives far lower ECDs, is therefore essential to be able to drill the necessary wells. Invert emulsion fluids consist of a salt water solution dispersed into a continuous hydrophobic phase. This emulsion is stabilized by emulsifiers. The salt water phase has traditionally been a CaCl2-brine, often with lime added for alkalinity. The oil / water ratio is traditionally in the range of 65/45 - 85/15. The concentration of solids in the mud will often dictate the oil / water ratio. In solids laden muds the oil ratio must be high, to keep the solids oil wet and dispersed.
- Europe > Norway > Norwegian Sea (0.65)
- North America > United States > Texas (0.46)
- Energy > Oil & Gas > Upstream (1.00)
- Materials > Chemicals > Commodity Chemicals > Petrochemicals (0.68)
- Europe > Norway > Norwegian Sea > Halten Terrace > PL 199 > Block 6506/11 > Kristin Field > Tofte Formation (0.99)
- Europe > Norway > Norwegian Sea > Halten Terrace > PL 199 > Block 6506/11 > Kristin Field > Ile Formation (0.99)
- Europe > Norway > Norwegian Sea > Halten Terrace > PL 199 > Block 6506/11 > Kristin Field > Garn Formation (0.99)
- (9 more...)