barite sag problem
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- barite sag problem
Bern et al. (2000b) developed a simplified model based on empirical analysis to delineate the propensity of barite sagging tendencies for varied fluid types. The model was in good agreement with the Sag register model, a well-established model for sag analysis. The study indicated that sag was pronounced at 60 to 75 °.
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The results showed that adding 25/75 wt% Micromax/barite is enough to eliminate the sag issue in both vertical and 45° inclined position, as it enforced the sagging tendency to the safe range.
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The barite sag comes from barite, or other dense materials particles deposition resulted in undesired density fluctuations in drilling fluid can lead to mud loss, …
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Barite effect. For a drilling fluid density of 2.0 g/cu cm (16.7 lb/gal), 33% to 35% of drilling fluid volume is barite. At this high loading level, barite has a major impact on the rest of the drilling operation. But …
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Several wellbore problems that result from barite sag include fluctuation in torque and drag loads, difficulty in running of casing, displacement inefficiency during cementing operation, loss ...
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Abstract. Incidences with sag of solid weighting agents in drilling fluids can lead to potential drilling impediments including; loss of wellbore control, lost circulation, stuck pipe and high torque. The presence of sag has relatively often been the cause for gas kicks and oil-based drilling fluids are known to be more vulnerable for sag than water-based …
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As an example, both Halvorsen et al. [30] and Ofei et al. [31] found that increasing the density of the drilling fluid by adding barite yielded a monotonous increase in both yield stress and ...
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The new anti-sagging additive is an organophilic phyllosilicate (OP), which has a bulk density of 120 kg/m 3, a water content of less than 6%, and a specific weight ranging from 1.5 to 1.7 g/cm 3.Different amount of OP, ranging from 0.5 g to 2.0 g, were added to the drilling fluid and the properties of the drilling fluid were determined under …
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However, barite sag is often encountered because the completion fluid is required to be static for 7 to 15 days at a high temperature of more than 180°C, which results in serious problems, pipe ...
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Barite Application In Drilling Mud. Barite (barium sulfate, BaSO 4) contains 58.8 % barium and has a specific gravity of (4.2–4.5).The barite used in drilling fluid, which is normally impure, is of lower specific gravity as it contains other minerals such as quartz, chert, calcite, anhydrite, celestite, and various silicates.Also, it consists of other iron minerals, some of …
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Hanson et al.4 found that barite sag is most problematic under dynamic, not static, conditions. An important conclusion from this work was that barite sag generally observed in the field is primarily due to barite deposition occurring under dynamic conditions. Building upon this work Bern et al.5 induced barite sag by circulating at low
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Eq 1 YP (lb/100 sq ft) = Ɵ 300 – PV Eq 2 Viscosity should be measured and reported at standard tem-peratures which are usually 120°F for most wells or 150°F for high-temperature wells. Shear stress values should also be measured at other shear rates for improved accuracy when calculating pressure losses and when cleaning the hole. Typ-
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velocities, barite sag starts occurring and the difference in top and bottom mud density increases. This is further shown from the experimental data obtained from the study conducted by Nguyen et al.
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#2, and #3 the sag factor is below 0.51, indicating a very stable fluid that should not give static sag problems. Fluid #4, which was built with significantly less organophilic clay, exhibits a very high sag factor and visibly demonstrated barite sag in the lab. Table 1. Static sag performance of the four test fluids. Fluid #1 Fluid #2 Fluid #3 ...
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These results provide new insight into the mechanisms of barite sag and how best to manage problems in the field. Data from the tests clearly demonstrate that the …
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Improved Prediction of Barite Sag Using a Fluid Dynamics Approach. A Unique Technical Solution to Barite Sag in Drilling Fluids. Role of Rheology in Barite Sag in SBM and OBM. Challenging Wells. Case History: Zero Whole Mud Losses Achieved During Casing and Cementing Operations on Challenging Deepwater Well Drilled with Clay-Free Synthetic ...
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Effect of dynamic parameters on barite Sag. In the next stage, the effects of different parameters including flow rate and deviation angle were measured on the barite sag phenomenon (see Table 4).Mining into the results revealed that increasing the flow rate from 0.190 to 0.308 l/s, while the deviation angle and rotational speed were held constant …
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Overview. M-I BAR™ barite is a high-quality, drilling-grade barite used to increase the density of drilling fluids. This high-specific-gravity mineral is the most widely used weight barite and has applications in all drilling fluid systems, and meets API specifications for barite. M-I BAR is a mark of M-I L.L.C., an SLB company.
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Some of the problems associated with sag in the wellbore include pressure-control-related issues, fluctuation in torque and drag loads, difficulty in running of casing, displacement inefficiency during ... sag testing cell was developed to measure the level of barite sag at static and dynamic conditions with shear rates from 0.0 to 0.82 s 1 ...
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The change in the density of the 60/40 OBM and 80/20 OBM is 0.0888 sg, and 0.1887 sg, respectively. According to Maxey [66], the sagging potential of the drilling fluid is higher when the sag ...
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The section was drilled without problems, and there was negligible barite sag. This was not unanticipated, because the angle of deviation for this well was less than that of the other three cases.
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The synthetic clay was found to be effective in reducing the static and dynamic sag tendency of barite-weighted water-based drilling fluids. 0.75 lb/bbl of laponite was adequate to eliminate solid ...
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torque. The presence of sag has relatively often been the cause for gas kicks, and oil-based muds (OBM) are known to be more vulnerable for sag than WBMs 2. Barite sag is caused by the settling of suspended barite particles, which can lead to a variation in drilling fluid density 6. The study of barite sag mechanisms essentially plays a key role in
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Barite-weighted fluids are common for such purpose because of the good properties of barite, its low cost, and its availability. However, solids settlement is a major problem encountered with this type of fluids, especially at elevated downhole temperatures. This phenomenon is known as barite sag, and it
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Barite (BaSO 4) is a widespread mineral in deep-sea sediments, varying between 1% and 10% by weight on a carbonate-free basis.It is the predominant Ba phase in the ocean. BaSO 4 is known to compose a solid solution series with SrSO 4 as celestobarite in the skeletal portions of some marine organisms (i.e., the Xenophyophoria) and is often found in …
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This study introduces a combined barite-ilmenite weighting material to prevent the barite sag problem in water-based drilling fluid. Different drilling fluid samples were prepd. by adding different percentages of ilmenite (25, 50, and 75 wt.% from the total wt. of the weighting agent) to the base drilling fluid (barite-weighted).
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Barite Sag is a common phenomenon that occurs while drilling for oil and gas. Barite, BaSO4 is a weighing agent used to increase the density of drilling fluids to a desired level. ... This separation of barite from the aqueous phase creates an undesired density gradient and causes a lot of further problems. Barite sag can occur in both ...
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Summary. The occurrence of barite sag has been a well recognized but poorly understood phenomenon in the drilling industry resulting in problems such as lost circulation, well control and stuck pipe. The financial impact on drilling costs, usually resulting from rig-time lost while circulating and conditioning the drilling fluid system, is …
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understanding the problem itself may provide a solution that can prevent sag from occurring in the first place. To gain a fundamental understanding of this topic, it is useful to apply a ... AADE-13-FTCE-30 A Comprehensive approach to Barite Sag analysis on Field Muds 3 Table 4 – Field Sample 4 Properties Mud weight, ppg 17.5 OWR 80/20 Base ...
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