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Filter drilling fluids

Acrylamide polymers are used as multipurpose additives in the oil-producing industry. Introduction of polymers into drilling fluids-drilling muds improves the rheological properties of the fluids in question, positively affects the size of suspended particles, and adds to filterability of well preparation to operation. Another important function is soil structure formation, which imparts additional strength to the well walls. A positive effect is also observed in secondary oil production, where acrylamide polymers additives improve the mobility of aqueous brines injections, which contribute to... [Pg.71]

The filtered phase and suspended particulate phase of the 1 9 slurry represent the 100% concentration or 1,000,000 ppm. Serial dilutions of these two phases of drilling fluids are used in the test procedure to expose mysid shrimp (Mysidopsis bahia) for 96 hr and determine the LC. ... [Pg.684]

Polyethercyclicpolyols possess enhanced molecular properties and characteristics and permit the preparation of enhanced drilling fluids that inhibit the formation of gas hydrates prevent shale dispersion and reduce the swelling of the formation to enhance wellbore stability, reduce fluid loss, and reduce filter-cake thickness. Drilling muds incorporating the polyethercyclicpolyols are substitutes for oil-based muds in many applications [195-197,1906,1907]. Polyethercyclicpolyols are prepared by thermally condensing a polyol, for example, glycerol to oligomers and cyclic ethers. [Pg.6]

Polyacrylates are often added to drilling fluids to increase viscosity and limit formation damage. The filter-cake is critical in preventing reservoir invasion by mud filtrate. Polymer invasion of the reservoir has been shown to have a great impact on permeability reduction [98]. The invasion of filtrate and solids in drilling in fluid can cause serious reservoir damage. [Pg.20]

Predictions on the effectiveness of a fluid loss additive formulation can be made on a laboratory scale by characterizing the properties of the filter-cake formed by appropriate experiments. Most of the fluids containing fluid loss additives are thixotropic. Therefore the apparent viscosity will change when a shear stress in a vertical direction is applied, as is very normal in a circulating drilling fluid. For this reason, the results from static filtering experiments are expected to be different in comparison with dynamic experiments. [Pg.36]

The drill-in fluids are typically composed of either starch or cellulose polymers, xanthan polymer, and sized calcium carbonate or salt particulates. Insufficient degradation of the filter-cakes resulting from even these clean drill-in fluids can significantly impede the flow capacity at the wellbore wall. Partially dehydrated, gelled drilling fluid and filter-cake must be displaced from the wellbore annulus to achieve a successful primary cement job. [Pg.120]

J. Weaver, K. M. Ravi, L. S. Eoff, R. Gdanski, and J. M. Wilson. Drilling fluid and filter cake removal methods and compositions. Patent US 5501276, 1996. [Pg.475]

C. G. Zhang, M. B. Sun, W. G. Hou, and D. Sun. Study on function mechanism of filtration reducer the influence of fluid loss additive on electrical charge density of filter cake fines. Drilling Fluid Completion Fluid, 12(4) 1-5,1995. [Pg.480]

Oilfield drilling fluids, organic titanium compounds in, 25 133 Oilfield emulsions, colloid, 7 274t Oilfield hydraulic fracturing fluids, organic titanium compounds in, 25 133 Oil fields, lithium in, 15 124 Oil-field waters, lithium-bearing, 15 128 Oil filters, phenolic resins in, 18 790 Oil-furnace blacks, 4 762 manufacture, 4 780—785 Oil gas, 6 787... [Pg.643]

Use Drilling fluids, decolorizing oils, filter medium. [Pg.109]

Figure 33 shows the time dependence of the volume of static filtrate collected from a typical water-based drilling fluid. The initial volume collected at time f = 0 is termed the spurt loss and represents the uncontrolled flow of filtrate and fine solids into the filter medium the spurt loss continues until a filter cake forms on the surface of the filter medium. [Pg.511]

Figure 37 shows a schematic of the dynamic filtration of a drilling fluid. The drilling fluid is filtered across the filter medium at the pressure difference APfd while being subjected to flow (assumed laminar in the following discussion), which gives rise to a shear stress rc at the cake-fluid interface where the shear rate is yc. [Pg.516]

Figure 37. Schematic of dynamic filtration of drilling fluid against a filter medium. Figure 37. Schematic of dynamic filtration of drilling fluid against a filter medium.
Figure 42. Dependence of (a) limiting dynamic filtration rate (Q/d) and (b) inverse of filter cake thickness (l/hc) on shear rate of drilling fluid. (Muds 2 and 3 from reference 139 with Fordham and Ladva s data from reference 135.) Lines show least squares fit to data from muds 2 and 3. Figure 42. Dependence of (a) limiting dynamic filtration rate (Q/d) and (b) inverse of filter cake thickness (l/hc) on shear rate of drilling fluid. (Muds 2 and 3 from reference 139 with Fordham and Ladva s data from reference 135.) Lines show least squares fit to data from muds 2 and 3.
The dynamic filtration theory of Outmans (127) requires experimental terms such as particle-particle stresses, particle friction factors, and thickness of a shear zone within the filter cake that would be difficult to determine. However, the qualitative picture of dynamic filtration presented by Outmans, namely, irreversible adhesion of solid particles up to a certain thickness that is determined by the shear stress (or shear rate) at the surface of the cake, accords with the experiments of Fordham and co-workers (129,135). Once a filter cake has formed under dynamic conditions, it is difficult to remove it by subsequent changes in yc or vm. Figure 44 shows the effect of changes in the flow rate on cumulative filtrate volume. The limiting filtration rate obtained when the initial flow rate of the drilling fluid was 1.8 m3/h remained unaltered when the flow rate of the drilling fluid was increased to 7.0 m3/h in a step-... [Pg.521]

Figure 51. SEM micrographs of filter cake formed under static conditions from simple bentonite drilling fluid formulated with (a) water and (b) 0.18 M CaCl2. (Reproduced with permission from reference 145. Copyright 1988 Society of Petroleum Engineers.)... Figure 51. SEM micrographs of filter cake formed under static conditions from simple bentonite drilling fluid formulated with (a) water and (b) 0.18 M CaCl2. (Reproduced with permission from reference 145. Copyright 1988 Society of Petroleum Engineers.)...
The imbalance in the chemical potential of the water in the shale and drilling fluid results in a tendency for water to enter the shale. Equation 110 is applicable to both water- and oil-based drilling fluids. When fij = fjL sh equation 110 gives the well-known expression for the swelling pressure (Psh — P) between the shale and the drilling fluid. The permeability of shales is very low and the rate of filtration into the shale will be below the critical filtration rate (140) and no filter cake will form on the surface of the shale. [Pg.538]

Some attempts to use metallic salts and oxides as scavengers in oilfield waterfloods have resulted in the formation of undesirable solid and metallic sulfides. Metallic salt coatings on zeolite filter agents have been suggested as an alternative. The authors applied these methods on the waterflood systems only and not on the drilling fluid. Therefore, one cannot say for sure that the methods and chemicals used by them will be suitable for drilling fluids (especially the water-based products that create more corrosion problems) unless more research is done on the subject. [Pg.470]

Per se, with some beneficiations In the drilling fluids, absorbents and filters, cl s can be directly used without any processing or alteration. [Pg.113]


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See also in sourсe #XX -- [ Pg.513 , Pg.514 , Pg.515 ]




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