Water-soluble polymers drilling fluids

In drilling fluids, water-soluble polymers can perform many functions, some of which are ... [Pg.200]

Copolymers of mainly acrylic acid and 2% to 20% by weight of itaconic acid are described as fluid loss additives for aqueous drilling fluids [138]. The polymers have an average molecular weight between 100,000 and 500,000 Dalton and are water dispersible. The polymers are advantageous when used with muds containing soluble calcium and muds containing chloride ions, such as seawater muds. [Pg.52]

Water-soluble polymers of allyloxybenzenesulfonate monomers can be used as dispersants in drilling fluids and in treating boiler waters in steamflooding and as plasticizers in cement slurries [1088,1089]. The preferable molecular weight range is 1000 to 500,000 Dalton. [Pg.311]

When suitably viscosified, TKPP solutions become superior low solids drilling fluids. Many water-soluble polymers were tested to identify satisfactory viscosifiers. Most commercially available polymers were found to be insoluble in TKPP solutions at densities above 11 ppg. Only xanthan gum... [Pg.627]

Water-Based Drilling Fluids. Water-based drilling fluids consist essentially of either a freshwater- or seawater-based fluid with a weighting agent (usually barite), bentonite clay and several water-soluble polymers, together with added salts (commonly NaCl, KCl) and sodium or potassium hydroxide for pH control. [Pg.465]

Water-Soluble Polymers. A number of water-soluble polymers are used extensively to control the rheological, fluid loss and shale stabilising properties of water-based drilling fluids. List I lists commonly used polymers and Figure 4 shows the structure of several polymer molecules. Several recent reviews of water-soluble polymers in drilling fluids are available (22-25) McCormick et al. (26) have given a recent useful introduction to water-soluble polymers. [Pg.468]

List I. Water-Soluble Polymers Used in Drilling Fluids... [Pg.469]

Figure 4. Some common water-soluble polymers used in water-based drilling fluids.

The temperature sensitivity of the polysaccharides, which is partly a consequence of the ether linkage in the backbone of the polymer (38), has lead to the increasing use of synthetic water-soluble polymers for high temperature drilling fluids. The use of synthetic polymers for fluid loss control in high temperature applications has been particularly im-... [Pg.470]

Ionics surfactants (which are mostly long-chain aliphatic salts) may be used in conjunction with polymers in oil-recovery procedures, and may be present along with water-soluble polymers in oil-drilling fluids and similar formulations. [Pg.198]

Water-soluble polymers have been reviewed with particular emphasis on their application in improved oil recovery. These polymers have potential for use in mobility control, drilling fluids and profile modification. Partially hydrolyzed polyacrylamide and xanthan gum are the most commonly used water-soluble polymers in oil field applications. The apparent viscosity of these polymers depend on polymer type, molecular weight, charge density, concentration, shear rate, salt concentration, and pH, as follows ... [Pg.660]

Jarm, V., Martinko, B. Kovac-Filipovic, M. (1988). Synthetic Water-Soluble Polymers as Aqueous Drilling Fluid Additives. Polimeri, Vol. 9, No. 11, (November 1988), pp. (276-278), ISSN 0351-1871... [Pg.146]

Acrylate and acrylamide polymers have several uses in drilling fluids, one of which is for filtration control. Sodium polyacrylates [9003-04-7] having molecular weights near 250,000 are exceUent temperature-stable filtration control agents for both fresh- and salt water muds, provided the concentration of water-soluble calcium is <400 mg/L (83). The calcium ions are precipitated using a carbonate such as soda ash, before adding the polyacrylate at concentrations up to ca 6 kg/m (3 Ib/bbl). [Pg.181]

Fluid loss additives such as solid particles and water-thickening polymers may be added to the drilling mud to reduce fluid loss from the well bore to the formation. Insoluble and partially soluble fluid loss additives include bentonite and other clays, starch from various sources, crushed walnut hulls, lignite treated with caustic or amines, resins of various types, gilsonite, benzoic acid flakes, and carefully sized particles of calcium borate, sodium borate, and mica. Soluble fluid loss additives include carboxymethyl cellulose (CMC), low molecular weight hydroxyethyl cellulose (HEC), carboxy-methYlhydroxyethyl cellulose (CMHEC), and sodium acrylate. A large number of water-soluble vinyl copolymers and terpolymers have been described as fluid loss additives for drilling and completion fluids in the patent literature. However, relatively few appear to be used in field operations. [Pg.10]

Acrylic acid can be used as comonomer in different copolymers. The most common of these are probably poly(ethylene-co-acrylic acid) (see Section 6.1, Figure 6.1.7), poly(acrylic acid-co-acrylamide), and poly(acrylic acid-co-styrene-co-acrylonitrile) or ASA terpolymer. The acrylic acid in the poly(ethylene-co-acrylic acid) increases the wettability of the polymer. Different salts of poly(acrylic acid-co-acrylamide) are used in the water purification processes as water clarification aid and in drilling fluids. Additional -COOH groups make the polymer even more hydrophilic, and polymers such as poly(acrylic acid-co-maleic acid) are easily water soluble and used as liquid thickeners. [Pg.358]