Basf Se Corporation

Basf Construction Solutions Gmbh

Basf Construction Polymers Gmbh

Basf Canada

Andrea Assmann

Roland Reichenbach-Klinke

Christian E Spindler

Björn Langlotz

Oscar Lafuente Cerda

Jutta Karin Langlotz

Uwe Huber

Russell Giesbrecht

Christian Spindler

The use of gelatin-based copolymers containing at least one grafted side chain formed from ethylenically unsaturated compounds as an anti-accretion additive is proposed for water-based drilling fluids in the development, exploitation and completion of underground mineral oil and natural gas deposits and in deep wells. These copolymers are water-soluble and have good biodegradability.

Biodegradable anti-accretion additive for water-based drilling fluids

What is proposed is the use of a water-soluble hydrophobically associating copolymer as an additive in the development, exploitation and completion of underground mineral oil and natural gas deposits and in deep drillings, wherein the copolymer comprises (a) at least one monoethylenically unsaturated monomer (a) selected fromHC&#x2550;C(R)&#x2014;R&#x2014;O&#x2014;(&#x2014;CH&#x2014;CH&#x2014;O&#x2014;)&#x2014;(&#x2014;CH&#x2014;CH(R)&#x2014;O&#x2014;)&#x2014;R&#x2003;&#x2003;(I), and/orHC&#x2550;C(R)&#x2014;O&#x2014;(&#x2014;CH&#x2014;CH&#x2014;O&#x2014;)&#x2014;R&#x2003;&#x2003;(II),and (b) at least one monoethylenically unsaturated, hydrophilic monomer (b) different from monomer (a),wherein the copolymer is obtainable through copolymerization of the monomers (a) and (b) in the presence of at least one surfactant (c).

Use of hydrophobically associated copolymer as an additive in specific oilfield applications

A graft polymer mixture comprising a grafting base based on brown coal and/or polyphenol is proposed, which has, as a graft component, a copolymer consisting of one or more ethylenically unsaturated monomers different from one another and one or more polyamides different from one another. Typical grafting bases are brown coal, brown coal coke, lignite and brown coal derivatives and tannins. Suitable graft components are in particular vinyl-containing components and styrenes, which may also be present in sulphonated form. Natural polyamides, such as, for example, casein, gelatin and collagen, are suitable polyamide components. These graft polymers having a preferred molar mass&#x3e;5000 g/mol are suitable as a mixture, in particular in construction chemistry applications, and in the development, exploitation and completion of underground mineral oil and natural gas deposits, and in deep wells, since they have excellent salt and temperature stabilities and are simultaneously water-soluble and/or biodegradable.

Graft polymer mixture

A copolymer containing, as monomer components, a) at least one sulfonic acid-containing compound, b) at least one nitrogen-containing N-vinylamide, one acrylamide or methacrylamide and c) at least one bifunctional or higher-functional vinyl ether is proposed. These copolymers are suitable in particular as thixotropic agents, antisegregation agents and water retention agents and overall as an additive in cement-containing but also gypsum-based systems. Such copolymers having a molecular weight of &#x3e;40 000 g/mol can be used in particular as admixtures in the exploration of mineral oil and natural gas deposits.

Copolymer based on a sulfonic acid-containing compound

Growing community of inventors

Unterreit, Germany

Andrea Assmann