| 摘要 |
<p>Use of a microfibrillated cellulose containing one or more alkali metals (e.g. alkali metal ions) as, or as a component of, a drilling or completion fluid. Microfibrillated cellulose materials for use in the invention include compounds of formula I: [C6H7O2(OH)3-x ∙ (Q)x]n (I) wherein: C6H7O2(OH)3-x represents a microfibrillated cellulose unit; (Q)x either represents a modified hydroxyl group, or a group which replaces a hydroxyl group present in the cellulose unit, and which contains at least one alkali metal; x is an integer from 1 to 3 which indicates the number of hydroxyl groups in each cellulose unit which are either modified or replaced, and which may vary between different cellulose units; and n is an integer which corresponds to the total number of cellulose units. Also included are a drilling and completion fluid of the type described by formula 1, a method of drilling a well in the presence of said fluid and a method of making microfibrillated cellulose material. [No fig]</p> |
