Blended drilling fluid thinner
AssigneePhillips Petroleum Company
InventorBharat B. Patel
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Abstract
A blended additive composition, which is useful for thinning aqueous drilling fluids, is disclosed. The composition includes a first component selected from the group including: a modified tannin, a modified lignite and sodium lignosulfonate; a second component being a polymer prepared from acrylic acid; and a third component being a metal compound selected from the group of metals including iron, tin, chromium, manganese, titanium, aluminum and zinc.
Claims21
A composition suitable for use as an additive in drilling, completion or workover fluids, said composition including a blend of chemical components consisting of:
- a first component selected form the group including:
- (a) a modified tannin, selected from the group consisting of a causticized tannin, a sulfited tannin, a sulfoalkylated tannin, and combination thereof,
- (b) a lignite, and
- (c) a lignosulfonate:
- a second component comprising a polymer prepared using acrylic acid;
- and a third component comprising a metal compound wherein said metal is selected from the group of metals including iron, tin, manganese, titanium aluminum and zinc or combinations thereof.
An aqueous based composition for use as a drilling, completion or workover fluid comprising water and sufficient finely divided solids to form a filter cake on the wall of a well, to which there has been added a thinning improvement amount of a blend of chemical components, said blend consisting of:
- a first component selected from the group including:
- (a) a modified tannin, selected from the group consisting of a causticized tannin, a sulfited tannin, a sulfoalkylated tannin, and combinations thereof,
- (b) a lignite, and
- (c) a lignosulfonate;
- a second component comprising a polymer prepared using acrylic acid;
- and
- a third component comprising a metal compound wherein said metal is selected from the group of metals including iron, tin, manganese, titanium, aluminum and zinc.
A method of drilling a bore hole in the earth of the type wherein the bore hole is formed by drilling means using a hollow drill string penetrating the earth to the bottom of said bore hole comprising circulating a drilling fluid composition wherein said composition consisting of:
- a first component selected from the group including:
- (a) a modified tannin,
- (b) a lignite, and
- (c) a lignosulfonate:
- a second component comprising a polymer prepared using acrylic acid;
- and
- a third component comprising a metal compound wherein said metal is selected from the group of metals including iron, tin, manganese, titanium, aluminum and zinc;
- wherein said modified tannin is selected from the group consisting of a causticized tannin, a sulfited tannin, a sulfoalkylated tannin, and combinations thereof.
A method for producing a dry residue composition suitable for use as an additive in drilling, completion or workover fluids, said method comprising the following step performed in the sequence set forth:
- (a) blending effective amounts of the following components sufficient to form a liquid blend:
- (i) dissolved sodium lignosulfonate,
- (ii) a polymer prepared using acrylic acid, and
- (iii) a metal compound selected from the group of metals including iron, tin, manganese, titanium, aluminum and zinc or mixtures thereof;
- and
- (b) drying said liquid blend to form said dry residue composition.
Dependencies are inferred from the claim text.