Particulate Weighting Agents Comprising Removable Coatings and Methods of Using the Same
First Claim
1. A method comprising the steps of:
- providing a treatment fluid for use in a subterranean formation, the treatment fluid comprising a coated particulate weighting agent comprising a core weighting agent having a first specific gravity and a removable polymer coating having a second specific gravity;
wherein the first specific gravity and the second specific gravity are not the same;
introducing the treatment fluid into the subterranean formation; and
allowing a portion of the removable polymer coating to be removed to alter the specific gravity of the coated particulate weighting agent down hole.
1 Assignment
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Accused Products
Abstract
Additives used in treatment fluids include particulate weighting agents comprising removable coatings which can be used in methods such as drilling and cementing operations; a method includes providing a treatment fluid for use in a subterranean formation, the treatment fluid including a coated particulate weighting agent including a core weighting agent having a first specific gravity and a removable polymer coating having a second specific gravity, the first specific gravity and the second specific gravity are not the same, introducing the treatment fluid into the subterranean formation, and allowing a portion of the removable polymer coating to be removed to alter the specific gravity of the coated particulate weighting agent down hole.
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Citations
21 Claims
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1. A method comprising the steps of:
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providing a treatment fluid for use in a subterranean formation, the treatment fluid comprising a coated particulate weighting agent comprising a core weighting agent having a first specific gravity and a removable polymer coating having a second specific gravity; wherein the first specific gravity and the second specific gravity are not the same; introducing the treatment fluid into the subterranean formation; and allowing a portion of the removable polymer coating to be removed to alter the specific gravity of the coated particulate weighting agent down hole. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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providing a treatment fluid for use in a subterranean formation comprising a weighting agent, the weighting agent comprising; a particulate metal oxide having a first specific gravity; and a polymer having a second specific gravity optionally covalently linked to the metal oxide particle; and introducing the treatment fluid into the subterranean formation; wherein the weighting agent is configured to prevent or reduce agglomeration and to allow at least a portion of the polymer to be removed to effect a change in specific gravity in the weighting agent down hole; and wherein the weighting agent is sized to prevent or reduce sag. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method comprising:
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providing a drilling fluid comprising a coated particulate weighting agent, the coated particulate weighting agent comprising, a particulate metal oxide and a polymer optionally covalently linked to the particulate metal oxide; and introducing the drilling fluid into a subterranean formation, wherein the weighting agent is configured to prevent or reduce agglomeration and to allow at least a portion of the polymer to be removed to effect a change in specific gravity in the weighting agent down hole; and wherein the weighting agent is sized to prevent or reduce sag.
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20. A method comprising:
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providing a cementing fluid comprising a coated particulate weighting agent, the coated particulate weighting agent comprising, a particulate metal oxide and a polymer optionally covalently linked to the particulate metal oxide; introducing the cementing fluid into a subterranean formation via a wellbore casing string; and allowing the cementing fluid to set to provide a set cement sheath, wherein the coated particulate weighting agent is configured to prevent or reduce agglomeration and to allow at least a portion of the polymer to be removed to effect a change in specific gravity in the weighting agent down hole; and wherein the weighting agent is sized to prevent or reduce sag.
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21. A method comprising the steps of:
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providing a treatment fluid for use in a subterranean formation, the treatment fluid comprising a coated particulate weighting agent comprising a core weighting agent having a first specific gravity and a removable coating having a second specific gravity; wherein the first specific gravity and the second specific gravity are not the same; introducing the treatment fluid into the subterranean formation; and allowing a portion of the removable coating to be removed to alter the specific gravity of the coated particulate weighting agent down hole.
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Specification