Composition and Method For Making a Proppant
First Claim
1. A proppant comprising a template sphere having at least one void within the interior of the template sphere and said template sphere having a Krumbein sphericity of at least about 0.3 and a roundness of at least about 0.1, said proppant having a Krumbein sphericity of at least about 0.5 and a roundness of at least about 0.4, and a continuous sintered shell around the entire outer surface of said template sphere, and wherein said shell comprises a ceramic material or oxide thereof and said template sphere comprises a material capable of withstanding sintering.
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Abstract
The present invention relates to proppants which can be used to prop open subterranean formation fractions. Proppant formulations are further disclosed which use one or more proppants of the present invention. Methods to prop open subterranean formation fractions are further disclosed. In addition, other uses for the proppants of the present invention are further disclosed, as well as methods of making the proppants.
147 Citations
145 Claims
- 1. A proppant comprising a template sphere having at least one void within the interior of the template sphere and said template sphere having a Krumbein sphericity of at least about 0.3 and a roundness of at least about 0.1, said proppant having a Krumbein sphericity of at least about 0.5 and a roundness of at least about 0.4, and a continuous sintered shell around the entire outer surface of said template sphere, and wherein said shell comprises a ceramic material or oxide thereof and said template sphere comprises a material capable of withstanding sintering.
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77. A method of forming a proppant, comprising providing a template sphere wherein said template sphere has one or more flaws on the surface of the template sphere;
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removing or diminishing said one or more flaws with one or more chemical treatments, one or more mechanical treatments, one or more thermal treatments, one or more spark discharge treatments, or any combination thereof; providing a shell around the entire outer surface of said template sphere after said removal or diminishing of one or more flaws, and then sintering said shell to form a continuous sintered shell. - View Dependent Claims (78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 97)
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- 92. A method of forming a proppant comprising providing a template sphere and forming a shell around the entire outer surface of said template sphere by a direct particle deposition from a slurry containing precursor particles that form the shell or coating and then drying or sintering said shell to form a continuous sintered shell.
- 94. A method of forming a proppant comprising providing a template sphere and forming a shell around the entire outer surface of said template sphere by direct nucleation and deposition of species onto the template sphere.
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98. A method of forming a sphere, comprising providing a template sphere wherein said template sphere has one or more flaws on the surface of the template sphere;
removing or diminishing said one or more flaws with one or more chemical treatments, one or more mechanical treatments, one or more thermal treatments, one or more spark discharge treatments, or any combination thereof. - View Dependent Claims (99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128)
- 141. A method of forming a reinforced template sphere comprising providing a template sphere and reinforcing around the outer surface of said template sphere by direct nucleation and deposition of species onto the template sphere.
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144. A method of forming a proppant comprising providing a template sphere having silica present and reacting a calcium containing species with said silica to form a calcium silicate phase on said template, and optionally coating said calcium silicate phase with at least one layer comprising a ceramic material.
Specification