Disposable Downhole Tool

Abstract

A disposable downhole tool is disclosed. The tool is suitable for use as a frac tool. The tool includes a housing having an inner wall surface defining a bore. The tool also includes a valve structure disposed within the bore, the valve structure comprising a disposable plug seat, the disposable plug seat comprising a first natural material. The disposable tool may also include a disposable plug in fluid sealing engagement with the seat, the plug comprising a second natural material, the plug and the plug seat comprising a plug valve. The first and second natural materials may include sedimentary rock, such as various forms of limestone, including Carrara marble or Indiana limestone.

1 . A disposable downhole tool, comprising:
 a housing having an inner wall surface defining a bore;   a valve structure disposed within the bore, the valve structure comprising a disposable plug seat, the disposable plug seat comprising a first natural material.   
     
     
         2 . The disposable tool of  claim 1  further comprising a disposable plug in fluid sealing engagement with the seat, the plug comprising a second natural material, the plug and the plug seat comprising a plug valve. 
     
     
         3 . The disposable tool of  claim 2 , wherein the plug seat comprises a ball seat and the plug comprises a ball. 
     
     
         4 . The disposable tool of  claim 1 , wherein the first natural material comprises a sedimentary rock. 
     
     
         5 . The disposable tool of  claim 4 , wherein the sedimentary rock comprises limestone. 
     
     
         6 . The disposable tool of  claim 5 , wherein the limestone comprises calcite. 
     
     
         7 . The disposable tool of  claim 6 , wherein the first natural material comprises, by weight, at least 70 percent calcite. 
     
     
         8 . The disposable tool of  claim 4 , wherein the sedimentary rock comprises Carrara marble or Indiana limestone. 
     
     
         9 . The disposable tool of  claim 1 , wherein a surface of the natural material is treated with a sealer. 
     
     
         10 . The disposable tool of  claim 9 , wherein the sealer comprises a slurry comprising nanoparticles. 
     
     
         11 . The disposable tool of  claim 2 , wherein one of the first natural material or the second natural material comprises a sedimentary rock. 
     
     
         12 . The disposable tool of  claim 11 , wherein the sedimentary rock comprises limestone. 
     
     
         13 . The disposable tool of  claim 12 , wherein the limestone comprises calcite. 
     
     
         14 . The disposable tool of  claim 13 , wherein the first natural material comprises, by weight, at least 70 percent calcite. 
     
     
         15 . The disposable tool of  claim 11 , wherein the sedimentary rock comprises Carrara marble or Indiana limestone. 
     
     
         16 . The disposable tool of  claim 11 , wherein a surface of the first natural material or a surface of the second natural material is treated with a sealer. 
     
     
         17 . The disposable tool of  claim 16 , wherein the sealer comprises a slurry comprising nanoparticles. 
     
     
         18 . The disposable tool of  claim 1 , wherein the valve structure comprises a sleeve disposed within the bore. 
     
     
         19 . The disposable tool of  claim 1 , wherein the sleeve comprises a slidable sleeve. 
     
     
         20 . The disposable tool of  claim 19  further comprising a return member, the return member comprising a third natural material. 
     
     
         21 . The disposable tool of  claim 20 , wherein the third natural material comprises limestone. 
     
     
         22 . The disposable tool of  claim 2 , wherein the first natural material and the second natural material have a solubility greater than 70% in a dissolution fluid. 
     
     
         23 . The disposable tool of  claim 22 , wherein the dissolution fluid comprises an organic or inorganic acid. 
     
     
         24 . The disposable tool of  claim 23 , wherein the acid comprises a dicarboxylic acid. 
     
     
         25 . The disposable tool of  claim 24 , wherein the acid comprises dicarboxylic acid comprises oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, or a combination thereof. 
     
     
         26 . The disposable tool of  claim 23 , wherein the acid comprises hydrochloric acid, sulfuric acid, hydrofluoric acid, formic acid, acetic acid, fluoroboric acid, phosphoric acid, citric acid, sulfonic acid, glycolic acid, ethylenediaminetetraacetic acid (EDTA), disodium EDTA, hydroxyethylethylenediaminetriacetic acid, docosatetraenoic acid, nitrilotriacetic acid, hydroxyaminocarboxylic acid, diethylenetriaminepentaacetic acid, hydroxyethyliminodiacetic acid, polyaspartic acid, or a combination thereof. 
     
     
         27 . A disposable downhole tool, comprising:
 a disposable plug that is seatable against a disposable plug seat of a disposable valve structure, the disposable plug comprising a natural material.   
     
     
         28 . The disposable tool of  claim 28 , wherein the natural material comprises a sedimentary rock. 
     
     
         29 . The disposable tool of  claim 29 , wherein the sedimentary rock comprises limestone.