Formation treatment
AssigneeBP Exploration Operating Company Limited
InventorsMark Shelton Aston, Ian Gray
Life of this patent
Estimating the term…
Abstract
Sand in unconsolidated subterranean formations causes problems in oil recovery, which can be overcome by a method of consolidating sand in a subterranean formation, which method comprises: (i) contacting said sand in a first location in the presence of water with a slurry in a liquid medium of cement of average particle size less than 10 microns to produce in said medium a mixture comprising sand, water and some of the cement, and a remainder comprising the rest of the cement, (ii) preferably separating from said location said remainder from said mixture, (iii) which mixture is allowed to set to give permeable consolidated sand.
Claims21
-15. (canceled)
A method of consolidating sand in a subterranean formation, which method comprises:
- (i) contacting said sand in a first location in the presence of water with a slurry in a liquid medium of cement of average particle size less than 10 microns to produce a mixture comprising sand, water and some of the cement such that the amount of cement in the mixture is 3-15% by weight of the slurry, and a remainder comprising the rest of the cement,
- (ii) separating from said location said remainder from said mixture by passing a fluid through said location to carry away said remainder comprising cement and to leave said mixture,
- (iii) which mixture sets to give permeable consolidated sand.
A method of consolidating sand in a subterranean formation which method comprises:
- (i) contacting said sand in a first location in the presence of water with a slurry in a liquid medium of cement of average particle size less than 10 microns in a concentration of 3-15% by weight to produce in said medium a mixture comprising sand, water and cement and
- (iii) setting said mixture to give a permeable consolidated sand.
A method of consolidating sand in a subterranean formation, which method comprises:
- (i) contacting said sand in a first location in the presence of water with a slurry in a liquid medium of cement of average particle size less than 10 microns to produce a mixture comprising sand, water and cement, the cement being present in the mixture in an amount between 3 and 15% by weight of the slurry;
- and
- (iii) allowing the mixture to set to give permeable consolidated sand.
Dependencies are inferred from the claim text.