[12] Patent
[11] Patent No.:GC0009738  
[45] Date of Publishing the Grant of the Patent: 28/Feb /2019                58/2019  
Number of the Decision to Grant the Patent:2019/145164
Date of the Decision to Grant the Patent:12/Feb/2019

[21] Application No.:GC 2016-31867

[22] Filing Date:16/8/2016

[30] Priority:

[33] State [32] Priority date [31] Priority No.

[72] Inventors:1- Pranjal Sarmah،2- Prahlad Kumar Yadav،3- Gaurav Agrawal،4- Tianping Huang

[73] Owner: Baker Hughes Incorporated, 2929 Allen Parkway, Suite 2100 , Houston, Texas 77019, USA

[74] Agent: Saba & Co. T.M.P




Int. Cl.: C09K 8/42, 8/48; E21B 33/13 (2006.01)

[56] Cited Documents:

-US 2009/0253596 A1 (HUANG TIANPING et al.) 08 October 2009
-US 2014/0246198 A1 (HALLIBURTON ENERGY SERVICES, INC.) 04September 2014
Examiner: Eng. Imad A. AlAhaidib

[57] Abstract: A formulation for use as a lost circulation preventive material is a cement-forming aqueous fluid comprising water, a viscoelastic surfactant (VES), a mono-valent or multivalent salt, a magnesium powder, a retarder, a weighting material, and a dispersant. The formulation is used in a method of drilling into a subterra-nean formation that includes introducing into a wellbore passing at least partially through the subterranean formation the cement-forming aqueous fluid, and fur-ther increasing the viscosity of the aqueous fluid with the VES; where the mono-valent salt is present in an amount effective to pseudo-crosslink the elongated VES micelles to further increase the viscosity of fluid. The formulation further forms a cement by reacting the magnesium powder and the water which reaction is retarded by the retarder. The water may be saline water. When the fluid density is greater than 14 pounds per gallon, a dispersant is required, such as a sulfonated copolymer.
No. of claims: 22     No. of figures: 8


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