[12] Patent
[11] Patent No.:GC0004576  
[45] Date of Publishing the Grant of the Patent: 31/Dec /2016                32/2016  
Number of the Decision to Grant the Patent:2016/90294
Date of the Decision to Grant the Patent:28/Dec/2016

[21] Application No.:GCC/P/2007/9097

[22] Filing Date:17/9/2007

[30] Priority:

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

[72] Inventors:1- Richard D. Hutchins،2- Erik Nelson،3- Carlos Abad،4- Marie Noelle Dessinges

[73] Owner: Schlumberger Technology BV, Parkstraat 83-89, 2514 JG, The Hague, Netherlands

[74] Agent: Suleiman I. Al-Ammar Law Office




Int. Cl.: E21B43/267 ; C09K8/68 (2006.01)

[56] Cited Documents:

-US 5246602 A (FOREST G. T.) 21 September 1993  
Examiner: Eng. Ahmed Saleem AlHinai

[57] Abstract: Methods for treating a formation penetrated by a wellbore which improves fluid loss control during treatment. In some aspects, the treatments include preparing an aqueous fluid including one or more water inert polymers and an Optional viscosifier, injecting the aqueous fluid into the wellbore at a pressure equal to or greater than the formation’s fracture initiation pressure. The water inert polymer may be a polymer such as an emulsion polymer or a latex polymer. Some methods of the invention use a fluid which may have a normalized leak off coefficient (Cw/sqrt(K)) equal to or less than about 00022, 00014, or 00010. A conventional fluid loss additive may or may not be used in conjunction with the treatment fluid and/or the proppant laden fluid. The water inert polymer may or may not substantially enter formation pores. In another aspect, methods for reducing matrix damage to a formation during a treatment operation include preparing an aqueous treatment fluid formed of at least one water inert polymer, and injecting the fluid at a pressure equal or greater than the formation’s fracture initiation pressure.
No. of claims: 14     No. of figures: 11


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