Fluid loss additive for well drilling

Details Fluid loss additive for well drilling Fluid loss additive for well drilling

E - Fixed Constructions

21

B

31/21

E21B 33/138 (2006.01) C09K 8/502 (2006.01)

Patent

CA 1204280

ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the plugging of a porous formation which may be encountered during the drilling of a well. The process entails plugging of the porous formation by means of a polymeric solution containing pseudo-emulsion spheres. These particles penetrate the pore structure within a formation. Eventually, sufficient numbers of the spheres will accumulate within the pores, blocking further flow through the formation by both the pseudo- emulsion particles and any aqueous solutions. The pseudo-emulsion system is formed by a process which includes the steps of forming a solvent system of an organic liquid or oil and a polar cosolvent, the polar cosolvent being less than 15 weight percent of the solvent system, a viscosity of the solvent system being less than 100 cps; dissolving a neutralized sulfonated polymer in the solvent system to form a solution, a concentration of the neutralized sulfonated polymer in the solution being 0.01 to 0.5 weight percent, a viscosity of the solution being less than 200 cps; and admixing or contacting said solution with 5 to 500 volume percent water, the water being immiscible with the organic liquid and the polar cosolvent and neutral- ized sulfonated polymer transferring from the organic liquid to the water phase, thereby causing the water phase to gel (i.e. thicken).

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