Method of controlling porosity of well fluid blocking layers and

Details Method of controlling porosity of well fluid blocking layers and Method of controlling porosity of well fluid blocking layers and

1992-04-17

1993-06-29

Suchfield, George A.

Wells

Processes

Graveling or filter forming

166281, 166292, 166294, 166295, 252 8551, E21B 33138, E21B 4304

Patent

active

052225585

ABSTRACT:
A method of control of the porosity of wells with a fibrous fluid blocking layer disposed on formation faces is provided. By means of mineral fiber pellets of critical dimensions wherein the mineral fibers are highly soluble in acid, a fluid blocking layer formed of semi-dispersed pellets can bridge formation face pores subject to removal at will by acid treatment. Thus after well rework the plugging layer is treated by an acid solution after sealing the formation faces to prevent fluid losses to quickly dissolve the mineral fibers to the desired extent for control the porosity. A novel well workover product making the method possible is formed from raw material clinkers of highly acid soluble mineral fibers of between 5 to 15 microns in diameter by grinding in a hammermill into pellets of a range of 1/32 inch to 1/2 inch in diameter with an average being between 1/16 inch to 1/8 inch and with fiber lengths between 1/64 inch to 3/8 inch. The product has other uses in finishing wells, retaining sand geological formation faces and controlling hydraulic stress. Very little production is lost from a well reworked with this product after removal by acid treatment.

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