Reza Hashemi, 76North Hills, NY

5439058, Aug 8, 1995

Mar 11, 1994

8/208744

Christophe A. Malbrel - New York NY
Reza Hashemi - Sea Cliff NY

Pall Corporation - East Hills NY

E21B 3706
E21B 4328

166300

A method of cleaning an oil or gas well includes mixing a caustic with a saline solution to precipitate hydroxide species from the saline solution and form a milky suspension. The suspension is contacted with contaminants in a well bore to entrap the contaminants. A polymeric flocculant is then mixed with the suspension in the well bore to aggregate the hydroxide species and the entrapped contaminants into flocs. The flocs are extremely strong and can withstand the highly turbulent flow existing in the well bore and can be readily flushed out of the well bore.

5664628, Sep 9, 1997

Dec 7, 1994

8/351658

Paul C. Koehler - Cortland NY
Stephen A. Geibel - Cortland NY
Michael B. Whitlock - Cortland NY
Reza Hashemi - Sea Cliff NY
Christophe A. Malbrel - New York NY

PALL Corporation - East Hills NY

E21B 4308

166369

A damage-resistant filter for use in subterranean wells has at least one layer of a filter medium, such as a sintered supported porous membrane, coaxially disposed about a perforated support member. The filter may also include a drainage layer disposed between the inner support member and the filter medium, and a protective covering, such as a perforated cage, surrounding the filter medium. The filter is particularly suitable for removal of sand and other particulates from fluids produced in a well.

5909773, Jun 8, 1999

Jun 18, 1997

8/878078

Paul C. Koehler - Cortland NY
Stephen A. Geibel - Cortland NY
Michael B. Whitlock - Cortland NY
Reza Hashemi - Sea Cliff NY
Christophe A. Malbrel - New York NY

Pall Corporation - East Hills NY

E21B 4310

166277

A damage-resistant filter for use in subterranean wells has at least one layer of a filter medium, such as a sintered supported porous membrane, coaxially disposed about a perforated support member. The filter may also include a drainage layer disposed between the inner support member and the filter medium, and a protective covering, such as a perforated cage, surrounding the filter medium. The filter is particularly suitable for removal of sand and other particulates from fluids produced in a well.

5458198, Oct 17, 1995

Aug 26, 1993

8/111927

Reza Hashemi - Sea Cliff NY
Christophe A. Malbrel - New York NY

Pall Corporation - East Hills NY

E21B 3700

166312

An oil or gas well cleaning method includes inserting tubing, such as a coiled tubing, into a well bore, for example, into a production pipe in a well bore. A cleaning fluid containing a flocculant is passed into the well and the flocculant in the cleaning fluid is mixed with solid particles in the well bore to flocculate the particles. The cleaning fluid and the flocculated particles are then removed from the well. In one embodiment, the cleaning fluid containing the flocculant is discharged from the lower end of the tubing into the well, and the cleaning fluid with the flocculated particles is removed from the well via the production pipe. Alternatively, the cleaning fluid containing the flocculant may be introduced into the well through the production pipe, and the cleaning fluid with the flocculated particles may be removed via the tubing. The flocculant may also serve as a friction reducer to reduce friction between the cleaning fluid, the solids, the production pipe, and the tubing.