Wells – Processes – Freeing stuck object – grappling or fishing in well
Patent
1983-03-31
1985-01-01
Suchfield, George A.
Wells
Processes
Freeing stuck object, grappling or fishing in well
175 65, E21B 3100
Patent
active
044911815
ABSTRACT:
A spotting fluid comprising an oily material containing a solid spotting agent, said solid spotting agent comprising at least 20 weight percent of said oily material and at least 32 pounds per barrel of said solid spotting agent, said solid spotting agent comprising substantially spherical particles having a specific gravity of at least 2.0, an average particle diameter below 212 microns, and a compressive strength of at least 5000 psi is used to free a differentially stuck drill string.
REFERENCES:
patent: 3216933 (1965-11-01), Park et al.
patent: 4063603 (1977-12-01), Rayborn
patent: 4068718 (1978-01-01), Cooke, Jr. et al.
patent: 4123367 (1978-10-01), Dodd
Outmans, "Spot Fluid Quickly to Free Differentially Stuck Pipe", The Oil and Gas Journal, (Jul. 15, 1974), pp. 65-68.
Adams, "How to Control Differential Pipe Sticking", Petroleum Engineer, (Sep., 1977), pp. 32, 34 and 40; (Oct., 1977), pp. 40, 44 and 46.
"Million-dollar Misunderstanding Catapults Salesman to President", Drill Bit, (Jul. 1982), pp. 68 and 69.
Krol, "Laboratory Evaluation of Stuck Pipe Fluid Effectiveness", SPE 10096, paper presented at 56th Annual Fall Tech. Conference of Society of Petroleum Engineers of AIME, San Antonio, Tex., Oct. 5-7, 1981, 13 pp.
Gulf Research and Development Co.
Suchfield George A.
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