Methods for pulling sucker rod strings

Details Methods for pulling sucker rod strings Methods for pulling sucker rod strings

1981-08-27

1983-12-27

Purser, Ernest R.

Wells

Processes

Destroying or dissolving well part

166377, E21B 1706, E21B 1916

Patent

active

044225083

ABSTRACT:
A method and means for pulling a sucker rod string from a well is disclosed. A separable connector is provided in the sucker rod string above the pump body. The connector comprises a male and a female section having aligned openings and joined by a shear pin within said openings. The force required to shear the pin and separate the sections of the connector is substantially greater than that required for normal operation of a downhole reciprocating pump or similar tool but is substantially less than the weight of the fluid column above the downhole reciprocating pump. The disclosed methods include insertion of this connector into a sucker rod string, such as one including fiberglass sucker rods, above the pump. The pump is then operated in the normal known fashion. To remove the sucker rod string, tension in the string is increased above that required to operate the pump until the pin within the connection shears, separating the sucker rod string from the pump. The sucker rod string may then be removed from the well and a parrafin scraper inserted therein to remove accumulated scale and parrafin from the inner wall of the tubing before the pump is fished out of the well. This invention prevents the pump from stripping the scale and parrafin from the tubing during the removal operation which may damage the pump or cause it to become stuck in the tubing. This also prevents the necessity of rotating a sucker rod string, particularly one including fiberglass sucker rods which have a low resistance to torque, to free a stuck pump.

REFERENCES:
patent: 2300711 (1942-11-01), Staerker
patent: 2889162 (1959-06-01), Norris
patent: 3486557 (1969-12-01), Harrison
patent: 3809162 (1974-05-01), Sydor

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