Method and apparatus for removal of pigs, deposits and other debris from pipelines and wellbores
A carrier assembly having at least one sealing cup, a fluid bypass and adjustable wash nozzles, as well as a spear assembly having a central through bore, are attached to the distal end of a length of continuous tubing and inserted in to the flow bore of a pipeline. Fluid is pumped through the annular space between the carrier assembly and the pipeline, providing motive force for advancing the carrier assembly within the pipeline. Fluid can bypass the carrier assembly, enter the central bore of the spear assembly, and return to the surface through the central bore of the continuous tubing. A stuck pig or other obstruction is speared, and thereafter retrieved from the pipeline on the continuous tubing.
1. An apparatus for removing obstructions from a pipeline comprising:
a body member having a flow bore extending therethrough and a flow bore outlet, and at least one flow channel having an inlet and an outlet disposed through said body member;
at least one sealing cup disposed on said body member between the inlet and outlet of said at least one flow channel, sealingly engaging the inner surface of said pipeline;
a nozzle on the outlet of said at least one flow channel;
a spear assembly having a first end, a second end and a spear assembly flow bore extending therethrough, wherein said first end is connected to said body member, said second end forms a point, and said spear assembly flow bore is in fluid communication with the flow bore;
a knuckle joint between the body member and the spear assembly; and
a check valve system having open and closed positions, disposed between said first and second ends of said spear assembly, said check valve system permitting fluid communication between the outer surface and the spear assembly flow bore when in an open position.
2. The apparatus of claim 1 , wherein said at least one sealing cup further comprises:
a rigid frame; and
at least one elastomer attached to said rigid frame.
3. The apparatus of claim 1 , further comprising a screen assembly disposed over the inlet of said at least one flow channel.
4. The apparatus of claim 1 , wherein said nozzle comprises an adjustable wash nozzle.
5. The apparatus of claim 1 , wherein said nozzle is oriented at an angle between 40 and 50 degrees relative to the inner surface of said pipeline.
6. The apparatus of claim 1 , further comprising at least one brush connected to the outer surface of said spear assembly.
7. A method for removing an obstruction from a pipeline comprising:
connecting an obstruction removal apparatus to a length of continuous tubing, said obstruction removal apparatus comprising:
a body member having a flow bore extending therethrough and a flow bore outlet, and at least one flow channel having an inlet and an outlet disposed through said body member;
at least one sealing cup disposed on said body member between the inlet and outlet of said at least one flow channel, sealingly engaging the inner surface of said pipeline;
a nozzle on the outlet of said at least one flow channel;
a spear assembly having a first end, a second end and a spear assembly flow bore extending therethrough, wherein said first end is connected to said body member, said second end is pointed, and said spear assembly flow bore is in fluid communication with the flow bore;
a knuckle joint between the body member and the spear assembly; and
a check valve system having open and closed positions, disposed between said first and second ends of said spear assembly, said check valve system permitting fluid communication between the outer surface and the spear assembly flow bore when in an open position;
conveying said obstruction removal apparatus into a pipeline;
gripping an obstruction; and
removing said obstruction from said pipeline.
8. The method of claim 7 , further comprising the step of pumping fluid into said pipeline.
9. The method of claim 8 , wherein said fluid is pumped into the annular space between said continuous tubing and pipeline, circulated through said obstruction removal apparatus, and recovered through said continuous tubing.
10. The method of claim 7 , wherein said at least one sealing cup further comprises:
a rigid frame; and
at least one elastomer attached to said rigid frame.
11. The method of claim 7 , wherein said obstruction removal apparatus further comprises a screen assembly disposed over the inlet of said at least one flow channel.
12. The method of claim 7 , wherein said nozzle comprises an adjustable wash nozzle.
13. The method of claim 7 , wherein said nozzle is oriented at an angle between 40 and 50 degrees relative to the inner surface of said pipeline.
14. The method of claim 7 , wherein said obstruction removal apparatus further comprises at least one brush connected to the outer surface of said spear assembly.