Wells – Processes – Cleaning or unloading well
Patent
1988-08-02
1990-05-01
Dang, Hoang C.
Wells
Processes
Cleaning or unloading well
166312, 166370, E21B 3700, E21B 2100
Patent
active
049215779
ABSTRACT:
A method and downhole well installation for facilitating the removal of detrimental material such as sand accumulated within a well penetrating a subterranean hydrocarbon formation. A tubing string in the well extends to a production interval open to the formation. A production stinger is slidably disposed in the tubing string and extends downwardly from the bottom of the tubing string into the production interval. A seal is provided between the stinger and the tubing string which permits slidable movement of the stinger but provides for a seal against fluid flow upwardly in the stinger-tubing string annulus. A longitudinal passage extends through the stinger and opens into the tubing string above the seal. At least one inflow opening to the longitudinal passage is provided in the stinger near the bottom thereof. Thus, when the stinger comes to rest upon the sand or other unwanted material accumulated in the well, the inflow opening is located adjacent the surface of the unwanted material. A pressure gradient is established through the inflow opening into the stinger passage. Fluid such as gas from the formation flows through the inflow opening into the longitudinal passage and entrains particulate material and carries it to the stinger passage to form a fluid stream containing entrained particulate material. The fluid-particulate material mixture passes upwardly through the stinger passage and into the tubing string above the seal.
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