Tubing sand pump
Patent
·
OSTI ID:5357720
This patent describes cleanout equipment for cleaning debris from an oil well. It comprises a well bore extending far beneath the surface of the earth, casing in the bore, a tubing string in the casing, a derrick above ground over the well bore, hoisting means on the derrick connected to the tubing string from raising, lowering, and reciprocating the tubing string, and liquid in the well; a mandrel connection threadedly attached to the bottom of the tubing string, a hexagonal mandrel attached to the mandrel connection and slidingly telescoped through, a barrel top fitting having a hexagonal bore below a cylindrical bore, a barrel having a barrel bore, a double action swab reciprocatingly within the barrel bore mounted on a tubular swab holder, a knocker threadedly attached to the swab holder and the mandrel, thus attaching the swab to the mandrel, so that liquid may pass through the tubular swab holder, valve seat, and fluid passages into an annular space between the mandrel and barrel, a restricted passageway at the top of the barrel forming means for limiting the velocity of travel of the mandrel by the passage of liquid through the restricted passageway thereby preventing overload of too much debris, a tubular barrel transition threadedly attached to the bottom of the barrel, a tail pipe threadedly attached to the barrel transition, a tubular head holder threadedly attached to the tail pipe, a flap valve on the head holder, and a bottom head threadedly attached to the bottom of the head holder, the cross sectional area of the mandrel being about half the cross sectional area of the barrel bore, the cross sectional area of the restricted passage at the top of the barrel being about 1/10 the cross sectional area of the barrel bore, and the cross sectional area of the combined fluid passages through the knocker being less than about 1/10 the cross sectional area of the barrel bore.
- Assignee:
- NOV; NOV-92-028099; EDB-92-101134
- Patent Number(s):
- A; US 5095976
- Application Number:
- PPN: US 7-268804
- OSTI ID:
- 5357720
- Country of Publication:
- United States
- Language:
- English
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