Onland Oil Production Operation Downhole Pumps
Onland oil production operation downhole pumps Description
While there are only two main types of pumps standardized by API,
there are four different types of rod pumps. These are classified
by the type of barrel (standing or traveling) and where the pump is
anchored (top or bottom). API Spec. 11AX. shows the letter designations for the various types of rod and
tubing pumps that are available for different barrel thicknesses
and either metal or soft-packed plungers.
The complete pump designation of an API pump adds dimensional
diameters and lengths to the letter designations. This has been
modified in the latest revision to incorporate all approved sizes
and barrel types along with separating the extensions into the top
and bottom lengths, if required. The complete API designation
includes the following:
- Nominal tubing size (from 1.9- to 4.5-in. OD) - represented with 2
digits
- Basic bore diameter (from 1.0625 to 3.75 in.) - represented with 3
digits
- Type of pump (rod or tubing) - R or T to indicate type
- Type of barrel (heavy, thin, or X type) - single alpha character to
represent the barrel type
- Seating-assembly location (top or bottom) - A (for top), B (for
bottom), or T (for bottom, traveling barel)
- Type of seating assembly (cup or mechanical) - C or M to indicate
type
- Barrel length (ft) - single digit length
- Nominal plunger length (ft.) - single digit length
- Length (in.) of upper extension (if required)- single digit length
- Length (in.) of lower extension (if required)- single digit length
API Spec. 11AX. shows that, for example, a 1¼-in. bore-rod-type pump with a 10-ft
heavy-walled barrel, a 2-ft upper extension, a 2-ft lower
extension, a 4-ft plunger, and a bottom-cup-type seating assembly
that will be used in 2 3/8-in. tubing would be designated as
20-125-RHBC-10-4-2-2.
It is important to know that the users of API pumps need to
provide, along with the pump nomenclature, the following ordering
information: barrel and plunger material, plunger clearance (or fit
tolerance), and valve (ball and seat) and fittings material. The
materials normally available for each of these components also are
now included in the latest edition of API Spec. 11AX.
Technical parameter list:
| Model | Pump diameter (in) | Barrel length (ft) | Plunger length (ft) | Stroke length (ft) | Extension length (ft) | Tubing size EUE(in) |
| 30-250RWAM | Ø63.5 | 2.1-10 | 0.3-8.0 | 1.2-9.0 | / | 3-1/2” |
| 30-250RWBM |
| 30-250RWAC | Ø63.5 | 3-1/2" |
| 30-250RWBC |
Main parts process and material:
Pump barrel: plain carbon steel plating (A1), ordinary carbon steel
carbonitriding (B1), ordinary carbon steel carburizing (B2), low
alloy steel nitride (B5).
Plunger: 1045 steel spraying (B1), 1045 steel spraying (B2), 1045
steel chrome plating (A1), 1045 steel double chrome plating (A2).
Valve ball and seat: stainless steel (A1), cobalt chromium (B2),
tungsten carbide (C1), nickel and carbon compounds (C2), titanium
carbide (C3).
Other accessories: plain carbon steel, low alloy steel, stainless
steel, brass and other materials.
