API RP 11AR:2000(R2020) pdf download

API RP 11AR:2000(R2020) pdf download.Recommended Practice for Care and Use of Subsurface Pumps.
5.22.1 Advantages
a. The stationary barrel. bottom anchor pump is the first pump to consider in deep wells. l.ikc the traveling-barrel pump, it has the ndvantage of having the hyLirostatic whing pressure applied to the outside of the barrel without the desadsantage of the column loading on the plunger bowing the pui1 tube on the downstroke.
b, The stationary barrel, bottoni anchor pump is normally recommended for wells with low static fluid lesel. since the production tubing may be run in with only a ‘.heut perli%ated nipple or mud anchor below the seating nipple. Thus, if required. the standing salve of the pump nlay be less than two feet from the bottom of the well
c. The stationary barrel bottom anchor pump is superior to the traveling barrel. bottom anchor pump for low fluid level wells, because the fluid has only to puss the larger standing valve located immediately abuse the seating nipple in order to be pumped. The top anchor pump shares this advantage.
d The statianan barrel, bottom anchor pump is excellent tir gassy wells when run in conjunction with a good liquid ga.s separator or gas anchor. The shun rise required (or the fluid to pass the standing valvc and enter the pump minimi,cs the tendency to foam and thus reduce ethcicncy.
5.2.2.2 LImitations
a. It is not a good practice to run a staieinary-barrel. bottom- anchor pump in a sandy well because sand can settle in the annulus between the pump and the tubing and stick it tightly in the joint.
h. It also has the disadvantage on intermittent operation that sand or other foreign material can settle past the barrel rod guide and tin top of the pump plunger whcn the well is shut down, with the possibility of sticking the pump when it is put hack on production.
52.3 Stationary Barrel Top Anchor Pump (Figure 6)
52.3.1 Advantages
a. The top anchor pump is recommended in sandy wells where a bottom anchor pump may become sanded in and cause a stripping job. The amount of sand that can settle over the seating ring or lop cup is limited to a nsa.vimum of about three inches. since the fluid discharge from the guide cage keeps ii washed free above this point. In this respect, ii is even superior to the traveling barrel, bouoni anchor pump, since if a travel barrel pump is spaced too high. sand cian seuk around the pull tube up to the lowest point reached by the pull plug on the downs*ruke
b. The top anchor pump is specifically recommended in lowfluid-level gassy or foamy wells where it is particularly fluid being pumped A gas anchor should be run below the shoe on the tubing.
5.2,3.2 Limitations
a. The ouLsideof the pump b.rnel o(atop.rnchorpump isat suction pressure. Consequently. it is more subject to bursting or parting the barrel tube than a bottom anchor pump. Well depth and the possibility of fluid pound should be carefully considered bef.we running a top-anchored pump with a thin wall barrel. If the depth of the well is within the depth recum mendatiuns. a tup-anchor pump is a guod general purpose mstallatiun.
5.3 TO OBTAIN OPTiMUM PERFORMANCE
5.3.1 Pump Sumergence
The energy to fill a pump during the upstmke must be supplied by the well forniation, Therefore, it is essential the pump be installed as low in the well bore as possible to main- tarn minimum hack pressure on the fonnation. “Ihe pump intake should be placed below the perforations, or as close above them as possible.
5.3.2 Gas Separation
Gas pruduchon through the pump sesn,ly reduces pump cfll.icncy. Where gas interference is a problem. a properly designed gas separator should be installed as a part of the subsurface pumping assembly. Various styles arc asailabk with each having ments for particular well conditions. It is important to keep the back pressure on the annulus at the welihead at a minimum.
5.3.3 Installations Where Formation Sand Can Be a Problem
A pump will inherently have problems it sand is allowed to enteL Therefore, it is best to utili,e some method of sand control to prevent enuance of sand into the well bore. Gravel packs. screens, and chem.cai bonding agents are frequently Uscd br this purpose.
5.4 ALLOWABLE PUMP SETTING DEPTHS
The formulas for the dctennination of the maximum allowable pump setting depth (ASL)t arc presented in this section.