They are designed to create a stable and adjustable underbalance at the bottomhole to induce flow during field geophysical (FGI), hydrodynamic studies (HDI) and physical stimulation of the bottomhole formation zone (BFZ).
The design feature of the JPR series pumps is that the jet cartridge (nozzle and mixer) is located in the jet pump casing and runs down the tubing.
JPR series jet pumps allow:
- Register inflow profile at adjustable underbalances (with set underbalance value) in wells with static level up to 900 meters. (at injection pressure of working fluid not less than 140 -160 atm, flow rate not less than 4 l/s);
- Influence the reservoir by hydrodynamic and physical methods in underbalanced modes;
- Physical stimulation of the bottom-hole zone of the reservoir (MDC – cyclic depression-repression method);
- Perform cumulative perforation on the depression (on the cable);
- Operate while injecting working fluid into tubing or interstitial tubing;
- Perform chemical and physical treatments and remove reaction products from BFZ;
- Clean the BFZ from penetration products of drilling and cement slurries;
- Record inflow profile with geophysical, fiber optic cable, CT;
Тable of conditions of application of jet pumps of JPR series at field-geophysical researches.
Pressure drop at the sealing unit of jet pump JPR-3 ΔPgu = ΔP+Pna+Pna(Hst) = ΔP+Pna(CH)+2Pna(Hst)
ΔR – depression on the reservoir;
Pna(Nst)** – pressure of pump unit spent on lifting of liquid static level;
Pna – working pressure of the pump unit when carrying out works with JPR-3 to record the inflow profile;
Rna(CH) – pump unit pressure spent on jet pump operation Rna(CH)=Rna-Rna(Nst);
The data in the tables are given to evaluate the possibility of geophysical cable movement through the sealing unit JPR-3 (taking into account 20 atm tubing injection pressure loss).
ΔPgu** = ΔP+Pna+Pna(Hst) < 240 atm
240 atm (over clamping the geophysical cable) when using the original JPR sealing assembly kit.
1. Model JPR-1mg
The jet pump is designed to create stable and adjustable underbalance at the bottomhole for well development in 102, 114 mm liners.
Features:
- The presence of a shutoff sleeve – allows fluids to be injected into the formation with excessive pressure (when the packer is seated);
- There are no adverse impacts to the PCZC;
- Easy to operate – start the pump in operation, with a ball;
- Work on tubing (special version of tubing).
Operation diagrams of JPR-1mg
2. Model JPR-2
The jet pump is designed to create a stable and adjustable underbalance at the bottom of the well for the purpose of development and field-geophysical studies.
Features:
- Simplified design – no special training is required to operate and maintain the jet pump;
- The presence of a shutoff sleeve – allows fluids to be injected into the formation with excessive pressure (when the packer is seated).
Operation diagrams of JPR-2
3. Model JPR-3
It is designed to create stable and adjustable underbalance at the well bottomhole to induce flow during development, field geophysical surveys (FGS) and physical stimulation of the reservoir using a cable.
Features:
- Possibility to conduct multi-cycle surveys alternating with chemical/physical treatments and field geophysical surveys (FGS) in 1 SPO;
- Static level operation up to 900 meters when injecting working fluid through tubing;
- Pump operation through tubing and in the annulus.
Operation diagrams of JPR-3
4. Model JPR-4 (2-89)
The jet pump is designed to create a stable and adjustable underbalance at the bottom of the well for the purpose of development and field-geophysical studies on rigid geophysical cable, coiled tubing.
Features:
- Installation of 2 jet pairs – ensures high productivity;
- It is possible to work on both CT and cable using a downhole tractor.
Operation diagrams of JPR-4 (2-89)
