It is designed to create stable and adjustable underbalance at the bottomhole to induce flow during hydrodynamic studies (HDI) and bottomhole formation zone (BFZ) cleaning.
The design feature of the MJP series pumps is that the jet cartridge (nozzle and mixer) is located in the jet pump insert and can be replaced without lifting the tubing.
MJP series jet pumps allow:
- To induce flow from the reservoir in a wide range of underbalances in wells with static level up to 1800 m at injection pressure of working fluid not less than 200-220 atm (over 1800 m at injection pressure of working fluid more than 200-220 atm).
- Carry out hydromechanical perforation and development in 1 SPO (Descending and Lifting Operation);
- Carry out selective treatment of the bottom-hole zone of the formation when isolating untreated formations with two-packer, three-packer layouts;
- To influence the bottom-hole zone of the reservoir by physical impact (MDC – method of cyclic depressions-repressions, vibro-wave impact on depressions);
- Obtain hydrodynamic data prior to lifting the assembly out of the well (when the jet pump insert is removed);
- To pump with repression (squeeze) acidic compositions into the formation and after that to extract reaction products in time (using a sleeve in the casing that closes the tubing-tubing connection);
- Pressurize the production string and packer;
- Carry out hydrocarbon production and development (including installation in liners with diameters from 102 mm).
Table of application conditions of the jet pumps of the SNO series depending on the discharge pressure.
Pump unit pressure required for jet pump operation: Pna(CH) = Pna – Pna(Nst) – Ptren
Pna is the pressure of the pump unit at the wellhead;
Pna(Hst)** – pressure of the pump unit spent on lifting the liquid (compensation of static level);
Ptren is the pump unit pressure loss due to friction on the tubing.
All calculations can be reduced to the variables static level at the time of operation and U – ejection coefficient = current well flow rate divided by the working fluid flow rate (nozzle flow).
1. Model MJP-1-d
The jet pump is designed to create a stable and adjustable underbalance at the bottom of the well for the purpose of well development and oil production.
Features:
- Can be installed in shanks from 102 mm.
- The check valve prevents fluid absorption into the formation when the insert is changed by backwashing.
- It is possible to smoothly change the underbalance to the reservoir due to smooth change of the power unit operation mode;
- Increased MRP for GNO up to 2000 days, no moving wear parts;
- No negative (pressure drop) effect on the shank suspension;
- Two jet pump inserts are used to ensure a continuous extraction process (saving time for revision, recovery).
Operation diagrams MJP-1-d:
2. Model MJP-1
The jet pump is designed to create a stable and adjustable underbalance at the bottom of the well for the purpose of well development, well testing, production.
Features:
- Registration of the inflow profile is possible;
- Can be used for mining;
- Applicable at AHFP (special version);
- Suitable for gas condensate wells with excessive bottomhole pressure (special version).
Operation diagrams of MJP-1:
3. Model MJP-1-GRP
The jet pump is designed to create stable and adjustable underbalance at the well bottomhole for the purpose of well development after hydraulic fracturing for 1 SPO.
Features:
- The hull comes down on NKT-89;
- Injection through the annular space (proppant removal through tubing);
- Fracturing and mastering for 1 SPO.
Operation schemes of MJP-1-GRP:
