Tag Archives: Junction Box

ESP submersible pumping system

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The ESP submersible pumping system consists of both downhole and surface components. The surface components are transformers, motor controllers, junction box and wellhead.

The wellhead accommodates the passage of the power cable from the surface to the wellbore.

The main down-hole components are the motor, seal, pump, and cable. Additional accessory equipment may include the gas separators, check and drain valves, cable bands and protectors, and downhole sensors.

Technologies, types, recommended practices and selection criteria of each compound of the ESP pumping system are discussed in the following list of 22 posts.

ESP Pump:

01- Submersible Pump System Overview

02- Centrifugal Pump ( ESP Pump)

03- ESP: Pump Stage

04- Pump impeller types

05- Pump Performance Curves – part 01

06- Pump Performance Curves – part 02

07- Pump Construction: Compression Pump vs. Floater Pump

08- Pump Shaft

Pump Intake:

09- Pump Intake

10- ESP Motor Shroud: Applications, Configurations and Selection Criteria

11- ESP: Gas handling device

Seal Section:

12- Motor Seal

ESP Motor:

13- ESP Motor

ESP Cable:

14- ESP Cable

15- Power losses in cables

16- Motor Lead Extension

17- ESP Power Cable Accessories

Motor Controller:

18- ESP Motor Switchboard

19- Variable Frequency Drive Basics

Transformer:

20- Introduction to transformer: How it works?

Wellhead Equipment:

21- Wellhead Equipment for ESP

Accessory Equipment:

22- ESP Accessory Equipment

ESP Accessory Equipment

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Junction box, Check and Drain Valves, Downhole Sensor and Centralizers are some kinds of  ESP Accessory Equipment. These type of equipment could play an important role to operate the ESP efficiently and maximize it run lifetime.

Junction Box:

The power cable coming from the well is connected to a surface electric cable leading to the switchboard. As seen in the figure below, the two cables are joined in the junction box, also called a “vent box”. The surface cable connects the junction box to the motor control panel and the motor control panel to the secondary side of the transformers.

It is a ventilated, weatherproof box performing the following three important functions:

  • Provides the electrical connection between the downhole and the surface electric cable.
  • Vents any gas to the atmosphere which might reach this point due to migration of well gases up the ESP power cable. The venting of gas eliminates the danger of fire or explosion that could happen if gases travel in the cable to the switchboard.
  • Acts as an easily accessible test point for electric checks of the downhole equipment.

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Submersible Pump System Overview

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The submersible pump system consists of both downhole and surface components. The main surface components are transformers, motor controllers, junction box and wellhead. The main downhole components are the motor, seal, pump and cable. Additional downhole components may be included to the system: data acquisition instrumentation, motor lead extension, cable bands and protectors, gas separator, check and drain valves.

The following video gives a quick equipment overview of the ESP submersible pumping system:

 

The following figure shows schematic diagram of a submersible pump installation:

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Step 8 – Downhole and Surface Accessory Equipment

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This article “Downhole and Surface Accessory Equipment” is the step 8 of the nine-step procedure to design an ESP with an efficient and cost-effective performance. The required downhole and surface accessory equipment are discussed and recommended practices are highlighted.

Downhole Accessory Equipment:

  • Motor Lead Extension (MLE):

API RP 11S4 defines the Motor Lead Extension as a “special power cable extending from the pothead on the motor to above the end of the pump where it connects with the power cable. A low-profile cable (flat configuration) is usually needed in this area due to limited clearance between the pump housing and the well casing”. It is recommended to select a length at least 6 ft. (1.8 m) longer than the upper end of the pump. The length of MLE has to be select in a way to avoid a splice over a tubing collar. Doing so could allow the cable to catch on the wellbore casing and damage the equipment.

  • Banding Cable Protectors:

Cable protectors are used to protect the Motor Lead Cables from damage during installation, operation and pulling. The figures below show an example of cable protectors.

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