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Place of Origin: | China |
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Brand Name: | MICH |
Certification: | ISO9001 |
Model Number: | OCRDHEHFI |
Minimum Order Quantity: | 1 piece |
Price: | USD20-USD200,000 |
Packaging Details: | plywood crates |
Delivery Time: | in one month |
Supply Ability: | As per the product output capacity |
Heating Element: | Mineral Insulated Heating Cable | Property: | Fluid Increasing |
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Function: | Viscosity Decreasing | Structure: | Horizontal Or Vertical |
Output: | 3-25 KW | Voltage: | 220, 380, 600 Etc |
Power Phases: | 2 Or 3 | Immersion Length: | Up To 6600 Mm |
High Light: | Fluid Increasing Mineral Insulated Heaters,220VAC Mineral Insulated Heaters,Down Hole Mineral Insulated Heaters |
Operation Cost Reduced Down Hole Electric Heater for Fluid Increasing
Operation Cost Reduced Down Hole Electric Heater for Fluid Increasing is a specially designed heating system for heavy oil extracting places to reduce the cost on production against other technical solutions such as heat oil etc. It can be designed to any operating voltage. The power transmission cable of the downhole electric heater (use the proven flat cable of the submersible pump)is used to transmit power and give off heat at a small power level reasonably along the outer wall of the oil pipe. Such a combination provides a real solution to the technical problems such as pump suction of the heavy bodied oils at the bottom of the oil well and the electric heating of the outer wall of the oil pipe.
1. Downhole electric heater (See Figure 1)
2. Electric heating of the outer wall of the oil pipe+ downhole electric heater (See Figure 2)
Bound onto the outer wall of the oil pipe for downhole operations at an interval of every 10m
Heating depth:1800m; Oil temperature at the wellhead: 60--80℃; Heating power: 50—1000Kw;
Power voltage: 3-phase 1140/660 VAC; or 660/380VAC; 380/220 VAC;
General technical requirements for the downhole electric heater:
Upper/lower fixing connection joint TBG2-1/2;
Heating depth—connected to the electric submersible screw pump; downhole oil temperature: 115℃; heating power: 50—1000Kw;
Power voltage: 660/380/220 VAC;
III.Principles
The entire flat cable of the submersible pump is metal armored, high-temperature resistant and corrosion-resistant and uses the pure resistance of the core wire for heating and conductivity. Bounded on the outer wall of the oil pipe in the well until the packer top required by the electric submersible screw pump structure (or the required depth) is reached, it uses the commercial power voltage, which is connected to the flat cable of the submersible pump to give off heat evenly to heat the oil pipe in the well, and heat the oil in the pipe evenly through the oil pipe in the well. (The voltage regulator may be used to increase the commercial power voltage).
The flat cable of the submersible pump connects the commercial power voltage to the downhole electric heater (made using the metal MI heating cable) to give off heat at a high power level in a centralized manner, and the oil at the bottom of the well is heated through convection heat exchange to increase oil temperature and reduce oil viscosity and enable the electric submersible pump to suck up the oil.
IV. Description of the technical scheme
The final installed electric heating system in the well is shown in the figure below:
Figure 1. Schematic of the downhole heating device
Application example:
1.Basic calculation data: oil field well number: CB243A-6#; CB243A-3#; well depth: 2000m.
Bushing diameter: 273.05mm; oil pipe diameter: 177.8mm
The calculations parameters of the well are as follows:
Daily crude oil production: 50T
Depth under the pump: 1250m
Temperature rise from heating and viscosity reducing under the pump: 15℃
The required length of the heating section in the well is : 1250m
Geothermal gradient: 3.9 ℃/100m
Power of the downhole electric heater under the pump: Kw
Radiating supplementing power of the well bushing: 40w/m
2.Select the flat cable of the submersible pump (electric heater):
Total calculated electric heating power 72 Kw,(downhole 21 Kw; shaft wall: 51 Kw)
Voltage adopted: 660/380VAC 3-phase, 4-wire; operating phase current: 63.2A
(Serial voltage distribution: downhole electric heater 110VAC; shaft wall: 270VAC;)
Model of the flat cable of the electric heater of the shaft wall: :QYEQ-3 3X6mm2; quantity: 1 piece;
Out dimension: 8.4X30mm; the metal jacket is zinc plated steel belt; heating power: 40.4w/m;
Model of the heating cable of the downhole electric heater: MICN-C 16C8/165/7000/110/G1/2; quantity: 3 pieces
Outer diameter: 5.3mm: type of the metal jacket: white copper; unit heating: 42.4w/m
Surface heating strength of the heating cable of the electric heater: 0.255 w/cm2 (may ensure that the heavy bodied oil will not be carbonized; capable of dry burning in oil with gas);
Wound into the electric heater. There is an anti-abrasion reinforcing bar outside the radiating orifice plate; length: 6m; with Φ140mm box-type centering device at the two ends; can withstand the guide abrasion with the well wall when lowered into the well.
3.Temperature control:
Changed to the cold-resistant soft cable when exiting the wellhead, which is led into the electric control box to allow for power transmission and temperature monitoring. The temperature electric control box is of the outdoor, weather-proof and non-explosion-proof type, and shall be located in the safe area.
The temperature settings of the temperature controller may be set on the site freely. The upper temperature limit of the factory is 82℃ and the lower temperature limit 78℃.
The temperature sensor is installed in the oil outlet pipe outside the oil nozzle, based on the temperature of which automatic control of electric heating operation is carried out.
4.Safety performance:
The flat cable of the submersible pump threaded into the pipe has high mechanical strength, is bound onto the outer wall of the oil pipe forming an integral whole with the oil pipe, and may withstand the abrasion with the shaft wall when lowered into the well. The oil pipe and cable fasteners in the well bear the weight of the flat cable of the submersible pump. The oil field may perform operations in the oil pipe without restrictions.
The maximum long-term operating temperature of all electric heating equipment in the well is +180℃; it is safe and reliable with a long service life.
The electric heater allows for easy installation, may be removed for repeated installation and use in accordance with the operation specification.
V. Brief description of installation
1.The lower end of the prefabricated electric heater is connected to the upper end of the electric submersible pump, the circumference of the electric heating element is distributed inside the bushing, and a centering device is provided at the two ends. The upper end of the electric heater is attached onto the oil pipe.
2.The flat cable of the submersible pump is lowered into the well together with the motor cable of the submersible pump, attached to the outer wall of the oil pipe in accordance with the cabling requirements of the submersible pump and lowered into the well continuously.
3.On the 120m or so packer, make mechanical connection seal at the two ends using the spigot-and-socket cable seal joint and the 1/2 capillary hole on the packer to solve the problem of the heating cable threading through the packer.
4.The flat cable of the submersible pump is threaded through the reserved hole of the wellhead suspender, and led out and sealed with the motor cable of the submersible pump separately.
5.Check to see if the electrical parameters of the electric heating system are normal.
6.Install the temperature electric control box, connect the power cable and control cable.
7.Ask the technical personnel of the oil field to check the installation quality.
8.Open the temperature electric control box for general commissioning.
9.Upon completion of general commissioning, furnish an application to the on-site supervisor of the oil field for energizing and putting the equipment into operation.
10.Procedures to energize and put the equipment into operation:
Turn on the master switch.
Start the electric heating system manually, observe to see if the time, voltage, current and temperature parameters are normal and record them.
One hour after energizing to warm up, start the electric submersible pump to extract oils on a trial basis.
Switch to the operating state of automatic temperature control.
Clean the construction site in accordance with the HSE standards. Complete the project handover procedures within 24 hours.
Note:
Initially after the electric heating equipment is energized, the oil field owner shall step up the work to observe and record the process parameters in the oil well during the first few days of operation.
The owner shall at its own expenses, provide the following assistance on the site: (tasks other than the lowering of the electric submersible pump into the well).
4. Leveling of the operation site;
VI.Construction safety measures:
VII.On-site construction arrangement: (See the figure 1below)
Figure 2: Structure diagram of the shaft
Figure 3: Downhole electric heater