other
HOT PRODUCT
  • Steam Injection And Oil Recovery Wellhead
    Steam Injection And Oil Recovery Wellhead

    ‌RockySea Petro Steam Injection And Oil Recovery WellheadGeothermal wellhead & x-mas treeBlowout preventer Steam Injection and Oil Recovery Integration wellhead & x-mas treeSteam injection and oil recovery dual tubing wellhead & x-mas treeSingle column dual-well thermal recovery wellhead & x-mas treeOnshore thermal recovery wellhead & x-mas treeConventional Steam injection and oil recovery wellhead & x-mas treeRockySea Petro has more than 40 years of experience in oil and gas wellhead & x-mas tree and valve

    VIEW DETAILS
  • Quick Lock Annular BOP
    Quick Lock Annular BOP

    ‌RockySea Petro Quick Lock Annular BOPGreatly reduce the time for replacing the ram and effectively improve work efficiency with safety.Compact structure and reduced weight means more operation room.20 years experience in designing and manufacturing QL annular BOP.The working principle and purpose of RockySea Petro QL annular blowout preventers are not fundamentally different from traditional blowout preventers, but their structure has been effectively improved. No need for large high torque bolts, convenie

    VIEW DETAILS
  • Safety Valve
    Safety Valve

    RockySea Petro Safety Valve25 years Safety valve manufacturing experienceFull support on your customised requirementThe strictest quality standards on Safety valveRockySea Petro Petro manufactures Safety valve in China. We have our own factory of Safety valve. RockySea Petro Petro provide the high quality and competitive price on Safety valve for you. Contact us now for Safety valve quotation.Description The RockySea Petro wellhead surface safety valve is a reverse acting gate valve with hydraulically actuated comp

    VIEW DETAILS
  • High Gas Cut Well Downhole Pump
    High Gas Cut Well Downhole Pump

    ‌RockySea Petro High Gas Cut Well Downhole PumpRockySea Petro Petro, have specially designed sucker rod pumps for high gas cut wells to avoid these problems: Gas locking prevention oil well pump, long plunger anti-gas & anti-sand downhole pump, forcing valved open type insert pump, double-plunger valve type sucker rod pump, etc.What is more serious? Operation with conventional sucker rod pump in high gas cut wells will result in liquid impact, which would accelerate the damage of tubing, sucker rod strings,

    VIEW DETAILS
  • Oilfield Steam Boiler
    Oilfield Steam Boiler

    RockySea Oilfield Steam BoilerSupercritical Oilfield Steam Injection BoilerDesulfurization and Denitrification Oilfield Steam BoilerProduced-water Oilfield Steam GeneratorSuperheated Oilfield Steam BoilerHigh-dryness Steam Injection BoilerThe Oilfield Steam Boiler is a Once Through Steam Generators with a forced circulation rate of 1. The pressure of medium flow is generated from the plunger pump. This steam injection boiler is mainly used for heavy oil recovery and extra-heavy oil recovery. Oilf

    VIEW DETAILS

Supercritical Oilfield Steam Injection Boiler

Date:2024-05-06 Popularity:740

RockySea Petro Supercritical Oilfield Steam Injection Boiler


  • Integrated Injection and Production Sucker Rod Pump
  • Thermal Recovery Packer
  • Vaccum Insluation Tubing & Casing
  • Series Thermal Recovery Wellhead
  • Ground Steam Injection Line
  • Water Treatment Device
  • Steam Injection Boiler
RockySea Petro is the thermal recovery solution supplier in China with 20 years of experience. RockySea Petro can provide customers with a complete set of thermal recovery equipment from surface steam injection boilers to underground thermal recovery downhole pumps. We can provide customers with the design, development, production, installation, commissioning, and stem injection services. RockySea Petro can produce the following auxiliary equipment for thermal recovery.


Description

In the heavy oil recovery, the pressure of some oil wells is high. The working pressure of subcritical steam injection generator cannot meet the needs of thermal recovery in high pressure heavy oil wells. In view of this situation, RockySea Petro developed a new oilfield  supercritical steam injection boiler. The rated pressure of gas injection boiler is higher than the critical pressure (22.15mpa) and the rated temperature is higher than the critical temperature (374.3℃).

EOR steam boiler

Characteristics of Supercritical Working Medium

The critical state is the limit thermodynamic state of the equilibrium coexistence of gas and liquid phases of a substance. In this state, the thermal state parameters of saturated liquid and saturated vapor are the same, and the interface between gas and liquid disappears, so there is no surface tension and the latent heat of gasification is zero. With the increase of pressure, the saturation temperature of water increases accordingly and the latent heat of vaporization decreases accordingly. In 21 MPa EOR steam boiler, if the dryness of steam is 80%, the average enthalpy is 2247.91kj/kg and the saturation temperature is 369.83 C. When the pressure reaches the critical pressure, if the steam temperature is controlled to operate at 374 C, the average enthalpy is only 1 821.33kj/kg, which means that when the pressure exceeds the critical pressure, the heat required for the working medium to rise temperature is much less than in the subcritical state.(The wall temperature of the furnace tube will also rise rapidly, which will easily lead to deterioration of heat transfer). steam quility measurment on an oilfield steam generator


Technical Difficulties of Supercritical Oilfield Steam Injection Boiler

The rated pressure of the Supercritical Oilfield steam generator exceeds the critical pressure (22.15mpa), and the temperature of the supercritical steam injection boiler exceeds the critical temperature (374.3 ℃), which makes the pressure and temperature of the steam injection boiler run higher, so the biggest difficulty is to keep the oilfield steam generator running safely. The biggest safety accident of oilfield indirect steam generator is tube burst, and the cause of tube burst is heat transfer deterioration. As long as the occurrence of heat transfer deterioration is avoided, the operation safety of boiler is basically guaranteed.



Supercritical Oilfield Steam Injection Boiler Introduction

The working principle of supercritical Oilfield steam injection boiler is different from that of one-through steam generator under sub-critical pressure. The flow pattern of water-steam system has changed fundamentally. Working medium is a single-phase medium. There is no boiling state when both vapors and liquids are identical, and only two single-phase fluids are changed. We have carried out the following three key design projects.

1. Move the heat exchange zone near the critical point prone to heat transfer crisis from radiation section to convection section in steam-water process.

In the design of supercritical oilfield steam generator, the heat exchange conditions near the critical point are complicated and it is impossible to accurately calculate the heat exchange coefficient and wall temperature. Therefore, in the design of boilers, it is necessary to avoid arranging this section in the area of maximum heat load Q (i.e. the center of flame).After checking calculation, it can be seen that heat transfer deterioration may occur in radiation section under low load, and heat transfer deterioration will not occur in convection section because maximum heat load is much lower than radiation section.(Radiation section q=92kw/m2, convection section q=70kw/m2).



2. Internal threaded tube is used in both radiation and convection high temperature zones.

12Cr1MoVG internal threaded boiler tube is used in both high temperature parts of radiation section and convection section. The temperature resistance can reach 580 C and the high temperature performance is good. Its special structure can also effectively prevent the deterioration of heat transfer. Its main functions for preventing or delaying deterioration of heat transfer are:

  • surface area of pipe is increased; Reduce heat load on inner wall.
  • liquid film in internal threaded groove is not easily carried by central steam flow;
  • heat resistance of boundary layer is reduced, heat transfer is strengthened and wall temperature is reduced due to strong rotation of steam flow;
  • strong rotating steam flow formed by working fluid under the action of internal threads, which causes droplets to settle on the pipe wall;

3. Reverse Osmosis + EDI + Membrane Deaeration Process is adopted

Supercritical oilfield steam generator is different from the original subcritical Oilfield steam generator because of its water vapor system characteristics, so the supporting water treatment equipment should not only consider the removal of hard and oxygen, but also must consider the removal of salt in water, so as to ensure the safe use of the boiler.



4. Targeted OTSG Automatic Control System

In order to ensure the safe operation of the supercritical steam injection boiler, the automatic control system of the boiler is optimized

  • Set up multiple alarm points and shutdown points to ensure safe operation of the boiler
    When the boiler has high steam pressure, high steam temperature, high exhaust gas temperature, high pipe wall temperature (measuring 2 points), burner throat temperature is high, primary air pressure is low, secondary air pressure is low, inlet water pressure is low, fuel oil temperature is low, plunger pump lubricating oil pressure is low, power supply failure, flame failure, convection inlet temperature overrun, low feed water flow and other phenomena will automatically alarm.
  • Good hardware guarantee ensures the accurate operation of the automatic control system.
    PLC host adopts high-end CS1 series products of OMRON company, which not only has high reliability and supports complex mathematical calculation, but also has powerful network communication management function, which can be easily connected with upper computer. It is equipped with high-precision 8-channel A / D module and D / a module to ensure the accuracy of each variable detection result;

Supercritical Oilfield Steam Injection Boiler Technical Parameters

  • Loading mode: Trailer
  • Control mode: PLC + touch screen + industrial computer
  • Fuel: Oil and Gas Dual Use
  • Load adjustment: 70%-100%
  • Rated thermal efficiency: >90%
  • Rated steam temperature: 390℃
  • Rated steam pressure: 26 MPa
  • Rated evaporation: 9.2 t/h

RockySea Petro Copyright © 2008-2025 Inc. SITEMAP