Modularized salt box of oil field steam-injection boiler

Abstract

A modularized salt box of an oil field steam-injection boiler comprises a box body, an exhaust fan, an air filter and a salt unloading hovering assist device, the interior of the box body is divided into a salt stacking side and a salt water side through a partition plate, sieve holes are formed in the lower portion of the partition plate, an air drainage elbow is arranged on the upper portion of the partition plate, and a water inlet pipe and a salt outlet pipe are arranged on the lower portion of the salt water side on the box body. An air inlet, an air outlet and an exhaust fan are arranged on the box body, the air inlet and the air outlet are respectively positioned on a salt stacking side and a saline water side, the exhaust fan is connected with the air outlet, the air inlet is connected with a suction nozzle, and the suction nozzle is connected to a salt unloading hovering assist device. The device is suitable for oil field heavy oil thermal recovery development, flexible, convenient to move, high in efficiency and low in safety risk.

Description

Technical Field

[0001] The present invention specifically relates to a salt box used in a steam injection station of an oil field steam injection boiler, and belongs to the technical field of oil field steam injection boilers. Background Art

[0002] When the oil field is in steam injection operation, industrial salt is needed to regenerate the resin of the water treatment device to restore the resin's exchange effect on calcium and magnesium ions, ensuring that the water treatment can continuously produce qualified water for the boiler.

[0003] Industrial salt for regeneration is mainly stored in salt boxes and used on site, with a storage capacity of about 2 to 3 tons. During operation, the water quality needs to be tested regularly to determine whether regeneration is needed. The regeneration operation will consume some industrial salt. When the salt in the salt box is not enough, it needs to be replenished manually; the industrial salt is transported to the site by a flatbed truck and unloaded into the salt box manually or by a forklift.

[0004] This approach has the following problems:

[0005] 1. Salt is unloaded manually or by forklift at the steam injection site, which is labor-intensive, inefficient, and poses risks such as falling from heights and environmental pollution.

[0006] 2. The placement of auxiliary equipment at the steam injection site will be adjusted according to factors such as the size and shape of the well site. If the well site conditions are poor and the space is small, the well site will be limited. When placing, not only the safe distance of the steam injection auxiliary equipment needs to be considered, but also the salt truck's entry and parking routes must be planned according to the salt unloading needs, and obstacles along the way must be cleared, which affects the production order and is extremely inconvenient to operate.

[0007] At present, there are two types of salt boxes at the steam injection site: ordinary salt boxes and integrated salt boxes. Ordinary salt boxes are installed on a lifting skid and placed at the well site by a crane. The height from the ground is relatively low. When placing, it is necessary to consider that the distance from the water treatment should not be too far to prevent the process from being too long and causing the inability to establish the brine pressure. The integrated salt box is combined with the water treatment skid and installed at the tail of the water treatment skid. The height from the ground is more than 3 meters and no lifting is required. Manual and forklift unloading of salt can only meet the unloading needs of ordinary salt boxes, while manual and forklift unloading of salt when unloading integrated salt boxes cannot meet the requirements of fast, safe and low-loss on-site salt unloading.

[0008] When the boiler operates at a high frequency, the number of water treatment regeneration times increases, the industrial salt consumption increases, and on-site salt unloading occurs from time to time; when the salt truck enters the site, it may be necessary to temporarily remove some soft and hard connections, and even cause equipment to stop operating. The steam injection boiler operates at high temperature and high pressure, and the frequent entry and exit of salt trucks in and out of the site will have a serious impact on production order. Summary of the invention

[0009] In view of the shortcomings of the salt boxes used in existing oilfield steam injection boilers, the present invention provides a modular salt box for oilfield steam injection boilers with high salt unloading efficiency, safety and reliability, so as to adapt to different on-site usage scenarios and complex salt unloading environments, reduce the workload of manual salt unloading, reduce work intensity, improve salt unloading efficiency, and avoid the impact of salt unloading on production order.

[0010] The modular salt box of the oilfield steam injection boiler of the present invention adopts the following technical solutions:

[0011] The salt box comprises a box body, an exhaust fan, an air filter and a salt unloading suspension auxiliary device. The interior of the box body is divided into a salt pile side and a brine side by a partition. The lower part of the partition is provided with sieve holes, and the upper part of the partition is provided with an air drainage elbow. A water inlet pipe and a salt outlet pipe are provided at the lower part of the brine side of the box body. An air inlet, an air outlet and an exhaust fan are provided on the box body. The air inlet and the air outlet are respectively located on the salt pile side and the brine side. The exhaust fan is connected to the air outlet, and the air inlet is connected to the suction nozzle.

[0012] The top of the box is provided with an observation hole, and the side wall of the box is provided with a ladder to facilitate observation of the internal situation of the box.

[0013] The outlet of the air guide elbow is vertically downward.

[0014] The water inlet pipe and the salt outlet pipe are respectively connected with a water inlet valve and a salt outlet valve, and are both equipped with quick connectors.

[0015] The portion of the water inlet pipe extending into the box body is provided with a water diversion hole to promote the circulation of salt water in the box body.

[0016] The outer port of the salt outlet pipe is provided with a filter screen to prevent debris from blocking the brine flow.

[0017] The air inlet is installed at the far end diagonal of the box body, and a quick connector is installed at the outer end.

[0018] The air inlet and the air outlet are diagonally shaped.

[0019] The exhaust fan is connected to the air outlet through an air outlet pipe and an air filter, the exhaust fan is connected to the air filter through the air outlet pipe, and the air filter is connected to the air outlet.

[0020] The suction nozzle is arranged on the salt unloading suspension auxiliary device, and the salt unloading suspension auxiliary device is arranged on the box body. The salt unloading suspension auxiliary device includes a fixed seat, a suspension bracket, a telescopic damper, a damping universal head and a telescopic suction nozzle. The suspension bracket is connected to the fixed seat. One end of the damping universal head is installed at the end of the suspension bracket, and the other end is connected to the telescopic damper. The telescopic damper has a fixed end and an extended end, and the suction nozzle is connected to the telescopic damper. The suspension bracket is a bracket with two movable joints, and a spring is used to realize the suspension function. The suction nozzle is a telescopic suction nozzle, which is formed by nesting inner and outer tubes. The upper end of the outer tube is connected to the fixed end of the telescopic damper, and the lower end of the inner tube is connected to the movable end of the telescopic damper.

[0021] The vacuum pump is used to evacuate the inside of the box. The airflow carries salt particles into the box from the air inlet and accumulates on the salt pile side of the box under the action of gravity. After the airflow passes through the air diversion elbow on the partition, the impurity particles are separated from the airflow for the second time under the action of gravity, realizing the secondary filtration of the airflow inside the box, improving the air purity, reducing the cleaning frequency of the air filter, and increasing the service life of the exhaust fan. The partition sieve holes are used for bottom brine diversion, and the air diversion elbow is used for internal airflow diversion. The salt outlet pipe is used to lead the brine out of the box.

[0022] The present invention is applicable to the thermal recovery of heavy oil in the oil field, and is flexible, easy to move, highly efficient, and has few safety risks; it has the following advantages:

[0023] 1. The self-priming salt unloading and modular design concept integrates the salt unloading function required by the steam injection station into the box, which occupies a small area, has strong functions and reasonable design. It can meet the production and living needs of grassroots stations and provide sufficient functional guarantees for the new steam injection system.

[0024] 2. The use of the salt unloading suspension assistant further reduces the intensity of on-site salt unloading work. Workers only need one hand to adjust the position and angle of the suspension bracket to achieve continuous salt unloading.

[0025] 3. Realize the whole process of negative pressure self-priming salt unloading without leakage risk, reduce the safety and environmental protection pressure of enterprises, and promote green and safe production.

[0026] 4. Solve the contradiction between route planning, parking and steam injection operation of salt trucks entering and leaving the well. Multiple quick-connect bellows can be used in connection. The use of soft connections can avoid most of the hard processes and obstacles at the steam injection site. The parking and placement of salt trucks at the well site are more flexible. As long as they are within the length coverage of the bellows, self-priming and salt unloading can be achieved. It greatly improves the adaptability of steam injection well sites, and is particularly suitable for well sites with limited areas.

[0027] 5. The diagonal arrangement of the air inlet and the air outlet (air filter) of the box not only lengthens the running distance of the airflow inside the box, but also makes the airflow run according to the set track after entering the box from the air inlet. The airflow carries salt particles into the box from the air inlet; they are accumulated on the salt pile side of the box under the action of gravity. After the airflow passes through the air diversion elbow on the partition, the impurity particles in the airflow are separated from the airflow for the second time under the action of gravity, realizing the secondary filtration of the airflow inside the box, improving the air purity, reducing the cleaning frequency of the air filter, and increasing the service life of the exhaust fan.

[0028] 6. The modular design of the device and the reserved fixing holes on the base make it suitable for ordinary steam injection and new water treatment steam injection scenarios, further enhancing the production guarantee capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a modular salt box of an oil field steam injection boiler according to the present invention.

[0030] Figure 2 A top view of a modular salt box for an oilfield steam injection boiler according to the present invention.

[0031] Figure 3 It is a structural schematic diagram of the present invention.

[0032] In the figure: 1. exhaust fan, 2. air inlet, 3. box, 4. base, 5. air outlet pipe, 6. air filter, 7. observation hole, 8. partition, 9. water inlet pipe, 10. salt outlet pipe, 11. filter screen, 12. quick-connect bellows,

[0033] 13. Quick-connect nozzle;

[0034] 14. Telescopic damper, 15. Suspension bracket, 16. Fixed seat, 17. Damping universal head, 18. Telescopic suction nozzle. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1 and Figure 2 As shown, the modular salt box of the oilfield steam injection boiler of the present invention comprises a base 4, a box body 3, an exhaust fan 1, an air filter 6 and a salt unloading suspension auxiliary device. The base 4 is welded with stainless steel I-beams, and a plurality of screw holes are left on the bottom plane of the I-beams for fixing.

[0037] The box body 3 is connected (welded) to the base 4. The box body 3 is made of stainless steel and has a cubic structure. A rectangular space is left on it for installing a ladder and an external valve group (water inlet pipe 9 and salt outlet pipe 10). The ladder is used to facilitate operators to climb up to the second-floor platform to observe the internal situation of the box body through the observation hole 7. The observation hole 7 is a round stainless steel observation hole with a window, and a plurality of sealing knobs are used to achieve the sealing function. The upper part of the box body 3 is provided with an exhaust fan 1 and an air filter 6. Four lifting ears are also installed at the four diagonals on the upper part of the box body 3.

[0038] A stainless steel partition 8 is arranged (welded) inside the box 3 to separate the box 3 into two parts: the salt pile side and the brine side. The lower part of the partition 8 is provided with dense sieve holes with a diameter of 2 mm, and the upper part is provided with DN80 stainless steel air diversion elbows with two outlets facing vertically downward. The lower sieve holes are used for bottom brine diversion, and the upper air diversion elbow is used for internal airflow diversion.

[0039] A water inlet pipe 9 and a salt outlet pipe 10 are provided at the lower part of the salt water side of the box body 3, and the water inlet pipe 9 and the salt outlet pipe 10 are connected with a water inlet valve and a salt outlet valve respectively. The water inlet pipe 9 and the salt outlet pipe 10 are DN65 stainless steel pipes, which are welded on the vertical surface of the box body 3 and are both equipped with ball valves and stainless steel quick connectors. The water inlet pipe 9 extends into the interior of the box body 3 and is flush with the opposite inner wall of the box body 3. The part of the water inlet pipe 9 extending into the box body 3 is provided with a plurality of water diversion holes to promote the circulation of salt water in the box body 3. The salt outlet pipe 10 is used to lead the salt water in the box body 3. A filter screen 10 is provided at the outer port of the salt outlet pipe 10, which is a structure of an outer frame plus a filter screen to prevent debris from blocking the salt water flow.

[0040] The upper part of the box body 3 is equipped with an exhaust fan 1 and an air outlet pipe 5. The two ends of the air outlet pipe 5 are connected to the exhaust fan 1 and the air filter 6 respectively. The inlet of the air filter 6 is connected to the air outlet of the box body 3, and the installation position is diagonal to the air inlet 2. Figure 2 , the air outlet of the box 3 is on the brine side, and the air inlet 2 is on the salt pile side. The air inlet 2 is installed at the far diagonal of the box 3. One end of the air inlet 2 is welded to the box 3 at a 90° angle, and a DN80 stainless steel quick connector is installed on the other end. The quick connector is connected to the quick-connect nozzle 13 through a quick-connect bellows 12, or is connected to the telescopic nozzle 18 in the salt unloading suspension assistant. The quick-connect bellows 12 is a dn80PVC material hose, lined with steel wire, and equipped with stainless steel quick-connect male and female heads at both ends (respectively connected to the quick connectors on the air inlet 2 and the nozzle). The quick-connect nozzle 13 is a DN80 acrylic transparent tube, about 0.5m long, with a stainless steel quick connector at one end.

[0041] The air filter 6 uses a 2.5-inch air filter, and an openable sealing cover is provided on the top of the air filter 6 for replacing the internal filter element. The diagonal arrangement of the air inlet 2 and the air filter 6 lengthens the running distance of the airflow inside the box 3, and at the same time, the airflow runs according to the set track after entering the box 3 from the air inlet 2. The airflow carries salt particles into the box 3 from the air inlet 2, and accumulates on the salt pile side of the box under the action of gravity. After the airflow passes through the air diversion elbow on the partition 8, the impurity particles in the airflow are separated from the airflow for the second time under the action of gravity, realizing the secondary filtration of the airflow inside the box, improving the air purity, reducing the cleaning frequency of the air filter, and increasing the service life of the exhaust fan.

[0042] like Figure 3 As shown, the salt unloading suspension assistant includes a fixed seat 16, a suspension bracket 15, a telescopic damper 14, a damping universal head 17 and a telescopic suction nozzle 18. The suspension bracket 15 is fixedly connected to the fixed seat 16, and is a U-shaped fastening structure with fixing screws on both sides, which can be fixed on the side panel of the trailer. The suspension bracket 15 is a bracket with two movable joints, which uses a spring to achieve the suspension function and is used to support front-end devices such as the suction nozzle 18. One end of the damping universal head 17 is installed at the end of the suspension bracket 15, and the other end is connected to the telescopic damper 14 for support and angle adjustment. The telescopic damper 14 is divided into a fixed end and an extension end. After the length of the extension end is manually adjusted, the length of the extension end can be kept unchanged, and it has a certain damping function. The telescopic suction nozzle 18 is formed by nesting two transparent acrylic tubes of DN80 and DN76 sizes. The upper end of the DN80 tube is connected to the fixed end of the telescopic damper 14, and the lower end of the DN76 tube is connected to the movable end of the telescopic damper 14, forming a suction nozzle structure with a certain damping effect and adjustable acrylic tube extension length.

[0043] The process of the above-mentioned box body unloading salt by self-priming from the salt truck is as follows.

[0044] 1. Instruct the salt truck to stop at a position where the quick-connect bellows 13 can reach. Multiple quick-connect bellows can be connected and used;

[0045] 2. The operator climbs onto the salt truck bed and selects a suitable position to install and fix the fixing seat 16 on the side panel of the salt truck according to the coverage area of ​​the suspension bracket 15 ; the end of the suspension bracket 15 is inserted into the fixing seat 16 .

[0046] 3. The outlet of the telescopic suction nozzle 18 is connected to the inlet of the quick-connect bellows 12;

[0047] 4. The outlet of the quick-connect bellows 12 is connected to the air inlet 2;

[0048] 5. Check and confirm that all valves are in the closed state;

[0049] 6. Check that all components can work normally;

[0050] 7. Start the exhaust fan 1 to form a negative pressure in the box 3;

[0051] 8. Manually adjust the position of the telescopic damper 14 and the suspension bracket 15, select the labor-saving self-priming position to ensure that the suction port of the telescopic suction nozzle 18 is inserted into the salt pile, and the industrial salt is continuously inhaled. After the salt pile at the current position becomes smaller, continue to adjust the height and angle position of the suspension bracket 15, and continue to carry out salt suction work within the coverage of the suspension bracket 15.

[0052] The above salt box is used for common steam injection site scenarios:

[0053] 1. Hang the lifting cable on the lifting lug of the box body 3, command the crane to lift the device and place it at a suitable position at the steam injection site.

[0054] 2. Remove the lifting cable and connect the water inlet pipe 9 to the water treatment water supply port to supply water to the box 3.

[0055] 3. Connect the salt outlet pipe 10 to the inlet of the water treatment salt pump to provide saturated concentrated brine for water treatment.

[0056] 4. Install two grounding wires at the diagonals as required, and connect the ends of the grounding wires to the reserved grounding electrodes.

[0057] 5. Preparation work for the use of modular boxes at ordinary steam injection sites is completed.

[0058] The above salt box is used for new water treatment scenarios:

[0059] 1. Hang the lifting cable on the lifting lug of the box 3, command the crane to lift the device, observe whether there is mud or impurities at the bottom of the device base 4, and clean them in time. Command the crane to place the device in the box position of the new water treatment skid.

[0060] 2. Check that the placement is appropriate and that the bolt fixing holes at the bottom of the base 4 are flush; use bolts to fix the device to the box position of the water treatment skid.

[0061] 3. Remove the lifting cable and connect the water inlet pipe 9 to the water supply port of the new water treatment to supply water to the box.

[0062] 4. Connect the salt outlet pipe 10 to the inlet of the water treatment salt pump to provide saturated concentrated brine for water treatment.

[0063] Preparations for use of the modular box for the new water treatment steam injection site are complete.

Claims

1. A modular salt box for oilfield steam injection boiler, characterized by: It includes a box body, an exhaust fan, an air filter and a salt unloading suspension assistant. The interior of the box body is divided into a salt pile side and a brine side by a partition. Sieve holes are arranged at the lower part of the partition, and an air drainage elbow is arranged at the upper part of the partition. A water inlet pipe and a salt outlet pipe are arranged at the lower part of the brine side of the box body. An air inlet, an air outlet and an exhaust fan are arranged on the box body. The air inlet and the air outlet are respectively located on the salt pile side and the brine side. The exhaust fan is connected to the air outlet, and the air inlet is connected to the suction nozzle.

2. The modular salt box for oilfield steam injection boiler according to claim 1 is characterized by: The outlet of the air guide elbow is vertically downward.

3. The modular salt box for oilfield steam injection boiler according to claim 1 is characterized by: An observation hole is arranged on the top of the box body, and a ladder is arranged on the side wall of the box body.

4. The modular salt box for oilfield steam injection boiler according to claim 1 is characterized by: The water inlet pipe and the salt outlet pipe are respectively connected with a water inlet valve and a salt outlet valve, and are both equipped with quick connectors.

5. The modular salt box for oilfield steam injection boiler according to claim 1 is characterized by: The portion of the water inlet pipe extending into the box body is provided with a water diversion hole.

6. The modular salt box for oilfield steam injection boiler according to claim 1 is characterized by: The outer port of the salt outlet pipe is provided with a filter screen.

7. The modular salt box for oilfield steam injection boiler according to claim 1 is characterized by: The air inlet is installed at the far end diagonal of the box body, and a quick connector is installed at the outer end.

8. The modular salt box for oilfield steam injection boiler according to claim 1 is characterized by: The air inlet and the air outlet are diagonally shaped.

9. The modular salt box for oilfield steam injection boiler according to claim 1 is characterized by: The exhaust fan is connected to the air outlet through an air outlet pipe and an air filter, the exhaust fan is connected to the air filter through the air outlet pipe, and the air filter is connected to the air outlet.

10. The modular salt box for oilfield steam injection boiler according to claim 1 is characterized by: The suction nozzle is connected to the salt unloading suspension auxiliary device, and the salt unloading suspension auxiliary device is arranged on the box body.

11. The modular salt box for oilfield steam injection boiler according to claim 10 is characterized by: The salt unloading suspension assistant comprises a fixed seat, a suspension bracket, a telescopic damper, a damping universal head and a telescopic suction nozzle. The suspension bracket is connected to the fixed seat, one end of the damping universal head is installed at the end of the suspension bracket, and the other end is connected to the telescopic damper. The telescopic damper has a fixed end and an extended end, and the suction nozzle is connected to the telescopic damper.

12. The modular salt box for oilfield steam injection boiler according to claim 11 is characterized by: The suspension bracket is a bracket with two movable joints.

13. The modular salt box for oilfield steam injection boiler according to claim 11, characterized in that: The suction nozzle is a telescopic suction nozzle, which is formed by nesting inner and outer tubes, the upper end of the outer tube is connected to the fixed end of the telescopic damper, and the lower end of the inner tube is connected to the movable end of the telescopic damper.

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