Oilfield scale inhibitor preparation device

Abstract

This invention provides a scale inhibitor preparation apparatus for oilfields, comprising a high-speed stirred tank, a polymerization tank, a dropping tank, and a compounding tank. The outlet at the bottom of the high-speed stirred tank is connected to the inlet of the polymerization tank. The outlet of the dropping tank is connected to the inlet of the polymerization tank via a metering pump. A nitrogen pipe and a temperature measuring device are installed on the polymerization tank. The outlet of the polymerization tank is connected to the inlet of the compounding tank via a transfer pump. A circulation component is installed on the compounding tank to circulate the liquid at the bottom of the compounding tank to the top. The dropping tank and metering pump allow control of the dropping rate of monomers and initiators, ensuring stable reaction operation. Furthermore, the compounding tank and its circulation component enable high-speed circulation of the ternary polycarboxylic acid compound, and the stirring action provided by the compounding tank ensures the stability of the scale inhibitor product.

Description

Technical Field

[0001] This utility model relates to the field of scale inhibitor preparation, and in particular to a scale inhibitor preparation device for oilfields. Background Technology

[0002] During oilfield production, large quantities of reinjected water need to be transported through pipelines. The bicarbonates, carbonates, silicates, and sulfates present in the water, especially divalent metal salts, readily form water-insoluble crystals when temperature and concentration increase, resulting in scale buildup on the inner walls of the pipelines. Currently, adding scale inhibitors to the water is the most common method for preventing this.

[0003] Among them, polycarboxylic acid scale inhibitors have the following characteristics: the carboxylic acid groups have a good chelating effect on calcium, magnesium, copper and zinc in water, and also cause some interference to the normal arrangement of the crystal lattice during the crystallization process of inorganic salts.

[0004] In the preparation of polycarboxylic acid scale inhibitors, during the ternary polymerization reaction, it is essential to ensure that the polymer monomers are evenly dispersed, otherwise the molecular weight distribution will be uneven. Secondly, since the polymerization reaction is a free radical polymerization, the dropping rate of the monomers and initiators must be controlled to ensure stable reaction operation. Finally, during compounding, the ternary polycarboxylic acid compound needs to be circulated at high speed to dissolve with other components, ensuring the stability of the scale inhibitor product. Utility Model Content

[0005] This invention provides a scale inhibitor preparation device for oilfields to solve the technical problem of how to ensure the stability of scale inhibitor products.

[0006] This utility model solves the above-mentioned technical problems through the following technical solutions:

[0007] This utility model provides an oilfield scale inhibitor preparation device, including a high-speed stirring tank, a polymerization tank, a dropping tank, and a compounding tank; the discharge port at the bottom of the high-speed stirring tank is connected to the inlet of the polymerization tank; the discharge port of the dropping tank is connected to the inlet of the polymerization tank via a metering pump; a nitrogen pipe and a temperature measuring device are installed on the polymerization tank; the discharge port of the polymerization tank is connected to the inlet of the compounding tank via a transfer pump; a circulation component is installed on the compounding tank, which is used to circulate and transport the liquid at the bottom of the compounding tank to the top of the compounding tank; it also includes a telescopic discharge component, the inlet end of which is connected to the outlet of the compounding tank, and the outlet end of the telescopic discharge component is connected to an adjustment component.

[0008] Preferably, the high-speed mixing vessel is a twin-shaft high-speed mixing vessel; the high-speed mixing vessel is provided with a first agitator and a second agitator.

[0009] Preferably, the temperature measuring device includes an electronic temperature control display and a thermocouple thermometer; the electronic temperature control display is installed above the top of the polymerization reactor, the thermocouple thermometer is located inside the polymerization reactor, and the thermocouple thermometer is connected to the electronic temperature control display.

[0010] Preferably, a nitrogen inlet is provided on one side of the nitrogen pipe, and the nitrogen pipe is connected to an insertion tube, which extends below the reaction liquid level in the polymerization reactor.

[0011] Preferably, the metering pump is a plunger pump; the metering pump is connected to the outlet of the dropping kettle through a first connecting pipeline, and the metering pump is connected to the inlet of the polymerization kettle through a second connecting pipeline, and a first control valve is installed on the second connecting pipeline.

[0012] Preferably, the outlet of the high-speed mixing vessel is connected to the inlet of the polymerization vessel via a third connecting pipeline, and a second control valve is installed on the third connecting pipeline.

[0013] Preferably, the outlet of the polymerization reactor is connected to the transfer pump via a fourth connecting pipeline, and the transfer pump is connected to the inlet of the compounding reactor via a fifth connecting pipeline.

[0014] Preferably, the discharge port of the compounding reactor is connected to a sixth connecting pipeline, the bottom end of the sixth connecting pipeline is connected to a ninth connecting pipeline, and a third control valve is installed between the sixth connecting pipeline and the ninth connecting pipeline.

[0015] Preferably, the circulation component includes a circulation pump; the circulation pump is a homogenizing emulsification pump, the circulation pump is laterally connected to the sixth connecting pipeline through a seventh connecting pipeline, and the circulation pump is connected to the top of the compounding vessel through an eighth connecting pipeline.

[0016] Preferably, the telescopic discharge assembly includes a fixed pipe; the fixed pipe is connected to the ninth connecting pipeline, and a support frame is fixedly installed on the fixed pipe; the fixed pipe is connected to a discharge pipe through a corrugated flexible hose; the discharge pipe is bent downward to form a discharge port, and a valve is installed on the discharge port; the adjustment assembly is installed above the support frame, and the adjustment assembly includes a crossbeam fixed to the top of the support frame; a motor is fixedly installed at the bottom of the crossbeam; a screw is fixed to the output shaft end of the motor, and the screw is rotatably connected to the support frame; a nut seat is threaded onto the screw, and the nut seat is fixed to the discharge pipe; a slide is fixedly installed above the nut seat, and the slide is slidably connected to the crossbeam.

[0017] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0018] The positive and progressive effects of this utility model are as follows:

[0019] The aforementioned oilfield scale inhibitor preparation device utilizes a biaxial high-speed mixing vessel to provide biaxial stirring, ensuring uniform dispersion of polymer monomers. Furthermore, the addition of a dropping vessel and metering pump allows for control of the dropping rate of monomers and initiators, ensuring stable reaction operation. The compounding vessel and its circulation components enable high-speed circulation of the ternary polycarboxylic acid compound, which, combined with the stirring action provided by the compounding vessel, ensures the stability of the scale inhibitor product. Finally, the positioning and telescopic discharge components allow for adjustable outlet positions for the scale inhibitor. During loading, multiple ton containers are placed at the outlet position, and the outlet can be moved between these containers to switch the discharge position. Once a single ton container is full, the outlet can be quickly adjusted to be above other containers, facilitating the loading of the scale inhibitor. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the structure of the telescopic discharge assembly and the adjustment assembly of this utility model.

[0022] Figure 3 This is a schematic diagram of the structure above the polymerization reactor of this utility model.

[0023] Figure 4 This is a schematic diagram of the internal structure of the polymerization reactor of this utility model.

[0024] Figure 5 This is a schematic diagram of the structure of the high-speed stirring vessel of this utility model.

[0025] Explanation of reference numerals in the attached figures

[0026] 1. High-speed mixing vessel; 101. First agitator; 102. Second agitator; 2. Polymerization vessel; 201. Nitrogen pipe; 202. Electronic temperature controller display; 203. Thermocouple thermometer; 3. Compounding vessel; 4. Dropping vessel; 5. Metering pump; 6. First connecting pipeline; 7. Second connecting pipeline; 8. First control valve; 9. Tonnage container; 10. Third connecting pipeline; 11. Second control valve; 12. Fourth connecting pipeline; 13. Transfer pump; 14. Fifth connecting pipeline ; 15. Sixth connecting pipeline; 16. Seventh connecting pipeline; 17. Circulating pump; 18. Eighth connecting pipeline; 19. Third control valve; 20. Ninth connecting pipeline; 21. Telescopic discharge assembly; 2101. Fixed pipe; 2102. Corrugated hose; 2103. Discharge pipe; 2104. Valve; 22. Support frame; 23. Adjustment assembly; 2301. Crossbeam; 2302. Motor; 2303. Screw; 2304. Nut seat; 2305. Slide. Detailed Implementation

[0027] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0028] like Figure 1-5 As shown, the scale inhibitor preparation device for oil fields includes a high-speed stirring tank 1, a polymerization tank 2, a dropping tank 4, and a compounding tank 3;

[0029] The discharge port at the bottom of the high-speed stirring tank 1 is connected to the inlet of the polymerization tank 2;

[0030] The outlet of the dropping kettle 4 is connected to the inlet of the polymerization kettle 2 via a metering pump 5;

[0031] The polymerization reactor 2 is equipped with a nitrogen pipe 201 and a temperature measuring device; the outlet of the polymerization reactor 2 is connected to the inlet of the compounding reactor 3 through a transfer pump 13.

[0032] The compounding vessel 3 is equipped with a circulation component, which is used to circulate and transport the liquid at the bottom of the compounding vessel 3 to the top of the compounding vessel 3.

[0033] It also includes a telescopic discharge assembly 21, the inlet of which is connected to the outlet of the compounding kettle 3, and the outlet of which is connected to an adjustment assembly 23.

[0034] like Figure 5 As shown, the high-speed mixing vessel 1 is a twin-shaft high-speed mixing vessel; the high-speed mixing vessel 1 is equipped with a first stirrer 101 and a second stirrer 102. The mixing effect is improved by twin-shaft mixing.

[0035] like Figure 3-4 As shown, the temperature measuring device includes an electronic temperature control display 202 and a thermocouple thermometer 203. The electronic temperature control display 202 is installed above the top of the polymerization reactor 2, and the thermocouple thermometer 203 is located inside the polymerization reactor 2 and connected to the electronic temperature control display 202. Using the thermocouple thermometer 203 for temperature measurement ensures sensitive measurement, small error, and easy signal transmission and recording, making it suitable for polymerization reaction applications. The electronic temperature control display 202 is used to display the detected temperature.

[0036] like Figure 4 As shown, a nitrogen port is provided on one side of the nitrogen pipe 201, and an insertion tube is connected to the nitrogen pipe 201, with the insertion tube extending below the reaction liquid surface inside the polymerization reactor 2.

[0037] like Figure 1As shown, the metering pump 5 is a plunger pump; the metering pump 5 is connected to the outlet of the dropping kettle 4 through the first connecting pipeline 6, and the metering pump 5 is connected to the inlet of the polymerization kettle 2 through the second connecting pipeline 7, and a first control valve 8 is installed on the second connecting pipeline 7.

[0038] The outlet of the high-speed stirring vessel 1 is connected to the inlet of the polymerization vessel 2 via a third connecting pipeline 10, and a second control valve 11 is installed on the third connecting pipeline 10.

[0039] The discharge port of the polymerization reactor 2 is connected to the transfer pump 13 via the fourth connecting pipeline 12, and the transfer pump 13 is connected to the inlet of the compounding reactor 3 via the fifth connecting pipeline 14.

[0040] The discharge port of the compounding reactor 3 is connected to a sixth connecting pipeline 15, the bottom end of the sixth connecting pipeline 15 is connected to a ninth connecting pipeline 20, and a third control valve 19 is installed between the sixth connecting pipeline 15 and the ninth connecting pipeline 20.

[0041] The circulation assembly includes a circulation pump 17; the circulation pump 17 is a homogenizing emulsification pump, the circulation pump 17 is connected to the side of the sixth connecting pipeline 15 through the seventh connecting pipeline 16, and the circulation pump 17 is connected to the top of the compounding vessel 3 through the eighth connecting pipeline 18.

[0042] In a specific embodiment, two polymer monomers and water are added to the high-speed stirring vessel 1, and the first stirrer 101 and the second stirrer 102 are turned on to mix. After the mixture is uniform, the polymerization vessel 2 is evacuated, the second control valve 11 and the valve body on the outlet of the high-speed stirring vessel 1 are opened, the monomer aqueous solution is pumped into the polymerization vessel 2, and the second control valve 11 and the valve body on the outlet of the high-speed stirring vessel 1 are closed.

[0043] Then, stirring is started, and the temperature is lowered to the polymerization initiation temperature. Next, the third polymer monomer, initiator, and water are added to the dropping vessel 4, and stirring is started to mix them evenly. The first control valve 8 and the valve on the outlet of the dropping vessel 4 are opened, and the liquid in the dropping vessel 4 is added dropwise to the polymerization vessel 2 through the metering pump 5. At the same time, the temperature change inside the vessel is closely observed, and the dropping rate and the heating rate of polymerization are controlled. After the dropping is completed, the stirring reaction continues for a certain period of time until the reaction is complete. The valve on the outlet of the polymerization vessel 2 is opened, and the ternary polymer solution is transferred to the compounding vessel 3 using the transfer pump 13. Stirring is started, and other components are added. The circulation pump 17 is then turned on to circulate the solution, ensuring that the ternary polymer is evenly dispersed according to the process time.

[0044] After the above steps, the preparation of the scale inhibitor is completed; open the third control valve 19 and put the prepared scale inhibitor into the ton container 9 for packaging.

[0045] Furthermore, such as Figure 2As shown, the telescopic discharge assembly 21 includes a fixed pipe 2101; the fixed pipe 2101 is connected to the ninth connecting pipe 20, and a support frame 22 is fixedly installed on the fixed pipe 2101; the fixed pipe 2101 is connected to a discharge pipe 2103 through a corrugated flexible hose 2102; the discharge pipe 2103 is bent downwards to form a discharge port, and a valve 2104 is installed on the discharge port; the adjustment assembly 23 is installed above the support frame 22, and the adjustment assembly 23 includes components connected to the support frame. 22. A crossbeam 2301 is fixed at the top; a motor 2302 is fixedly installed at the bottom of the crossbeam 2301, and a screw 2303 is fixed at the output shaft end of the motor 2302. The screw 2303 is rotatably connected to the support frame 22. A nut seat 2304 is threadedly connected to the screw 2303, and the nut seat 2304 is fixed to the discharge pipe 2103. A slide 2305 is fixedly installed above the nut seat 2304, and the slide 2305 is slidably connected to the crossbeam 2301.

[0046] The prepared scale inhibitor is discharged into the ton container 9 through the telescopic discharge assembly 21. The position of the discharge port of the telescopic discharge assembly 21 can be adjusted laterally by the adjustment assembly 23. Figure 1 As shown, when adding multiple ton containers 9, after one ton container 9 is filled, the discharge port can be quickly adjusted to be above the other ton containers 9. Compared with the existing technology where the discharge port position is fixed and after a single ton container 9 is filled, it is necessary to drag the ton container 9 away from the feeding position and then push the empty ton container 9 in, the above-mentioned adjustable discharge port position design provides convenience for the loading of scale inhibitor.

[0047] This utility model is not limited to the above-described embodiments. Any changes in its shape or structure fall within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the protection scope of this utility model.

Claims

1. An oilfield scale inhibitor preparation device, characterized in that, It includes a high-speed stirring tank (1), a polymerization tank (2), a dropping tank (4), and a compounding tank (3); The discharge port at the bottom of the high-speed stirring tank (1) is connected to the inlet of the polymerization tank (2); The outlet of the dropping kettle (4) is connected to the inlet of the polymerization kettle (2) via a metering pump (5); The polymerization reactor (2) is equipped with a nitrogen pipe (201) and a temperature measuring device; the outlet of the polymerization reactor (2) is connected to the inlet of the compounding reactor (3) through a transfer pump (13); The compounding vessel (3) is equipped with a circulation component, which is used to circulate and transport the liquid at the bottom of the compounding vessel (3) to the top of the compounding vessel (3); It also includes a telescopic discharge assembly (21), the feed end of which is connected to the discharge port of the compounding kettle (3), and the discharge end of the telescopic discharge assembly (21) is connected to an adjustment assembly (23).

2. The oilfield scale inhibitor preparation device as described in claim 1, characterized in that: The high-speed mixing vessel (1) is a dual-shaft high-speed mixing vessel; the high-speed mixing vessel (1) is equipped with a first stirrer (101) and a second stirrer (102).

3. The oilfield scale inhibitor preparation device as described in claim 1, characterized in that: The temperature measuring device includes an electronic temperature control display (202) and a thermocouple thermometer (203); the electronic temperature control display (202) is installed on the top of the polymerization reactor (2), and the thermocouple thermometer (203) is located inside the polymerization reactor (2) and is connected to the electronic temperature control display (202).

4. The oilfield scale inhibitor preparation device as described in claim 1, characterized in that: A nitrogen port is provided on one side of the nitrogen pipe (201), and an insertion tube is connected to the nitrogen pipe (201), with the insertion tube extending below the reaction liquid surface inside the polymerization reactor (2).

5. The oilfield scale inhibitor preparation device as described in claim 1, characterized in that: The metering pump (5) is a plunger pump; the metering pump (5) is connected to the outlet of the dropping kettle (4) through the first connecting pipeline (6), and the metering pump (5) is connected to the inlet of the polymerization kettle (2) through the second connecting pipeline (7), and a first control valve (8) is installed on the second connecting pipeline (7).

6. The oilfield scale inhibitor preparation device as described in claim 1, characterized in that: The outlet of the high-speed stirring vessel (1) is connected to the inlet of the polymerization vessel (2) through a third connecting pipeline (10), and a second control valve (11) is installed on the third connecting pipeline (10).

7. The oilfield scale inhibitor preparation device as described in claim 1, characterized in that: The discharge port of the polymerization reactor (2) is connected to the transfer pump (13) via the fourth connecting pipeline (12), and the transfer pump (13) is connected to the inlet of the compounding reactor (3) via the fifth connecting pipeline (14).

8. The oilfield scale inhibitor preparation device as described in claim 1, characterized in that: The discharge port of the compounding vessel (3) is connected to a sixth connecting pipeline (15), the bottom end of the sixth connecting pipeline (15) is connected to a ninth connecting pipeline (20), and a third control valve (19) is installed between the sixth connecting pipeline (15) and the ninth connecting pipeline (20).

9. The oilfield scale inhibitor preparation device as described in claim 8, characterized in that: The circulation assembly includes a circulation pump (17); the circulation pump (17) is a homogenizing emulsification pump, the circulation pump (17) is connected to the side of the sixth connecting pipeline (15) through the seventh connecting pipeline (16), and the circulation pump (17) is connected to the top of the compounding vessel (3) through the eighth connecting pipeline (18).

10. The oilfield scale inhibitor preparation device as described in claim 8, characterized in that: The telescopic discharge assembly (21) includes a fixed pipe (2101); the fixed pipe (2101) is connected to the ninth connecting pipe (20), and a support frame (22) is fixedly installed on the fixed pipe (2101). The fixed pipe (2101) is connected to a discharge pipe (2103) through a corrugated hose (2102). The discharge pipe (2103) is bent downward to form a discharge port, and a valve (2104) is installed on the discharge port. The adjustment assembly (23) is installed above the support frame (22). The adjustment assembly (23) includes components connected to the support frame (22). A top-fixed crossbeam (2301); a motor (2302) is fixedly installed at the bottom of the crossbeam (2301), a screw (2303) is fixed at the output shaft end of the motor (2302), and the screw (2303) is rotatably connected to the support frame (22). A nut seat (2304) is threadedly connected to the screw (2303), and the nut seat (2304) is fixed to the discharge pipe (2103). A slide (2305) is fixedly installed above the nut seat (2304), and the slide (2305) is slidably connected to the crossbeam (2301).

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