An intelligent skid-mounted polymer rapid dissolution device

Abstract

The present invention discloses an intelligent skid-mounted polymer rapid dissolution device. The dissolution device includes a control system, a spiral feeding system, a spray gouache mixing system, a forced stretching system and a strong dispersion system; the spray gouache mixing system includes a mixing bin, and a nozzle is provided in the mixing bin for forming the polymerized water into a mist; the discharge port of the spiral feeding system is provided at the upper part of the mixing bin of the spray gouache mixing system to transport the polymer dry powder into the mixing bin and contact it with the water mist sprayed from the nozzle; the outlet of the mixing bin is connected to the forced stretching system and the strong dispersion system in sequence to force stretching and dispersion of the polymer respectively. The present invention uses the forced stretching and strong dispersion systems in series, which further enhances the dissolution effect and significantly reduces the dissolution time. After treatment, a uniform polymer solution is directly obtained, which can be directly connected to the production injection system; the aging tank is completely abandoned, which greatly reduces the floor space.

Description

Technical Field

[0001] The invention relates to an intelligent skid-mounted polymer rapid dissolution device, belonging to the technical field of petroleum engineering. Background Art

[0002] In the oil production process, polymer flooding is a key technology for enhancing oil recovery. This method involves injecting a uniform solution of a water-soluble polymer into the oil reservoir, achieving a significant oil displacement effect and thus enhancing oil recovery. Dissolving the polymer to form a uniform solution is a key step in the implementation of this technology. The current conventional dissolution process involves thoroughly mixing solid powder with water, pumping it into a dissolution tank for mixing. The mixture is then transferred to a maturation tank for swelling and dissolution to form a mother liquor. Finally, the solution is diluted to the working concentration and injected into the formation. A major drawback of this conventional dissolution process is its long dissolution time. This is particularly true for salt-tolerant and shear-resistant polymers used in offshore oilfields, which typically require approximately 2 to 4 hours to fully dissolve. This results in a bulky maturation tank and requires significant floor space. However, limited space on offshore platforms cannot meet the equipment requirements of conventional dissolution processes, thus limiting the large-scale application of polymer flooding in offshore oilfields. Therefore, there is an urgent need for a rapid polymer dissolution device that requires minimal footprint and fast dissolution time.

[0003] Currently, research on rapid polymer dissolution technology and devices has received considerable attention, but most of these technologies are improvements to existing conventional dissolution processes. For example, Chinese patent applications CN1100260990A and CN85101584A disclose two rapid dissolution devices, the improvements of which mainly lie in the mixing and stirring devices at the front end, while the back end still requires a maturation tank for maturation, and the overall area is still relatively large. Chinese patent applications CN1130584500A and CN2142336560U disclose two polymer dispersion and dissolution devices, which improve the internal structure of the dissolution device but do not change the dissolution method. Chinese patent application CN1088546080B improves the degradation of the mother liquor by adopting nitrogen sealing, but the improvement in dissolution is limited. Some studies have also employed unconventional methods and equipment to rapidly dissolve polymers. For example, Chinese patent applications CN10314275A and CN1093512190A disclose two devices for accelerating the dissolution of polymer particles, employing a combination of movable and fixed geared discs to achieve rapid polymer dissolution. Patent CN102059060A discloses a method and device for dissolving hydrophobic polymers, utilizing a combination of movable and fixed grinding wheels to accelerate polymer dissolution. However, these methods still fail to completely eliminate the need for a aging tank. Therefore, improvements are needed to existing polymer dissolution devices. Summary of the Invention

[0004] The purpose of the present invention is to provide an intelligent skid-mounted polymer rapid dissolution device, which has a short polymer dissolution time and a uniform solution; the device occupies a small area and is easy to transport and use; and it has intelligent control and requires little manual intervention.

[0005] The intelligent skid-mounted polymer rapid dissolution device provided by the present invention includes an intelligent control system, a spiral feeding system, a spray water-powder mixing system, a forced stretching system and a strong dispersion system;

[0006] The spray water-powder mixing system includes a mixing chamber, wherein a nozzle is provided in the mixing chamber for forming the mixed water into a mist;

[0007] The discharge port of the spiral feeding system is arranged at the upper part of the mixing chamber of the spray water-powder mixing system, so as to transport the polymer dry powder into the mixing chamber and contact the polymer dry powder with the water mist sprayed from the nozzle;

[0008] The outlet of the mixing chamber is connected to the forced stretching system and the strong dispersion system in sequence to respectively perform forced stretching and dispersion on the polymer;

[0009] The intelligent control system is respectively connected with the spiral feeding system, the spray water-powder mixing system, the forced stretching module and the strong dispersion module.

[0010] In the above-mentioned polymer rapid dissolution device, the intelligent control system includes a power supply system, a safety system, a touch screen display / control system, a PLC, a frequency conversion system and a signal transmission system;

[0011] The power supply system controls the switching of all devices and distributes the power provided by the external platform to each device as needed;

[0012] The safety system controls the safety of the equipment during operation. Once a problem occurs, it will automatically take measures such as stopping feeding and issuing an alarm to ensure safety.

[0013] The touch screen display / control system integrates display and control. While visually displaying all operating parameters on the flow chart, it can also modify relevant control parameters, thus enhancing the adaptability of the equipment.

[0014] The PLC receives signals from the touch screen control system and the signal transmission system and transmits them to the frequency conversion system after processing;

[0015] The frequency conversion system controls the frequency conversion motor of the polymer rapid dissolution device and adjusts the appropriate speed according to the signal of the PLC;

[0016] The signal transmission system collects instrument signals from the polymer rapid dissolution device and transmits them to the PLC;

[0017] The interaction of these six systems enables intelligent control of the device, including fully automatic and stable operation, automatic adjustment of the solution volume and concentration based on site needs, and the ability to adapt to the preparation of a variety of polymer solutions by changing parameters. All of these systems are housed in an explosion-proof cabinet, meeting the requirements of oilfield operations.

[0018] In the above-mentioned polymer rapid dissolution device, the screw feeding system includes a screw feeder and a hopper, which is responsible for feeding the polymer powder;

[0019] The hopper can meet the production requirements for 4 to 8 hours depending on the concentration of the prepared solution. During the operation of the device, it is only necessary to regularly feed the hopper.

[0020] Preferably, the screw feeder is connected to a variable frequency explosion-proof motor (speed adjustable from 0 to 2850 rpm), the speed of which is linked to the flow rate of the polymerized water through the PLC to achieve automatic adjustment at different flow rates to ensure consistent concentration of the polymer solution;

[0021] Preferably, the screw feeder is calibrated with different types of polymers (polymers include but are not limited to AP-P4, heavy oil activator, etc.), and the calibration equation is input into the control system, which needs to be selected and confirmed according to requirements before the device of the present invention is operated.

[0022] In the above-mentioned polymer rapid dissolution device, the nozzle is connected to a distribution water delivery pipeline, and an electric regulating valve and a flow meter are provided on the distribution water delivery pipeline. The processing volume of the polymer rapid dissolution device is controlled by interlocking the electric regulating valve and the flow meter signal;

[0023] The processing capacity of the polymer rapid dissolution device of the present invention can be 5 to 20m 3 / h;

[0024] In the spray water-powder mixing system, the polymer dry powder is fully in contact with the water mist formed by the polymerizing water, thereby improving the mixing effect and effectively preventing agglomeration;

[0025] Preferably, a liquid level meter is provided in the mixing bin of the spray gouache mixing system, and its value is linked to the rotation speed of the material transfer pump to control the liquid level in the bin and achieve stable operation of the device.

[0026] In the aforementioned polymer rapid dissolution device, the forced stretching system includes a multi-stage toothed disc, which sequentially mixes, coarsely grinds, and finely grinds the water-powder mixture as it passes through, destroying the hydration layer on the surface of the polymer powder while forcibly stretching the polymer chain segments, significantly enhancing the dissolution effect and greatly shortening the dissolution time.

[0027] Preferably, the multi-step toothed disc has 2 to 4 steps, the number of teeth gradually increases from the inside to the outside, and the flow channel cross section gradually decreases;

[0028] Preferably, the forced stretching system adopts a two-stage series design, and the spacing between the toothed discs is 0.5 to 5 mm.

[0029] In the above-mentioned polymer rapid dissolution device, the powerful dispersion system is provided with a powerful disperser and a filler;

[0030] By utilizing the dispersing effect of the strong dispersing field, the solid-liquid mass transfer coefficient is significantly enhanced. At the same time, the interception and stretching effects of the built-in filler are utilized to further strengthen the dispersion and dissolution of the polymer, thereby obtaining a uniform polymer solution. The obtained polymer solution can be directly pumped into the on-site injection pipeline for on-site injection operations.

[0031] In the above-mentioned rapid polymer dissolution device, polymer samplers are provided on the outlet pipes of the forced stretching system and the strong dispersion system to facilitate monitoring of the polymer solution quality during the production process.

[0032] The present invention adopts a skid-mounted design, and all equipment is combined into one skid, which has a compact structure, small footprint, and convenient transportation. It adopts the design concept of "one tube, one line" and is easy to use on site.

[0033] The forced stretching system of the present invention adopts a multi-stage toothed disc for forced stretching, and the toothed disc spacing and rotation speed are adjustable, which reduces the size of the equipment while further improving the stretching effect.

[0034] The present invention uses the forced stretching and strong dispersion systems in series, which further enhances the dissolution effect and significantly reduces the dissolution time. After treatment, a uniform polymer solution is directly obtained, which can be directly connected to the production injection system; the maturation tank is completely abandoned, which greatly reduces the floor space.

[0035] The intelligent control system of the present invention can realize automatic and stable operation of the device and intelligently adjust the processing volume of the polymer according to on-site needs, so as to achieve the goal of dispensing only as much as needed without occupying any storage space. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the overall structure of the polymer rapid dissolution device of the present invention.

[0037] The marks in the figure are as follows:

[0038] 1-Intelligent control system; 2-Screw feeding system; 3-Spray water-powder mixing system; 4-Forced stretching system; 5-Strong dispersion system; 6-Transfer pump; 7-Discharge pump; 8-Electric regulating valve B; 9-Flow meter; 10-Ball valve; 11-Sampler. DETAILED DESCRIPTION

[0039] The present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

[0040] like Figure 1 As shown, it is a schematic structural diagram of the intelligent skid-mounted polymer rapid dissolution device provided by the present invention, which includes an intelligent control system 1, a spiral feeding system 2, a spray water-powder mixing system 3, a forced stretching system 4, a strong dispersion system 5 and corresponding pipes, valves, pumps, etc. All the equipment are combined into a skid.

[0041] like Figure 1 As shown, the intelligent control system 1 integrates a power supply system, a safety system, a touchscreen display / control system, a PLC, a frequency conversion system, and a signal transmission system. The power supply system controls the on / off function of all devices and distributes power from an external platform to each device as needed. The safety system ensures operational safety and automatically takes measures such as stopping feeds and issuing alarms if a problem occurs to ensure safety. The touchscreen display / control system integrates both display and control, visually displaying all operating parameters on a flow chart while enabling the modification of relevant control parameters, enhancing the device's adaptability. The PLC processes signals from the control system and signal transmission system and transmits control signals to the frequency conversion system based on set conditions. The frequency conversion system controls all variable-frequency motors within the device, adjusting the appropriate speed based on PLC signals. The signal transmission system collects signals from all instrumentation within the device, communicates with the external production site, and transmits the collected information to the PLC. The coordinated operation of these six systems enables intelligent control of the device, such as fully automatic and stable operation, automatic adjustment of the prepared solution volume and concentration based on site needs, and adaptability to the preparation of a variety of polymer solutions after parameter changes. All the above systems are placed in explosion-proof cabinets to meet the requirements of oil field on-site use.

[0042] like Figure 1 As shown, the screw feeding system 2 includes a precision screw feeder and a hopper, which is responsible for feeding the polymer powder. Among them, the hopper can meet the production consumption of 4 to 8 hours according to the concentration of the prepared solution, and it is only necessary to feed the hopper regularly during the operation of the device. Preferably, the precision screw feeder is equipped with a variable frequency explosion-proof motor (speed 0 to 2850rpm adjustable), and its speed is linked to the prepared water flow through the PLC to achieve automatic adjustment under different flow rates to ensure the consistency of the concentration of the polymer solution. The precision screw feeder can be calibrated with different types of polymers (polymers include but are not limited to AP-P4, heavy oil activator, etc.), and the calibration equation is input into the control system. It is necessary to select and confirm according to the requirements before the device is operated.

[0043] like Figure 1As shown, the polymer water is connected through the device interface, and the pipeline is equipped with an electric regulating valve 8 and a flow meter 9. The processing capacity of the device is controlled by the interlocking of the signals of the two, and the processing capacity can be automatically adjusted by the signal of the production site. Preferably, the processing capacity of the skid-mounted polymer rapid dissolution device of the present invention can reach 5 to 20m 3 / h.

[0044] like Figure 1 As shown, the spray gouache mixing system 3 first uses an annular nozzle to form a mist of the prepared water, which then fully contacts the polymer powder, improving the mixing effect and effectively preventing agglomeration. Preferably, a liquid level gauge is installed in the mixing chamber of the spray gouache mixing system 3. Its value is linked to the speed of the material transfer pump to control the liquid level in the chamber and ensure stable operation of the device.

[0045] like Figure 1 As shown, the series-connected secondary forced stretching system 4 adopts a multi-stage toothed disc, so that the water-powder mixture is sequentially mixed, coarsely ground, finely ground, etc. when passing through, which destroys the hydration layer on the surface of the polymer powder while forcibly stretching the polymer chain segments, significantly enhancing the dissolution effect and greatly shortening the dissolution time. The solution after forced stretching is pumped into the subsequent strong dispersion system 5. Preferably, the number of toothed discs is 2 to 4, the number of teeth gradually increases from the inside to the outside, and the flow channel cross-section gradually becomes smaller. Specifically, the treatment of level 1 or level 2 can be selected according to the properties of the polymer. Preferably, the spacing between the toothed discs is adjustable from 0.5 to 5 mm. Preferably, the system is equipped with a variable frequency explosion-proof motor (speed adjustable from 0 to 2850 rpm), and the speed is adjusted according to the properties of the polymer.

[0046] like Figure 1 As shown, the powerful dispersion system 5 utilizes the dispersive action of the powerful dispersion field to significantly enhance the solid-liquid mass transfer coefficient. Simultaneously, the interception and stretching effects of the device's built-in filler further enhance the dispersion and dissolution of the polymer, thereby producing a uniform polymer solution. The resulting polymer solution is directly pumped into the on-site polymer injection pipeline for on-site polymer injection operations. Preferably, a liquid collection tank is located at the bottom of the powerful dispersion system, with a liquid level gauge installed within the tank, interlocked with the speed of the discharge pump 7.

[0047] like Figure 1 As shown, samplers 11 are provided on the outlet pipelines of the forced stretching system 4 and the strong dispersion system 5 to facilitate monitoring of the quality of the polymer solution during the production process.

[0048] The intelligent skid-mounted polymer rapid dissolution device of the present invention is used to rapidly dissolve functional polymers:

[0049] The functional polymer used is a heavy oil activator represented by formula I (prepared according to the method described in the following literature (Zhang Jian, Hua Chao, Zhu Yuejun, et al. Performance of high molecular weight activator and its effect on disassembly, viscosity reduction and desorption of heavy oil [J]. China Offshore Oil and Gas, 2018, 30(4):93-101.)

[0050]

[0051] (1) An intelligent control system 1 is used to automatically control the polymer water delivery and polymer powder feeding process: the polymer powder is placed in a hopper and conveyed to the mixing chamber of the spray water-powder mixing system 3 via a precision screw feeder. At the same time, it is fully contacted with the water mist sprayed in through the nozzle to form a mother liquor. The target mother liquor concentration in the mixing chamber is set to 6000 mg / L.

[0052] (2) The initially mixed polymer solution enters the forced stretching system 4 for grinding treatment, with the stretching level set to level 1 and the rotation speed set to 2000 rpm.

[0053] (3) The mixed liquid after the stretching treatment is transported to the strong dispersion system 5 for redispersion treatment, and the speed of the dispersion module is 350 rpm.

[0054] (4) The polymer solution that has undergone forced stretching and strong dispersion processes was sampled, its viscosity was tested, and compared with the polymer viscosity under laboratory conditions. The results are shown in Table 1.

[0055] Among them, the indoor experimental test process is as follows:

[0056] According to the experimental procedures of Q / HS 2032-2018 "Performance Index Requirements and Evaluation Methods for Polymers for Offshore Oilfield Flooding", 30g of polymer was poured into 5L of water and stirred with an agitator (400 rpm) for 1 hour. The experiment was stopped after the solution was completely mixed and the viscosity was measured.

[0057] As can be seen from Table 1, the viscosity of the polymer prepared by the intelligent polymer rapid dissolution device is similar to that of the conventional process, but the dissolution time is greatly shortened.

[0058] Table 1 Comparison of polymer dissolution effects

[0059]

Claims

1. A skid-mounted polymer rapid dissolution device, including a control system, a spiral feeding system, a spray water-powder mixing system, a forced stretching system, and a strong dispersion system; The spray water-powder mixing system includes a mixing chamber, wherein a nozzle is provided in the mixing chamber for forming the mixed water into a mist; The discharge port of the spiral feeding system is arranged at the upper part of the mixing chamber of the spray water-powder mixing system, so as to transport the polymer dry powder into the mixing chamber and contact the polymer dry powder with the water mist sprayed from the nozzle; The outlet of the mixing chamber is connected to the forced stretching system and the strong dispersion system in sequence to respectively perform forced stretching and dispersion on the polymer; The control system is respectively connected to the spiral feeding system, the spray water-powder mixing system, the forced stretching system and the strong dispersion system; The control system includes a power supply system, a safety system, a PLC receiving touch screen control system, a PLC, a frequency conversion system and a signal transmission system; The PLC receives signals from the touch screen control system and the signal transmission system and transmits them to the frequency conversion system after processing; The frequency conversion system controls the frequency conversion motor of the polymer rapid dissolution device and adjusts the appropriate speed according to the signal of the PLC; The signal transmission system collects instrument signals from the polymer rapid dissolution device and transmits them to the PLC; The forced stretching system includes a multi-stage gear disc; The multi-step gear disc has 2 to 4 steps, the number of teeth increases gradually from the inside to the outside, and the flow channel cross section gradually decreases; The powerful dispersion system is provided with a powerful disperser and fillers.

2. The polymer rapid dissolution device according to claim 1, characterized in that: The screw feeding system includes a screw feeder and a hopper; The screw feeder is connected to a variable frequency explosion-proof motor, and its rotation speed is linked to the distribution water flow through the PLC to achieve automatic adjustment under different flow rates.

3. The polymer rapid dissolution device according to claim 1 or 2, characterized in that: The nozzle is connected to a distribution water delivery pipeline, on which an electric regulating valve and a flow meter are provided. The processing volume of the polymer rapid dissolution device is controlled by interlocking the electric regulating valve and the flow meter signal.

4. The polymer rapid dissolution device according to claim 1 or 2, characterized in that: The forced stretching system adopts a two-stage series design, and the spacing between the toothed discs is 0.5-5 mm.

5. The polymer rapid dissolution device according to claim 1 or 2, characterized in that: Polymer samplers are provided on the outlet pipelines of the forced stretching system and the strong dispersion system.

6. Use of the polymer rapid dissolution device according to any one of claims 1 to 5 in preparing a polymer solution.

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