A disposable kit for measuring scale formation of oil and gas field produced water / reinjection water

Abstract

The present application belongs to the technical field of oil and gas field produced water / reinjection water treatment and detection, and particularly relates to a one-time kit for measuring the scale amount of oil and gas field produced water / reinjection water, comprising: a shell comprising a first shell and a second shell connected by a hinge; a reaction mechanism for containing sampling water and reacting the sampling water with an added reagent; a coarse filtration mechanism located at the liquid outlet end of the reaction mechanism; a scale formation mechanism in communication with the coarse filtration mechanism, the scale formation mechanism sucking the liquid in the coarse filtration mechanism by negative pressure and heating the liquid to form scale; a fine filtration mechanism located at the liquid outlet end of the scale formation mechanism; a waste liquid collection mechanism in communication with the fine filtration mechanism, the waste liquid collection mechanism sucking the liquid in the fine filtration mechanism by negative pressure; and an evaporation and weighing mechanism for heating the fine filtration mechanism and weighing the heated fine filtration mechanism. The present application can quickly, conveniently and at low cost measure the scale amount of oil and gas field produced water / reinjection water on site.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas field produced water / reinjection water treatment and testing technology, and particularly relates to a disposable kit for determining the amount of scaling in oil and gas field produced water / reinjection water. Background Technology

[0002] Produced water / reinjection water from oil and gas fields is oily wastewater generated during crude oil extraction in oilfield development. Its composition is complex, containing large amounts of calcium, magnesium, carbonate, and sulfate ions. During extraction, transportation, treatment, and reinjection, scaling easily occurs due to temperature and pressure changes and water quality fluctuations. Scaling can clog oil pipelines, equipment lines, and formation pores, exacerbating under-scale corrosion, reducing extraction efficiency, increasing equipment wear and maintenance costs, and in severe cases, affecting normal oil and gas field production. Therefore, accurate and rapid measurement of the scaling amount in produced water / reinjection water is of great significance for optimizing produced water / reinjection water treatment processes, selecting scale inhibitors, and preventing scaling.

[0003] Currently, the determination of scale formation in produced water / reinjection water from oil and gas fields mainly employs the laboratory gravimetric method. This method involves bringing produced water samples back to the laboratory, pre-treating them to remove impurities such as oil and suspended solid particles, allowing them to stand at a constant temperature for 72 hours, filtering, drying, and weighing, and then calculating the mass difference of the scale to obtain the scale amount. This method suffers from drawbacks such as high reliance on laboratory testing, long testing times, inability to obtain results quickly, and the tendency for scale crystals to adhere to the bottle walls, leading to underestimation of the measured values. Existing technologies often utilize large-scale laboratory equipment, such as the device disclosed in CN115407012B for determining the scale formation in produced water and predicting scale types. This device uses a pipeline system and laboratory testing components, making it bulky and heavy, and impossible to transport to the oilfield. Furthermore, such devices are complex to operate, requiring specialized technicians, and have long testing cycles, typically requiring 24-48 hours to obtain results, failing to meet the needs of rapid on-site testing in oil and gas fields.

[0004] In addition, there are some existing solutions related to oilfield wastewater testing. For example, CN119643238A discloses an evaluation method for scale inhibitors in oilfield produced water, which is mainly used to evaluate the scale inhibitor effect of the scale inhibitor, rather than directly measuring the amount of scale, and it does not have a reagent kit structure. CN105021783A discloses an oilfield wastewater scaling rate testing device, which uses parallel test pipe sections and test piece installers. It is a non-disposable device with high cost and cumbersome operation procedures, and it also cannot achieve rapid and convenient on-site testing.

[0005] Therefore, a disposable kit for measuring scale formation in produced / reinjected water from oil and gas fields needs to be designed to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a disposable kit for measuring scale formation in produced water / reinjection water of oil and gas fields, which can quickly, conveniently, and at low cost determine the scale formation in produced water / reinjection water of oil and gas fields on-site.

[0007] To achieve the above objectives, the present invention provides the following solution: a disposable kit for determining the scaling amount in produced / reinjected water of oil and gas fields, comprising: The housing includes a hinged first housing and a second housing; A sealing part is provided at the opening end where the first housing and the second housing are fastened together; A reaction mechanism, disposed within the housing, is used to hold the sampled water and cause the sampled water to react with the added reagent; A coarse filtration mechanism is disposed inside the housing and is located at the liquid outlet end of the reaction mechanism; A scaling mechanism is disposed inside the housing and is connected to the coarse filtration mechanism. The scaling mechanism draws liquid from the coarse filtration mechanism through negative pressure and heats the liquid to cause scaling. A fine filtration mechanism is disposed inside the housing and is located at the liquid outlet end of the scaling mechanism; A waste liquid collection mechanism is disposed inside the housing and is connected to the fine filtration mechanism. The waste liquid collection mechanism draws liquid from the fine filtration mechanism by negative pressure. An evaporation weighing mechanism is disposed inside the outer casing. The evaporation weighing mechanism is used to heat the fine filtration mechanism and weigh the heated fine filtration mechanism.

[0008] Preferably, the reaction mechanism includes a sampling tank and a reaction tank arranged side by side, the height of the sampling tank being higher than the height of the reaction tank, a first guide plate being detachably installed on the sidewalls of the sampling tank and the reaction tank that are close to each other, and a second guide plate and a first liquid outlet pipe being provided on the sidewall of the reaction tank away from the sampling tank, the second guide plate and the first liquid outlet pipe corresponding to each other.

[0009] Preferably, the coarse filtration mechanism includes a first mounting base, which is fixedly disposed inside the housing. A first filter funnel is detachably mounted on the top of the first mounting base. The first filter funnel is located below the first liquid outlet pipe. A first guide pipe is fixedly connected to the bottom of the first mounting base, and the first guide pipe is connected to the scaling mechanism.

[0010] Preferably, the scaling mechanism includes a heating tank, which is connected to the first guide pipe. A heating plate is provided at the bottom of the heating tank, and a first sealing cover is detachably installed at the top of the heating tank. A first negative pressure pump is provided on the first sealing cover, and a second liquid outlet pipe is fixedly connected to the side wall of the heating tank.

[0011] Preferably, the fine filtration mechanism includes a second mounting base, which is fixedly disposed inside the housing. A second filter funnel is detachably mounted on the top of the second mounting base. The second filter funnel is located below the second liquid outlet pipe. The second mounting base is fixedly connected to a second guide pipe, which is connected to the waste liquid collection mechanism.

[0012] Preferably, the waste liquid collection mechanism includes a liquid storage tank, which is fixedly installed inside the outer shell. The liquid storage tank is fixedly connected to the second guide pipe. A second sealing cover is detachably installed on the top of the liquid storage tank, and a second negative pressure pump is provided on the second sealing cover.

[0013] Preferably, the evaporation weighing mechanism includes an evaporation chamber, which is fixedly disposed inside the outer casing.

[0014] Preferably, the sealing part includes two sealing strips, one of which is fixedly connected to the open end of the first housing, and the other of which is fixedly connected to the open end of the second housing.

[0015] Preferably, a battery and consumable storage compartment are fixedly provided inside the outer casing.

[0016] Preferably, the outer wall of the first housing is provided with a handle, and the outer wall of the second housing is provided with a latch, and the first housing and the second housing are fastened together by the latch.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects: This invention closely aligns with the thermodynamic and kinetic characteristics of scaling in produced / reinjected water from oil and gas fields. Through the synergistic effects of oil-fouling shielding, scaling induction, and isothermal acceleration, it effectively addresses the technical pain points of traditional testing methods, such as oil-fouling interference, insufficient reaction, and long testing cycles. Furthermore, it significantly improves testing accuracy, enabling the reagent kit's test results to accurately reflect the actual scaling potential of produced / reinjected water from oil and gas fields. This provides reliable data support for scale prevention and control, scale inhibitor selection, and water treatment process optimization in oilfields. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the entire invention. Figure 1 ; Figure 2This is a schematic diagram of the entire invention. Figure 2 ; Figure 3 This is a schematic diagram of the entire invention. Figure 3 .

[0020] The components are as follows: 1. First housing; 2. Second housing; 3. Sealing strip; 4. Handle; 5. Lock; 6. Sampling tank; 7. First guide plate; 8. Reaction tank; 9. Second guide plate; 10. First outlet pipe; 11. First mounting base; 12. First filter funnel; 13. Heating tank; 14. First sealing cover; 15. First negative pressure pump; 16. Heating plate; 17. First guide pipe; 18. Second outlet pipe; 19. Second mounting base; 20. Second filter funnel; 21. Liquid storage tank; 22. Second sealing cover; 23. Second negative pressure pump; 24. Evaporation chamber; 25. Battery; 26. Consumable storage tank. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figures 1 to 3 As shown, this invention provides a disposable kit for determining the scaling amount in produced water / reinjection water of oil and gas fields, comprising: The outer casing includes a hinged first casing 1 and a second casing 2; A sealing part is provided at the opening end where the first housing 1 and the second housing 2 are fastened together; The reaction mechanism, located inside the outer casing, is used to hold the sampled water and cause the sampled water to react with the added reagents. The coarse filtration mechanism is installed inside the housing and is located at the liquid outlet end of the reaction mechanism; The scaling mechanism is located inside the housing and is connected to the coarse filtration mechanism. The scaling mechanism draws liquid from the coarse filtration mechanism through negative pressure and heats the liquid to cause scaling. The fine filtration mechanism is housed inside the outer casing and is located at the liquid outlet end of the scaling mechanism; The waste liquid collection mechanism is located inside the outer casing and is connected to the fine filtration mechanism. The waste liquid collection mechanism draws liquid from the fine filtration mechanism through negative pressure. An evaporation weighing mechanism is installed inside the outer casing. The evaporation weighing mechanism is used to heat the fine filtration mechanism and weigh the heated fine filtration mechanism.

[0024] The scheme is further optimized. The reaction mechanism includes a sampling tank 6 and a reaction tank 8 arranged in parallel. The height of the sampling tank 6 is higher than that of the reaction tank 8. The side walls of the sampling tank 6 and the reaction tank 8 that are close to each other are detachably equipped with a first guide plate 7. The side wall of the reaction tank 8 that is away from the sampling tank 6 is equipped with a second guide plate 9 and a first liquid outlet pipe 10. The second guide plate 9 and the first liquid outlet pipe 10 correspond to each other.

[0025] The scheme is further optimized. The coarse filtration mechanism includes a first mounting base 11, which is fixedly installed inside the housing. A first filter funnel 12 is detachably installed on the top of the first mounting base 11. The first filter funnel 12 is located below the first liquid outlet pipe 10. A first guide pipe 17 is fixedly connected to the bottom of the first mounting base 11. The first guide pipe 17 is connected to the scaling mechanism.

[0026] The scheme is further optimized. The scaling mechanism includes a heating tank 13, which is connected to the first guide pipe 17. A heating plate 16 is provided at the bottom of the heating tank 13. A first sealing cover 14 is detachably installed at the top of the heating tank 13. A first negative pressure pump 15 is provided on the first sealing cover 14. A second liquid outlet pipe 18 is fixedly connected to the side wall of the heating tank 13.

[0027] The further optimized solution includes a second mounting base 19, which is fixedly installed inside the housing. A second filter funnel 20 is detachably installed on the top of the second mounting base 19. The second filter funnel 20 is located below the second liquid outlet pipe 18. A second guide pipe is fixedly connected to the second mounting base 19 and is connected to the waste liquid collection mechanism.

[0028] The scheme is further optimized. The waste liquid collection mechanism includes a liquid storage tank 21, which is fixedly installed inside the outer shell. The liquid storage tank 21 is fixedly connected to the second guide pipe. A second sealing cover 22 is detachably installed on the top of the liquid storage tank 21, and a second negative pressure pump 23 is installed on the second sealing cover 22.

[0029] The scheme has been further optimized. The evaporation weighing mechanism includes an evaporation chamber 24, which is fixedly installed inside the outer shell.

[0030] The design is further optimized so that the sealing part includes two sealing strips 3. One sealing strip 3 is fixedly connected to the open end of the first housing 1, and the other sealing strip 3 is fixedly connected to the open end of the second housing 2.

[0031] The design has been further optimized, with a battery 25 and a consumable storage slot 26 fixedly installed inside the casing.

[0032] In a further optimized design, a handle 4 is provided on the outer wall of the first housing 1, and a latch 5 is provided on the outer wall of the second housing 2. The first housing 1 and the second housing 2 are fastened together by the latch 5.

[0033] The first filter funnel 12 is an oleophilic 0.45μm standard filter cup, used to adsorb and remove oil stains from water samples and retain large suspended impurities; the second filter funnel 20 is a hydrophilic 0.45μm integrated standard quantitative filter cup, used to accurately retain fine scale crystal particles generated after the reaction; the heating tank 13 is equipped with a first negative pressure pump 15, and the liquid storage tank 21 is equipped with a second negative pressure pump 23, forming a two-stage negative pressure accelerated filtration structure, which greatly improves the filtration rate and avoids the problems of slow filtration and impurity retention; the second shell 2 has a built-in rechargeable battery 25, and the entire machine is independently powered by its own battery 25, without the need for external mains power or battery replacement, making it suitable for continuous operation in the field without power; the evaporation chamber 24 is a closed constant temperature drying and weighing integrated unit. The cavity integrates a micro-drying module, a high-precision weighing sensor, and a data display module, enabling in-situ drying, dehydration, and automatic weighing of the quantitative filter cup and scale, eliminating the need for external drying equipment and an external balance. The consumable storage tank 26 stores a pre-packaged standard reagent consumable package, which is a standardized and universal finished product containing a scale inducing agent, pH buffer solution, oil shielding agent, and a first filter funnel 12 and a second filter funnel 20. Each component is independently and standardizedly packaged, and can be used independently for laboratory static scale determination. The second filter funnel 20 can be disassembled and moved into the evaporation chamber 24 to complete drying and weighing. It also includes a disposable weighing spoon and a constant temperature heating element, which is powered by a built-in battery 25.

[0034] The scale-forming inducer is anhydrous sodium carbonate powder, with a dosage of 0.5-1.0g per packet; the pH buffer is a borax-boric acid buffer solution with a pH of 8.5-9.5, with a dosage of 5-10mL per packet; and the oil-stain shielding agent is a nonionic surfactant solution, with a dosage of 2-3mL per packet.

[0035] The second filter funnel 20 replaces the traditional quantitative filter paper and filter bag. The second filter funnel 20 is an integrated sealed filter structure with a precise pore size of 0.45μm. Its hydrophilic properties ensure rapid water sample penetration and complete interception of fine scale. It is pre-dried to constant weight at 105℃ before leaving the factory and is marked with a unique initial mass parameter. It can be directly used for accurate differential weighing without leakage or scale loss.

[0036] The sampling tank 6 is equipped with graduation lines, with a range of 0-50mL and an accuracy of 1mL; the reaction tank 8 is equipped with a sealing cap, and a sealing gasket is provided on the inside of the sealing cap.

[0037] The heating temperature of the constant temperature heating element is adjustable, with an adjustment range of 40-60℃. The heating time can be preset to 1-2 hours, and the power is automatically cut off after heating is completed. The battery 25 built into the second housing 2 provides power to the constant temperature heating element, the first negative pressure pump 15, the second negative pressure pump 23, the evaporation chamber 24, and the weighing sensor module throughout the process. It supports repeated charging and cyclic use, eliminating the limitations of external power supply and disposable batteries, and is suitable for field operations without power grids.

[0038] It also includes disposable gloves and instructions, which describe the operating steps, precautions, and methods for calculating the amount of scale buildup.

[0039] The overall dimensions of the outer shell are 15cm × 10cm × 5cm, and the weight does not exceed 200g.

[0040] The evaporation chamber 24 is a sealed, heat-insulated integrated chamber that integrates a miniature constant-temperature drying module, a high-precision weighing sensor, and a digital display calculation module. The miniature constant-temperature drying module outputs a constant weight temperature of 105℃, which is a national standard temperature, to thoroughly remove moisture adsorbed by the quantitative filter cup and scale. The high-precision weighing sensor has an accuracy of 0.0001g, matching the detection accuracy of a laboratory analytical balance of 0.0001g. The digital display calculation module can automatically read the initial mass and the total mass after drying, and calculate the difference to output the net mass of the scale and precipitate, realizing in-situ drying, constant weight, accurate weighing, and automatic weight calculation in one integrated operation, without the need for an external balance or drying equipment.

[0041] This invention adopts an integrated, disposable design, requiring no external large equipment. It is small in size, lightweight, and easy to carry, and can be directly taken to the oil and gas field for use, solving the pain point that existing measuring devices cannot perform on-site testing. Pre-packaged reagent kits eliminate the need for on-site reagent preparation. They are labeled with dosage scales, making them easy to operate. No professional technicians are required; ordinary workers can complete the operation by following the instructions, thus lowering the operational threshold. The device integrates sampling, reaction, filtration, drying, and weighing into a single unit. With built-in constant temperature reaction heating, built-in 105℃ constant weight drying, and built-in high-precision weighing module, the scale content can be measured in 1.5-2 hours without any external instruments or equipment, which greatly shortens the measurement cycle and solves the problems of long time consumption and high equipment dependence of existing technologies. Made of disposable materials, it is inexpensive, with a single set costing ≤50 yuan. Compared with existing laboratory equipment and non-disposable testing equipment, it significantly reduces testing costs and is suitable for large-scale on-site promotion and use. Featuring a differentiated dual-stage 0.45μm negative pressure filtration system, this system offers precise, interference-resistant, and highly efficient purification, suitable for mass production. The first-stage oleophilic filter cup focuses on removing oil and coarse impurities, achieving pre-purification of water samples. The second-stage hydrophilic quantitative filter cup precisely traps fine scale crystals, ensuring no leakage or scale loss. The dual-stage independent negative pressure filtration structure completely solves the problems of slow flow rates and easy clogging of natural filtration membranes, making it suitable for complex produced water conditions with high oil content and high impurities in oil and gas fields. Furthermore, both filter cups and the matching reagent kit are industry-standard, universal consumables with uniform specifications and strong interchangeability. They are compatible with static scaling detection methods in laboratories, enabling a single set of consumables for dual-scenario applications, suitable for mass production and market-oriented use.

[0042] It is compatible with various oil and gas field produced water / reinjection water scenarios and can be widely used for rapid detection of scale in produced water and reinjection water at oil and gas field development sites, along oil pipelines, and in water treatment stations. It provides timely and accurate data support for scale prevention and control in oil and gas fields, optimization of water treatment processes, and evaluation of reinjection water quality.

[0043] The core mechanism for determining scale buildup in this invention is based on a combination of ion reaction-induced and gravimetric methods. This precisely matches the inherent characteristics of scale buildup in produced / reinjected water from oil and gas fields, enabling rapid and accurate quantification of scale buildup. Scale buildup in produced water from oil and gas fields is a multi-component mixed scale system composed of carbonates, sulfates, barium strontium salts, and silicates, containing Ca... 2+ Mg 2+ Ba 2+ 、Sr 2+ To address the issue of scale-forming ions such as silicates, and to ensure accurate detection under real-world conditions, this invention specifically optimizes the detection mechanism, avoiding detection controversies arising from mixed scale types. The specific scientific mechanism is as follows: In the high-temperature and high-pressure environment of oil and gas field produced water / reinjection water in the well formation, some sulfates, barium strontium salts, and silica scale have already undergone static precipitation. However, during the production water lifting and transportation process, pressure reduction, temperature changes, and pH fluctuations lead to the continuous formation of residual active calcium, magnesium, barium, strontium, and silica ions, which is the core cause of pipeline blockage and equipment scaling. New scale formation in surface gathering, pipeline transportation, and water treatment equipment is mainly composed of carbonate scale, accompanied by trace amounts of barium strontium sulfate and silicate scale. This invention induces the release of all active calcium, magnesium, barium, and strontium ions in the system through the addition of carbonate ions. Combined with water quality stabilization and impurity purification mechanisms, it effectively locks in the total active scale-forming substances in the water. The total precipitate mass accurately characterizes the "actual comprehensive new scale formation potential" of the extracted water, enabling a comprehensive assessment of the scaling risk in on-site pipeline operations. This invention comprises several core components: 1. Oil Sludge Shielding Mechanism: Floating oil and emulsified oil in produced / reinjected water from oil and gas fields easily adsorb onto the surface of the filter membrane, leading to an inflated weighing result and interfering with the accurate calculation of scale buildup. The nonionic surfactant (oil sludge shielding agent) used in this kit has hydrophobic groups that specifically adsorb oil molecules in produced / reinjected water, forming a thermodynamically stable micelle structure. This allows the oil to be dispersed in suspension in the aqueous solution, preventing it from adhering to the surface of the 0.45μm quantitative filter membrane. Simultaneously, this nonionic surfactant does not react with Ca in the produced water. 2+ Mg 2+ CO3 2- The plasma undergoes a chemical reaction that does not affect the thermodynamic balance of the scaling reaction, thus effectively eliminating the interference of oil on the measurement results and ensuring weighing accuracy.

[0044] 2. Scaling Induction Mechanism: Under natural conditions, CO3 in oil and gas field produced water / reinjection water... 2- At low concentrations, Ca 2+ Mg 2 + With CO3 2- The ion product of the insoluble carbonate is less than the solubility product (Ksp) of the corresponding sparingly soluble carbonate, resulting in a slow and incomplete scaling reaction rate, which cannot meet the requirements for rapid on-site testing. The scale inducer (anhydrous sodium carbonate powder) in this kit, after dissolving in produced / reinjected water, can rapidly dissociate and release sufficient CO3. 2- , so that Ca in the system 2+ Mg 2+ With CO3 2- The ion product of CaCO3 is much greater than that of CaCO3 and MgCO3, promoting the precipitation reaction (CaCO3). 2+ +CO3 2- =CaCO3↓、Mg 2+ +CO3 2- =MgCO3↓) occurs rapidly; simultaneously, the pH buffer (borax-boric acid buffer) can stabilize the pH of the reaction system at 8.5-9.5, and this pH range can significantly inhibit CO3. 2- Hydrolysis reaction (CO3) 2- +H2O⇌HCO3 - +OH - Maintaining CO3 in the system 2- Stable concentration ensures a full and thorough scaling reaction, avoiding deviations in scaling measurement caused by pH fluctuations.

[0045] 3. Isothermal Acceleration Mechanism: Temperature is a key factor affecting the scaling reaction kinetics of produced / reinjected water in oil and gas fields. According to the Arrhenius equation, increased temperature can significantly accelerate ion diffusion rates, reduce the activation energy of precipitation reactions, and promote the nucleation and growth of insoluble carbonate precipitates. This invention precisely adapts to the logic of oilfield operating conditions, avoiding deviations in mixed scale detection: sulfate scale has extremely low solubility and irreversible precipitation reactions, with no dynamic precipitation changes under surface conditions, thus not affecting the evaluation of scaling potential; while carbonate scale is extremely sensitive to temperature, pressure, and pH, and is the core cause of dynamic scaling and pipeline blockage in the field. The thermostatic heating element in this kit can precisely control the reaction temperature between 40-60℃. This temperature range is consistent with the actual temperature range during the extraction and transportation of produced water / reinjection water in oil and gas fields. It can not only realistically simulate the scaling environment on site, but also shorten the scaling reaction cycle from 24-72 hours in traditional laboratory methods to 1.5-2 hours, enabling rapid on-site measurement. At the same time, the heating time can be preset to ensure that the scaling reaction reaches thermodynamic equilibrium, avoiding low measurement results due to incomplete reaction, and further ensuring the accuracy of the test data.

[0046] 4. Mechanism for Detecting Multi-component Mixed Scale: This invention does not solely detect carbonate scale, but rather targets the "calcium, magnesium, barium, strontium, and silicon multi-component scale-forming system" in produced water / reinjection water from oil and gas fields, achieving an equivalent evaluation of scale potential. (The text abruptly shifts to a seemingly unrelated topic about calcium and barium scale formation in produced water.) 2+ Mg 2+ Ba 2+ 、Sr 2+ As common precursor ions for carbonate and sulfate scale, silicate is the core precursor ion for silica scale. The total amount of all active scale-forming ions in the water directly determines the final total scale buildup. This invention forces the precipitation of all active calcium, magnesium, barium, and strontium ions through excess carbonate ions, while simultaneously relying on a stable pH system to inhibit the disordered precipitation of silica colloids. Only condition-responsive newly formed scale is counted, and its total precipitate mass can equivalently replace the overall scale risk of produced water / reinjection water. Trace amounts of native formation sulfate scale and stable silica scale do not participate in dynamic new scale formation and will not affect pipeline blockage; therefore, they are not included in the detection statistics. This detection logic fully conforms to the general standards for scale evaluation in the oil and gas field industry, is suitable for complex operating conditions where calcium and magnesium scale, barium and strontium scale, and silica scale coexist, and the detection results have strong engineering validity and scientific validity.

[0047] Example 1: A disposable reagent kit for measuring scale buildup in produced / reinjected water from oil and gas fields includes a disposable shell, a pre-packaged reagent pack, a high-precision filter assembly, and portable accessories.

[0048] The disposable shell is made of food-grade waterproof plastic, with overall dimensions of 15cm×10cm×5cm and a weight of 180g. The interior is integrally molded and divided into a sampling area, a reaction area, a filtration area, and a weighing area. The sampling area has graduations with a range of 0-50mL and an accuracy of 1mL. The reaction area has a sealing cap with a silicone sealing gasket on the inside. There are tear-away flow channels between the sampling area and the reaction area, between the reaction area and the filtration area, and between the filtration area and the weighing area. The width of the flow channels is 1cm. The bottom of the weighing area has a rubber anti-slip pad to prevent the reagent kit from sliding during weighing.

[0049] The pre-packaged reagent kit includes a scale inducer, a pH buffer solution, and an oil shielding agent. The scale inducer is anhydrous sodium carbonate powder, with each package containing 0.8g, and is individually packaged in an aluminum foil bag. The pH buffer solution is a borax-boric acid buffer solution with a pH of 9.0, with each package containing 8mL, and is also individually packaged in an aluminum foil bag. The oil shielding agent is a nonionic surfactant (polyoxyethylene octylphenol ether) solution with a concentration of 5%, with each package containing 2.5mL, and is also individually packaged in an aluminum foil bag. The corresponding reagent name and dosage scale are marked on the surface of each of the three aluminum foil bags.

[0050] The high-precision filter component is a detachable, hydrophilic, 0.45μm integrated standard quantitative filter cup. The filter membrane is made of hydrophilic modified PES material with a precise pore size of 0.45μm. The integrated cup body has a sealed filtration structure with no side leakage gaps or dead corners. The hydrophilic filter membrane can quickly allow water to pass through and completely trap multi-element micro-fine scale crystal particles. The filter cup is detachable and can be moved out horizontally. It is pre-dried at 105℃ to constant weight at the factory and the initial mass is marked (accurate to 0.0001g), which is suitable for in-situ drying and precise weighing operations. The sample pretreatment zone incorporates an oleophilic 0.45μm standard filter cup. The filter membrane is made of oleophilic MCE material, and the cup is transparent with graduations, with a capacity of 100–250mL. It can specifically adsorb floating oil and emulsified oil in water samples, while efficiently retaining coarse suspended particles, colloids, and corrosion products ≥0.45μm, achieving simultaneous removal of oil and large particulate impurities and purifying the water sample to be reacted. Both the sample pretreatment zone and the filtration zone incorporate a miniature disposable negative pressure filtration structure. Through negative pressure suction, the filtrate penetration rate is accelerated, solving the problems of slow flow rate, impurity retention, and easy clogging of the filter membrane in natural filtration, achieving two-stage rapid and efficient filtration. The above two-stage filter cups and the reagent kit are all industry-standard finished consumables with uniform specifications and strong versatility. They can be used directly in the laboratory for static scaling determination without the main kit.

[0051] Portable accessories include a disposable plastic weighing spoon (0-1g range, 0.01g accuracy), a constant temperature heating element, a built-in charging module, a miniature negative pressure filtration module, disposable gloves, and an instruction manual. The constant temperature heating element is attached to a pre-set limiting slot at the bottom of the reaction zone, ensuring precise positioning and a tight fit. It is independently powered by the device's built-in charging energy storage module, allowing for repeated charging and use. The heating temperature is adjustable (40-60℃), and the heating time can be preset (1-2 hours). It automatically shuts off after heating is complete. The built-in charging module integrates a Type-C standard charging interface, a charging protection chip, and an overvoltage and overcurrent protection module, making it compatible with regular mobile phone chargers and power banks. Charging is safe and stable, meeting the needs of field use. The miniature negative pressure filtration module integrates a miniature silent negative pressure air pump, a negative pressure regulating valve, an air guide pipe, and a filter cup sealing bracket, providing stable negative pressure filtration power for the two-stage filtration system. The instruction manual details the operating steps, precautions, and methods for calculating scale buildup, while also indicating the laboratory compatibility specifications for standardized consumables and the maintenance specifications for the finished equipment.

[0052] The reagent kit used in this embodiment is as follows: This device is powered independently by its built-in charging device, and all consumables are standardized, universal finished products, suitable for both on-site rapid testing and laboratory static testing scenarios. The specific operating steps are as follows: 1. Sampling: Open the sampling area of ​​the disposable shell, use the sampling tool to measure 40mL of produced water / reinjection water sample from the oil and gas field, and inject it into the sampling area to ensure that the sample is free of obvious impurities and a large amount of floating oil; 2. Oil Stain Removal and Reagent Addition: Tear open the guide channel between the sampling area and the reaction area to introduce a quantitative amount of collected water sample into the reaction area; open the individual packaging of the oil stain shielding agent, pour the quantitative amount of oil stain shielding agent into the reaction area, tighten the sealing cap, shake thoroughly for 1 minute, and let stand for 5 minutes to complete the dispersion and shielding treatment of oil stains in the water sample, preventing subsequent interference from oil stains to the scaling reaction and filtration weighing. Subsequently, add a quantitative amount of pH buffer solution and scaling inducer in sequence, seal again and shake well to ensure that all reagents are completely dissolved, and construct a stable scaling reaction system.

[0053] 3. Water sample pretreatment negative pressure filtration: Tear open the corresponding guide channel to introduce the water sample from the reaction zone into the oleophilic 0.45μm filter cup in the sample pretreatment zone. Start the micro negative pressure filtration system in the pretreatment zone to quickly intercept coarse suspended particles, colloidal impurities and free oil in the water sample, complete the pre-purification of the water sample, and obtain a pure reaction solution without impurities and oil, thus avoiding the interference of native water quality impurities on the scaling reaction from the source.

[0054] 4. Constant Temperature Scaling Induction Reaction: After pretreatment, turn on the constant temperature heating element at the bottom of the reaction zone. Set the constant temperature in the range of 40-60℃ according to the actual water temperature conditions at the oilfield site, and preset the constant temperature duration to 1-2 hours. This accurately simulates the on-site produced water transportation and gathering environment, inducing all active scale-forming ions such as calcium, magnesium, barium, and strontium in the water to fully crystallize and precipitate, ensuring that the scaling reaction reaches thermodynamic equilibrium and fully restoring the comprehensive new scaling potential of the water body.

[0055] 5. Negative Pressure Fine Filtration and Solid-Liquid Separation of the Reaction Solution: After the constant temperature reaction is completed, the heating element is turned off, the guide groove between the reaction zone and the filtration zone is torn open, and the micro negative pressure filtration system in the filtration zone is activated to uniformly introduce the reacted mixture into a hydrophilic 0.45μm integrated quantitative filter cup. Relying on the negative pressure rapid filtration structure, solid-liquid separation is efficiently completed, completely retaining the carbonate, barium strontium salt, and silicate micro-scale crystals generated in the reaction, eliminating the problems of microcrystal leakage and scale loss.

[0056] 6. In-situ Drying and Precise Weighing: After filtration, the integrated quantitative filter cup containing the scale is carefully removed and horizontally placed into the sealed, insulated chamber of the weighing area. The sealing door is then closed. The built-in micro-drying module is activated, and the filter cup is dried at a standard temperature of 105℃ for 5–10 minutes to thoroughly remove free and adsorbed water from the surface of the filter cup and the scale, eliminating weighing errors caused by residual moisture. Once the equipment readings stabilize, the system automatically retrieves the factory-preset initial constant weight of the filter cup and accurately calculates the net weight of the scale deposits through difference calculation.

[0057] 7. Automatic data calculation: The system automatically calculates the amount of scale on the water sample according to the preset formula. The formula for calculating the amount of scale is: Scale amount (mg / L) = (Net mass of scale × 1000) / Sampling volume (mL). No manual calculation or reading is required, effectively avoiding human operation errors.

[0058] 8. Compliant waste disposal: After the test is completed, the disposable reagent kit shells, waste filter cups, residual waste liquid and various consumable wastes are collected and disposed of in strict accordance with the environmental protection operation specifications of the oilfield site. No equipment cleaning is required, and the operation is simple, green and compliant.

[0059] Example 2: A disposable reagent kit for determining scale formation in produced / reinjected water from oil and gas fields differs from Example 1 in that: each packet contains 0.5g of scale-inducing agent, 5mL of pH buffer solution (borax-boric acid buffer solution, pH=8.5), and 2mL of oil-smear shielding agent; the constant-temperature heating element is preset to a heating time of 2 hours, with the heating temperature adjusted to 40℃; both stages of the filter cups have a pore size of 0.45μm, with the pretreatment filter cup made of oleophilic material and the fine-filtration quantitative filter cup made of hydrophilic material; both stages are equipped with a negative pressure filtration system; the entire unit is powered independently by a built-in charging device, and all consumables are standardized, universal finished products, suitable for laboratory static scale detection; the disposable casing weighs 150g. This embodiment is suitable for low-temperature, low-scale-potential produced / reinjected water conditions in oil and gas fields, providing stable detection accuracy and enabling on-site testing of the entire process within 2 hours.

[0060] Example 3: A disposable reagent kit for determining scale formation in produced / reinjected water from oil and gas fields differs from Example 1 in that: each packet contains 1.0g of scale-inducing agent, 10mL of pH buffer solution (borax-boric acid buffer solution, pH=9.5), and 3mL of oil-shielding agent; the constant-temperature heating element has a preset heating time of 1 hour and a heating temperature adjusted to 60℃; both filter cups have a pore size of 0.45μm, with the pretreatment filter cup made of oleophilic material and the fine-filtration quantitative filter cup made of hydrophilic material, and both stages are equipped with a negative pressure filtration system; the entire unit is powered independently by a built-in charging device, and all consumables are standardized and universal finished products, suitable for laboratory static scale detection; the disposable shell weighs 200g. This embodiment is suitable for high-temperature, high-scale-rate produced / reinjected water conditions in oil and gas fields, significantly reducing testing time, achieving accurate testing within 1 hour, and is suitable for rapid inspection scenarios in oil fields.

[0061] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0062] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope of the present invention.

Claims

1. A disposable reagent kit for determining the scaling amount in produced water / reinjection water of oil and gas fields, characterized in that, include: The outer casing includes a hinged first casing (1) and a second casing (2); A sealing part is provided at the opening end where the first housing (1) and the second housing (2) are fastened together; A reaction mechanism, disposed within the housing, is used to hold the sampled water and cause the sampled water to react with the added reagent; A coarse filtration mechanism is disposed inside the housing and is located at the liquid outlet end of the reaction mechanism; A scaling mechanism is disposed inside the housing and is connected to the coarse filtration mechanism. The scaling mechanism draws liquid from the coarse filtration mechanism through negative pressure and heats the liquid to cause scaling. A fine filtration mechanism is disposed inside the housing and is located at the liquid outlet end of the scaling mechanism; A waste liquid collection mechanism is disposed inside the housing and is connected to the fine filtration mechanism. The waste liquid collection mechanism draws liquid from the fine filtration mechanism by negative pressure. An evaporation weighing mechanism is disposed inside the outer casing. The evaporation weighing mechanism is used to heat the fine filtration mechanism and weigh the heated fine filtration mechanism.

2. The disposable reagent kit for determining the scaling amount in produced water / reinjection water of oil and gas fields according to claim 1, characterized in that, The reaction mechanism includes a sampling tank (6) and a reaction tank (8) arranged side by side. The height of the sampling tank (6) is higher than that of the reaction tank (8). A first guide plate (7) is detachably installed on the side wall of the sampling tank (6) and the reaction tank (8) that are close to each other. A second guide plate (9) and a first liquid outlet pipe (10) are provided on the side wall of the reaction tank (8) away from the sampling tank (6). The second guide plate (9) and the first liquid outlet pipe (10) correspond to each other.

3. The disposable reagent kit for determining the scaling amount in produced water / reinjection water of oil and gas fields according to claim 2, characterized in that, The coarse filtration mechanism includes a first mounting base (11), which is fixedly disposed inside the housing. A first filter funnel (12) is detachably mounted on the top of the first mounting base (11). The first filter funnel (12) is located below the first liquid outlet pipe (10). A first guide pipe (17) is fixedly connected to the bottom of the first mounting base (11). The first guide pipe (17) is connected to the scaling mechanism.

4. The disposable reagent kit for determining the scaling amount in produced water / reinjection water of oil and gas fields according to claim 3, characterized in that, The scaling mechanism includes a heating tank (13), which is connected to the first guide pipe (17). A heating plate (16) is provided at the bottom of the heating tank (13). A first sealing cover (14) is detachably installed at the top of the heating tank (13). A first negative pressure pump (15) is provided on the first sealing cover (14). A second liquid outlet pipe (18) is fixedly connected to the side wall of the heating tank (13).

5. A disposable reagent kit for determining the scaling amount in produced water / reinjection water of oil and gas fields according to claim 4, characterized in that, The fine filtration mechanism includes a second mounting base (19), which is fixedly disposed inside the housing. A second filter funnel (20) is detachably mounted on the top of the second mounting base (19). The second filter funnel (20) is located below the second liquid outlet pipe (18). The second mounting base (19) is fixedly connected to a second guide pipe, which is connected to the waste liquid collection mechanism.

6. A disposable reagent kit for determining the scaling amount in produced water / reinjection water of oil and gas fields according to claim 5, characterized in that, The waste liquid collection mechanism includes a liquid storage tank (21), which is fixedly installed inside the outer shell. The liquid storage tank (21) is fixedly connected to the second guide pipe. A second sealing cover (22) is detachably installed on the top of the liquid storage tank (21), and a second negative pressure pump (23) is installed on the second sealing cover (22).

7. A disposable reagent kit for determining the scaling amount in produced water / reinjection water of oil and gas fields according to claim 1, characterized in that, The evaporation weighing mechanism includes an evaporation chamber (24), which is fixedly disposed inside the outer shell.

8. A disposable reagent kit for determining the scaling amount in produced water / reinjection water of oil and gas fields according to claim 1, characterized in that, The sealing part includes two sealing strips (3), one of which is fixedly connected to the opening end of the first housing (1), and the other of which is fixedly connected to the opening end of the second housing (2).

9. A disposable reagent kit for determining the scaling amount in produced water / reinjection water of oil and gas fields according to claim 1, characterized in that, The housing contains a battery (25) and a consumable storage compartment (26).

10. A disposable reagent kit for determining the scaling amount in produced water / reinjection water of oil and gas fields according to claim 1, characterized in that, The first housing (1) is provided with a handle (4) on its outer side wall, and the second housing (2) is provided with a latch (5) on its outer side wall. The first housing (1) and the second housing (2) are fastened together by the latch (5).

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