CN112961659B - Sinking type liquid delay foaming agent for gas production foam drainage and sand carrying - Google Patents
Sinking type liquid delay foaming agent for gas production foam drainage and sand carrying Download PDFInfo
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- CN112961659B CN112961659B CN202110172082.8A CN202110172082A CN112961659B CN 112961659 B CN112961659 B CN 112961659B CN 202110172082 A CN202110172082 A CN 202110172082A CN 112961659 B CN112961659 B CN 112961659B
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Abstract
The invention provides a sinking type liquid delayed foaming agent for gas production foam drainage and sand carrying, which solves the technical problem that in the prior art, a liquid foaming agent cannot disperse and sink in accumulated liquid, so that the concentration of an effective foaming agent in the middle or the bottom of the underground accumulated liquid is too low or even not high, and the drainage effect is seriously influenced. The preparation method comprises the following raw materials in percentage by weight: 60% -80% of nonionic surfactant; 4% -6% of fluorocarbon surfactant; 8% -10% of titanium dioxide; 0.1% -0.3% of xanthan gum; the balance of antifreeze solution. The invention can freely sink and delay foaming in the shaft effusion by a conventional pump injection construction mode, thereby improving the effective equivalent concentration of the foaming agent in the shaft effusion and achieving excellent foam discharging effect.
Description
Technical Field
The invention relates to the field of oilfield chemistry, in particular to a sinking type liquid delay foaming agent for gas production foam drainage and sand carrying.
Background
In the middle and later stages of development of the natural gas well, formation water enters a near-wellbore area or a wellbore along with natural gas, the flow rate of gas formation natural gas is gradually reduced along with depletion of formation energy, the produced water is increased, when the liquid carrying capacity of the gas well cannot meet the requirement of the produced water of the discharged gas formation, liquid accumulation can be formed at the bottom of the well to cause the condition that the yield of the gas well is reduced and even the gas well is flooded, and at the moment, the liquid accumulation at the bottom of the well needs to be discharged in a physical or chemical mode. The foam drainage is widely applied to domestic and foreign fields due to the characteristics of convenient construction, simple equipment, low cost, high drainage efficiency and the like.
Foaming agents adopted by the existing foam drainage are mainly divided into liquid and solid, but the existing liquid foaming agents only take performance factors such as foam, temperature resistance, salt resistance or oil resistance into limited consideration, and the effect of sinking and delaying the liquid level of the liquid to be drained in the underground is not evaluated, and the situations are usually caused: under the condition that the stratum has certain energy or is normally recovered and transported, the conventional liquid foaming agent can meet the effect of foam drainage, but the liquid foaming agent only acts on the surface of underground effusion after being injected and cannot disperse and sink in the effusion, so that the effective foaming agent concentration at the middle part or the bottom part of the underground effusion is too low or even not high, and the gas well cannot play a role of foam drainage when suffering from complete flooding or insufficient stratum energy or extremely low stratum energy, thereby seriously affecting the drainage effect.
At present, most of solid foaming agents are spherical or rod-shaped, and can fall below the liquid level of accumulated liquid, but special delivery devices are needed in the using process of the solid foaming agents, the operation is complex, the operation is not beneficial to field operation and construction, and the solid foaming agents cannot reach the position of the accumulated liquid under the condition that fish falls in a horizontal well or a downhole, so that the foam discharging function cannot be exerted. Furthermore, as the gas well production cycle is extended, solid phase impurities in the formation such as: high-specific gravity solid-phase substances such as fracturing propping agent particles, rock particles, corrosion scrap iron of a downhole tubular column, heavy materials immersed into a stratum in a drilling process and the like can also gradually accumulate to a near-wellbore area or a shaft to form blockage along with the process of producing water from the stratum, so that the yield of a gas well is influenced, and therefore, the sand carrying capacity is equally important in the foam drainage process; although the foam has certain sand carrying capacity, the foam can only carry extremely fine solid-phase particles, and cannot suspend and carry solid-phase particles with larger particle size and higher specific gravity.
Disclosure of Invention
The invention aims to provide a sinking type liquid delay foaming agent for gas production foam drainage and sand carrying, and aims to solve the technical problem that in the prior art, the liquid foaming agent cannot disperse and sink in accumulated liquid, so that the concentration of the effective foaming agent in the middle or the bottom of the underground accumulated liquid is too low or even not high, and the drainage effect is seriously influenced. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a sinking type liquid delay foaming agent for gas production foam drainage and sand carrying, which is prepared from the following raw materials in percentage by weight: 60% -80% of nonionic surfactant; 4% -6% of fluorocarbon surfactant; 8% -10% of titanium dioxide; 0.1% -0.3% of xanthan gum; the balance of antifreeze solution.
Further, the weight percentages of the raw materials are respectively as follows: 65% -75% of nonionic surfactant; 4.5 to 5.5 percent of fluorocarbon surfactant; 8.5 to 9.5 percent of titanium dioxide; 0.1% -0.3% of xanthan gum; the balance of antifreeze solution.
Further, the weight percentages of the raw materials are respectively as follows: 70% of nonionic surfactant; 5% of fluorocarbon surfactant; 9% of titanium dioxide; 0.2% of xanthan gum; 15.8 percent of antifreeze.
Further, the nonionic surfactant comprises soapberry extract and coconut diethanolamide.
Further, the weight ratio of the soapberry extract to the coconut diethanolamide is 40-50: 20-30.
Furthermore, the weight ratio of the soapberry extract to the coconut diethanolamide is 42-48: 22-28.
Further, the weight ratio of the soapberry extract to the coconut diethanolamide is 45: 25.
Further, the fluorocarbon surfactant is a perfluorocarboxylic acid salt.
Further, the antifreeze is glycol.
The preparation method of the sinking type liquid delay foaming agent for gas production foam drainage and sand carrying comprises the following steps:
(1) preparing raw materials according to a ratio; adding fructus Sapindi Mukouossi extract into a negative pressure heating and stirring kettle, heating to 50-55 deg.C and maintaining at the same temperature, stirring at 30-40r/min under negative pressure of 0.1-0.15Mpa for 25-35 min;
(2) sequentially adding coconut oil diethanolamide and fluorocarbon surfactant into the kettle under stirring (at a stirring speed of 30-40r/min), and uniformly stirring for 0.8-1.2h at a stirring speed of 30-40 r/min;
(3) stirring (stirring speed is 30-40r/min), heating the liquid in the stirring kettle by circulating negative pressure of a circulating shear pump, sequentially adding titanium dioxide and xanthan gum from a feed inlet of the circulating shear pump, wherein the shearing rate of the circulating shear pump is 200--1The feeding speed of the titanium dioxide is 1.3-1.5kg/min, and the feeding speed of the xanthan gum is 30-50 g/min;
(4) after the titanium dioxide and the xanthan gum are added, stirring (the stirring speed is 30-40r/min) is kept, the liquid in the kettle is fully and circularly sheared to be in a uniform state, and the apparent viscosity of the liquid in the kettle body is measured; the apparent viscosity of the liquid in the kettle is 40-50mpa.S at 50 +/-1 ℃ to obtain homogeneous liquid;
(5) after the homogeneous liquid in the step (4) is obtained, closing the shear pump; adding ethylene glycol into the stirring kettle under stirring (stirring speed of 30-40r/min), stirring for 25-35min, cooling, and relieving pressure to obtain the final product.
The soapberry extract applied in the invention is a natural nonionic surfactant, can reduce the surface tension of water, has rich foam, is environment-friendly and pollution-free, and can play a good foaming effect when being applied to a foaming agent.
The coconut diethanolamide used in the present invention belongs to a nonionic surfactant and has no cloud point. The liquid is a yellowish to amber viscous liquid, is easy to dissolve in water, and has good functions of foaming, foam stabilization, penetration decontamination, hard water resistance and the like. Belongs to a nonionic surfactant, has particularly obvious thickening effect when being compatible with an anionic surfactant when the anionic surfactant is acidic, and can be compatible with various surfactants. Can enhance cleaning effect, and can be used as additive, foam stabilizer, and foam auxiliary agent. An opaque fog-like solution is formed in water, can be completely transparent under certain stirring, can be completely dissolved in different types of surfactants under certain concentration, can be completely dissolved in low carbon and high carbon, and can play excellent foaming and foam stabilizing effects when applied to a foaming agent.
The fluorocarbon surfactant applied in the invention can obviously reduce the surface tension of the aqueous solution at extremely low application concentration. The thermal stability is high, the perfluorocarboxylic acid can stably exist at the temperature of 400 ℃, and the perfluorocarboxylic acid salt can also be applied to a high-temperature system at the temperature of 250 ℃ to meet the high-temperature requirement of a well bottom; the chemical stability is good, the fluorocarbon surface activity can stably and effectively play the role of a surfactant in special application systems such as strong acid, strong alkali, strong oxidation medium and the like, and the fluorocarbon surface activity cannot react with or decompose the system; the compatibility is good, high chemical stability means high chemical inertia, the fluorocarbon surfactant can be well compatible with other various active agents and can be applied to almost all formula systems, and the fluorocarbon surfactant has good compounding synergistic effect with soapberry extract and coconut oil diethanolamide, so that the foaming, microbubble and liquid carrying capacities of the fluorocarbon surfactant are greatly improved.
The xanthan gum applied in the invention is a biopolymer, has unique rheological property, good water solubility, stability to heat and acid and alkali, and good compatibility with various salts, can be widely applied to more than 20 industries such as food, petroleum, medicine and the like as a thickening agent, a suspending agent, an emulsifying agent and a stabilizing agent, and is the microbial polysaccharide which has the largest production scale and extremely wide application in the world at present. The foaming agent can be in a spatial network structure after being dispersed and expanded in water, the framework structure is reinforced under the condition of combining a titanium dioxide solid phase, and the liquid carrying capacity and the carrying capacity of a high-specific-gravity solid phase object of foaming agent foam can be greatly improved; meanwhile, the colloid characteristic of the polymer can play a good colloid protection role in each component of the foaming agent, and the dispersion effect of the foaming agent when the foaming agent contacts the surface of the bottom hole accumulated liquid is delayed, so that the foaming agent is gradually dispersed in the process of carrying and falling the titanium dioxide carrier, the effective equivalent concentration of each part of the bottom hole accumulated liquid of the foaming agent is improved, and a good foam discharging effect is achieved.
The titanium dioxide used in the invention is an inorganic substance, is a white solid or powdery amphoteric oxide, and has the characteristics of no toxicity, strong adsorbability, difficult chemical change, high density and the like. Can be dissolved in sulfuric acid, hydrochloric acid and nitric acid, and can not cause damage to a reservoir stratum after entering a gas well due to the characteristic of acid solubility. Meanwhile, titanium dioxide particles can absorb opposite charges in a liquid medium due to surface charges to form a diffusion double electric layer, so that the effective diameter of the particles is increased whenWhen the particles are close to each other, the particles repel each other due to the same charges, which is beneficial to the stability of a dispersion system; meanwhile, the fine particles are dispersed in a colloid system to strengthen a spatial network structure, which is beneficial to cleaning the inner wall of the production oil pipe and improving the gas production period and efficiency. The functions of the invention are mainly as follows: 1. as an adsorption carrier, the stability of the compounding of each component of the foaming agent and the foam synergistic effect of the components are improved; 2. due to its own high specific gravity (4.0-4.2 g/cm)3) The method has the characteristics of providing a sinking effect for the foaming agent in the application process, and enabling the foaming agent to fully act on each part of accumulated liquid at the bottom of a well, thereby improving the effective equivalent concentration of the foaming agent in the accumulated liquid to be discharged underground.
The glycol applied in the invention is the most common antifreeze applied to oil and gas wells on site at present, can effectively avoid the generation of hydrates of oil pipes and ground pipelines, and can be mixed with water in any proportion. The low-temperature flow-ability-improved foaming agent is mainly applied to the foaming agent, and the good pumping and application capabilities of the foaming agent in a low-temperature environment are met.
The invention takes the soapberry extract as the base solution, and the main functions of the soapberry extract are to reduce the surface tension and provide foam; after the coconut diethanolamide and the fluorocarbon surfactant are added on the basis, the foaming capacity is further increased, and the foam stabilizing and liquid carrying performance can be enhanced.
Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
(1) the gas production foam drainage and sand carrying sinking type liquid delay foaming agent provided by the invention is a flowable liquid, can be pumped by a conventional auxiliary agent pump without an additional delivery device or a wellhead disassembly, and is simple and rapid in site construction and low in construction cost;
(2) the sinking liquid delayed foaming agent for gas production foam drainage and sand carrying provided by the invention has excellent foaming, foam stabilizing, liquid carrying and dispersion and dissolution delaying capabilities; the foaming agent can freely sink in saline water, namely the foaming agent cannot be immediately dissolved and dispersed or float on the liquid surface of the shaft effusion after meeting water, does not contain large solid particles which are easy to block downhole tools, can delay foaming, and greatly improves the effective equivalent concentration of the foaming agent in the shaft effusion; achieving excellent foam discharging effect.
(3) The sinking liquid delay foaming agent for gas production foam drainage and sand carrying, provided by the invention, has excellent foam drainage effect on special gas wells such as a water flooded well and a fish falling well due to the characteristics of sinking, flowability and delay, so that the sinking liquid delay foaming agent can be simultaneously applied to foam drainage of special gas wells such as a conventional production well and the water flooded well and the fish falling well;
(4) according to the sinking type liquid delayed foaming agent for gas production foam drainage and sand carrying, as xanthan gum is a multi-chain polymer, after being completely dissolved in water, side chains of xanthan gum can be dispersed and spread around a main chain to form a net structure, and after being dissolved in accumulated liquid, the xanthan gum forms a space net structure, so that the suspension and carrying effects on high-specific-gravity solid-phase substances can be achieved, and the space net structure is enhanced by dispersing fine particles of titanium dioxide in a colloid system, so that the carrying capacity of the xanthan gum on high-specific-gravity solid-phase plugs at the bottom of a well is greatly improved; for downhole, such as: large-particle and high-specific-gravity solid matters such as fracturing propping agent particles, rock particles, corrosion scrap iron of a downhole pipe column, heavy materials and the like which are immersed into a stratum in a drilling process have good carrying effects, and help a shaft to be unplugged;
(5) the sinking liquid delay foaming agent for gas production foam drainage and sand carrying, provided by the invention, has a high flash point, the open flash point is more than 100 ℃, the safe use in a natural gas well production field can be met, and the production and transportation safety can be ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a graph showing the effect of the sink-retarding effect of example 1 of the present invention and a comparative example.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present invention.
First, preparation examples
1.1, raw materials
The weight percentages of the raw materials for preparing the gas production foam drainage and sand carrying sinking type liquid delay foaming agent in the examples 1-5 are shown in the following table 1:
table 1 examples 1-5 raw material table
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Soapnut |
40％ | 50％ | 42％ | 48％ | 45％ |
| Coconut |
30％ | 20％ | 28％ | 22％ | 25％ |
| Perfluoroalkyl ether carboxylic acid potassium salt | 6％ | 4％ | 4.5％ | 5.5％ | 5％ |
| |
10％ | 8％ | 9.5％ | 8.5％ | 9％ |
| Xanthan gum | 0.3％ | 0.1％ | 0.2％ | 0.3％ | 0.2％ |
| Ethylene glycol | 13.7％ | 17.9％ | 15.8％ | 15.7％ | 15.8％ |
1.2, the preparation method comprises the following steps:
example 1:
the method comprises the following steps:
(1) preparing raw materials according to the mixture ratio of the raw materials in the table 1; adding fructus Sapindi Mukouossi extract into a negative pressure heating and stirring kettle, heating to 52 deg.C and maintaining at the same temperature, stirring at 35r/min and negative 0.2Mpa for 30 min;
(2) sequentially adding coconut oil diethanolamide and fluorocarbon surfactant into the kettle under stirring (at a stirring speed of 35r/min), and uniformly stirring for 1h at a stirring speed of 35 r/min;
(3) keeping stirring (stirring speed is 35r/min), heating the liquid in the stirring kettle by circulating negative pressure of a circulating shear pump, and sequentially adding titanium dioxide and xanthan gum from a feed inlet of the circulating shear pump, wherein the shearing rate of the circulating shear pump is 220s-1The titanium dioxide feeding rate is 1.4kg/min, and the xanthan gum feeding rate is 40 g/min;
(4) after the titanium dioxide and the xanthan gum are added, stirring (the stirring speed is 35r/min) is kept, the liquid in the kettle is fully and circularly sheared to be in a uniform state, and the apparent viscosity of the liquid in the kettle body is measured; the apparent viscosity of the liquid in the kettle body is 45mpa.S at the temperature of 50 +/-1 ℃ to obtain homogeneous liquid;
(5) after the homogeneous liquid obtained in the step (4) is obtained, closing the shear pump; and adding ethylene glycol into the stirring kettle under the stirring state (the stirring speed is 35r/min), fully stirring for 30min, cooling, and relieving pressure to obtain a finished product.
Example 2:
the method comprises the following steps:
(1) preparing raw materials according to the mixture ratio of the raw materials in the table 1; adding fructus Sapindi Mukouossi extract into a negative pressure heating and stirring kettle, heating to 55 deg.C and maintaining at the same temperature, stirring at 40r/min under negative pressure of negative 0.1Mpa for 25 min;
(2) sequentially adding coconut oil diethanolamide and fluorocarbon surfactant into the kettle under stirring (at a stirring speed of 40r/min), and uniformly stirring for 0.8h at a stirring speed of 40 r/min;
(3) stirring (stirring speed is 40r/min) is kept, the liquid in the stirring kettle is heated by the circulating negative pressure of a circulating shear pump, titanium dioxide and xanthan gum are sequentially added from a feed inlet of the circulating shear pump, and the shearing rate of the circulating shear pump is 240s-1The titanium dioxide feeding rate is 1.5kg/min, and the xanthan gum feeding rate is 50 g/min;
(4) after the titanium dioxide and the xanthan gum are added, stirring (the stirring speed is 40r/min) is kept, the liquid in the kettle is fully and circularly sheared to be in a uniform state, and the apparent viscosity of the liquid in the kettle body is measured; the apparent viscosity of the liquid in the kettle body is 50mpa.S at the temperature of 50 +/-1 ℃ to obtain homogeneous liquid;
(5) after the homogeneous liquid in the step (4) is obtained, closing the shear pump; and (3) adding ethylene glycol into the stirring kettle under the stirring state (the stirring speed is 40r/min), fully stirring for 25min, cooling, and relieving pressure to obtain a finished product.
Example 3:
the method comprises the following steps:
(1) preparing raw materials according to the mixture ratio of the raw materials in the table 1; adding fructus Sapindi Mukouossi extract into a negative pressure heating and stirring kettle, heating to 50 deg.C and maintaining at the same temperature, stirring at 30r/min under a pressure of minus 0.15MPa, and stirring for 35 min;
(2) sequentially adding coconut oil diethanolamide and fluorocarbon surfactant into the kettle under stirring (the stirring speed is 30r/min), and stirring at a constant speed of 30r/min for 1.2 h;
(3) stirring (stirring speed of 30r/min) is kept, the liquid in the stirring kettle is heated by the circulating negative pressure of a circulating shear pump, titanium dioxide and xanthan gum are sequentially added from a feed inlet of the circulating shear pump, and the shearing rate of the circulating shear pump is 200s-1The titanium dioxide feeding rate is 1.3kg/min, and the xanthan gum feeding rate is 30 g/min;
(4) after the titanium dioxide and the xanthan gum are added, stirring (the stirring speed is 30r/min) is kept, the liquid in the kettle is fully and circularly sheared to be in a uniform state, and the apparent viscosity of the liquid in the kettle body is measured; the apparent viscosity of the liquid in the kettle body is 40mpa.S at the temperature of 50 +/-1 ℃ to obtain homogeneous liquid;
(5) after the homogeneous liquid in the step (4) is obtained, closing the shear pump; and adding ethylene glycol into the stirring kettle under the stirring state (the stirring speed is 30r/min), fully stirring for 35min, cooling, and relieving pressure to obtain a finished product.
Example 4, example 5:
the preparation method is the same as example 1.
Second, performance detection
1. The properties of the gas production foam drainage and sand carrying sinking liquid delayed foaming agents prepared in examples 1 to 5 are tested; the model is produced by Chengdu Huayang Xinghua chemical industry limited company: the blowing agent of XH-5 was a blowing agent of the type produced in comparative example 1 by Gensfungi science and technology, Inc.: the blowing agent of UT-5D was used in comparative example 2, and the blowing agent of UT-7, model number of Doufgi scientific Co., Ltd., was used in comparative example 3.
1.1 detection standard and detection method:
(1) flash points (openings) test specimens were defined in GB/T3536-2008 for flash point.
(2) Measurement of foaming Capacity
Preparing saline water:
weighing 15.0g of CaCl2And 70.0g of NaCl is put into a 500mL beaker, is completely dissolved by distilled water, is transferred into a 1000mL volumetric flask, is washed by distilled water for three times, is transferred into the volumetric flask, and is added with distilled water to reach the constant volume of 1000mL, so that saline water is obtained for later use.
Measuring foaming power, foam stabilizing power and liquid carrying amount:
weighing 1000mL of prepared saline water in a 5000mL graduated cup, keeping the saline water stirred by using a low-speed stirrer under the condition of 700r/min, extracting 2.0mL of foaming agent sample to be detected by using a 5mL injector, slowly adding the sample into the saline water at a constant speed, and stirring for 15min to prepare a test solution.
Connecting a Rogowski foam instrument pipeline, opening a constant-temperature water bath, starting a water pump to enable circulating water to pass through a graduated tube jacket, keeping the water temperature constant at 60.0 +/-0.5 ℃, and fully rinsing the graduated tube by using a test solution; and (3) pouring 50.0mL of test solution into a graduated tube, ensuring that the liquid level is just at the 50mL graduation, filling 200mL of test solution into the graduated tube by a suction washing method, measuring according to a test method of 5.3 in GB/T13173.6-91, starting timing, and recording the highest height of initial foam as foaming power and the highest height of foam at the time of 3min as foam stabilizing power.
After the foaming power and the foam stabilizing power are tested, a water outlet at the lower end of a graduated tube of the Rogowski Meter foam instrument is connected with an air flow pump, air is introduced for 20min at the air flow of 5L/min, and the volume V of the residual liquid after foam discharge is measured1The liquid carrying amount V is calculated according to the formula (1).
V＝250-V1… … … … … … … … … … … … … … formula (1)
In the formula:
v-liquid carrying amount, mL;
V1residual liquid volume, mL.
(3) Half life period
Measuring 150.0mL of saline prepared in (2) I, transferring the saline into a high-speed stirring cup, adding 0.3mL of foaming agent sample, stirring at a high speed for 2min under the condition of 11000 +/-300 r/min, rapidly transferring into a 1000mL measuring cylinder, simultaneously opening a stopwatch, and recording the time for precipitating 75.0mL of liquid as a half-life period.
(4) Test for retarding ability
(ii) static Rate of deferral
Taking 100.0mL of saline prepared in (2) r, standing in a 100mL measuring cylinder, dyeing a sample to be detected with trace methylene blue (facilitating the observation of a delay rate test), using a 30mL syringe to extract 20.0mL of the dyed sample, injecting the sample into the 100mL saline measuring cylinder within 10S, standing for 5min, reading the volume of the sample settled to the bottom of the measuring cylinder, marking as V2, and calculating the static delay rate D according to the formula (2).
In the formula:
d-static retardation rate,%;
V2the settled volume of the sample at the bottom of the cylinder, mL.
② dynamic delay time
Connecting with a Rogowski foam instrument pipeline, opening a thermostatic water bath and starting a water pump to enable circulating water to pass through a graduated tube jacket, so that the water temperature is kept constant at 60.0 +/-0.5 ℃. 300mL of the saline prepared in the step (2) is measured into a 500mL beaker, 0.6mL of foaming agent sample is added under the condition of 700r/min, the mixture is stirred at a low speed for 15min, 250mL of the saline is poured into a calibrated tube of a Rogomir foam meter, and the liquid level is just at the 250mL scale. Connecting a water outlet at the lower end of a graduated tube of the Rogowski foam meter with an air flow pump, introducing air at an air flow rate of 5L/min, when foam begins to overflow from the graduated tube of the Rogowski foam meter, extracting 2.0mL of a foaming agent sample dyed by trace methylene blue by using a 5mL syringe, pushing the foaming agent sample into the graduated tube, immediately starting timing by using a stopwatch after the sample is added, and recording the time when the foaming agent sample reaches the saline water level in the graduated tube as dynamic delay time.
1.2, detection result:
as shown in fig. 1, a graph of the effect of the sink retardation when the sample is settled to the bottom volume of the measuring cylinder after standing for 5min at the static retardation rates detected in example 1 and comparative examples 1 to 3 is shown in the following table 2:
table 2 results of performance testing
As can be seen from Table 2, the gas production foam drainage and sand carrying submerged liquid delayed foaming agents prepared in examples 1-5 of the present invention have the following advantages compared to the foaming agents in comparative examples 1-3:
(1) the flash point performance is improved, and the safety performance in the processes of field use, production and transportation is further improved;
(2) the foaming capacity, foam stabilizing capacity and liquid carrying capacity are more excellent;
(3) the static and dynamic delaying functions of the foaming agent are realized, the foaming agent can freely sink in high-density brine, and the problem that the effective equivalent concentration of the foaming agent at the lower part of the brine cannot be improved because the conventional foaming agent is dispersed or only floats on the surface of the brine when meeting water is solved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (5)
1. A sinking liquid delay foaming agent for gas production foam drainage and sand carrying is characterized in that: the preparation method comprises the following raw materials in percentage by weight: 60% -80% of nonionic surfactant; 4% -6% of fluorocarbon surfactant; 8% -10% of titanium dioxide; 0.1% -0.3% of xanthan gum; the balance of antifreeze solution;
the nonionic surfactant comprises soapberry extract and coconut diethanolamide; the weight ratio of the soapberry extract to the coconut oil diethanolamide is 40-50: 20-30;
the fluorocarbon surfactant is perfluorocarboxylate;
the antifreeze is glycol.
2. The gas production foam drainage and sand carrying sinking liquid state delayed foaming agent according to claim 1, characterized in that: the weight percentages of the raw materials are respectively as follows: 65% -75% of nonionic surfactant; 4.5 to 5.5 percent of fluorocarbon surfactant; 8.5 to 9.5 percent of titanium dioxide; 0.1% -0.3% of xanthan gum; the balance of antifreeze solution.
3. The gas production foam drainage and sand-carrying sinking liquid delayed foaming agent according to claim 2, which is characterized in that: the weight percentages of the raw materials are respectively as follows: 70% of nonionic surfactant; 5% of fluorocarbon surfactant; 9% of titanium dioxide; 0.2% of xanthan gum; 15.8 percent of antifreeze.
4. The gas production foam drainage and sand carrying sinking liquid state delayed foaming agent according to claim 1, characterized in that: the weight ratio of the soapberry extract to the coconut diethanolamide is 42-48: 22-28.
5. The gas production foam drainage and sand-carrying sinking liquid delay foaming agent according to claim 1, which is characterized in that: the weight ratio of the soapberry extract to the coconut oil diethanolamide is 45: 25.
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| CN113484192B (en) * | 2021-09-06 | 2021-12-14 | 广汉市福客科技有限公司 | Evaluation device and evaluation method of sinking type delayed foaming agent |
| CN115873581B (en) * | 2021-09-29 | 2024-05-28 | 中国石油化工股份有限公司 | Responsive foaming agent, foam discharging agent and preparation method and application thereof |
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