Foam sand consolidation agent as well as preparation method and application thereof

Abstract

The invention provides a foam sand consolidation agent as well as a preparation method and application thereof. The foam sand consolidation agent comprises the following components in parts by weight: 100 parts of epoxy resin, 25-35 parts of a curing agent, 5-6 parts of an emulsifier, 1-3 parts of a foaming agent and 0.75-4 parts of a foam stabilizer. According to the foam sand consolidation agent, the salt resistance and efficient foaming performance of the foam sand consolidation agent are achieved through the design of the preparation materials and the formula, and under the simulated salt cavern gas storage field application working conditions (the concentration of saturated brine is 25%, the density is 1.22 g / cm < 3 >, and the temperature is 50 DEG C), the foam sand consolidation agent is good in foaming effect, good in solid-phase particle cementing performance and high in foaming efficiency. The sand control barrier formed by adhering and solidifying sediment particles and the like adsorbed around the bittern discharging pipe column is good in permeability and sand control effect, and when 1000mL of bittern is discharged accumulatively, the accumulative sand production amount is 0.45 g, and the sand production rate is only about 0.4%.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and natural gas storage, and specifically relates to a foam sand consolidating agent and a preparation method and application thereof. Background Art

[0002] Underground salt cavern storage has unique advantages such as large storage capacity, high storage pressure, high utilization rate and good economy. In recent years, it has been widely used in energy storage such as natural gas, oil, compressed air, hydrogen and helium, and the scale of application has increased year by year. Foreign salt cavern gas storage is generally built in huge salt domes, with high salt rock content, few interlayers and low insoluble content. Therefore, the insoluble accumulation body after the dissolution cavity of foreign salt cavern gas storage is small, and the storage capacity loss is small; however, the geological resources for the construction of domestic salt cavern gas storage are mostly layered salt layers (lake phase deposits), and the salt-bearing strata have interlayers of varying proportions, with an interlayer ratio of 10%-50%. The lithology is mainly mudstone, and some contain anhydrite and glauberite; the insoluble content in the salt layer and interlayer is high, with the insoluble content of the salt layer up to 40% and the interlayer up to more than 90%; after the dissolution cavity ends, there will be a thick accumulation of insolubles at the bottom of the cavity, and the accumulation of insolubles and internal brine occupy a large amount of storage capacity. According to statistics, in areas such as Jintan, Chuzhou, Huai'an, and Pingdingshan that are under construction or planned, after the water-soluble method is used to build the caverns of gas storage wells in salt caverns, the volume of insoluble sediment in the caverns usually accounts for 1 / 3 to 2 / 3 of the total volume of the caverns, resulting in nearly half of the salt caverns not being effectively utilized. For this reason, companies such as CNPC, the National Pipeline Network, and Jintan Salt Industry have carried out technical exploration, research, and experiments on the utilization of the void space of salt cavern sediments and the expansion of the cavern gas storage space.

[0003] The sediment at the bottom of the salt cavern is mainly composed of salt rock and interlayer water-insoluble matter that breaks, expands, settles and accumulates during the water-soluble cavern formation process. The sediment blocks vary in size and shape, with an internal porosity of up to 40%-50%. It is filled with saturated brine and fine sediment particles. The density of the brine is 1.22-1.3g / cm 3, concentration of about 27%, usually 40℃-60℃. When conducting exploratory tests on the expansion of brine drainage by gas injection in the void space of the bottom sediment of the salt cavern, how to effectively prevent the sediment particles at the bottom of the cavern from entering and clogging the brine drainage pipe column is one of the key problems that need to be solved urgently. It is considered a feasible process to lower the brine drainage pipe column into the sediment at the bottom of the salt cavern cavity, and use foam sand consolidation agents to cement and consolidate the sand around the brine drainage pipe column to form a quasi-artificial well wall with high permeability and sand control functions. Existing foam sand consolidation agents are mostly used in oil and water wells. They control the sand production of the reservoir by forming a solidified layer on the surface of the loose sand around the bottom production pipe column or in the fractures of the reservoir near the wellbore and cementing them together. They have a good application effect of sand consolidation and sand control. However, the sediment at the bottom of the salt cavern gas storage is mainly formed by the water-insoluble matter in the salt layer and interlayer breaking and expanding and settling. It is loosely piled, has low compaction degree and low mechanical strength, and has a porosity of about 45%. It is filled with brine and small residual particles. During the secondary brine discharge and expansion process of the sediment void space, the residual particles are easy to block the brine discharge column with the flow of brine. There is no relevant research and report on the utilization of the void space of salt cavern sediment, the anti-blocking process measures of the brine discharge and expansion column in the sediment, and the research and development of agents. At present, there is no relevant research and report abroad, and China is still in the stage of theoretical research and technical breakthrough. Therefore, it is urgent to develop a low-cost, high-performance salt-resistant foam sand consolidating agent that can be used for brine discharge and expansion of the bottom sediment of the salt cavern gas storage according to the physical characteristics of salt cavern sediment and the application environment of high-saturated brine. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a foam sand consolidating agent and a preparation method and application thereof. Through the screening and compounding of the various components of the foam sand consolidating agent, the foam sand consolidating agent has both good sand consolidation and sand prevention effects and high permeability, and can be used for the brine discharge and capacity expansion of the void space of the sediment in the salt cavern gas storage reservoir, thereby providing a guarantee for the brine discharge and capacity expansion of the void space of the sediment in the salt cavern gas storage reservoir.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a foam sand consolidating agent, which comprises the following components in parts by weight: 100 parts by weight of epoxy resin, 25-35 parts by weight of curing agent, 5-6 parts by weight of emulsifier, 1-3 parts by weight of foaming agent and 0.75-4 parts by weight of foam stabilizer.

[0007] The foam sand consolidating agent provided by the present invention can be used for salt cavern gas storage cavity bottom sediment discharge and brine expansion. According to the characteristics of high porosity of salt cavern gas storage cavity bottom sediment and strong fluidity of residue particles with brine, and combined with the requirements of medium and high temperature and saturated brine environment in field application, the salt resistance and foaming performance of the foam sand consolidating agent formula are optimized. Through the synergistic effect of various components, the foaming and cementing properties are good, and the permeability is also good, which can fully meet the application needs of salt cavern gas storage cavity bottom sediment discharge and brine expansion.

[0008] The curing agent is 25-35 parts by weight, for example, it can be 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight or 35 parts by weight, as well as specific points between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0009] The emulsifier is 5-6 parts by weight, for example, it can be 5 parts by weight, 5.1 parts by weight, 5.2 parts by weight, 5.3 parts by weight, 5.4 parts by weight, 5.5 parts by weight, 5.6 parts by weight, 5.7 parts by weight, 5.8 parts by weight, 5.9 parts by weight or 6 parts by weight, as well as specific points between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively enumerates the specific points included in the range.

[0010] The foaming agent is 1-3 parts by weight, for example, it can be 1 part by weight, 1.2 parts by weight, 1.5 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.5 parts by weight, 2.8 parts by weight or 3 parts by weight, as well as specific points between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0011] The foam stabilizer is 0.75-4 parts by weight, for example, it can be 0.75 parts by weight, 1 part by weight, 1.2 parts by weight, 1.5 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.5 parts by weight, 2.8 parts by weight, 3 parts by weight, 3.5 parts by weight, 3.8 parts by weight or 4 parts by weight, as well as specific points between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0012] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved and realized.

[0013] As a preferred technical solution, the epoxy resin includes epoxy resin E51.

[0014] Preferably, the curing agent includes anhydrides and / or amines.

[0015] Preferably, the acid anhydrides include 4-methyl-1,2-cyclohexanedicarboxylic anhydride.

[0016] Preferably, the amines include any one of 650 epoxy resin curing agent, 651 epoxy resin curing agent or H-113 modified aromatic amine epoxy curing agent, or a combination of at least two thereof.

[0017] As a preferred technical solution, the emulsifier includes dodecylphenol polyoxyethylene ether.

[0018] Preferably, the foaming agent includes any one of polysorbate 80, sodium lauryl sulfate, lauryl amide propyl hydroxysulfonate betaine or dodecyl dimethylamino betaine, or a combination of at least two thereof, and dodecyl dimethylamino betaine is further preferred.

[0019] As a preferred technical solution, the foam stabilizer includes a combination of a polymer foam stabilizer and a particle foam stabilizer.

[0020] Preferably, the polymer foam stabilizer includes any one of PEG-2000, PEG-6000, PEG-10000, PVA1788 or hydroxyethyl cellulose.

[0021] Preferably, in parts by weight, the polymer foam stabilizer is 0.5-3 parts by weight, for example, it can be 0.5 parts by weight, 0.8 parts by weight, 1 part by weight, 1.5 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.5 parts by weight, 2.8 parts by weight or 3 parts by weight, as well as specific points between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0022] Preferably, the granular foam stabilizer comprises nano silicon dioxide.

[0023] Preferably, the foamed sand consolidating agent also includes an accelerator.

[0024] Preferably, based on 100 parts by weight of the epoxy resin, the mass of the accelerator is ≤13 parts by weight, for example, it can be 0 parts by weight, 1 part by weight, 3 parts by weight, 5 parts by weight, 7 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight or 13 parts by weight, as well as specific points between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0025] Preferably, the accelerator includes any one of 2,4,6-tris(dimethylaminomethyl)phenol, methyldibenzylamine or an organic phosphorus / bromine complex, or a combination of at least two thereof.

[0026] Preferably, the foamed sand consolidating agent further comprises a solvent.

[0027] Preferably, the mass ratio of the epoxy resin to the solvent is 1:(0.4-0.8), for example, it can be 1:0.4, 1:0.45, 1:0.5, 1:0.55, 1:0.6, 1:0.65, 1:0.7, 1:0.75 or 1:0.8, etc.

[0028] Preferably, the solvent comprises water.

[0029] In a second aspect, the present invention provides a method for preparing the foam sand consolidating agent as described in the first aspect, the preparation method comprising the following steps:

[0030] (1) mixing an epoxy resin and an emulsifier and emulsifying them to obtain an emulsion, and adding a solvent to the emulsion to obtain a base liquid;

[0031] (2) The base liquid obtained in step (1), a curing agent, an optional accelerator, a foaming agent and a foam stabilizer are mixed to obtain the foam sand consolidating agent.

[0032] Preferably, the emulsification temperature is 70-80°C, for example, it can be 70°C, 71°C, 72°C, 73°C, 74°C, 75°C, 76°C, 77°C, 78°C, 79°C or 80°C, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0033] Preferably, the emulsification time is 5-30 min; for example, it can be 5 min, 7 min, 10 min, 13 min, 15 min, 18 min, 20 min, 23 min, 25 min, 28 min or 30 min, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0034] Preferably, the emulsification is carried out under stirring.

[0035] Preferably, the stirring speed is 5000-8000 r / min, for example, it can be 5000 r / min, 5200 r / min, 5500 r / min, 5800 r / min, 6000 r / min, 6200 r / min, 6500 r / min, 6800 r / min, 7000 r / min, 7200 r / min, 7500 r / min, 7800 r / min or 8000 r / min, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0036] Preferably, the viscosity of the base liquid is 0.05-2 Pa.s; for example, it may be 0.05 Pa.s, 0.08 Pa.s, 0.1 Pa.s, 0.12 Pa.s, 0.15 Pa.s, 0.18 Pa.s or 0.2 Pa.s, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0037] In a third aspect, the present invention provides an application of a foamed epoxy resin composition in a foamed sand consolidating agent, wherein the foamed epoxy resin composition comprises the following components in parts by weight: 100 parts by weight of epoxy resin, 25-35 parts by weight of curing agent, 5-6 parts by weight of emulsifier, 1-3 parts by weight of foaming agent and 0.75-4 parts by weight of foam stabilizer.

[0038] The present invention also provides an application of the foamed sand consolidating agent as described in the first aspect, wherein the foamed sand consolidating agent is used in the expansion of brine from bottom sediment in a salt cavern gas storage cavity.

[0039] Preferably, the curing temperature of the foam sand consolidating agent is 25-50°C, for example, it can be 25°C, 28°C, 30°C, 32°C, 35°C, 38°C, 40°C, 42°C, 45°C, 48°C or 50°C, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0040] Preferably, the curing time of the foam sand consolidating agent is 2-5 days, for example, it can be 2 days, 2.2 days, 2.5 days, 2.8 days, 3 days, 3.2 days, 3.5 days, 3.8 days, 4 days, 4.2 days, 4.5 days, 4.8 days or 5 days, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0041] The present invention also provides a supporting process method for the on-site application of the foamed sand-fixing agent as described in the first aspect in the brine drainage expansion of the bottom sediment of the salt cavern gas storage: according to the raw material formula and preparation method of the foamed sand-fixing agent, the required foamed sand-fixing agent is prepared on-site, and the prepared foamed sand-fixing agent is injected into the bottom sediment of the salt cavern cavity through the brine drainage pipe column by using cement pump truck / mud pump and other equipment, and squeezed into the sediment around the pipe column through the drainage holes pre-set in the sediment section of the brine drainage pipe column, and waited for 2 days or more to fully bond and solidify the foamed sand-fixing agent with the sediment particles around the pipe column. Before the foamed sand-fixing agent is applied on-site in the brine drainage expansion of the bottom sediment of the salt cavern gas storage, the ground equipment, pipelines and instruments must be carefully checked to ensure that the operation of the foamed sand-fixing agent can be continuous and stable when it is injected into the sediment through the brine drainage pipe column, so as to avoid the foamed sand-fixing agent being not injected into place due to equipment / pipeline failure, and consolidation blocking the brine drainage pipe column or ground equipment and pipelines.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The foam sand consolidating agent provided by the present invention fully considers the on-site application environment of the salt cavern gas storage and the physical properties of the cavity bottom sediment, and realizes the salt resistance and high-efficiency foaming performance of the foam sand consolidating agent by optimizing the preparation materials and formula. Under the conditions of simulating the on-site application of the salt cavern gas storage (saturated brine concentration of 25%, density of 1.22g / cm3 , temperature 50°C), using the foam sand consolidating agent provided by the present invention, the foaming effect is good, the solid phase particle bonding performance is good, the solidification time can be shortened to 2 days, and the sediment particles are adsorbed and solidified around the brine discharge column to form a sand control barrier with good permeability and good sand control effect. Under the simulated working conditions, when 1000mL of brine is discharged cumulatively, the cumulative sand output is 0.45g, and the sand output rate is only about 0.4%. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a bar graph of the foaming performance of the foam sand consolidating agent provided in Examples 1-5 and Comparative Example 1;

[0045] Figure 2 It is a bar graph of the foaming performance of the foam sand consolidating agent provided in Example 1 and Examples 6-10;

[0046] Figure 3 is a microscopic image of combined quartz sand cemented and solidified using the foamed sand consolidating agent provided in Example 1;

[0047] Figure 4 is another microscopic image of combined quartz sand cemented and solidified using the foamed sand consolidating agent provided in Example 1;

[0048] Figure 5 It is an indoor simulated sediment injection foam curing agent bonding experimental device;

[0049] Figure 6 The foamed sand consolidating agent provided in Example 1 simulates the cementing and consolidating sand effect around the brine drainage pipe column indoors. DETAILED DESCRIPTION

[0050] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and through specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0051] The sources of some components in the following examples and comparative examples are as follows:

[0052] (1) Epoxy resin E51: Jinan Rongxin Fine Chemical Co., Ltd., industrial grade, molecular weight 392;

[0053] (2) Dodecylphenol polyoxyethylene ether: Shandong Jintai Hongfa Biotechnology Co., Ltd., molecular weight 646;

[0054] (3) Nano-silicon dioxide: Nanjing Baoket New Materials Co., Ltd., particle size 20 nm;

[0055] (4) 4-Methyl-1,2-cyclohexanedicarboxylic anhydride: Hubei Yunmei Technology Co., Ltd.;

[0056] (5) PVA1788: Guangzhou Qihua Chemical Co., Ltd.

[0057] Example 1

[0058] A foam sand consolidating agent comprises 100 parts by weight of epoxy resin E51, 33 parts by weight of 4-methyl-1,2-cyclohexanedicarboxylic anhydride, 10 parts by weight of 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30), 6 parts by weight of dodecylphenol polyoxyethylene ether, 2 parts by weight of dodecyldimethylamine ethyl lactone, 2 parts by weight of PVA1788, 0.5 parts by weight of nano silicon dioxide and 80 parts by weight of distilled water.

[0059] A method for preparing a foam sand consolidating agent, the preparation method comprising the following steps:

[0060] (1) epoxy resin E51 and dodecylphenol polyoxyethylene ether were mixed and emulsified at 8000 r / min, the emulsification temperature was 70° C., the emulsification time was 5 min, and an emulsion was obtained. Distilled water was added to the emulsion to obtain a base liquid, and the viscosity of the base liquid was 0.5 Pa.s;

[0061] (2) The base liquid obtained in step (1), 4-methyl-1,2-cyclohexanedicarboxylic anhydride, DMP-30, dodecyldimethylamine ethyl lactone, PVA1788 and nano-silicon dioxide are mixed to obtain the foam sand consolidating agent.

[0062] Embodiment 2-5

[0063] A foam sand consolidating agent, which differs from Example 1 only in that the added amounts of dodecyldimethylamine betaine are 1 part by weight, 1.5 parts by weight, 2.5 parts by weight and 3 parts by weight respectively, and the other components and added amounts are the same as those in Example 1.

[0064] A method for preparing a foam sand consolidating agent, which differs from Example 1 only in that the amount of dodecyldimethylamine betaine in step (2) is the amount provided in Examples 2-5, and the remaining process parameters and steps are the same as those in Example 1.

[0065] Examples 6-10

[0066] A foam sand consolidating agent, which differs from Example 1 only in that the added amounts of distilled water are 40 parts by weight, 60 parts by weight, 100 parts by weight, 120 parts by weight and 140 parts by weight respectively, and the remaining components and added amounts are the same as those in Example 1.

[0067] A method for preparing a foam sand consolidating agent, which differs from Example 1 only in that the amount of distilled water added in step (1) is the amount provided in Examples 6-10, the base liquid viscosities are 2 Pa.s, 1 Pa.s, 0.2 Pa.s, 0.1 Pa.s and 0.05 Pa.s, respectively, and the remaining process parameters and steps are the same as those in Example 1.

[0068] Embodiment 11

[0069] A foam sand consolidating agent, which differs from Example 1 only in that the added amount of DMP-30 is 5 parts by weight, and the other components and added amounts are the same as those in Example 1.

[0070] A method for preparing a foam sand consolidating agent, which differs from Example 1 only in that the amount of DMP-30 added in step (2) is the amount provided in this example, and the other process parameters and steps are the same as those in Example 1.

[0071] Comparative Example 1

[0072] A foam sand consolidating agent, which differs from Example 1 only in that the added amount of dodecyldimethylamine betaine is 0.5 parts by weight, and the other components and added amounts are the same as those in Example 1.

[0073] A method for preparing a foam sand consolidating agent, which differs from Example 1 only in that the amount of dodecyldimethylamine betaine in step (2) is the amount provided in this comparative example, and the other process parameters and steps are the same as those in Example 1.

[0074] Comparative Example 2

[0075] A foam sand consolidating agent, which differs from Example 1 only in that the added amount of DMP-30 is 15 parts by weight, and the other components and added amounts are the same as those in Example 1.

[0076] A method for preparing a foam sand consolidating agent, which differs from Example 1 only in that the amount of DMP-30 added in step (2) is the amount provided in this comparative example, and the other process parameters and steps are the same as those in Example 1.

[0077] Foam sand consolidation agent performance test:

[0078] (1) Foaming performance test: The foamed sand consolidating agents provided in Examples 1-10 and Comparative Example 1 were stirred at 8000 rad / min for 5 min, and the foam comprehensive value of the foamed sand consolidating agents was tested. The specific test method of the foam comprehensive value can be referred to CN102455350A; the results are as follows: Figure 1 The foaming performance bar graph of the foam sand consolidating agent provided in Examples 1-5 and Comparative Example 1 and Figure 2 The foaming performance bar graphs of the foam sand consolidating agents provided in Examples 1 and 6-10 show that Figure 1It can be seen that there is an optimal value for the addition amount of dodecyldimethylamine betaine, which is determined by the critical micelle concentration (CMC). When the addition amount of dodecyldimethylamine betaine is 2 parts by weight, the foaming effect of the foam sand consolidating agent is the best.

[0079] Depend on Figure 2 It can be seen that with the increase of the proportion of distilled water in the foamed sand consolidating agent, the foaming effect of the foamed sand consolidating agent first improves and then deteriorates. When the ratio of epoxy resin to distilled water is 5:4, the foaming effect of the foamed sand consolidating agent is the best. This is mainly because the larger the proportion of epoxy resin, the greater the viscosity of the base liquid and the greater the difficulty of foaming. Therefore, the foaming effect of the foamed sand consolidating agent deteriorates. When the proportion of distilled water in the base liquid increases, on the one hand, the viscosity of the base liquid decreases, which is conducive to foaming. On the other hand, more liquid films can be formed, resulting in an increase in the foaming volume and a better foaming effect. However, when the proportion of distilled water continues to increase, the viscosity of the liquid film decreases, the drainage speed of the foam becomes faster, the half-life decreases, the foam stability deteriorates, and the foaming effect deteriorates. In addition, an increase in the proportion of distilled water will lead to a decrease in the resin content in the foamed sand consolidating agent, thereby affecting the sand consolidation strength. Therefore, the proportion of distilled water in the foamed sand consolidating agent has an important influence on the foaming effect.

[0080] (2) Curing test: The foamed sand consolidating agents provided in Example 1, Example 11 and Comparative Example 2 were poured into the same container, which contained 100 g of composite quartz sand of different particle sizes, and the gaps between the composite quartz sands were filled with saturated brine (concentration 25%, density 1.22 g / cm 3 ), and cured at 50°C. The curing results are shown in Table 1. Figure 3 Microscopic image and Figure 4 Another microscopic image of the combined quartz sand cemented and solidified using the foamed sand consolidating agent provided in Example 1 is shown as follows:

[0081] Table 1

[0082]

[0083] It can be seen from Table 1 that when the addition amount of accelerator DMP-30 is 10 parts by weight, the curing time of the foam sand consolidating agent is the shortest 2 days; Figure 3 and Figure 4 It can be seen that by using the foamed sand consolidating agent provided in Example 1, the sand body is consolidated uniformly and firmly.

[0084] (3) Sand consolidation and sand control performance test: The foamed sand consolidating agent provided in Example 1 was tested for its sand consolidation and sand control performance through a simulation experiment. The simulation experiment apparatus is as follows: Figure 5As shown in the indoor simulated sediment injection foam curing agent bonding experimental device, the simulation experiment process is as follows: ① Use a glass sand-filled tube to simulate the salt cave cavity, and preset a plexiglass tube in the center to simulate the brine drainage column; fill the glass sand-filled tube with 100g of combined quartz sand of different particle sizes, and the quartz sand is filled with saturated brine to simulate the cavity bottom sediment; ② Place the entire simulation device in a water bath thermostat, and control the water bath temperature at about 50°C. The water bath temperature can be adjusted and controlled in real time according to the experimental requirements; ③ Use a syringe to squeeze the foam sand-fixing agent provided in Example 1 into the glass sand-filled tube, wait for 2 days to simulate the injection of the foam sand-fixing agent into the salt cave sediment, and cement and solidify the sediment particles around the brine drainage column; ④ Simulate the injection by pushing the syringe handle downward to move ⑤ When the conical flask is filled with 250 mL of brine, the gas injection and brine removal time and the sand discharge in the conical flask are measured and recorded; ⑥ After 4 measurements, the gas injection and brine removal simulation experiment is stopped, the glass sand-filled tube is opened, the organic glass tube inside is taken out, and the bonding of the sand particles around it is observed; ⑦ According to the experimental data such as the bonding of the quartz sand around the organic glass tube and the sand discharge in the conical flask, the sand consolidation and sand prevention effects of the foam sand consolidating agent provided by the present invention in simulating the discharge of brine from salt cavity sediment can be comprehensively analyzed. The simulation experiment results are shown in Tables 2 and Figure 6 The cementation and sand consolidation effect of the foamed sand consolidating agent provided in Example 1 around the simulated brine removal pipe column in the room is shown as follows:

[0085] Table 2

[0086] experiment Time taken to drain 250mL of brine / s Sand output / g 1 25.5 0.19 2 78.6 0.01 3 160 0.03 4 450 0.22 total 714.1 0.45

[0087] From Table 2 and Figure 6 It can be seen that when 1000 mL of brine is discharged cumulatively, the total time taken is 714.1 s, the cumulative sand output is 0.45 g, and the sand output rate is only 0.45%. The foam sand consolidating agent provided by the present invention has good foaming and bonding properties. After the sediment particles are adsorbed and solidified around the brine discharge column, the formed sand-control barrier has good permeability and good sand-control effect.

[0088] The applicant declares that the present invention illustrates the detailed process flow of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed process flow, that is, it does not mean that the present invention must rely on the above-mentioned detailed process flow to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A foam sand consolidating agent, characterized in that: The foamed sand consolidating agent comprises the following components in parts by weight:

2. The foamed sand consolidating agent according to claim 1, characterized in that: The epoxy resin includes epoxy resin E51; Preferably, the curing agent includes anhydrides and / or amines; Preferably, the acid anhydride comprises 4-methyl-1,2-cyclohexanedicarboxylic anhydride; Preferably, the amines include any one of 650 epoxy resin curing agent, 651 epoxy resin curing agent or H-113 modified aromatic amine epoxy curing agent, or a combination of at least two thereof.

3. The foamed sand consolidating agent according to claim 1 or 2, characterized in that: The emulsifier includes dodecylphenol polyoxyethylene ether; Preferably, the foaming agent includes any one of polysorbate 80, sodium lauryl sulfate, lauryl amide propyl hydroxysulfonate betaine or dodecyl dimethylamino betaine, or a combination of at least two thereof, and dodecyl dimethylamino betaine is further preferred.

4. The foamed sand consolidating agent according to any one of claims 1 to 3, characterized in that: The foam stabilizer comprises a combination of a polymer foam stabilizer and a granular foam stabilizer; Preferably, the polymer foam stabilizer includes any one of PEG-2000, PEG-6000, PEG-10000, PVA1788 or hydroxyethyl cellulose; Preferably, the polymer foam stabilizer is 0.5-3 parts by weight.

5. The foamed sand consolidating agent according to claim 4, characterized in that: The granular foam stabilizer comprises nano silicon dioxide.

6. The foamed sand consolidating agent according to any one of claims 1 to 5, characterized in that: The foamed sand consolidating agent also includes an accelerator; Preferably, based on 100 parts by weight of the epoxy resin, the mass of the accelerator is ≤13 parts by weight; Preferably, the accelerator includes any one of 2,4,6-tris(dimethylaminomethyl)phenol, methyldibenzylamine or an organic phosphorus / bromine complex or a combination of at least two thereof.

7. The foamed sand consolidating agent according to any one of claims 1 to 6, characterized in that: The foamed sand consolidating agent also includes a solvent; Preferably, the mass ratio of the epoxy resin to the solvent is 1:(0.4-0.8); Preferably, the solvent comprises water.

8. A method for preparing the foamed sand consolidating agent according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: (1) mixing an epoxy resin and an emulsifier and emulsifying them to obtain an emulsion, and adding a solvent to the emulsion to obtain a base liquid; (2) The base liquid obtained in step (1), a curing agent, an optional accelerator, a foaming agent and a foam stabilizer are mixed to obtain the foam sand consolidating agent.

9. The preparation method according to claim 8, characterized in that: The emulsification temperature is 70-80°C; Preferably, the emulsification time is 5-30 min; Preferably, the emulsification is carried out under stirring; Preferably, the stirring speed is 5000-8000r / min; Preferably, the viscosity of the base liquid is 0.05-2 Pa.s.

10. Use of the foamed sand consolidating agent according to any one of claims 1 to 7, characterized in that: Application of the foamed sand consolidating agent in the expansion of brine from the bottom sediment of the salt cavern gas storage cavity; Preferably, the curing temperature of the foam sand consolidating agent is 25-50°C; Preferably, the curing time of the foamed sand consolidating agent is 2-5 days.

Images