CN115785933A - Salt-inhibiting foam scrubbing agent for exploitation of high-salinity natural gas well and preparation method thereof - Google Patents
Salt-inhibiting foam scrubbing agent for exploitation of high-salinity natural gas well and preparation method thereof Download PDFInfo
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- CN115785933A CN115785933A CN202211468451.9A CN202211468451A CN115785933A CN 115785933 A CN115785933 A CN 115785933A CN 202211468451 A CN202211468451 A CN 202211468451A CN 115785933 A CN115785933 A CN 115785933A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 11
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- 238000002156 mixing Methods 0.000 claims abstract description 34
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- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a salt-inhibiting foam scrubbing agent for the exploitation of a high-salinity natural gas well and a preparation method thereof; comprises the following components in parts by weight: 30-40 parts of sulfonated AEO3, 10-20 parts of OP-10, 10-20 parts of Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, 5-10 parts of polyaspartic acid, 5-10 parts of ethylene glycol and 3-5 parts of fatty alcohol-polyoxyethylene ether sodium sulfate; during preparation, sulfonated AEO3 and OP-10 are fully reacted, and then cooled to room temperature to prepare a foaming agent; uniformly mixing polyaspartic acid and Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, and cooling to room temperature to obtain a salt inhibitor; then, after the foaming agent, the salt inhibitor and glycol are fully reacted, adding fatty alcohol-polyoxyethylene ether sodium sulfate for reaction, and cooling to prepare the foam scrubbing agent; the foam scrubbing agent has the advantages of strong foamability, high liquid carrying rate and high salt inhibiting efficiency, and can solve the problem of salt blockage in a gas well in a high-salinity area.
Description
Technical Field
The invention relates to the technical field of foam scrubbing agents, in particular to a salt-inhibiting foam scrubbing agent for the exploitation of a high-salinity natural gas well and a preparation method thereof.
Background
The West block coal bed gas (oil gas) exploration and development project of the Ordos basin stone building covers Yonghe county, shilou county and \38576ofthe western region of Shanxi province, and three environments of the county are positioned at the east edge of the Ordos basin where oil gas resources are most abundant in China, and are 46km away from the Ordos basin main power gas field, the Zizhou gas field, the Changbei gas field, the Sulige gas field, the 172km away from the Ziniu gas field and the 140km away from the Daniu land gas field. According to a basic exploratory reserve report of the south of the west region block of the rock-fabricating park disturbed by the west of the ruffled rocky ribbon of the basin of Ore Doss in 2011, which is completed by oil engineering research institute of the Hongkong oil field of China in 12 months, evaluation proves that the basic exploratory reserve of the south of the west region block of the rock-fabricating park is 947.5 billion cubic meters of natural gas, 473.8 billion cubic meters of technically exploratable reserve and 1120 billion cubic meters of basic exploratory reserve of coal bed gas.
Through a large amount of exploration and research works, high-yield industrial airflow is found in stratums such as a Benxi group, a Taiyuan group, a Shanxi group, a stone box group, a Shikuang group and the like in the block, and at present, 3 layers such as 2 sections of the Shanxi group, 1 section of the Shanxi group and 8 stone box groups are determined to be main force target layers, the permeability of the layers exceeds 0.1mD, the porosity of the layers is greater than 4.4%, and the blocks belong to typical large-scale low-porosity and low-permeability gas reservoirs.
The pressure and the yield of the gas well in the block are in a descending trend, the mineralization degree of the formation water is as high as 300g/L, the high salinity formation water belongs to the formation water with extremely high mineralization degree, and a large amount of salt substances are separated out in a shaft and a near-wellbore area due to the changes of the temperature and the pressure in the production process of the high salinity formation water in the block, so that an airflow channel is blocked, the normal production of the gas well is seriously influenced, meanwhile, huge economic loss is brought, and the development of the oil and gas field is seriously hindered. In order to solve the salt blockage phenomenon and the problem of gas well shaft effusion, a foam discharging agent with a salt inhibiting function is required to be used, however, the highest mineralization resistance of the foam discharging agent in the prior art is 200g/L, when the foam discharging agent is applied to the formation water in the block, the foam discharging agent is found to have serious defects of liquid carrying and foaming performance, and the problem of salt blockage is difficult to effectively solve, so that the foam discharging agent in the prior art is difficult to be directly applied to the gas well in a high-salinity area such as West blocks of Erdos basin quarrys.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a salt-inhibiting foam discharging agent for the exploitation of a high-salinity natural gas well and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
a salt-inhibiting foam scrubbing agent comprises the following components in parts by weight:
30 to 40 portions of sulfonated AEO 3 10-20 parts of OP-10, 10-20 parts of Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, 5-10 parts of polyaspartic acid, 5-10 parts of ethylene glycol and 3-5 parts of fatty alcohol polyoxyethylene ether sodium sulfate.
Sulfonated AEO 3 The water-soluble polymer has the characteristics of a non-ionic-anionic surfactant and has strong foaming and liquid carrying capacities, however, the mineralization degree of high-mineralization formation water is generally higher than 200g/L, and interference of condensate oil, methanol and other substances on a foam scrubbing agent exists, so that only sulfonated AEO is used in the environment 3 On the basis, OP-10 is introduced as an anionic foaming aid, and has emulsification and hard water resistance on interfering substances such as condensate oil, so that surfactant molecules are orderly distributed and arranged in a liquid film of bubbles, and the bubbles are endowed with good elasticity and self-repairing capability; on the basis, the sodium fatty alcohol polyoxyethylene ether sulfate is continuously introduced as the foam stabilizer, so that the molecular layers orderly arranged in the interfacial film are more tightly combined, the film strength is improved, and the knot of the bubble liquid film is further controlledStructural stability, making the foam difficult to break. However, in practical application, a high-salinity gas well generally has a well depth of more than 3000 meters, the foam discharging agent is injected for about 2 to 3 hours and flows to the bottom of the well, and then the foam discharging agent is returned along with production, in the process of returning the production, the temperature and the pressure are reduced, salt precipitation and crystallization phenomena occur, and a crystalline substance is easy to damage the foam stability and influence the foam discharging performance, so that the foam discharging effect of a high-salinity water layer is still difficult to continuously and stably realize only by adopting the raw materials; on the basis, a Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer is introduced as a main salt inhibiting agent, which has stronger salt inhibiting and scale inhibiting capabilities under the condition of high salinity, and the binary polymer contains carboxylic acid groups and sulfonic acid groups, wherein the carboxylic acid groups have stronger chelating capabilities on easily-scaling ions (such as calcium, magnesium, iron and the like), not only have dispersing and condensing effects, but also can generate lattice distortion effect on microcrystals, thereby achieving the purposes of salt inhibiting and scale prevention; the sulfonic acid group has the characteristics of high temperature resistance, high salt content and the like, is not easy to decompose below 300 ℃, and has good thermal stability. In addition, the application environment of the invention is a complex high-salinity gas well formation water system, the concentration of scale-prone ions is high, and the continuous and effective salt inhibiting effect is difficult to exert only through compounding the raw materials, so that the foam discharging effect is not very ideal. In addition, the liquid foam discharging agent obtained by compounding the raw materials is viscous and turbid in state at low temperature, and poor in compatibility, and in order to solve the technical problem, on the basis, the ethylene glycol is introduced, so that the compatibility among the raw materials can be effectively improved, the frost resistance of the salt inhibiting foam discharging agent in winter can be improved, and the adaptability of the salt inhibiting foam discharging agent in northern high-cold areas can be further improved.
Through mutual compatibility of the raw materials, the prepared foam discharging agent can adapt to a high-salinity water layer, has strong foamability, high liquid carrying rate, high salt inhibition rate and frost resistance, can adapt to high-salinity stratum water such as western rockfill district to a great extent, and effectively solves the technical problems of low foamability and liquid carrying ability of the foam discharging agent in the high-salinity stratum water (such as stratum water of western rockfill district) and pipeline blockage caused by salting out.
Preferably, the salt-inhibiting foam-discharging agent comprises the following components in parts by weight:
33 to 38 parts of sulfonated AEO3, 14 to 19 parts of OP-10, 12 to 17 parts of Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, 6 to 8 parts of polyaspartic acid, 7 to 9 parts of ethylene glycol and 3.5 to 4.5 parts of fatty alcohol-polyoxyethylene ether sodium sulfate.
Preferably, the salt-inhibiting foam scrubbing agent comprises the following components in parts by weight:
36 parts of sulfonated AEO3, 17 parts of OP-10, 15 parts of Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, 6.5 parts of polyaspartic acid, 8 parts of ethylene glycol and 4 parts of fatty alcohol-polyoxyethylene ether sodium sulfate.
In addition, in order to realize the purpose, the invention also provides a preparation method of the salt-inhibiting foam-scrubbing agent, which comprises the following steps:
s1, uniformly mixing sulfonated AEO3 and OP-10, fully reacting, and cooling to room temperature to prepare a foaming agent;
s2, uniformly mixing polyaspartic acid and Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, and cooling to room temperature to obtain a salt inhibitor;
s3, uniformly mixing the foaming agent and the salt inhibitor, fully reacting, adding ethylene glycol, and uniformly mixing to obtain the foam scrubbing agent.
S4, uniformly mixing the foaming agent and the salt inhibitor glycol, fully reacting, adding fatty alcohol-polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to obtain the salt inhibitor foam discharging agent.
Preferably, in the S1, the reaction temperature of the sulfonated AEO3 and the OP-10 is 55-66 ℃, and the reaction time is 2.8-3.2h. Under the temperature and time, the sulfonated AEO3 can fully react with OP-10, thereby improving the foaming and liquid carrying capacity.
Preferably, in the S1, the reaction temperature of the sulfonated AEO3 and the OP-10 is 60 ℃, and the reaction time is 3 hours.
Preferably, in S3, the reaction temperature of the foaming agent, the salt inhibitor and the glycol is 68-75 ℃, and the reaction time is 3.5-4.5h.
The foaming agent, the salt inhibitor and the glycol can fully react at the temperature and time, and then the foaming, liquid carrying and salt inhibiting capabilities are improved.
Preferably, in S3, the reaction temperature of the foaming agent, the salt inhibitor and the ethylene glycol is 70 ℃, and the reaction time is 4 hours.
Compared with the prior art, the invention has the beneficial effects that:
1. the foam discharging agent disclosed by the invention has the advantages of strong foaming property, high liquid carrying rate and high salt inhibiting efficiency in a high-salinity gas well, and can solve the problems of low foaming and liquid carrying performances of the foam discharging agent in high-salinity formation water (such as formation water in west blocks of Stokes) and simultaneously solve the technical problem of pipeline blockage caused by salting out; experiments show that the foam scrubbing agent has the advantages that in high-salinity formation water with the mineralization degree of 200-350g/L, the foaming force is kept at 155-180mm, the liquid carrying rate is kept at 80-88%, and in the mineralization degree, as the mineralization degree rises, the foaming force and the liquid carrying rate have no obvious descending trend, so that the defects that as the mineralization degree rises, the foaming and liquid carrying rates of the foam scrubbing agent in the prior art show obvious descending trends and even completely lose efficacy are overcome; in addition, experiments prove that the salt inhibition rate of the foam scrubbing agent is not lower than 92.56%.
2. The foam scrubbing agent has the advantages that the raw materials are single and easy to obtain, and the environment cannot be polluted when the foam scrubbing agent is used; the preparation method is simple and suitable for large-scale production.
Drawings
FIG. 1: a salt inhibition effect graph;
FIG. 2: a gas flow channel blockage map;
FIG. 3: and (5) an experimental effect graph.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. The preparation of the salt rejection inhibitor of the present application is further described in detail with reference to the following embodiments; it is worth mentioning that: the various starting materials in the examples are all commercially available products.
Example 1
S1, uniformly mixing 40 parts of sulfonated AEO3 and 12 parts of OP-10, reacting for 2.8 hours at 66 ℃, and then cooling to room temperature to prepare a foaming agent; uniformly mixing 10 parts of polyaspartic acid and 18 parts of Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, and cooling to room temperature to obtain a salt inhibitor;
s2, uniformly mixing the foaming agent, the salt inhibitor and 7 parts of glycol, reacting at 68 ℃ for 4.5 hours for full reaction, then adding 3 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to obtain the salt-inhibiting foam discharging agent.
Example 2
S1, uniformly mixing 37 parts of sulfonated AEO3 and 14 parts of OP-10, reacting for 3.1h at 58 ℃, and cooling to room temperature to prepare a foaming agent; uniformly mixing 8 parts of polyaspartic acid and 18 parts of Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, and cooling to room temperature to prepare a salt inhibitor;
s2, uniformly mixing the foaming agent, the salt inhibitor and 8 parts of glycol, reacting for 4.2 hours at 72 ℃, adding 4.5 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to obtain the salt inhibitor foam discharging agent.
Example 3
S1, uniformly mixing 36 parts of sulfonated AEO3 and 17 parts of OP-10, reacting for 3 hours at 60 ℃, and cooling to room temperature to prepare a foaming agent; uniformly mixing 6.5 parts of polyaspartic acid and 15 parts of Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, and cooling to room temperature to obtain a salt inhibitor;
s2, uniformly mixing the foaming agent, the salt inhibitor and 8 parts of glycol, reacting for 4 hours at 70 ℃, sufficiently reacting, then adding 4 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to obtain the salt inhibitor foam discharging agent.
Example 4
S1, uniformly mixing 40 parts of sulfonated AEO3 and 12 parts of OP-10, reacting for 3 hours at 60 ℃, and cooling to room temperature to prepare a foaming agent; uniformly mixing 10 parts of polyaspartic acid and 8 parts of Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, and cooling to room temperature to obtain a salt inhibitor;
s2, uniformly mixing the foaming agent, the salt inhibitor and 7 parts of glycol, reacting for 4 hours at 70 ℃, sufficiently reacting, then adding 3 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to obtain the salt inhibitor foam discharging agent.
It is worth mentioning that: the preparation method of the Maleic Anhydride (MA)/sodium p-styrene sulfonate (SSS) binary polymer in the above examples 1-4 is the prior art, that is, the polymer is obtained by polymerization using Maleic Anhydride (MA) and sodium p-styrene sulfonate (SSS) as raw materials, ammonium persulfate as initiator, and sodium hypophosphite as chain transfer agent.
Comparative example 1
S1, uniformly mixing 15 parts of sulfonated AEO3 and 20 parts of OP-10, reacting for 2.8 hours at 66 ℃, and cooling to room temperature to prepare a foaming agent; uniformly mixing 3 parts of polyaspartic acid and 8 parts of Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, and cooling to room temperature to obtain a salt inhibitor;
s2, uniformly mixing the foaming agent, the salt inhibitor and 5 parts of glycol, reacting at 68 ℃ for 4.5 hours for full reaction, then adding 3 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to obtain the salt-inhibiting foam discharging agent.
Comparative example 2
S1, uniformly mixing 15 parts of sulfonated AEO3 and 20 parts of OP-10, reacting at 66 ℃ for 2.8 hours, cooling to room temperature, adding 3 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to obtain the foam discharging agent.
Comparative example 3
Conventional foam scrubbing agent
Experimental example 1 measurement of foaming ability and foam stabilizing ability (measured by the Roche foam tester method)
2.0g of the foam discharging agent in the examples 1 to 4 and the comparative examples 1 to 3 are respectively weighed in a 1000mL beaker, a mineralization degree water sample is added to dilute the mixture to 400mL to obtain a sample liquid to be detected with the foam discharging agent concentration of 5.0 thousandths, and the sample liquid to be detected is placed in a constant-temperature water bath and heated to 70 +/-1 ℃ for later use.
Preheating a Roche foam meter in a thermostatic water bath, keeping the temperature at 70 +/-1 ℃, transferring 50mL of sample liquid to be tested by using a 200mL pipette, putting down the wall of a flushing pipe along the wall of the Roche foam meter, closing a valve at the lower end of the Roche foam meter after the flushing liquid flows out, then transferring 50mL of the sample liquid to be tested, putting down along the wall of the Roche foam meter, forming a liquid level at the bottom, transferring 200mL of the sample liquid to be tested by using the pipette, putting the sample liquid to be tested at the central position of the upper end of the Roche foam meter, vertically putting down by aiming at the liquid level, immediately recording the rising height of foam in the Roche foam meter after the sample liquid is put out, and obtaining the foaming capacity of the experimental sample. The foam height after 5min was recorded as the foam stabilizing ability of the experimental sample, and the experimental results are shown in table 1.
Table 1: foaming force and foam stabilizing force test results
As can be seen from table 1: the foam scrubbing agent (the foam scrubbing agent in the examples 1-4) in the invention hardly influences the foaming force and the foam stabilizing force under the condition that the mineralization degree is 200-350 g/L; comparative example 1 is not prepared strictly according to the amount used in the present invention, the foaming and foam stabilizing ability thereof is significantly insufficient, and the foaming and foam stabilizing ability sharply decreases with the increase of the degree of mineralization; the foam scrubbing agent in the comparative example 2 has almost the same foaming capacity as the foam scrubbing agent of the invention when the degree of mineralization is 200g/L, but the foam stabilizing and foaming performances are obviously reduced along with the increase of the degree of mineralization; under the condition of high salinity, the foaming power and the foam stabilizing power of the conventional foam scrubbing agent in the comparative example 3 are sharply reduced along with the increase of the mineralization degree, and especially the foaming and foam stabilizing capabilities are almost lost after the mineralization degree is higher than 300 g/L. From this, it is understood that the foam discharging agent of the present invention can exert remarkable foaming and foam stabilizing performance under the condition of high salinity.
Experimental example 2 liquid carrying rate test
Weighing 2.0g of the foam discharging agent in each of examples 1 to 4 and comparative examples 1 to 3, placing 1000mL of the foam discharging agent in a beaker, adding a water sample with a mineralization degree to dilute the foam discharging agent to 400mL to obtain a sample liquid to be detected with the concentration of the foam discharging agent of 5.0 thousandths, and placing the sample liquid to be detected in a constant-temperature water bath to heat the sample liquid to 70 +/-1 ℃ for later use.
And (3) preheating the liquid carrying instrument in a constant-temperature water bath, keeping the temperature at 70 +/-1 ℃, starting an inflator pump, filling 8L of gas per minute, pouring the preheated sample liquid to be tested into the constant-temperature liquid carrying instrument to foam the solution, collecting the carried liquid by using a liquid collector until no foam is carried out, and measuring the volume of the carried liquid (the liquid carrying rate = the volume of the carried liquid/the total volume of the sample liquid multiplied by 100 percent), thus obtaining the liquid carrying capacity of the experimental sample. The results of the experiment are shown in table 2.
Table 2: liquid carrying rate test result
As can be seen from table 2: the liquid carrying rate of the foam discharging agent (the foam discharging agent in the embodiments 1-4) in the invention is hardly influenced under the condition that the mineralization degree is 200-350 g/L; comparative example 1 was not prepared exactly as in the present invention, and had a low liquid carrying rate; when the mineralization degree of the foam scrubbing agent in the comparative example 2 is 200g/L, the liquid carrying capacity of the foam scrubbing agent is almost equivalent to that of the foam scrubbing agent, but the liquid carrying capacity of the foam scrubbing agent is obviously reduced along with the increase of the mineralization degree; under the condition of high mineralization degree, the liquid carrying rate of the conventional foam scrubbing agent in the comparative example 3 is sharply reduced along with the increase of the mineralization degree, and particularly the liquid carrying capacity is obviously insufficient after the mineralization degree is higher than 300 g/L. From this, it is understood that the foam discharging agent of the present invention can exhibit a remarkable liquid carrying ability under conditions of high salinity.
EXAMPLE 3 salt suppression test
Preparing supersaturated sodium chloride solution: weighing 500mL of distilled water in a beaker, heating to 90 ℃, adding sodium chloride until the distilled water is supersaturated, and placing the beaker in a constant-temperature water bath at 90 ℃ for later use;
100mL of supersaturated sodium chloride solution is respectively measured and put into 9 beakers, and the number of the beaker is No. 1 to No. 9. Wherein 0.5g of the foam discharging agent in the embodiments 1-4 and the comparative examples 1-3 is respectively added into the No. 1-8 beaker and is uniformly stirred, no foam discharging agent is added into the No. 9 beaker, and after the mixture is uniformly stirred, the mixture is naturally cooled to the room temperature, and the salting-out phenomenon is observed; and filtering, drying and weighing the cooled liquid sample.
Salt inhibiting rate = (amount of salt accumulation without drug-amount of salt accumulation with drug)/amount of salt accumulation without drug × 100%
The test results are shown in table 3.
Table 3: salt rejection test results
It can be known from table 3 that the foam scrubbing agent of the present invention has a very strong salt inhibiting ability, so that the salt precipitation salt blockage phenomenon in a highly mineralized mine can be effectively solved, and the foaming and foaming abilities of the foam scrubbing agent can be ensured to be continuously stable.
The graphs of the salt-suppressing effect in the beakers nos. 3, 7 and 8 are shown in fig. 1, in which No. 3 is shown in fig. 1a, no. 7 is shown in fig. 1b, and No. 8 is shown in fig. 1c, respectively.
Experimental example 4 YH-X well application Effect
YH-X well is located in Yonghe county, bingfen City, west Shanxi province, and the construction location is east edge of the basin of Ordos. The well is drilled in 2016 (9-month-24 days), and is drilled in 10-month-1 days, wherein the vertical depth of the drilled well is 2990.00, the slant depth is 4210.00 (target point B) m, and the drilled layer is immediately divided into five 5 layers.
Because the salinity of the formation water is particularly high and exceeds 300g/L, a large amount of salt substances are separated out in a shaft and a near wellbore area due to the change of temperature and pressure in the production process, an airflow channel is often blocked (as shown in figure 2), and water-mixing salt-cleaning construction is adopted for 3 months on average.
The production data of 2021 year, 5 months, 11 days to 17 days are counted, the average oil pressure of the well production is 1.43MPa, the casing pressure is 5.69MPa, and the daily average yield isAir volume 3252m 3 The well has unstable production and can not carry liquid by itself, pressure reduction and liquid carrying are required to be frequently adopted, particularly for 5 months and 16 to 17 days, the gas production rate of the well is lower than 1000m 3 And d. The well bore has serious effusion and is in a water flooded state.
In 2021, 5, 18 days, salt foam discharge inhibiting agents are injected into the well for the first time (the salt foam discharge inhibiting agents in the experimental example 4 are all foam discharge agents in the example 1), considering that accumulated liquid in the well bore is serious and is in a water flooded state, the injection concentration is properly improved, 45L of the salt foam discharge inhibiting agents (foam discharge: water =1 3 Production liquid 8.54m 3 。
And injecting 45L of the salt-inhibiting foam discharging agent from the wellhead oil for 3 consecutive days (foam discharging: water =1 3) from 5 months and 18 days to 20 days, obviously improving the gas well production after implementing the foam discharging of the first stage, and generating gas in 16243m in an accumulated manner for three days 3 Cumulative liquid production 30.04m 3 。
And 5, 21 days to 6, 15 days, 40L of salt inhibiting foam discharging agent is injected into the well mouth every day by using a well mouth automatic injection device (foam discharging: water =1: 3), the gas well is stable in production, and the gas is generated in 6232m every day 3 Average daily liquid production of 10.90m 3 。
The graph of the experimental effect of experimental example 4 is shown in fig. 3.
In addition, the conventional foam-exhausting agent was also compared with the foam-exhausting agent in example 1, and the results are shown in table 4.
Table 4: test effect comparison table
The YH-X well is stably produced from 2021 month 6 till now by adding the salt-inhibiting foam discharging agent, and the phenomenon of pipeline blockage due to salt formation does not occur.
The foregoing is merely a preferred embodiment of the invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to limit the invention to other embodiments, and to various other combinations, modifications, and environments and may be modified within the scope of the inventive concept as expressed herein, by the teachings or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The salt-inhibiting foam scrubbing agent for the exploitation of the high-salinity natural gas well is characterized by comprising the following components in parts by weight:
30-40 parts of sulfonated AEO 3 10-20 parts of OP-10, 10-20 parts of Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, 5-10 parts of polyaspartic acid, 5-10 parts of ethylene glycol and 3-5 parts of fatty alcohol polyoxyethylene ether sodium sulfate.
2. The salt-rejection foam drainage agent for the exploitation of a highly mineralized natural gas well according to claim 1, which comprises the following components in parts by weight:
33-38 parts of sulfonated AEO3, 14-19 parts of OP-10, 12-17 parts of Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, 6-8 parts of polyaspartic acid, 7-9 parts of ethylene glycol and 3.5-4.5 parts of fatty alcohol-polyoxyethylene ether sodium sulfate.
3. The salt-suppressing foam discharging agent for the exploitation of a highly mineralized natural gas well according to claim 1, which is characterized by comprising the following components in parts by weight:
36 parts of sulfonated AEO3, 17 parts of OP-10, 15 parts of Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, 6.5 parts of polyaspartic acid, 8 parts of ethylene glycol and 4 parts of fatty alcohol-polyoxyethylene ether sodium sulfate.
4. The preparation method of the salt-inhibiting foam scrubbing agent for the exploitation of a highly mineralized natural gas well according to any one of claims 1 to 3, characterized by comprising the following steps:
s1, uniformly mixing sulfonated AEO3 and OP-10, fully reacting, and cooling to room temperature to prepare a foaming agent; uniformly mixing polyaspartic acid and Maleic Anhydride (MA)/Sodium Styrene Sulfonate (SSS) binary polymer, and cooling to room temperature to prepare a salt inhibitor;
s2, uniformly mixing the foaming agent, the salt inhibitor and glycol for full reaction, then adding the fatty alcohol-polyoxyethylene ether sodium sulfate for uniform mixing, and cooling to room temperature to prepare the salt inhibitor foam displacement agent.
5. The method for preparing the salt rejection foam-displacement inhibitor for the exploitation of the highly mineralized natural gas well according to the claim 4, wherein the reaction temperature of the sulfonated AEO3 and the OP-10 in the S1 is 55-66 ℃, and the reaction time is 2.8-3.2h.
6. The method for preparing the salt rejection foam-discharging agent for the exploitation of a highly mineralized natural gas well according to claim 5, wherein the reaction temperature of sulfonated AEO3 and OP-10 in S1 is 60 ℃ and the reaction time is 3h.
7. The method for preparing the salt rejection foam discharging agent for the exploitation of a highly mineralized natural gas well according to claim 4, wherein in the step S3, the reaction temperature of the foaming agent, the salt rejection agent and the ethylene glycol is 68-75 ℃, and the reaction time is 3.5-4.5h.
8. The method for preparing the salt-suppressing foam discharging agent for the exploitation of the highly mineralized natural gas well according to claim 7, wherein in S3, the reaction temperature of the foaming agent, the salt-suppressing agent and the ethylene glycol is 70 ℃, and the reaction time is 4 hours.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104830303A (en) * | 2015-05-05 | 2015-08-12 | 中国石油天然气股份有限公司 | Corrosion and scale inhibition foaming drainage agent and preparation method and application thereof |
| CN107010740A (en) * | 2017-06-12 | 2017-08-04 | 西安工程大学 | A kind of sewage disposal antisludging agent and preparation method thereof |
| CN113528110A (en) * | 2021-08-24 | 2021-10-22 | 成都钠镁化学有限公司 | Foam drainage agent for exploitation of ancient sulfur-containing natural gas and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104830303A (en) * | 2015-05-05 | 2015-08-12 | 中国石油天然气股份有限公司 | Corrosion and scale inhibition foaming drainage agent and preparation method and application thereof |
| CN107010740A (en) * | 2017-06-12 | 2017-08-04 | 西安工程大学 | A kind of sewage disposal antisludging agent and preparation method thereof |
| CN113528110A (en) * | 2021-08-24 | 2021-10-22 | 成都钠镁化学有限公司 | Foam drainage agent for exploitation of ancient sulfur-containing natural gas and preparation method thereof |
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