CN115785933B - Salt-inhibiting foam discharging agent for high-mineralization natural gas well exploitation and preparation method thereof - Google Patents
Salt-inhibiting foam discharging agent for high-mineralization natural gas well exploitation and preparation method thereof Download PDFInfo
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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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- Detergent Compositions (AREA)
Abstract
The invention discloses a salt-inhibiting foam discharging agent for high-mineralization natural gas well exploitation 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 p-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, fully reacting sulfonated AEO3 with OP-10, and then cooling to room temperature to prepare a foaming agent; uniformly mixing polyaspartic acid and Maleic Anhydride (MA)/sodium p-styrenesulfonate (SSS) binary polymer, and cooling to room temperature to obtain a salt inhibitor; then fully reacting the foaming agent, the salt inhibitor and the ethylene glycol, adding fatty alcohol polyoxyethylene ether sodium sulfate for reaction, and cooling to obtain a foam discharging agent; the foam discharging agent has strong foamability, high liquid carrying rate and high salt inhibition efficiency, and can solve the problem of salt blockage in a gas well in a hypersalinity area.
Description
Technical Field
The invention relates to the technical field of foam discharging agents, in particular to a salt-inhibiting foam discharging agent for high-mineralization natural gas well exploitation and a preparation method thereof.
Background
The Huidos basin Shilouxi block coalbed methane (oil gas) exploration and development project covers Yonghe county, shilou county and/38576/county in the middle and west of Shanxi province, is located at the eastern border of the Huidos basin with the most abundant oil and gas resources in China, and is 46km from the Huidos basin main strength Tian Zizhou gas field, 163km from the long north gas field, 172km from the Su Lige gas field and 140km from the large Niu Deqi field. According to the basic reserve report of the southern part of the ShiLou block of the Hull Zhenhui Jishi, which is finished by the oil field oil engineering institute of China Petroleum port, 12 months 2011, the evaluation proves that the basic reserve of the natural gas in the southern part of the ShiLou block is 947.5 hundred million cubic meters, the technical recoverable reserve is 473.8 hundred million cubic meters and the basic reserve of the coalbed methane is 1120 hundred million cubic meters.
Through a large amount of exploration and research work, the block finds high-yield industrial air flow in strata such as a Benxi group, a Taiyuan group, a Shanxi group, a stone box group and a Dan Qianfeng group, 3 layers such as a Shanxi group mountain 2 section, a Shanxi group mountain 1 section, a stone box group box 8 and the like are determined to be main target layers, and the block has a permeability of more than 0.1mD and a porosity of more than 4.4 percent and belongs to a typical large-scale low-hole low-permeability air reservoir.
The pressure and the yield of the gas well of the block are in a descending trend, the mineralization degree of the formation water is as high as 300g/L, the formation water belongs to the formation water with ultra-high mineralization degree, and a large amount of salt substances are precipitated in a shaft and a near-well zone due to the change of temperature and pressure in the production process of the formation water of the block, so that an airflow channel is blocked, the normal production of the gas well is seriously affected, and meanwhile, great economic loss is brought, and the development of an oil-gas field is seriously hindered. In order to solve the salt plugging phenomenon and the problem of liquid accumulation in a well shaft of a gas well, a foam discharging agent with a salt inhibition function is needed, 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 stratum water of the block, the foam discharging agent is found to have serious insufficient liquid carrying and foaming performance, and the problem of salt plugging 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 mineralization area such as a Dan Louxi block of a Hull basin.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a salt-inhibiting foam discharging agent for high-mineralization natural gas well exploitation and a preparation method thereof, wherein the foam discharging agent has strong foaming property, high liquid carrying rate and high salt-inhibiting efficiency, and can effectively solve the problem of salt blockage in a gas well in a high-mineralization area such as a Dan Louxi block of a Huddos basin.
The aim of the invention is realized by the following technical scheme:
the salt-inhibiting foam discharging agent comprises 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 p-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.
Sulphonated AEO 3 The nonionic-anionic surfactant has strong foaming and liquid carrying capacity, however, because the mineralization degree of the formation water with high mineralization degree is generally higher than 200g/L, and the interference of condensate oil, methanol and other substances on the foam discharging agent exists, under the environment, the foam discharging agent is formed by sulfonation of AEO 3 The purposes of strong foamability and high liquid carrying rate are difficult to realize, and on the basis, OP-10 is introduced as an anionic foaming aid, which has emulsifying and hard water resisting properties on condensate oil and other interfering substances, so that surfactant molecules are orderly distributed and arranged on a liquid film of bubbles, and good elasticity and self-repairing capability are provided for the foam; on the basis, the fatty alcohol-polyoxyethylene ether sodium sulfate is continuously introduced as a foam stabilizer, so that orderly arranged molecular layers in the interfacial film are combined more tightly, the film strength is improved, the structural stability of a bubble liquid film is further controlled, and the foam is difficult to break. However, in practical application, the high-mineralization gas well is generally deeper than 3000 m, the foam discharging agent is filled into the well bottom for about 2-3 hours and flows to the well bottom, and then the high-mineralization gas well is returned with production, in the process of returning out of production, the temperature and the pressure are reduced, so that salt precipitation and crystallization phenomena occur, the foam stability of crystalline substances is easily damaged, and the foam discharging performance is influenced, therefore, the foam discharging performance is still difficult to hold by only using the raw materialsContinuously and stably realizing the foam discharging effect of the high-mineralization water layer; on the basis, maleic Anhydride (MA)/sodium p-styrenesulfonate (SSS) binary polymer is introduced as a salt inhibition main agent, and the binary polymer has stronger salt inhibition and scale inhibition capability under the condition of hypersalinity, and contains carboxylic acid groups and sulfonic acid groups, wherein the carboxylic acid groups have stronger chelating capability on scale-prone ions (such as calcium, magnesium, iron and the like), have dispersion and agglomeration effects, and can also generate lattice distortion effect on microcrystals, so that the purposes of salt inhibition and scale inhibition are achieved; the sulfonic acid group has the characteristics of high temperature resistance, high salt 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 mineralization gas well stratum water system, the concentration of the scale-prone ions is higher, the continuous and effective salt inhibition effect is difficult to be exerted only by compounding the raw materials, so that the foam discharging effect is not quite ideal, on the basis, polyaspartic acid is introduced as a solubilizer, and the solubility of the scale-prone ions is increased due to the fact that amide groups contained in the polyaspartic acid have stronger capability of dispersing crystals, the salt inhibition effect is further improved, and the salt inhibition continuous performance is further improved. In addition, the liquid foam discharging agent obtained after the raw materials are compounded is sticky and turbid in state and poor in compatibility under the low-temperature condition, so that the technical problem is solved, on the basis, ethylene glycol is introduced, the compatibility among the raw materials can be effectively improved, meanwhile, the freezing 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 alpine regions is further improved.
Through mutual compatibility of the raw materials, the prepared foam discharging agent can adapt to a water layer with high mineral degree, has the advantages of strong foamability, high liquid carrying rate, high salt inhibition rate and freezing resistance, can be greatly adapted to high mineral degree stratum water such as a Shimey block, and can effectively solve the technical problems of foaming and low liquid carrying performance of the foam discharging agent in the high mineral degree stratum water (such as the stratum water of the Shimey block) and pipeline blockage caused by salting out.
Preferably, the salt suppression 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 p-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.
More preferably, the salt suppression foam discharging 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 p-styrene sulfonate (SSS) binary polymer, 6.5 parts of polyaspartic acid, 8 parts of ethylene glycol and 4 parts of sodium fatty alcohol polyoxyethylene ether sulfate.
In addition, in order to achieve the purpose, the invention also provides a preparation method of the salt-inhibiting foam discharging 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 p-styrenesulfonate (SSS) binary polymer, and cooling to room temperature to prepare a salt inhibitor;
and S3, uniformly mixing the foaming agent and the salt inhibitor, fully reacting, adding glycol, and uniformly mixing to obtain the foam discharging agent.
And 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 inhibition foam discharging agent.
Preferably, in the step S1, the reaction temperature of the sulfonated AEO3 and OP-10 is 55-66 ℃ and the reaction time is 2.8-3.2h. The temperature and time can lead the sulfonated AEO3 to fully react with OP-10, thereby improving the foaming and liquid carrying capacity.
More preferably, in the step S1, the reaction temperature of the sulfonated AEO3 and OP-10 is 60 ℃ and the reaction time is 3 hours.
Preferably, in the step 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 ethylene glycol can fully react at the temperature and for a period of time, so that the foaming, liquid carrying and salt inhibition capability is improved.
More preferably, in the step 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 has strong foamability, high liquid carrying rate and high salt inhibition efficiency in a high-mineralization gas well, can solve the problems of low foam forming and liquid carrying performance of the foam discharging agent in high-mineralization stratum water (such as stratum water of a stone building block), and solves the technical problem of pipeline blockage caused by salting out; experiments show that the foaming agent in the invention has the foaming force kept at 155-180mm and the liquid carrying rate kept at 80-88% in high mineralization stratum water with the mineralization degree of 200-350g/L, and has no obvious descending trend of the foaming force and the liquid carrying rate along with the increase of the mineralization degree in the mineralization degree, thereby overcoming the defects that the foaming agent and the liquid carrying rate show obvious descending trend and even completely fail along with the increase of the mineralization degree in the prior art; in addition, experiments prove that the salt inhibition rate of the foam discharging agent is not lower than 92.56 percent.
2. The foam discharging agent has single and easily obtained raw materials, and can not pollute the environment when in use; the preparation method is simple and is suitable for large-scale production.
Drawings
Fig. 1: a salt inhibition effect diagram;
fig. 2: a flow channel blockage map;
fig. 3: experimental effect graph.
Detailed Description
The following will clearly and fully describe the technical solutions in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. The preparation of the salt-inhibiting foam discharging agent is described in further detail below with reference to the specific embodiments; noteworthy are: the various 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 cooling to room temperature to prepare a foaming agent; uniformly mixing 10 parts of polyaspartic acid and 18 parts of Maleic Anhydride (MA)/sodium p-styrenesulfonate (SSS) binary polymer, and cooling to room temperature to prepare a salt inhibitor;
s2, uniformly mixing the foaming agent, the salt inhibitor and 7 parts of ethylene glycol, reacting for 4.5 hours at 68 ℃ for full reaction, adding 3 parts of fatty alcohol polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to obtain the salt inhibition foam discharging agent.
Example 2
S1, uniformly mixing 37 parts of sulfonated AEO3 and 14 parts of OP-10, reacting for 3.1 hours 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 p-styrenesulfonate (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 ethylene glycol, reacting for 4.2 hours at 72 ℃ for full reaction, then adding 4.5 parts of fatty alcohol polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to obtain the salt inhibition 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 p-styrenesulfonate (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 ethylene glycol, reacting for 4 hours at 70 ℃ for full reaction, adding 4 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to obtain the salt inhibition 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 p-styrenesulfonate (SSS) binary polymer, and cooling to room temperature to prepare a salt inhibitor;
s2, uniformly mixing the foaming agent, the salt inhibitor and 7 parts of ethylene glycol, reacting for 4 hours at 70 ℃ for full reaction, adding 3 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to obtain the salt inhibition foam discharging agent.
Noteworthy are: the preparation method of the binary polymer of Maleic Anhydride (MA)/sodium p-styrene sulfonate (SSS) in the above examples 1-4 is the prior art, namely, the binary polymer is prepared by polymerizing Maleic Anhydride (MA) and sodium p-styrene sulfonate (SSS) serving as raw materials, ammonium persulfate serving as an initiator and sodium hypophosphite serving as a 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 with 8 parts of Maleic Anhydride (MA)/sodium p-styrenesulfonate (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 ethylene glycol, reacting for 4.5 hours at 68 ℃ for full reaction, adding 3 parts of fatty alcohol polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to obtain the salt inhibition foam discharging agent.
Comparative example 2
S1, uniformly mixing 15 parts of sulfonated AEO3 and 20 parts of OP-10, reacting for 2.8 hours at 66 ℃, cooling to room temperature, adding 3 parts of fatty alcohol polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to prepare the foam discharging agent.
Comparative example 3
Conventional foam discharging agent
Experimental example 1 foaming ability and foam stability test (measurement by Roche foam apparatus)
2.0g of the foam discharging agent in examples 1-4 and comparative examples 1-3 are weighed respectively in a 1000mL beaker, mineralized water sample is added for dilution to 400mL, to obtain a sample liquid to be tested, the concentration of the foam discharging agent is 5.0 per mill, and the sample liquid to be tested is placed in a constant temperature water bath and heated to 70+/-1 ℃ for standby.
The constant temperature water bath preheats the Roche foam instrument and is kept at the constant temperature of 70+/-1 ℃, a 200mL pipette is used for transferring 50mL of sample liquid to be tested to put down a flushing pipe wall along the pipe wall of the Roche foam instrument, a valve at the lower end of the Roche foam instrument is closed after the flushing liquid is flowed, then 50mL of sample liquid to be tested is transferred to put down along the pipe wall of the Roche foam instrument, a liquid level is formed at the bottom, a 200mL of sample liquid to be tested is transferred to be placed at the center of the upper end of the Roche foam instrument by using the pipette, the liquid level is aligned to be vertically put down, and the rising height of foam in the Roche foam instrument is immediately recorded after the sample liquid is put down, so that the foaming capacity of the experimental sample is obtained. The foam height after 5min was recorded, which is the foam stabilizing ability of the test sample, and the test 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 discharging agent (foam discharging agent in examples 1-4) in the invention has little influence on foaming force and foam stabilizing force under the condition that the mineralization degree is 200-350 g/L; comparative example 1 was not prepared exactly according to the amount in the present invention, and its foaming and foam stabilizing ability was markedly insufficient, and as the degree of mineralization increased, the foaming and foam stabilizing ability was drastically decreased; the foam discharging agent in comparative example 2 has almost the same foaming capacity as the present invention at a mineralization degree of 200g/L, however, the foam stabilizing and foaming properties are significantly reduced with increasing mineralization degree; the conventional foam discharging agent in comparative example 3 has a rapid decrease in foaming and foam stabilizing power with an increase in mineralization under high mineralization conditions, and in particular, has almost lost foaming and foam stabilizing ability after the mineralization is higher than 300 g/L. From this, it is clear that the foam discharging agent of the present invention can exert remarkable foaming and foam stabilizing properties under the condition of high mineral content.
Experimental example 2 liquid carrying Rate test
2.0g of the foam discharging agent in examples 1-4 and comparative examples 1-3 is weighed into a beaker respectively, mineralized water sample is added to dilute to 400mL, to-be-detected sample liquid with the foam discharging agent concentration of 5.0 per mill is obtained, and the to-be-detected sample liquid is placed into a constant-temperature water bath and heated to 70+/-1 ℃ for standby.
The constant-temperature water bath preheats the liquid carrying instrument and keeps the temperature at 70+/-1 ℃, an inflator pump is opened, 8L of gas is filled in each minute, the preheated sample liquid to be tested is poured into the constant-temperature liquid carrying instrument, the solution is foamed, the liquid carried out is collected by a liquid collector until no foam is carried out, and the volume of the carried liquid (carrying rate=carrying liquid volume/total volume of the sample liquid multiplied by 100%) is measured, so that the liquid carrying capacity of the experimental sample is obtained. The experimental results are shown in table 2.
Table 2: liquid carrying rate test results
As can be seen from table 2: the liquid carrying rate of the foam discharging agent (foam discharging agent in examples 1-4) in the invention is hardly affected under the condition that the mineralization degree is 200-350 g/L; comparative example 1 was not prepared exactly according to the amounts used in the present invention, and its liquid carrying rate was low; the foam discharging agent in comparative example 2 has almost the same liquid carrying capacity as the present invention when the mineralization degree is 200g/L, but has obviously reduced liquid carrying capacity with the increase of the mineralization degree; under the condition of high mineralization, the conventional foam discharging agent in the comparative example 3 has the advantages that the liquid carrying rate is sharply reduced along with the increase of the mineralization, and particularly, the liquid carrying capacity is obviously insufficient after the mineralization is higher than 300 g/L. Therefore, the foam discharging agent can play a remarkable role in carrying liquid under the condition of high mineral concentration.
Experimental example 3 salt inhibition test
Preparing supersaturated sodium chloride solution: measuring 500mL of distilled water in a beaker, heating to 90 ℃, adding sodium chloride until the distilled water is in a supersaturated state, and placing the mixture in a constant-temperature water bath at 90 ℃ for later use;
100mL of supersaturated sodium chloride solution was measured separately in 9 beakers, numbered 1 through 9. Wherein, 0.5g of the foam discharging agent in the examples 1-4 and the comparative examples 1-3 are respectively added into a No. 1-8 beaker, and uniformly stirred, no foam discharging agent is added into a No. 9 beaker, and after uniformly stirred, the mixture is naturally cooled to room temperature, and the salting-out phenomenon is observed; in addition, the cooled liquid sample is filtered, dried and weighed.
Salt inhibition rate = (salt formation without agent-salt formation with agent)/salt formation without agent x 100%
The test results are shown in Table 3.
Table 3: salt inhibition test results
The table 3 shows that the foam discharging agent has extremely strong salt inhibition capability, so that the salting-out and salt blocking phenomenon in a high-mineralization mine can be effectively solved, and the foaming and foaming capabilities of the foam discharging agent can be ensured to be continuous and stable.
Further, graphs of salt inhibition effects in beaker nos. 3, 7 and 8 are shown in fig. 1, respectively, wherein No. 3 is shown in fig. 1a, no. 7 is shown in fig. 1b, and No. 8 is shown in fig. 1 c.
Experimental example 4 YH-X well application Effect
YH-X well is located in Fen Yonghe county, shanxi province, and the construction position is the east edge of the Erdos basin. The well is drilled in the period of 24 days of 2016, 9, 10 months and 1 day, the drilling is completed, the drilling hanging depth is 2990.00, the inclined depth is 4210.00 (B target point) m, and five layers of the horizon horse are completed.
The well has extremely high mineralization degree of stratum water, more than 300g/L, and a large amount of salt substances are precipitated in a shaft and a near-well zone due to the change of temperature and pressure in the production process, so that an airflow channel is often blocked (as shown in figure 2), and water mixing and salt removal construction is adopted once in 3 months on average.
Statistics of production data of 2021, 5 months, 11 days-17 days, wherein the average oil pressure produced by the well is 1.43MPa, the casing pressure is 5.69MPa, and the daily average gas yield is 3252m 3 The production of the well is unstable and can not carry liquid independently, the pressure-reducing liquid is required to be frequently adopted, especially for 16-17 days in 5 months, and the gas production of the well is lower than 1000m 3 And/d. The well bore is seriously accumulated in water flooded state.
The well was first filled with salt-suppressing foam-draining agent (injection: the salt-suppressing foam-draining agents described in Experimental example 4 are foam-draining agents in example 1) at 18 months 5 of 2021, and the filling concentration was suitably increased in consideration of serious wellbore dropsy in a flooded stateAt the same time, salt-suppressing foam discharging agent 45L (foam discharging: water=1:3) is filled from the wellhead oil pipe, depressurization and fluid carrying are matched in the station, the accumulated fluid in the shaft is forcedly discharged, the normal production of the gas well is recovered in the same day, and the produced gas is 4603m 3 Producing liquid 8.54m 3 。
From day 5 to day 18 to day 20, salt suppression foam discharging agent 45L (foam discharging: water=1:3) is injected from wellhead oil for 3 consecutive days, after the first stage foam discharging is implemented, gas well production is obviously improved, and gas production is integrated for 16243m three days 3 Accumulated liquid yield 30.04m 3 。
Every day, the automatic wellhead filling device is used for sleeving and filling salt-suppressing foam discharging agent 40L (foam discharging: water=1:3) for every day, 21 days-6 months and 15 days, the production of a gas well is stable, and the daily average gas production is 6232m 3 Daily average production liquid 10.90m 3 。
The experimental effect of experimental example 4 is shown in fig. 3.
In addition, the conventional foam discharging agent was also compared with the foam discharging 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 to 6 months by adding the salt inhibition foam discharging agent, and the phenomenon of blocking a pipeline by salt formation does not occur.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein and is not to be considered as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either by the foregoing teachings or by the teaching of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (8)
1. The salt-inhibiting foam discharging agent for the exploitation of the hypersalinity 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 OP10. 10-20 parts of Maleic Anhydride (MA)/sodium p-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 discharging agent for high salinity natural gas well opening according to claim 1, which is characterized by comprising the following components in parts by weight:
33-38 parts of sulfonated AEO 3 14-19 parts of OP-10, 12-17 parts of Maleic Anhydride (MA)/sodium p-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 rejection foam discharging agent for high salinity natural gas well opening according to claim 1, which is characterized by comprising the following components in parts by weight:
36 parts of sulfonated AEO 3 17 parts of OP-10, 15 parts of Maleic Anhydride (MA)/sodium p-styrene sulfonate (SSS) binary polymer, 6.5 parts of polyaspartic acid, 8 parts of ethylene glycol and 4 parts of sodium fatty alcohol polyoxyethylene ether sulfate.
4. A method for preparing a salt rejection foam discharging agent for the exploitation of high salinity natural gas wells according to any one of claims 1-3, comprising the steps of:
s1 sulphonated AEO 3 Uniformly mixing with OP-10, fully reacting, and cooling to room temperature to obtain a foaming agent; uniformly mixing polyaspartic acid and Maleic Anhydride (MA)/sodium p-styrenesulfonate (SSS) binary polymer, and cooling to room temperature to obtain a salt inhibitor;
s2, uniformly mixing the foaming agent, the salt inhibitor and the ethylene glycol, fully reacting, then adding the fatty alcohol-polyoxyethylene ether sodium sulfate, uniformly mixing, and cooling to room temperature to obtain the salt-inhibiting foam discharging agent.
5. The method for preparing salt rejection foam discharging agent for high salinity natural gas well opening according to claim 4, wherein the S1In (C), sulfonated AEO 3 The reaction temperature with OP-10 is 55-66 ℃, and the reaction time is 2.8-3.2h.
6. The method for producing a salt rejection foam discharging agent for high salinity gas well opening according to claim 5, wherein in S1, sulfonated AEO 3 The reaction temperature with OP-10 is 60 ℃ and the reaction time is 3h.
7. The method for preparing salt rejection foam discharging agent for high salinity natural gas well opening according to claim 4, wherein in the step S2, 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 salt rejection foam discharging agent for high salinity natural gas well opening according to claim 7, wherein in S2, the reaction temperature of the foaming agent, the salt rejection agent and ethylene glycol is 70 ℃ and the reaction time is 4h.
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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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