CN104498013A - Self-foaming-type foaming drainage agent and preparation method thereof - Google Patents
Self-foaming-type foaming drainage agent and preparation method thereof Download PDFInfo
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- CN104498013A CN104498013A CN201410479075.2A CN201410479075A CN104498013A CN 104498013 A CN104498013 A CN 104498013A CN 201410479075 A CN201410479075 A CN 201410479075A CN 104498013 A CN104498013 A CN 104498013A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
Abstract
The invention discloses a self-foaming-type foaming drainage agent. The self-foaming-type foaming drainage agent comprises, by weight, 20-40 parts of soapberry fruit saponin, 8-25 parts of sodium fatty acid methyl ester sulfonate, 8-25 parts of 1-hydroxyethylidene-1,1-diphosphonicacid, 10-30 parts of sodium bicarbonate and 10-30 parts of tartrate. The preparation method comprises the following steps of S1, weighing: weighing the raw materials according to the above ratio for next use, S2, drying: drying the weighed raw materials so that water content is less than 3%, and S3, pressing: adding all the dried raw materials into a mixer, carrying out stirring for 4-8min, transferring the mixture into a hydraulic press and carrying out processing to obtain round rod-shaped solids which are the self-foaming-type foaming drainage agents. The self-foaming-type foaming drainage agent realizes natural gas well foaming drainage of a water-blocked gas well or a natural gas well with a weak stratum capability, has dual effects of gaslifting and a foaming drainage agent, has a strong self-foaming capacity and a high liquid carrying rate and can produce effects fast. The preparation method has simple and convenient processes, has a low production cost, is environmentally friendly and is suitable for industrial large-scale production.
Description
Technical field
The invention belongs to technical field of oilfield chemistry, be specifically related to bring back to life one used in technique from foaming type foaming water discharge agent and preparation method thereof for watered gas well foaming water discharge.
Background technology
Gasser is in the middle and later periods of exploitation, and because gas well self-energy declines, local water also enters pit shaft with Sweet natural gas, build up in shaft bottom or immediate vicinity of wellbore, the gas production rate of gas well is caused to decline and along with local water is in the increase of pit shaft, gas well is dead by water logging after exploitation for some time, cannot exploit.
At present, in order to solve the problem that gas well is produced because of local water impact, the method for employing is filling whipping agent, or drops into foaming rod or foamed ball by oil pipe, by shaft bottom hydrops foamed thus utilize lower gas discharge just hydrops can be got rid of, prevent gas well by water logging.But along with the decline of gas well self-energy, gas flow rate does not reach lifting foam ability, gas well cannot normal drainage, and the old well of part is drowned by local water.For the old well of being drowned by local water, current each gas field adopts " gaslift+foam discharging agent " recombining process to carry out gas well and reproduces.And gaslift technique injects high pressure gas with special gaslift car to oil, cover annular space or use Sweet natural gas injection oil, the cover annular space of contiguous high-pressure gas well, the local water in pit shaft is enumerated ground.But adopt gaslift car or use high-pressure gas well natural gas, bring back to life that taking of a bite well is all higher, the time is long, at least several ten thousand, hundreds of thousands of at most.And by the gas well after bringing back to life after production for some time, as discharged pit shaft hydrops not in time, be easy to be drowned.Therefore, be badly in need of exploitation one have " gaslift+foam discharging agent " double effects from foaming type foaming water discharge agent.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, there is provided a kind of from foaming type foaming water discharge agent, watered gas well should be solved or ability more weak gasser foam drainage gas recovery technique in stratum needs from foaming type foaming water discharge agent, there is " gaslift+foam discharging agent " double effects, self foam performance is strong, take that liquid rate is high, instant effect;
Another object of the present invention is to provide a kind of preparation method from foaming type foaming water discharge agent, the method is simple to operate, easy to prepare, production cost is low, environmental protection, is applicable to batch production scale operation.
Object of the present invention is achieved through the following technical solutions: a kind of from foaming type foaming water discharge agent, it is made up of the raw material of following weight parts:
Sapindoside: 20 ~ 40; Methyl sodiosul foaliphatate: 8 ~ 25;
Hydroxy ethylene diphosphonic acid: 8 ~ 25; Sodium bicarbonate: 10 ~ 30;
Tartrate: 10 ~ 30.
Further, it is made up of the raw material of following weight parts:
Sapindoside: 25 ~ 35; Methyl sodiosul foaliphatate: 10 ~ 20;
Hydroxy ethylene diphosphonic acid: 10 ~ 20; Sodium bicarbonate: 18 ~ 25;
Tartrate: 18 ~ 23.
As preferably, it is made up of the raw material of following weight parts:
Sapindoside: 30; Methyl sodiosul foaliphatate: 15;
Hydroxy ethylene diphosphonic acid: 15; Sodium bicarbonate: 20;
Tartrate: 20.
The above-mentioned preparation method from foaming type foaming water discharge agent, it comprises the following steps:
S1. weigh: take each raw material by said ratio, for subsequent use;
S2. dry: load weighted each raw material is dried to water content <3% at 100 ~ 110 DEG C of temperature;
S3. suppress: dried each raw material is added in mixer, proceed to hydropress after stirring 4 ~ 8min and be pressed into round stick solid, namely obtained from foaming type foaming water discharge agent.
The present invention has the following advantages:
(1) of the present invention from foaming type foaming water discharge agent after adding pit shaft, after product is water-soluble, sodium bicarbonate and tartaric acid constituent decompose, and produce a large amount of gas; Sapindoside reduces the surface tension of local water, and local water is more easily bubbled.Under both effects, the gas of generation stirs the local water in pit shaft on the one hand, makes local water in the foaming of pit shaft inner height, reduces local water density in the wellbore.On the other hand a large amount of resistance aqueous foam is given rise to ground, to reduce in pit shaft local water to the pressure of payzone, allow the Sweet natural gas in payzone enter pit shaft smoothly, promote local water, make local water take pit shaft out of endlessly.Thus realize " gaslift+foam " double effects; And strong from self foam performance of foaming type foaming water discharge agent, take that liquid rate is high, instant effect;
(2) cost adopting the present invention to bring back to life gas well from foaming type foaming water discharge agent is low, a bite well is brought back to life at about 1000 yuan according to statistics, and adopt the gas well after foaming type foaming water discharge agent brings back to life, only need regularly to press foaming water discharge agent system, supplementing a small amount of (about 0.5%) foaming water discharge agent can prevent gas well again dead by water logging, realizes gas well continuous seepage.
(3) the present invention is simple to operate, easy to prepare from the preparation method of foaming type foaming water discharge agent, production cost is low, environmental protection, is applicable to batch production scale operation.
Accompanying drawing explanation
Fig. 1 is ring shallow X well effect of field application figure;
Fig. 2 is that Soviet Union and Eastern Europe's X well reproduces front and back productive frontiers figure.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described, and protection scope of the present invention is not limited to the following stated.
Embodiment 1: a kind of from foaming type foaming water discharge agent, it is made up of the raw material of following weight parts: sapindoside: 20; Methyl sodiosul foaliphatate: 8; Hydroxy ethylene diphosphonic acid: 8; Sodium bicarbonate: 10; Tartrate: 10.
The above-mentioned preparation method from foaming type foaming water discharge agent, it comprises the following steps:
S1. weigh: take each raw material by said ratio, for subsequent use;
S2. dry: it is 2% that load weighted each raw material is dried to water content at 100 DEG C of temperature;
S3. suppress: dried each raw material is added in mixer, proceed to hydropress after stirring 4min and be pressed into round stick solid, namely obtained from foaming type foaming water discharge agent.
Embodiment 2: a kind of from foaming type foaming water discharge agent, it is made up of the raw material of following weight parts: sapindoside: 40; Methyl sodiosul foaliphatate: 25; Hydroxy ethylene diphosphonic acid: 25; Sodium bicarbonate: 30; Tartrate: 30.
The above-mentioned preparation method from foaming type foaming water discharge agent, it comprises the following steps:
S1. weigh: take each raw material by said ratio, for subsequent use;
S2. dry: it is 1.3% that load weighted each raw material is dried to water content at 110 DEG C of temperature;
S3. suppress: dried each raw material is added in mixer, proceed to hydropress after stirring 8min and be pressed into round stick solid, namely obtained from foaming type foaming water discharge agent.
Embodiment 3: a kind of from foaming type foaming water discharge agent, it is made up of the raw material of following weight parts: sapindoside: 25; Methyl sodiosul foaliphatate: 10; Hydroxy ethylene diphosphonic acid: 10; Sodium bicarbonate: 18; Tartrate: 18.
The above-mentioned preparation method from foaming type foaming water discharge agent, it comprises the following steps:
S1. weigh: take each raw material by said ratio, for subsequent use;
S2. dry: it is 2.8% that load weighted each raw material is dried to water content at 102 DEG C of temperature;
S3. suppress: dried each raw material is added in mixer, proceed to hydropress after stirring 5min and be pressed into round stick solid, namely obtained from foaming type foaming water discharge agent.
Embodiment 4: a kind of from foaming type foaming water discharge agent, it is made up of the raw material of following weight parts: sapindoside: 35; Methyl sodiosul foaliphatate: 20; Hydroxy ethylene diphosphonic acid: 20; Sodium bicarbonate: 25; Tartrate: 18 ~ 23.
The above-mentioned preparation method from foaming type foaming water discharge agent, it comprises the following steps:
S1. weigh: take each raw material by said ratio, for subsequent use;
S2. dry: it is 2.3% that load weighted each raw material is dried to water content at 105 DEG C of temperature;
S3. suppress: dried each raw material is added in mixer, proceed to hydropress after stirring 6min and be pressed into round stick solid, namely obtained from foaming type foaming water discharge agent.
Embodiment 5: a kind of from foaming type foaming water discharge agent, it is made up of the raw material of following weight parts: sapindoside: 30; Methyl sodiosul foaliphatate: 15; Hydroxy ethylene diphosphonic acid: 15; Sodium bicarbonate: 20; Tartrate: 20.
The above-mentioned preparation method from foaming type foaming water discharge agent, it comprises the following steps:
S1. weigh: take each raw material by said ratio, for subsequent use;
S2. dry: it is 2% that load weighted each raw material is dried to water content at 108 DEG C of temperature;
S3. suppress: dried each raw material is added in mixer, proceed to hydropress after stirring 7min and be pressed into round stick solid, namely obtained from foaming type foaming water discharge agent.
Below by way of description of test beneficial effect of the present invention:
One, performance comparison test
(1) tested object: experimental group is embodiment 1-5, control group is UT-4 oil-gas field solid foam water discharge agent (production firm: Chengdu Fuji Science and Technology Co., Ltd.)
(2) test index: foam performance, take liquid rate;
(3) testing method:
A. foam performance: internal diameter be 100mm, highly for 1500mm cylindrical glass pipe (bottom seal) in, add 90 DEG C of tap water of 200ml, then add a certain amount of from bubbled foam water discharge agent, after observing 2min in a stationary situation, the height of foam in glass, is foaming water discharge agent self foaming power.
B. liquid rate is taken: take liquid rate by the method testing period specified in SY/T5761-1995 standard.
(4) test result: as shown in table 1, table 2:
Table 1: traditional foam discharging agent with from foaming type foaming water discharge agent foam performance test result
Table 2: traditional foam discharging agent with take liquid rate test result from foaming type foaming water discharge agent
From table 1, table 2, conventional foam water discharge agent without foam performance, to take liquid rate be 0%, and of the present invention from foaming type foaming water discharge agent have self foam performance strong, take the high performance of liquid rate.
Two, effect of field application experiment
1. ring shallow X well effect
(1) experimental subjects: the shallow X well of ring is Chongqing City's gas mine, abnormal conditions: when on April 1st, 2014 produced to by this well, and oil, the cover pressure reduction of gas well obviously increase, and casing pressure increases to 2MPa, and water production rate is by original 0.2m
3/ d drops to 0m
3/ d, gas producing well amount also drops to 0.7 × 10
4m
3/ d.Analysis major cause is, in the pit shaft of this well, hydrops is more, and a large amount of hydrops, entering pit shaft and forming the fluid column of certain altitude, causes obstruction to Sweet natural gas.
(2) experimental period: on April 26,1 day to 2014 April in 2014;
(3) experimental technique: add of the present invention from foaming type foaming water discharge agent 5kg on April 12nd, 2014;
(4) experimental result: as shown in Fig. 1 and table 3
Table 3: the shallow X well of ring reproduces front and back contrast table
From table 1 and Fig. 1: of the present invention from foaming type foaming water discharge agent through adding, the oil pressure of this well, water production rate, gas production rate obtain significant raising.
2. Soviet Union and Eastern Europe X well effect
(1) experimental subjects: the shallow X well of ring, is positioned at Wushen Banner, the Inner Mongol, Soviet Union's Sulige gas field, abnormal conditions: when this well was produced in May, 2014, the hydrops in pit shaft cannot be discharged due to gas well self, when producing May 28, gas well " is drowned " by local water, and daily output tolerance is by 3000m
3to 0m under/d
3/ d, and drive a well.Analyzing its reason is: well oil pressure is lower only has 2MPa for this, gas well stratum permeability is also poor, the hydrops entered in pit shaft is not discharged in time, be deposited in pit shaft, along with the prolongation of time, hydrops in pit shaft gets more and more, and the pressure of last pit shaft fluid column has been greater than the impellent of storage gas, has sealed storage gas.
(2) experimental period: on July 3,1 day to 2014 June in 2014;
(3) experimental technique: it is of the present invention from foaming type foaming water discharge agent that the measure of reproducing is that well head divides three times (once a day) to add, and adds 15 (12kg) at every turn and carry out reproducing measure.Within continuous three days under this system, take to reproduce measure.Within continuous three days under this system, take to reproduce measure.Reproduce successfully, consider that gas well self-energy is more weak, need to carry out filling liquid bubble row subband liquid, so 5kg/ (filling in every two days once) filling liquid foam discharging agent stably manufactured regularly pressed by this well.
(4) experimental result: as shown in Fig. 2 and table 4
Table 4: Soviet Union and Eastern Europe's X well reproduces front and back contrast table
From table 4 and Fig. 2: after within continuous three days, taking to reproduce measure, gas well momentary output is by 20m
3/ h rises to 400m
3/ h.Order gas production rate reaches 9600m
3/ d, illustrates that gas well reproduces successfully.
3. Chongqing City's well
(1) abnormal conditions: this well pressure warning unit on June 22nd, 2009 is down to well depth 2831.00m measured projection to middle part well depth 3520.00mm, and bottom pressure 14.825MPa, actual measurement level 1937.00m, well head oil pressure is 1.0MPa, and daily gas is 0.1 × 10
4m
3/ d, produces very difficult, and by repeatedly open flow extract, oil jacket declines simultaneously and rapidly, and down-hole hydrops is more simultaneously, has a strong impact on production.
(2) take measures: add of the present invention from foaming type foaming water discharge agent 1.5kg to this well oil pipe in first time on December 2nd, 2009, on December 17th, 2009, second time added of the present invention from foaming type foaming water discharge agent 6kg to oil pipe, on 01 14th, 2010 third times, type oil pipe added of the present invention from foaming type foaming water discharge agent 2.5kg, and 10kg is from foaming type foaming water discharge agent altogether.
(3) effect:
A. the casing pressure that produces oil rises to casing pressure 8.10MPa, oil pressure 8.10MPa from oil pressure 0.64MPa, casing pressure 0.66MPa respectively;
B. tolerance is produced daily by 0.1 × 10
4m
3/ d rises to 0.6 × 10
4m
3/ d, increase day by day gas production rate 0.5 × 10
4m
3/ d;
C. accumulative discharge opeing 30m after caber
3.
4. thought's well
(1) abnormal conditions: this well location is domestic in thought, structure is positioned at that sandalwood place is fast, Liu family's height of dam point section axle portion, south wing to the west, and this well spudded on November 18th, 2009, and finishing drilling layer is the Carboniferous system, went into operation on September 16th, 2010.This well goes into operation rear gas production rate from 16.9 × 10 of September 17
4m
3/ d is down to rapidly 6.1 × 10 of September 21
4m
3/ d, weather gas production rate maintains 6 × 10
4m
3about/d produced to October 10.Gas well produces water rapidly after going into operation, and water sampling did total analysis and was bottom water September 20.This well was from 10 days October in 2010, and gas production rate occurs downtrending again, produces tolerance daily be down to 2.2 × 10 to October 18
4m
3/ d, underground throttle device takes out by October 19, but this well condition of production worsens further, produces tolerance daily reduce to zero to October 21.After being pressed again by closing well, gas well imports production just without output after one day, and being forced to can only batch production.Because gas well water production rate is comparatively large, take the mode of emptying extract that shaft bottom can only be made to be worse off, so working district is pressed again to this well closing well.
(2) take measures: on November 3rd, 2010 carries out bubble row filling experiment to this well, every day sooner or later twice of the present invention from foaming type foaming water discharge agent 48 (33.5kg) to gas well.
(3) effect: gas well drives a well at every turn can continuous seepage 4 to 5 days, and gas production rate increases to 4.8 × 10
4m
3/ d, Be very effective.
5. Dianjiang County, Chongqing City well
(1) abnormal conditions: this well foam discharging agent of annotating before 7 days Mays in 2011 is: once, each filling 4 kilograms is 1:20 with the Dilution ratio of water to every three days filling foam discharging agents, point twice respectively filling 2 kilograms sooner or later; UT-4 solid foam discharging agent 9 is thrown in oil pipe when closing well is pressed again.After gas well is pressed again by closing well before, open flow extract, gas well can maintain production reluctantly, can continuous band liquid, and the later stage stops filling foam discharging agent.This well produces 2011 at the beginning, and gas well embodies just to produce is with liquid discontinuous, and along with the prolongation oil jacket pressure of production time progressively increases, the condition of production is unstable.
(2) take measures: May 7 in 2011, day entry produced casing pressure 4.80MPa, production oil pressure 1.34MPa, daily output tolerance 0.5757 × 10 day before yesterday
4m
3/ d, gas production rate 0.1m
3; Because the hydrops in pit shaft is not taken out of by the conventional bubble rod row of long-term filling before, oil jacket pressure reduction is progressively increasing, and considers that the hydrops of pit shaft can not be taken out of by the gas production rate by gas well is current.Of the present invention after foaming type foaming water discharge agent by repeatedly adding to oil pipe, pit shaft hydrops is thoroughly taken out of; Day entry was produced casing pressure 3.70MPa, was produced oil pressure 1.42MPa gas well gas production rate 1.0 × 10 May 11 in 2011
4m
3/ d, water production rate 0.2m
3.According to gas well liquid loading situation, preliminary formulate of the present invention from foaming type foaming water discharge agent 5kg/ time.
(3) effect:
A. the cover pressure reduction that produces oil drops to 2.28MPa from 3.36MPa, reduces oil jacket pressure reduction 1.1MPa;
B. tolerance is produced daily by 0.57 × 10
4m
3/ d rises to 1.0 × 10
4m
3/ d, increase day by day gas production rate 0.43 × 10
4m
3/ d;
C. water yield per day is from 0.1m
3/ d rises to 0.2m
3/ d.
Claims (4)
1. from a foaming type foaming water discharge agent, it is characterized in that, it is made up of the raw material of following weight parts:
Sapindoside: 20 ~ 40; Methyl sodiosul foaliphatate: 8 ~ 25;
Hydroxy ethylene diphosphonic acid: 8 ~ 25; Sodium bicarbonate: 10 ~ 30;
Tartrate: 10 ~ 30.
2. as claimed in claim 1 a kind of from foaming type foaming water discharge agent, it is characterized in that, it is made up of the raw material of following weight parts:
Sapindoside: 25 ~ 35; Methyl sodiosul foaliphatate: 10 ~ 20;
Hydroxy ethylene diphosphonic acid: 10 ~ 20; Sodium bicarbonate: 18 ~ 25;
Tartrate: 18 ~ 23.
3. as claimed in claim 1 a kind of from foaming type foaming water discharge agent, it is characterized in that, it is made up of the raw material of following weight parts:
Sapindoside: 30; Methyl sodiosul foaliphatate: 15;
Hydroxy ethylene diphosphonic acid: 15; Sodium bicarbonate: 20;
Tartrate: 20.
4., as the preparation method from foaming type foaming water discharge agent in claim 1-3 as described in any one, it is characterized in that, it comprises the following steps:
S1. weigh: take each raw material by said ratio, for subsequent use;
S2. dry: load weighted each raw material is dried to water content <3% at 100 ~ 110 DEG C of temperature;
S3. suppress: dried each raw material is added in mixer, proceed to hydropress after stirring 4 ~ 8min and be pressed into round stick solid, namely obtained from foaming type foaming water discharge agent.
Priority Applications (1)
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|---|---|---|---|
| CN201410479075.2A CN104498013B (en) | 2014-09-18 | 2014-09-18 | It is a kind of from foaming type foaming water discharge agent and preparation method thereof |
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|---|---|---|---|
| CN201410479075.2A CN104498013B (en) | 2014-09-18 | 2014-09-18 | It is a kind of from foaming type foaming water discharge agent and preparation method thereof |
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| CN104498013B CN104498013B (en) | 2017-10-24 |
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| CN106497533A (en) * | 2016-08-30 | 2017-03-15 | 西咸新区海创化工科技有限公司 | A kind of damp-proof foam drainage rod and preparation method thereof |
| CN106978155A (en) * | 2017-03-19 | 2017-07-25 | 西南石油大学 | A kind of disturbance capsule shape solid foam discharging agent certainly |
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| CN114427431A (en) * | 2020-09-08 | 2022-05-03 | 中国石油化工股份有限公司 | Liquid-carrying critical flow control method for low-pressure low-yield gas well |
| CN112111259A (en) * | 2020-09-09 | 2020-12-22 | 长江大学 | Nonionic-anionic composite surfactant and preparation method and application thereof |
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| CN112877052A (en) * | 2021-02-08 | 2021-06-01 | 四川圣诺油气工程技术服务有限公司 | Preparation method of sinking type liquid delay foaming agent for gas production foam drainage and sand carrying |
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| CN112961659B (en) * | 2021-02-08 | 2022-07-12 | 四川圣诺油气工程技术服务有限公司 | Sinking type liquid delay foaming agent for gas production foam drainage and sand carrying |
| CN112877052B (en) * | 2021-02-08 | 2022-07-22 | 四川圣诺油气工程技术服务有限公司 | Preparation method of sinking type liquid delay foaming agent for gas production foam drainage and sand carrying |
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