CN111073619A - Foam discharging agent for gas field - Google Patents
Foam discharging agent for gas field Download PDFInfo
- Publication number
- CN111073619A CN111073619A CN201911381320.5A CN201911381320A CN111073619A CN 111073619 A CN111073619 A CN 111073619A CN 201911381320 A CN201911381320 A CN 201911381320A CN 111073619 A CN111073619 A CN 111073619A
- Authority
- CN
- China
- Prior art keywords
- agent
- foam discharging
- discharging agent
- foam
- emulsion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007599 discharging Methods 0.000 title claims abstract description 126
- 239000006260 foam Substances 0.000 title claims abstract description 107
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 122
- 239000000463 material Substances 0.000 claims abstract description 108
- 238000005187 foaming Methods 0.000 claims abstract description 57
- 239000011248 coating agent Substances 0.000 claims abstract description 54
- 238000000576 coating method Methods 0.000 claims abstract description 54
- 239000008259 solid foam Substances 0.000 claims abstract description 48
- 239000008258 liquid foam Substances 0.000 claims abstract description 11
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 102
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 102
- 239000000839 emulsion Substances 0.000 claims description 82
- 239000004088 foaming agent Substances 0.000 claims description 39
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 30
- 239000011118 polyvinyl acetate Substances 0.000 claims description 30
- 239000003381 stabilizer Substances 0.000 claims description 18
- 150000001875 compounds Chemical class 0.000 claims description 17
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 12
- 229920000570 polyether Polymers 0.000 claims description 11
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 9
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 3
- -1 alcohol sulfate salts Chemical class 0.000 claims description 2
- XGZOMURMPLSSKQ-UHFFFAOYSA-N n,n-bis(2-hydroxyethyl)octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)N(CCO)CCO XGZOMURMPLSSKQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000008117 stearic acid Substances 0.000 claims description 2
- 238000013022 venting Methods 0.000 claims 8
- NJVOHKFLBKQLIZ-UHFFFAOYSA-N (2-ethenylphenyl) prop-2-enoate Chemical compound C=CC(=O)OC1=CC=CC=C1C=C NJVOHKFLBKQLIZ-UHFFFAOYSA-N 0.000 claims 2
- IBOFVQJTBBUKMU-UHFFFAOYSA-N 4,4'-methylene-bis-(2-chloroaniline) Chemical compound C1=C(Cl)C(N)=CC=C1CC1=CC=C(N)C(Cl)=C1 IBOFVQJTBBUKMU-UHFFFAOYSA-N 0.000 claims 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 20
- 239000007788 liquid Substances 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 11
- 238000003756 stirring Methods 0.000 abstract description 9
- 239000002518 antifoaming agent Substances 0.000 description 20
- 239000007789 gas Substances 0.000 description 19
- 238000004090 dissolution Methods 0.000 description 16
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 6
- 230000005484 gravity Effects 0.000 description 6
- OTGQIQQTPXJQRG-UHFFFAOYSA-N N-(octadecanoyl)ethanolamine Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCO OTGQIQQTPXJQRG-UHFFFAOYSA-N 0.000 description 5
- 229910000027 potassium carbonate Inorganic materials 0.000 description 5
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000004985 diamines Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002343 natural gas well Substances 0.000 description 2
- 238000010186 staining Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention belongs to the technical field of gas production well foam discharging, and relates to a foam discharging agent for a gas field, which comprises a solid foam discharging agent and an outer shell wrapped outside the solid foam discharging agent; the solid foam discharging agent and the outer shell are both spheroids or spheroids with hollow interiors; the outer shell is made of a slow-dissolving coating material; the solid foam discharging agent is a solid foam discharging agent made of foaming materials; the mass ratio of the foaming material to the coating material is 6: 1-6: 5; a cavity is arranged between the solid foam discharging agent and the outer shell, and the liquid foam discharging agent is filled in the cavity; also included is a connecting tube disposed between the outer housing and the cavity. The foam discharging agent disclosed by the invention is not easy to stick to the wall, has a density higher than that of water, is long in time consumption in the dissolving process, can fall on the bottom of a well by virtue of the self weight and fully contact with accumulated liquid, generates airflow and stirs at the bottom of the well, and improves the foam discharging effect.
Description
Technical Field
The invention belongs to the technical field of gas production well foam removal, and relates to a foam removal agent for a gas field.
Background
The natural gas production well can be divided into a vertical well, a horizontal well, a branch well and the like according to the application, the natural gas well, particularly the natural gas well in the middle and later production periods, has reduced formation pressure, reduced gas yield and reduced carrying capacity, and part of formation water entering a shaft can be retained at the bottom of the well and generate accumulated liquid; the liquid column pressure of the accumulated liquid and the formation pressure may reach static balance, so that the production condition is deteriorated, the yield is reduced, even the production is stopped due to flooding, and therefore, the accumulated liquid must be discharged in time by adopting a water and gas drainage process technology.
The main drainage measures at the present stage of the gas field comprise foam drainage, plunger drainage, inter-well interconnected annular gas lift drainage technology, high-pressure nitrogen gas lift, small-diameter pipe foam drainage, foam drainage and other process combination and the like; the foam discharging process principle is that a large amount of low-density water-containing foam is generated in a shaft by utilizing the foam effect, the dispersion effect, the drag reduction effect and the washing effect of a foam discharging agent or a foam discharging rod and by means of stirring caused by other process reproduction processes, so that effusion is reduced.
However, the prior art has the following problems in bubble removal: for a vertical well, the foam discharging agent is thrown from a well bore opening and can reach a well bottom through self gravity, for some horizontal wells, the foam discharging agent is mostly in a rod-shaped structure, is easy to stick to a wall when thrown into the well, is light in weight, cannot reach the joint of the bottom of an inclined well section and a horizontal section through self gravity, and cannot meet foam drainage gas production of the horizontal well; secondly, the foaming capacity of the foam discharging agent is low under the condition that no airflow is stirred at the bottom of the well, so that the gas production effect of the foam discharging agent is influenced; and thirdly, the depth of the shaft is more than or equal to 2000 and less than or equal to 3500 meters, the bottom temperature is less than or equal to 120 ℃, the oil well is deeper, and the existing foam discharging rod or liquid foam discharging agent is dissolved when meeting water, so that the foam discharging rod or liquid foam discharging agent is dissolved before reaching the bottom of the shaft, and the utilization rate of the foam discharging rod or liquid foam discharging agent is reduced.
Disclosure of Invention
In order to solve the technical problems that the existing foam discharging agent is easy to stick to the wall, light in weight, free of air flow stirring and easy to dissolve, the invention provides the foam discharging agent for the gas field, which is not easy to stick to the wall, has the density higher than that of water, consumes long time in the dissolving process, can fall on the bottom of the well by the self weight and fully contact with accumulated liquid, generates air flow stirring at the bottom of the well and improves the foam discharging effect.
In order to achieve the purpose, the invention adopts the technical scheme that:
a foam discharging agent for a gas field comprises a solid foam discharging agent and an outer shell wrapped outside the solid foam discharging agent; the solid foam discharging agent and the outer shell are both spheroids or spheroids with hollow interiors; the outer shell is made of a slow-dissolving coating material; the solid foam discharging agent is a solid foam discharging agent made of foaming materials; the mass ratio of the foaming material to the coating material is 6: 1-6: 5.
further, the mass ratio of the foaming material to the coating material is 6: 2-6: 4; optimally, the mass ratio of the foaming material to the coating material is 6: 4.
further, the coating material is polyvinyl alcohol PVA, polyvinyl acetate VAE emulsion, the compound of the polyvinyl alcohol PVA and the polyvinyl acetate VAE emulsion, the compound of the polyvinyl alcohol PVA, the polyvinyl acetate VAE emulsion and silicone acrylic emulsion, the compound of the polyvinyl alcohol PVA, the polyvinyl acetate VAE emulsion and styrene acrylic emulsion or the compound of the polyvinyl alcohol PVA, the polyvinyl acetate VAE emulsion and pure acrylic emulsion.
Further, when the coating material is a composite of polyvinyl alcohol PVA and polyvinyl acetate VAE emulsion, the mass ratio of the polyvinyl alcohol PVA to the polyvinyl acetate VAE emulsion is 1: 3-3: 1; preferably, the mass ratio of the polyvinyl alcohol PVA to the polyvinyl acetate VAE emulsion is 1: 1.
further, when the coating material is a compound of polyvinyl alcohol PVA, polyvinyl acetate VAE emulsion and silicone-acrylic emulsion, a compound of polyvinyl alcohol PVA, polyvinyl acetate VAE emulsion and styrene-acrylic emulsion, or a compound of polyvinyl alcohol PVA, polyvinyl acetate VAE emulsion and pure acrylic emulsion, the mass ratio of the polyvinyl alcohol PVA, the polyvinyl acetate VAE emulsion, the silicone-acrylic emulsion or the styrene-acrylic emulsion or the pure acrylic emulsion is respectively 2: 1: 1.
further, the foaming material comprises a main foaming agent, an auxiliary foaming agent and a foam stabilizer; 75-90% of the main foaming agent and 6-22% of the auxiliary foaming agent; the foam stabilizer is 3-5%; the main foaming agent is C12-C14 higher alcohol sulfate; the auxiliary foaming agent is M series monoamine polyether, D series diamine polyether or T series triamine polyether; the foam stabilizer is C14-C18 stearic acid alcohol amide or stearic acid diethanol amide.
Further, a cavity is arranged between the solid foam discharging agent and the outer shell; and the cavity is filled with a liquid foam discharging agent.
Further, the foam discharging agent for the gas field further comprises a connecting pipe arranged between the outer shell and the cavity; one end of the connecting pipe is connected with the inner edge of the outer shell, and the other end of the connecting pipe is connected with the outer edge of the solid foam discharging agent.
Further, a diaphragm is arranged inside the solid foam discharging agent, and the solid foam discharging agent is divided into two chambers through the diaphragm; the number of the connecting pipes is two; one end of the connecting pipe is connected with the inner edge of the outer shell, and the other end of the connecting pipe is in contact with the outer edge of the diaphragm.
Further, the membrane is a water-soluble membrane; the thickness of the outer shell is 1-4 mm.
The invention has the beneficial effects that:
1. in the present invention, the defoaming agent comprises a foaming material (solid defoaming agent) and a coating material (outer shell); the mass ratio of the foaming material to the coating material is 6: 1-6: 5, preferably, the mass ratio of the foaming material to the coating material is 6: 4; at the moment, the foaming agent has longer dissolving time in water, the foaming agent can be ensured to reach the contact between the bottom of the well and accumulated liquid, and the utilization rate of the foaming agent is high.
2. In the invention, when the coating material is a composite of polyvinyl alcohol PVA and polyvinyl acetate VAE emulsion, the mass ratio of the polyvinyl alcohol PVA to the polyvinyl acetate VAE emulsion is 1: 3-3: 1; preferably, the mass ratio of the polyvinyl alcohol PVA to the polyvinyl acetate VAE emulsion is 1: 1, the dissolution time of the foam discharging agent (outer shell) is longest, and the slow dissolution effect is best.
3. In the invention, the outer shell and the solid foam discharging agent are both hollow spheroids or hollow spheroids, when the foam discharging agent is put in a well bottom, the contact between the foam discharging agent and the well bottom is point contact, the contact area is small, so that the risk that the foam discharging device is stained with the wall can be reduced, the solid foam discharging agent can reach the well bottom along with the outer shell, and the foam discharging effect is good.
4. According to the invention, a cavity is formed between the outer shell and the solid foam discharging agent, and the liquid foam discharging agent is arranged in the cavity, so that the density of the foam discharging agent is greater than that of water, after the foam discharging agent is thrown into a well, the liquid foam discharging agent can cling to the solid foam discharging agent and the outer shell due to the action of gravity, and rolling friction is generated between the solid foam discharging agent and the liquid foam discharging agent, so that the foam discharging agent continuously rolls downwards until the foam discharging agent falls to the bottom of the well, and the foam discharging and gas production of a horizontal well are met.
5. In the invention, a connecting pipe is arranged between the outer shell and the cavity, one end of the connecting pipe is connected with the outer shell, and the other end of the connecting pipe is contacted with the outer edge of the diaphragm; ferric chloride and potassium carbonate are respectively filled in the two cavities of the solid foam discharging agent; after the shell body is dissolved, accumulated water enters through the connecting pipe and contacts with the diaphragm to be dissolved, iron chloride and potassium carbonate in the solid foam discharging agent are in contact reaction to generate heat and bubbles, so that generated air flow is sprayed out from the connecting pipe and the foam discharging agent is stirred, and under the action of stirring, the solid foam discharging agent (foaming material) is dissolved, foams are generated, and the foam discharging utilization rate is improved.
Drawings
FIG. 1 is a schematic structural view of the foam discharging agent of the present invention:
wherein:
1-outer shell, 2-liquid foam discharging agent, 3-solid foam discharging agent, 4-connecting pipe, 5-potassium carbonate, 6-ferric chloride and 7-diaphragm.
Detailed description of the preferred embodiments
The present invention will now be described in detail with reference to the accompanying drawings and examples.
Example 1
Referring to fig. 1, the foam discharging agent for gas fields provided by the invention comprises a solid foam discharging agent 3 and an outer shell 1 wrapped outside the solid foam discharging agent 3, wherein both the solid foam discharging agent 3 and the outer shell 1 are hollow spheroids or hollow spheroids; and a cavity is arranged between the solid foam discharging agent 3 and the outer shell 1.
Referring to fig. 1, in the present embodiment, the outer shell 1 is made of a slow-soluble coating material; the thickness of the outer shell 1 is 1-4 mm; the solid foam discharging agent 3 is a hollow spherical solid foam discharging agent, the solid foam discharging agent 3 is a solid foam discharging agent made of a foaming material, and the foaming material comprises a main foaming agent, a co-foaming agent and a foam stabilizer.
In this example, the coating material was 17%; the foaming material is 83 percent, wherein the main foaming agent is 90 percent, and the auxiliary foaming agent is 6 percent; the foam stabilizer is 4 percent.
In this example, the coating material is polyvinyl alcohol PVA, the main foaming agent is C12 higher alcohol sulfate, the auxiliary foaming agent is M-series monoamine polyether, and the foam stabilizer is C14 stearic acid ethanolamide.
In this example, the manufacturing process of the defoaming agent is: 1) mixing and stirring the main foaming agent, the auxiliary foaming agent and the foam stabilizer uniformly, drying and grinding the mixture into a 100-micron granular foaming material by using a grinding machine; 2) placing the coating material in a model to form a film with the thickness of 5mm, and air-drying the film; 3) and (3) wrapping the granular foaming material in the coating material, sealing and molding to form the slow-dissolving type foam discharging agent.
In the embodiment, in the process of putting the foam discharging agent into the well bottom, as the shell 1 (coating material) and the solid foam discharging agent 3 (foaming material) are both spherical bodies, when the foam discharging agent falls down, the contact between the foam discharging agent and the well wall is point contact, the contact area is small, the probability of wall staining is greatly reduced, and the risk of wall staining is low; meanwhile, the dissolving time of the shell 1 (coating material) of the foam discharging agent is long, the foam discharging agent achieves the effect of slow dissolution in the falling process, the foam discharging agent can reach the bottom of a well, at the moment, accumulated water is in contact with the foam discharging agent, the shell 1 is dissolved, the solid foam discharging agent 3 is dissolved, the foam discharging utilization rate is good, the accumulated water is reduced, and the gas recovery rate is improved.
Example 2
Unlike embodiment 1, in this embodiment, a liquid defoaming agent 2 is provided in a cavity between a solid defoaming agent 3 and an outer shell 1;
in this example, the coating material was 25%; 75% of foaming material, wherein the main foaming agent is 75% and the auxiliary foaming agent is 22%; the foam stabilizer is 3 percent.
In this example, the coating material is polyvinyl alcohol PVA, the main foaming agent is C14 higher alcohol sulfate, the auxiliary foaming agent is D-series diamine polyether, and the foam stabilizer is C15 stearic acid ethanolamide.
In this embodiment, when the defoaming agent is put into the well bottom, because liquid defoaming agent, make the bulk density of defoaming agent be greater than the density of water, after the defoaming agent throws into water, because the effect of gravity, shell body 1 and solid defoaming agent 3 can be hugged closely to liquid defoaming agent 2, can produce rolling friction between liquid defoaming agent 2 and the shell body 1 simultaneously, make the defoaming agent roll downwards until reaching the shaft bottom, and in the rolling process, the time that shell body 1 dissolves is long, guarantee that the defoaming agent just takes place to dissolve after reaching the shaft bottom, inside liquid defoaming agent 2 of defoaming agent and solid defoaming agent 3 all contact with shaft bottom ponding and take place to dissolve the back, play the defoaming effect, improve the gas production rate.
Example 3
Different from the embodiment 1, in the embodiment, two chambers are separated by a diaphragm 7 in the center of the inside of the solid foam discharging agent 3, one chamber is filled with ferric chloride 6, the other chamber is filled with potassium carbonate 5, a connecting pipe 4 is arranged between the outer shell 1 and the cavity, and one or two connecting pipes 4 are arranged.
Specifically, referring to fig. 1, the number of the connecting pipes 4 is two, the two connecting pipes are respectively and symmetrically arranged on two sides of the diaphragm 7, one end of each connecting pipe 4 is connected with the inner edge of the outer shell 3, the other end of each connecting pipe 4 is in contact with the outer edge of the diaphragm 7, and the diaphragm 7 is a water-soluble diaphragm.
In this example, the coating material was 33%; the foaming material is 67%, wherein: 80% of main foaming agent and 15% of auxiliary foaming agent; 5 percent of foam stabilizer.
In this example, the coating material is polyvinyl alcohol PVA, the main foaming agent is C13 higher alcohol sulfate, the auxiliary foaming agent is T series triamine polyether, and the foam stabilizer is C16 stearic acid ethanolamide.
In the embodiment, when the foam discharging agent is placed in the well, the foam discharging agent can sink to the joint of the bottom of the inclined well section and the horizontal section due to the self gravity, and the dissolution time of the outer shell 1 (coating material) is long in the settling process, so that the foam discharging agent is ensured to fall to the bottom of the inclined well section; and then the outer shell 1 (coating material) is dissolved firstly, the accumulated liquid enters from the connecting pipe 4 and contacts with the water-soluble diaphragm 7 to be continuously dissolved, after the water-soluble diaphragm 7 is dissolved, the ferric chloride 6 and the potassium carbonate 5 in the two cavities of the solid foam discharging agent 3 are mixed and react to generate heat and bubbles, the pressure inside the solid foam discharging agent 3 is large, so that two air flows are continuously sprayed out from the connecting pipe 4 and generate stirring action, under the stirring action, the solid foam discharging agent 3 is promoted to be dissolved, foams are generated to act on the accumulated liquid, the accumulated liquid is reduced, and the gas production rate is improved.
Example 4
The difference from example 1 is: in this example, the coating material was 40%; the foaming material is 60 percent, wherein: 85% of main foaming agent and 12% of assistant foaming agent; the foam stabilizer is 3 percent.
In this example, the coating material is polyvinyl alcohol PVA, the main foaming agent is C14 higher alcohol sulfate, the auxiliary foaming agent is M-series monoamine polyether, and the foam stabilizer is C17 stearic acid ethanolamide.
Example 5
The difference from example 1 is: in this example, the coating material was 45.5%; the foaming material is 54.5%, wherein: 87% of main foaming agent and 9% of assistant foaming agent; the foam stabilizer is 4 percent.
In this example, the coating material is polyvinyl alcohol PVA, the main foaming agent is C16 higher alcohol sulfate, the auxiliary foaming agent is D-series monoamine polyether, and the foam stabilizer is C17 stearic acid ethanolamide.
In order to show the performance of the foam discharging agent prepared by the coating material and the foaming material with different mass ratios when the coating material is polyvinyl alcohol PVA, test verification is carried out.
Test procedure a defoaming agent was prepared according to the mass ratio of the foaming material to the polyvinyl alcohol PVA (coating material) provided in examples 1 to 5, and the foaming power and the dissolution time were measured at 90 c, and the results are shown in table 1.
TABLE 1 foam-eliminating agent made of foaming material and coating material with different mass ratios
| Serial number | Proportioning | Foaming power (mm) | Dissolution time (h) |
| Example 1 | Foaming material: PVA 6: 1 | 130 | 8 |
| Example 2 | Foaming material: PVA 6: 2 | 130 | 15 |
| Example 3 | Foaming material: PVA 6: 3 | 120 | 19 |
| Example 4 | Foaming material: PVA 6: 4 | 120 | 21 |
| Example 5 | Foaming material: PVA 6: 5 | 110 | 23 |
As can be seen from table 1, when the foaming material: PVA 6: when 4, the foaming power is 120mm, the dissolving time can reach 21 hours, and the comprehensive performance of the foam discharging agent is better.
Example 6
Different from the embodiment 4, the coating material is the compound of polyvinyl alcohol PVA and polyvinyl acetate VAE emulsion, wherein, the foaming material: PVA: VAE emulsion 6: 3: 1.
example 7
Different from the embodiment 4, the coating material is the compound of polyvinyl alcohol PVA and polyvinyl acetate VAE emulsion, wherein, the foaming material: PVA: VAE emulsion 6: 2: 2.
example 8
Different from the embodiment 4, the coating material is the compound of polyvinyl alcohol PVA and polyvinyl acetate VAE emulsion, wherein, the foaming material: PVA: VAE emulsion 6: 1: 3.
example 9
In contrast to example 4, the coating material was a blend of polyvinyl acetate VAE emulsions, wherein the foaming material: PVA: VAE emulsion 6: 0: 4.
in order to illustrate the slow dissolving performance of the foam discharging agent when the coating material composition is different and the mass ratio is different, the slow dissolving time of the foam discharging agent in examples 6 to 9 in water of 100 ℃ is compared, and the results are shown in Table 2.
TABLE 2 dissolution times for five groups of different coating material mass ratios
| Serial number | Proportioning | Dissolution time (h) |
| Example 9 | Foaming material: PVA: VAE emulsion 6: 0: 4 | 25 |
| Example 8 | Foaming material: PVA: VAE emulsion 6: 1: 3 | 27 |
| Example 7 | Foaming material: PVA: VAE emulsion 6: 2: 2 | 30 |
| Example 6 | Foaming material: PVA: VAE emulsion 6: 3: 1 | 22 |
By comparing table 2, it was found that when the foam: PVA: the mass ratio of the VAE emulsion is 6: 1: 3. foaming material: PVA: VAE emulsion mass ratio 6: 2: 2 or the foaming material: VAE emulsion 6: 4, the dissolution time of the foam discharging agent in water exceeds 25 hours; in particular, when the foaming material: PVA: VAE emulsion 6: 2: in case 2, the dissolution time of the defoaming agent may be as long as 30 hours.
Example 10
The difference of this embodiment 7 is that the outer shell 1 is made of a slow-soluble coating material, and the coating material is a combination of polyvinyl alcohol PVA, polyvinyl acetate VAE emulsion, and silicone-acrylate emulsion, wherein the foaming material: PVA: VAE emulsion: the silicone-acrylic emulsion is 6: 2: 1: 1.
example 11
Unlike example 7, in this example, the coating material is a mixture of polyvinyl alcohol PVA, polyvinyl acetate VAE emulsion, and styrene-acrylic emulsion, wherein the foaming material: PVA: VAE emulsion: the styrene-acrylic emulsion is 6: 2: 1: 1.
example 12
Unlike example 7, in this example, the coating material is a mixture of polyvinyl alcohol PVA, polyvinyl acetate VAE emulsion and acrylic emulsion, wherein the foaming material: PVA: VAE emulsion: the pure acrylic emulsion is 6: 2: 1: 1.
results comparison, in order to illustrate the dissolution times of the foam release agents prepared in example 10, example 11 and example 12, the dissolution times in water and a retrograde comparison were made, and the results are shown in table 3.
TABLE 3 dissolution time of the foam depressants made of coating materials of different materials
| Serial number | Proportioning | Dissolution time (h) |
| Example 10 | Foaming material: PVA: VAE emulsion: silicone-acrylic emulsion ═ 6: 2: 1: 1 | 23 |
| Example 11 | Foaming material: PVA: VAE emulsion: styrene-acrylic emulsion 6: 2: 1: 1 | 24 |
| Example 12 | Foaming material: PVA: VAE emulsion: pure acrylic emulsion ═ 6: 2: 1: 1 | 24 |
As can be seen from table 3, in the foam discharging agent, when the coating material is three formulations of PVA, VAE emulsion and styrene-acrylic emulsion or three formulations of PVA, VAE emulsion and acrylic emulsion, and the foaming material: PVA: VAE emulsion: styrene-acrylic emulsion (or pure acrylic emulsion) ═ 6: 2: 1: 1 hour, the dissolution time of the defoaming agent in water was 24 hours.
In conclusion, when the foam discharging agent prepared by the invention is applied to gas field for foam discharging, the dissolution speed of the coating material of the outer shell is slow, so that the foam discharging agent can smoothly reach the bottom of the well; meanwhile, the structure of the foam discharging agent is spherical or quasi-spherical, in the feeding process, the foam discharging agent is in point contact with the well wall, the contact area is greatly reduced, the risk of being stained with the wall is reduced, the overall mass density of the foam discharging agent can be increased by the liquid foam discharging agent, and the foam discharging agent can fall down by the gravity of the foam discharging agent; and when the foam discharging agent falls on the shaft bottom, the outer shell is slowly dissolved, liquid enters from the connecting pipe to dissolve the diaphragm, heat is generated inside the solid foam discharging agent 3 and stirring is outwards generated from the connecting pipe 4, the foam discharging agent can be effectively contacted with accumulated water at the shaft bottom to generate a large amount of low-density water-containing foam, the purpose of removing accumulated water at the shaft bottom is achieved, the consequence caused by the accumulated water is avoided, and the gas production efficiency is improved.
Claims (10)
1. A foam discharging agent for gas fields, which is characterized in that: the foam discharging agent for the gas field comprises a solid foam discharging agent (3) and an outer shell (1) wrapped outside the solid foam discharging agent (3); the solid foam discharging agent (3) and the outer shell (1) are both spheroids or spheroids with hollow interiors; the outer shell (1) is made of a slow-dissolving coating material; the solid foam discharging agent (3) is a solid foam discharging agent made of foaming materials; the mass ratio of the foaming material to the coating material is 6: 1-6: 5.
2. the foam venting agent for gas fields according to claim 1, wherein: the mass ratio of the foaming material to the coating material is 6: 2-6: 4; preferably, the mass ratio of the foaming material to the coating material is 6: 4.
3. the foam venting agent for gas fields according to claim 2, wherein: the coating material is polyvinyl alcohol (PVA), polyvinyl acetate (VAE) emulsion, the compound of the PVA and the VAE, the compound of the PVA, the VAE and silicone-acrylic emulsion, the compound of the PVA, the VAE and the styrene-acrylic emulsion, or the compound of the PVA, the VAE and the acrylic emulsion.
4. The foam venting agent for gas fields according to claim 3, wherein: when the coating material is a composite of polyvinyl alcohol PVA and polyvinyl acetate VAE emulsion, the mass ratio of the polyvinyl alcohol PVA to the polyvinyl acetate VAE emulsion is 1: 3-3: 1, preferably, the mass ratio of the polyvinyl alcohol PVA to the polyvinyl acetate VAE emulsion is 1: 1.
5. the foam venting agent for gas fields according to claim 3, wherein: when the coating material is a compound of polyvinyl alcohol PVA, polyvinyl acetate VAE emulsion and silicone-acrylate emulsion, a compound of polyvinyl alcohol PVA, polyvinyl acetate VAE emulsion and styrene-acrylate emulsion, or a compound of polyvinyl alcohol PVA, polyvinyl acetate VAE emulsion and pure acrylic emulsion, the mass ratio of the polyvinyl alcohol PVA, the polyvinyl acetate VAE emulsion and the silicone-acrylate emulsion or the styrene-acrylate emulsion or the pure acrylic emulsion is respectively 2: 1: 1.
6. the foam venting agent for gas fields according to claim 2, wherein: the foaming material comprises a main foaming agent, an auxiliary foaming agent and a foam stabilizer; 75-90% of the main foaming agent and 6-22% of the auxiliary foaming agent; the foam stabilizer is 3-5%; the main foaming agent is C12-C14Higher alcohol sulfate salts; the assistant foaming agent is M series monoamine polyether and D series bisAmine polyethers or T-series triamine polyethers; the foam stabilizer is C14-C18Stearic acid alkanolamide or stearic acid diethanolamide.
7. The foam discharging agent for gas fields according to claims 1 to 6, wherein: a cavity is arranged between the solid foam discharging agent (3) and the outer shell (1); the cavity is filled with a liquid foam discharging agent (2).
8. The foam venting agent for gas fields according to claim 7, wherein: the foam discharging agent for the gas field further comprises a connecting pipe (4) arranged between the outer shell (1) and the cavity; one end of the connecting pipe (4) is connected with the inner edge of the outer shell (1), and the other end of the connecting pipe (4) is connected with the outer edge of the solid foam discharging agent (3).
9. The foam venting agent for gas fields according to claim 8, wherein: a diaphragm (7) is arranged in the solid foam discharging agent (3), and the solid foam discharging agent (3) is divided into two chambers by the diaphragm (7); the number of the connecting pipes (4) is two; one end of the connecting pipe (4) is connected with the inner edge of the outer shell (1), and the other end of the connecting pipe (4) is in contact with the outer edge of the diaphragm (7).
10. The foam venting agent for gas fields according to claim 9, wherein: the diaphragm (7) is a water-soluble diaphragm; the thickness of the outer shell (1) is 1-4 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911381320.5A CN111073619A (en) | 2019-12-27 | 2019-12-27 | Foam discharging agent for gas field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911381320.5A CN111073619A (en) | 2019-12-27 | 2019-12-27 | Foam discharging agent for gas field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111073619A true CN111073619A (en) | 2020-04-28 |
Family
ID=70319004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911381320.5A Pending CN111073619A (en) | 2019-12-27 | 2019-12-27 | Foam discharging agent for gas field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111073619A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112961659A (en) * | 2021-02-08 | 2021-06-15 | 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 |
| CN113046049A (en) * | 2021-03-29 | 2021-06-29 | 西南石油大学 | Multi-water-layer four-dispersion foam scrubbing agent for natural gas horizontal well |
| CN117304906A (en) * | 2023-09-25 | 2023-12-29 | 郑州市新郑梅久实业有限公司 | Foam discharging agent for gas production and application thereof |
-
2019
- 2019-12-27 CN CN201911381320.5A patent/CN111073619A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112961659A (en) * | 2021-02-08 | 2021-06-15 | 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 |
| 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 |
| CN113046049A (en) * | 2021-03-29 | 2021-06-29 | 西南石油大学 | Multi-water-layer four-dispersion foam scrubbing agent for natural gas horizontal well |
| CN113046049B (en) * | 2021-03-29 | 2022-05-06 | 西南石油大学 | Multi-water-layer four-dispersion foam scrubbing agent for natural gas horizontal well |
| CN117304906A (en) * | 2023-09-25 | 2023-12-29 | 郑州市新郑梅久实业有限公司 | Foam discharging agent for gas production and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111073619A (en) | Foam discharging agent for gas field | |
| US8901065B2 (en) | Spray-drying process | |
| CN101462844B (en) | Environment protection type efficient aerating powder for shield construction | |
| CN106244128B (en) | A kind of environment-friendly type foam drainage rod and preparation method thereof | |
| CN109574543B (en) | Composite foaming agent for cast-in-situ foam concrete | |
| EP2336289B1 (en) | A spray-drying process | |
| CN201337367Y (en) | Nano bubble bath generating device | |
| CN106978155B (en) | A kind of disturbance capsule shape solid foam discharging agent certainly | |
| CN106190080B (en) | A kind of spherical solid foam discharging agent for natural gas fluctuating horizontal well | |
| US8568629B2 (en) | Spray-Drying process | |
| CN106988713A (en) | A kind of new floatability solid bubble rod row and preparation method thereof | |
| CN106221687A (en) | A kind of gas field foam drainage rod and preparation method thereof | |
| CN108690590B (en) | Gas well foam scrubbing agent and preparation method and application thereof | |
| CN212296328U (en) | Foam discharging agent structure for gas field | |
| CN102660239A (en) | Antifreezing foam scrubbing agent and its preparation technology | |
| CN104342096A (en) | Sustained-release foaming agent | |
| CN107474811B (en) | Micro-foam acid liquid and preparation method thereof | |
| CN109777393A (en) | A kind of foam flooding finish | |
| CN111073623A (en) | Slow-dissolving type foam discharging agent for gas field | |
| CN113403044B (en) | Micro-foam foaming system for drilling fluid | |
| US8361357B2 (en) | Spray-drying process | |
| CN113046049B (en) | Multi-water-layer four-dispersion foam scrubbing agent for natural gas horizontal well | |
| CN113913170B (en) | Effervescent foam drainage agent for natural gas exploitation and preparation method thereof | |
| CN114316352A (en) | Green preparation method and device of biological foam material | |
| US20110147967A1 (en) | Spray-Drying Process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |