CN115433558A - Gas well self-produced gas drainage energy-increasing flowback agent and application thereof - Google Patents
Gas well self-produced gas drainage energy-increasing flowback agent and application thereof Download PDFInfo
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- CN115433558A CN115433558A CN202211088890.7A CN202211088890A CN115433558A CN 115433558 A CN115433558 A CN 115433558A CN 202211088890 A CN202211088890 A CN 202211088890A CN 115433558 A CN115433558 A CN 115433558A
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- 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
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Abstract
The invention relates to the technical field of gas well drainage, in particular to a gas well self-generated gas drainage energizing flowback agent and an application thereof, wherein the flowback agent comprises the following components: surfactant AEO, sodium dodecyl sulfate, silicone polyether emulsion, alpha-sodium alkenyl sulfonate, fluorocarbon surfactant and amphoteric surfactant OB-2. The flowback agent can effectively reduce the surface tension of liquid, is arranged on a double-electron layer on the surface of a liquid film to surround air to form bubbles, and then forms foam by single bubble, has salt resistance and condensate oil resistance, can be applied to a foam drainage gas production process, has high and stable foaming thickness, can quickly discharge accumulated liquid in a well, and plays a role in energy-increasing flowback.
Description
Technical Field
The invention relates to the technical field of gas well drainage, in particular to a gas well self-generated gas drainage energizing flow-back agent and application thereof.
Background
With the deep development of a large number of gas fields, many gas wells have the problems of continuous pressure reduction, increasing water production wells, serious accumulated liquid in shafts and the like, so that the yield of the gas wells is continuously reduced. The gas lift liquid drainage cost is too high, and the gas well water lock releasing effect is not obvious. The energy-increasing back-drainage water-discharging gas-producing technology is characterized by that a certain quantity of self-gas-producing water-discharging energy-increasing back-drainage agent is injected into the well, after the accumulated water at bottom of the well is contacted with back-drainage agent, a large quantity of low-density water-containing foam can be produced by means of stirring of natural gas flow, and can be carried along with the gas flow to the ground from bottom of the well so as to attain the goal of removing accumulated liquid at bottom of the well. The effective foaming thickness of the existing flow-back agent is not high, so that the foam drainage effect is reduced, and the accumulated water flow-back efficiency in a well is influenced.
Disclosure of Invention
Aiming at the technical problem that the existing flowback agent is low in energy storage coefficient, the invention provides the gas well self-produced gas drainage energy-increasing flowback agent and the application thereof.
In a first aspect, the invention provides a gas well self-produced gas drainage energy-increasing flowback agent, which comprises the following components: surfactant AEO, sodium dodecyl sulfate, silicone polyether emulsion, alpha-sodium alkenyl sulfonate, fluorocarbon surfactant and amphoteric surfactant OB-2.
Further, the composition comprises the following components in parts by weight: 9 to 10 parts of surfactant AEO, 3236 parts of sodium dodecyl sulfate, 3236 parts of zxft, 5262 parts of silicone resin polyether emulsion, 9 to 10 parts of alpha-alkenyl sodium sulfonate, 3763 parts of fluorocarbon surfactant, 3763 parts of zxft, and 2 to 9 parts of amphoteric surfactant OB-2.
Further, the composition comprises the following components in parts by weight: the composition comprises the following components in parts by weight: 9.5 parts of surfactant AEO, 8 parts of sodium dodecyl sulfate, 4 parts of silicone resin polyether emulsion, 9 parts of alpha-sodium alkenyl sulfonate, 4 parts of fluorocarbon surfactant and 2 parts of amphoteric surfactant OB-2.
Further, the surfactant AEO is AEO-7.
Further, the surface tension of the flow-back agent is less than or equal to 35mN/m; mixing the flowback agent with formation water at 80 +/-1 ℃, wherein the foam height is more than or equal to 150mm at the beginning, and is more than or equal to 60mm after 3min; the liquid carrying amount of the flowback agent is more than or equal to 100mL/15min.
In a second aspect, the invention provides an application of the gas well self-produced gas drainage energizing flowback agent in flowing back of accumulated liquid in a gas well.
Further, the gas well is a low-pressure gas well with the pressure of 0.5 to 2Mpa.
Furthermore, the flowback agent is injected into the gas well and mixed with the liquid accumulated in the well in any proportion.
Furthermore, the mineralization degree of the liquid accumulation in the gas well is 5000 to 75000ppm.
The gas well self-gas-generation drainage energy-increasing flow-back agent provided by the invention has the beneficial effects that the surface tension of liquid can be effectively reduced, the double electronic layers are arranged on the surface of a liquid film to surround air to form bubbles, and then the bubbles are formed by single bubbles, so that the gas well self-gas-generation drainage energy-increasing flow-back agent has salt resistance and condensate oil resistance, can be applied to a foam drainage gas production process, has high and stable foaming thickness, can quickly discharge accumulated liquid in a well, and has an energy-increasing flow-back effect.
Drawings
In order to more clearly illustrate the embodiments or prior art solutions of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a microscopic view of a bubble foam according to an embodiment of the present invention.
FIG. 2 is a graph of temperature versus height of the flowback agent foam of an embodiment of the present invention.
FIG. 3 is a graph showing the relationship between the temperature and the amount of liquid carried by the flow-back agent in accordance with the embodiment of the present invention.
FIG. 4 is a graph of mineralization versus height of the flowback agent foam in accordance with an embodiment of the present invention.
FIG. 5 is a graph showing the relationship between the amount of liquid carried by the mineralization agent in accordance with an embodiment of the present invention.
FIG. 6 is a graph of condensate content versus flowback agent foam height for an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The gas well self-generated gas drainage energy-increasing flowback agent comprises the following components in parts by weight: 9.5 parts of AEO-7, 8 parts of sodium dodecyl sulfate, 4 parts of silicone polyether emulsion, 9 parts of alpha-sodium alkenyl sulfonate, 4 parts of fluorocarbon surfactant and 2 parts of amphoteric surfactant OB-2.
Through detection, the flowback agent prepared by the embodiment has the following performance indexes: surface tension: 21.6mN/m; mixing the flowback agent with simulated formation water at the temperature of 80 +/-1 ℃, wherein the foam height of the bubbles is 180mm after the beginning of the foaming process, and is 145mm after the beginning of the foaming process is 3min; the liquid carrying amount is 185ml/15min. All the performance indexes are higher than the technical and economic index requirements.
The flowback agent prepared in this example was mixed with formation water and observed: no sediment and floccule are generated, the product can be mutually dissolved with the formation water in any proportion, the compatibility of the energy-increasing flow-back agent and the formation water is good, and the formed foam microscopic picture is shown in figure 1, and the visible foam is relatively uniform and stable.
FIG. 2 shows the foam rise height of the prepared flowback agent at different temperatures, and it can be seen that at 20-100 ℃ the foam height is greater than 165mm, the foam height increases first and then decreases with increasing temperature, with 70 ℃ being the best;
FIG. 3 shows the liquid carrying capacity of the prepared flow-back agent at different temperatures every 15min, and it can be seen that at 20-100 ℃, the liquid carrying capacity is more than 155mL, the liquid carrying capacity increases and then decreases with the increase of the temperature, wherein the effect at 70 ℃ is the best;
FIG. 4 shows the foam height of the prepared flowback agent at different degrees of mineralization, and it can be seen that in 5000-75000ppm of mineralized formation water, the foam height gradually decreases with increasing degree of mineralization, and the foam height is 170mm at the lowest;
fig. 5 shows the liquid carrying capacity of the prepared flowback agent every 15min under different mineralization degrees, and it can be seen that in the mineralized formation water with 5000-75000ppm, the liquid carrying capacity is increased and then decreased, and the liquid carrying capacity is 173mL at minimum;
fig. 6 shows the foam height of the prepared flowback agent at different condensate contents, and it can be seen that when the condensate content is lower than 7%, the performance is slightly reduced with the increase of the condensate, when the condensate exceeds 7%, the performance is sharply reduced, and when the condensate reaches 11%, the performance of the energy-increasing flowback agent is completely disappeared, and according to the test data, the oil resistance of the condensate is determined to be 7%.
Example 2
The gas well self-generated gas drainage energy-increasing flowback agent comprises the following components in parts by weight: 9 parts of AEO-7, 9 parts of sodium dodecyl sulfate, 6 parts of silicone polyether emulsion, 10 parts of alpha-sodium alkenyl sulfonate, 5 parts of fluorocarbon surfactant and 9 parts of amphoteric surfactant OB-2, and the components are mixed in proportion to obtain the water-based paint.
Example 3
The gas well self-generated gas drainage energy-increasing flowback agent comprises the following components in parts by weight: AEO-7 parts, sodium dodecyl sulfate 8.5 parts, silicone polyether emulsion 5 parts, alpha-sodium alkenyl sulfonate 9.5 parts, fluorocarbon surfactant 4.5 parts, amphoteric surfactant OB-2 parts, and the components are mixed in proportion to obtain the water-soluble polyurethane emulsion.
Example 4
In this example, the water quality of the wells in the Shanxi Taiyuan Su 77 and the recall 51 zone 247 is analyzed, and the specific results of the average concentration of each ion are shown in Table 1.
TABLE 1 Shanxi Taiyuan Su 77, recall 51 Block 247 Mount well Water quality
The ion content of the produced water of each well in the Su 77 and call 51 block parts is greatly different. As can be seen in Table 1, the cation is represented by Na + 、Ca 2+ 、Mg 2+ Mainly of Na + The content of Ca is 2071 to 30309mg/L 2+ Content 1870-33001 Mg/L, mg 2+ The content is 587-15173 mg/L; the major anion Cl - 3469-77149 mg/L of HCO 3 - Content of 0-1020 mg/L, SO 4 2- The content is 0 to 11863mg/L; the total mineralization is between 7.74 and 121.93 g/L. According to the classification standard of Su Lin, the CaCl is adopted 2 Water type.
In the principle of well selection, the emphasis is placed on wells with 'large atmospheric water', 'small gas and small water', the wells are more suitable for foam drainage gas production process, and the wells are low-pressure gas wells with daily output of more than 3000 and water-gas ratio of less than 8/ten thousand and 0.5-2 Mpa.
By adopting the flowback agent prepared in the embodiment 1 and adopting a flowback process for well selection, through indoor tests, the flowback agent prepared by the invention has a very good application effect when the concentration of the flowback agent in formation water is 0.4%. The filling quantity can therefore be calculated according to the following formula:
filling amount = (wellbore liquid volume + filling period × yield × 0.03%) × 0.4%;
judging whether the gas well produces accumulated liquid or not, mainly observing whether the yield and the pressure of the gas well fluctuate or not, and aiming at the well with high yield and pressure fluctuation of the gas well, greatly shortening the charging period of the energy-increasing flowback agent. Corresponding filling ratio templates are formed at present.
The field test is carried out for 16 wells, and the average oil jacket pressure difference is reduced by 1.5MPa after the field test is carried out. Compared with a well without the energy-increasing flow-back agent, the average single-well liquid yield is improved by 120 percent, the average single-well yield is increased by 1780 square/day, and 51-25-11 wells are called for 4300 square/day; threo 77-34-30 wells with a well completion yield of 0.38X 10 4 m 3 D, yield rapidly recovered 1.31X 10 after discharging effusion from foam 4 m 3 And d, the sleeve pressure is stably reduced, and the stable drainage effect is ideal. Implement energizationAfter the flowback process, the average yield of the Su-Rige block is improved by 48.7 percent on the whole, and the yield increasing and stabilizing benefits are obvious.
Although the present invention has been described in detail in connection with the preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.
Claims (9)
1. The gas well self-gas-generating drainage energy-increasing flowback agent is characterized by comprising the following components: surfactant AEO, sodium dodecyl sulfate, silicone polyether emulsion, alpha-sodium alkenyl sulfonate, fluorocarbon surfactant and amphoteric surfactant OB-2.
2. The gas well self-gas-production drainage energizing flow-back agent as claimed in claim 1, which comprises the following components in parts by weight: 9 to 10 parts of surfactant AEO, 3236 parts of sodium dodecyl sulfate, 3236 parts of zxft, 5262 parts of silicone resin polyether emulsion, 9 to 10 parts of alpha-alkenyl sodium sulfonate, 3763 parts of fluorocarbon surfactant, 3763 parts of zxft, and 2 to 9 parts of amphoteric surfactant OB-2.
3. The gas well self-gas-production drainage energy-increasing flowback agent as claimed in claim 2, which comprises the following components in parts by weight: the composition comprises the following components in parts by weight: 9.5 parts of surfactant AEO, 8 parts of sodium dodecyl sulfate, 4 parts of silicone resin polyether emulsion, 9 parts of alpha-sodium alkenyl sulfonate, 4 parts of fluorocarbon surfactant and 2 parts of amphoteric surfactant OB-2.
4. The gas well autogenous gas drainage energized flowback agent of claim 1, wherein the surfactant AEO is AEO-7.
5. The gas well self-gas production drainage energizing flowback agent as recited in any of claims 1-4, wherein the flowback agent has a surface tension of 35mN/m or less; mixing the flowback agent with formation water at the temperature of 80 +/-1 ℃, wherein the foam height is more than or equal to 150mm at the beginning and is more than or equal to 60mm after 3min; the liquid carrying amount of the flowback agent is more than or equal to 100mL/15min.
6. The use of the gas well autogenous gas production drainage energizing flowback agent of claim 1 in flowback of liquid in a gas well.
7. The use according to claim 6, wherein the gas well is a low pressure gas well having a pressure of from 0.5 to 2mpa.
8. The use of claim 6, wherein the flowback agent is injected into the well to mix with the liquid accumulated in the well in any proportion.
9. The use according to claim 6, wherein the degree of mineralization of liquid accumulation in a gas well is from 5000 to 75000ppm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211088890.7A CN115433558A (en) | 2022-09-07 | 2022-09-07 | Gas well self-produced gas drainage energy-increasing flowback agent and application thereof |
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| CN202211088890.7A CN115433558A (en) | 2022-09-07 | 2022-09-07 | Gas well self-produced gas drainage energy-increasing flowback agent and application thereof |
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Citations (7)
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| CN101831285A (en) * | 2010-05-24 | 2010-09-15 | 中国石油集团川庆钻探工程有限公司 | High-temperature-resistant high-salt-resistant anti-condensation oil foaming agent for fracturing and preparation method thereof |
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2022
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| US20200172795A1 (en) * | 2018-11-29 | 2020-06-04 | Saudi Arabian Oil Company | Stabilized foams with tailored water chemistry for mobility control in gas injection processes |
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