CN111218267B - Foam scrubbing agent with low foam water content and preparation method thereof - Google Patents
Foam scrubbing agent with low foam water content and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a foam scrubbing agent with low foam water content and a preparation method thereof, wherein the foam scrubbing agent comprises the following components in percentage by weight: 35 to 40 percent of dioctyl methyl hydroxy sulfopropyl betaine, 0.1 to 1 percent of perfluorooctyl sodium sulfonate, 01 to 4 percent of polyethylene glycol 600and 55 to 60 percent of water; the preparation method comprises the following steps: stirring and uniformly mixing dioctyl methyl hydroxy sulfopropyl betaine and water in a reaction container at constant temperature, and then adding polyethylene glycol 6000 to react for 0.5-2 h; and adding the sodium perfluorooctyl sulfonate, and continuously stirring for 15-40min to obtain the foam scrubbing agent with low foam water content. The invention can effectively improve the flowing pressure at the bottom of the well to be lower than 10MPa and the flow rate of the gas well to be less than 5000m3The foam discharging operation effect under the ultralow pressure and low yield condition of the/d is poor.
Description
Technical Field
The invention belongs to the technical field of foam scrubbing agents for oil and gas fields, and particularly relates to a foam scrubbing agent with low foam water content and a preparation method thereof.
Background
In the middle and later stages of natural gas well development, the formation energy is reduced, and formation water enters a near wellbore zone or a wellbore along with natural gas flow and is accumulated at the near wellbore zone or the wellbore zone, so that the yield of a gas well is reduced and even the gas well is drowned by water. In thatIn the drainage and gas production process technology series, the foam drainage process is increasingly generally concerned with due to the advantages of convenient construction, simple equipment, low cost, wide applicable well depth range, quick effect, no influence on normal production of gas wells and the like, and is one of the most economical and effective methods for draining accumulated liquid in wells, improving the yield of natural gas and prolonging the exploitation period of gas wells. The surfactant with special function is added into the accumulated liquid at the bottom of the well from the well mouth of the gas well with insufficient liquid carrying capacity, and is fully contacted with the accumulated liquid at the bottom of the well by virtue of the stirring of natural gas flow, so that a large amount of stable low-density water-containing foam is generated, and the density of a gas-liquid mixture is reduced, thereby greatly reducing the friction loss and the gravity gradient of a liquid column in the shaft of the flowing well, and as a result, under the condition that the pressure at the bottom of the well or the pressure at the well mouth is not changed, the accumulated liquid at the bottom of the well is more easily carried to the ground by the gas flow from the bottom of the well, the vertical liquid lifting capacity of the gas flow is improved, and the purpose of water drainage and gas production is achieved. The success of the foam-stripping process depends to a large extent on the properties of the foam-stripping agent used. The literature reports show that the current flow rate of the gas well is less than 5000m and the bottom hole flow pressure is lower than 10MPa3The foam scrubbing agent special for the ultralow-pressure low-yield gas well is still blank.
The prior foam discharging agent similar to a functional agent is mainly a common foaming agent, the highly foamed effusion in the conventional foam discharging water gas production process has higher density, the integral foam water content is higher, the flowing pressure at the bottom of a well is lower than 10MPa, and the flow rate of a gas well is less than 5000m3The purpose of effectively lifting and discharging accumulated liquid cannot be achieved under the ultralow-pressure low-yield condition of/d. In the prior art, the purpose of drainage and gas production of the gas well is mainly achieved through auxiliary measures such as gas lift, emptying and the like. The gas lift investment is large and the cost is high; and the emptying causes great damage to the gas well and the near well zone, and is not beneficial to long-term exploitation.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a foam discharging agent with low foam water content and a preparation method thereof. The foam discharging agent with low foam water content can stably exist under the condition of extremely small foam film thickness, so that the foam generated by the agent has the ultralow foam water content, and the agent can better reduce the density of accumulated liquid, so that a gas well has effective foam discharging efficiency in the ultralow-pressure low-yield environment.
The technical scheme adopted by the invention is as follows:
a foam scrubbing agent with low foam water content is composed of the following components in percentage by weight: 35 to 40 percent of dioctyl methyl hydroxy sulfopropyl betaine, 0.1 to 1 percent of perfluorooctyl sodium sulfonate, 60001 to 4 percent of polyethylene glycol and 55 to 60 percent of water.
Further, the octyl group of the sodium perfluorooctyl sulfonate is a linear octyl group.
Further, the structural formula of the dioctyl methyl hydroxy sulfopropyl betaine is as follows:
further, the foam scrubbing agent comprises the following components in percentage by weight: 36 to 39 percent of dioctyl methyl hydroxy sulfopropyl betaine, 0.3 to 1 percent of perfluorooctyl sodium sulfonate, 60002 to 4 percent of polyethylene glycol and 56 to 60 percent of water.
A preparation method of a foam scrubbing agent with low foam water content comprises the following steps: stirring and uniformly mixing dioctyl methyl hydroxy sulfopropyl betaine and water in a reaction container at constant temperature, and then adding polyethylene glycol 6000 to react for 0.5-2 h; and adding the sodium perfluorooctyl sulfonate, and continuously stirring for 15-40min to obtain the foam scrubbing agent with low foam water content.
Further, the constant temperature is 50 ℃.
Further, polyethylene glycol 6000 was added for reaction for 1 hour.
Further, the perfluorooctyl sodium sulfonate is added and the stirring is continued for 30 min.
The invention has the beneficial effects that: the foam scrubbing agent with low foam water content and the preparation method thereof can effectively improve the flowing pressure at the bottom of the well to be lower than 10MPa and the flow rate of a gas well to be less than 5000m3D, poor foam discharging operation effect under the condition of ultralow pressure and low yield; fills the blank of the domestic foam discharging agent field with low foam water content; the material selected by the invention has strong foaming capacity, good foam stabilizing effect and low foam water contentThe minimum foam film thickness is small, and the performance is excellent; dioctyl methyl hydroxysulfopropyl betaine is a core component producing the above excellent effects; the perfluorooctyl sodium sulfonate can effectively reduce the surface tension of the product and further improve the foaming efficiency of the product; the polyethylene glycol 6000 is mainly used for improving the structural strength of the foam film and reducing the fluid resistance of the foam; therefore, the foam water content of the foam scrubbing agent is lower through the dioctyl methyl hydroxy sulfopropyl betaine, the perfluorooctyl sodium sulfonate, the polyethylene glycol 6000 and the water.
Drawings
FIG. 1 is a structural formula of dioctylmethylhydroxysulfopropylbetaine preferably used in the present invention.
Detailed Description
The present invention is further illustrated below with reference to specific examples.
Example 1
A foam scrubbing agent with low foam water content is composed of the following components in percentage by weight: 35% of dioctyl methyl hydroxy sulfopropyl betaine, 1% of perfluorooctyl sodium sulfonate, 60004% of polyethylene glycol and 60% of water.
The preparation method comprises the following steps: adding 35 wt% of dioctyl methyl hydroxy sulfopropyl betaine and 60 wt% of water into a reaction container, stirring uniformly at constant temperature, adding 4 wt% of polyethylene glycol 6000, and reacting for 0.5 h; and adding 1 percent of perfluorooctyl sodium sulfonate by weight percentage, and continuously stirring for 15min to obtain the foam scrubbing agent with low foam water content.
Example 2
A foam scrubbing agent with low foam water content is composed of the following components in percentage by weight: 38% of dioctyl methyl hydroxy sulfopropyl betaine, 0.3% of perfluorooctyl sodium sulfonate, 60002% of polyethylene glycol and 59.7% of water. The structural formula of the dioctyl methyl hydroxy sulfopropyl betaine is shown in figure 1.
A preparation method of a foam scrubbing agent with low foam water content comprises the following steps: stirring and uniformly mixing 38 weight percent of dioctyl methyl hydroxy sulfopropyl betaine and 59.7 weight percent of water in a reaction vessel at constant temperature, and then adding 2 weight percent of polyethylene glycol 6000 to react for 2 hours; and adding 0.3 percent of perfluorooctyl sodium sulfonate by weight percent, and continuously stirring for 40min to obtain the foam scrubbing agent with low foam water content.
Example 3
A foam scrubbing agent with low foam water content is composed of the following components in percentage by weight: dioctyl methyl hydroxy sulfopropyl betaine 40%, perfluorooctyl sodium sulfonate 0.4%, polyethylene glycol 60001% and water 58.6%.
A preparation method of a foam scrubbing agent with low foam water content comprises the following steps: adding 40 wt% of dioctyl methyl hydroxy sulfopropyl betaine and 58.6 wt% of water into a reaction container, stirring and uniformly mixing at constant temperature of 50 ℃, and then adding 1 wt% of polyethylene glycol 6000 to react for 1 h; and adding 0.4 percent of perfluorooctyl sodium sulfonate by weight percent, and continuously stirring for 30min to obtain the foam scrubbing agent with low foam water content.
Example 4
A foam scrubbing agent with low foam water content is composed of the following components in percentage by weight: 36% of dioctyl methyl hydroxy sulfopropyl betaine, 0.1% of perfluorooctyl sodium sulfonate, 60004% of polyethylene glycol and 59.9% of water; the octyl group of the sodium perfluorooctyl sulfonate is a linear octyl group.
A preparation method of a foam scrubbing agent with low foam water content comprises the following steps: adding 36 wt% of dioctyl methyl hydroxy sulfopropyl betaine and 59.9 wt% of water into a reaction container, stirring uniformly at constant temperature, adding 4 wt% of polyethylene glycol 6000, and reacting for 2 h; and adding 0.1 percent of perfluorooctyl sodium sulfonate by weight percent, and continuously stirring for 40min to obtain the foam scrubbing agent with low foam water content.
Example 5
A foam scrubbing agent with low foam water content is composed of the following components in percentage by weight: 36.5 percent of dioctyl methyl hydroxy sulfopropyl betaine, 0.5 percent of perfluorooctyl sodium sulfonate, 60003 percent of polyethylene glycol and 60 percent of water; the octyl group of the sodium perfluorooctyl sulfonate is a linear octyl group.
A preparation method of a foam scrubbing agent with low foam water content comprises the following steps: adding 36.5 wt% of dioctyl methyl hydroxy sulfopropyl betaine and 60 wt% of water into a reaction container, stirring and uniformly mixing at constant temperature of 50 ℃, and then adding 3 wt% of polyethylene glycol 6000 to react for 1 h; and adding 0.5 percent by weight of perfluorooctyl sodium sulfonate, and continuously stirring for 30min to obtain the foam scrubbing agent with low foam water content.
Example 6
A foam scrubbing agent with low foam water content is composed of the following components in percentage by weight: 38% of dioctyl methyl hydroxy sulfopropyl betaine, 0.3% of perfluorooctyl sodium sulfonate, 60003% of polyethylene glycol and 58.7% of water; the octyl group of the sodium perfluorooctyl sulfonate is a linear octyl group.
A preparation method of a foam scrubbing agent with low foam water content comprises the following steps: adding 38 wt% of dioctyl methyl hydroxy sulfopropyl betaine and 58.7 wt% of water into a reaction container, stirring and uniformly mixing at constant temperature of 50 ℃, and then adding 3 wt% of polyethylene glycol 6000 to react for 2 h; and adding 0.3 mass percent of perfluorooctyl sodium sulfonate, and continuously stirring for 30min to obtain the foam scrubbing agent with low foam water content.
Example 7
A foam scrubbing agent with low foam water content is composed of the following components in percentage by weight: 40% of dioctyl methyl hydroxy sulfopropyl betaine, 1% of perfluorooctyl sodium sulfonate, 60004% of polyethylene glycol and 55% of water; the octyl group of the sodium perfluorooctyl sulfonate is a linear octyl group.
A preparation method of a foam scrubbing agent with low foam water content comprises the following steps: adding 40% by weight of dioctyl methyl hydroxy sulfopropyl betaine and 55% by weight of water into a reaction container, stirring and uniformly mixing at constant temperature of 50 ℃, and then adding 4% by weight of polyethylene glycol 6000 to react for 2 h; and adding 1% of perfluorooctyl sodium sulfonate by mass fraction, and continuously stirring for 30min to obtain the foam scrubbing agent with low foam water content.
Example 8
A foam scrubbing agent with low foam water content is composed of the following components in percentage by weight: 39% of dioctyl methyl hydroxy sulfopropyl betaine, 1% of perfluorooctyl sodium sulfonate, 60004% of polyethylene glycol and 56% of water; the octyl group of the sodium perfluorooctyl sulfonate is a linear octyl group.
A preparation method of a foam scrubbing agent with low foam water content comprises the following steps: adding 39 weight percent of dioctyl methyl hydroxy sulfopropyl betaine and 56 weight percent of water into a reaction container, stirring and uniformly mixing at constant temperature of 50 ℃, and then adding 4 weight percent of polyethylene glycol 6000 to react for 2 hours; and adding 1% of perfluorooctyl sodium sulfonate by mass fraction, and continuously stirring for 30min to obtain the foam scrubbing agent with low foam water content.
Verification example
The low-foam water content foam-discharging agent of the present invention used in this test example was prepared in example 2.
1) Measurement of foaming Effect
Mineralization of water: the mineralized water contains 40g/L of sodium chloride, 8g/L of calcium chloride and 2g/L of magnesium chloride. The product is prepared into 0.5 percent aqueous solution with mineralized water; taking 250ml of prepared aqueous solution, performing a Roche foam test at 80 ℃ under normal pressure, and measuring the foaming height and the 10min foaming height; the foam-discharging agent measured at the same time also comprises foaming agents with the corresponding models of Chengduayang Xinghua chemical company Limited, XHY-2 foaming agents and XHY-4A foaming agents. The results of the measurements are shown in Table 1 below.
TABLE 1
| Type of product | The invention relates to a foam discharging agent with low foam water content | XHY-2 foaming agent | XHY-4A foaming agent |
| Height of foaming, mm | 171 | 165 | 170 |
| Height of bubble of mm for 10min | 168 | 112 | 78 |
2) Determination of moisture content of foam
Mineralization of water: the mineralized water contains 40g/L of sodium chloride, 8g/L of calcium chloride and 2g/L of magnesium chloride. The product is prepared into 0.5 percent aqueous solution with mineralized water; taking 250ml of prepared water solution, and measuring the water content of the foam at 80 ℃ under normal pressure, wherein the specific measuring method comprises the following steps: closing the cock at the lower end of the Roche foam instrument, pouring the solution into the Roche foam instrument, connecting a liquid collecting pipe, connecting the liquid collecting pipe to a measuring cup of 2L, introducing nitrogen gas flow of 3L/min for foaming, stopping collecting foam when the foam reaches the scale of 2L, sealing the measuring cup, measuring the volume of the liquid after the foam is naturally broken, wherein the ratio of the volume of the liquid to the measuring cup is the water content of the foam; the foam-discharging agent measured at the same time also comprises foaming agents with the corresponding models of Chengduayang Xinghua chemical company Limited, XHY-2 foaming agents and XHY-4A foaming agents. The results of the measurements are shown in Table 2 below.
TABLE 2
| Type of product | The invention relates to a foam discharging agent with low foam water content | XHY-2 foaming agent | XHY-4A foaming agent |
| Water content of foam | 0.68％ | 1.36％ | 1.45％ |
3) Minimum foam film thickness
The foam minimum film thickness is defined as the film thickness when the foam produced under certain conditions naturally collapses. Mineralization of water: the mineralized water contains 40g/L of sodium chloride, 8g/L of calcium chloride and 2g/L of magnesium chloride. The product is prepared into 0.5 percent aqueous solution with mineralized water; by using the method for measuring the water content of the foam, the foam at the upper part 1/2 of the remaining foam when the foam is half broken is collected and observed under an electron microscope and measured, and the film thickness of three observable thicknesses is averaged to obtain the data as shown in the following table 3. The foam-discharging agent measured at the same time also comprises foaming agents with the corresponding models of Chengduayang Xinghua chemical company Limited, XHY-2 foaming agents and XHY-4A foaming agents.
TABLE 3
In conclusion, the foam scrubbing agent is superior to the prior art in three aspects of foaming effect, foam water content and minimum foam film thickness; therefore, the foam scrubbing agent has the characteristics of good foam stabilizing effect, low foam water content, small minimum foam film thickness and excellent performance.
The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (8)
1. The foam scrubbing agent with low foam water content is characterized in that: the composite material comprises the following components in percentage by weight: 35 to 40 percent of dioctyl methyl hydroxy sulfopropyl betaine, 0.1 to 1 percent of perfluorooctyl sodium sulfonate, 01 to 4 percent of polyethylene glycol 600and 55 to 60 percent of water;
the preparation method of the foam scrubbing agent comprises the following steps: stirring and uniformly mixing dioctyl methyl hydroxy sulfopropyl betaine and water in a reaction container at constant temperature, and then adding polyethylene glycol 6000 to react for 0.5-2 h; and adding the sodium perfluorooctyl sulfonate, and continuously stirring for 15-40min to obtain the foam scrubbing agent with low foam water content.
2. The foam discharging agent with low foam water content as claimed in claim 1, wherein: the octyl group of the sodium perfluorooctyl sulfonate is a linear octyl group.
3. The foam discharging agent with low foam water content as claimed in claim 2, wherein: the structural formula of the dioctyl methyl hydroxy sulfopropyl betaine is as follows:
4. the foam discharging agent with low foam water content as claimed in any one of claims 1 to 3, wherein: the composite material comprises the following components in percentage by weight: 36 to 39 percent of dioctyl methyl hydroxy sulfopropyl betaine, 0.3 to 1 percent of perfluorooctyl sodium sulfonate, 60002 to 4 percent of polyethylene glycol and 56 to 60 percent of water.
5. A method for preparing the foam discharging agent with low foam water content according to any one of claims 1 to 4, which is characterized in that: the method comprises the following steps: stirring and uniformly mixing dioctyl methyl hydroxy sulfopropyl betaine and water in a reaction container at constant temperature, and then adding polyethylene glycol 6000 to react for 0.5-2 h; and adding the sodium perfluorooctyl sulfonate, and continuously stirring for 15-40min to obtain the foam scrubbing agent with low foam water content.
6. The method for preparing the foam discharging agent with low foam water content as claimed in claim 5, wherein the method comprises the following steps: the constant temperature is 50 ℃.
7. The method for preparing the foam discharging agent with low foam water content as claimed in claim 5, wherein the method comprises the following steps: adding polyethylene glycol 6000 for reaction for 1 hr.
8. The method for preparing the foam discharging agent with low foam water content as claimed in claim 5, wherein the method comprises the following steps: the perfluorooctyl sodium sulfonate is added and the stirring is continued for 30 min.
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