CN117304907A - A kind of gas well bubble drainage agent and its preparation and application - Google Patents

Abstract

The invention relates to a gas well foam discharging agent which comprises the following components in parts by weight: 5-10% of ammonium oxide surfactant; 5% -10% of betaine surfactant; 1 to 5 percent of lauryl glycol sodium carboxylate; 0.2 to 1 percent of alpha-olefin sodium sulfonate; sodium chloride 0.5-1%; the balance of water. Compared with the prior art, the gas well foam discharging agent has high-efficiency foaming capacity and good acid and alkali resistance; the self low surface tension greatly improves the emulsifying property of the product of the same type and the oil-coagulating and oil-separating capacity.

Description

A kind of gas well bubble drainage agent and its preparation and application

Technical field

The invention relates to the technical field of natural gas extraction, and specifically relates to a gas well bubble drainage agent and its preparation and application.

Background technique

The foam drainage gas production process is to inject the foaming agent into the wellbore, mix it with the wellbore liquid, and use the agitation of the natural gas flow to generate a large amount of low-density water-containing foam, which reduces the density of the liquid and reduces the "slip" loss of the liquid as it moves up the tubing wall. Improve the vertical lifting capacity of the air flow to achieve the purpose of draining the wellbore fluid. The common method is to add a foaming and discharging agent to the water. At this time, the surface tension of the water decreases rapidly as the surfactant concentration increases. The rate of decrease in surface tension reflects the efficiency of the foaming and discharging agent. The mechanism of gas recovery through foam drainage includes foam effect, dispersion effect, drag reduction effect and washing effect.

Most of the existing foaming and discharging agents add anionic surfactants, which have high surface tension, poor degradability, and poor foam stabilizing performance, resulting in poor liquid carrying capacity and low mining efficiency.

Contents of the invention

The purpose of the present invention is to provide an air well foaming and drainage agent to overcome the above-mentioned defects in the prior art.

The purpose of this application is also to provide the preparation and application of the above-mentioned air well foaming and drainage agent.

In order to achieve the purpose of the present invention, this application provides the following technical solutions.

In a first aspect, the present application provides an air well bubble and discharge agent, which includes the following components by weight:

In an embodiment of the first aspect, the ammonium oxide surfactant is cocamidopropyl ammonium oxide.

In an embodiment of the first aspect, the betaine surfactant is cocamidopropyl betaine.

In a second aspect, this application also provides a method for preparing the air well bubble drainage agent as described above, which method includes the following steps:

The ammonium oxide surfactant, the betaine surfactant, the nonionic surfactant, the α-olefin sodium sulfonate and the sodium chloride are placed in the water in sequence, using A stirring device or an ultrasonic device is used to dissolve and mix the mixture evenly to obtain the air well bubble and discharge agent.

In a third aspect, the present application also provides an application of the above-mentioned gas well bubble and drainage agent, which is used for drainage and gas production treatment of natural gas wells.

Compared with the prior art, the beneficial effects of the present invention are:

The bubble and discharge agent produced by the present application has good foam stability when used, has a large liquid carrying capacity, and the surface tension of the bubble and discharge agent is small. Even when the condensate oil content is high during mining, it can Exhibits superior foaming ability; thus improving mining efficiency.

Detailed ways

Unless otherwise stated, implied from the context, or customary in the art, all parts and percentages in this application are based on weight, and the testing and characterization methods used are current as of the filing date of this application. Where applicable, the contents of any patents, patent applications or publications referred to in this application are hereby incorporated by reference in their entirety, and their equivalent patent families are also incorporated by reference, particularly those documents that disclose relevant information in the field. Definition of synthesis techniques, product and process design, polymers, comonomers, initiators or catalysts, etc. If the definition of a specific term disclosed in the prior art is inconsistent with any definition provided in this application, the definition of the term provided in this application shall control.

Numerical ranges in this application are approximations and therefore may include values outside the range unless otherwise stated. The range of values includes all values from the lower value to the upper value in 1-unit increments, provided there is a gap of at least 2 units between any lower value and any higher value. For example, if a composition, physical or other property (such as molecular weight, etc.) is stated as 100 to 1000, it means that all single values are explicitly listed, such as 100, 101, 102, etc., as well as all sub-ranges, such as 100 to 166, 155 to 170, 198 to 200 etc. For ranges that contain values less than 1 or that contain fractions greater than 1 (such as 1.1, 1.5, etc.), then 1 unit is treated as 0.0001, 0.001, 0.01, or 0.1, appropriately. For ranges containing single digit numbers less than 10 (such as 1 to 5), 1 unit is usually considered to be 0.1. These are merely specific examples of what is intended, and all possible combinations of values between the lowest and highest values recited are deemed to be expressly stated in this application. It should also be pointed out that the terms "first", "second", etc. in this article do not limit the order, but are only used to distinguish substances with different structures.

When used with respect to a chemical compound, the singular includes all isomeric forms and vice versa unless expressly stated otherwise (eg, "hexane" individually or collectively includes all isomers of hexane). In addition, unless expressly stated otherwise, nouns described by "a", "an" or "the" also include the plural form.

The terms "comprising", "including", "having" and their derivatives do not exclude the presence of any other components, steps or processes and are independent of whether these other components, steps or processes are disclosed in this application. To eliminate any doubt, all compositions using the terms "comprising", "including", or "having" in this application may contain any additional additives, excipients or compounds unless expressly stated otherwise. In contrast, the term "consisting essentially of" excludes from the scope of any subsequent recitation of that term any other components, steps or processes other than those necessary for operating performance. The term "consisting of" does not include any component, step or process not specifically described or listed. Unless expressly stated otherwise, the term "or" refers to the listed members individually or to any combination thereof.

traditional.

The purpose of this application is to provide an air well bubble and discharge agent, which includes the following components by weight:

A foaming and discharging agent composed of ammonium oxide surfactant, betaine surfactant, and sodium lauryl glycol carboxylate; sodium lauryl glycol carboxylate has both anionic and nonionic hydrophilic groups. Group; In the present invention, amine oxide anionic surfactants and betaine zwitterionic surfactants are used in combination with them, which can better improve the compatibility between surfactant types in bubble extrusion and improve the solubility with water. Laurel The unique two hydrophilic groups of sodium glycol carboxylate enable the foam-expelled system to exert its multi-faceted properties and still have strong foaming power under acidic conditions.

In an embodiment of the first aspect, the ammonium oxide surfactant is cocamidopropyl ammonium oxide.

In an embodiment of the first aspect, the betaine surfactant is cocamidopropyl betaine.

In a second aspect, this application also provides a method for preparing the air well bubble drainage agent as described above, which method includes the following steps:

The ammonium oxide surfactant, the betaine surfactant, the sodium lauryl glycol carboxylate, the α-olefin sodium sulfonate and the sodium chloride are placed in the water in sequence, Use a stirring device or an ultrasonic device to dissolve and mix it evenly to obtain the air well bubble and discharge agent.

In a third aspect, the present application also provides an application of the above-mentioned gas well bubble and drainage agent, which is used for drainage and gas production treatment of natural gas wells.

Example

The embodiments of the present invention will be described in detail below. This embodiment is implemented based on the technical solution of the present invention and provides detailed implementation modes and specific operating processes. However, the protection scope of the present invention is not limited to the following. Example.

Example 1

An air well foaming and draining agent, the preparation method of which is as follows: 5.5 parts by weight of cocamidopropyl ammonium oxide, 6 parts by weight of cocamidopropyl betaine, 1.5 parts by weight of sodium lauryl glycol carboxylate, 0.35 parts by weight of α - Sodium olefin sulfonate and 1.15 parts by weight of sodium chloride were placed in 85.5 parts of deionized water in sequence, and mixed evenly with ultrasonic to obtain the A1 foaming and discharging agent.

Example 2

An air well foaming and draining agent, the preparation method of which is as follows: 4.0 parts by weight of cocamidopropyl ammonium oxide, 7.5 parts by weight of cocamidopropyl betaine, 1.0 parts by weight of sodium lauryl glycol carboxylate, 0.5 parts by weight of α - Sodium olefin sulfonate and 1.0 parts by weight of sodium chloride were placed in 86 parts of deionized water in sequence, and mixed evenly by ultrasonic to obtain the A2 foaming and discharging agent.

Example 3

An air well foaming and draining agent, the preparation method of which is as follows: 7.0 parts by weight of cocamidopropyl ammonium oxide, 4.5 parts by weight of cocamidopropyl betaine, 2.0 parts by weight of sodium lauryl glycol carboxylate, 0.2 parts by weight of α - Sodium olefin sulfonate and 1.3 parts by weight of sodium chloride were placed in 86 parts of deionized water in sequence, and mixed evenly with ultrasonic to obtain the A3 foaming and discharging agent.

Example 4

An air well foaming and draining agent, the preparation method of which is as follows: 5.0 parts by weight of cocamidopropyl ammonium oxide, 5.5 parts by weight of cocamidopropyl betaine, 1.7 parts by weight of sodium lauryl glycol carboxylate, 0.3 parts by weight of α - Sodium olefin sulfonate and 1.2 parts by weight of sodium chloride were placed in 86.3 parts of deionized water in sequence, and mixed evenly with ultrasonic to obtain A4 foaming and discharging agent.

Example 5

An air well soaking and draining agent, the preparation method of which is as follows: 6.0 parts by weight of cocamidopropyl ammonium oxide, 6.0 parts by weight of cocamidopropyl betaine, 1.4 parts by weight of sodium lauryl glycol carboxylate, 0.4 parts by weight of α - Sodium olefin sulfonate and 1.1 parts by weight of sodium chloride were placed in 85.1 parts of deionized water in sequence, and mixed evenly with ultrasonic to obtain the A5 foaming and discharging agent.

Comparative example 1

A gas well bubble drainage agent, the preparation method of which is as follows: 7.0 parts by weight of cocamidopropyl ammonium oxide, 6.0 parts by weight of cocamidopropyl betaine, 0.35 parts by weight of α-olefin sodium sulfonate and 1.15 parts by weight of chlorine The sodium was placed in 85.5 parts of deionized water in sequence, and mixed evenly with ultrasonic to obtain the B1 bubble and discharge agent.

Comparative example 2

A gas well foaming and draining agent, the preparation method of which is as follows: 5.5 parts by weight of cocamidopropyl ammonium oxide, 6 parts by weight of cocamidopropyl betaine, 1.5 parts by weight of sodium dodecylbenzene sulfonate, 0.35 parts by weight Sodium α-olefin sulfonate and 1.15 parts by weight of sodium chloride were placed in 85.5 parts of deionized water in sequence, and mixed evenly with ultrasonic to obtain a B2 foaming and discharging agent.

Comparative example 3

An air well bubble drainage agent, the preparation method of which is as follows: add 5.5 parts by weight of lauryl amidopropyl ammonium oxide, 6 parts by weight of dodecyl aminopropionic acid, 1.5 parts by weight of sodium lauryl glycol carboxylate, 0.35 parts by weight of α- Sodium olefin sulfonate and 1.15 parts by weight of sodium chloride were placed in 85.5 parts of deionized water in sequence, and mixed evenly with ultrasonic to obtain a B3 foaming and discharging agent.

Comparative example 4

Purchase a commercially available foam drainage agent, the model is SS-127, the manufacturer is Xinxiang xx Biotechnology Co., Ltd., as a B4 foam drainage agent.

Effect Example

A total of 9 parts of the foaming agents A1 to A5 and B1 to B4 were subjected to a foaming test to test the foam height. The results are shown in Table 1.

Table 1 Foam height test results of various foaming and discharging agents at different pH values

pH 5 6 7 8 9 10 A1 350 360 380 390 380 390 A2 280 290 300 320 320 330 A3 430 450 480 490 500 480 A4 290 290 300 310 310 320 A5 320 350 350 380 360 370 B1 200 220 230 240 240 230 B2 190 200 220 230 240 230 B3 220 240 260 270 280 270 B4 160 190 200 230 220 230

A total of 9 soaking and discharging agents, A1 to A5 and B1 to B4, were tested for liquid carrying capacity. The results are shown in Table 2.

Table 2 Test results of liquid carrying capacity of each foaming and discharging agent

Group Liquid carrying capacity (mL/15min) A1 300 A2 275 A3 401 A4 270 A5 295 B1 191 B2 213 B3 215 B4 166

A total of 9 parts of the foaming and discharging agents A1 to A5 and B1 to B4 were tested for surface tension. A 0.1% sample solution was prepared with distilled water and the surface tension was measured in the YW-200B automatic interfacial tension meter. The results are shown in Table 3.

Table 3 Surface tension test results of each foaming and discharging agent

Group Surface tension (mN/m) A1 8.96 A2 10.32 A3 5.96 A4 7.96 A5 9.12 B1 29.47 B2 30.2 B3 23.5 B4 35.57

From the above three sets of test data, we can draw the following conclusions:

(1) The foaming agent has a higher foam height in an alkaline environment, especially when the pH is 8 to 10, the foam height is the highest. And compared with the foaming and discharging agents prepared in Examples 1 to 5, the foaming and discharging agents prepared in Comparative Examples 1 to 4 have higher foam heights at each pH value, that is, the stability of the foam is better.

(2) Compared with the foaming and discharging agents prepared in Comparative Examples 1 to 4, the foaming and discharging agents prepared in Examples 1 to 5 have a larger liquid carrying capacity and are more advantageous for natural gas exploitation.

(3) The foaming and discharging agents prepared in Examples 1 to 5 have smaller surface tensions, and those skilled in the art know that the smaller the surface tension of the foaming and discharging agents, the better the performance of the foaming and discharging agents during mining, even when the condensate oil content is high. It can also show superior foaming ability at low temperatures, thereby improving mining efficiency.

Finally, to examine the compatibility of the foaming and discharging agents of this application in practical applications, A1 to A5 foaming and discharging agents were taken, and the gas well formation water was used to prepare aqueous solutions with mass concentrations of 0.1%, 0.3%, 0.5%, 0.7%, and 0.9%. Then divide the aqueous solution of each concentration into 4 parts and place them at -15°C, 0°C, 25°C, and 50°C at constant temperature for 48 hours, and finally return to room temperature. As a result, all aqueous solutions were clear and transparent, with no precipitation or stratification, indicating that the soaking and expulsion agent of the present application has good compatibility.

The above description of the embodiments is to facilitate those of ordinary skill in the art to understand and apply the present application. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without inventive efforts. Therefore, this application is not limited to the embodiments here. Improvements and modifications made by those skilled in the art based on the contents disclosed in this application without departing from the scope and spirit of this application are all within the scope of this application.

Claims (5)

1. The gas well foam discharging agent is characterized by comprising the following components in parts by weight:

2. the gas well foam discharging agent according to claim 1, wherein said ammonium oxide-based surfactant is cocamidopropyl ammonium oxide.

3. The gas well foam discharging agent according to claim 1, wherein said betaine-type surfactant is cocamidopropyl betaine.

4. A method of preparing a gas well foam-displacement agent as claimed in any one of claims 1 to 3, comprising the steps of:

and (3) sequentially placing the ammonium oxide surfactant, the betaine surfactant, the sodium lauryl glycolate, the alpha-olefin sodium sulfonate and the sodium chloride in water according to a proportion, stirring or carrying out ultrasonic treatment to dissolve and uniformly mix the materials, thus obtaining the gas well foam discharging agent.

5. Use of a gas well foam drainage agent according to any one of claims 1 to 3 for drainage and gas production treatment of a natural gas well.