A triazine multi-effect intelligent foaming agent and preparation method thereof

Abstract

The present invention relates to the technical field of foam drainage and gas production, and discloses a triazine multi-effect intelligent foaming agent and a preparation method thereof. In parts by mass, the triazine multi-effect intelligent foaming agent comprises 1 to 50 parts of a triazine multi-effect intelligent foaming agent, 1 to 50 parts of anionic surfactant, and 500 to 1000 parts of water. The triazine multi-effect intelligent foaming agent uses cyanuric chloride as a grafting monomer, and gradually grafts functional functional groups thereon by adjusting the temperature, thereby achieving the purpose of one dose with multiple effects. The foaming agent can produce high foaming and high stable foam at high temperature at the bottom of the well, and low foaming and low stable foam at low temperature at the wellhead, and has good sterilization and corrosion inhibition effects.

Description

Technical Field

[0001] The invention relates to the technical field of foam drainage and gas production, and in particular to a triazine multi-effect intelligent foam drainage agent and a preparation method thereof. Background Art

[0002] In the process of gas field development, the treatment of liquid accumulation at the bottom of gas wells has always been an important technical issue. Foam drainage gas production technology has been widely used in natural gas production due to its advantages such as simple equipment, easy construction and quick effect. The cost of this process in the application process is mainly concentrated in the reagents. If the cost of reagents can be further reduced, it will be of great significance for the exploitation of normal pressure and low pressure gas wells. At present, most foam drainage agents on the market have deficiencies in temperature resistance, salt resistance, oil resistance and other properties. Although some high-performance agents have been successful under laboratory conditions, due to their complex preparation process and high cost, it is difficult to achieve large-scale application under high temperature, high salt and condensate-rich gas field conditions. In addition, the corrosion problem in the wellbore of the gas well also puts forward high requirements on the compatibility of foam drainage agents and corrosion inhibitors.

[0003] Therefore, the industry urgently needs a foaming agent with excellent performance and economical price to solve the shortcomings of existing products. In response to this demand, this patent proposes a new triazine multi-effect intelligent foaming agent and its preparation method. The foaming agent not only has excellent heat resistance, salt resistance, oil resistance, as well as bactericidal and corrosion inhibition capabilities, but also can achieve high foaming and high stable foam under high temperature conditions at the bottom of the well, and at the same time exhibit low foaming and low stable foam characteristics under low temperature conditions at the wellhead. The introduction of this technology can not only meet the strict requirements of the site for the foaming agent to have multiple effects in one dose and reduce the amount of defoaming agent used, but also greatly improve the efficiency of gas field development and promote the popularization and application of foam drainage and gas production technology. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a triazine multi-effect intelligent foaming agent and a preparation method thereof, utilize the characteristics of cyanuric chloride graded reaction, graft functional groups at different temperatures to prepare triazine multi-effect intelligent foaming agent, and then compound with low-cost anionic surfactant to reduce the cost of the agent. The foaming agent not only has temperature resistance, salt resistance, oil resistance and excellent sterilization and corrosion inhibition properties, but also has the characteristics of high foaming and high stable foaming under high temperature conditions at the bottom of the well, and low foaming and low stable foaming under low temperature conditions at the wellhead.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A triazine multi-effect intelligent foaming agent and a preparation method thereof, comprising the following components by weight: 1 to 50 parts of a triazine multi-effect intelligent foaming agent, 1 to 50 parts of an anionic surfactant, and 500 to 1000 parts of water;

[0007] The preparation steps of the triazine multi-effect intelligent foaming agent are as follows:

[0008] Step 1: Place a three-necked flask in an ice water bath at 0-4°C, add an organic solvent solution of cyanuric chloride, add polyoxyethylene alkyl ether, stir, add 20% sodium carbonate solution as an acid binding agent, and react for 6-10 hours;

[0009] Step 2: Continue heating the product obtained in step 1 to 35-50° C., add a linear diamine, add sodium hydroxide to adjust the pH value to 7-8, and react for 6-10 hours;

[0010] Step 3: Continue heating the product obtained in step 2 to 85-95°C, add N,N-dimethyl-1,3-propylenediamine and react for 6-10 hours;

[0011] Step 4: Continue to keep the temperature of the product obtained in step 3 at 85-95°C, add sodium chloroacetate, and react for 6-10 hours;

[0012] Step 5: After the reaction is completed, filter, wash, and freeze-dry to obtain a triazine multi-effect intelligent foaming agent;

[0013] The molar fractions of the reactants in steps 1 to 4 are 0.55 to 1.1.

[0014] In a specific embodiment of the present scheme, the organic solvent in step 1 of preparing the triazine multi-effect intelligent foaming agent is toluene;

[0015] In a specific embodiment of the present scheme, the degree of polymerization of the polyoxyethylene alkyl ether in the preparation step 1 of the triazine multi-effect intelligent foaming agent is 23, and the alkyl chain length is 12;

[0016] In a specific embodiment of the present scheme, the linear diamine in step 2 of preparing the triazine multi-effect intelligent foaming agent is 1,3-propylenediamine;

[0017] In a specific embodiment of the present scheme, the anionic surfactant is a mixture of sodium dodecylbenzene sulfonate and sodium α-olefin sulfonate in a 1:1 ratio.

[0018] In a specific implementation of this scheme, the water is tap water or clean water from a water source well near a gas well.

[0019] On the other hand, the present invention also provides a preparation method for preparing a triazine multi-effect intelligent foaming agent, the steps of which are:

[0020] S1: Preparation of triazine multi-effect intelligent foaming agent;

[0021] S2: Stir all components evenly in a reaction kettle to obtain a triazine-based multi-effect intelligent foaming agent.

[0022] On the other hand, the present invention also provides a foam drainage and gas production technology, in which the foam drainage agent used in the gas well foam drainage and gas production process is a triazine-based multi-effect intelligent foam drainage agent suitable for high-temperature, high-salt, condensate oil and gas reservoirs, and the concentration of the added agent is 5%.

[0023] The beneficial effects of the present invention are:

[0024] (1) The triazine multi-effect intelligent foaming agent synthesized in this scheme is a triazine Gemini betaine surfactant, which has excellent heat resistance, salt resistance, oil resistance, acid and alkali resistance, and has the characteristics of low critical micelle concentration (CMC), high surface activity, good antistatic property, strong bactericidal property, good corrosion inhibition, and easy biodegradability;

[0025] (2) The triazine multi-effect intelligent foaming agent synthesized in this scheme introduces a polyoxyethylene alkyl ether group with temperature-sensitive properties, thereby giving the foaming agent temperature-sensitive properties. When the temperature is high underground, the triazine multi-effect intelligent foaming agent can effectively increase the viscosity of the system and enhance the stability of the foam; when the temperature is low at the wellhead, the viscosity of the system decreases and the foam stabilization performance decreases. Under the combined effect, it can effectively reduce the difficulty of defoaming ground equipment and reduce the amount of defoaming agent used;

[0026] (3) The triazine-based multi-effect intelligent foaming agent synthesized in this scheme has a simple synthesis method and the raw materials are cheap and easily available. The triazine-based multi-effect intelligent foaming agent obtained by compounding with anionic surfactants further reduces the cost of the agent. The multi-effect, intelligence and economy of the agent all meet the on-site requirements, simplifying the dosing steps of the foaming process, which can play a positive role in promoting the promotion of the foaming process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the structural formula diagram of triazine multi-effect intelligent foaming agent;

[0028] Figure 2 It is the foaming performance test chart of comparison group A and comparison group B;

[0029] Figure 3 It is the bactericidal performance test chart of comparison group A and comparison group B;

[0030] Figure 4 It is the corrosion inhibition performance test chart of comparison group A and comparison group B. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments, but the protection scope of the present invention is not limited to the following.

[0032] In the embodiment of this scheme, the preparation of triazine multi-effect intelligent foaming agent includes the following steps:

[0033] Step 1: Place a three-necked flask in an ice water bath at 0-4°C, add a toluene solution of cyanuric chloride, add polyoxyethylene alkyl ether, stir, add 20% sodium carbonate solution as an acid binding agent, and react for 8 hours;

[0034] Step 2: Continue heating the product obtained in step 1 to 35-50° C., add 1,3-propylenediamine, add sodium hydroxide to adjust the pH value to 7-8, and react for 6 hours;

[0035] Step 3: Continue heating the product obtained in step 2 to 85-95°C, add N,N-dimethyl-1,3-propylenediamine and react for 6 hours;

[0036] Step 4: Continue to keep the temperature of the product obtained in step 3 at 85-95°C, add sodium chloroacetate, and react for 6 hours;

[0037] Step 5: After the reaction is completed, filter, wash, and freeze-dry to obtain a triazine multi-effect intelligent foaming agent, the structural formula of which is as follows: Figure 1 shown.

[0038] The reaction equation in the preparation process is:

[0039]

[0040]

[0041] ;

[0042] Among them, n is 2~50.

[0043] The pharmaceutical agents used in the embodiments of the present invention are all commercially available products, and the product purity level is industrial pure. Example

[0044] A triazine multi-effect intelligent foaming agent and a preparation method thereof are composed of the following components in parts by mass: 30 parts of a triazine multi-effect intelligent foaming agent, 30 parts of sodium dodecylbenzene sulfonate, 30 parts of sodium α-olefin sulfonate, and 700 parts of water. Example

[0045] A triazine multi-effect intelligent foaming agent and a preparation method thereof are composed of the following components by weight: 20 parts of triazine multi-effect intelligent foaming agent, 15 parts of sodium dodecylbenzene sulfonate, 15 parts of sodium α-olefin sulfonate, and 1000 parts of on-site sewage.

[0046] The preparation methods of both Example 1 and Example 2 are as follows: the components are stirred evenly in a reaction kettle to obtain a triazine-based multi-effect intelligent foaming agent.

[0047] Comparative Example 1:

[0048] This comparative example uses an anionic surfactant solution before and after the addition of a triazine multi-effect intelligent foaming agent to conduct foaming height and stable foam height tests at different indoor temperatures.

[0049] Experimental steps: firstly, a foaming agent solution A was prepared according to the steps of Example 2, and the only difference from Example 2 was that the foaming agent solution did not contain a triazine multi-effect intelligent foaming agent; then, a foaming agent solution B was prepared according to the steps of Example 2; and then two test experiments of groups A and B were carried out using a 2151 Roche foam instrument;

[0050] Specifically, test groups A and B both conducted indoor foaming height and stable foam height tests on the foaming agent solution at 50°C and 90°C.

[0051] Test results such as Figure 2 As shown, at 50°C, the initial bubble height H0 of group A is 165mm, and the 5-minute foam height H5 is 155mm; the initial bubble height H0 of group B is 95mm, and the 5-minute foam height H5 is 35mm; at 90°C, the initial bubble height H0 of group A is 230mm, and the 5-minute foam height H5 is 75mm; the initial bubble height H0 of group B is 280mm, and the 5-minute foam height H5 is 135mm.

[0052] Therefore, from Figure 2 The comparison between Group A and Group B shows that:

[0053] (1) At 50°C, the initial foam height and the 5-minute foam height of group A were higher than those of group B, indicating that the addition of triazine-based multi-effect intelligent foaming agents can effectively inhibit the foaming performance of the foaming agent solution at low temperatures and reduce its foam stabilization performance.

[0054] (2) At 90°C, the initial foam height and the 5-minute foam height of group A were lower than those of group B, indicating that the addition of triazine multi-effect intelligent foaming agents can effectively improve the foaming performance and foam stabilization performance of the foaming agent solution at high temperatures.

[0055] Comparative Example 2:

[0056] The foaming agent solutions A and B prepared in Comparative Example 1 were subjected to a sterilization experiment according to the standard.

[0057] In the blank sample of the experiment, the SRB bacteria content was 2500 / mL, the FB bacteria content was 13000 / mL, and the TGB bacteria content was 12000 / mL. In the foaming agent solution sample of group A, the SRB bacteria content dropped to 2000 / mL, the FB bacteria content dropped to 10000 / mL, and the TGB bacteria content dropped to 11000 / mL. In the foaming agent solution sample of group B, the SRB bacteria content dropped to 0 / mL, the FB bacteria content dropped to 25 / mL, and the TGB bacteria content dropped to 60 / mL. Figure 3 As shown in the results, in the foaming agent solution samples of group A, the sterilization rate of SRB bacteria was 20%, the sterilization rate of FB bacteria was 23.08%, and the sterilization rate of TGB bacteria was 8.33%. In the foaming agent solution samples of group B, the sterilization rate of SRB bacteria was 100%, the sterilization rate of FB bacteria was 99.81%, and the sterilization rate of TGB bacteria was 99.50%. The bactericidal performance of the foaming agent solution after adding the triazine multi-effect intelligent foaming agent was significantly enhanced, indicating that the addition of the triazine multi-effect intelligent foaming agent can improve the bactericidal performance of the foaming agent solution.

[0058] Comparative Example 3:

[0059] The foaming agent solutions A and B prepared in Comparative Example 1 were subjected to corrosion inhibition experiments according to the standard.

[0060] The experimental results are as follows Figure 4 As shown, the corrosion inhibition rate of group A is 32.6%, and the corrosion inhibition rate of group B is 87.3%, indicating that the addition of triazine multi-effect intelligent foaming agent can improve the corrosion inhibition performance of the foaming agent solution.

[0061] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A triazine multi-effect intelligent foaming agent, characterized in that: The composition comprises the following components in parts by weight: 1 to 50 parts of triazine multi-effect intelligent foaming agent, 1 to 50 parts of anionic surfactant, and 500 to 1000 parts of water; The preparation steps of the triazine multi-effect intelligent foaming agent are as follows: Step 1: Place a three-necked flask in an ice water bath at 0-4°C, add an organic solvent solution of cyanuric chloride, add polyoxyethylene alkyl ether, stir, add 20% sodium carbonate solution as an acid binding agent, and react for 6-10 hours; Step 2: Continue heating the product obtained in step 1 to 35-50° C., add a linear diamine, add sodium hydroxide to adjust the pH value to 7-8, and react for 6-10 hours; Step 3: Continue heating the product obtained in step 2 to 85-95°C, add N,N-dimethyl-1,3-propylenediamine and react for 6-10 hours; Step 4: Continue to keep the temperature of the product obtained in step 3 at 85-95°C, add sodium chloroacetate, and react for 6-10 hours; Step 5: After the reaction is completed, filter, wash, and freeze-dry to obtain a triazine multi-effect intelligent foaming agent; The molar fractions of the reactants in steps 1 to 4 are 0.55 to 1.1; the polyoxyethylene alkyl ether is polyoxyethylene dodecyl ether having a degree of polymerization of 23; and the linear diamine is 1,3-propylenediamine.

2. The method for preparing the triazine multi-effect intelligent foaming agent according to claim 1, characterized in that: The specific steps include: S1: Preparation of triazine multi-effect intelligent foaming agent; S2: Stir all components evenly in a reaction kettle to obtain a triazine-based multi-effect intelligent foaming agent.

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