Silicin foam liquid and application thereof in foam drainage
By using silicone protein foam solution composed of plant proteolytic solution and silicon surfactant as gas well foam drainage agent, the problems of foam instability and insufficient liquid carrying capacity in the prior art under high temperature, high salt and high oil environments are solved, and the problem of foam unstable and insufficient liquid carrying capacity in high temperature, high salt and high oil environments is achieved. More efficient gas well production and wellbore liquid discharge.
Patent Information
- Application Number
- CN202411694380.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-02-21
AI Technical Summary
The existing gas well foam drainage agent is difficult to maintain stable performance in high temperature, high salt and high oil environments, resulting in unstable foam and insufficient liquid carrying capacity, which affects the gas well production and the effective discharge of the wellbore liquid.
Silicone protein foam liquid composed of plant proteolytic solution, silicon surfactant and water is used as the bubble drainage agent. Through excellent high-temperature stability, foam performance and liquid carrying ability, it adapts to high-temperature, high-salt and high-oil environments.
Silicone protein foam liquid maintains stable performance under high temperature environments, forming stable and low-appearance density foam, significantly improving the liquid carrying volume and foam stability, effectively improving the gas well output and the discharge efficiency of wellbore liquid.
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Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of gas well foam drainage agents, and in particular relates to a silica protein foam liquid and application thereof in foam drainage. Background Art
[0002] Natural gas is an important fossil energy source and has important applications in production and life. At the beginning of gas well exploitation, natural gas automatically sprays out of the gas layer under the action of bottom pressure. As the gas well exploitation time increases, the formation pressure decreases, the natural gas flow rate decreases, the liquid carrying capacity decreases, and the water and condensate associated with natural gas accumulate in the wellbore, which seriously threatens the stable production of the gas well, resulting in a decrease in gas production or even a shutdown.
[0003] In order to cope with the above difficulties, researchers have developed foam drainage technology to increase gas well production and reduce the accumulation of liquid in the wellbore. The basic principle of foam drainage technology is: foam drainage agent is added from the wellhead, flows into the bottom of the well under the action of gravity, and turns into light foam under the stirring of natural gas flow, and rises to the ground with the air flow and is discharged. The harsh working environment puts forward higher performance requirements for foam drainage agents: (1) High temperature stability: The formation temperature (50-150°C) is much higher than the ground temperature, which requires the foaming agent to maintain stable performance at high temperatures without hydrolysis or degradation; (2) Low surface tension: Due to the high mineralization of water in gas wells and the presence of condensate oil, the foaming agent should have a low surface tension in order to form a stable foam with low apparent density; (3) High foaming ability: Due to the high mineralization of water in gas wells and the presence of condensate oil, the foaming agent is required to have excellent foaming ability in order to achieve stable foaming in a high-salt and high-oil environment; (4) High liquid carrying capacity: The foaming agent is required to maintain stable foam in a high temperature, high salt, and high oil environment and be able to stably carry the liquid out of the wellbore; (5) Economy: The cost of the foaming agent should be low and the concentration used should be as low as possible.
[0004] There is no effective solution to the above problems.
[0005] The present invention proposes for the first time a silica protein foam liquid and its application in foam drainage, which can effectively solve the problems existing in gas well foam drainage.
[0006] The silicon protein foam liquid of the present invention is composed of plant protein hydrolyzate, silicon surfactant and water, and has excellent high temperature stability, foam performance, liquid carrying and water retention capacity. The silicon protein foam liquid of the present invention has a good application effect in the field of foam drainage. Summary of the invention
[0007] The invention provides a silicone protein foam liquid and application thereof in foam drainage.
[0008] The silicon protein foam liquid proposed by the present invention is composed of plant protein hydrolysate, silicon surfactant and water in a mass ratio of 3-5:1-2:15-20. The mass fraction of plant protein hydrolysate in the plant protein hydrolysate is 35-40%, and the plant protein is one of soybean protein, rapeseed protein or sunflower seed protein; the structure of the silicon surfactant is one of [(CH3)3SiO]2-Si(CH3)-(CH2)3-(OCH2CH2)n-OH and (CH3)3SiO-[Si(CH3)-(CH2)3-(OCH2CH2)n-OH]2-OSi(CH3)3, wherein n = 8-20.
[0009] Preparation method of plant protein hydrolyzate: crush plant seed cake (soybean cake, rapeseed cake or sunflower seed cake), sieve to obtain seed cake powder with a particle size of 0.1 to 0.5 mm. Add castor seed cake powder into a reactor, add water and stir to mix; add 0.5-1% sodium hydroxide by weight of seed cake and 0.02-0.2% calcium hydroxide by weight of seed cake in sequence. Heat to 70 to 90 ℃ at normal pressure, react for 4 to 8 hours, cool to obtain a mixed solution. Filter the mixed solution at normal pressure and collect the filtrate. Place the filtrate in a reactor, stir and heat to 30 to 50 ℃, add a deodorant, heat to 60 to 80 ℃ and keep warm for 30 minutes, cool and stand, filter at normal pressure, and collect the filtrate. The filtrate is placed in a reactor, stirred at room temperature, and aminosulfonic acid is added until the pH value of the filtrate reaches 7.0-8.0. The neutralized filtrate is heated to 90-99°C to evaporate the water, and the temperature is kept for 4 to 10 hours to concentrate to obtain a plant protein hydrolyzate with a mass fraction of 35-40% of the plant protein hydrolyzate.
[0010] Silicone protein foam liquid is made of plant protein hydrolyzate, silicon surfactant and water in a mass ratio of 3-5:1:15-20. The performance test of silicon protein foam liquid as a foaming agent is carried out in accordance with the petroleum and natural gas industry standards of the People's Republic of China "SY / T 5761-1995 Foaming Agent for Drainage and Gas Recovery CT5-2" and "SY / T 6465-2000 Evaluation Method for Foaming Agent for Drainage and Gas Recovery".
[0011] Example 1
[0012] Into a 1 L three-necked flask, add 70 g of soy protein hydrolyzate (hydrolyzed protein mass fraction 36%), 20 g of [(CH3)3SiO]2-Si(CH3)-(CH2)3-(OCH2CH2)9-OH and 300 g of deionized water in sequence, stir evenly at room temperature to obtain a colorless, transparent, viscous liquid, which is the silica protein foam liquid, model SP-1.
[0013] Example 2
[0014] Into a 1 L three-necked flask, add 80 g rapeseed protein hydrolyzate (hydrolyzed protein mass fraction 36%), 20 g [(CH3)3SiO]2-Si(CH3)-(CH2)3-(OCH2CH2)19-OH and 320 g deionized water in sequence, stir evenly at room temperature to obtain a colorless, transparent, viscous liquid, which is silica gel foam liquid, model SP-2.
[0015] Example 3
[0016] Into a 1 L three-necked flask, add 120 g of soy protein hydrolyzate (hydrolyzed protein mass fraction 36%), 20 g of (CH3)3SiO-[Si(CH3)-(CH2)3-(OCH2CH2)14-OH]2-OSi(CH3)3 and 400 g of deionized water in sequence, stir evenly at room temperature to obtain a colorless, transparent, viscous liquid, which is the silicone protein foam liquid, model SP-3.
[0017] Example 4
[0018] According to the petroleum and natural gas industry standards of the People's Republic of China "SY / T 5761-1995 Drainage and Gas Recovery Foaming Agent CT5-2" and "SY / T 6465-2000 Foam Drainage and Gas Recovery Foaming Agent Evaluation Method", the silica protein foam liquid (SP-1, SP-2, SP-3) obtained in Examples 1-3 and the SC type foaming agent (comparative product, Select Oilfield Chemical Company) were tested. All tests were performed 3 times, and the average value was taken as the test result.
[0019] The surface tension test conditions are as follows: at 25°C, the surface tension of a mineralized aqueous solution containing 0.5% of a foaming agent (SP-1, SP-2, SP-3 or SC, the same below) is measured using the ring method.
[0020] The test conditions for foam height and liquid carrying capacity are as follows: at 60 °C, after a mixture of a mineralized aqueous solution containing 0.5% foaming agent and condensate oil (mass ratio 7:3), the initial foam height and the foam height after 3 minutes and 5 minutes are measured by a Roche foam meter, and the mass of the solution carried away by the foam caused by ventilation to the bottom of the solution is measured.
[0021] The mineralized water was prepared as follows: 10 g of calcium chloride and 40 g of sodium chloride were dissolved in a beaker with deionized water, stirred and transferred to a 1000 mL volumetric flask, the beaker and dissolving utensils were rinsed with deionized water for 3 times, the rinse solution was transferred to the volumetric flask, and the solution in the volumetric flask was fixed to volume with distilled water. 1000 mL of mineralized water with a mineralization of 50 g / L was obtained. SP-1, SP-2, SP-3 and SC were diluted to a mass fraction of 0.5% with this mineralized water.
[0022] The condensate oil is petroleum ether (boiling point 60-90 ℃).
[0023] The test results are shown in Tables 1-3. The results show that the surface tension, foaming ability and liquid carrying capacity of the silicone protein foam liquid obtained in Examples 1-3 are better than those of the comparative product.
[0024]
[0025] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.
Claims
1. A silicone protein foam liquid, which is composed of plant protein hydrolyzate, silicone surfactant and water.
2. The silicon protein foam liquid according to claim 1, wherein the mass ratio of the plant protein hydrolyzate, the silicon surfactant and the water is 3-5:1-2:15-20.
3. The silicon protein foam liquid according to claims 1 and 2, wherein the mass fraction of the vegetable protein hydrolysate in the vegetable protein hydrolysate is 35-40%, and the vegetable protein is one of soybean protein, rapeseed protein or sunflower seed protein.
4. The silicone protein foam liquid according to claims 1 and 2, wherein the silicone surfactant structure is one of [(CH3)3SiO]2-Si(CH3)-(CH2)3-(OCH2CH2)n-OH, (CH3)3SiO-[Si(CH3)-(CH2)3-(OCH2CH2)n-OH]2-OSi(CH3)3, wherein n = 8-16.
5. The silicone protein foam liquid according to claims 1 and 2, characterized in that: Used as a foam draining agent.