Foaming agent composition for oil field well cementation, foamed cement paste and preparation method of foamed cement paste
By using foaming agent compositions with components such as alkyl diphenyl ether bissulfonate, foam cement slurry for oil field cementing is prepared, and the problem of poor foaming performance in the prior art is solved, and the efficiency of foam cement slurry is achieved Foaming and stability meet the sealing and compressive strength requirements of oilfield cementing construction.
Patent Information
- Application Number
- CN202310867245.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-14
- Publication Date
- 2025-01-14
AI Technical Summary
The foaming agent in existing foam cement slurry has poor foaming performance, resulting in the lack of long-lasting dispersion of bubbles, affecting molding and compressive strength, and cannot effectively solve the problems of malignant leakage, ring air bleeding and failure of cement ring seal after fracturing.
The foaming agent composition using alkyl diphenyl ether bissulfonate, alkyl glycoside, coconut oleamide propyl betaine, alkyl alcohol amide and octyl phenol polyoxyethylene ether are prepared by specific compatibility methods. The foaming agent composition for cementing oil fields is combined with oil well cement, foam stabilizer, reinforcement, etc. to form foam cement slurry.
The foam cement slurry has achieved high foaming volume, low interfacial tension, long half-life and stability, the density is adjustable, and the strength of the foam cement condensate does not decrease, effectively reducing the permeability of cement stone, improving density, and meeting the requirements of cement injection construction.
Smart Images
Figure CN119306421A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of foam cement slurry, in particular to a foaming agent composition for oil field cementing and a preparation method thereof, and also comprises a foam cement slurry and a preparation method thereof. Background Art
[0002] Foam cement slurry is widely used as a new type of low-density cement slurry. Air or inert gas is used as a lightening agent, and the introduced gas is used to reduce the cement slurry to prepare foam cement slurry. Because of its unique advantages in cementing leakage prevention, anti-channeling and improving the sealing integrity of cement ring, it is called the "universal cement slurry" for cementing. Foam cement slurry is a low-density three-phase viscous fluid. When it is generated, the total area increases and the energy of the system increases. It belongs to a thermodynamically unstable system. The system spontaneously moves in the direction of reducing energy and total area, and the foam bursts. In order to prepare foam cement slurry with excellent performance, it is necessary to introduce a foaming agent into the cement slurry. These surfactant substances can form a directional arrangement on the surface of the solution, thereby significantly reducing the surface tension of the solvent, changing the mechanical strength and viscosity of the foam film, and improving the stability of the foam cement slurry.
[0003] A single or several surfactants may produce abundant bubbles, but the bubbles are likely to be large, and the foam dispersion is not persistent, which affects the molding and compressive strength. After the stirred foam cement slurry is stationary, bubbles will gather and float, and cement, water and gas will be stratified, which often causes poor foaming performance. Therefore, it is necessary to screen and compound surfactants more comprehensively and deeply to further improve the foaming performance and foam stability of foam cement slurry, which has important industrial development significance for fundamentally solving major technical problems such as malignant leakage, annular air channeling and cement annular seal failure after fracturing. Summary of the invention
[0004] The present invention provides a foaming agent composition for oilfield cementing, foam cement slurry and a preparation method thereof, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem of poor cement slurry performance caused by poor foaming performance of the existing foaming agent.
[0005] One of the technical solutions of the present invention is achieved through the following measures: a foaming agent composition for oil field cementing, wherein the raw materials include 5 to 10 parts of alkyl diphenyl ether disulfonate, 10 to 20 parts of alkyl glycoside, 5 to 10 parts of coconut oil amide propyl betaine, 1 to 3 parts of alkyl alcohol amide, 0.5 to 1 part of octylphenol polyoxyethylene ether and 10 to 40 parts of water in parts by weight.
[0006] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The above-mentioned foaming agent composition for oil field cementing is obtained by the following method: The first step is to mix the required amount of alkyl diphenyl ether disulfonate, coconut oil amidopropyl betaine and the required amount of four sixths of water to obtain a mixed material 1; The second step is to mix the required amount of alkyl polyglycoside and one sixth of the required amount of water to obtain a mixed material 2; The third step is to mix the required amount of alkyl alcohol amide, octylphenol polyoxyethylene ether and the remaining amount of water, and then add the mixed material 1 and the mixed material 2 in sequence and mix them to obtain the foaming agent composition for oil field cementing.
[0007] The second technical solution of the present invention is achieved by the following measures: A method for preparing a foaming agent composition for oil field cementing is carried out according to the following method: the first step is to mix the required amount of alkyl diphenyl ether disulfonate, coconut oil amide propyl betaine and the required amount of four sixths of water to obtain a mixed material 1; The second step is to mix the required amount of alkyl polyglycoside and one sixth of the required amount of water to obtain a mixed material 2; The third step is to mix the required amount of alkyl alcohol amide, octylphenol polyoxyethylene ether and the remaining amount of water, and then add the mixed material 1 and the mixed material 2 in sequence and mix them to obtain the foaming agent composition for oil field cementing.
[0008] The third technical solution of the present invention is achieved by the following measures: a foamed cement slurry prepared with one of the technical solutions as raw materials, the raw materials comprising, by weight, 100 parts of oil well cement, 4 to 15 parts of a foaming agent composition solution for oil field cementing, 2 to 8 parts of a foam stabilizer, 3 to 15 parts of an enhancer, 3 to 6 parts of a fluid loss reducer, 0.2 to 1.0 parts of a retarder, 0.6 to 1.5 parts of a dispersant, 0.5 to 4.0 parts of an accelerator and 42 to 72 parts of water.
[0009] The following is a further optimization and / or improvement of the third technical solution of the above invention: The above oil well cement is API oil well G grade cement.
[0010] The fluid loss reducer is a terpolymer of 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid and allyl polyoxyethylene ether; the reinforcing agent is a silicate-polymerized aluminum calcium complex.
[0011] The above-mentioned foaming agent composition solution for oilfield cementing is an aqueous solution of the foaming agent composition for oilfield cementing with a concentration of 50% to 90%, and the foam stabilizer is one or more of a xanthan gum aqueous solution, a carboxymethyl cellulose aqueous solution, a hydroxypropyl methyl cellulose aqueous solution, and a hydroxyethyl methyl cellulose aqueous solution with a concentration of 15% to 65%.
[0012] The retarder is one or more of calcium gluconate liquid, glucose heptanoate liquid, carboxylphosphonate complex and organic acid.
[0013] The dispersant is a mixture of sulfonated formaldehyde acetone condensation product and melamine formaldehyde resin in a mass ratio of 4 to 8:1.
[0014] The coagulant is one or more of calcium formate, triethanolamine and glyoxal.
[0015] The foamed cement slurry is obtained according to the following steps: The first step is to mix the required amount of fluid loss additive, dispersant, retarder and water to obtain a mixed material; The second step is to mix the obtained mixture with a required amount of a setting accelerator, a reinforcing agent and oil well cement to obtain a cement-based slurry; The third step is to sequentially add the required amount of the foaming agent composition solution for oilfield cementing and the foam stabilizer into the obtained cement-based slurry, and stir at a rotation speed of 400 r / min to 12000 r / min for 15s to 60s to obtain foamed cement slurry.
[0016] The fourth technical solution of the present invention is achieved by the following measures: A method for preparing foamed cement slurry is obtained by the following steps: The first step is to mix the required amount of fluid loss additive, dispersant, retarder and water to obtain a mixed material; The second step is to mix the obtained mixture with a required amount of a setting accelerator, a reinforcing agent and oil well cement to obtain a cement-based slurry; The third step is to sequentially add the required amount of the foaming agent composition solution for oilfield cementing and the foam stabilizer into the obtained cement-based slurry, and stir at a rotation speed of 400 r / min to 12000 r / min for 15s to 60s to obtain foamed cement slurry.
[0017] In summary, the foaming agent composition for oilfield cementing of the present invention has the characteristics of good water solubility, good compatibility, dense and lasting foam, low interfacial tension, high foaming amount and long half-life. At the same time, the foam cement slurry prepared with the foaming agent composition for oilfield cementing of the present invention as a raw material has an adjustable density, and the strength of the foamed cement condensate does not decrease, which effectively reduces the permeability of cement stone, improves the density of cement stone, and can meet the requirements of cement injection construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a scanning electron microscope (SEM) image of the foamed cement slurry prepared in Example 14 of the present invention. DETAILED DESCRIPTION
[0019] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical scheme of the present invention and actual conditions. Unless otherwise specified, the various chemical reagents and chemicals mentioned in the present invention are all chemical reagents and chemicals known and used in the prior art; unless otherwise specified, the percentages in the present invention are all mass percentages; unless otherwise specified, the solutions in the present invention are all aqueous solutions in which the solvent is water, for example, the hydrochloric acid solution is an aqueous hydrochloric acid solution.
[0020] The present invention will be further described below in conjunction with embodiments: Embodiment 1: The foaming agent composition for oilfield cementing comprises, by weight, 5 to 10 parts of alkyl diphenyl ether disulfonate, 10 to 20 parts of alkyl glycoside, 5 to 10 parts of coconut oil amide propyl betaine, 1 to 3 parts of alkyl alcohol amide, 0.5 to 1 part of octylphenol polyoxyethylene ether and 10 to 40 parts of water.
[0021] Embodiment 2: As an optimization of the above embodiment, the foaming agent composition for oil field cementing is obtained by the following method: The first step is to mix the required amount of alkyl diphenyl ether disulfonate, coconut oil amidopropyl betaine and the required amount of four sixths of water to obtain a mixed material 1; The second step is to mix the required amount of alkyl polyglycoside and one sixth of the required amount of water to obtain a mixed material 2; The third step is to mix the required amount of alkyl alcohol amide, octylphenol polyoxyethylene ether and the remaining amount of water, and then add the mixed material 1 and the mixed material 2 in sequence and mix them to obtain the foaming agent composition for oil field cementing.
[0022] Example 3: A foamed cement slurry is prepared using the foaming agent composition for oilfield cementing described in the above example as raw material, wherein the raw materials include, by weight, 100 parts of oilwell cement, 4 to 15 parts of a foaming agent composition solution for oilfield cementing, 2 to 8 parts of a foam stabilizer, 3 to 15 parts of an enhancer, 3 to 6 parts of a fluid loss reducer, 0.2 to 1.0 parts of a retarder, 0.6 to 1.5 parts of a dispersant, 0.5 to 4.0 parts of an accelerator, and 42 to 72 parts of water.
[0023] The foaming agent composition for oilfield cementing of the present invention is used in combination with a tackifying foam stabilizer to enhance foam stability and reduce the loss of formed foam in subsequent treatment of foam cement slurry through the synergistic effect of the foaming agent and the foam stabilizer. Within the usage ratio range of the present invention, bubbles are introduced more evenly during aeration of the foam cement slurry, and the amount of bubbles is highly maintained during processing.
[0024] Example 4: As an optimization of the above example, the oil well cement is API oil well G grade cement.
[0025] Embodiment 5: As an optimization of the above embodiment, the fluid loss reducer is a terpolymer of 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid and allyl polyoxyethylene ether; and the reinforcing agent is a silicate-polyaluminum calcium complex.
[0026] The fluid loss reducer (a terpolymer of 2-acrylamide-2-methylpropane sulfonic acid, acrylic acid and allyl polyoxyethylene ether) and the reinforcing agent (a silicate-polyaluminum calcium complex) used in the present invention are both provided by Chengdu Chuanfeng Chemical Engineering Co., Ltd.
[0027] Example 6: As an optimization of the above example, the foaming agent composition solution for oilfield cementing is an aqueous solution of the foaming agent composition for oilfield cementing with a concentration of 50% to 90%, and the foam stabilizer is one or more of a xanthan gum aqueous solution with a concentration of 15% to 65%, a carboxymethyl cellulose aqueous solution with a concentration of 15% to 65%, a hydroxypropyl methyl cellulose aqueous solution with a concentration of 15% to 65%, and a hydroxyethyl methyl cellulose aqueous solution with a concentration of 15% to 65%.
[0028] Example 7: As an optimization of the above example, the retarder is one or more of calcium gluconate liquid, glucose heptanoate liquid, carboxyphosphonate complex and organic acid.
[0029] The retarder (calcium gluconate liquid, glucose heptanoate liquid, carboxylphosphonate complex or organic acid) used in the present invention is provided by Tianjin Sida Co., Ltd.
[0030] Example 8: As an optimization of the above example, the dispersant is a mixture of sulfonated formaldehyde acetone condensation product and melamine formaldehyde resin in a mass ratio of 4 to 8:1.
[0031] Embodiment 9: As an optimization of the above embodiment, the coagulant is one or more of calcium formate, triethanolamine and glyoxal.
[0032] Embodiment 10: As an optimization of the above embodiment, the foamed cement slurry is obtained according to the following steps: The first step is to mix the required amount of fluid loss additive, dispersant, retarder and water to obtain a mixed material; The second step is to mix the obtained mixture with a required amount of a setting accelerator, a reinforcing agent and oil well cement to obtain a cement-based slurry; The third step is to sequentially add the required amount of the foaming agent composition solution for oilfield cementing and the foam stabilizer into the obtained cement-based slurry, and stir at a rotation speed of 400 r / min to 12000 r / min for 15s to 60s to obtain foamed cement slurry.
[0033] The foaming agent composition for oilfield cementing of the present invention has good water solubility and good compatibility, and the generated foam is dense and lasting. The present invention provides a convenient and feasible foaming agent preparation method with low interfacial tension, high foaming amount, long half-life, solves the problem of poor foaming performance of the existing foaming agent, and ensures the uniformity and stability of the foamed cement.
[0034] The foaming agent composition for oilfield cementing of the present invention contains an alkyl glycoside component, which is biodegradable in the natural environment and has much lower toxicity than existing foaming agents. It can effectively reduce deep soil pollution, has the advantages of high efficiency, environmental protection and low cost, and can act efficiently and accurately in the oil and gas well area.
[0035] The foamed cement slurry system of the present invention is stable. By introducing the foaming agent composition for oilfield cementing of the present invention into the cement-based slurry, the density of the foamed cement slurry of the present invention is adjustable, and the strength of the foamed cement coagulant does not decrease, the permeability of the cement stone is effectively reduced, the density of the cement stone is improved, and the requirements for cement injection construction can be met.
[0036] Embodiment 11: The foaming agent composition for oilfield cementing comprises, by weight, 5 parts of alkyl diphenyl ether disulfonate, 10 parts of alkyl glycoside, 5 parts of coconut oil amide propyl betaine, 1 part of alkyl alcohol amide, 0.8 parts of octylphenol polyoxyethylene ether and 30 parts of water, and is obtained by the following method: The first step is to mix the required amount of alkyl diphenyl ether disulfonate, coconut oil amidopropyl betaine and the required amount of four sixths of water to obtain a mixed material 1; The second step is to mix the required amount of alkyl polyglycoside and one sixth of the required amount of water to obtain a mixed material 2; The third step is to mix the required amount of alkyl alcohol amide, octylphenol polyoxyethylene ether and the remaining amount of water, and then add the mixed material 1 and the mixed material 2 in sequence and mix them to obtain the foaming agent composition for oil field cementing.
[0037] The foam cement slurry comprises, by weight, 100 parts of API oil well G grade cement, 6 parts of a foaming agent composition solution for oil field cementing (a 50% aqueous solution of a foaming agent composition for oil field cementing), 3 parts of a foam stabilizer (a 15% aqueous solution of xanthan gum), 4 parts of a silicate-polyaluminum calcium complex, 3 parts of a terpolymer of 2-acrylamido-2-methylpropane sulfonic acid, acrylic acid and allyl polyoxyethylene ether, 0.8 parts of a calcium gluconate liquid, 0.9 parts of a dispersant (a 4:1 mass ratio sulfonated formaldehyde acetone condensation product and melamine formaldehyde resin), 1 part of calcium formate and 52 parts of water, and is obtained by the following steps: The first step is to mix the required amounts of 2-acrylamido-2-methylpropanesulfonic acid, a terpolymer of acrylic acid and allyl polyoxyethylene ether, a dispersant (sulfonated formaldehyde acetone condensation product and melamine formaldehyde resin in a mass ratio of 4:1), a calcium gluconate liquid and water to obtain a mixed material; The second step is to mix the obtained mixture with a required amount of calcium formate, silicate-polyaluminum calcium complex and API oil well G grade cement to obtain cement-based slurry; The third step is to add the required amount of 50% aqueous solution of the foaming agent composition for oilfield cementing and 15% aqueous solution of xanthan gum to the obtained cement-based slurry in sequence, stir at a speed of 400 r / min for 60 seconds to obtain foamed cement slurry, and cure the foamed cement slurry to obtain foamed cement stone after solidification.
[0038] Embodiment 12: The foaming agent composition for oilfield cementing comprises, by weight, 5 parts of alkyl diphenyl ether disulfonate, 15 parts of alkyl glycoside, 5 parts of coconut oil amide propyl betaine, 2 parts of alkyl alcohol amide, 1 part of octylphenol polyoxyethylene ether and 22 parts of water, and is obtained by the following method: The first step is to mix the required amount of alkyl diphenyl ether disulfonate, coconut oil amidopropyl betaine and the required amount of four sixths of water to obtain a mixed material 1; The second step is to mix the required amount of alkyl polyglycoside and one sixth of the required amount of water to obtain a mixed material 2; The third step is to mix the required amount of alkyl alcohol amide, octylphenol polyoxyethylene ether and the remaining amount of water, and then add the mixed material 1 and the mixed material 2 in sequence and mix them to obtain the foaming agent composition for oil field cementing.
[0039] The foam cement slurry comprises, by weight, 100 parts of API oil well G grade cement, 7 parts of a foaming agent composition solution for oil field cementing (a 90% aqueous solution of a foaming agent composition for oil field cementing), 3.5 parts of a foam stabilizer (a 65% aqueous solution of carboxymethyl cellulose), 4 parts of a silicate-polyaluminum calcium complex, 4 parts of a terpolymer of 2-acrylamido-2-methylpropane sulfonic acid, acrylic acid and allyl polyoxyethylene ether, 0.6 parts of a carboxylphosphonate complex, 0.9 parts of a dispersant (a sulfonated formaldehyde acetone condensate and a melamine formaldehyde resin in a mass ratio of 8:1), 1 part of triethanolamine and 50 parts of water, and is obtained by the following steps: The first step is to mix the required amounts of 2-acrylamido-2-methylpropanesulfonic acid, a terpolymer of acrylic acid and allyl polyoxyethylene ether, a dispersant (a sulfonated formaldehyde acetone condensate and a melamine formaldehyde resin in a mass ratio of 8:1), a carboxylphosphonate complex and water to obtain a mixed material; The second step is to mix the obtained mixture with a required amount of triethanolamine, silicate-polyaluminum calcium complex and API oil well G grade cement to obtain cement-based slurry; The third step is to add the required amount of 90% aqueous solution of the foaming agent composition for oilfield cementing and 65% aqueous solution of carboxymethyl cellulose to the obtained cement-based slurry in sequence, stir at a speed of 12000 r / min for 15 seconds to obtain foamed cement slurry, and cure the foamed cement slurry to obtain foamed cement stone after solidification.
[0040] Embodiment 13: The foaming agent composition for oilfield cementing comprises raw materials, by weight, including 10 parts of alkyl diphenyl ether disulfonate, 10 parts of alkyl glycoside, 6 parts of coconut oil amide propyl betaine, 1.5 parts of alkyl alcohol amide, 0.5 parts of octylphenol polyoxyethylene ether and 22 parts of water, and is obtained by the following method: The first step is to mix the required amount of alkyl diphenyl ether disulfonate, coconut oil amidopropyl betaine and the required amount of four sixths of water to obtain a mixed material 1; The second step is to mix the required amount of alkyl polyglycoside and one sixth of the required amount of water to obtain a mixed material 2; The third step is to mix the required amount of alkyl alcohol amide, octylphenol polyoxyethylene ether and the remaining amount of water, and then add the mixed material 1 and the mixed material 2 in sequence and mix them to obtain the foaming agent composition for oil field cementing.
[0041] The foam cement slurry comprises, by weight, 100 parts of API oil well G grade cement, 8 parts of a foaming agent composition solution for oil field cementing (a 60% concentration of a foaming agent composition aqueous solution for oil field cementing), 5 parts of a foam stabilizer (a 45% concentration of a hydroxypropyl methylcellulose aqueous solution), 4 parts of a silicate-polyaluminum calcium complex, 3 parts of a terpolymer of 2-acrylamido-2-methylpropane sulfonic acid, acrylic acid and allyl polyoxyethylene ether, 0.7 parts of an organic acid, 0.9 parts of a dispersant (a 6:1 mass ratio of sulfonated formaldehyde acetone condensation product and melamine formaldehyde resin), 1 part of glyoxal and 50 parts of water, and is obtained by the following steps: The first step is to mix the required amounts of 2-acrylamido-2-methylpropanesulfonic acid, a terpolymer of acrylic acid and allyl polyoxyethylene ether, a dispersant (sulfonated formaldehyde acetone condensate and melamine formaldehyde resin in a mass ratio of 6:1), an organic acid and water to obtain a mixed material; The second step is to mix the obtained mixture with a required amount of glyoxal, silicate-polyaluminum calcium complex and API oil well G grade cement to obtain cement-based slurry; The third step is to sequentially add the required amount of 60% aqueous solution of the foaming agent composition for oilfield cementing and 45% aqueous solution of hydroxypropyl methylcellulose to the obtained cement-based slurry, stir for 15 to 60 seconds at a speed of 12000 r / min to obtain foamed cement slurry, and cure the foamed cement slurry to obtain foamed cement stone after solidification.
[0042] Embodiment 14: The foaming agent composition for oilfield cementing comprises raw materials, by weight, including 10 parts of alkyl diphenyl ether disulfonate, 20 parts of alkyl glycoside, 8 parts of coconut oil amide propyl betaine, 2 parts of alkyl alcohol amide, 1 part of octylphenol polyoxyethylene ether and 11 parts of water, and is obtained by the following method: The first step is to mix the required amount of alkyl diphenyl ether disulfonate, coconut oil amidopropyl betaine and the required amount of four sixths of water to obtain a mixed material 1; The second step is to mix the required amount of alkyl polyglycoside and one sixth of the required amount of water to obtain a mixed material 2; The third step is to mix the required amount of alkyl alcohol amide, octylphenol polyoxyethylene ether and the remaining amount of water, and then add the mixed material 1 and the mixed material 2 in sequence and mix them to obtain the foaming agent composition for oil field cementing.
[0043] The foam cement slurry comprises, by weight, 100 parts of API oil well G grade cement, 10 parts of a foaming agent composition solution for oil field cementing (an aqueous solution of a foaming agent composition for oil field cementing with a concentration of 80%), 6 parts of a foam stabilizer (an aqueous solution of hydroxyethyl methylcellulose with a concentration of 50%), 4 parts of a silicate-polyaluminum calcium complex, 3.5 parts of a terpolymer of 2-acrylamido-2-methylpropane sulfonic acid, acrylic acid and allyl polyoxyethylene ether, 0.9 parts of a glucose heptanoate liquid, 0.9 parts of a dispersant (a sulfonated formaldehyde acetone condensate and a melamine formaldehyde resin with a mass ratio of 4:1), 1 part of calcium formate and 49 parts of water, and is obtained by the following steps: The first step is to mix the required amounts of 2-acrylamido-2-methylpropanesulfonic acid, a terpolymer of acrylic acid and allyl polyoxyethylene ether, a dispersant (sulfonated formaldehyde acetone condensation product and melamine formaldehyde resin in a mass ratio of 4:1), a glucose heptanoate liquid and water to obtain a mixed material; The second step is to mix the obtained mixture with a required amount of calcium formate, silicate-polyaluminum calcium complex and API oil well G grade cement to obtain cement-based slurry; The third step is to add the required amount of 80% aqueous solution of the foaming agent composition for oilfield cementing and 50% aqueous solution of hydroxyethyl methylcellulose to the obtained cement-based slurry in sequence, stir at a speed of 12000 r / min for 15 seconds to obtain foamed cement slurry, and cure the foamed cement slurry to obtain foamed cement stone after solidification.
[0044] Example 15: The performance of the foaming agent composition for oilfield cementing and the foamed cement slurry prepared in Examples 11 to 14 of the present invention were tested, wherein the performance test of the foaming agent composition for oilfield cementing of the present invention includes half-life (s), foaming amount (mL), interfacial tension (mN / m) and foam structure; the performance test of the foamed cement slurry of the present invention includes density (g / cm3), experimental temperature (℃), experimental pressure (MPa), sedimentation stability (g / cm3), API water loss (mL), thickening time (min), 24h compressive strength (MPa) and 24h permeability (mD). The performance test of the foaming agent composition for oilfield cementing of the present invention is shown in Table 1, and the performance test of the foamed cement slurry of the present invention is shown in Table 2. It can be seen from Table 1 and Table 2 that the foaming agent composition for oilfield cementing of the present invention has a long half-life, a high foaming amount and a low interfacial tension, and foams rapidly with uniform and fine foam; the density of the foamed cement slurry of the present invention is adjustable from 0.80 g / cm3 to 1.40 g / cm3, the 24h compressive strength is basically not reduced, and the 24h permeability is low.
[0045] In addition, the foamed cement slurry prepared in Example 14 of the present invention was observed using a scanning electron microscope. The scanning electron microscope (SEM) image of the foamed cement slurry of the present invention is as follows: Figure 1 As shown by Figure 1 It can be seen that the foam cement slurry of the present invention has fine and dense foam distribution, uniform and lasting foam, and a foam diameter of about 150 μm, indicating that the preparation method of the foam cement slurry provided by the present invention can form foam cement stone with uniform and fine foam.
[0046] In summary, the foaming agent composition for oilfield cementing of the present invention has the characteristics of good water solubility, good compatibility, dense and lasting foam, low interfacial tension, high foaming amount and long half-life. At the same time, the foam cement slurry prepared with the foaming agent composition for oilfield cementing of the present invention as a raw material has an adjustable density, and the strength of the foamed cement condensate does not decrease, which effectively reduces the permeability of cement stone, improves the density of cement stone, and can meet the requirements of cement injection construction.
[0047] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.
Claims
1. A foaming agent composition for oil field cementing, characterized in that The raw materials include 5 to 10 parts of alkyl diphenyl ether disulfonate, 10 to 20 parts of alkyl glycoside, 5 to 10 parts of coconut oil amide propyl betaine, 1 to 3 parts of alkyl alcohol amide, 0.5 to 1 part of octylphenol polyoxyethylene ether and 10 to 40 parts of water in parts by weight.
2. The foaming agent composition for oil field cementing according to claim 1, characterized in that Obtained as follows: The first step is to mix the required amount of alkyl diphenyl ether disulfonate, coconut oil amidopropyl betaine and the required amount of four sixths of water to obtain a mixed material 1; The second step is to mix the required amount of alkyl polyglycoside and one sixth of the required amount of water to obtain a mixed material 2; The third step is to mix the required amount of alkyl alcohol amide, octylphenol polyoxyethylene ether and the remaining amount of water, and then add the mixed material 1 and the mixed material 2 in sequence and mix them to obtain the foaming agent composition for oil field cementing.
3. A method for preparing a foaming agent composition for oil field cementing according to claim 1 or 2, characterized in that Obtained as follows: The first step is to mix the required amount of alkyl diphenyl ether disulfonate, coconut oil amidopropyl betaine and the required amount of four sixths of water to obtain a mixed material 1; The second step is to mix the required amount of alkyl polyglycoside and one sixth of the required amount of water to obtain a mixed material 2; The third step is to mix the required amount of alkyl alcohol amide, octylphenol polyoxyethylene ether and the remaining amount of water, and then add the mixed material 1 and the mixed material 2 in sequence and mix them to obtain the foaming agent composition for oil field cementing.
4. A foamed cement slurry prepared using the foaming agent composition for oilfield cementing according to claim 1 or 2 as a raw material, characterized in that The raw materials include, by weight, 100 parts of oil well cement, 4 to 15 parts of foaming agent composition solution for oil field cementing, 2 to 8 parts of foam stabilizer, 3 to 15 parts of enhancer, 3 to 6 parts of fluid loss reducer, 0.2 to 1.0 parts of retarder, 0.6 to 1.5 parts of dispersant, 0.5 to 4.0 parts of accelerator and 42 to 72 parts of water.
5. The foamed cement slurry according to claim 4, characterized in that The oil well cement is API oil well G grade cement; or / and, the fluid loss reducer is a terpolymer of 2-acrylamide-2-methylpropane sulfonic acid, acrylic acid and allyl polyoxyethylene ether; or / and, the reinforcing agent is a silicate-polymerized aluminum calcium complex.
6. The foamed cement slurry according to claim 4 or 5, characterized in that The foaming agent composition solution for oilfield cementing is an aqueous solution of the foaming agent composition for oilfield cementing with a concentration of 50% to 90%, the foam stabilizer is one or more of a xanthan gum aqueous solution with a concentration of 15% to 65%, a carboxymethyl cellulose aqueous solution with a concentration of 15% to 65%, a hydroxypropyl methyl cellulose aqueous solution with a concentration of 15% to 65%, and a hydroxyethyl methyl cellulose aqueous solution with a concentration of 15% to 65%; or / and, the retarder is one or more of a calcium gluconate liquid, a glucose heptanoate liquid, a carboxyphosphonate complex and an organic acid.
7. The foamed cement slurry according to claim 4, 5 or 6, characterized in that The dispersant is a mixture of sulfonated formaldehyde acetone condensate and melamine formaldehyde resin in a mass ratio of 4 to 8:1; or / and the coagulant is one or more of calcium formate, triethanolamine and glyoxal.
8. The foamed cement slurry according to any one of claims 4 to 7, characterized in that Obtained as follows: The first step is to mix the required amount of fluid loss additive, dispersant, retarder and water to obtain a mixed material; The second step is to mix the obtained mixture with a required amount of a setting accelerator, a reinforcing agent and oil well cement to obtain a cement-based slurry; The third step is to sequentially add the required amount of the foaming agent composition solution for oilfield cementing and the foam stabilizer into the obtained cement-based slurry, and stir at a rotation speed of 400 r / min to 12000 r / min for 15s to 60s to obtain foamed cement slurry.
9. A method for preparing foamed cement slurry according to any one of claims 4 to 7, characterized in that Proceed as follows: The first step is to mix the required amount of fluid loss additive, dispersant, retarder and water to obtain a mixed material; The second step is to mix the obtained mixture with a required amount of a setting accelerator, a reinforcing agent and oil well cement to obtain a cement-based slurry; The third step is to sequentially add the required amount of the foaming agent composition solution for oilfield cementing and the foam stabilizer into the obtained cement-based slurry, and stir at a rotation speed of 400 r / min to 12000 r / min for 15s to 60s to obtain foamed cement slurry.