CN113416277B - Non-foaming oil well cement latex fluid loss agent, preparation method and application - Google Patents
Non-foaming oil well cement latex fluid loss agent, preparation method and application Download PDFInfo
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- CN113416277B CN113416277B CN202110972126.5A CN202110972126A CN113416277B CN 113416277 B CN113416277 B CN 113416277B CN 202110972126 A CN202110972126 A CN 202110972126A CN 113416277 B CN113416277 B CN 113416277B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
- C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/06—Hydrocarbons
- C08F212/08—Styrene
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/487—Fluid loss control additives; Additives for reducing or preventing circulation loss
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Abstract
The invention belongs to the field of oil and gas well cementation and oilfield chemistry, and particularly relates to a preparation method and application of a non-foaming oil well cement latex fluid loss agent. The fluid loss agent is a copolymer obtained by a soap-free emulsion polymerization method by using 2-acrylamide-2-methyl propane sodium sulfonate, styrene and butyl acrylate as comonomers, wherein the comonomers are 2-acrylamide-2-methyl propane sodium sulfonate: styrene: butyl acrylate = (3.8-6): 5: 4. the non-foaming oil well cement latex fluid loss agent for oil well cement paste has good temperature and salt resistance effects, has good fluid loss reduction effects when being added into conventional cement paste, thixotropic cement paste and phosphoaluminate cement paste, has good compounding and using effects with common additives for oil well cement, and has an improvement effect on thickening time, compressive strength, rheological property and the like.
Description
Technical Field
The invention belongs to the field of oil and gas well cementation and oilfield chemistry, and particularly relates to a non-foaming oil well cement latex fluid loss agent, and a preparation method and application thereof.
Background
In recent years, with the continuous development of the oil industry, the exploration and exploitation of oil and gas resources have been gradually enlarged. The petroleum exploitation develops towards deep wells, ultra-deep wells, marine petroleum and the like, the exploitation difficulty is increased, and great challenges are brought to well cementation construction. Under complex well conditions, how to ensure the construction safety of well cementation, improve the well cementation quality and ensure the effective packing between layers becomes a key technical problem in the well cementation cement slurry technology, and simultaneously, higher requirements are provided for well cementation additives. The fluid loss agent is one of three main agents and is mainly used for controlling the water loss amount of cement paste and avoiding the cement paste from losing water due to the fact that free water in the cement paste permeates into a stratum in large quantity, and further density is increased and pumping is difficult to achieve, and finally well cementation failure is caused.
The existing fluid loss agents for oil well cement can be divided into two categories, namely water-soluble fluid loss agents and particle fluid loss agents, the water-soluble fluid loss agents can be divided into natural polymer categories and synthetic polymer categories, and the particle fluid loss agents can be divided into inorganic particles and latex categories. The water-soluble fluid loss agent is a long molecular chain polymer, the water loss of cement paste is reduced mainly by adsorption on the surface of cement particles, the compatibility problem often exists with a retarder and a dispersing agent which play a retarding role by adsorption on the surface of the cement particles, and after the common cement paste thixotropic agent xanthan gum and the like are added into the cement paste containing the fluid loss agent, the common cement paste thixotropic agent and the fluid loss agent are mutually wound to interfere with the action of the fluid loss agent, so that the fluid loss effect of the fluid loss agent is weakened. The granule fluid loss agent controls water loss through physical blockage, and has better compatibility with other types of cement admixtures. However, the inorganic particle fluid loss agent cannot deform under extrusion, and the fluid loss effect is limited. The latex fluid loss agent has a good effect of controlling fluid loss, and commonly comprises styrene-butadiene latex and styrene-acrylic latex, but in the preparation process of the traditional latex, in order to prevent latex from polymerizing and improve the stability of the latex, a large amount of stabilizer needs to be added into a latex system, and the stabilizer is also a foaming agent, so that a large amount of bubbles can be generated after cement slurry is added into the latex, the bubbles are difficult to eliminate, the accurate determination of the density of the cement slurry on site is influenced, and the latex fluid loss agent for the non-foaming well cementation cement is prepared and formed, so that the significance is great.
Disclosure of Invention
The invention aims to provide a non-foaming oil well cement latex fluid loss agent. It is another object of the present invention to apply the non-foaming oil well cement latex fluid loss additive synthesized by the present invention to different kinds of cement slurry systems and to match with common oil well cement additives.
The non-foaming oil well cement latex fluid loss agent is prepared by taking styrene, butyl acrylate and 2-acrylamide-2-methyl propane sodium sulfonate as comonomers, taking a redox initiation system of potassium persulfate and sodium bisulfite as an initiator and adopting a soap-free emulsion polymerization method. Wherein the comonomer is 2-acrylamide-2-methyl propane sodium sulfonate by mass ratio: styrene: butyl acrylate = (3.8-6): 5: 4.
in the invention, styrene is a hard monomer, and the molecular chain rigidity of the polymer is increased; butyl acrylate is a soft monomer, and the molecular chain elasticity of the polymer is improved; the 2-acrylamide-2-methyl propane sodium sulfonate is a functional monomer and replaces an emulsifier to participate in copolymerization reaction, so that the temperature resistance and salt resistance of the polymer are improved. The monomers used cannot be replaced by other monomers.
The preparation method of the non-foaming oil well cement latex fluid loss agent according to the embodiment of the invention can also have the following additional technical characteristics:
preferably, in the preparation process by adopting the soap-free emulsion polymerization method, the comonomer of 2-acrylamide-2-methyl propane sodium sulfonate is completely dissolved in distilled water, the pH value is adjusted, the comonomers of styrene and butyl acrylate are added under the condition of heating and stirring, and the initiator is added for polymerization reaction.
Preferably, the mass ratio of the comonomer 2-acrylamide-2-methyl propane sodium sulfonate, the styrene and the butyl acrylate is (3.8-6): 5:4, the addition of the comonomer accounts for 30-40% of the mass of the distilled water, and the addition of the initiator accounts for 1.5-2% of the sum of the mass of the comonomer.
Preferably, the reaction temperature in the polymerization reaction process is 75-85 ℃, the comonomer is stirred for 0.5h at the rotating speed of 400r/min, the initiator is added, the stirring is continued for 2-4 h, and the product latex is obtained after the reaction is finished.
Preferably, the initiator is potassium persulfate and sodium bisulfite, and the mass ratio is 1: 1.
The invention relates to a preparation method of a non-foaming oil well cement latex fluid loss agent, which comprises the following specific steps: fully dissolving 2-acrylamide-2-methyl propane sodium sulfonate in 120g of distilled water, adding 0.5mol/L sodium hydroxide solution to adjust the pH value to 6-7, adding the solution with the adjusted pH value into a three-neck flask provided with blades, a separating funnel and a nitrogen pipe, adding a certain amount of styrene and butyl acrylate under the condition of heating and stirring, opening the separating funnel after heating and stirring for 0.5h, adding an initiator, and continuously stirring for 2-4 h to obtain the product fluid loss agent. In the invention, the 2-acrylamide-2-methyl propane sodium sulfonate is acidic and is easy to hydrolyze under an alkaline heating condition, so that the pH of the solution is adjusted to be weakly acidic to neutral.
The non-foaming oil well cement latex fluid loss agent has good temperature and salt resistance effects, does not cause cement slurry foaming, has good fluid loss reduction effect when added into conventional cement slurry, thixotropic cement slurry and phosphoaluminate cement slurry, has good use effect when compounded with common additives of oil well cement, and has improvement effect on thickening time, compressive strength, rheological property and the like.
Detailed Description
Example 1
(1) Dissolving 2-acrylamide-2-methyl propane sodium sulfonate in distilled water, and adjusting the pH value to 6 to obtain a solution I;
(2) and under the protection of nitrogen, heating to 85 ℃, adding styrene and butyl acrylate into the solution I, stirring for reaction for 0.5h, adding an initiator, and continuously stirring for 4h to obtain a product, namely BSA-1. The experiment was carried out using Jiahua grade G cement, the preparation and testing of the cement slurries being carried out according to the standard procedures of GB/T19139-.
Sodium 2-acrylamido-2-methylpropanesulfonate: styrene: the mass ratio of butyl acrylate is 6:5: 4;
the initiator is a mixture of potassium persulfate and sodium bisulfite, and the mass ratio is 1: 1;
the addition amount of the initiator is 1.5 percent of the total mass of the comonomer;
the addition of the distilled water was 2.5 times the total mass of the comonomer.
Example 2
(1) Dissolving 2-acrylamide-2-methyl propane sodium sulfonate in distilled water, and adjusting the pH value to 7 to obtain a solution I;
(2) and (3) under the protection of nitrogen, heating to 75 ℃, adding styrene and butyl acrylate into the solution I, stirring for reaction for 0.5h, adding an initiator, and continuously stirring for 2h to obtain the product.
Sodium 2-acrylamido-2-methylpropanesulfonate: styrene: the mass ratio of butyl acrylate is 3.8:5: 4;
the initiator is a mixture of potassium persulfate and sodium bisulfite, and the mass ratio is 1: 1;
the addition amount of the initiator is 2 percent of the total mass of the comonomer;
the addition of the distilled water was 3.3 times the total mass of the comonomer.
Example 3
(1) Dissolving 2-acrylamide-2-methyl propane sodium sulfonate in distilled water, and adjusting the pH value to 7 to obtain a solution I;
(2) and under the protection of nitrogen, heating to 80 ℃, adding styrene and butyl acrylate into the solution I, stirring for reaction for 0.5h, adding an initiator, and continuously stirring for 3h to obtain the product.
Sodium 2-acrylamido-2-methylpropanesulfonate: styrene: the mass ratio of butyl acrylate is 5:5: 4;
the initiator is a mixture of potassium persulfate and sodium bisulfite, and the mass ratio is 1: 1;
the addition amount of the initiator is 2 percent of the total mass of the comonomer;
the addition of the distilled water is 3 times of the total mass of the comonomer.
Comparative example 1
The performance of styrene-butadiene latex for traditional well cementation cement slurry in conventional cement slurry is tested, and the cement slurry is prepared according to the following formula: jiahua G-grade cement, 0.5 percent of SGJZ dispersant, 12.5 percent of styrene-butadiene latex and 44 percent of fresh water, and the water loss of the conventional density cement slurry added with the styrene-butadiene latex is measured. The experimental temperature is set to normal temperature, 60 ℃ and 90 ℃, and fresh water is used for preparing the slurry. After the cement paste containing the styrene-butadiene latex is stirred, a large amount of bubbles are generated.
TABLE 1 dehydration characteristics of styrene-butadiene latex cement slurries
Experimental example 1
The temperature resistance and salt resistance of the latex fluid loss agent BSA-1 in the conventional cement paste are tested, and the cement paste is prepared according to the following formula: jiahua G-grade cement, 0.5% SGJZ dispersant, 7.5% -17.5% latex fluid loss additive BSA-1+44% fresh water/half saturated salt water/saturated salt water, and the addition of the latex fluid loss additive BSA-1 is measured to be 7.5%, 10%, 12.5%, 15% and 17.5% of the water loss amount of the conventional cement paste. The experimental temperature is set at normal temperature, 60 ℃ and 90 ℃, and fresh water, half-saturated saline water and saturated saline water are respectively used for preparing the slurry. After the cement paste added with the latex fluid loss agent BSA-1 is stirred, no air bubbles are generated basically, and the accurate measurement and safe construction of the density of the cement paste on site are facilitated.
TABLE 2 temperature and salt resistance of latex fluid loss additives BSA-1 on conventional cement slurries
As can be seen from Table 2, when the water loss amount of the cement paste added with the latex water loss reducer BSA-1 is tested at different temperatures and different mineralization degrees, the water loss of the cement paste is remarkably improved, and when the addition amount of the latex water loss reducer BSA-1 is 17.5%, the water loss amount of the cement paste at 90 ℃ is only 26.4 mL/30min, and the water loss amount of the cement paste prepared by using saturated saline water is only 35.7 mL/30 min. The latex fluid loss additive BSA-1 has good temperature and salt resistance in the conventional cement slurry.
Experimental example 2
The performance of the latex fluid loss agent BSA-1 in the thixotropic cement paste is tested, acrylamide type thixotropic cement paste and xanthan type thixotropic cement paste are respectively used, and the formula is as follows: jiahua G-grade cement, 7.5-17.5% of latex fluid loss additive BSA-1, 0.2% of dispersing agent, 0.20-0.25% of calcium chloride, 3% of acrylamide, 0.05% of MBA, 0.3% of ammonium persulfate and 46% of water, Jiahua G-grade cement, 0.5% of xanthan gum, 2% of DZH-3 retarder, 1% of dispersing agent SCD, and 7.5-17.5% of latex fluid loss additive BSA-1 and 44% of water.
TABLE 3 influence of latex fluid loss agent BSA-1 on thixotropic cement slurry water loss
As can be seen from Table 3, the latex fluid loss agent BSA-1 has good water loss control capability on both acrylamide type thixotropic cement slurry and xanthan type thixotropic cement slurry, and can respectively control the water loss amount to be 37.2 mL/30min and 26.8 mL/30min when the addition amount is 17.5%. The latex fluid loss agent BSA-1 has a good fluid loss reducing effect in thixotropic cement slurry.
Experimental example 3
The performance of the latex fluid loss additive BSA-1 in phosphoaluminate cement paste is tested, and the cement paste is prepared according to the following formula: phosphoaluminate cement, 2.5 percent of DZH-3 retarder, 0.5 percent of dispersant, 7.5 to 17.5 percent of latex fluid loss additive BSA-1 and 44 percent of water.
TABLE 4 influence of latex fluid loss additive BSA-1 on the water loss of phosphoaluminate slurries
As can be seen from Table 4, the addition of the latex fluid loss additive BSA-1 has a significant improvement effect on the water loss of the phosphoaluminate cement paste, and the water loss can be controlled to be 38.4 mL/30min when the addition is 17.5%. The latex fluid loss agent BSA-1 has a good fluid loss reducing effect in phosphoaluminate cement slurry.
Experimental example 4
The suitability of the latex fluid loss agent BSA-1 and a common dispersant for oil well cement is tested, and cement slurry is prepared according to the following formula: jiahua G-grade cement, 0.5 percent of SGJZ dispersant, 4 percent of aldehyde ketone dispersant, 5 percent of micro silicon, 0 to 17.5 percent of latex fluid loss additive BSA-1 and 50 percent of water.
TABLE 5 Adaptation of latex fluid loss additives BSA-1 with commonly used dispersants
As can be seen from Table 5, the latex fluid loss additive BSA-1 and the two dispersants have the effects of prolonging the thickening time of the cement paste, enhancing the compressive strength of the set cement, slightly reducing the fluidity of the cement paste and obviously improving the sedimentation stability of the cement paste when being compounded and used respectively. The latex fluid loss additive BSA-1, the SGJZ dispersant and the aldehyde ketone dispersant have good adaptability.
Experimental example 5
The latex fluid loss agent BSA-1 and a common retarder for oil well cement are subjected to suitability test, and cement paste is prepared according to the following formula: jiahua G-grade cement, 0.4 percent of DZH-3 retarder, 0.1 percent of H21L retarder, 5 percent of micro silicon, 0 to 17.5 percent of latex fluid loss agent BSA-1 and 44 percent of water.
TABLE 6 suitability of latex fluid loss additives BSA-1 with conventional retarders
As can be seen from Table 6, the latex filtrate reducer BSA-1 and the two retarders are compounded for use, so that the thickening time of cement paste is prolonged to a certain extent, the compressive strength of set cement is enhanced, and the fluidity of the cement paste is improved. The latex fluid loss additive BSA-1, DZH-3 retarder and H21L retarder of the invention have good adaptability.
Claims (7)
1. The non-foaming oil well cement latex fluid loss agent is characterized in that the fluid loss agent is a copolymer obtained by a soap-free emulsion polymerization method by taking 2-acrylamido-2-methyl propane sodium sulfonate, styrene and butyl acrylate as comonomers, wherein the comonomers are 2-acrylamido-2-methyl propane sodium sulfonate: styrene: butyl acrylate = (3.8-6): 5: 4.
2. the method for preparing the non-foaming oil well cement latex fluid loss agent as claimed in claim 1, which is characterized by comprising the following specific steps:
(1) dissolving 2-acrylamide-2-methyl propane sodium sulfonate in distilled water, and adjusting the pH value to 6-7 to obtain a solution I;
(2) and under the protection of nitrogen, heating to 75-85 ℃, adding styrene and butyl acrylate into the solution I, stirring for reaction for 0.5-1h, adding an initiator, and continuously stirring for 2-4 h to obtain the product.
3. The method for preparing a non-foaming oil well cement latex fluid loss additive according to claim 2, wherein the initiator is a mixture of potassium persulfate and sodium bisulfite in a mass ratio of 1: 1.
4. The method for preparing the non-foaming oil well cement latex fluid loss agent according to claim 2, wherein the addition amount of the initiator is 1.5-2% of the total mass of the comonomer.
5. The method for preparing a non-foaming oil well cement latex fluid loss additive according to claim 2, wherein in the step (1), the addition amount of the distilled water is 2.5-3.5 times of the total mass of the comonomer.
6. The method for preparing a non-foaming oil well cement latex fluid loss additive according to claim 2, wherein in the step (1), the pH is adjusted by using sodium hydroxide solution, and the concentration of the sodium hydroxide solution is 0.5 mol/L.
7. Use of a non-foaming oil well cement latex fluid loss additive of claim 1 in thixotropic cement slurries and phosphoaluminate cement slurries.
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