CN111139039B - Sulfonated phenolic resin graft modified polymer filtrate reducer and preparation method thereof - Google Patents
Sulfonated phenolic resin graft modified polymer filtrate reducer and preparation method thereof Download PDFInfo
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Abstract
The invention provides a sulfonated phenolic resin graft modified polymer fluid loss agent and a preparation method thereof. The sulfonated phenolic resin graft modified polymer filtrate reducer comprises 100 parts by weight of water, 5-30 parts by weight of sulfonate polymer, 2-30 parts by weight of sulfonated phenolic resin and 0.6-10 parts by weight of cross-linking agent. The sulfonated phenolic resin graft modified polymer fluid loss additive has the advantages of easily available raw materials and simple synthesis process, can be applied to a high-density drilling fluid system, resists the temperature up to 220 ℃, has low viscosity effect and good fluid loss reducing effect, can resist saturated salt with a single agent, and is favorable for ensuring the performance of the drilling fluid in the deep ultra-high temperature and high pressure stratum environment.
Description
Technical Field
The invention relates to the field of drilling fluid, in particular to a sulfonated phenolic resin graft modified polymer fluid loss additive and a preparation method thereof, which are used for controlling the fluid loss of an ultrahigh-temperature high-density drilling fluid system.
Background
With the increasing world energy demand, the drilling target gradually turns to the deep stratum, and in the drilling process of the deep stratum, the probability of drilling the stratum with ultrahigh temperature and high pressure is increased. In the areas of America, North sea and the like, the bottom hole temperature is often over 200 ℃, the bottom hole maximum pressure is over 110MPa, and the drilling fluid density during drilling reaches 2.22g/cm 3The above; in the domestic south-sea Yingqiong basin, the ground temperature gradient is high, the formation pressure is abnormally high, the maximum temperature of the bottom of a drilled well reaches 249 ℃, and the maximum drilling fluid density is 2.14g/cm3. The polymer fluid loss additive can effectively control the fluid loss of the drilling fluid and can ensure the good performance of the conventional density drilling fluid. However, when the polymer filtrate reducer is used for high-density and ultrahigh-density drilling fluid in a deep ultrahigh-temperature and high-pressure stratum environment, the conventional polymer filtrate reducer is high in molecular weight, so that the problems that the viscosity and shear strength of the drilling fluid are increased, the quality of a filter cake is poor, the high-temperature and high-pressure filtrate loss is difficult to control and the like are easily caused, and the underground complexity is easily caused.
The filter loss reducing agents such as the ultra-low viscosity CMC, the ultra-low viscosity PAC and the like applied on site at present can rapidly increase the viscosity and the shear force and deteriorate the fluidity even if the addition amount of the filter loss reducing agents is small in the ultra-high density drilling fluid. The common filtrate reducer SMP, viscosity reducer SMC and SMK on site, and both of the two have modified products and the like, and under the conditions of high solid phase and high salinity, the common filtrate reducer SMP, the viscosity reducer SMC and the SMK need to be compounded for use, and the dosage needs to be added, so that the cost of the drilling fluid is increased, the labor intensity is increased, and the temperature and salt resistance is poor. Temperature-resistant and salt-resistant filtrate reducers based on sulfonated polymers are available in foreign countries, but no treating agent suitable for ultrahigh-temperature and high-density conditions is available.
The sulfonate polymer fluid loss additive has a good fluid loss reducing effect in fresh water and salt water, and a salt-tolerant fluid loss additive is obtained by copolymerizing N, N-dimethylacrylamide, dimethyldiallylammonium chloride, N-vinylpyrrolidone and 2-acrylamide-2-methylpropanesulfonic acid in the document 'development of a DMAA/AMPS/DMDAAC/NVP quaternary copolymerization temperature-tolerant salt-tolerant drilling fluid loss additive' (oilfield chemistry, 34(1), 2017), and is expected to be used in a high-temperature and high-salt stratum. However, the filtration loss only examines the filtration loss reduction performance of fresh water and salt water under the condition of 150 ℃, and the using effect under ultrahigh temperature and high density is not proved.
In the literature, "synthesis and performance evaluation of high-temperature resistant supramolecular fluid loss additives" (drilling fluid and completion fluid, 2017, 34, vol.2) AMPS, AM and N-vinyl pyrrolidone (NVP) are used as monomers to synthesize the ternary polymerization supramolecular fluid loss additive. The supermolecule fluid loss additive has the capability of rapidly adapting to environmental change due to strong intermolecular force, and shows good temperature resistance, salt resistance and calcium resistance. The raw materials of the fluid loss agent are three reaction monomers, and the fluid loss agent is not proved to be suitable for the conditions of ultrahigh temperature and high density.
In the literature, "synthesis of comb-shaped polymer fluid loss additive and application thereof in deep well brine drilling fluid" (drilling fluid and completion fluid, 2017, 34, vol. 1), allyl polyoxyethylene ether 400, acrylamide and 2-acrylamido-2-methylpropanesulfonic acid are used as monomers, and a colorless, transparent and viscous liquid comb-shaped polymer fluid loss additive DMP-1 is synthesized by an aqueous solution polymerization method, and the effective content of the polymer fluid loss additive DMP-1 is 30%. The viscosity reduction rate of the filtrate reducer aqueous solution after high-temperature aging at 180 ℃ is less than 42.0 percent, the temperature resistance reaches 200 ℃, the salt resistance reaches saturation, and the calcium chloride resistance reaches 3 percent. The fluid loss additive is of a comb-shaped structure, and the raw materials are three reaction monomers, so that the fluid loss additive is not proved to be suitable for a high-density drilling fluid system.
In the literature, "synthesis and evaluation of a novel high-temperature resistant graphene oxide filtrate reducer" (drilling fluid and completion fluid, 2017, 34, vol. 4), graphene oxide/polymer filtrate reducer GOJ is prepared by copolymerizing Graphene Oxide (GO) with Acrylamide (AM), 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), dimethyldiallylammonium chloride (DMDAAC), and Vinyl Acetate (VAC). The fluid loss reducing, temperature resisting and salt resisting performances are excellent, but one of the raw materials is graphene oxide, so that the cost is high, and the fluid loss reducing, temperature resisting and salt resisting performances are not proved to be suitable for a high-density drilling fluid system.
In the literature, "synthesis and performance test of temperature-resistant salt-tolerant filtrate reducer" (master's academic paper, china university of petroleum 2015), 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), Acrylamide (AM) and Itaconic Acid (IA) are used as monomers to react to obtain a terpolymer AAI type temperature-resistant salt-tolerant filtrate reducer, the temperature resistance in saline base slurry can reach 180 ℃, and after the filtrate reducer is added, the filtrate loss is obviously reduced and the reduction percentage is over 80%, which indicates that the filtrate reducer has good temperature-resistant salt-tolerant performance; the terpolymer AAS type temperature-resistant salt-tolerant filtrate reducer obtained by taking Sodium Styrene Sulfonate (SSS), AMPS and AM as monomers through reaction can resist the temperature of 220 ℃ in saline-based slurry, and after the filtrate reducer is added, the filtrate reducer is obviously reduced, and the reduction percentage is over 90 percent, so that the filtrate reducer has excellent temperature-resistant salt-tolerant performance. The two filtrate reducers are both monomer reaction polymers, and are not proved to be suitable for a high-density drilling fluid system.
The patent 'a high-temperature high-salt fluid loss additive for drilling fluid and a preparation method thereof' (the publication number is CN 102559156B) provides a fluid loss additive which is obtained by copolymerization of acrylamide, acrylic acid and alkyl sulfonate containing acryloyloxy, and has better fluid loss reducing property under the conditions of high temperature and high salt. However, the fluid loss additive is a sulfonate polymer, a continuous benzene ring structure is not found in a main chain and a side chain, and the performance of the fluid loss additive in high-density drilling fluid is not tested.
The patent 'manufacturing method of carboxymethyl sulfonated phenolic resin and application of carboxymethyl phenolic resin' (application publication number CN106608958A) provides a novel carboxymethyl sulfonated phenolic resin, and the dosage of a treating agent is reduced while the temperature and salt resistance of the drilling fluid is maintained. However, the carboxymethyl sulfonated phenolic resin has a single component and only contains a carboxymethyl modified sulfonated phenolic resin structure.
The patent "fluid loss additive for high temperature resistant oil field drilling fluid and preparation method (CN 201410381728)" provides a fluid loss additive for oil field drilling fluid and preparation method thereof, and application of the treating agent. The filtrate reducer is prepared by taking lignin, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid as synthetic monomers, grafting and copolymerizing the lignin, the acrylamide and the 2-acrylamide-2-methylpropanesulfonic acid under respective initiation of potassium persulfate, ammonium ferrous sulfate hexahydrate and hydrogen peroxide, and adding a cross-linking agent N, N-methylene bisacrylamide to enhance the stability of the filtrate reducer under a high-temperature condition, so that a novel high-temperature-resistant filtrate reducer is synthesized. The filtrate reducer contains lignin, is formed by polymerization of lignin and two monomers, and does not contain a continuous benzene ring structure in a molecular structure.
The patent "polymer salt-resistant high-temperature-resistant fluid loss additive for drilling fluid and preparation method thereof (CN 201610976197)" provides a polymer salt-resistant high-temperature-resistant fluid loss additive for drilling fluid and preparation method thereof. The fluid loss agent is prepared from the following components in parts by weight: 220 parts of distilled water 180-one materials, 15-20 parts of starch, 20-25 parts of konjaku flour, 2-5 parts of sodium hydroxide, 25-30 parts of sodium propylene sulfonate, 0.3-0.8 part of DMDAAC10, 0.3-0.8 part of N, N-methylene bisacrylamide, 3-10 parts of N-vinyl pyrrolidone and 0.5-1.5 parts of initiator, has good thermal stability, can resist the temperature to 180 ℃, and has good calcium and magnesium resistance. The filtrate reducer contains starch and konjaku flour as natural materials, and the whole filtrate reducer resists the temperature of 180 ℃. But there is no data for high density drilling fluids.
The patent "high temperature resistant salt tolerant filtrate reducer for drilling fluid (CN 201410484065)" provides a high temperature resistant salt tolerant filtrate reducer for drilling fluid, which is prepared by copolymerizing three monomers, namely acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and itaconic acid, by adopting an emulsion polymerization method to obtain a copolymer, hydrolyzing the copolymer under an alkaline condition, precipitating and drying the copolymer to obtain the filtrate reducer. The drilling fluid has good fluid loss reducing effect in fresh water, salt water, compound salt water and saturated salt water drilling fluid systems. An emulsion polymerization process is also provided. The fluid loss agent is prepared by polymerizing three monomers in an emulsion mode, experimental data are only 200 ℃ and conventional density data, and the using effect under the condition of higher temperature or high density cannot be proved.
The patent US9243180B2 provides a drilling fluid loss additive, the raw materials are lignite, formaldehyde, polymer and the like, the reaction temperature is 180 ℃ and 220 ℃, and the effect of low viscosity is achieved.
None of the above fluid loss additives is visible for use under ultra-high temperature high density conditions. In summary, the system density is 2.0g/cm at a bottom hole temperature of 220 ℃ or above3Even higher drilling fluid, the polymer filtrate reducer in the prior art has high relative molecular weight, which brings tackifying effect, and the insufficient capability of resisting ultra-high temperature and salt of the sulfonated phenolic resin as the existing high-temperature and high-pressure filtrate reducer still needs to be solved urgentlyAnd (5) problems are solved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a sulfonated phenolic resin graft modified polymer fluid loss additive and a preparation method thereof.
The invention aims to provide a sulfonated phenolic resin graft modified polymer fluid loss additive, which is a fluid loss additive with a good fluid loss effect and is suitable for ultrahigh-temperature high-density drilling fluid.
The sulfonated phenolic resin graft modified polymer fluid loss agent is prepared from the following raw materials in parts by weight:
preferably, the sulfonate polymer is a copolymer with the sulfonic acid group chain link content of more than 30% and the molecular weight of less than 30 ten thousand in a molecular chain, and more preferably, the sulfonic acid group chain link content is 30% -50% and the molecular weight is 15-25 ten thousand.
The sulfonate polymer is preferably the sulfonate polymer described in application document CN201110294876.8 (a low molecular weight polymer type fluid loss additive for drilling fluid and a preparation method thereof).
Preferably, the sulfonated phenolic resin is at least one selected from sulfomethyl phenolic resin, sulfonated polyoxyethylene phenol ether phenolic resin, sulfonated-3-phenoxy-2-hydroxypropyl trimethyl ammonium chloride phenolic resin or sulfonated phenoxyacetic phenolic resin.
The cross-linking agent is selected from cross-linking agents commonly used in the field, and is preferably at least one of formaldehyde, acetaldehyde, glyoxal, N-methylene-bisacrylamide or polyethylene glycol diacrylate.
The second purpose of the invention is to provide a preparation method of the sulfonated phenolic resin graft modified polymer fluid loss additive, which takes sulfonate polymer and sulfonated phenolic resin as reaction raw materials to react under the action of a cross-linking agent to obtain the fluid loss additive.
The preparation method specifically comprises the following process steps:
(1) dissolving the sulfonate polymer in water, and uniformly stirring;
(2) adding the sulfonated phenolic resin into the polymer solution obtained in the step (1), and uniformly stirring;
(3) adding a cross-linking agent under the stirring condition, stirring at room temperature for 10-60 min, transferring to a closed container, introducing nitrogen, heating to 60-100 ℃, and reacting for 1-6 h to obtain the filtrate reducer.
Preferably, the preparation method further comprises the following steps:
(4) and (4) carrying out spray drying on the liquid product after the reaction in the step (3) is finished to obtain the fine and uniform powdery filtrate reducer.
The sulfonated phenolic resin graft modified polymer fluid loss agent has the advantages of easily obtained raw materials and simple synthesis process, and molecules contain continuous rigid benzene ring structures and a large number of large-volume sulfonic acid group structures, so that a large number of adsorption sites and hydration dispersibility are ensured, and the temperature and salt resistance is effectively improved. The single agent resists the temperature up to 220 ℃ and resists the salt to reach saturation; the fluid loss reducing effect is good in the ultra-high temperature high-density drilling fluid, the viscosity effect is low, the temperature resistance reaches 220 ℃, and the fluid loss reducing effect can be 2.3g/cm3Used at the density.
The sulfonated phenolic resin graft modified polymer fluid loss additive can be applied to a high-density drilling fluid system, the temperature resistance reaches 220 ℃, the viscosity effect is low, the fluid loss reducing effect is good, and a single agent can resist saturated salt.
The filtrate reducer provided by the invention is simple in preparation process, excellent in temperature resistance and salt resistance, beneficial to guaranteeing the performance of drilling fluid in deep ultrahigh-temperature and high-pressure stratum environment, and good in development prospect.
Detailed Description
The present invention will be further described with reference to the following examples.
The raw materials used in the examples were as follows:
sulfonate polymer: PFL-L, China petrochemical Petroleum engineering technical research institute, Industrial products, molecular weight 20 ten thousand, chain segment content 45%.
Sulfomethyl phenolic resin: SMP-2, Chongqing Daqi oilfield chemical Co., Ltd., Industrial products.
Sulfonated polyoxyethylene phenol ether phenol resin: the self-made synthesis is that formaldehyde, phenol, sodium bisulfite, polyoxyethylene alkylphenol ether and sodium sulfite are polymerized under the condition that sodium hydroxide is used as a catalyst and a pH regulator.
Sulfonated-3-phenoxy-2-hydroxypropyl trimethylammonium chloride phenol formaldehyde resin: hebei Huayun hong Industrial chemical Co., Ltd, industrial products.
Sulfonated phenoxyacetic acid phenolic resin: the self-made formaldehyde adhesive is prepared by carrying out copolymerization reaction on formaldehyde, phenol, sodium bisulfite and sodium bisulfite, then carrying out grafting reaction on the obtained product and glycolic acid under an alkaline condition, and carrying out ethanol treatment.
Bentonite: bohai sea drilling fluid experimental soil and industrial products.
Dispersing agent: SMS-19, China Petroleum engineering technology research institute, Industrial products.
Low viscosity PAC 1.5%: zibo technology chemical Co., Ltd, industrial products.
Sulfonated lignite: yunnan Jinsida chemical Co., Ltd, industrial products.
Lignite resin: yunnan Jinsida chemical Co., Ltd, industrial products.
Sulfonated asphalt: shandongde Shunshua chemical Co., Ltd.
Barite: industrial product, Longteng mining Co., Ltd, Kaili, Guizhou, having a density of 4.32g/cm3。
And others: it is commercially available.
Examples 1 to 5: preparation of filtrate reducer
Example 1:
dissolving 5 parts of sulfonate polymer in 100 parts of water, and uniformly stirring; adding 5 parts of sulfomethyl phenolic resin into the polymer solution, and uniformly stirring; adding 0.6 part of formaldehyde under the stirring condition, stirring at room temperature for 15min, transferring to a closed container, introducing nitrogen, heating to 60 ℃, and reacting for 2h to obtain the sulfonated phenolic resin graft modified polymer filtrate reducer A.
Example 2:
dissolving 15 parts of sulfonate polymer in 100 parts of water, and uniformly stirring; adding 5 parts of sulfonated polyoxyethylene phenol ether phenolic resin into the polymer solution, and uniformly stirring; adding 1.2 parts of glyoxal under the stirring condition, stirring for 15min at room temperature, transferring to a closed container, introducing nitrogen, heating to 60 ℃, and reacting for 4h to obtain the sulfonated phenolic resin graft modified polymer filtrate reducer B.
Example 3:
dissolving 10 parts of sulfonate polymer in 100 parts of water, and uniformly stirring; adding 10 parts of sulfomethyl phenolic resin into the polymer solution, and uniformly stirring; adding 2.4 parts of formaldehyde under the stirring condition, stirring at room temperature for 30min, transferring to a closed container, introducing nitrogen, heating to 90 ℃, and reacting for 4h to obtain the sulfonated phenolic resin graft modified polymer filtrate reducer C.
Example 4:
dissolving 15 parts of sulfonate polymer in 100 parts of water, and uniformly stirring; adding 5 parts of sulfonated phenoxyacetic acid phenolic resin into the polymer solution, and uniformly stirring; adding 2.4 parts of N, N-methylene bisacrylamide under the stirring condition, stirring at room temperature for 30min, transferring to a closed container, filling nitrogen, heating to 80 ℃, and reacting for 3h to obtain the sulfonated phenolic resin graft modified polymer filtrate reducer D.
Example 5:
dissolving 30 parts of sulfonate polymer in 100 parts of water, and uniformly stirring; adding 20 parts of sulfonated-3-phenoxy-2-hydroxypropyl trimethyl ammonium chloride phenolic resin into the polymer solution, and uniformly stirring; adding 3 parts of polyethylene glycol diacrylate under the stirring condition, stirring at room temperature for 10min, transferring to a closed container, introducing nitrogen, heating to 80 ℃, and reacting for 2h to obtain the sulfonated phenolic resin graft modified polymer filtrate reducer E.
Example 6: evaluation of filtrate reducer Performance
Apparent viscosity measurement of 1% aqueous solution: 4g of the filtrate reducer was weighed and slowly added to 400ml of distilled water with stirring to dissolve the filtrate reducer completely. And (5) sealing and maintaining for 24 hours at room temperature, measuring the reading at 600r/min by using a flow rate rotary viscometer, and calculating according to the following formula.
AV＝φ600/2
In which AV-apparent viscosity, unit millipascal-seconds (mPa · s);
φ 600-reading at 600r/min rotational viscometer.
And (3) measuring the filtration loss: 350ml of distilled water is measured and placed in a high-speed stirring cup, 0.42g of anhydrous sodium carbonate is added, 7.0g of sodium bentonite for drilling fluid experiments is added under stirring, the mixture is stirred at high speed for 20min, and the mixture is sealed and maintained for 24 hours at 25 ℃. Adding 10.5g of sulfonated lignite under stirring, stirring at a high speed for 5min, adding 10.5g of fluid loss additive under stirring, stirring at a high speed for 20min, adding 105g of sodium chloride under stirring, stirring at a high speed for 20min, and sealing and maintaining at 25 ℃ for 2-4 h. Then rolling for 16h at 220 ℃, cooling to 25 ℃, adding 7g of anhydrous sodium carbonate, stirring at high speed for 5min, measuring the API filtration loss under the conditions of 25 ℃ and 0.7MPa according to the specification of 7.2 in GB/T16783.1, and measuring the high-temperature high-pressure filtration loss under the conditions of 180 ℃ and 3.45MPa according to the specification of 7.3.
The results of the performance measurements of the single filtrate reducers prepared in examples 1 to 5 are shown in Table 1.
TABLE 1 filtrate reducer Single agent Performance test results
| Filtrate reducer | A | B | C | D | E |
| Apparent viscosity of 1% aqueous solution, mPas | 10 | 12.5 | 14 | 15 | 15 |
| API fluid loss, mL | 2.6 | 2.8 | 2.2 | 2.2 | 3 |
| High temperature high pressure filtration loss, mL | 18 | 18.2 | 15 | 16.8 | 17 |
According to the measurement result, the apparent viscosity of the 1% aqueous solution of the prepared sulfonated phenolic resin graft modified polymer fluid loss additive is less than 15mPa & s, and the viscosity is not easy to increase in the high-density drilling fluid due to low viscosity. After the filtrate reducer is subjected to hot rolling in saturated salt water slurry at 220 ℃ for 16 hours, the API (American Petroleum institute) filtrate loss is less than 3mL, and the high-temperature high-pressure filtrate loss at 180 ℃ and under 3.45MPa is less than 19mL, which shows that the filtrate reducer has excellent temperature and salt resistance.
Example 7: performance evaluation of filtrate reducer in high-density drilling fluid system
The sulfonated phenolic resin graft modified polymer fluid loss agent C prepared in the example 3 is used as one of the components, and the preparation density is 2.30g/cm3The drilling fluid takes 100mL of water as a solute, and comprises the following components in percentage by weight:
2% of bentonite, SMS-193% of dispersant and sulfonated phenolic resin0.5% of branch modified polymer filtrate reducer C, 1.5% of low-viscosity PAC, 3% of sulfonated lignite, 2% of lignite resin, 2% of white oil, 800.5% of Span, 3% of sulfonated asphalt and 0.5% of sodium hydroxide. Adding the components into 350mL of water in sequence, and then adding 1120g of barite to obtain fresh water weighted slurry; then 35g of sodium chloride and 1120g of barite are added to obtain 10 percent brine weighted slurry, and the actual density of the barite is up to 2.3g/cm measured by densimeter3The standard is. Placing the prepared slurry in a high-temperature aging tank, rolling for 16h at 220 ℃, cooling to 55 ℃, stirring at high speed for 5min, measuring the API filtration loss under the conditions of 25 ℃ and 0.7MPa according to the specification of 7.2 in GB/T16783.1, and measuring the high-temperature high-pressure filtration loss under the conditions of 180 ℃ and 3.45MPa according to the specification of 7.3.
The results of the fluid loss additive C performance measurements in the high density drilling fluid system of example 3 are shown in table 2.
TABLE 2 measurement results of high density drilling fluid system performance
According to the measurement result, after the high-density drilling fluid prepared from the sulfonated phenolic resin graft modified polymer fluid loss agent is subjected to hot rolling at 220 ℃ for 16 hours, the highest API (American petroleum institute) fluid loss is 4.2mL, and the high-temperature high-pressure fluid loss under the conditions of 180 ℃ and 3.45MPa is less than 12mL, which shows that the fluid loss agent has good temperature resistance and salt resistance in a high-density system.
Claims (5)
1. The sulfonated phenolic resin graft modified polymer fluid loss agent is characterized by being prepared from the following raw materials in parts by weight:
100 parts by weight of water;
5-30 parts of a sulfonate polymer;
2-30 parts by weight of sulfonated phenolic resin;
0.6-10 parts by weight of a crosslinking agent;
the sulfonate polymer is a copolymer with 30-50% of sulfonic acid group chain link content and 15-25 ten thousand of molecular weight in a molecular chain; the sulfonated phenolic resin is at least one of sulfomethyl phenolic resin, sulfonated polyoxyethylene phenol ether phenolic resin, sulfonated-3-phenoxy-2-hydroxypropyl trimethyl ammonium chloride phenolic resin or sulfonated phenoxyacetic acid phenolic resin.
2. The fluid loss additive according to claim 1, wherein the fluid loss additive is prepared from raw materials comprising the following components in parts by weight:
100 parts by weight of water;
5-15 parts of a sulfonate polymer;
5-20 parts by weight of sulfonated phenolic resin;
1.2-4 parts by weight of a crosslinking agent.
3. Fluid loss additive according to claim 1 or 2, characterized in that:
the cross-linking agent is selected from at least one of formaldehyde, acetaldehyde, glyoxal, N-methylene bisacrylamide or polyethylene glycol diacrylate.
4. Fluid loss additive according to claim 1, characterized in that it is prepared by the following steps:
the filtrate reducer is obtained by taking a sulfonate polymer and sulfonated phenolic resin as reaction raw materials and reacting under the action of a cross-linking agent.
5. The preparation method of the sulfonated phenolic resin graft modified polymer fluid loss additive according to any one of claims 1 to 4, characterized by comprising the following steps:
(1) dissolving the sulfonate polymer in water, and uniformly stirring;
(2) adding the sulfonated phenolic resin into the polymer solution obtained in the step (1), and uniformly stirring;
(3) Adding a cross-linking agent under the stirring condition, stirring at room temperature for 10-60 min, transferring to a closed container, introducing nitrogen, heating to 60-100 ℃, and reacting for 1-6 h to obtain the filtrate reducer.
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