CN112210059A

CN112210059A - Biomass synthetic resin filtrate reducer, preparation method thereof and water-based drilling fluid filtrate reducer

Info

Publication number: CN112210059A
Application number: CN201910631818.6A
Authority: CN
Inventors: 周启成; 单海霞; 位华; 周亚贤; 张弌; 侯树刚
Original assignee: Sinopec Oilfield Service Corp; Sinopec Zhongyuan Petroleum Engineering Co Ltd; Drilling Engineering Technology Research Institute of Sinopec Zhongyuan Petroleum Engineering Co Ltd
Current assignee: Sinopec Oilfield Service Corp; Sinopec Zhongyuan Petroleum Engineering Co Ltd; Drilling Engineering Technology Research Institute of Sinopec Zhongyuan Petroleum Engineering Co Ltd
Priority date: 2019-07-12
Filing date: 2019-07-12
Publication date: 2021-01-12

Abstract

The invention provides a biomass synthetic resin filtrate reducer which has a structure shown in a formula I, wherein n is an integer of 15-22. The invention provides a preparation method of a biomass synthetic resin filtrate reducer, which comprises the following steps: mixing furfuryl alcohol, furfural, sodium pyrosulfite, anhydrous sodium sulfite and water to obtain the biomass synthetic resin filtrate reducer. The product provided by the invention has good filtrate loss reduction performance, strong salt resistance and biodegradability; the preparation method of the biomass synthetic resin filtrate reducer is environment-friendly, mild and simple, and has low application cost.

Description

Biomass synthetic resin filtrate reducer, preparation method thereof and water-based drilling fluid filtrate reducer

Technical Field

The invention relates to the technical field of petroleum drilling fluid additives, in particular to a biomass synthetic resin filtrate reducer, a preparation method thereof and a water-based drilling fluid filtrate reducer.

Background

The filtrate reducer is one of the important treating agents of the drilling fluid, and plays an important role in stabilizing the well wall and protecting an oil-gas layer. With the continuous development of the petroleum industry, the continuous complexity of the stratum and the influence of the high-temperature environment of deep wells and ultra-deep well deep strata, the petroleum industry has higher and higher requirements on the filtrate reducer, and the filtrate reducer which is a natural product, mostly has a rigid long chain and a wide source but does not resist high temperature, has the characteristics of temperature resistance, salt resistance and biodegradability, and becomes the main direction of research.

The sulfonated phenolic resin has excellent high-temperature stability and thermal stability (less than 180 ℃), is a filtrate reducer product which is most widely applied at home and abroad and difficult to replace, and is almost suitable for various drilling fluid systems. However, with the severe environmental conditions, the following problems arise in the product: (1) the degradability is poor. The sulfonated phenolic resin is mainly prepared from formaldehyde and phenol, and the structure of the sulfonated phenolic resin contains benzene rings, so that although the sulfonated phenolic resin is non-toxic, the sulfonated phenolic resin has poor biodegradability, and the application of the sulfonated phenolic resin is limited in some areas with higher environmental protection requirements; (2) the residual phenol has a certain toxicity. Residual phenol and oligophenol in the production process of the phenolic resin have certain toxicity (phenol is listed in the national hazardous chemical list), and although many means and measures are adopted, the residual phenol and oligophenol are still difficult to completely remove. Therefore, the filtrate reducer with good degradability and green production process is researched, and has important significance for well wall stability and oil layer protection of oil and gas well engineering.

Disclosure of Invention

In view of the above, the invention aims to provide a biomass synthetic resin fluid loss additive, a preparation method thereof and a water-based drilling fluid loss additive.

The invention provides a biomass synthetic resin filtrate reducer, which has a structure shown in formula I:

in the formula I, n is an integer of 15-22.

In the present invention, n is preferably 18 to 20.

The invention provides a preparation method of a biomass synthetic resin filtrate reducer, which comprises the following steps:

1) sequentially mixing furfuryl alcohol, water and furfural to obtain a first mixture;

2) mixing the first mixture with sodium metabisulfite to obtain a second mixture;

3) mixing the second mixture with sodium sulfite to obtain a third mixture;

4) heating the third mixture to obtain a fourth mixture;

5) and mixing the fourth mixture with water to obtain the biomass synthetic resin filtrate reducer.

The furfuryl alcohol, furfural and sodium metabisulfite are not particularly limited in the present invention, and those having the above-mentioned components well known to those skilled in the art may be used and commercially available. In the present invention, the sodium sulfite is preferably anhydrous sodium sulfite. In the invention, the mass ratio of furfuryl alcohol, water (water in step 1), furfural, sodium metabisulfite, sodium sulfite and water (water in step 5) is preferably (80-100): (1-2): (100-200): (20-60): (20-60): (16-26), more preferably (85-95): (1.2-1.8): (120-180): (30-50): (30-50): (18-22), most preferably 90: (1.4-1.6): (140-160): (35-45): (35-45): 20.

the preparation equipment of the biomass synthetic resin filtrate reducer is not particularly limited, and a person skilled in the art can select appropriate equipment to prepare the filtrate reducer according to actual conditions, for example, a four-port reaction kettle can be adopted to prepare the filtrate reducer.

In the present invention, the method of mixing in step 1) is preferably:

adding furfuryl alcohol, water and furfural in sequence for mixing to obtain a first mixture.

In the invention, the mixing in the step 1) is carried out under the condition of stirring, and the stirring speed is preferably 250-300 rpm, more preferably 260-290 rpm, and most preferably 270-280 rpm; the mixing time in the step 1) is preferably 10-20 min, more preferably 12-18 min, and most preferably 14-16 min.

In the invention, furfuryl alcohol can be mixed with water in any proportion at room temperature, the solubility of furfural in water is 8.3%, but the solubility of furfural is gradually increased along with the increase of temperature, a small amount of water is added after the furfuryl alcohol is added, so that the furfuryl alcohol can be dissolved, the furfural is dissolved only in a small amount, and then the furfural is gradually dissolved and participates in reaction along with the gradual increase of temperature and the continuous addition of water in the synthesis process, so that the aim of homogeneous reaction is fulfilled.

In the present invention, the method for mixing in step 2) is preferably:

adding sodium pyrophosphite into the first mixture in batches, and mixing to obtain a second mixture.

In the invention, the batch is preferably 4-5 times; the adding amount of each batch is preferably 1/4-1/5 of the total amount of sodium pyrophosphite; the mixing time after each addition in a batch is preferably 10-20 min, more preferably 12-18 min, and most preferably 14-16 min.

In the present invention, the mixing in step 2) is preferably performed under stirring conditions, and the stirring speed is preferably 250 to 300rpm, more preferably 260 to 290rpm, and most preferably 270 to 280 rpm.

In the invention, the purpose of adding sodium metabisulfite in small amount in multiple times is to better mix evenly and provide time for the hydrolysis of sodium metabisulfite to generate sodium bisulfite, which is an important sulfonating agent in the invention.

In the present invention, the method for mixing in step 3) is preferably:

sodium sulfite is added to the second mixture in portions and mixed to obtain a third mixture.

In the invention, the number of times of batching is preferably 4-5 times; the addition amount of each batch is preferably 1/4-1/5 of the total amount of sodium sulfite; the mixing time after each addition in a batch is preferably 10-20 min, more preferably 12-18 min, and most preferably 14-16 min.

In the invention, the first addition of sodium sulfite starts the sulfonation reaction, the sulfonation reaction is an exothermic reaction, and the addition time of sodium sulfite is preferably controlled to be 30min for ensuring the continuous and stable reaction.

In the present invention, the mixing in step 3) is preferably performed under stirring conditions, and the stirring speed is preferably 250 to 300rpm, more preferably 260 to 290rpm, and most preferably 270 to 280 rpm.

The purpose of adding a small amount of sodium sulfite for multiple times is preferably to better mix evenly and effectively control the hydrolysis speed of the anhydrous sodium sulfite, and the anhydrous sodium sulfite is hydrolyzed to generate sodium bisulfite, provide sulfonated groups and release hydroxide radicals, thereby playing a role in maintaining the pH of a reaction system.

In the present invention, the method of the temperature raising treatment in the step 4) is preferably:

and firstly heating the third mixture for the first time and then heating for the second time to obtain a fourth mixture.

In the invention, the temperature of the primary heating is preferably 60-70 ℃, more preferably 62-68 ℃, and most preferably 64-66 ℃; the time for the heat preservation of the primary temperature rise, that is, the time for the heat preservation after the temperature rise to the primary temperature rise, is preferably 30 to 40min, more preferably 32 to 38min, and most preferably 34 to 36 min. In the present invention, the sulfonation is carried out at one time of temperature rise.

In the invention, the temperature of the secondary heating is preferably 95-105 ℃, more preferably 97-103 ℃, and most preferably 99-101 ℃; the time for the secondary heating, that is, the time for heating to the temperature for the secondary heating and then performing the heat preservation, is preferably 20 to 60min, more preferably 30 to 50min, and most preferably 35 to 45 min. In the present invention, the secondary temperature rise is a condensation reaction.

In the present invention, the temperature raising treatment is preferably performed under stirring conditions, and the stirring speed is not particularly limited, and may be adjusted according to the viscosity of the system so that a phenomenon in which a slight vortex is visible can occur; the stirring speed is preferably 250-300 rpm, more preferably 260-290 rpm, and most preferably 270-280 rpm.

In the present invention, the method for mixing in the step 5) is preferably:

and adding water into the fourth mixture in batches, and mixing to obtain the biomass synthetic resin filtrate reducer.

In the invention, the number of times of batching is preferably 4-6 times, and more preferably 5 times; the addition amount of each batch is preferably 1/4-1/6 of the total amount of water, and more preferably 1/5; the time interval of each water addition of the batches is preferably 20-30 min, more preferably 22-28 min, and most preferably 24-26 min. In the invention, after water is added in batches, the obtained mixture is preferably discharged after standing to obtain the biomass synthetic resin filtrate reducer; the standing time is preferably 60-90 min, more preferably 65-85 min, and most preferably 70-80 min.

The invention has the function of adding water in the synthesis process to control the viscosity of the system so as to obtain the biomass synthetic resin fluid loss agent with better fluidity, and is convenient for field use.

In the present invention, the mixing in step 5) is preferably performed under stirring conditions, and the stirring speed is preferably 250 to 300rpm, more preferably 260 to 290rpm, and most preferably 270 to 280 rpm.

The preparation method of the filtrate reducer of biomass synthetic resin provided by the invention takes furfuryl alcohol and furfural as raw materials, adopts a production process of 'one-pot boiling' and polycondensation, and has no three wastes in the whole production process, solves the problems of free phenol, residual aldehyde and the like in the prior art for synthesizing phenolic resin, and eliminates potential harm to human bodies and the like caused by volatilization of the raw materials. The preparation method of the biomass synthetic resin filtrate reducer provided by the invention has the advantages of simplicity, convenience, mild conditions, easiness in operation, no toxicity in the preparation process, high efficiency and environmental friendliness.

The invention takes furfuryl alcohol, furfural and sulfite as main reaction raw materials to prepare the biomass synthetic resin filtrate reducer, and the reaction is shown as formula 1-formula 3: ,

Na₂SO₃+H₂O→NaHSO₃+ NaOH formula 1;

the biomass synthetic resin filtrate reducer still has alcoholic hydroxyl active groups after synthesis, the viscosity of a terminal product can be controlled by adjusting the reaction temperature and the reaction time, and under the condition of low temperature, the product can further react due to the existence of alcoholic hydroxyl, so that the functions of tackifying and reducing water loss are achieved; under the high temperature condition, ether bonds in the product are easy to break, the effect of reducing viscosity is achieved, the drilling fluid system is ensured not to generate thickening phenomenon, the rheological property of the whole system is not influenced, and the water solubility and the salt resistance of the biomass synthetic resin can be improved by introducing the sulfonated groups.

The invention provides a water-based drilling fluid filtrate reducer, which comprises the biomass synthetic resin filtrate reducer in the technical scheme or the biomass synthetic resin filtrate reducer prepared by the method in the technical scheme. In the invention, the biomass synthetic resin fluid loss additive is particularly suitable for being used as a water-based drilling fluid loss additive.

The molecular weight range of the biomass synthetic resin filtrate reducer provided by the invention is 3 multiplied by 10³～4×10³(ii) a The biomass synthetic resin fluid loss additive is a brownish red viscous liquid in appearance, and a 5% aqueous solution based on dry basis is a light reddish brown transparent liquid. The biomass synthetic resin filtrate reducer has dry basis mass fraction of more than or equal to 42 percent, cloud point salinity of more than or equal to 100g/L and high-temperature and high-pressure filtration loss of less than or equal to 180 DEG C25mL, and the apparent viscosity is less than or equal to 30 mPa.s.

Compared with the prior art, the biomass synthetic resin filtrate reducer provided by the invention is green and environment-friendly, has excellent temperature resistance and salt resistance, and is a filtrate reducer for water-based drilling fluid with wide adaptability; the synthetic material of the filtrate reducer is natural biomass, and has wide source, low price and good environmental compatibility; and the preparation process of the filtrate reducer is environment-friendly, mild and simple, has no three wastes and has lower cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is an infrared spectrum of a filtrate reducer of biomass synthetic resin prepared in example 1 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The raw materials used in the following examples of the invention are all commercial products, and the furfuryl alcohol is purchased from Shandong Luke chemical group company Limited and has the purity of 98 percent; furfural was purchased from shen county water source new energy science and technology ltd; sodium metabisulfite is purchased from Suzhou Huafeng chemical technology, Inc., and has the purity of 97 percent; the anhydrous sodium sulfite is purchased from Jiahong chemical technology Co., Ltd, Suzhou, and has a purity of 96%.

Example 1

Adding 80 parts of furfuryl alcohol, 1 part of water and 100 parts of furfural in sequence into a four-port reaction kettle with a reflux device by weight, and stirring for 10min at a stirring speed of 250rpm to obtain a mixture 1; keeping the stirring speed at 250rpm constant, adding 25 parts of sodium metabisulfite into the mixture 1 by 5 times, wherein the adding amount is 5 parts each time, and stirring for 10min to obtain a mixture 2; adding 40 parts of anhydrous sodium sulfite into the mixture 2 for 4 times, wherein the adding amount is 10 parts each time, and stirring for 10min to obtain a mixture 3; heating the temperature to 60 ℃, reacting for 30min, then adjusting the temperature of the reaction kettle, heating to 95 ℃, and reacting for 20min to obtain a mixture 4; and adding 3 parts of water into the mixture 4 every 20min, adding 4 times of water, continuing to react for 60min, and discharging to obtain the biomass synthetic resin filtrate reducer.

The biomass synthetic resin filtrate reducer prepared in the embodiment 1 of the invention is subjected to infrared spectrum characterization, and the detection result is shown in figure 1, wherein 1219cm in figure 1^-1、1150cm^-1、1015cm^-1The position is a C-H deformation vibration absorption peak of the furan ring; 918cm^-1、884cm^-1、794cm^-1The position is a furan ring surface external deformation vibration absorption peak; 1505cm^-1The position is a furan ring C ═ C double bond stretching vibration peak; 747cm^-1The part is a C-H out-of-plane bending vibration belt; 884cm^-1Is a furan ring alpha-H absorption peak; 1740 and 1730cm^-1The peak is C-O stretching vibration peak. The biomass synthetic resin filtrate reducer prepared in the embodiment 1 of the invention has a structure shown in a formula I, and is consistent with an expected product.

Example 2

Sequentially adding 90 parts of furfuryl alcohol, 1 part of water and 150 parts of furfural into a four-port reaction kettle with a reflux device in parts by weight, and stirring for 10min at a stirring speed of 300rpm to obtain a mixture 1; keeping the stirring speed at 300rpm constant, adding 40 parts of sodium metabisulfite into the mixture 1 for 4 times, wherein the adding amount is 10 parts each time, and stirring for 10min to obtain a mixture 2; adding 60 parts of anhydrous sodium sulfite into the mixture 2 by 5 times, wherein the adding amount is 12 parts each time, and stirring for 10min to obtain a mixture 3; heating the temperature to 70 ℃, reacting for 30min, then adjusting the temperature of the reaction kettle, heating to 105 ℃, and reacting for 30min to obtain a mixture 4; and adding 3 parts of water into the mixture 4 every 20min, adding 4 times of water, continuing to react for 90min, and discharging to obtain the biomass synthetic resin filtrate reducer.

Example 3

Adding 95 parts of furfuryl alcohol, 1 part of water and 180 parts of furfural in sequence in parts by weight into a four-port reaction kettle with a reflux device, and stirring for 20min at a stirring speed of 250rpm to obtain a mixture 1; keeping the stirring speed at 250rpm constant, adding 60 parts of sodium metabisulfite into the mixture 1 by 5 times, wherein the adding amount is 12 parts each time, and stirring for 20min to obtain a mixture 2; adding 40 parts of anhydrous sodium sulfite into the mixture 2 for 4 times, wherein the adding amount is 10 parts each time, and stirring for 20min to obtain a mixture 3; heating the temperature to 65 ℃, reacting for 30min, then adjusting the temperature of the reaction kettle, heating to 100 ℃, and reacting for 30min to obtain a mixture 4; and adding 3 parts of water into the mixture 4 every 20min, adding 4 times of water, continuing to react for 90min, and discharging to obtain the biomass synthetic resin filtrate reducer.

Example 4

Adding 80 parts of furfuryl alcohol, 1 part of water and 200 parts of furfural in sequence into a four-port reaction kettle with a reflux device in parts by weight, and stirring for 15min at a stirring speed of 300rpm to obtain a mixture 1; keeping the stirring speed at 300rpm constant, adding 60 parts of sodium metabisulfite into the mixture 1 by 5 times, wherein the adding amount is 12 parts each time, and stirring for 15min to obtain a mixture 2; adding 20 parts of anhydrous sodium sulfite into the mixture 2 for 5 times, wherein the adding amount is 4 parts each time, and stirring for 15min to obtain a mixture 3; heating the temperature to 68 ℃, reacting for 30min, then adjusting the temperature of the reaction kettle, heating to 102 ℃, and reacting for 30min to obtain a mixture 4; and adding 3 parts of water into the mixture 4 every 30min, adding 4 times of water, continuing to react for 80min, and discharging to obtain the biomass synthetic resin filtrate reducer.

Example 5

Adding 85 parts of furfuryl alcohol, 1 part of water and 120 parts of furfural into a four-port reaction kettle with a reflux device in sequence by weight, and stirring for 10min at a stirring speed of 250rpm to obtain a mixture 1; keeping the stirring speed at 250rpm constant, adding 30 parts of sodium metabisulfite into the mixture 1 by 5 times, wherein the adding amount is 6 parts each time, and stirring for 10min to obtain a mixture 2; adding 60 parts of anhydrous sodium sulfite into the mixture 2 by 5 times, wherein the adding amount is 12 parts each time, and stirring for 10min to obtain a mixture 3; heating the temperature to 70 ℃, reacting for 40min, then adjusting the temperature of the reaction kettle, heating to 104 ℃, and reacting for 30min to obtain a mixture 4; and adding 3 parts of water into the mixture 4 every 30min, adding 4 times of water, continuing to react for 80min, and discharging to obtain the biomass synthetic resin filtrate reducer.

Example 6

Adding 100 parts of furfuryl alcohol, 1 part of water and 200 parts of furfural into a four-port reaction kettle with a reflux device in sequence by weight, and stirring for 20min at a stirring speed of 300rpm to obtain a mixture 1; keeping the stirring speed at 300rpm constant, adding 60 parts of sodium metabisulfite into the mixture 1 by 5 times, wherein the adding amount is 12 parts each time, and stirring for 20min to obtain a mixture 2; adding 60 parts of anhydrous sodium sulfite into the mixture 2 by 5 times, wherein the adding amount is 12 parts each time, and stirring for 20min to obtain a mixture 3; heating the temperature to 70 ℃, reacting for 40min, then adjusting the temperature of the reaction kettle, heating to 105 ℃, and reacting for 40min to obtain a mixture 4; and adding 4 parts of water into the mixture 4 every 30min, adding 6 times of water in total, continuing to react for 90min, and discharging to obtain the biomass synthetic resin filtrate reducer.

Example 7

Adding 80 parts of furfuryl alcohol, 1 part of water and 100 parts of furfural in sequence into a four-port reaction kettle with a reflux device by weight, and stirring for 10min at a stirring speed of 250rpm to obtain a mixture 1; keeping the stirring speed at 250rpm constant, adding 20 parts of sodium metabisulfite into the mixture 1 for 4 times, wherein the adding amount is 5 parts each time, and stirring for 10min to obtain a mixture 2; adding 20 parts of anhydrous sodium sulfite into the mixture 2 for 4 times, wherein the adding amount is 5 parts each time, and stirring for 10min to obtain a mixture 3; heating the temperature to 60 ℃, reacting for 30min, then adjusting the temperature of the reaction kettle, heating to 95 ℃, and reacting for 30min to obtain a mixture 4; and adding 3 parts of water into the mixture 4 every 20min, adding 4 times of water, continuing to react for 60min, and discharging to obtain the biomass synthetic resin filtrate reducer.

Example 8

Adding 95 parts of furfuryl alcohol, 1 part of water and 180 parts of furfural in sequence in parts by weight into a four-port reaction kettle with a reflux device, and stirring for 20min at a stirring speed of 250rpm to obtain a mixture 1; keeping the stirring speed at 250rpm constant, adding 60 parts of sodium metabisulfite into the mixture 1 by 5 times, wherein the adding amount is 12 parts each time, and stirring for 20min to obtain a mixture 2; adding 20 parts of anhydrous sodium sulfite into the mixture 2 for 4 times, wherein the adding amount is 5 parts each time, and stirring for 20min to obtain a mixture 3; heating the temperature to 70 ℃, reacting for 30min, then adjusting the temperature of the reaction kettle, heating to 100 ℃, and reacting for 30min to obtain a mixture 4; and adding 3 parts of water into the mixture 4 every 20min, adding 4 times of water, continuing to react for 90min, and discharging to obtain the biomass synthetic resin filtrate reducer.

Comparative example 1

Adding 180 parts of furfural, 95 parts of furfuryl alcohol and 1 part of water in sequence into a four-port reaction kettle with a reflux device by weight, and stirring for 20min at a stirring speed of 250rpm to obtain a mixture 1; keeping the stirring speed at 250rpm constant, adding 60 parts of sodium metabisulfite into the mixture 1 by 5 times, wherein the adding amount is 12 parts each time, and stirring for 20min to obtain a mixture 2; adding 20 parts of anhydrous sodium sulfite into the mixture 2 for 4 times, wherein the adding amount is 5 parts each time, and stirring for 20min to obtain a mixture 3; heating the temperature to 70 ℃, reacting for 30min, then adjusting the temperature of the reaction kettle, heating to 100 ℃, and reacting for 30min to obtain a mixture 4; and adding 3 parts of water into the mixture 4 every 20min, adding 4 times of water, continuing to react for 90min, and discharging to obtain the biomass synthetic resin filtrate reducer.

Comparative example 2

Sequentially adding 150 parts by weight of furfural, 90 parts by weight of furfuryl alcohol and 1 part by weight of water into a four-port reaction kettle with a reflux device, and stirring for 10min at a stirring speed of 300rpm to obtain a mixture 1; keeping the stirring speed at 300rpm constant, adding 40 parts of anhydrous sodium sulfite into the mixture 1 for 4 times, wherein the adding amount is 10 parts each time, and stirring for 10min to obtain a mixture 2; adding 60 parts of sodium metabisulfite into the mixture 2 for 5 times, wherein the adding amount is 12 parts each time, and stirring for 10min to obtain a mixture 3; heating the temperature to 70 ℃, reacting for 30min, then adjusting the temperature of the reaction kettle, heating to 105 ℃, and reacting for 30min to obtain a mixture 4; and adding 3 parts of water into the mixture every 20min, adding 4 times of water, continuously reacting for 90min, and discharging to obtain the biomass synthetic resin filtrate reducer.

Example 9

According to the method for measuring the characteristic viscosity number of the polyacrylamide in GB 12005.1-1989, the molecular weight of the filtrate reducer for the biomass synthetic resin prepared by the embodiment of the invention is measured by using a Ubbelohde viscometer; the dry basis mass fraction, cloud point salinity and dynamic viscosity of the biomass synthetic resin filtrate reducer prepared by the embodiment of the invention are measured according to an industry standard SY/T5094-2017 filtration loss reducer sulfomethyl phenolic resin SMP for drilling fluid; the biodegradability of the biomass synthetic resin filtrate reducer prepared by the embodiment of the invention is measured according to SY/T6787-2010 technical requirement for environmental protection of water-soluble oilfield chemicals. According to the following steps:

yield-product mass × dry basis mass fraction/(feedstock mass-water mass).

The yield of the filtrate reducer of the biomass synthetic resin prepared by the embodiment of the invention is calculated.

1.05g of anhydrous sodium carbonate, 14.0g of bentonite for drilling fluid experiments and 14.0g of evaluation soil for drilling fluid are added into a high-speed stirring cup filled with 350mL of distilled water, the mixture is stirred at high speed for 20min cumulatively, and the mixture is maintained in a sealed manner at 25 ℃ for 24 h.

The drilling fluid is prepared according to the following method:

adding 17.5g (calculated on a dry basis) of sulfonated lignite into a high-speed stirring cup containing the prepared base slurry, stirring at a high speed for 15min, adding 17.5g of the biomass synthetic resin filtrate reducer prepared in the embodiment of the invention, stirring at a high speed for 15min, adding 52.5g of sodium chloride (chemical purity), stirring at a high speed for 15min, finally adding 8.75g of anhydrous sodium carbonate, and stirring at a high speed for 15 min.

The performance test results of the biomass synthetic resin filtrate reducer prepared in the embodiment of the invention are shown in table 1.

Table 1 performance test of filtrate reducer of biomass synthetic resin prepared in the example of the present invention

As can be seen from table 1, the biomass synthetic resin fluid loss additive prepared in embodiments 1 to 8 of the present invention has a yield of 87% or more, a molecular weight of 3000 to 3800, a dry basis of 42% or more, and a cloud point salinity of 180g/L at the highest, and has the characteristics of good salt resistance and fluid loss reduction, and furfuryl alcohol and furfural are both prepared by cracking pentosan contained in agricultural and sideline products such as straw and lignin, and have good biodegradability, and the biodegradability index of the synthetic product is 13% or more, and belongs to a "green" functional product, and meets the performance requirements of the fluid loss additive used as a water-based drilling fluid.

The biomass synthetic resin filtrate reducer prepared in the embodiment of the invention is respectively subjected to performance tests in a saturated salt water drilling fluid system and a polysulfonate drilling fluid system, and base slurry preparation is carried out according to the following method:

and adding 24g of sodium bentonite for drilling fluid experiments and 24g of evaluation soil for drilling fluid into 400mL of distilled water, stirring for 20 minutes on a high-speed stirrer, and then sealing and maintaining for 24 hours.

The performance of the saturated salt water drilling fluid is tested according to the following method:

and adding 20.0g of the biomass synthetic resin filtrate reducer prepared in the embodiment into the prepared base slurry, stirring for 5min at a high speed, adding 120g of sodium chloride and 11.5mL of a sodium hydroxide solution with the mass concentration of 40%, stirring for 20min at a high speed, and rolling and aging for 16h at 180 ℃.

The performance of the polysulfonate drilling fluid is tested according to the following method:

4.0g of sodium carboxymethyl cellulose is added into the prepared base slurry, 20.0g of the biomass synthetic resin filtrate reducer prepared in the example, 20.0g of sulfonated lignite and 15.0g of sulfonated asphalt are added, stirring is carried out for 15min, 11.5mL of sodium hydroxide solution with the mass concentration of 40% is added, stirring is carried out for 20min, and rolling aging is carried out for 16h at 180 ℃.

The results are shown in Table 2.

Table 2 performance test of filtrate reducer of biomass synthetic resin prepared in the embodiment of the present invention in drilling fluid

As can be seen from Table 2, the biomass filtrate reducer provided by the invention has no thickening phenomenon in the process of preparing the drilling fluid in a saturated saline drilling fluid system and a polysulfonate drilling fluid system, the apparent viscosity measured in an aged base slurry is less than or equal to 25mPa.s, the biomass filtrate reducer has good compatibility and practicability with the drilling fluid system, and the filtrate reducer can be controlled within 23mL in the saturated saline drilling fluid and the polysulfonate drilling fluid system under the condition of aging for 16h at 180 ℃ so as to meet the performance requirements. As in comparative examples 1 and 2 in which the order of addition was changed in the present invention, a phenomenon of poor fluid loss performance at high temperature occurred. Therefore, the product synthesized by the preparation method of the biomass filtrate reducer provided by the invention can be completely used as a substitute of SMP.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A biomass synthetic resin fluid loss additive has a structure of formula I:

in the formula I, n is an integer of 15-22.

2. A preparation method of a biomass synthetic resin filtrate reducer comprises the following steps:

3) mixing the second mixture with sodium sulfite to obtain a third mixture;

4) heating the third mixture to obtain a fourth mixture;

3. The method according to claim 2, wherein the mass ratio of furfuryl alcohol, water, furfural in step 1), sodium metabisulfite in step 2), sodium sulfite in step 3) and water in step 5) is (80-100): (1-2): (100-200): (20-60): (20-60): (16-26).

4. The method according to claim 2, wherein the mixing in step 1) is carried out under stirring at a speed of 250 to 300 rpm; the mixing time is 10-20 min.

5. The method according to claim 2, wherein the mixing method in step 2) is:

sodium metabisulfite is added to the first mixture in portions and mixed to obtain a second mixture.

6. The method according to claim 2, wherein the mixing method in step 3) is:

7. The method according to claim 2, wherein the temperature raising process is:

firstly heating the third mixture for the first time and then heating for the second time to obtain a fourth mixture;

the temperature of the primary heating is 60-70 ℃;

the temperature of the secondary heating is 95-105 ℃.

8. The method according to claim 7, wherein the holding time of the primary temperature rise is 30-40 min;

and the heat preservation time of the secondary heating is 20-60 min.

9. The method of claim 2, wherein the mixing in step 5) is performed by:

10. A water-based drilling fluid loss additive comprising the biomass synthetic resin fluid loss additive of claim 1 or the biomass synthetic resin fluid loss additive prepared by the method of claim 2.