CN114907524A - Modified biogel fracturing fluid and preparation method thereof - Google Patents
Modified biogel fracturing fluid and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a fracturing fluid for crude oil development of a shale oil reservoir, in particular to a modified biogel fracturing fluid and a preparation method thereof. The method comprises the steps of carrying out esterification and polymerization on Caesalpinia spinosa Kuntze gum, methacrylic acid and 4-vinylbenzene sulfonic acid under an alkaline condition to obtain polymer colloid, and drying and crushing the prepared colloid to finally obtain the modified biogel fracturing fluid. The modified biogel fracturing fluid has better temperature resistance and mineralization resistance, and the temperature resistance is more than or equal to 115 ℃; the salt tolerance reaches more than 150000 mg/L; under the use concentration of 0.12 percent, the apparent viscosity reaches more than 30 mPa.s; under the concentration of 500ppm, the resistance reduction rate of the guar gum is improved by more than 50 percent compared with that of the traditional guar gum.
Description
Technical Field
The invention relates to a fracturing fluid for crude oil development of a shale oil reservoir, in particular to a modified biogel fracturing fluid and a preparation method thereof.
Background
With the large-scale development of shale gas in the United states, a 'shale gas revolution' is started all over the world, and shale gas exploration and development plans are started in many countries. At present, the shale gas field of China also raises a hot tide of investment exploration and exploitation. Shale belongs to an ultra-low permeability reservoir, cannot provide an seepage channel required by economic exploitation, and can achieve the purpose of industrial exploitation only by improving the flow conductivity of the reservoir through fracturing operation. At present, a small amount of resistance reducing agent, propping agent and some additives are mainly added into water to form slickwater, and the fracturing process with the slickwater as working fluid is adopted to fracture a reservoir stratum.
The biogel petroleum industry is mainly applied to drilling fluid and tertiary oil recovery, and although the biogel petroleum industry can be used as fracturing fluid, detailed performance and field application reports are not found. The biogel has the characteristics of no toxicity, strong tackifying capability, pseudoplasticity, stable performance and the like, particularly, the structural fluid formed by intermolecular association has good supporting suspension performance, although the filtration loss is large compared with the gel fracturing fluid due to the non-crosslinked state, but for the compact reservoir stratum transformed by the main body fracturing at present, the filtration loss basically has no influence on fracturing fluid fracture, therefore, the biogum can meet the use requirement of the fracturing fluid in terms of performance, but the existing biogums are all non-water-soluble, the modified biogum FAD-120 is still not in accordance with the field requirements when being used for hydraulic fracturing, so researchers begin to carry out modification research on biogums in recent years, a biogum FAD-120 with molecular association capability is obtained by modification through etherification reaction in 2016 of the institute of petroleum exploration and development, and the formed biogum FAD-120 fracturing liquid system is tested in 228 blocks of the Changqing oil field, so that the application effect is good. The successful application of the fracturing fluid has high requirements on changing the water quality of the guar gum fracturing fluid and expanding the fluid preparation water source of the fracturing fluid; the guar gum inlet of the main fracturing fluid is changed, and the cost of the fracturing fluid is reduced; and has profound significance for guaranteeing the smooth implementation of large-scale volume transformation and factory operation.
On the basis of the research of the predecessors, the researchers modify the Caesalpinia spinosa gum to obtain a fracturing fluid system with excellent performance and various functions, and the fracturing fluid system has more excellent viscoelasticity, sand carrying property and the like compared with the conventional commercially available biological gum fracturing fluid.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a modified biogel fracturing fluid and a preparation method thereof. The method comprises the steps of carrying out esterification and polymerization on Caesalpinia spinosa Kuntze gum, methacrylic acid and 4-vinylbenzene sulfonic acid under an alkaline condition to obtain polymer colloid, and drying and crushing the prepared colloid to finally obtain the modified biogel fracturing fluid. The modified biogel fracturing fluid has better temperature resistance and mineralization resistance, and the temperature resistance is more than or equal to 115 ℃; the salt tolerance reaches more than 150000 mg/L; the apparent viscosity of the aqueous dispersion was 30 mPas or more at a use concentration of 0.12%.
In order to achieve the above object, one of the objects of the present invention is to provide a method for preparing a modified biogel fracturing fluid, comprising the steps of:
(1) pouring the Caesalpinia spinosa Kuntze gum into a four-neck flask with a mechanical stirrer, adding a sodium hydroxide solution into the Caesalpinia spinosa Kuntze gum, forming a dispersion liquid under the condition that the stirring speed is 300-500 rpm, then introducing nitrogen, heating to 40-70 ℃ after 10-20 min, and stirring at constant temperature for 2-5 h to obtain a mixed solution;
(2) adding methacrylic acid and 4-vinylbenzenesulfonic acid into the mixed solution, reducing the reaction temperature to 20-40 ℃, then slowly adding an initiator aqueous solution by using a constant-pressure dropping funnel, wherein the dropping rate is 7-10 drops/min, and after the dropping is finished, dropping the mixed solution of a cross-linking agent and sodium hydroxide by using the constant-pressure dropping funnel, wherein the dropping rate is 5-25 drops/min; after all the dropwise adding is finished, stopping stirring, heating the reaction temperature to 60-75 ℃, and continuously reacting for 3-5 hours at constant temperature to obtain polymer colloid;
(3) and taking the polymer colloid out of the four-neck flask, putting the polymer colloid into a 55-75 ℃ forced air drying oven for drying for 1-3 hours until the polymer colloid is in a semi-dry state, shearing the polymer colloid into pieces, drying the polymer colloid until the weight is constant, taking out the semi-finished product, putting the semi-finished product into a crusher for crushing, and sieving the crushed semi-finished product with a 30-50-mesh sieve to obtain the required modified biological glue fracturing fluid.
Preferably, the mass ratio of the Caesalpinia spinosa gum to the methacrylic acid to the 4-vinylbenzene sulfonic acid is 1: 2.5-30: 0.5-15;
more preferably, the mass ratio of the Caesalpinia spinosa gum to the methacrylic acid to the 4-vinylbenzene sulfonic acid is 1: 8-12: 4-7;
more preferably, the mass ratio of the Caesalpinia spinosa gum to the methacrylic acid to the 4-vinylbenzene sulfonic acid is 1:10: 5.
Preferably, in the step (1), the mass of the sodium hydroxide solution is 15-100 times of the mass of the Caesalpinia spinosa Gum, and more preferably 20-50 times of the mass of the Caesalpinia spinosa Gum; the mass concentration of the sodium hydroxide solution is 0.05-2.0%, and more preferably 0.1-0.5%.
Preferably, in the step (1), the nitrogen is introduced at a rate of 5 to 20 ml/min.
Preferably, in the step (2), the initiator is one or a mixture of two of ammonium persulfate, potassium persulfate and sodium persulfate; the mass of the initiator solution is 0.05-0.5% of that of the Caesalpinia spinosa Gum; the mass concentration of the initiator solution is 5-10%.
Preferably, in step (2), the crosslinking agent is one or two mixtures of N, N-methylene bisacrylamide, divinylbenzene and diisocyanate.
Preferably, in the step (2), the mass of the mixed solution of the cross-linking agent and the sodium hydroxide is 5-10 times of that of the Caesalpinia spinosa Gum; the mass ratio of the cross-linking agent to the sodium hydroxide in the mixed solution of the cross-linking agent and the sodium hydroxide is 1: 1-10: 50-1000, and more preferably 1:3-5: 120-320.
The invention also aims to provide the modified biogel fracturing fluid prepared by the preparation method.
The modified biogum fracturing fluid provided by the invention is easy to dissolve in a water phase, has strong water absorption, does not need to be crosslinked in the field application process, and simplifies the field construction process; two polymer monomers of methacrylic acid and 4-vinyl benzene sulfonic acid are added into the biogel type fracturing fluid, and the biogel type fracturing fluid has the following effects: (1) the benzene sulfonate group is added, so that the temperature resistance and salt resistance of the system can be effectively enhanced; (2) the stability of the two monomers is far higher than that of the conventional crosslinking agent through double bond polymerization, so that the crosslinking form is as follows: the double bonds are a skeleton, and the cross-linking agent forms a compact network structure, so that the stable control of moisture is realized; (3) the two introduced monomer molecules have strong hydrophilic side chains, and the side chains adsorb the hydration film through O, N elements, so that the formed hydration colloids have smaller friction resistance with each other.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the modified biogel fracturing fluid can be used for obtaining a product through one-pot reaction in the production process, and the production process time is short, so that the production process is greatly simplified, and the production cost is reduced;
(2) the modified biogel fracturing fluid has good temperature resistance and mineralization resistance, and the temperature resistance is more than or equal to 115 ℃; the salt tolerance reaches more than 150000 mg/L;
(3) the modified biological glue fracturing fluid has excellent sand carrying and stability under low concentration, and the apparent viscosity reaches more than 30mPa.s under the use concentration of 0.12 percent; under the concentration of 500ppm, the resistance reduction rate of the guar gum is improved by more than 50 percent compared with that of the traditional guar gum;
(4) the modified biogum fracturing fluid is degradable biological polysaccharide, can be completely biodegraded within 5 hours at the temperature of more than 50 ℃, and the viscosity of a gel breaking solution is less than 3 mPa.s.
Detailed Description
The present invention is described in further detail below with reference to specific examples and with reference to the data. It will be understood that these examples are intended to illustrate the invention and are not intended to limit the scope of the invention in any way.
Example 1:
(1) pouring 10g of Caesalpinia spinosa Gum into a four-neck flask with a mechanical stirrer, adding 150g of 0.05% sodium hydroxide solution into the flask, forming dispersion liquid under the condition that the stirring speed is 300rpm, then introducing nitrogen at the speed of 5ml/min, heating to 40 ℃ after 10min, and stirring at constant temperature for 2h to obtain a mixed solution;
(2) adding 25g of methacrylic acid and 5g of 4-vinylbenzenesulfonic acid into the mixed solution, reducing the reaction temperature to 20 ℃, then slowly adding 0.005g of initiator aqueous solution with the mass concentration of 5% by using a constant-pressure dropping funnel, wherein the initiator is ammonium persulfate, the dropping speed is 7 drops/min, after the dropping is finished, dropwise adding 50g of mixed solution of a cross-linking agent and sodium hydroxide by using the constant-pressure dropping funnel, wherein the cross-linking agent is N, N-methylene bisacrylamide, the mass ratio of the cross-linking agent to the sodium hydroxide to the water is 1:1:50, and the dropping speed is 5 drops/min; after all the dropwise adding is finished, stopping stirring, heating the reaction temperature to 60 ℃, and continuously reacting for 3 hours at constant temperature to obtain polymer colloid;
(3) taking out the polymer colloid from the four-neck flask, drying in a 55 ℃ forced air drying oven for 1h to a semi-dry state, shearing, drying to constant weight, taking out the semi-finished product, pulverizing in a pulverizer, and sieving with a 30-mesh sieve to obtain the required modified biogel fracturing fluid D 1 。
The modified biological glue fracturing fluid D is tested by salt tolerance and salt tolerance 1 The temperature resistance reaches 121 ℃; the salt tolerance reaches 170000 mg/L.
Example 2:
(1) pouring 10g of Caesalpinia spinosa gel into a four-neck flask with a mechanical stirrer, adding 200g of 0.1% sodium hydroxide solution at the mass concentration, forming a dispersion liquid under the condition that the stirring speed is 320rpm, then introducing nitrogen at the speed of 8ml/min, heating to 45 ℃ after 10min, and stirring at constant temperature for 2h to obtain a mixed solution;
(2) adding 50g of methacrylic acid and 10g of 4-vinylbenzenesulfonic acid into the mixed solution, reducing the reaction temperature to 25 ℃, then slowly adding 0.008g of initiator aqueous solution with the mass concentration of 6% by using a constant-pressure dropping funnel, wherein the initiator is potassium persulfate, the dropping rate is 7 drops/min, after the dropping is finished, dropping 60g of mixed solution of a cross-linking agent and sodium hydroxide by using the constant-pressure dropping funnel, wherein the cross-linking agent is N, N-methylene bisacrylamide, the mass ratio of the cross-linking agent to the sodium hydroxide to the water is 1:2:100, and the dropping rate is 8 drops/min; after all the dropwise adding is finished, stopping stirring, heating the reaction temperature to 65 ℃, and continuing reacting for 3.5 hours at constant temperature to obtain polymer colloid;
(3) taking out the polymer colloid from the four-neck flask, putting the polymer colloid into a forced air drying oven at 58 ℃ for drying for 1h to be in a semi-dry state, shearing, drying to be in a constant weight, taking out a semi-finished product, putting the semi-finished product into a crusher for crushing, and sieving by a 30-mesh sieve to obtain the required modified biogel fracturing fluid D 2 。
Through the test of salt tolerance and salt tolerance, the salt-resistant performance is improvedSex biogel fracturing fluid D 2 The temperature resistance reaches 125 ℃; the salt tolerance reaches 160000 mg/L.
Example 3:
(1) pouring 10g of Caesalpinia spinosa Kuntze gum into a four-neck flask with a mechanical stirrer, adding 300g of 0.2% sodium hydroxide solution into the flask, forming dispersion liquid under the condition that the stirring speed is 350rpm, then introducing nitrogen at the speed of 10ml/min, after 15min, heating to 55 ℃, and stirring at constant temperature for 3h to obtain a mixed solution;
(2) adding 120g of methacrylic acid and 20g of 4-vinylbenzenesulfonic acid into the mixed solution, reducing the reaction temperature to 30 ℃, then slowly adding 0.01g of initiator aqueous solution with the mass concentration of 7% by using a constant-pressure dropping funnel, wherein the initiator is ammonium persulfate, the dropping speed is 8 drops/min, after the dropping is finished, dropping 70g of mixed solution of a crosslinking agent and sodium hydroxide by using the constant-pressure dropping funnel, wherein the crosslinking agent is divinylbenzene, the mass ratio of the crosslinking agent to the sodium hydroxide to the water is 1:3:200, and the dropping speed is 10 drops/min; after all the dropwise adding is finished, stopping stirring, heating the reaction temperature to 62 ℃, and continuing to perform constant-temperature reaction for 4.5 hours to obtain a polymer colloid;
(3) taking out the polymer colloid from the four-neck flask, putting the polymer colloid into a 60 ℃ forced air drying oven for drying for 2h to a semi-dry state, shearing, drying to constant weight, taking out the semi-finished product, putting the semi-finished product into a crusher for crushing, and sieving by a 40-mesh sieve to obtain the required modified biogel fracturing fluid D 3 。
The modified biological glue fracturing fluid D is tested by salt tolerance and salt tolerance 3 The temperature resistance reaches 120 ℃; the salt tolerance reaches 165000 mg/L.
Example 4:
(1) pouring 10g of Caesalpinia spinosa Gum into a four-neck flask with a mechanical stirrer, adding 400g of 0.5% sodium hydroxide solution into the flask, forming dispersion liquid under the condition of stirring speed of 400rpm, introducing nitrogen at the speed of 12ml/min, heating to 50 ℃ after 18min, and stirring at constant temperature for 3h to obtain a mixed solution;
(2) adding 150g of methacrylic acid and 40g of 4-vinylbenzenesulfonic acid into the mixed solution, reducing the reaction temperature to 32 ℃, then slowly adding 0.02g of an initiator aqueous solution with the mass concentration of 8% by using a constant-pressure dropping funnel, wherein the initiator is potassium persulfate, the dropping rate is 8 drops/min, after the dropping is finished, dropping 80g of a mixed solution of a cross-linking agent and sodium hydroxide by using the constant-pressure dropping funnel, wherein the cross-linking agent is diisocyanate, the mass ratio of the cross-linking agent to the sodium hydroxide to the water is 1:5:300, and the dropping rate is 15 drops/min; after all the dropwise adding is finished, stopping stirring, heating the reaction temperature to 63 ℃, and continuing reacting for 4 hours at constant temperature to obtain polymer colloid;
(3) taking out the polymer colloid from the four-neck flask, putting the polymer colloid into a 65 ℃ forced air drying oven for drying for 2h to a semi-dry state, shearing the polymer colloid into pieces, drying the polymer colloid to a constant weight, taking out the semi-finished product, putting the semi-finished product into a crusher for crushing, and sieving the crushed semi-finished product with a 30-mesh sieve to obtain the required modified biological glue fracturing fluid D 4 。
The modified biological glue fracturing fluid D is tested by salt tolerance and salt tolerance 4 The temperature resistance reaches 122 ℃; salt tolerance reaches 168000 mg/L.
Example 5:
(1) pouring 10g of Caesalpinia spinosa Kuntze gum into a four-neck flask with a mechanical stirrer, adding 500g of 1.0% sodium hydroxide solution into the flask, forming dispersion liquid under the condition that the stirring speed is 380rpm, then introducing nitrogen at the speed of 16ml/min, after 12min, heating to 55 ℃, and stirring at constant temperature for 3h to obtain a mixed solution;
(2) adding 100g of methacrylic acid and 50g of 4-vinylbenzenesulfonic acid into the mixed solution, reducing the reaction temperature to 35 ℃, then slowly adding 0.025g of initiator aqueous solution with the mass concentration of 9% by using a constant-pressure dropping funnel, wherein the initiator is sodium persulfate, the dropping rate is 8 drops/min, after the dropping is finished, dropwise adding 85g of mixed solution of a crosslinking agent and sodium hydroxide by using the constant-pressure dropping funnel, the crosslinking agent is divinylbenzene, the mass ratio of the crosslinking agent to the sodium hydroxide to the water is 1:6:500, and the dropping rate is 18 drops/min; after all the dropwise adding is finished, stopping stirring, heating the reaction temperature to 70 ℃, and continuing to perform constant-temperature reaction for 5 hours to obtain a polymer colloid;
(3) taking out the polymer colloid from the four-neck flask, drying in a forced air drying oven at 70 deg.C for 1 hr to semi-dry state, and dryingShearing, drying to constant weight, taking out the semi-finished product, pulverizing in a pulverizer, and sieving with 50 mesh sieve to obtain the desired modified biological gel fracturing fluid D 5 。
The modified biological glue fracturing fluid D is tested by salt tolerance and salt tolerance 5 The temperature resistance reaches 136 ℃; the salt tolerance reaches 185000 mg/L.
Example 6:
(1) pouring 10g of Caesalpinia spinosa gel into a four-neck flask with a mechanical stirrer, adding 600g of 1.2% sodium hydroxide solution into the flask, forming dispersion liquid under the condition that the stirring speed is 420rpm, then introducing nitrogen at the speed of 15ml/min, after 15min, heating to 60 ℃, and stirring at constant temperature for 4h to obtain a mixed solution;
(2) adding 200g of methacrylic acid and 70g of 4-vinylbenzenesulfonic acid into the mixed solution, reducing the reaction temperature to 38 ℃, then slowly adding 0.03g of an initiator aqueous solution with the mass concentration of 8% by using a constant-pressure dropping funnel, wherein the initiator is sodium persulfate, the dropping rate is 9 drops/min, after the dropping is finished, dropping 90g of a mixed solution of a cross-linking agent and sodium hydroxide by using the constant-pressure dropping funnel, the cross-linking agent is N, N-methylene bisacrylamide, the mass ratio of the cross-linking agent to the sodium hydroxide to the water is 1:8:600, and the dropping rate is 20 drops/min; after all the dropwise adding is finished, stopping stirring, heating the reaction temperature to 72 ℃, and continuing to perform constant-temperature reaction for 4.5 hours to obtain a polymer colloid;
(3) taking out the polymer colloid from the four-neck flask, putting the polymer colloid into a 68 ℃ forced air drying oven for drying for 2h to a semi-dry state, shearing, drying to constant weight, taking out the semi-finished product, putting the semi-finished product into a crusher for crushing, and sieving by a 30-mesh sieve to obtain the required modified biogel fracturing fluid D 6 。
The modified biological glue fracturing fluid D is tested by salt tolerance and salt tolerance 6 The temperature resistance reaches 130 ℃; the salt tolerance reaches 178000 mg/L.
Example 7:
(1) pouring 10g of Caesalpinia spinosa Kuntze gum into a four-neck flask with a mechanical stirrer, adding 800g of 1.5% sodium hydroxide solution into the flask, forming dispersion liquid under the condition that the stirring speed is 450rpm, then introducing nitrogen at the speed of 18ml/min, heating to 65 ℃ after 16min, and stirring at constant temperature for 4h to obtain a mixed solution;
(2) adding 250g of methacrylic acid and 100g of 4-vinylbenzenesulfonic acid into the mixed solution, reducing the reaction temperature to 22 ℃, then slowly adding 0.04g of initiator aqueous solution with the mass concentration of 7% by using a constant-pressure dropping funnel, wherein the initiator is ammonium persulfate, the dropping speed is 8 drops/min, after the dropping is finished, dropping 95g of mixed solution of a crosslinking agent and sodium hydroxide by using the constant-pressure dropping funnel, wherein the crosslinking agent is divinylbenzene, the mass ratio of the crosslinking agent to the sodium hydroxide to the water is 1:9:800, and the dropping speed is 15 drops/min; after all the dropwise adding is finished, stopping stirring, heating the reaction temperature to 68 ℃, and continuing to perform constant-temperature reaction for 5 hours to obtain a polymer colloid;
(3) taking out the polymer colloid from the four-neck flask, putting the polymer colloid into a 72 ℃ forced air drying oven for drying for 3h to be in a semi-dry state, then shearing the polymer colloid into pieces, drying the polymer colloid to be in a constant weight, finally taking out the semi-finished product, putting the semi-finished product into a crusher for crushing, and screening the crushed semi-finished product by a 40-mesh sieve to obtain the required modified biogel fracturing fluid D 7 。
The modified biological glue fracturing fluid D is tested by salt tolerance and salt tolerance 7 The temperature resistance reaches 128 ℃; the salt tolerance reaches 170000 mg/L.
Example 8:
(1) pouring 10g of Caesalpinia spinosa gel into a four-neck flask with a mechanical stirrer, adding 1000g of a sodium hydroxide solution with the mass concentration of 2.0%, forming a dispersion liquid under the condition that the stirring speed is 500rpm, then introducing nitrogen at the speed of 20ml/min, after 20min, heating to 70 ℃, and stirring at constant temperature for 5h to obtain a mixed solution;
(2) adding 300g of methacrylic acid and 150g of 4-vinylbenzenesulfonic acid into the mixed solution, reducing the reaction temperature to 40 ℃, then slowly adding 0.05g of initiator aqueous solution with the mass concentration of 10% by using a constant-pressure dropping funnel, wherein the initiator is sodium persulfate, the dropping rate is 10 drops/min, after the dropping is finished, dropping 100g of mixed solution of a cross-linking agent and sodium hydroxide by using the constant-pressure dropping funnel, wherein the cross-linking agent is diisocyanate, the mass ratio of the cross-linking agent to the sodium hydroxide to the water is 1:10:1000, and the dropping rate is 25 drops/min; after all the dropwise adding is finished, stopping stirring, heating the reaction temperature to 75 ℃, and continuing to perform constant-temperature reaction for 5 hours to obtain a polymer colloid;
(3) taking out the polymer colloid from the four-neck flask, putting the polymer colloid into a blast drying oven at 75 ℃ for drying for 3h to be in a semi-dry state, shearing, drying to be in a constant weight, taking out a semi-finished product, putting the semi-finished product into a crusher for crushing, and sieving by a 50-mesh sieve to obtain the required modified biogel fracturing fluid D 8 。
The modified biological glue fracturing fluid D is tested by salt tolerance and salt tolerance 8 The temperature resistance reaches 125 ℃; the salt tolerance reaches 172000 mg/L.
Test example 1 evaluation of thickening test of modified biogel fracturing fluid
The viscosifying test of the modified biogel fracturing fluid is carried out according to the method specified in Q/SH 10202754-. The commercial products are selected from guar gum fracturing fluid JL-LH of Shandongda biochemical engineering limited company and associative clean fracturing fluid thickener APV-1 of Sichuan Worui science and technology limited company. The test results are shown in Table 1.
TABLE 1 viscosifying Property test results for fracturing fluids
As can be seen from the comparison of the viscosifying and viscoelastic properties with commercially available fracturing fluid products, the modified biogum fracturing fluid of the invention has superior viscosifying and viscoelastic properties to commercially available fracturing fluid products, particularly D of the invention 5 The viscosity of the product reaches 56.8mPa.s, and the suspension and the transportation of fracturing propping agents of different models are completely met. According to the test result of the gel breaking performance of the modified biological gel fracturing fluid, the modified biological gel fracturing fluid has the advantages of short gel breaking time and low viscosity after gel breaking and easy flowback, compared with the commercial guar gum fracturing fluid and the commercial biological gel fracturing fluid, the modified biological gel fracturing fluid has the minimum gel breaking time of 4.0h which is far lower than 5.6h of the commercial product, and in addition, the viscosity of the gel breaking fluid is also lower than 50% of the commercial product.
Test example 2 evaluation of resistance-reducing Properties of fracturing fluid
The modified biogum fracturing fluid is tested by adopting an MZY-3 type fracturing fluid abrasion resistance reducing tester of stone instrumentation and technology Limited of China university, the test mass fraction is 0.1%, the test pipe diameter is 0.46cm, the test pipe length is 3.2m, and the test temperature is room temperature. The guar gum fracturing fluid JL-LH of Shandongda biochemical engineering Co., Ltd and the associated clean fracturing fluid thickener APV-1 of Sichuan Worui science and technology Co., Ltd were respectively tested under different concentrations of the drag reducer and the commercially available fracturing fluid of examples 1-8 according to the discharge capacity required by the conventional operation of 30L/min. The resistance reduction rate of (D) is shown in Table 2.
TABLE 2 drag reduction test results for different drag reduction agents at different concentrations
As can be seen from table 2, the modified biogum fracturing fluid of the present invention has excellent resistance reduction performance, the resistance reduction rate reaches more than 90% at a concentration of 500ppm, and the amount of the modified biogum fracturing fluid is lower than that of other resistance reduction agents, such that the use cost is significantly reduced, and the resistance reduction performance of the fracturing fluid is enhanced, and compared with guar fracturing fluid, the resistance reduction rate of the modified biogum fracturing fluid of the present invention at a concentration of 500ppm is increased by more than 50%, and the modified biogum fracturing fluid is suitable for being used as a substitute for a conventional resistance reduction agent.
Claims (10)
1. The preparation method of the modified biogel fracturing fluid is characterized by comprising the following steps:
(1) pouring the Caesalpinia spinosa gum into a four-neck flask with a mechanical stirrer, adding a sodium hydroxide solution into the mixture, forming a dispersion liquid under the condition that the stirring speed is 300-500 rpm, then introducing nitrogen, heating to 40-70 ℃ after 10-20 min, and stirring at constant temperature for 2-5 h to obtain a mixed solution;
(2) adding methacrylic acid and 4-vinylbenzenesulfonic acid into the mixed solution, reducing the reaction temperature to 20-40 ℃, then slowly adding an initiator aqueous solution by using a constant-pressure dropping funnel, wherein the dropping rate is 7-10 drops/min, and after the dropping is finished, dropping the mixed solution of a cross-linking agent and sodium hydroxide by using the constant-pressure dropping funnel, wherein the dropping rate is 5-25 drops/min; after all the dropwise adding is finished, stopping stirring, heating the reaction temperature to 60-75 ℃, and continuously reacting for 3-5 hours at constant temperature to obtain polymer colloid;
(3) and taking the polymer colloid out of the four-neck flask, putting the polymer colloid into a 55-75 ℃ forced air drying oven for drying for 1-3 hours until the polymer colloid is in a semi-dry state, shearing the polymer colloid into pieces, drying the polymer colloid until the weight is constant, taking out the semi-finished product, putting the semi-finished product into a crusher for crushing, and sieving the crushed semi-finished product with a 30-50-mesh sieve to obtain the required modified biological glue fracturing fluid.
2. The preparation method of the modified biogel fracturing fluid according to claim 1, wherein the mass ratio of the Caesalpinia spinosa gum to the methacrylic acid to the 4-vinylbenzene sulfonic acid is 1: 2.5-30: 0.5-15.
3. The preparation method of the modified biogel fracturing fluid according to claim 2, wherein the mass ratio of the Caesalpinia spinosa gum to the methacrylic acid to the 4-vinylbenzene sulfonic acid is 1: 8-12: 4-7.
4. The preparation method of the modified biogel fracturing fluid according to claim 3, wherein the mass ratio of the Caesalpinia spinosa gum to the methacrylic acid to the 4-vinylbenzene sulfonic acid is 1:10: 5.
5. The preparation method of the modified biogel fracturing fluid according to claim 1, wherein in the step (1), the mass of the sodium hydroxide solution is 15-100 times of that of the Caesalpinia spinosa gel; the mass concentration of the sodium hydroxide solution is 0.05-2.0%.
6. The method for preparing the modified biogel fracturing fluid as claimed in claim 1, wherein in the step (1), the nitrogen is introduced at a speed of 5-20 ml/min.
7. The method for preparing the modified biogum fracturing fluid according to claim 1, wherein in the step (2), the initiator is one or a mixture of two of ammonium persulfate, potassium persulfate and sodium persulfate; the mass of the initiator solution is 0.05-0.5% of the mass of the Caesalpinia spinosa Gum; the mass concentration of the initiator solution is 5-10%.
8. The process for preparing modified biogel fracturing fluid according to claim 1, wherein in step (2), the cross-linking agent is one or two mixtures of N, N-methylene bisacrylamide, divinylbenzene and diisocyanate.
9. The preparation method of the modified biogel fracturing fluid according to claim 1, wherein in the step (2), the mass of the mixed solution of the cross-linking agent and the sodium hydroxide is 5-10 times of that of the Caesalpinia spinosa gel; the mass ratio of the cross-linking agent to the sodium hydroxide in the mixed solution of the cross-linking agent and the sodium hydroxide is 1: 1-10: 50-1000.
10. The modified biogel fracturing fluid prepared by the preparation method according to any one of claims 1 to 9.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104531125A (en) * | 2014-12-12 | 2015-04-22 | 中国石油天然气股份有限公司 | Modified fenugreek gum fracturing fluid and preparation method thereof |
| CN111621274A (en) * | 2020-04-30 | 2020-09-04 | 中国石油大学(华东) | Controllable degradable water swelling type fracturing temporary plugging agent, preparation method and application thereof |
| CN111944510A (en) * | 2020-08-27 | 2020-11-17 | 西安奥德石油工程技术有限责任公司 | Thickening agent for clean fracturing fluid and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104531125A (en) * | 2014-12-12 | 2015-04-22 | 中国石油天然气股份有限公司 | Modified fenugreek gum fracturing fluid and preparation method thereof |
| CN111621274A (en) * | 2020-04-30 | 2020-09-04 | 中国石油大学(华东) | Controllable degradable water swelling type fracturing temporary plugging agent, preparation method and application thereof |
| CN111944510A (en) * | 2020-08-27 | 2020-11-17 | 西安奥德石油工程技术有限责任公司 | Thickening agent for clean fracturing fluid and preparation method thereof |
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