CN115948156A - Preparation method and application of resin-coated colored sand fracturing proppant - Google Patents

Abstract

The application discloses various sand fracturing propping agent of resin tectorial membrane, including following step: s1, selecting a propping agent meeting the standard, and pouring the propping agent into a stirrer; s2, weighing color paste with the weight of 0.8-1.0% of that of the propping agent, and pouring the color paste into a stirrer for sand mixing; s3, adding the propping agent coated with the color paste coating into a sand mixer, heating to 180-240 ℃, and stirring; s4, weighing epoxy resin accounting for 0.8-1.2% of the weight of the propping agent and phenolic resin accounting for 1.2-1.8% of the weight of the propping agent, adding the epoxy resin and the phenolic resin into a sand mixer, and stirring until the mixed color is uniform; s5, weighing hexamethylene tetramine accounting for 15% of the weight of the resin, and adding the hexamethylene tetramine into a sand mixer. The application also comprises an application of the resin coated color sand fracturing propping agent. This application is through carrying out different dyeing tectorial membranes to different specification proppant and handling, can confirm the proppant specification through the sand color when taking place the sand to change the proppant, provide data support for the same landform simultaneously, reduce the sand output.

Description

Preparation method and application of resin coated colored sand fracturing proppant

Technical Field

The invention relates to the technical field of proppant production, and in particular to a preparation method and application of a resin-coated colored sand fracturing proppant.

Background Art

In the process of oilfield exploitation, as the oilfield exploitation continues, the formation energy will continue to decline. At this time, the pressure difference inside the oil well will continue to increase, which will lead to the problem of sand production in the oil well becoming more and more serious. The sand production in the oil well will have a relatively large impact on its production capacity. The formation sand will enter the wellbore, which may cause the pipeline and equipment to be blocked, or damage the pump, and may even cause the well wall to collapse, causing the casing to deform and damage, and ultimately making the oil well unable to continue production, and it will affect subsequent exploitation and the final recovery rate. Therefore, strengthening the research on the mechanism of oil well sand production and taking effective sand prevention measures to prevent the problem of oil well sand production is of great significance to ensure the stability of oil field production capacity and improve the final recovery rate.

When sand is produced from the proppant, on-site personnel cannot determine which specification of proppant produces the most sand, and which section of the oil pipeline is not suitable for mining, so they need to change the proppant specifications. To this end, we proposed a preparation method and application of resin-coated colored sand fracturing proppant to solve the above problems.

Summary of the invention

The present application provides a preparation method of a resin-coated colored sand fracturing proppant and its application, which solves the problem that when sand is produced in the existing production process of petroleum, the sand specifications cannot be determined.

The present application provides a resin-coated colored sand fracturing proppant, comprising the following steps:

S1, select the proppant that meets the standards and pour it into the mixer;

S2, weighing 0.8-1.0% of the weight of the proppant color paste, pouring the color paste into the mixer to mix with sand;

S3, adding the color paste coated proppant to the sand mixer, heating to 180-240°C and stirring;

S4, weighing 0.8-1.2% of the proppant weight of epoxy resin and 1.2-1.8% of phenolic resin, adding them into the sand mixer, and stirring until the mixture is uniform;

S5, weighing 15% of the weight of the resin hexamethylenetetramine and adding it into the sand mixer, stirring until the epoxy resin is solidified, and cooling to room temperature;

S6, screening to obtain resin-coated colored sand fracturing proppant of required specifications.

Preferably, the proppant is quartz sand or ceramsite.

Preferably, the processing specifications of the proppant are 20-40 mesh, 30-50 mesh, 40-70 mesh and 70-140 mesh.

Preferably, the color paste is an oily color paste.

Preferably, when adding the color paste, it is added at a speed of 1-2 kg per minute, and stirred for 3 minutes after the addition is completed.

Preferably, the ratio of the epoxy resin to the phenolic resin is 1:1.5.

Preferably, the color paste and the proppant are mixed by a concrete mixer.

The invention discloses an application of a resin coated colored sand fracturing proppant, wherein the resin coated colored sand fracturing proppant with different colors obtained above is applied to oil production.

It can be seen from the above technical scheme that the present application provides a resin-coated colored sand fracturing proppant. In the present application, proppants of different particle sizes are dyed by using color pastes of different colors. After uniform dyeing, a layer of resin is uniformly coated on the surface by heating. After the resin coating is uniformly cured, it is inspected and passed before use. During use, once sand production occurs in the oil well, the sand production specifications of the oil well can be quickly determined according to the color, and the proppant specifications can be changed.

Compared with the prior art, the present invention has the following beneficial effects:

1. By coating the color paste before the proppant is coated with resin, proppant with different particle sizes can be marked with different colors. During use, the color of the sand-producing proppant can be discovered in time, so as to make a quick judgment and replace it;

2. Through the coating treatment of the proppant, not only the fluidity of the proppant is improved, but also the strength of the proppant is further improved.

In summary, in this application, by performing different dyeing and coating treatments on proppants of different specifications, the specifications of the proppants can be determined by the color of the sand when sand production occurs, and the proppants can be replaced. At the same time, data support is provided for the same landform, thereby reducing the amount of sand production and increasing oil production.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation cases. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

FIG1 is a production process diagram of a resin-coated colored sand fracturing proppant proposed by the present invention.

DETAILED DESCRIPTION

In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

Referring to FIG1 , the colors of existing proppants are roughly the same. When sand is produced, it is not possible to determine which specification of proppant has the largest sand production according to the color of the sand. The present application performs different dyeing and coating treatments on proppants of different specifications. When sand is produced, the specification of the proppant can be determined by the color of the sand, and the proppant can be replaced. At the same time, data support is provided for the same landform, the sand production is reduced, and the oil production is increased. A specific resin-coated colored sand fracturing proppant comprises the following steps:

S1, select proppant that meets the standards. In this application, proppant with 20-40 mesh, 30-50 mesh, 40-70 mesh and 70-140 mesh is mainly processed. Proppants with different specifications are processed with different colors. When processing, take the required proppant and pour it into a mixer. The proppant is quartz sand or ceramsite, and stir it. The proppant needs to be dry and free of lumps;

S2, weighing 0.8-1.0% of the weight of the proppant color paste, the color paste is an oily color paste, the same specification of the proppant uses the same color paste, which is used to distinguish the specifications of the proppant. When the color difference in the proppant is relatively large, the specific gravity of the color paste can be increased to improve the uniformity of the color of the proppant, and the color paste is poured into the mixer to mix with sand. When pouring the color paste, add it at a speed of 1-2 kg per minute. After adding, stir for 3 minutes. The color paste and the proppant are stirred by a concrete mixer to make the color mixing uniform;

S3, adding the proppant coated with the color paste coating to the sand mixer. Due to the large production volume, the sand mixer and the stirrer work at the same time. The color is first mixed by the stirrer and then heated by the sand mixer to improve production efficiency. Specifically, it is heated to 180-240°C and stirred. The temperature is inversely proportional to the particle size. The smaller the particle size, the higher the temperature, which improves the adhesion effect.

S4, weigh 0.8-1.2% of epoxy resin and 1.2-1.8% of phenolic resin by weight of the proppant. When adding, the ratio of epoxy resin to phenolic resin can be 1:1.5. Under this ratio, the resin material has good adhesion and good corrosion resistance under solvents, and can be used in the complex environment of oil production. When adding, add it to the sand mixer, and it can be added at one time and stirred until the color is evenly mixed;

S5, weighing 15% of the weight of the resin hexamethylenetetramine and adding it into a sand mixer to solidify the resin material so that the proppant can maintain its state in a high temperature environment without falling off, stirring until the epoxy resin is solidified, cooling to room temperature, and continuously stirring during the cooling process;

S6, screening to obtain the resin coated colored sand fracturing proppant of the required specifications, and screening the qualified proppant, which not only has a uniform color, but also further improves the overall performance of the proppant product.

The present application also includes an application of a resin-coated colored sand fracturing proppant, and the resin-coated colored sand fracturing proppant of different colors obtained above is applied to oil production.

The following is a description based on the specific implementation methods;

Example 1

Weigh 800 kg of 20-40 mesh quartz sand, 6.4 kg of color paste, 6.4 kg of epoxy resin, 9.6 kg of phenolic resin and 2.4 kg of hexamethylenetetramine.

The quartz sand is sent to the mixer via a belt conveyor, and the color paste is added to the mixer and stirred for 3 minutes. After the colors are evenly mixed, the quartz sand coated with the color paste is sent to a sand mixer and heated to 220°C. Epoxy resin and phenolic resin are added. After stirring evenly, hexamethylenetetramine is added until the resin is fully cured and cooled to room temperature.

Example 2

Weigh 800 kg of 30-50 mesh quartz sand, 6.4 kg of color paste, 8 kg of epoxy resin, 12 kg of phenolic resin and 3 kg of hexamethylenetetramine.

The quartz sand is sent to the mixer via a belt conveyor, and the color paste is added to the mixer and stirred for 3 minutes. After the colors are evenly mixed, the quartz sand coated with the color paste is sent to a sand mixer and heated to 230°C. Epoxy resin and phenolic resin are added. After stirring evenly, hexamethylenetetramine is added until the resin is fully cured and cooled to room temperature.

Example 3

Weigh 800 kg of 40-70 mesh quartz sand, 6.4 kg of color paste, 8.2 kg of epoxy resin, 12.3 kg of phenolic resin and 3.075 kg of hexamethylenetetramine.

The quartz sand is sent to the mixer via a belt conveyor, and the color paste is added to the mixer and stirred for 3 minutes. After the colors are evenly mixed, the quartz sand coated with the color paste is sent to a sand mixer and heated to 230°C. Epoxy resin and phenolic resin are added. After stirring evenly, hexamethylenetetramine is added until the resin is fully cured and cooled to room temperature.

Example 4

Weigh 800kg of 40-70 mesh ceramsite, 6.4kg of color paste, 8.5kg of epoxy resin, 13kg of phenolic resin and 3.225kg of hexamethylenetetramine.

The quartz sand is sent to the mixer via a belt conveyor, and the color paste is added to the mixer and stirred for 3 minutes. After the colors are evenly mixed, the quartz sand coated with the color paste is sent to a sand mixer and heated to 230°C. Epoxy resin and phenolic resin are added. After stirring evenly, hexamethylenetetramine is added until the resin is fully cured and cooled to room temperature.

Example 5

Weigh 800 kg of 70-140 mesh ceramsite, 6.4 kg of color paste, 9.64 kg of epoxy resin, 14.4 kg of phenolic resin and 3.6 kg of hexamethylenetetramine.

The quartz sand is sent to the mixer via a belt conveyor, and the color paste is added to the mixer and stirred for 3 minutes. After the colors are evenly mixed, the quartz sand coated with the color paste is sent to a sand mixer and heated to 230°C. Epoxy resin and phenolic resin are added. After stirring evenly, hexamethylenetetramine is added until the resin is fully cured and cooled to room temperature.

The product obtained in the above example was sampled and analyzed to evaluate the stability of the proppant;

Specifically, the physical and chemical properties of the proppant are evaluated.

Take quartz sand with specifications of 20-40 mesh, 30-50 mesh, 40-70 mesh and 70-140 mesh, 8 samples of Example 1, Example 2, Example 3, Example 4 and Example 5, each sample has a mass of 100±0.1g, pour 100g of resin coated colored sand fracturing proppant sample into the discharged standard sieve top sieve, and then place the standard sieve on the vibrating sieve. After sieving for 10 minutes, weigh the proppant mass on each sieve and the bottom plate in turn, and calculate the mass fraction of each particle size range. If the cumulative amount differs from the sample by 0.5%, the sample should be replaced and retested.

Take one portion of each sample of Example 1, Example 2, Example 3, Example 4 and Example 5, and conduct an acid hydrolysis degree experiment. The acid solution adopts a soil acid system. The specific preparation method is the same as Chapter 8 of SY/T5108-2014 "Test Method for Performance of Proppants for Hydraulic Fracturing and Gravel Packing Operations". Dry an appropriate amount of the degelled proppant sample at 105°C for 1h, and then cool it in a dryer for 0.5h. Weigh 5g±0.001g of the treated proppant sample, add it to a 250ml polytetrafluoroethylene beaker, and pour the prepared soil acid solution into the beaker. Pour the weighed 5g sample into the beaker, and place the covered polytetrafluoroethylene beaker containing the acid solution and the proppant sample in a water bath at 66°C for 0.5h. Be careful not to stir it and not to contaminate it. Put the qualitative filter paper into a polytetrafluoroethylene Büchner funnel, dry it at 105°C for 1 hour, weigh and record its mass, and then put it on a vacuum filtration device for standby use. Pour the proppant sample and acid into the polytetrafluoroethylene Büchner funnel, make sure that all the proppant particles in the polytetrafluoroethylene beaker are poured into the polytetrafluoroethylene Büchner funnel, and then perform vacuum filtration to remove the acid within 1 minute. During the filtration process, rinse the proppant sample with distilled water for 3 times, each time with 20 ml of distilled water, until the pH value of the rinse liquid shows neutral. Put the polytetrafluoroethylene Büchner funnel and the proppant sample inside it into an oven and dry it at 105°C for at least 1 hour, then cool it in a dryer for 0.5 hour, weigh the cooled polytetrafluoroethylene Büchner funnel and the proppant sample together and record their mass.

Take one portion of each sample of Example 1, Example 2, Example 3, Example 4 and Example 5, and perform turbidity measurement. Put 30g of the proppant treated with gel breaking into a 250ml wide-mouth bottle, pour 100ml of distilled water into the wide-mouth bottle, let it stand for 30min, shake it horizontally back and forth by hand for 0.5min, 60 times (do not stir), let it stand for 5min, debug the turbidity meter, turn on the power of the instrument, and preheat for 30 minutes; ensure the cleanliness of the turbidity standard plate and the cuvette; perform air zeroing, adjust the turbidity standard plate to the calibration value, and adjust the distilled water zeroing in sequence, inject the prepared sample into the corresponding cuvette with a medical syringe according to the instrument instructions, put it into the instrument for measurement, and read the turbidity value directly from the instrument display.

Take 6 samples of each of Example 1, Example 2, Example 3, Example 4 and Example 5, and conduct anti-crushing ability test. Mix two identical proppants into a 200g sample, select the mesh size of the top sieve and the bottom sieve suitable for the proppant sample specifications, prepare the group sieve, and then put the group sieve into the sieve vibrator. Pour the proppant sample into the top sieve and cover it with a lid. Put the group sieve in the vibrating sieve machine and vibrate for 10 minutes, take out the group sieve, and pour out all the samples left in the top sieve and the bottom plate. Only the sample in the bottom sieve is left for the crushing rate experiment. The experimental method is in accordance with SY/T 5108-2014 "Proppant Performance Test Method for Hydraulic Fracturing and Gravel Packing Operations" Chapter 11.5 Proppant Crushing Rate Test Method, make 3 parallel samples for each sample, and take the arithmetic mean as the test result. The difference between each test value and the arithmetic mean is not more than 10%, and the numerical rounding of the test result is carried out according to GB/T 8170-2008.

In the present invention, the coated colored sand has a crushing rate of less than 9% under 52 MPa, and the crushing rate technical index of the provided sample can meet the use under the closed pressure formation condition of 52 MPa.

The colored sand was added in an infrared blast drying oven heated to 50°C and the heating was stopped until it cooled to room temperature, and the color did not change.

After the sample was stirred and settled 72 hours after soaking, the upper liquid was separated from the sample and placed in a beaker. A degumming agent (ammonium persulfate) was added to break the gel and observe whether there was any color change in the liquid. No color shell or color substance fell off at the bottom of the beaker, indicating that the coating shell of the colored sand was stable during the test. Due to limited laboratory testing time and equipment, the specific time period of aging of the coated sand cannot be determined. However, the research data shows that epoxy resin is an oil-resistant, acid-resistant and alkali-resistant material. This type of coated particles has an anti-aging time of about 10 years at formation temperature and formation pressure.

In the present invention, in this application, proppants of different particle sizes are dyed by using color pastes of different colors. After being uniformly dyed, a layer of resin is uniformly coated on the surface by heating. After the resin coating is uniformly cured, it is inspected and used. During use, once sand production occurs in the oil well, the sand production specifications of the oil well can be quickly determined according to the color, and the proppant specifications can be changed.

Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope of the present application is indicated by the claims.

It should be understood that the present application is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The above-described embodiments of the present application do not constitute a limitation on the scope of protection of the present application.

Claims (8)

1. A resin coated colored sand fracturing proppant, characterized in that it comprises the following steps: S1, select the proppant that meets the standards and pour it into the mixer; S2, weighing 0.8-1.0% of the weight of the proppant color paste, pouring the color paste into the mixer to mix with sand; S3, adding the color paste coated proppant to the sand mixer, heating to 180-240°C and stirring; S4, weighing 0.8-1.2% of the proppant weight of epoxy resin and 1.2-1.8% of phenolic resin, adding them into the sand mixer, and stirring until the mixture is uniform; S5, weighing 15% of the weight of the resin hexamethylenetetramine and adding it into the sand mixer, stirring until the epoxy resin is solidified, and cooling to room temperature; S6, screening to obtain resin-coated colored sand fracturing proppant of required specifications. 2. A resin-coated colored sand fracturing proppant according to claim 1, characterized in that the proppant is quartz sand or ceramsite. 3. A resin-coated colored sand fracturing proppant according to claim 2, characterized in that the processing specifications of the proppant are 20-40 mesh, 30-50 mesh, 40-70 mesh and 70-140 mesh. 4. The resin-coated colored sand fracturing proppant according to claim 1, characterized in that the color paste is an oily color paste. 5. The resin-coated colored sand fracturing proppant according to claim 1, characterized in that when adding the color paste, it is added at a speed of 1-2 kg per minute, and stirred for 3 minutes after the addition is completed. 6. The resin-coated colored sand fracturing proppant according to claim 1, characterized in that the ratio of the epoxy resin to the phenolic resin is 1:1.5. 7. The resin-coated colored sand fracturing proppant according to claim 1, characterized in that the color paste and the proppant are stirred by a concrete mixer. 8. An application of a resin-coated colored sand fracturing proppant, characterized in that the resin-coated colored sand fracturing proppant of different colors obtained according to any one of claims 1 to 7 is applied to oil production.

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