CN112300774B - Preparation method of water-controlled oxidation gel-breaking self-suspension proppant for fracturing - Google Patents
Preparation method of water-controlled oxidation gel-breaking self-suspension proppant for fracturing Download PDFInfo
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- CN112300774B CN112300774B CN202010908522.7A CN202010908522A CN112300774B CN 112300774 B CN112300774 B CN 112300774B CN 202010908522 A CN202010908522 A CN 202010908522A CN 112300774 B CN112300774 B CN 112300774B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
- C09K8/805—Coated proppants
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/26—Gel breakers other than bacteria or enzymes
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Abstract
The invention discloses a preparation method of a water-controlled oxidation gel-breaking self-suspending proppant for fracturing, which comprises the following steps: adding 15-25 wt% of monomer raw materials into 200mL of toluene or acetone solvent, fully stirring to enable the monomer raw materials to be uniformly dissolved in the solvent, and respectively adding 0.2-0.4 wt% of initiator, 2-3 wt% of cross-linking agent and 0.1 wt% of strong oxidation gel breaker under stirring; then adding 40-60 wt% of proppant in the total liquid amount, and uniformly suspending and dispersing the proppant in the reaction system under stirring; the reaction system is stirred at the temperature of 30-40 ℃ to react until the viscosity of the system is increased, the stirring speed is reduced, the system is naturally placed for 2-4 hours, and finally, filtration is carried out, and solid phase cooling is carried out, thus obtaining the water-controlled oxidation gel-breaking self-suspending proppant. The controllable gel-breaking self-suspending proppant obtained by the invention has strong dispersibility in water and lower apparent density, and has important significance for fracturing in oil gas production increase.
Description
Technical Field
The invention belongs to the technical field of oil-gas fracturing yield increase, and particularly relates to a preparation method of a water-controlled oxidation gel-breaking self-suspension proppant for fracturing.
Background
With the development of shale gas and deep well ultra-deep wells, large fracturing becomes one of effective measures for reservoir transformation, and in order to improve the conductivity of fluid after fracturing, a proppant needs to be added in the fracturing process. However, in order to overcome the settlement of a tank body, a pipeline and a stratum near a well zone in the construction process of the proppant, a certain amount of thickening base or crosslinked gel liquid needs to be added. The thickening agent and the gel liquid have high viscosity and are sensitive to temperature and mineralization degree, so that the injection pressure is increased, the construction process is complex, or the stability of the thickening agent gel liquid is influenced, the suspension capacity of the proppant is influenced, the settlement of the proppant is caused, and the expected fracturing effect cannot be achieved.
At present, self-suspending proppants are researched at home and abroad, and the main method is that a layer of water-swellable resin material is covered on the surface of the proppant to prepare the proppant, the proppant can absorb water and swell when meeting water, the density of the proppant is reduced to a certain extent, and the self-suspending function is realized, but the proppant enters a stratum, after fracturing construction is completed, the pressure of the stratum is closed, the proppant is extruded, and because the water-swellable resin on the surface of the proppant is more tightly extruded among suspended proppant particles under the influence of the pressure, the permeability of the stratum is greatly reduced, and even the proppant can be completely blocked. How to realize self-suspension dispersion of the proppant and not influence the formation permeability is a difficult problem in the research of the fracturing fluid proppant at present.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a preparation method of a water-controlled oxidation gel-breaking self-suspending proppant for fracturing.
The technical scheme provided by the invention for solving the technical problems is as follows: a preparation method of a water-controlled oxidation gel-breaking self-suspending proppant for fracturing comprises the following steps:
adding 15-25 wt% of monomer raw materials into 200mL of toluene or acetone solvent, fully stirring to enable the monomer raw materials to be uniformly dissolved in the solvent, and respectively adding 0.2-0.4 wt% of initiator, 2-3 wt% of cross-linking agent and 0.1 wt% of strong oxidation gel breaker under stirring; then adding 40-60 wt% of proppant in the total liquid amount, and uniformly suspending and dispersing the proppant in the reaction system under stirring; the whole reaction system is stirred and reacted at the temperature of 30-40 ℃ until the viscosity of the system is increased, the stirring speed is reduced, the reaction system is naturally placed for 2-4 hours, and finally, filtration and solid-phase cooling are carried out, so that the prepared water-controlled oxidation gel-breaking self-suspension proppant is obtained.
The action mechanism of the invention is as follows: the surface of the proppant is covered with a layer of oleophylic resin, so when the fracturing fluid is prepared, the proppant does not absorb water, does not expand and is not easy to sink, the proppant can be dispersed in water as long as a few dispersing agents are added during the preparation of the fracturing fluid, the proppant enters a stratum along with the fluid, after the fracturing construction is finished, the proppant is left in a stratum crack, the resin on the surface layer is slowly degraded under the action of temperature, the oxidant is released for further oxidation, the degradation of the resin on the surface layer of the proppant is accelerated and is discharged along with a flowback fluid, and the left quartz sand and ceramsite can completely realize the effect of increasing the permeability of the stratum.
The further technical scheme is that the monomer is one or more of alkyl styrene, alkyl methacrylate, vinyl acetate and vinyl chloride.
The further technical scheme is that the initiator is benzoyl peroxide.
The further technical proposal is that the cross-linking agent is divinylbenzene or diisopropylbenzene peroxide.
The further technical scheme is that the strong oxidation gel breaker is one of potassium ferrate, potassium permanganate and potassium perchlorate.
The further technical scheme is that the proppant is quartz sand or ceramsite.
Compared with the prior art, the method has the following advantages: the controllable gel breaking self-suspending proppant with strong dispersibility in water and lower apparent density is obtained by reacting to form a lipophilic resin coating material on the surface of the proppant based on the strength characteristic of quartz sand or ceramsite and adding a water-controllable strong oxidation gel breaker into a resin raw material formed by the reaction, and has important significance for fracturing in oil and gas yield increase.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
Adding 200mL of toluene or acetone solvent into a four-neck flask, adding 15 wt% of monomer raw material), fully stirring to uniformly dissolve the monomer raw material in the solvent, respectively adding 0.2 wt% of initiator, 2.0 wt% of cross-linking agent and 0.1 wt% of strong oxidation gel breaker under stirring, then adding 40 wt% of ceramsite of the total liquid amount, and uniformly suspending and dispersing the ceramsite in a reaction system under stirring; the whole system reacts under stirring at 30 ℃ until the viscosity of the system is increased, and naturally stands for 2 hours after the stirring speed is reduced; and finally, filtering, and cooling the solid phase to obtain the water-controlled oxidation gel-breaking self-suspending proppant prepared in the example 1.
The experiment was carried out on the water-controlled oxidative gel-breaking self-suspending proppant prepared in example 1:
adding 80mL of clear water into a 100mL measuring cylinder with a plug, adding 0.2 wt% of surfactant dispersant, and adding 20-40 wt% of self-suspending proppant;
testing and analyzing the sinking speed of the proppant in water without stirring at the temperature of 60-90 ℃; then stirring for 5min, and observing the dispersibility of the proppant in water; and (3) plugging the measuring cylinder, standing in a water bath at the temperature of 60-90 ℃ for 8 hours, and analyzing the change of the removal rate of the resin on the surface of the ceramsite proppant.
TABLE 1 analysis of experimental data
Example 2
Adding 200mL of toluene or acetone solvent into a four-neck flask, adding 25 wt% of monomer raw material, fully stirring to uniformly dissolve the monomer raw material in the solvent, respectively adding 0.4 wt% of initiator, 3.0 wt% of cross-linking agent and 0.1 wt% of strong oxidation gel breaker under stirring, then adding 40 wt% of ceramsite of the total liquid amount, and uniformly suspending and dispersing the ceramsite in a reaction system under stirring; the whole system is stirred and reacted at the temperature of 30 ℃ until the viscosity of the system is increased, and after the stirring speed is reduced, the whole system is naturally placed for 2 hours; and (3) filtering, and cooling the solid phase to obtain the water-controlled oxidation gel-breaking self-suspending proppant prepared in the example 2.
The experiment was carried out on the water-controlled oxidative gel-breaking self-suspending proppant prepared in example 2:
adding 80mL of clear water into a 100mL measuring cylinder with a plug, adding 0.2 wt% of surfactant dispersant, and adding 20-40 wt% of temperature-controlled oxidation gel-breaking self-suspending proppant; testing and analyzing the sinking speed of the proppant in water without stirring at the temperature of 60-90 ℃; then stirring for 5min, and observing the dispersibility of the proppant in water; and (3) plugging the measuring cylinder, standing in a water bath at the temperature of 60-90 ℃ for 8 hours, and analyzing the change of the removal rate of the resin on the surface of the ceramsite proppant.
TABLE 2 analysis of experimental data
Example 3
Adding 200mL of toluene or acetone solvent into a four-neck flask, adding 20 wt% of monomer raw material, fully stirring to uniformly dissolve the monomer raw material in the solvent, respectively adding 0.3 wt% of initiator, 2.5 wt% of cross-linking agent and 0.1 wt% of strong oxidation gel breaker under stirring, then adding 40 wt% of ceramsite of the total liquid amount, and uniformly suspending and dispersing the ceramsite in a reaction system under stirring; the whole system is stirred and reacted at the temperature of 30 ℃ until the viscosity of the system is increased, and after the stirring speed is reduced, the whole system is naturally placed for 2 hours; and (3) filtering, and cooling the solid phase to obtain the water-controlled oxidation gel-breaking self-suspending proppant prepared in example 3.
The experiment was performed on the water-controlled oxidative gel-breaking self-suspending proppant prepared in example 3:
adding 80mL of clear water into a 100mL measuring cylinder with a plug, adding 0.2 wt% of surfactant dispersant, and adding 20-40 wt% of temperature-controlled oxidation gel-breaking self-suspending proppant; testing and analyzing the sinking speed of the proppant in water without stirring at the temperature of 60-90 ℃; then stirring for 5min, and observing the dispersibility of the proppant in water; and (3) plugging the measuring cylinder, standing in a water bath at the temperature of 60-90 ℃ for 8 hours, and analyzing the change of the removal rate of the resin on the surface of the ceramsite proppant.
TABLE 3 analysis of experimental data
From the three examples, the research on the dispersibility, the settling velocity and the resin removal effect of the temperature-controlled oxidation gel-breaking self-suspending proppant prepared under different conditions at different temperatures and different proppant adding amounts shows that: the proppant prepared under different conditions can be uniformly distributed in water under the action of 0.2 percent of dispersant; the sedimentation speed of the same amount of the proppant at different temperatures is reduced along with the temperature rise, namely the temperature rise is beneficial to improving the suspension stability of the proppant; the gel breaker release speed in the propping agent is different at different temperatures, different oxidation gel breaking performances are reflected, and the release speed of the oxidant is faster along with the rise of the temperature, so that the oxidative decomposition of the resin on the surface of the propping agent is better, the removal rate of the resin on the surface of the propping agent is higher, the gel breaker is easier to flowback during gel breaking flowback, and the formation permeability of the propping agent can be well maintained after fracturing fluid is fractured.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (3)
1. A preparation method of a water-controlled oxidation gel-breaking self-suspending proppant for fracturing is characterized by comprising the following steps: adding 15-25 wt% of monomer raw materials into 200mL of toluene or acetone solvent, fully stirring to enable the monomer raw materials to be uniformly dissolved in the solvent, and respectively adding 0.2-0.4 wt% of initiator, 2-3 wt% of cross-linking agent and 0.1 wt% of strong oxidation gel breaker under stirring; then adding 40-60 wt% of proppant in the total liquid amount, and uniformly suspending and dispersing the proppant in the reaction system under stirring; the whole reaction system is stirred and reacted at the temperature of 30-40 ℃ until the viscosity of the system is increased, the stirring speed is reduced, the reaction system is naturally placed for 2-4 hours, and finally, filtration is carried out, and solid phase cooling is carried out, thus obtaining the prepared water-controlled oxidation gel-breaking self-suspending proppant;
the monomer is one or more of alkyl styrene, alkyl methacrylate, vinyl acetate and vinyl chloride;
the strong oxidation gel breaker is one of potassium ferrate, potassium permanganate and potassium perchlorate;
the proppant is quartz sand or ceramsite.
2. The preparation method of the water-controlled oxidation gel breaking self-suspending proppant for fracturing as claimed in claim 1, wherein the initiator is benzoyl peroxide.
3. The preparation method of the water-controlled oxidative gel breaking self-suspending proppant for fracturing, according to claim 1, wherein the cross-linking agent is divinylbenzene or diisopropylbenzene peroxide.
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