Temporary plugging rubber-coated ball and manufacturing method thereof
By using soluble polytetrafluoroethylene and nonionic surfactant materials in the silencing ball, combined with the combination of ammonium persulfate microcapsule debonding agent, a temporary plug with good temporary plugging effect and degradable temporary plugging under high temperature conditions was prepared. The glue-covered ball solves the problems of non-degradable and poor high-temperature effects in the prior art, and achieves a temporary plugging effect with low cost and significant effect.
Patent Information
- Application Number
- CN202310865123.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-14
- Publication Date
- 2024-12-10
AI Technical Summary
The existing temporary blocking balls cannot be degraded or cannot be ablated, and they need to be redischarged after fracturing, which is time-consuming and labor-intensive. The temporary blocking effect is poor or the amount is large under high temperature conditions, resulting in high cost and unsatisfactory use.
Using soluble polytetrafluoroethylene, nonionic surfactant and ammonium persulfate microcapsule breaker, the temporary blocking rubber ball is prepared through a specific process to enhance mechanical strength and elasticity, effectively degrade under high temperature conditions, and reduce the amount of use. and cost.
The good effect of temporary plugging balls under high temperature conditions has been achieved, the degradation ability is strong, the reflux operation is avoided, the use is easy, the cost and construction complexity is reduced, and the operation is completed while protecting the formation.
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of petrochemical industry, in particular to a temporary plugging rubber ball and a manufacturing method thereof. Background Art
[0002] In recent years, with the continuous exploitation of oil and gas fields, the quality of reservoirs will decline year by year. For this reason, relevant oil and gas producers mostly use reservoir fracturing transformation to improve the permeability of underground reservoirs in order to continue to effectively exploit oil and gas resources from these underground reservoirs. Due to the influence of various development factors, oil wells have problems such as sand burial and severe wax deposition, and well repair, well washing, sand flushing and other operations are required. Due to the existence of large pores or high permeability layers in the formation, the operating fluids such as well repair fluid, well washing fluid, and sand flushing fluid enter the oil well and are lost in large quantities in the formation, causing serious pollution to the formation. At the same time, the operating fluid cannot be completely returned to the ground, and the operating effect cannot be achieved, resulting in operation failure. At this time, it is necessary to perform temporary plugging operations on the large pores or temporary plugging balls in the formation.
[0003] The function of temporary plugging balls is to temporarily plug the perforations of shallow fracturing in the formation, and priority is given to fracturing the perforations in the low permeability layers of the formation with greater flow resistance. The materials of existing plugging balls are often non-degradable or cannot be dissolved, and backflow is often required after fracturing, which is time-consuming and labor-intensive. Moreover, the temporary plugging effect of traditional temporary plugging balls is not very good under high temperature conditions greater than 200°C, or the large amount used leads to high costs, resulting in unsatisfactory results. Summary of the invention
[0004] In view of the deficiencies in the prior art, the present invention provides a temporary plugging rubber-coated ball and a method for manufacturing the same, which solves the problem that the prior art plugging balls are non-degradable or cannot be dissolved, and flowback is often required after fracturing, which is time-consuming and labor-intensive. In addition, the traditional temporary plugging balls do not have a very good temporary plugging effect under high temperature conditions greater than 200°C, or the large amount used leads to high costs, resulting in unsatisfactory use effects.
[0005] To achieve the above purpose, the present invention is implemented through the following technical scheme: a temporary plugging rubber ball, comprising the following raw materials in mass fraction: 20 to 45 parts of soluble polytetrafluoroethylene, 10 to 15 parts of non-ionic surfactant, 15 to 30 parts of ammonium persulfate microcapsule breaker, 30 to 45 parts of terephthalic acid, 11 to 17 parts of cosolvent, 12 to 20 parts of deionized water, 17 to 25 parts of acrylic acid, 7 to 15 parts of paraformaldehyde, and 12 to 20 parts of starch.
[0006] Preferably, the nonionic surfactant is one or a combination of polyethylene glycol, polyvinyl alcohol, anionic polyethoxyethanol, polyvinyl chloride stearate, octylphenol sulfate polyoxyethylene ether, and dodecyl alcohol ethoxylate.
[0007] Preferably, the co-solvent is one or a combination of propylene glycol, ethylene glycol, methanol, and chlorinated hydrocarbons.
[0008] Preferably, the deionized water is one or more combinations of DI water and reverse osmosis water.
[0009] Preferably, the ammonium persulfate microcapsule breaker is styrene-acrylic emulsion coated ammonium persulfate obtained by boiling granulation technology, and the mass ratio of styrene-acrylic emulsion to ammonium persulfate is 1:1.7.
[0010] A method for manufacturing a temporary plugging rubber ball comprises the following steps:
[0011] S1. Mixing soluble polytetrafluoroethylene and nonionic surfactant in a stirring kettle at a temperature above 300° C. to obtain a clinker, and then stopping heating;
[0012] S2, adding terephthalic acid and a cosolvent to the aqueous solution in sequence, and stirring until dissolved, and then adding acrylic acid to react for 3 hours to finally obtain a copolyester;
[0013] S3, melting the copolyester at 150° C., adding paraformaldehyde and stirring in a stirring kettle, and then standing for 15 to 70 minutes to obtain a solution A;
[0014] S4, adding ammonium persulfate microcapsule breaker to solution A, adding while stirring, and passing nitrogen into the solution for 40 to 60 minutes, then adding starch, continuing to pass nitrogen until the solution is viscous, and polymerizing in a constant temperature water bath to generate a polymer;
[0015] S5, washing, drying and granulating the product after the above polymerization reaction to obtain temporary plugging rubber balls.
[0016] In step S1, the stirring speed of the stirring kettle is 90-155 r / min, the humidity is adjusted to 35-40%, and the temperature is controlled at 125-155°C.
[0017] In step S3, the stirring speed of the stirring kettle is 80-100 r / min, the humidity is adjusted to 40-60%, and the temperature is controlled at 130-160°C.
[0018] The reaction temperature when nitrogen is added in step S2 is 250° C. and the pressure is 750 MPa.
[0019] The constant temperature of the water bath in step S4 is 50°C.
[0020] The present invention provides a temporary plugging rubber ball and a manufacturing method thereof, which has the following beneficial effects:
[0021] 1. The present invention adds ammonium persulfate microcapsule degelling agent and non-ionic surfactant and the like to cooperate with each other, so that the temporary plugging ball is easy to control during the preparation reaction process, does not produce a large amount of by-products, and is easy to obtain a large amount of target products. The temporary plugging ball has good mechanical strength and elasticity, can resist pressure well and effectively degrade, can be quickly dissolved in the downhole environment, does not require fracturing reverse operation, and is convenient for people to use.
[0022] 2. The present invention adds soluble polytetrafluoroethylene so that the temporary plugging ball can still be used under high temperature conditions greater than 200°C, and has a good temporary plugging effect and a low dosage, resulting in low cost. The construction process is simple and the effect is significant, achieving the dual purpose of protecting the formation while completing the operation. DETAILED DESCRIPTION
[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0024] Embodiment 1:
[0025] The embodiment of the present invention provides a temporary plugging coated rubber ball, which includes the following raw materials in mass fractions: 30 parts of soluble polytetrafluoroethylene, 11 parts of non-ionic surfactant, 17 parts of ammonium persulfate microcapsule breaker, 31 parts of terephthalic acid, 12 parts of co-solvent, 18 parts of deionized water, 18 parts of acrylic acid, 8 parts of paraformaldehyde, and 15 parts of starch.
[0026] The nonionic surfactant is polyethylene glycol.
[0027] The cosolvent is a chlorinated hydrocarbon.
[0028] Deionized water is reverse osmosis water.
[0029] The ammonium persulfate microcapsule breaker is a styrene-acrylic emulsion coated with ammonium persulfate obtained by boiling granulation technology, and the mass ratio of the styrene-acrylic emulsion to the ammonium persulfate is 1:1.7.
[0030] A method for manufacturing a temporary plugging rubber ball comprises the following steps.
[0031] S1. Mix soluble polytetrafluoroethylene and nonionic surfactant in a stirring kettle at a temperature above 300°C to obtain clinker, then stop heating, stir the kettle at a speed of 98r / min, adjust the humidity to 36%, and control the temperature at 140°C.
[0032] S2. Add terephthalic acid and a cosolvent to the aqueous solution in sequence and stir until dissolved, then add acrylic acid and react for 3 hours to finally obtain copolyester. When nitrogen is added, the reaction temperature is 250° C. and the pressure is 750 MPa.
[0033] S3. Melt the copolyester at 150°C, add paraformaldehyde and stir well in a stirring kettle, then let stand for 36 minutes to obtain solution A. The stirring speed of the stirring kettle is 90 r / min, the humidity is adjusted to 56%, and the temperature is controlled at 136°C.
[0034] S4. Add ammonium persulfate microcapsule breaker to solution A while stirring, and pass nitrogen into the solution for 50 minutes. Then add starch, continue to pass nitrogen until the solution becomes viscous, and polymerize in a constant temperature water bath to generate a polymer. The constant temperature of the water bath in step S4 is 50°C.
[0035] S5, washing, drying and granulating the product after the above polymerization reaction to obtain temporary plugging rubber balls.
[0036] Embodiment 2:
[0037] The embodiment of the present invention provides a method for manufacturing a temporary plugging coated rubber ball, comprising the following raw materials in mass fraction: 26 parts of soluble polytetrafluoroethylene, 12 parts of nonionic surfactant, 18 parts of ammonium persulfate microcapsule breaker, 34 parts of terephthalic acid, 15 parts of co-solvent, 19 parts of deionized water, 19 parts of acrylic acid, and 7 parts of paraformaldehyde. The remaining steps are consistent with the experimental steps and methods of Example 1, and are characterized by the same method. The plugging effect, dissolution effect, and high temperature resistance effect of the temporary plugging ball finally obtained are shown in Table 1 below.
[0038] Embodiment three:
[0039] The embodiment of the present invention provides a method for manufacturing a temporary plugging coated rubber ball, comprising the following raw materials in mass fraction: 30 parts of soluble polytetrafluoroethylene, 12 parts of nonionic surfactant, 30 parts of ammonium persulfate microcapsule breaker, 41 parts of terephthalic acid, and 8 parts of polyformaldehyde. The remaining steps are consistent with the experimental steps and methods of Example 1, and are characterized by the same method. The plugging effect, dissolution effect, and high temperature resistance effect of the temporary plugging ball finally obtained are shown in Table 1 below.
[0040] Embodiment 4:
[0041] The embodiment of the present invention provides a method for manufacturing a temporary plugging coated rubber ball, comprising the following raw materials in mass fraction: 45 parts of soluble polytetrafluoroethylene, 15 parts of nonionic surfactant, 29 parts of ammonium persulfate microcapsule breaker, 44 parts of terephthalic acid, and 14 parts of polyformaldehyde. The remaining steps are consistent with the experimental steps and methods of Example 1, and are characterized by the same method. The plugging effect, dissolution effect, and high temperature resistance effect of the temporary plugging ball finally obtained are shown in Table 1 below.
[0042] Embodiment five:
[0043] The embodiment of the present invention provides a method for manufacturing a temporary plugging coated rubber ball, comprising the following raw materials in mass fraction: 43 parts of soluble polytetrafluoroethylene, 11 parts of nonionic surfactant, 20 parts of ammonium persulfate microcapsule breaker, 35 parts of terephthalic acid, and 14 parts of polyformaldehyde. The remaining steps are consistent with the experimental steps and methods of Example 1, and are characterized by the same method. The plugging effect, dissolution effect, and high temperature resistance effect of the temporary plugging ball finally obtained are shown in Table 1 below.
[0044] Example 6: The embodiment of the present invention provides a method for manufacturing a temporary plugging coated rubber ball, comprising the following raw materials in mass fraction: 42 parts of soluble polytetrafluoroethylene, 14 parts of non-ionic surfactant, 17 parts of ammonium persulfate microcapsule breaker, 35 parts of terephthalic acid, and 15 parts of polyformaldehyde. The remaining steps are consistent with the experimental steps and methods of Example 1, and are characterized by the same method. The plugging effect, dissolution effect, and high temperature resistance effect of the temporary plugging ball finally obtained are shown in Table 1 below.
[0045] Example 7: The embodiment of the present invention provides a method for manufacturing a temporary plugging coated rubber ball, wherein the soluble polytetrafluoroethylene in Example 1 is removed, and the remaining steps are consistent with the experimental steps and methods of Example 1, and are characterized by the same method. The plugging effect, dissolution effect, and high temperature resistance effect of the temporary plugging ball finally obtained are shown in Table 1 below.
[0046] Example 8: The embodiment of the present invention provides a method for manufacturing a temporary plugging coated rubber ball, wherein the nonionic surfactant in Example 1 is removed, and the remaining steps are consistent with the experimental steps and methods of Example 1, and are characterized by the same method. The plugging effect, dissolution effect, and high temperature resistance effect of the temporary plugging ball finally obtained are shown in Table 1 below.
[0047] Example 9: The embodiment of the present invention provides a method for manufacturing a temporary plugging coated rubber ball, wherein the ammonium persulfate microcapsule breaker in Example 1 is removed, and the remaining steps are consistent with the experimental steps and methods of Example 1, and are characterized by the same method. The plugging effect, dissolution effect, and high temperature resistance effect of the temporary plugging ball finally obtained are shown in Table 1 below.
[0048]
[0049]
[0050] Table 1
[0051] Conclusion: It can be seen from Table 1 that the present invention adds ammonium persulfate microcapsule degelling agent and non-ionic surfactant and the like to cooperate with each other, so that the temporary plugging ball is easy to control in the preparation reaction process, does not produce a large amount of by-products, and is easy to obtain a large amount of target products. The temporary plugging ball has good mechanical strength and elasticity, can resist pressure well and effectively degrade, can be quickly dissolved in the downhole environment, does not need to be subjected to fracturing reverse operation, and is convenient for people to use. By adding soluble polytetrafluoroethylene, the temporary plugging ball can still be used under high temperature conditions, and has a good temporary plugging effect and a low dosage, resulting in low cost. The construction process is simple and the effect is significant, achieving the dual purpose of protecting the formation while completing the operation.
[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A temporary plugging rubber ball, It is characterized in that The invention comprises the following raw materials in mass fractions: 20-45 parts of soluble polytetrafluoroethylene, 10-15 parts of nonionic surfactant, 15-30 parts of ammonium persulfate microcapsule breaker, 30-45 parts of terephthalic acid, 11-17 parts of cosolvent, 12-20 parts of deionized water, 17-25 parts of acrylic acid, 7-15 parts of polyformaldehyde and 12-20 parts of starch.
2. A temporary plugging rubber-coated ball according to claim 1, It is characterized in that The nonionic surfactant is one or a combination of polyethylene glycol, polyvinyl alcohol, anionic polyethoxyethanol, polyvinyl chloride stearate, octylphenol sulfate polyoxyethylene ether, and dodecyl alcohol ethoxylate.
3. The temporary plugging rubber ball according to claim 1, Features: The co-solvent is one or a combination of propylene glycol, ethylene glycol, methanol, and chlorinated hydrocarbons.
4. The temporary plugging rubber ball according to claim 1, It is characterized in that The deionized water is one or a combination of DI water and reverse osmosis water.
5. The temporary plugging rubber-coated ball according to claim 1, It is characterized in that The ammonium persulfate microcapsule breaker is a styrene-acrylic emulsion coated with ammonium persulfate obtained by boiling granulation technology, and the mass ratio of the styrene-acrylic emulsion to the ammonium persulfate is 1:1.
7.
6. A method for manufacturing a temporary plugging rubber ball, It is characterized in that A temporary plugging rubber ball according to any one of claims 1 to 4, comprising the following steps: S1. Mixing soluble polytetrafluoroethylene and nonionic surfactant in a stirring kettle at a temperature above 300° C. to obtain a clinker, and then stopping heating; S2, adding terephthalic acid and a cosolvent to the aqueous solution in sequence, and stirring until dissolved, and then adding acrylic acid to react for 3 hours to finally obtain a copolyester; S3, melting the copolyester at 150° C., adding paraformaldehyde and stirring in a stirring kettle, and then standing for 15 to 70 minutes to obtain a solution A; S4, adding ammonium persulfate microcapsule breaker to solution A, adding while stirring, and passing nitrogen into the solution for 40 to 60 minutes, then adding starch, and continuing to pass nitrogen until the solution is viscous, and polymerizing in a constant temperature water bath to generate a polymer; S5, washing, drying and granulating the product after the above polymerization reaction to obtain temporary plugging rubber balls.
7. A method for manufacturing a temporary plugging rubber ball according to claim 6, It is characterized in that In step S1, the stirring speed of the stirring kettle is 90-155 r / min, the humidity is adjusted to 35-40%, and the temperature is controlled at 125-155°C.
8. The method for manufacturing a temporary plugging rubber ball according to claim 6, It is characterized in that In step S3, the stirring speed of the stirring kettle is 80-100 r / min, the humidity is adjusted to 40-60%, and the temperature is controlled at 130-160°C.
9. The method for manufacturing a temporary plugging rubber-coated ball according to claim 1, It is characterized in that The reaction temperature when nitrogen is added in step S2 is 250° C. and the pressure is 750 MPa.
10. The method for manufacturing a temporary plugging rubber-coated ball according to claim 1, It is characterized in that The constant temperature of the water bath in step S4 is 50°C.