CN108587587B - High-strength degradable temporary plugging ball for oil and gas well as preparation method and application of temporary plugging ball - Google Patents
High-strength degradable temporary plugging ball for oil and gas well as preparation method and application of temporary plugging ball Download PDFInfo
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- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G81/00—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers
- C08G81/02—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers at least one of the polymers being obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C08G81/024—Block or graft polymers containing sequences of polymers of C08C or C08F and of polymers of C08G
- C08G81/027—Block or graft polymers containing sequences of polymers of C08C or C08F and of polymers of C08G containing polyester or polycarbonate sequences
Abstract
The invention provides a high-strength degradable oil and gas well temporary plugging ball and a preparation method and application thereof, wherein the high-strength degradable oil and gas well temporary plugging ball is mainly prepared by reacting the following components: the adhesive comprises polyacrylamide, polyethylene wax, boron carbide, a thermoplastic polymer, sesbania gum, benzotriazole and 4, 4-diaminodiphenylamide, wherein the mass ratio of the polyacrylamide to the polyethylene wax to the boron carbide to the thermoplastic polymer to the sesbania gum to the benzotriazole to the 4, 4-diaminodiphenylamide is 1-2:1-2:0.5-1:2-3:1-2:0.5-1: 0.5-1. The temporary plugging ball has good dissolubility or degradability, no selection on the environment of water quality of dissolution or degradation, wide applicable geographic environment and temperature environment range, good bearing strength, elastic deformation capacity and sealing performance on blastholes, can form good sealing plugging on blastholes with irregular sizes and has high plugging success rate.
Description
Technical Field
The invention relates to a high-strength degradable temporary plugging ball for an oil and gas well as a preparation method and application thereof, belonging to the technical field of oil exploitation.
Background
The shale oil-gas reservoir is a typical unconventional natural oil-gas reservoir with ultra-low permeability and low porosity, the resource occupies a great proportion in oil-gas resources in China, but the shale oil-gas reservoir has special geological conditions and high development difficulty, the conventional development technology cannot be applied to the shale oil-gas reservoir, the shale reservoir can be broken by the volume fracturing technology at present, cracks are increased, the gas leakage area is increased, and the productivity is improved.
However, due to shale oil and gas reservoir geological well spacing, the well spacing is 300m, the distance is short, and large-scale fracturing enables adjacent well casings which are not fractured to be easily deformed; and the tools are lifted down for many times in the field fracturing construction process, so that the integrity of partial shale oil-gas well shafts is also caused to be in a problem, even the casing is deformed, the bridge plug cannot be smoothly lowered in the later fracturing operation, the bridge plug cannot be smoothly drilled and ground by a continuous oil pipe, even partial well sections are forced to give up the fracturing operation, and the single well yield of the shale oil-gas well is influenced.
Or some shale oil-gas wells are not effectively transformed in the whole well-bore range due to the fact that drilling operation fails to drill a high-quality reservoir, or the selection of a stratum is improper during fracturing, or is limited by the influence of operation factors such as construction materials and equipment power during fracturing transformation, so that the well completion index is low, and the reservoir cracks gradually lose effectiveness due to the fact that the flow conductivity is greatly reduced when some shale oil-gas wells are drained and mined in the later period due to improper production system selection, so that the single-well yield of the shale oil-gas wells is influenced.
In order to completely transform a shale oil and gas new well with damaged well bore integrity, or reduce the lowering times of downhole tools, or obtain high yield again from an old shale oil and gas horizontal well, the target well section is subjected to general temporary plugging volume fracturing. The precondition of the success of the technology is that the temporary plugging material successfully plugs the transformed well section, thereby putting higher requirements on the performance of the temporary plugging material. The invention aims to prepare a high-strength degradable temporary plugging ball for an oil and gas well, which can plug perforation holes of a fractured perforation section, is degradable after fracturing construction, has no residues, does not influence next production, and meets the requirement of site fracturing.
Disclosure of Invention
In order to solve the above disadvantages and shortcomings, the present invention provides a high strength degradable temporary plugging ball for oil and gas wells.
The invention also aims to provide a preparation method of the high-strength degradable oil and gas well temporary plugging ball.
The invention also aims to provide application of the high-strength degradable oil and gas well temporary plugging ball in oil and gas well temporary plugging treatment.
The invention also aims to provide a treatment method for temporarily blocking the oil and gas well by applying the high-strength degradable oil and gas well temporary blocking ball.
In order to achieve the purpose, the invention provides a high-strength degradable oil and gas well temporary plugging ball, wherein the high-strength degradable oil and gas well temporary plugging ball is mainly prepared by reacting the following components: the adhesive comprises polyacrylamide, polyethylene wax, boron carbide, a thermoplastic polymer, sesbania gum, benzotriazole and 4, 4-diaminodiphenylamide, wherein the mass ratio of the polyacrylamide to the polyethylene wax to the boron carbide to the thermoplastic polymer to the sesbania gum to the benzotriazole to the 4, 4-diaminodiphenylamide is 1-2:1-2:0.5-1:2-3:1-2:0.5-1: 0.5-1.
In a more preferred embodiment of the invention, the high-strength degradable temporary plugging ball for oil and gas wells is mainly prepared by reacting the following components: the adhesive comprises polyacrylamide, polyethylene wax, boron carbide, thermoplastic polyether ester, sesbania gum, benzotriazole and 4, 4-diaminodiphenyl amide, wherein the mass ratio of the polyacrylamide to the polyethylene wax to the boron carbide to the thermoplastic polyether ester to the sesbania gum to the benzotriazole to the 4, 4-diaminodiphenyl amide is 2:1.8:1:2.3:1.8:0.6: 0.5.
In a more preferred embodiment of the invention, the high-strength degradable temporary plugging ball for oil and gas wells is mainly prepared by reacting the following components: the adhesive comprises polyacrylamide, polyethylene wax, boron carbide, thermoplastic polyether ester, sesbania gum, benzotriazole and 4, 4-diaminodiphenyl amide, wherein the mass ratio of the polyacrylamide to the polyethylene wax to the boron carbide to the thermoplastic polyether ester to the sesbania gum to the benzotriazole to the 4, 4-diaminodiphenyl amide is 1.9:1.8:1:2.2:1.6:0.6: 0.7.
In a more preferred embodiment of the invention, the high-strength degradable temporary plugging ball for oil and gas wells is mainly prepared by reacting the following components: the adhesive comprises polyacrylamide, polyethylene wax, boron carbide, thermoplastic polyether ester, sesbania gum, benzotriazole and 4, 4-diaminodiphenyl amide, wherein the mass ratio of the polyacrylamide to the polyethylene wax to the boron carbide to the thermoplastic polyether ester to the sesbania gum to the benzotriazole to the 4, 4-diaminodiphenyl amide is 1.8:1.7:1:2.4:1.7:0.6: 0.8.
In the high-strength degradable temporary plugging ball for oil and gas wells, preferably, the thermoplastic polymer comprises one or more of thermoplastic polyether ester, polyvinyl alcohol and polymethyl methacrylate.
In the high-strength degradable temporary plugging ball for oil and gas wells provided by the invention, preferably, the thermoplastic polymer is thermoplastic polyether ester.
In the high-strength degradable temporary plugging ball for oil and gas wells, preferably, the thermoplastic polyether ester is prepared by synthesizing polyether ester elastomer and polycarbodiimide according to the mass ratio of 5-9: 1-4;
more preferably, the thermoplastic polyether ester is prepared by synthesizing polyether ester elastomer and polycarbodiimide according to the mass ratio of 7: 3. In a more preferred embodiment of the invention, the thermoplastic polyether ester is prepared by synthesizing a polyether ester elastomer and polycarbodiimide according to a mass ratio of 7:3 (a conventional method in the field), and the mechanical property, the insulating property and the high temperature resistance of the polyether ester elastomer material are further improved by the polycarbodiimide, so that the thermoplastic polyether ester with better indexes such as thermoplastic parameter and elastic deformation performance than those of a thermoplastic polyether ester raw material is obtained.
In the high-strength degradable temporary plugging ball for the oil and gas well, the polyacrylamide is an adhesive; the polyethylene wax is a dispersing agent; the boron carbide is a temperature-resistant material; the thermoplastic polymer (e.g., thermoplastic polyetherester) is an elastomer; the sesbania gum is a stabilizer; the benzotriazole is a light-proof agent; the 4, 4-diaminodiphenyl amide is a rigidizer.
In particular, the polyacrylamide is used to glue the remaining components; the polyethylene wax is used for bearing and mutually dissolving other components; the boron carbide is used for improving the heat resistance of the strength product; the sesbania gum is used for improving the structural stability of the product; the benzotriazole is used for resisting the effect of illumination; the 4, 4-diaminodiphenylamide is used for enhancing the rigidity of the product and optimizing the compression resistance of the product; the thermoplastic polyether ester (thermoplastic polyether ester) is used for forming a reliable thermoplastic and elastic deformation capability of a product.
In the high-strength degradable temporary plugging ball for oil and gas wells, raw material polyether ester elastomer and polycarbodiimide for preparing thermoplastic polyether ester are conventional substances in the field and can be obtained commercially.
In the high-strength degradable temporary plugging ball for the oil and gas well, preferably, the reaction is carried out for 3 to 7 hours in a 35 to 50MPa pressure container under the reaction condition of 140 ℃ and 250 ℃; more preferably for 5 hours.
In the high-strength degradable temporary plugging ball for an oil and gas well provided by the invention, preferably, the preparation of the temporary plugging ball for an oil and gas well further comprises the operation of heating the degradable material obtained by the reaction to a molten state, pouring the degradable material into a spherical mold, and obtaining the high-strength degradable temporary plugging ball for an oil and gas well with different sizes.
In the high-strength degradable oil and gas well temporary plugging ball provided by the invention, preferably, the diameter of the high-strength degradable oil and gas well temporary plugging ball is 5mm-20 mm.
In a preferred embodiment of the present invention, a person skilled in the art can reasonably set the diameter of the temporary plugging ball of the high-strength degradable oil and gas well according to the operation requirement, and specifically, the diameter of the temporary plugging ball of the high-strength degradable oil and gas well can be 5.5mm, 9.0mm, 11.0mm, 13.5mm, 15.0mm, and 18.0 mm.
The temporary plugging fracturing implementation principle of the high-strength degradable temporary plugging ball for the oil and gas well provided by the invention is as follows: the high-strength degradable oil and gas well temporary plugging ball follows the principle that fluid flows towards the direction with the minimum resistance, and flows into the well bottom along with fracturing fluid in the construction process to plug perforation holes of a low-pressure area formed by a pressed interval, so that subsequent fracturing fluid cannot enter the perforation holes of the pressed area, the fracturing fluid is forced to flow into a high-stress area which is not fractured in a steering manner, a complex crack network is formed by generation of new cracks, and after construction is completed, degradation is realized within the fracturing requirement time range, pollution is not caused to the stratum, and production is not influenced.
The high-strength degradable temporary plugging ball for the oil and gas well can plug irregular blastholes after being polished by a propping agent, improves the plugging efficiency and has high pressure bearing capacity; the plugging performance is good, and blastholes in various shapes can be plugged; the solubility is good, and the fracturing fluid can be completely dissolved in the fracturing fluid without residue; the operation and investment method is simple, and no burden is brought to operators and fracturing equipment.
The invention also provides a preparation method of the high-strength degradable oil and gas well temporary plugging ball, wherein the method comprises the following main components in a reaction kettle for reaction: the adhesive comprises polyacrylamide, polyethylene wax, boron carbide, a thermoplastic polymer, sesbania gum, benzotriazole and 4, 4-diaminodiphenylamide, wherein the mass ratio of the polyacrylamide to the polyethylene wax to the boron carbide to the thermoplastic polymer to the sesbania gum to the benzotriazole to the 4, 4-diaminodiphenylamide is 1-2:1-2:0.5-1:2-3:1-2:0.5-1: 0.5-1.
In the above preparation method, preferably, the method further comprises an operation of heating the degradable material obtained by the reaction to a molten state, pouring the material into a spherical mold, and thus obtaining the high-strength degradable temporary plugging ball for oil and gas wells with different sizes.
In the above preparation method, preferably, the reaction conditions in the reaction vessel are set as follows: the temperature is 140 ℃ and 250 ℃, the pressure is 35-50MPa, and the reaction is carried out for 3-7 hours; more preferably for 5 hours.
In a more preferred embodiment of the present invention, in the preparation process, the reaction temperature is 160 ℃, the reaction pressure is 38MPa, and the reaction time is 5 hours.
In a more preferred embodiment of the present invention, in the preparation process, the reaction temperature is 170 ℃, the reaction pressure is 35MPa, and the reaction time is 5 hours.
In a more preferred embodiment of the present invention, in the preparation process, the reaction temperature is 160 ℃, the reaction pressure is 40MPa, and the reaction time is 5 hours.
The invention also provides application of the high-strength degradable oil and gas well temporary plugging ball in oil and gas well temporary plugging treatment.
The invention also provides a treatment method for temporarily blocking the oil and gas well by applying the high-strength degradable oil and gas well temporary blocking ball, wherein the method comprises the following steps: will high strength degradable oil gas well temporary plugging ball is in advance arranged in the riser that links to each other with fracturing system fluid valve, opens the fluid valve before the fracturing or fracturing midway, and this high strength degradable oil gas well temporary plugging ball gets into high-pressure manifold, along with fracturing fluid injection pit shaft in, observes pressure variation under certain discharge capacity, when pressure has obvious change, then explains temporary plugging ball shutoff punchhole, can carry out fracturing construction on next step.
In the above treatment method, preferably, the length of the riser is 0.5 ± 0.1 m.
In the above processIn the method, preferably, the displacement is 6-18m3/min。
In the above processing method, a person skilled in the art can judge that the pressure has a significant change by routine, for example, in the embodiment of the present invention, when the pressure rise amplitude is not less than 2MPa, the pressure can be judged to have a significant change.
In the method for treating the temporary plugging of the oil and gas well by applying the high-strength degradable temporary plugging ball of the oil and gas well, the specific delivery mode refers to the self research and development technology of oriental treasure Lin scientific and technological development (Beijing) Limited company, namely the delivery operation of the high-strength degradable temporary plugging ball of the oil and gas well is implemented by the fracturing equipment, the fracturing method and the fracturing process (detailed in figure 7) which are applicable to the mixed temporary plugging volume fracturing method (CN106437662A) of the deep shale gas horizontal well, and the difference is that in the fracturing system provided by the invention, a vertical pipe with the length of 0.5m is respectively connected to the upper surface of the hydraulic valve 1 and the upper surface of the hydraulic valve 2 and is used for placing two groups of high-strength degradable temporary plugging balls of the oil and gas well.
In a specific embodiment of the invention, the treatment method of the temporary plugging of the oil and gas well by the high-strength degradable temporary plugging ball of the oil and gas well specifically comprises the following steps: respectively connecting a vertical pipe with the length of 0.5m to the upper surfaces of the hydraulic valve 1 and the hydraulic valve 2, respectively placing two groups of temporary plugging balls in the vertical pipe, putting a first group of temporary plugging balls in the vertical pipe connected with the hydraulic valve 1 before fracturing, and putting a second group of temporary plugging balls in the vertical pipe connected with the hydraulic valve 2 in the middle of fracturing;
before fracturing, the hydraulic valve 1 is started, a first group of temporary plugging balls in the vertical pipe enter a high-pressure manifold, and the discharge capacity is quickly increased to 6-18m3And/min, enabling the temporary plugging ball to enter a shaft along with the fracturing fluid, and stably discharging the oil to 6-18m3Min, when the pressure is obviously changed, the temporary plugging ball is used for plugging the hole, and the next fracturing construction can be carried out;
the amount of fracturing fluid is up to 1000-3When the discharge is reduced to 6-18m3And/min, starting the hydraulic valve 2, delivering a second group of temporary plugging balls, keeping the discharge capacity unchanged, observing pressure change, and when the pressure obviously changes, indicating that the temporary plugging balls block the holes, so that the next fracturing construction can be carried out.
In conclusion, the high-strength degradable temporary plugging ball for the oil and gas well provided by the invention has the following advantages: the high-strength degradable temporary plugging ball for the oil and gas well is good in dissolubility or degradation performance, free of selection on the environment of dissolved or degraded water quality, wide in applicable geographic environment and temperature environment range, good in bearing strength, elastic deformation capacity and sealing performance on blastholes, capable of forming good sealing plugging on blastholes of irregular sizes, high in plugging success rate, excellent in flexibility and reliability during operation, good in light adaptability and strong in resistance, and completely suitable for the fracturing technical requirements of temporary plugging steering for fracturing purposes in the domestic shale gas horizontal well fracturing market.
Drawings
FIG. 1 is a dissolution curve diagram of the high-strength degradable temporary plugging ball for oil and gas wells obtained in example 3 of the invention at 90 ℃.
FIG. 2 is a graph showing the dissolution profile of the high-strength degradable temporary plugging ball for oil and gas wells obtained in example 3 of the present invention at 130 ℃.
FIG. 3 is a graph showing the dissolution profile of the high-strength degradable temporary plugging ball for oil and gas wells obtained in example 3 of the present invention at 150 ℃.
FIG. 4 is a pressure-bearing curve diagram of a high-strength degradable temporary plugging ball for an oil and gas well, obtained in example 3 of the present invention, seated on a ball seat with a diameter of 9mm at 130 ℃.
FIG. 5 is a pressure-bearing curve diagram of the high-strength degradable temporary plugging ball for oil and gas wells obtained in example 3 of the present invention, which is seated on a ball seat with a diameter of 10mm at 130 ℃.
FIG. 6 is a pressure-bearing curve diagram of a temporary plugging ball of an oil and gas well obtained in comparative example 2 of the present invention, which is seated on a ball seat with a diameter of 9mm at 130 ℃.
FIG. 7 is a schematic diagram of the placement of a high-strength degradable temporary plugging ball for an oil and gas well in an application example of the invention.
FIG. 8 is a sand fracturing curve (2 nd construction) of the high strength degradable temporary plugging ball for oil and gas wells provided by the invention in an application example of the invention.
FIG. 9 is a sand fracturing curve (3 rd construction) of the high-strength degradable temporary plugging ball for oil and gas wells, which is provided by the invention, applied in an application example of the invention.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
Example 1
The embodiment provides a high-strength degradable temporary plugging ball for an oil and gas well, and the preparation method comprises the following steps:
the material proportion is as follows: the adhesive comprises polyacrylamide, polyethylene wax, boron carbide, thermoplastic polyether ester, sesbania gum, benzotriazole and 4, 4-diaminodiphenyl amide, wherein the mass ratio of the polyacrylamide to the polyethylene wax to the boron carbide to the thermoplastic polyether ester to the sesbania gum to the benzotriazole to the 4, 4-diaminodiphenyl amide is 2:1.8:1:2.3:1.8:0.6: 0.5.
Wherein the thermoplastic polyether ester is synthesized from a polyether ester elastomer and polycarbodiimide according to the mass ratio of 7: 3.
The components are put into a reaction kettle according to the proportion and then react for 5 hours under the condition of 160 ℃ and 38 MPa.
And heating the substance obtained by the reaction to a molten state, pouring the molten substance into a spherical mold, and obtaining the high-strength degradable temporary plugging ball with the diameter of 9.0mm, which is marked as temporary plugging ball A.
Example 2
The embodiment provides a high-strength degradable temporary plugging ball for an oil and gas well, and the preparation method comprises the following steps:
the material proportion is as follows: the adhesive comprises polyacrylamide, polyethylene wax, boron carbide, thermoplastic polyether ester, sesbania gum, benzotriazole and 4, 4-diaminodiphenyl amide, wherein the mass ratio of the polyacrylamide to the polyethylene wax to the boron carbide to the thermoplastic polyether ester to the sesbania gum to the benzotriazole to the 4, 4-diaminodiphenyl amide is 1.9:1.8:1:2.2:1.6:0.6: 0.7.
Wherein the thermoplastic polyether ester is synthesized from a polyether ester elastomer and polycarbodiimide according to the mass ratio of 7: 3.
The components are put into a reaction kettle according to the proportion and then react for 5 hours at the temperature of 170 ℃ and under the pressure of 35 MPa.
And heating the substance obtained by the reaction to a molten state, pouring the molten substance into a spherical mold, and obtaining the high-strength degradable temporary plugging ball with the diameter of 11.0mm, which is marked as temporary plugging ball B.
Example 3
The embodiment provides a high-strength degradable temporary plugging ball for an oil and gas well, and the preparation method comprises the following steps:
the material proportion is as follows: the adhesive comprises polyacrylamide, polyethylene wax, boron carbide, thermoplastic polyether ester, sesbania gum, benzotriazole and 4, 4-diaminodiphenyl amide, wherein the mass ratio of the polyacrylamide to the polyethylene wax to the boron carbide to the thermoplastic polyether ester to the sesbania gum to the benzotriazole to the 4, 4-diaminodiphenyl amide is 1.8:1.7:1:2.4:1.7:0.6: 0.8.
Wherein the thermoplastic polyether ester is synthesized from a polyether ester elastomer and polycarbodiimide according to the mass ratio of 7: 3.
The components are put into a reaction kettle according to the proportion and then react for 5 hours under the condition of 160 ℃ and the pressure of 40 MPa.
And heating the substance obtained by the reaction to a molten state, pouring the molten substance into a spherical mold, and obtaining the high-strength degradable temporary plugging ball with the diameter of 13.5mm, which is marked as temporary plugging ball C.
Comparative example 1
The embodiment provides a temporary plugging ball for an oil and gas well, and a preparation method of the temporary plugging ball comprises the following steps:
the material proportion is as follows: the adhesive comprises polyacrylamide, polyethylene wax, boron carbide, thermoplastic polyether ester, sesbania gum and 4, 4-diaminodiphenyl amide, wherein the mass ratio of the polyacrylamide to the polyethylene wax to the boron carbide to the thermoplastic polyether ester to the sesbania gum to the 4, 4-diaminodiphenyl amide is 1.8:1.7:1:2.4:1.7: 0.8.
Wherein the thermoplastic polyether ester is synthesized from a polyether ester elastomer and polycarbodiimide according to the mass ratio of 7: 3.
The components are put into a reaction kettle according to the proportion and then react for 5 hours at the temperature of 170 ℃ and under the pressure of 40 MPa.
And heating the substance obtained by the reaction to a molten state, pouring the molten substance into a spherical mold, and obtaining a high-strength degradable oil-gas well temporary plugging ball with the diameter of 13.5mm, which is marked as temporary plugging ball D.
Comparative example 2 this example provides an oil and gas well temporary plugging ball, the preparation method of which comprises the following steps:
the material proportion is as follows: the adhesive comprises polyacrylamide, polyethylene wax, boron carbide, thermoplastic polyether ester, sesbania gum and benzotriazole, wherein the mass ratio of the polyacrylamide to the polyethylene wax to the boron carbide to the thermoplastic polyether ester to the sesbania gum to the benzotriazole is 1.8:1.7:1:2.4:1.7: 0.6.
Wherein the thermoplastic polyether ester is synthesized from a polyether ester elastomer and polycarbodiimide according to the mass ratio of 7: 3.
The components are put into a reaction kettle according to the proportion and then react for 5 hours at the temperature of 170 ℃ and under the pressure of 40 MPa.
And heating the substance obtained by the reaction to a molten state, pouring the molten substance into a spherical mold, and obtaining the high-strength degradable temporary plugging ball with the diameter of 13.5mm, which is marked as temporary plugging ball E.
Test example 1
The temporary plugging ball C obtained in example 3 of the present invention was subjected to a dissolution test, wherein the test pressure is 20MPa, the test temperatures are 90 ℃, 130 ℃ and 150 ℃, and the dissolution curves of the temporary plugging ball C at 90 ℃, 130 ℃ and 150 ℃ are shown in fig. 1-3, respectively, as can be seen from fig. 1-3, the temporary plugging ball C can be completely dissolved at 90 ℃, 130 ℃ and 150 ℃, and the higher the temperature is, the faster the dissolution is. Generally, the temperature of the shale gas reservoir is between 90 ℃ and 130 ℃, so that the degradation time of the high-strength degradable oil and gas well temporary plugging ball (temporary plugging ball C) prepared in the embodiment 3 in the temperature interval is 3h to 12h, the initial dissolution rate is slow, and the requirement of on-site fracturing can be met.
Test example 2
And then, carrying out a pressure bearing performance test on the temporary plugging ball C obtained in the embodiment 3 of the invention, wherein the test temperature is 130 ℃, respectively seating the temporary plugging ball C on ball seats with the diameters of 9mm and 10mm, repeatedly pressurizing to about 70MPa for many times, observing the phenomenon, wherein the pressure bearing curve is shown in fig. 4-5, and the experimental result shows that the temporary plugging ball C of the high-strength degradable oil and gas well has deformation but does not have a crushing phenomenon in the test process, thereby proving that the temporary plugging ball C of the high-strength degradable oil and gas well obtained in the embodiment 3 of the invention has the capability of bearing 70 MPa.
Test example 3
The temporary plugging balls A-C obtained in examples 1-3 of the present invention were subjected to elastic deformation performance tests, and the test results are shown in Table 1 below, wherein under the test condition of a pressure of 70MPa, the average deformation rate of the following three test objects (temporary plugging balls A-C) was 11.81%, and the recovery rate was 93.11%.
TABLE 1
Test example 4 the temporary plugging ball C obtained in example 3 and the temporary plugging ball D obtained in comparative example 1 were exposed to strong sunlight for 8 hours, and then subjected to the elastic deformation performance test, respectively. As shown in table 2 below, when the pressure is 70MPa under the test conditions, it can be seen from table 2 that the deformation rate and recovery rate of the temporary plugging ball D are greatly reduced compared to those of the temporary plugging ball C, and the elastic deformability is weakened.
TABLE 2
Test example 5
And (3) testing the pressure bearing performance of the temporary plugging ball E obtained in the comparative example 2, wherein the test temperature is 130 ℃, the temporary plugging ball E is seated on a ball seat with the diameter of 9mm, the pressure is gradually increased, the phenomenon is observed, the pressure bearing curve is shown in figure 6, and the experimental result of figure 6 shows that when the pressure is 50MPa, the temporary plugging ball is cracked, so that the pressure bearing capacity of the temporary plugging ball E obtained in the comparative example 2 is lower than 50MPa, and the pressure bearing capacity of the temporary plugging ball E is far lower than that of the high-strength degradable oil and gas well temporary plugging ball provided by the invention.
Application example
Taking a certain shale gas horizontal well as an example, the length of a certain well section is 350m, the structure is constructed for 3 times, and the single scale is 3000m according to the liquid amount3The sand amount is 180-200 t; the discharge capacity is 10-12m3Min; the construction pressure is controlled to be less than or equal to 75MPa, the total number of theoretical holes is 240 holes, temporary plugging balls of 9.0mm +11.0mm +13.5mm are selected and respectively prepared in the embodiments 1-3 of the invention, and the concrete fracturing construction steps are as follows:
1, construction for the first time: before construction, the temporary plugging balls required by the construction are respectively arranged in a vertical pipe connected with the hydraulic valve 1, and the number of the temporary plugging balls is 94 temporary plugging balls with 9.0mm, 98 temporary plugging balls with 11.0mm and 48 temporary plugging balls with 13.5 mm. During construction, acid is replaced into the stratum by small discharge capacity, then the stratum is lifted to target discharge capacity for sand adding operation, and the construction liquid amount is 1480m3When the discharge volume is reduced to 8.2m3And/min, opening the hydraulic valve 1, putting in a temporary plugging ball in the vertical pipe, plugging the fractured perforation by the temporary plugging ball, gradually increasing to the target discharge capacity to perform sand adding operation when the construction pressure is obviously changed, and finishing the construction.
And 2, construction for the second time: before construction, two groups of temporary plugging balls required by the construction are respectively arranged in a vertical pipe connected with the hydraulic valve 1 and the hydraulic valve 2, the number of the first group of temporary plugging balls in the vertical pipe 1 is 156 temporary plugging balls with 9.0mm, 122 temporary plugging balls with 11.0mm and 48 temporary plugging balls with 13.5mm, and the number of the second group of temporary plugging balls in the vertical pipe 2 is 125 temporary plugging balls with 9.0mm, 115 temporary plugging balls with 11.0mm and 14 temporary plugging balls with 13.5 mm.
Before construction, the hydraulic valve 1 is opened, a first group of temporary plugging balls are put in, and the discharge capacity is quickly increased to 15.0m3Min, continuing to add sand when the construction pressure is obviously changed after the fractured perforation is blocked by the temporary blocking ball; the construction liquid amount is 998m3And (3) keeping the discharge capacity unchanged, opening the hydraulic valve 2, putting a second group of temporary plugging balls, and adding sand operation when the temporary plugging balls plug the fractured perforation holes, wherein the construction pressure is obviously changed, so that the construction is completed. The sand fracturing curve is shown in fig. 8, the construction pressure curve corresponds to the left ordinate in the graph, the unit of the construction pressure is MPa, the construction displacement curve corresponds to the first-row ordinate on the right side in the graph, and the unit of the construction displacement is m3Min, sand ratioOr the sand adding concentration corresponds to the second vertical coordinate on the right side of the graph, and the sand ratio unit is%. As can be seen from the graph 8, the in-place pressure of the first temporary plugging ball is increased from 48.2MPa to 51.5MPa and is increased by 3.3MPa, and the in-place pressure of the second temporary plugging ball is increased from 52.7MPa to 71.3MPa and is increased by 18.6MPa, so that the high-strength degradable temporary plugging ball for the oil and gas well provided by the invention has good plugging performance.
And (3) construction: before construction, two groups of temporary plugging balls required by the construction are respectively arranged in a vertical pipe connected with the hydraulic valve 1 and the hydraulic valve 2, the number of the first group of temporary plugging balls in the vertical pipe 1 is 156 temporary plugging balls with 9.0mm, 122 temporary plugging balls with 11.0mm and 48 temporary plugging balls with 13.5mm, and the number of the second group of temporary plugging balls in the vertical pipe 2 is 125 temporary plugging balls with 9.0mm, 115 temporary plugging balls with 11.0mm and 14 temporary plugging balls with 13.5 mm.
Before construction, the hydraulic valve 1 is opened, a first group of temporary plugging balls are put in, and the discharge capacity is quickly increased to 16.0m3Min, continuing to add sand when the construction pressure is obviously changed after the fractured perforation is blocked by the temporary blocking ball; the construction liquid amount is 924m3And (3) keeping the discharge capacity unchanged, opening the hydraulic valve 2, putting a second group of temporary plugging balls, and adding sand operation when the temporary plugging balls plug the fractured perforation holes, wherein the construction pressure is obviously changed, so that the construction is completed. The sand fracturing curve is shown in fig. 9, the construction pressure curve corresponds to the left ordinate in the graph, the unit of the construction pressure is MPa, the construction displacement curve corresponds to the first row ordinate on the right side in the graph, and the unit of the construction displacement is m3And/min, the sand ratio or the sand adding concentration corresponds to the second row ordinate on the right side in the graph, and the sand ratio unit is%. As can be seen from FIG. 9, the in-place pressure of the first temporary plugging ball is increased from 50.4MPa to 56.3MPa and is increased by 5.9MPa, and the in-place pressure of the second temporary plugging ball is increased from 51.9MPa to 71.5MPa and is increased by 19.6MPa, so that the high-strength degradable temporary plugging ball for the oil and gas well provided by the invention has good plugging performance.
Claims (16)
1. The utility model provides a high strength degradable oil gas well temporary plugging ball which characterized in that, high strength degradable oil gas well temporary plugging ball is mainly prepared through the reaction by following composition: the adhesive comprises polyacrylamide, polyethylene wax, boron carbide, a thermoplastic polymer, sesbania gum, benzotriazole and 4, 4-diaminodiphenylamide, wherein the mass ratio of the polyacrylamide to the polyethylene wax to the boron carbide to the thermoplastic polymer to the sesbania gum to the benzotriazole to the 4, 4-diaminodiphenylamide is 1-2:1-2:0.5-1:2-3:1-2:0.5-1: 0.5-1.
2. The high strength degradable oil and gas well temporary plugging ball according to claim 1, wherein said thermoplastic polymer comprises one or a combination of thermoplastic polyether ester, polyvinyl alcohol and polymethyl methacrylate.
3. The high strength degradable oil and gas well temporary plugging ball according to claim 1, wherein said thermoplastic polymer is a thermoplastic polyetherester.
4. The high-strength degradable oil and gas well temporary plugging ball according to claim 3, wherein said thermoplastic polyether ester is prepared by synthesizing polyether ester elastomer and polycarbodiimide according to the mass ratio of 5-9: 1-4.
5. The high-strength degradable oil and gas well temporary plugging ball according to claim 4, wherein said thermoplastic polyether ester is prepared by synthesizing polyether ester elastomer and polycarbodiimide according to a mass ratio of 7: 3.
6. The high-strength degradable oil and gas well temporary plugging ball as claimed in claim 1, wherein the reaction condition is that the reaction is carried out in a 35-50MPa pressure vessel for 3-7 hours at the temperature of 140-250 ℃.
7. The high-strength degradable oil and gas well temporary plugging ball as claimed in claim 6, wherein the reaction condition is that the reaction is carried out for 5 hours in a 35-50MPa pressure vessel at the temperature of 140 ℃ and 250 ℃.
8. The high-strength degradable temporary plugging ball for oil and gas wells as claimed in claim 1, wherein the preparation of the temporary plugging ball for oil and gas wells further comprises the operation of heating the degradable material obtained by the reaction to a molten state, pouring the material into a spherical mold, and obtaining the high-strength degradable temporary plugging ball for oil and gas wells with different sizes.
9. The high-strength degradable oil and gas well temporary plugging ball according to any one of claims 1 to 8, wherein the diameter of said high-strength degradable oil and gas well temporary plugging ball is 5mm to 20 mm.
10. The method for preparing the high-strength degradable oil-gas well temporary plugging ball of any one of claims 1 to 9, which comprises the following main components put into a reaction kettle for reaction: the adhesive comprises polyacrylamide, polyethylene wax, boron carbide, a thermoplastic polymer, sesbania gum, benzotriazole and 4, 4-diaminodiphenylamide, wherein the mass ratio of the polyacrylamide to the polyethylene wax to the boron carbide to the thermoplastic polymer to the sesbania gum to the benzotriazole to the 4, 4-diaminodiphenylamide is 1-2:1-2:0.5-1:2-3:1-2:0.5-1: 0.5-1;
and heating the degradable material obtained by the reaction to a molten state, and pouring the material into a spherical mold to obtain the high-strength degradable temporary plugging ball of the oil-gas well with different sizes.
11. The preparation method according to claim 10, wherein the reaction conditions in the reaction kettle are set as follows: the temperature is 140 ℃ and 250 ℃, the pressure is 35-50MPa, and the reaction lasts for 3-7 hours.
12. The preparation method according to claim 11, wherein the reaction conditions in the reaction kettle are set as follows: the temperature is 140 ℃ and 250 ℃, the pressure is 35-50MPa, and the reaction is carried out for 5 hours.
13. Use of the high strength degradable oil and gas well temporary plugging ball of any one of claims 1-9 in an oil and gas well temporary plugging process.
14. The method for treating temporary plugging of an oil and gas well by using the high-strength degradable temporary plugging ball for the oil and gas well as any one of claims 1 to 9, wherein the method comprises the following steps: will high strength degradable oil gas well temporary plugging ball is in advance arranged in the riser that links to each other with fracturing system fluid valve, opens the fluid valve before the fracturing or fracturing midway, and this high strength degradable oil gas well temporary plugging ball gets into high-pressure manifold, along with fracturing fluid injection pit shaft in, observes pressure variation under certain discharge capacity, when pressure has obvious change, then explains temporary plugging ball shutoff punchhole, can carry out fracturing construction on next step.
15. The method of claim 14, wherein the length of the riser is 0.5 ± 0.1 m.
16. A method according to claim 14 or 15, wherein the displacement is 6-18m3/min。
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| CN114592840B (en) * | 2020-12-04 | 2023-10-27 | 中国石油天然气股份有限公司 | Temporary plugging fracturing method and application thereof |
| CN113637466B (en) * | 2021-08-27 | 2022-09-23 | 洲际海峡能源科技有限公司 | High-temperature-resistant degradable rope knot type temporary plugging agent and preparation method and application thereof |
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