CN115109572B - High-strength deformable degradable knot temporary plugging ball and preparation method and application thereof - Google Patents
High-strength deformable degradable knot temporary plugging ball and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a high-strength deformable degradable rope knot temporary plugging ball and a preparation method and application thereof, relating to the technical field of petroleum fracturing, and the technical scheme is as follows: the knot temporary blocking ball consists of an elastic ball and a composite fiber rope which radially penetrates through the elastic ball; the elastic ball consists of the following components in percentage by mass: 25-65% of resin, 3-15% of glycerol, 25-45% of natural fibers, 5-15% of calcium chloride, 0.1-1% of foaming agent, 0.01-0.05% of plasticizer and 0.02-0.1% of antioxidant; the composite fiber rope consists of the following components in percentage by mass: 20% -90% of PVA fiber, 10% -70% of PLA fiber and 0% -10% of PET fiber. The temporary rope knot blocking ball provided by the technical scheme has the advantages of high stability, strong deformability and high bearing strength, and can completely block blastholes with irregular shapes and sizes.
Description
Technical Field
The invention relates to the technical field of petroleum fracturing, in particular to a high-strength deformable degradable temporary plugging ball for knots, and a preparation method and application thereof.
Background
With the rapid development of oil and gas exploration industry, a large number of low-permeability or ultra-low-permeability unconventional oil and gas reservoirs are increasingly focused by petroleum workers, and the exploitation of the oil and gas reservoirs needs to undergo reservoir yield increase reconstruction to realize economic and effective development. Among reservoir reformation techniques, hydraulic fracturing is one of the most important measures to improve the production efficiency of oil and gas fields. However, due to various reasons such as large span of coal bed gas, dense gas and shale gas reservoir areas, various geological structures and complexity, strong non-average property of partial reservoirs, large formation opening pressure difference and the like, various difficulties are encountered in the hydraulic fracturing construction process, particularly when the fracturing transformation process of multiple clusters of long horizontal well sections of the dense reservoir and the shale reservoir is carried out, the effective opening of the whole clusters is difficult to realize, and partial perforation clusters are not transformed or are not fully transformed. In order to solve the problem, fiber and particle temporary plugging agents or temporary plugging ball plugging borehole technologies are proposed and applied on site, but certain disadvantages are exposed, such as that a fiber particle temporary plugging system is easy to form a pump plug or accumulate in a pipeline in the process of carrying a liquid pump, and temporary plugging balls cannot completely plug the boreholes with irregular shapes and sizes, so that effective opening of all perforation clusters cannot be ensured, and a fracturing effect is realized.
Problems such as layering of a vertical well, sectioning of a horizontal well, temporary plugging and repeated fracturing of an old well, plugging in a drilling process, leakage points in a long-term exploitation process of oil and casing pipes and the like are common temporary plugging technical requirements in an oilfield development process, and particularly, the temporary plugging technology is widely applied when plugging perforation holes at the present stage to realize layering or sectioning fracturing. The temporary plugging ball is thrown, the perforation holes are flushed and polished by fracturing sand, so that the perforation holes are expanded and deformed, the temporary plugging ball is difficult to effectively plug irregular perforation holes, meanwhile, the temporary plugging ball is easy to fall off due to water flow flushing or pressure release, segmentation or delamination failure is caused, the implementation of layering or staged fracturing technology is difficult to ensure, and the post-pressing effect is seriously influenced. Aiming at malignant fluid loss such as cracks, karst cave and the like in the drilling process, the drilling fluid is caused to rapidly enter the stratum, the reservoir is greatly damaged, meanwhile, the pressure in the shaft is obviously changed due to the increase of the fluid loss, and the construction risk is easily caused. The conventional method adopts chemical gel and/or solid plugging materials, has low plugging success rate, and has short effective time after general injection. In the other field, in the long-term development process of the oil field, oil pipes and casing pipes are corroded, extrusion deformation is caused by pressure in the oil storage layer, damage to the oil pipes and casing pipes occurs, production inefficiency or production stoppage is caused, loss of well control fluid is caused by leakage points in the later well repairing process, and the problems of large injection amount, low compressive strength and poor plugging effect are solved by conventionally adopting liquid chemical plugging agents.
The application number 202110146581.X discloses a high-strength degradable flexible rope knot blasthole temporary plugging agent, a preparation method and application thereof, wherein the high-strength degradable flexible rope knot temporary plugging agent is mainly prepared by processing the following polymer fiber components in proportion through the processes of doubling, twisting, rope formation, shearing, rope knot forming, coating wrapping and the like. The temporary blocking rope knot products are all formed by weaving and processing pure fibers, the deformability of the temporary blocking rope is influenced by the fiber weaving process, the weaving structure and the size of the temporary blocking rope knot, and the production and processing and the product quality stability are not high; the deformation degree is limited, and the bearing strength is low.
The application number 202110523281.9 discloses a temporary plug of a fully-degradable high-strength rope knot, which is prepared by sequentially performing the steps of drying, melting, spinning, drying, braiding and cutting after polymer A, plasticizer and sodium dodecyl sulfate are blended. The temporary plugging is formed by processing pure fibers, has the advantage of complete degradation, but has low strength of knots, small deformation and poor plugging effect on irregular holes.
Application number 202110315878.4 discloses an environment-friendly biological knot which adopts a knot type design and is used for staged fracturing to replace bridge plugs, and a use method thereof. The diameter of the environment-friendly biological knot can be prepared according to the size of a plugging eyelet. The bridge plug construction risk is reduced, the reservoir is uniformly fractured, the sleeve variable section can be subjected to staged fracturing, the sleeve variable well cannot be lost, the sleeve variable section can be subjected to staged fracturing according to the design, and the influence on the yield of the well caused by sleeve deformation is reduced. Meanwhile, the defects of the existing temporary plugging balls and temporary plugging agents in construction are overcome.
Application number 202011579941.7 discloses a method for temporary plugging of large-scale downhole fracturing perforations, the temporary plug being in the form of a knot in the middle and having a plurality of filaments separated at both ends. According to the invention, a composite bridge plug for pumping perforation is not used any more, and a plurality of perforation sections are combined into one section, so that the cable down-hole frequency is reduced; the use of temporary plugs ensures that all perforation clusters are uniformly fractured throughout the length of the perforation segment.
The application number 202110772158.0 discloses a temporary knot blocking ball for staged fracturing of oil and gas fields, the temporary knot blocking ball body is a flexible temporary knot blocking ball, the temporary knot blocking ball body can deform into irregular perforation holes under the action of pressure difference, and the problem that the conventional temporary ball blocking ball has low setting efficiency on the irregular perforation holes is solved.
The application number 202011167276.0 discloses a fully degradable temporary plug for fracturing an oil and gas well and a preparation method thereof, and the temporary plug is prepared by adopting a degradable material as a raw material and adopting a melting-spinning-braiding-cutting-drying process.
In summary, the prior art has the following drawbacks: (1) The existing temporary plugging rope knot products are all formed by weaving and processing pure fibers, the deformability of the temporary plugging rope is influenced by the fiber weaving process, the weaving structure and the size of the temporary plugging rope knot, and the production and processing and the product quality stability are not high; the deformation degree is limited, and the bearing strength is low;
(2) When the existing temporary plugging knots are put in, a temporary plugging knot protection shell needs to be added so as to facilitate the migration of the temporary plugging knots, and the production, processing and construction application processes are relatively complex;
(3) The existing temporary blocking ball has high strength, small deformability and low setting efficiency for irregular blastholes.
Disclosure of Invention
The invention aims to provide a high-strength deformable degradable rope knot temporary plugging ball, and a preparation method and application thereof, and solves the problems that the existing temporary plugging product is low in stability, limited in deformation degree, low in bearing strength and incapable of completely plugging blastholes with irregular shapes and sizes.
The technical aim of the invention is realized by the following technical scheme: a high-strength deformable degradable knot temporary plugging ball consists of an elastic ball and a composite fiber rope penetrating the elastic ball in the radial direction.
The principle of the scheme is as follows: the deformable performance of the elastic ball is complementary with the reinforcing performance of the composite fiber rope, meanwhile, the composite fiber rope has a secondary plugging effect on multiple irregular holes, and the diameter of the temporary plugging ball of the rope knot is adjustable according to the shape and the size of the irregular holes plugged according to the requirement, so that the problem of low setting efficiency of the conventional rigid temporary plugging ball on the irregular holes is solved.
Further, the elastic ball consists of the following components in percentage by mass: 25-65% of resin, 3-15% of glycerol, 25-45% of natural fibers, 5-15% of calcium chloride, 0.1-1% of foaming agent, 0.01-0.05% of plasticizer and 0.02-0.1% of antioxidant. The elastic ball prepared by adopting the formula solves the problems that the deformation amount of the knot of the pure fiber is small, the knot strength is unstable in the processing process, the throwing of the pure knot fiber is difficult, and the spherical shell is required to wrap, so that the plugging effect and the pressure-bearing performance of the temporary plugging ball of the knot are improved.
Further, the composite fiber rope consists of the following components in percentage by mass: 20% -90% of PVA fiber, 10% -70% of PLA fiber and 0% -10% of PET fiber.
Further, the resin is one or more of polylactic acid, polyvinyl alcohol, polyethylene terephthalate and polyhydroxyalkanoate; the natural fiber is bamboo fiber, lignin fiber or straw fiber. The strength of the elastic ball is improved due to the addition of the natural fibers.
Further, the foaming agent is NaHCO 3 、KaHCO 3 One or more of them. Due to the addition of the foaming agent, the density of the temporary plugging balls of the knots can be regulated and controlled; the plasticizer is one or more of glycerol, stearic acid and polyethylene glycol-400. Due to the addition of the plasticizer and the antioxidant, the flexibility and the processing performance of the elastic ball are enhanced; the antioxidant is one or more of antioxidant 1010 and antioxidant 168. Antioxidants can retard or inhibit the occurrence of oxidative processes in the natural state.
The preparation method of the high-strength deformable degradable knot temporary plugging ball comprises the following steps of:
(1) Preparing elastic balls: uniformly mixing resin, glycerol, natural fiber, calcium chloride, foaming agent, plasticizer and antioxidant; injection molding to obtain elastic balls with different densities, different diameters, controllable dissolution speed and radial perforation diameters of 5-12 mm;
(2) Preparing a composite fiber rope: mixing PVA fiber, PLA fiber and PET fiber, twisting and braiding to obtain a composite fiber rope with the diameter of 5-12 mm;
(3) And (3) assembling: and (3) penetrating the composite fiber rope through the elastic ball, and adjusting the lengths of the composite fibers at the two ends of the elastic ball to be 40-100mm according to actual needs to obtain the temporary plugging ball with the knots.
Further, the composite fiber rope is of a twist structure. Because the composite fibers are woven into the twist structure, the tightness among the composite fibers is improved, so that the strength of the composite fibers is improved, and the plugging effect of the temporary plugging ball for the reinforced knots on irregular holes is further achieved.
An application of a high-strength deformable degradable knot temporary plugging ball comprises the following steps: step 1, carrying out fracturing construction after horizontal section perforation; step 2, pumping a temporary plugging ball of a knot into a well, plugging the knot into a pressed perforation, and transferring fracturing fluid and propping agent to an unpressed perforation to enable all perforation to achieve equal cracking; and 3, carrying out subsequent construction after the temporary plugging knots are dissolved.
Further, the knotted temporary plugging ball is suitable for reservoirs at 50-130 ℃. The temporary rope knot blocking ball has no choice for degrading water quality in the temperature range of 50-130 ℃ reservoir, and can be completely degraded into CO 2 And H 2 Small molecules such as O and the like have little pollution to the environment, and the geological damage of the reservoir is small.
In summary, the invention has the following beneficial effects: (1) Combining a dissolvable high-elasticity deformed thermoplastic elastic ball with a dissolvable high-strength degradable composite fiber rope; (2) The rope knot temporary plugging ball with high elastic deformation can effectively plug irregular blastholes, and the setting efficiency of the rope knot temporary plugging ball on the blastholes is obviously better than that of the rigid temporary plugging ball through field application comparison; (3) The reinforcing effect and secondary plugging of the high-strength degradable composite fiber rope improve the pressure-bearing strength of the temporary plugging ball of the knot, the deformability of the temporary plugging ball of the knot is superior to that of the temporary plugging ball of the pure fiber, and compared with the temporary plugging ball of the knot by field application, the temporary plugging ball of the knot has higher pressure-bearing strength than the temporary plugging ball of the pure fiber; (4) The temporary plugging balls of the knots can be transported and effectively plugged without increasing spherical shell protection during throwing through density adjustment, and the production, processing and construction application processes are relatively simple; (5) The knot temporary blocking ball is completely dissolved, so that the damage to stratum and environment is reduced.
Drawings
FIG. 1 is a pictorial view of a hitch pause ball of the present invention;
Detailed Description
The present invention will be described in further detail with reference to fig. 1.
Example 1:
a high-strength deformable degradable knotted temporary plugging ball is prepared by the following method:
taking 25.00mm knot temporary plugging balls suitable for 50-70 ℃ as an example,
(1) Preparing a spring ball: polylactic acid resin particlesGranules, polyvinyl alcohol resin granules, glycerin, bamboo fiber, calcium chloride and NaHCO 3 The glycerol and antioxidant 1010 comprises the following components in parts by mass: 45.00:4.00:25.00:15.00:0.80:0.10:0.10, uniformly mixing; then is processed into the density of 1.28g/cm by extrusion injection molding 3 A spring ball with a diameter of 25.00mm and a hollow diameter of 10mm.
(2) Preparing a composite fiber rope: PVA fiber and PLA fiber are selected according to the mass ratio of 9:1, twisting and braiding to form a composite fiber rope with the diameter of 12 mm; the molecular weight of PVA fiber is 10 ten thousand-40 ten thousand, and the molecular weight of PLA fiber is 8 ten thousand-30 ten thousand.
(3) And (3) assembling: the composite fiber rope penetrates through the elastic ball, and the length of the composite fiber rope is 100mm.
Example 2
A high-strength deformable degradable knotted temporary plugging ball is prepared by the following method:
taking 25.00mm knot temporary plugging balls suitable for 80-100 ℃ as an example,
(1) Preparing a spring ball: mixing polylactic acid resin particles, polyvinyl alcohol resin particles, glycerol, bamboo fiber, calcium chloride and KaHCO 3 Stearic acid and antioxidant 168 with the mass portion of 18.00:35.00:4.00:35.00:7.00:0.80:0.10:0.10, uniformly mixing; extrusion injection molding to a density of 1.23g/cm 3 The diameter is 25.00mm, and the hollow diameter of the elastic sphere is 10mm.
(2) Preparing a composite fiber rope: PVA fiber, PLA fiber and PET fiber are selected according to the mass ratio of 5:4:1, twisting and braiding to obtain a high-strength degradable composite fiber rope with the diameter of 12 mm; the molecular weight of PVA fiber is 10-40 ten thousand, the molecular weight of PLA fiber is 8-30 ten thousand, and the molecular weight of PET fiber is 1.0-3.0 ten thousand.
(3) And (3) assembling: the composite fiber rope penetrates through the elastic ball, and the length of the composite fiber rope is 100mm.
Example 3
A high-strength deformable degradable knotted temporary plugging ball is prepared by the following method:
taking 25.00mm knot temporary plugging balls suitable for 110-130 ℃ as an example,
(1) PreparationSpring ball: mixing polylactic acid resin particles, polyvinyl alcohol resin particles, glycerol, bamboo fiber, calcium chloride and KaHCO 3 Polyethylene glycol-400 and antioxidant 168 in the mass portion of 30.00:20.00:4.00:40.00:5.00:0.80:0.10:0.10, uniformly mixing; extrusion injection molding to a density of 1.20g/cm 3 The diameter is 25.00mm, and the hollow diameter of the elastic sphere is 10mm.
(2) Preparing a composite fiber rope: PVA fiber, PLA fiber and PET fiber are selected according to the mass ratio of 2:6:2, twisting and braiding to obtain a high-strength degradable composite fiber rope with the diameter of 12 mm; the molecular weight of PVA fiber is 10-40 ten thousand, the molecular weight of PLA fiber is 8-30 ten thousand, and the molecular weight of PET fiber is 1.0-3.0 ten thousand.
(3) And (3) assembling: the composite fiber rope penetrates through the elastic ball, and the length of the composite fiber rope is 100mm.
Comparative example 1
Temporary blocking ball: a commercially available temporary plug ball was selected from Chengdu Louis technologies, inc., model LP-ZDB.
Comparative example 2
Pure fiber knots: commercially available pure fiber knots were selected from Chengdu Louis technologies, inc., model LP-ZDK.
The results of the dissolution (degradation) performance test of the temporary plugging balls with knots obtained in examples 1 to 3 at different temperatures are shown in table 1.
Table 1 comparative dissolution test of examples 1 to 3
Comparison is carried out by applying the example 1, the comparative example 1 and the comparative example 2 to the 6 th section temporary plugging construction of a certain compact gas horizontal well:
the temperature of a reservoir of a certain well is 70-80 ℃, 7 clusters of 40 holes are respectively designed in sections 6, 7 and 8, 15 temporary plugging balls, pure fiber knots and knot temporary plugging balls with the temperature of 20-25 mm and 60 ℃ are respectively designed and put in, and the initial pressure, the in-place pressure and the pressure fluctuation range are shown in Table 2.
The application method specifically comprises the following steps: after the well is closed and depressurized, the temporary plugging ball of the rope knot is thrown into the bypass pipe,or put into the injection head from the gate of the third well head, then shut the well to open the back pressure, after opening the valve of the well head, start the pump truck, the pumping capacity is up to 1m 3 After/min, after the temporary plugging agents with different particle sizes are put into a sand mixing vehicle, the discharge rate is quickly raised to 6m 3 And (5) pumping the temporary plugging ball and the temporary plugging agent together to a temporary plugging layer section to realize the plugging of correlation Kong Kongyan and the seam.
Table 2 example 1 comparative pressure bearing properties of temporary plugging material
| Temporary plugging material | Dimensional specification/mm | Quantity/particle | Initial pressure/MPa | In-situ pressure/MPa | Pressure rise/MPa |
| Comparative example 1 | 25 | 15 | 42.5 | 47.0 | 4.5 |
| Comparative example 2 | 20～22 | 15 | 46.3 | 49.4 | 3.1 |
| Example 1 | 25 | 15 | 45.2 | 51.6 | 6.4 |
Example 2, comparative example 1 and comparative example 2 were applied to a certain tight gas horizontal well 8 th stage temporary plugging construction: the temperature of a reservoir of a certain well is 100-110 ℃, 7 clusters of 40 holes are respectively designed in 8 th, 9 th and 10 th sections, 18 temporary plugging balls, pure fiber knots and knots of the temporary plugging balls which are 20-25 mm and 90 ℃ are respectively designed and put in, and the initial pressure, the in-place pressure and the pressure fluctuation range are shown in a table 3.
The application method specifically comprises the following steps: after closing the well and releasing pressure, throwing the temporary rope knot blocking ball from the bypass pipe or throwing the temporary rope knot blocking ball from the gate of the third well mouth to the injection head, closing the well and opening the back pressure, starting the pump truck after opening the well mouth valve, and lifting the discharge capacity to 1m 3 After/min, after the temporary plugging agents with different particle sizes are put into a sand mixing vehicle, the discharge rate is quickly raised to 6m 3 And (5) pumping the temporary plugging ball and the temporary plugging agent together to a temporary plugging layer section to realize the plugging of correlation Kong Kongyan and the seam.
TABLE 3 comparison of pressure bearing Properties of temporary plugging Material of example 2
| Temporary plugging material | Dimensional specification/mm | Quantity of/granule | Initial pressure/MPa | In-situ pressure/MPa | Pressure rise/MPa |
| Comparative example 1 | 25 | 18 | 46.6 | 52.3 | 5.7 |
| Comparative example 2 | 20～22 | 18 | 49.5 | 54.4 | 4.9 |
| Example 2 | 25 | 18 | 44.2 | 52.5 | 8.3 |
Example 3, comparative example 1 and comparative example 2 were applied in a 6 th stage temporary plugging construction of a well: the temperature of a reservoir of a certain well is 140-150 ℃, 7 clusters of 40 holes are respectively designed in the 5 th, 6 th and 7 th sections, 15 temporary plugging balls, pure fiber knots and knots of the temporary plugging balls which are 20-25 mm and 120 ℃ are respectively designed and put in, and the initial pressure, the in-place pressure and the pressure fluctuation range are shown in a table 4.
The application method specifically comprises the following steps: after the well is closed and depressurized, a temporary rope knot blocking ball is put into a bypass pipe or put into an injection head from a gate of the third well mouth, then the well is closed to open back pressure, and after the well mouth valve is opened, a pump truck is startedLifting capacity to 1m 3 After/min, after the temporary plugging agents with different particle sizes are put into a sand mixing vehicle, the discharge rate is quickly raised to 6m 3 And (5) pumping the temporary plugging ball and the temporary plugging agent together to a temporary plugging layer section to realize the plugging of correlation Kong Kongyan and the seam.
TABLE 4 comparison of pressure bearing Properties of temporary plugging Material of example 3
| Temporary plugging material | Dimensional specification/mm | Quantity/particle | Initial pressure/MPa | In-situ pressure/MPa | Pressure rise/MPa |
| Comparative example 1 | 25 | 18 | 47.0 | 50.2 | 3.2 |
| Comparative example 2 | 20～22 | 18 | 48.6 | 54.2 | 3.6 |
| Example 3 | 25 | 18 | 52.1 | 57.8 | 5.7 |
Pumping bridge plugs after the 5 th stage of fracturing of a shale gas sleeve variable well is finished, enabling the bridge plugs to be incapable of pumping due to sleeve variable influence at the 7 th stage, and determining all perforation of the 6 th stage and the 7 th stage on site, wherein the two stages of perforation are modified according to the following specific details: the temperature of the reservoir layer of the well is 140-150 ℃, and the 6 clusters of 42 holes are reformed in the 5 th stage in the earlier stage. The 6 th shot 4 cluster 48 holes, the 7 th shot 4 cluster 48 holes. First construction of design sleeve variable section, displacement is 2m 3 42 knots of 25mm and 120 ℃ temporary plugging balls are put in per minute, 4m 3 After the displacement per minute is sent in place, the construction pressure is increased from 42.1MPa to 48.8MPa, and the pressure is increased by 6.7MPa, which indicates that the effective plugging of the early-stage reconstruction well section is realized after the temporary plugging ball of the rope knot is seated. Designing the second construction of the sleeve variable section, wherein the displacement is 2m 3 48 knots of 25mm and temporary plugging balls at 120 ℃ are put in per minute, 4m 3 After the displacement per minute is sent in place, the construction pressure is increased from 44.3MPa to 50.2MPa, and the pressure is increased by 5.9MPa, which indicates that the effective plugging of the early-stage reconstruction well section is realized after the temporary plugging ball of the rope knot is seated.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Claims (8)
1. The deformable degradable knot temporary plugging ball is characterized by comprising an elastic ball and a composite fiber rope which radially penetrates through the elastic ball; the elastic ball consists of the following components in percentage by mass: 25-65% of resin, 3-15% of glycerol, 25-45% of natural fibers, 5-15% of calcium chloride, 0.1-1% of foaming agent, 0.01-0.05% of plasticizer and 0.02-0.1% of antioxidant.
2. A deformable degradable tie temporary plugging ball according to claim 1, wherein said composite fiber rope is composed of the following components in mass ratio: 20% -90% of PVA fiber, 10% -70% of PLA fiber and 0% -10% of PET fiber.
3. The deformable and degradable tie temporary plugging ball according to claim 2, wherein said resin is one or more of polylactic acid, polyvinyl alcohol, polyethylene terephthalate, polyhydroxyalkanoate; the natural fiber is one or more of bamboo fiber, lignin fiber or straw fiber.
4. A deformable degradable tie temporary plugging ball according to claim 2 wherein said foaming agent is NaHCO 3 、KHCO 3 One or more of the following; the plasticizer is one or more of glycerol, stearic acid and polyethylene glycol-400; the antioxidant is one or more of antioxidant 1010 and antioxidant 168.
5. The method for preparing the deformable degradable knot temporary plugging ball according to any one of claims 1 to 4, wherein the knot temporary plugging ball is prepared by the following method:
(1) Preparing elastic balls: uniformly mixing resin, glycerol, natural fiber, calcium chloride, foaming agent, plasticizer and antioxidant; injection molding to obtain elastic balls with different densities, different diameters, controllable dissolution speed and radial perforation diameters of 5-12 mm;
(2) Preparing a composite fiber rope: mixing PVA fiber, PLA fiber and PET fiber, twisting and braiding to obtain a composite fiber rope with the diameter of 5-12 mm;
(3) And (3) assembling: and (3) penetrating the composite fiber rope through the elastic ball, and adjusting the lengths of the composite fibers at the two ends of the elastic ball to be 40-100mm according to actual needs to obtain the temporary plugging ball with the knots.
6. The method for preparing a deformable and degradable tie temporary plugging ball according to claim 5, wherein said composite fiber rope is of a twist structure.
7. Use of a deformable degradable tie temporary plugging ball according to any one of claims 1-4, comprising the steps of:
step 1, carrying out fracturing construction after horizontal section perforation;
step 2, pumping a temporary plugging ball of a knot into a well, plugging the knot into a pressed perforation, and transferring fracturing fluid and propping agent to an unpressed perforation to enable all perforation to achieve equal cracking;
and 3, carrying out subsequent construction after the temporary plugging knots are dissolved.
8. The use of a deformable degradable tie temporary plugging ball according to claim 7, wherein said tie temporary plugging ball is suitable for use in reservoirs at 50 ℃ -130 ℃.
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| CN111574979A (en) * | 2020-05-25 | 2020-08-25 | 北京易联结科技发展有限公司 | Temporary plugging agent with tassel-shaped two ends, preparation method and application thereof |
| CN113150757A (en) * | 2021-02-03 | 2021-07-23 | 四川申和新材料科技有限公司 | High-strength degradable flexible rope knot blasthole temporary plugging agent and preparation and application methods thereof |
| CN113445979A (en) * | 2021-07-06 | 2021-09-28 | 古莱特科技股份有限公司 | Rope knot temporary plugging ball for staged fracturing of oil and gas field, method and application |
| CN113637466A (en) * | 2021-08-27 | 2021-11-12 | 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 |
| CN114033331A (en) * | 2021-03-24 | 2022-02-11 | 中国石油天然气集团有限公司 | Rope knot type temporary plugging agent and temporary plugging method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111574979A (en) * | 2020-05-25 | 2020-08-25 | 北京易联结科技发展有限公司 | Temporary plugging agent with tassel-shaped two ends, preparation method and application thereof |
| CN113150757A (en) * | 2021-02-03 | 2021-07-23 | 四川申和新材料科技有限公司 | High-strength degradable flexible rope knot blasthole temporary plugging agent and preparation and application methods thereof |
| CN114033331A (en) * | 2021-03-24 | 2022-02-11 | 中国石油天然气集团有限公司 | Rope knot type temporary plugging agent and temporary plugging method |
| CN113445979A (en) * | 2021-07-06 | 2021-09-28 | 古莱特科技股份有限公司 | Rope knot temporary plugging ball for staged fracturing of oil and gas field, method and application |
| CN113637466A (en) * | 2021-08-27 | 2021-11-12 | 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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