CN105690648A - Manufacturing method for tapered sleeve component of bridge plug combined tool - Google Patents
Manufacturing method for tapered sleeve component of bridge plug combined tool Download PDFInfo
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- CN105690648A CN105690648A CN201410705905.9A CN201410705905A CN105690648A CN 105690648 A CN105690648 A CN 105690648A CN 201410705905 A CN201410705905 A CN 201410705905A CN 105690648 A CN105690648 A CN 105690648A
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Abstract
The invention relates to a manufacturing method for a tapered sleeve component of a bridge plug combined tool. One or two kinds of fluorine-containing engineering resin are blended to serve as basic resin, or glass fiber or magnesium sulfate crystal whiskers are added to the fluorine-containing engineering resin to be blended, the blended special material is manufactured, and then injection molding is carried out. The modulus of the tapered sleeve component in the bridge plug combined tool is increased, the balance of the elongation at break and the modulus of the tapered sleeve component is adjusted, and the application requirements for the bridge plug combined tool in the oil and gas filed well-completion work are met. The fluorine-containing engineering resin blended special material is especially suitable for producing a tapered sleeve through the injection molding method, and the complexity caused by selection and use of other materials in the die pressing method molding process is overcome.
Description
Technical field
The preparation method that the present invention relates to a kind of bridging plug cluster tool components taper sheath。
Background technology
Bridging plug tool kit, as exploitation shale gas, carries out one of main tool of underground fracture construction, is the core technology of the resource operation process such as exploitation shale gas。But the working environment of bridging plug tool kit is increasingly sophisticated, the bridging plug that conventional metal material and elastomeric material make can not meet far away the requirement of the working environment at coal mines of harshness。Want development of new bridging plug tool kit, meet the demand of down-hole harsh environments, it is necessary first to have breakthrough on the material manufacturing bridging plug cluster tool components, select acid and alkali-resistance, functional material high pressure resistant, corrosion-resistant, resistant to elevated temperatures。Exploitation tight gas and shale gas composite bridging plug, not only bridging plug tool kit lightweight, and post-fracturing brill milling speed improves a lot, a few hours from conventional metals bridging plug tool kit, bring up to about 15min, substantially reduce the completion practice time, improve well completion work efficiency。
Wherein, the taper sheath parts in bridging plug tool kit are the critical components of protection main seal (rubber packing element), improve pressure performance and the sealing property of packing element。These parts are except requiring the working environments such as the high temperature (>=150 DEG C) of resistance to down-hole, high pressure, acid and alkali corrosion, in addition it is also necessary to have enough hot strengths and elongation at break, bear significantly deformation to meet and are not destroyed in setting fracturing process。Thus, taper sheath is the critical component that bridging plug tool kit realizes sealing pressure holding function。
In existing domestic and international patented technology, in domestic patent ZL200220128741.4, bonding resistant to elevated temperatures in the one or both sides of packing element and and the plastics shoulder protector of packing element together sulfidization molding, plastics shoulder protector is resistant to elevated temperatures plastics or rubber plastic blend macromolecular material, the method needs to select suitable bonding agent and strict sulfuration process, meets the sealing property of packing element；In patent ZL200620031888.6; packing element is used to protect bowl; protect bowl generally umbrella-shaped structure; on the outside longitudinal surface protect bowl main body, design has symmetrical fine strip shape to strengthen strangling; after packing element seals, protecting the reinforcement Le of the fine strip shape outside bowl main body can increase the protection intensity protecting bowl to packing element, is effectively prevented shoulder and the flowing of packing element; improve the sealing property of packing element, but it is complex to strangle, with reinforcement, the processing technique protecting bowl。External such as Halliburton Energy Services, Inc. of the U.S., Smith's oilfield service companies, BJ Service Co., Vad good fortune international corporation, the drilling well of the companies such as Bake Hughes international corporation, the development technique of completion practice instrument is highly developed, development through several generations has overcome many drawbacks, form respective patented technology, such as US7424909B2, US208/0132960A1, US5271468, US6220349B1, US5271468C1, US5431412, US7735549B1, US6318461B1, US7779927B2, US6712153B2, US2008/0173453A1, US7600572B2。The external material protecting bowl as seal member packing element is ether modified Teflon (PFA) at present, adds the inorganic filler of 30%, by hot press moulding method molding, produces substantial amounts of not recyclable waste material in forming process。Ether modified teflon material market consumption is little, and relative price is higher, and ether modified Teflon processing temperature is high, it is necessary to using hot press moulding moulding process, technique is more complicated, and processing cost is of a relatively high。
Resin based on the general fluorine-containing engineering resin of this choice of technology, by adding glass fibre or magnesium sulfate crystal whisker, adopts injection molding process method processing taper sheath, meets bridging plug cluster tool components taper sheath instructions for use。
Summary of the invention
It is an object of the invention to provide a kind of preparation method for producing bridging plug cluster tool components taper sheath, it is critical only that of the present invention selects suitable fluorine-containing engineering resin, is particularly well-suited to injection molding process。
For achieving the above object, the invention provides a kind of preparation method for producing bridging plug cluster tool components taper sheath, comprise the steps:
(A) adopt base resin as raw material, carry out melt blending, molding；
(B) shaped article that step A obtains is carried out heat treatment, obtain final taper sheath parts；
Wherein said base resin is that one or both of fluorine-containing engineering resin are blended, or it is blended to add inorganic filler in fluorine-containing engineering resin, described in be shaped to injection mo(u)lding。
The preparation method of bridging plug cluster tool components taper sheath of the present invention, the wherein said preferred vinylidene fluoride of fluorine-containing engineering resin, tetrafluoroethene, hexafluoropropene, tetrafluoroethene base ether, the homopolymer of hexafluoropropene base ether or binary, terpolymer。
The purpose that the fluorine-containing engineering resin mixing of above-mentioned selection uses is the balance of regulation and control PP Pipe Compound mechanical property and processing characteristics。
The preparation method of bridging plug cluster tool components taper sheath of the present invention, the melt flow index range preferably 0.5～60g/10min, more preferably 5～20g/10min of wherein said fluorine-containing engineering resin。
The preparation method of bridging plug cluster tool components taper sheath of the present invention, the preferred glass fibre of wherein said inorganic filler or magnesium sulfate crystal whisker。
The preparation method of bridging plug cluster tool components taper sheath of the present invention, the adding proportion of wherein said glass fibre or magnesium sulfate crystal whisker and base resin weight ratio preferably 0.05～0.5:1。
The preparation method of bridging plug cluster tool components taper sheath of the present invention, the temperature of wherein said melt blending preferably 280～370 DEG C, the temperature of described injection mo(u)lding preferably 320～370 DEG C, the pressure of described injection mo(u)lding preferably 50～110bar, described heat treatment temperature preferably 200～250 DEG C。
The preparation method of bridging plug cluster tool components taper sheath of the present invention, the method is particularly well-suited to injection molding forming method and produces taper sheath, can well meet the application in oil gas field completion practice of the bridging plug tool kit。
The mechanical behavior under high temperature method of testing of bridging plug cluster tool components taper sheath of the present invention is that the oven temperature that mechanical behavior under high temperature is tested universal testing machine is set as 150 DEG C, temperature reach 150 DEG C after constant temperature 30min。The batten of preparation is installed on the fixture of coupling, puts into baking oven, constant temperature 5min at 150 DEG C, then press the mechanical property of test bars under the draw speed of 5mm/min, other experiment condition is with reference to GB840-2006。
The preparation method of batten following (batten makes drawing and sees Fig. 1):
(1) by taper sheath along central axis direction, with 30mm width, dicing；
(2) the rectangle print of cutting is placed on milling machine, long side milling is put down；
(3) using diameter is Φ 25mm, and chamfering is the milling cutter of 5mm, goes out the groove of dumbbell shape structure from center, batten long limit time processing, it is desirable to both sides chamfering is symmetrical；
(4) final batten smooth surface, indefectible, and can retain gate location information etc., and the center parallel section length of batten is 15mm。
Advantage of the invention is that the domestic fluorine-containing engineering resin that can stably supply of selection, it is determined that suitable fabrication process condition, produce bridging plug cluster tool components taper sheath, reduce and produce bridging plug cluster tool components taper sheath material cost。
The present invention another advantage is that with domestic fluorine-containing engineering resin, and adopting injection molding forming method to produce taper sheath, production technology is relatively easy, reduces processing cost。
By contrast, utilizing hot press moulding method to produce bridging plug cluster tool components taper sheath, the design of pressing mold is relatively complicated with manufacture, and first investment is higher, and product size is limited by equipment。Further needing exist for releasing agent, diluent, surface-treated agent, filling intensity loss is relatively big, and specific volume is big, die-filling difficulty during mold pressing, and need to adopt multiple-prepressing program matched moulds, and labor condition is not good enough。And select suitable fluorine-containing engineering resin, reduce and produce bridging plug cluster tool components taper sheath material cost；Adopting injection molding forming method to produce taper sheath, production technology is relatively easy, reduces processing cost, meets bridging plug tool kit completion practice instructions for use。
Accompanying drawing explanation
Fig. 1 is that batten makes drawing。
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, but the present invention is not by the restriction of following embodiment。The change of any design without departing from the present invention and category, is within the scope of the present invention。
The kind of fluorine-containing engineering resin:
In the present invention, the kind of fluorine-containing engineering resin is not particularly limited, for instance can enumerate: vinylidene fluoride, tetrafluoroethene, hexafluoropropene, tetrafluoroethene base ether, the homopolymer of hexafluoropropene base ether or binary, terpolymer。
The melt flow index of fluorine-containing engineering resin:
In the present invention, the melt flow index of fluorine-containing engineering resin is not particularly limited, generally chooses 0.5～60g/10min, it is preferable that 5～20g/10min。If the melt flow index of fluorine-containing engineering resin is less than 0.5g/10min, then there is product and produce the possibility of stress defect。And if the melt flow index of fluorine-containing engineering resin more than 60g/10min time, then there is product and melt the possibility of vertical deformation。
The kind of inorganic filler:
In the present invention, the kind of inorganic filler is not particularly limited, for instance glass fibre or magnesium sulfate crystal whisker can be chosen。
The addition of glass fibre or magnesium sulfate crystal whisker:
In the present invention, the addition of glass fibre or magnesium sulfate crystal whisker being not particularly limited, the weight ratio of the addition and base resin of generally choosing glass fibre or magnesium sulfate crystal whisker is 0.05～0.5:1。If the weight ratio of the addition of glass fibre or magnesium sulfate crystal whisker and base resin is less than 0.05:1, then there is the possibility that modulus is too low。And if the weight ratio of the addition of glass fibre or magnesium sulfate crystal whisker and base resin more than 0.5:1 time, then there is the possibility that hot strength is too low。
The temperature conditions of melt blending:
In the present invention, the temperature conditions of melt blending is not particularly limited, is generally 280～370 DEG C。If the temperature of melt blending is less than 280 DEG C, then there is the possibility that plasticizing is uneven。And if the temperature of melt blending more than 370 DEG C time, then there is the possibility of Partial digestion。
The temperature conditions of injection mo(u)lding:
In the present invention, the temperature conditions of injection mo(u)lding is not particularly limited, is generally 320～370 DEG C。If the temperature of injection mo(u)lding is less than 320 DEG C, then there is plasticizing inequality and cause the possibility of product stress defect。And if the temperature of injection mo(u)lding more than 370 DEG C time, then there is the possibility that Partial digestion makes mechanical property reduce。
The pressure condition of injection mo(u)lding:
In the present invention, the pressure condition of injection mo(u)lding is not particularly limited, is generally 50～110bar。If the pressure of injection mo(u)lding is less than 50bar, then there is die cavity charge discontented or there is bubble and cause the possibility of product defect。And if the pressure of injection mo(u)lding more than 110bar time, then there are goods and adhere to the possibility in mould。
Heat treated temperature conditions:
In the present invention, heat treated temperature conditions is not particularly limited, is generally 200～250 DEG C。If heat treated temperature is less than 200 DEG C, then there is the possibility producing weld mark。And if heat treated temperature more than 250 DEG C time, then there is the possibility of goods buckling deformation。
Embodiment 1
The preparation of bridging plug cluster tool components taper sheath, be 2.0g/10min by melt flow index (MFR) 1, two kinds of engineering resins of the tetrafluoroethene B of 1 difluoroethylene A and 8.0g/10min, with the weight ratio A:B blended 10min of the ratio being 2:8, it is directly added into injection machine after mixing and carries out the injection molding of taper sheath parts。The temperature of melt blending is 320 DEG C, and the temperature of injection mo(u)lding is 350 DEG C, and the pressure of described injection mo(u)lding is 80bar, the taper sheath parts of injection moulding gained heat treatment 10min at 230 DEG C, then naturally cools to room temperature, and mechanical behavior under high temperature test result is in Table 1。
Preparing batten (batten makes drawing and sees Fig. 1) by the following method, and the batten prepared is carried out mechanical behavior under high temperature test, result is in Table 1。
(1) by taper sheath along central axis direction, with 30mm width, dicing；
(2) the rectangle print of cutting is placed on milling machine, long side milling is put down；
(3) using diameter is Φ 25mm, and chamfering is the milling cutter of 5mm, goes out the groove of dumbbell shape structure from center, batten long limit time processing, it is desirable to both sides chamfering is symmetrical；
(4) final batten smooth surface, indefectible, and can retain gate location information etc., and the center parallel section length of batten is 15mm。
Embodiment 2
According to the operating process of embodiment 1, engineering resin changing the terpolymer of vinylidene fluoride, tetrafluoropropene, hexafluoropropene base ether into, mechanical behavior under high temperature test result is in Table 1。
Embodiment 3
According to the operating process of embodiment 1, changing two kinds of engineering resins into perfluor second the third engineering resin, mechanical behavior under high temperature test result is in Table 1。
Embodiment 4
According to the operating process of embodiment 1, two kinds of engineering resin weight ratio A:B being become 10:1, mechanical behavior under high temperature test result is in Table 1。
Embodiment 5
According to the operating process of embodiment 1, the melt flow index (MFR) of A being adjusted to 0.5g/10min, B and is adjusted to the engineering resin of 15.0g/10min and carries out blended, mechanical behavior under high temperature test result is in Table 1。
Embodiment 6
According to the operating process of embodiment 2, the melt flow index (MFR) of A being adjusted to 0.5g/10min, B and is adjusted to perfluor second third engineering resin of 15.0g/10min and carries out blended, mechanical behavior under high temperature test result is in Table 1。
Embodiment 7
According to the operating process of embodiment 6, two kinds of engineering resin weight ratio A:B are 8:5, and mechanical behavior under high temperature test result is in Table 1。
Embodiment 8
According to the operating process of embodiment 6, two kinds of engineering resin weight ratio A:B are 10:1, and mechanical behavior under high temperature test result is in Table 1。
Embodiment 9
According to the operating process of embodiment 1, Resin A selects tetrafluoroethene, and B selects hexafluoropropene base ether copolymer, and mechanical behavior under high temperature test result is in Table 1。
Embodiment 10
According to the operating process of embodiment 2, Resin A selects tetrafluoroethene, and B selects hexafluoropropene base ether copolymer, and mechanical behavior under high temperature test result is in Table 1。
Embodiment 11
According to the operating process of embodiment 3, Resin A selects tetrafluoroethene, and B selects hexafluoropropene base ether copolymer, and mechanical behavior under high temperature test result is in Table 1。
Embodiment 12
According to the operating process of embodiment 4, Resin A selects tetrafluoroethene, and B selects hexafluoropropene base ether copolymer, and mechanical behavior under high temperature test result is in Table 1。
Embodiment 13
According to the operating process of embodiment 2, Resin A and B hexafluoropropene base ether copolymer, mechanical behavior under high temperature test result is in Table 1。
Embodiment 14
According to the operating process of embodiment 1, adding glass fibre, be 3:10 with base resin weight ratio, mechanical behavior under high temperature test result is in Table 1。
Embodiment 15
According to the operating process of embodiment 1, adding magnesium sulfate crystal whisker, be 3:10 with base resin weight ratio, mechanical behavior under high temperature test result is in Table 1。
Embodiment 16
According to the operating process of embodiment 1, adding glass fibre, be 1:20 with base resin weight ratio, mechanical behavior under high temperature test result is in Table 1。
Embodiment 17
According to the operating process of embodiment 1, adding magnesium sulfate crystal whisker, be 1:20 with base resin weight ratio, mechanical behavior under high temperature test result is in Table 1。
Embodiment 18
According to the operating process of embodiment 13, adding magnesium sulfate crystal whisker, be 1:20 with base resin weight ratio, mechanical behavior under high temperature test result is in Table 1。
Embodiment 19
According to the operating process of embodiment 13, adding magnesium sulfate crystal whisker, be 1:3 with base resin weight ratio, mechanical behavior under high temperature test result is in Table 1。
Embodiment 20
According to the operating process of embodiment 13, adding glass fibre, be 1:3 with base resin weight ratio, mechanical behavior under high temperature test result is in Table 1。
Embodiment 21
According to the operating process of embodiment 1, A is 0.5g/10min hexafluoropropene, and B is 60g/10min tetrafluoroethene base ether, and mechanical behavior under high temperature test result is in Table 1。
Embodiment 22
According to the operating process of embodiment 1, A melt flow index is 5g/10min, B melt flow index is 20g/10min, and mechanical behavior under high temperature test result is in Table 1。
Embodiment 23
According to the operating process of embodiment 1, adding glass fibre, be 0.05:1 with base resin weight ratio, mechanical behavior under high temperature test result is in Table 1。
Embodiment 24
According to the operating process of embodiment 1, adding glass fibre, be 0.5:1 with base resin weight ratio, mechanical behavior under high temperature test result is in Table 1。
Embodiment 25
According to the operating process of embodiment 1, the temperature of melt blending is 280 DEG C, and the temperature of injection mo(u)lding is 370 DEG C, and the pressure of described injection mo(u)lding is 50bar, prepares batten according to above-mentioned batten preparation method, and carries out mechanical behavior under high temperature test result in Table 1。
Embodiment 26
According to the operating process of embodiment 1, the temperature of melt blending is 370 DEG C, and the temperature of injection mo(u)lding is 370 DEG C, and the pressure of described injection mo(u)lding is 50bar, prepares batten according to above-mentioned batten preparation method, and carries out mechanical behavior under high temperature test result in Table 1。
Embodiment 27
According to the operating process of embodiment 1, the temperature of melt blending is 280 DEG C, and the temperature of injection mo(u)lding is 320 DEG C, and the pressure of described injection mo(u)lding is 110bar, prepares batten according to above-mentioned batten preparation method, and carries out mechanical behavior under high temperature test result in Table 1。
Embodiment 28
According to the operating process of embodiment 2, heat treatment temperature is 200 DEG C, and mechanical behavior under high temperature test result is in Table 1。
Embodiment 29
According to the operating process of embodiment 2, heat treatment temperature is 250 DEG C, and mechanical behavior under high temperature test result is in Table 1。
Embodiment 30
According to the operating process of embodiment 1, not carrying out heat treatment, mechanical behavior under high temperature test result is in Table 1。Table Bridge 1 plug cluster tool components taper sheath mechanical behavior under high temperature Measurement results
| Embodiment | Hot strength/MPa | Elongation at break/MPa | Stretch modulus/MPa |
| Embodiment 1 | 6.89 | 201.02 | 63.73 |
| Embodiment 2 | 7.59 | 245.25 | 72.35 |
| Embodiment 3 | 5.45 | 194.56 | 21.45 |
| Embodiment 4 | 5.05 | 180.86 | 16.66 |
| Embodiment 5 | 6.53 | 210.45 | 22.52 |
| Embodiment 6 | 7.84 | 250.03 | 71.12 |
| Embodiment 7 | 5.25 | 186.48 | 18.77 |
| Embodiment 8 | 6.24 | 181.27 | 46.44 |
| Embodiment 9 | 4.85 | 236.45 | 96.25 |
| Embodiment 10 | 5.26 | 243.40 | 135.15 |
| Embodiment 11 | 5.35 | 235.75 | 110.45 |
| Embodiment 12 | 4.05 | 275.34 | 145.26 |
| Embodiment 13 | 4.16 | 283.40 | 186.14 |
| Embodiment 14 | 5.22 | 227.90 | 25.39 |
| Embodiment 15 | 5.02 | 228.56 | 27.86 |
| Embodiment 16 | 5.57 | 159.16 | 16.50 |
| Embodiment 17 | 5.85 | 175.46 | 10.26 |
| Embodiment 18 | 4.98 | 204.52 | 19.43 |
| Embodiment 19 | 5.23 | 110.24 | 45.75 |
| Embodiment 20 | 5.54 | 130.24 | 42.64 |
| Embodiment 21 | 4.96 | 256.40 | 155.15 |
| Embodiment 22 | 4.89 | 220.02 | 54.73 |
| Embodiment 23 | 6.65 | 240.25 | 69.66 |
| Embodiment 24 | 4.50 | 180.55 | 23.45 |
| Embodiment 25 | 4.95 | 195.65 | 18.85 |
| Embodiment 26 | 5.35 | 166.35 | 16.75 |
| Embodiment 27 | 5.26 | 172.31 | 17.45 |
| Embodiment 28 | 6.36 | 198.23 | 60.46 |
| Embodiment 29 | 6.05 | 190.25 | 58.24 |
| Embodiment 30 | 4.72 | 170.45 | 48.65 |
As shown in Table 1, adopt different types of material, add different inorganic fillers, adopt different melt blending conditions, different injection mo(u)lding condition and Different Heat Treatment Conditions, the taper sheath product of different mechanical properties can be obtained, meet the user demand of different underground work condition。
Claims (7)
1. a preparation method for bridging plug cluster tool components taper sheath, comprises the steps:
A, employing base resin, as raw material, carry out melt blending, molding；
B, by step A obtain shaped article carry out heat treatment, obtain final taper sheath parts；
It is characterized in that: described base resin is that one or both of fluorine-containing engineering resin are blended, or it is blended to add inorganic filler in fluorine-containing engineering resin, wherein said be shaped to injection mo(u)lding。
2. the preparation method of bridging plug cluster tool components taper sheath according to claim 1, it is characterized in that: described fluorine-containing engineering resin is vinylidene fluoride, tetrafluoroethene, hexafluoropropene, tetrafluoroethene base ether, the homopolymer of hexafluoropropene base ether or binary, terpolymer。
3. the preparation method of bridging plug cluster tool components taper sheath according to claim 1 and 2, it is characterised in that: the melt flow index range of described fluorine-containing engineering resin is 0.5～60g/10min。
4. the preparation method of bridging plug cluster tool components taper sheath according to claim 3, it is characterised in that: the melt flow index range of described fluorine-containing engineering resin is 5～20g/10min。
5. the preparation method of bridging plug cluster tool components taper sheath according to claim 1, it is characterised in that: described inorganic filler is glass fibre or magnesium sulfate crystal whisker。
6. the preparation method of bridging plug cluster tool components taper sheath according to claim 5, it is characterised in that: the adding proportion of described glass fibre or magnesium sulfate crystal whisker and base resin weight ratio are 0.05～0.5:1。
7. the preparation method of bridging plug cluster tool components taper sheath according to claim 1, it is characterized in that: the temperature of described melt blending is 280～370 DEG C, the temperature of described injection mo(u)lding is 320～370 DEG C, the pressure of described injection mo(u)lding is 50～110bar, and described heat treatment temperature is 200～250 DEG C。
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