CN104610644A - Screw drill stator made using ECTFE and modified ECTFE applied to the stator - Google Patents
Screw drill stator made using ECTFE and modified ECTFE applied to the stator Download PDFInfo
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- CN104610644A CN104610644A CN201410699920.7A CN201410699920A CN104610644A CN 104610644 A CN104610644 A CN 104610644A CN 201410699920 A CN201410699920 A CN 201410699920A CN 104610644 A CN104610644 A CN 104610644A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/06—Elements
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/02—Fluid rotary type drives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The present invention discloses a screw drill stator made using ECTFE. From the outer to the inner, the stator sequentially mainly comprises a stator metal outer tube, a polymeric layer, the polymeric layer is made from ECTFE and modified ECTFE materials applied to the stator. The screw drill stator made using ECTFE largely improves the high temperature resistance and abrasion resistance of the stator, is easy to use, has a low wear rate, effectively extends the service life of equipment, has good adaptability to bad surroundings, has low maintenance difficulty, effectively improves the efficiency of drilling operation, and largely reduces the operation costs.
Description
Technical field
The present invention relates to a kind of heat-resistant antifriction corrosion-resistant and there is the ECTFE of high working property and the application on helicoid hydraulic motor thereof, particularly the screw drilling tool stator that makes of a kind of ECTFE of use and the modification ECTFE that is applied to this stator.
Background technology
Helicoid hydraulic motor (PDM drill) i.e. screw drill is a kind of is power with drilling fluid, liquid pressure can be transferred to the positive displacement mud motor of mechanical energy.The mud stream pumped when slush pump enters motor through by-pass valve, forms certain pressure difference at the import and export of motor, and drive rotor rotates around the axis of stator, and rotating speed and moment of torsion are passed to drill bit by versatile spindle and transmission shaft, thus realizes drilling operation.
Screw drill is used to beat upright opening the earliest, is mainly used to beat various directional hole and special engineered hole (as mine freezing hole).Maximum drilling depth reaches 9023 meters.Screw drill minimum diameter is 44.5 millimeters in the world at present, and maximum diameter is 304.8 millimeters.When utilizing screw drill to carry out core drilling, should add that between drive shaft and drill bit rock core taked by basket.
Screw drill is generally made up of by-pass valve, screw motor (rotor and stator), a few part of universal joint, bearing and drive shaft, and its core is screw motor.In screw motor rotor, stator transmission pair, more than rotor number of teeth Z2 one of stator number of teeth Z1 is Z1=Z2+1.Their gear ratio is commonly referred to transmitting ratio, during design, can select arbitrarily (1:2,2:3 ..., 9:10).In actual design work, design high-revolving screw drill and should adopt little gear ratio screw motor, and the screw drill designing low-speed big should adopt large gear ratio screw motor.Along with the increase of rotor stator gear ratio, its efficiency is tending towards declining gradually; The output torque of screw drill is determined by the working pressure drop of pipeline of motor, and output speed is determined by the flow of screw motor working medium.
During probing, still need the conventional drilling equipments such as miser, slush pump, drilling rod and boring tower.During construction directional drilling, directed to kickover tool by direction finder.Toggle joint, curved outer tube and eccentric block etc. are had with the matching used kickover tool of screw drill.Adopt screw drill construction directional hole to improve drilling quality, provide accurate geologic information, save drilling depth, reduce costs, solve many engineering roadblocks that cannot construct, therefore, it is a kind of Special Tool of drilling project.
The work-ing life of screw drill is generally 150 ~ 200 hours, and its weak link is that the high temperature resistant degree of stator rubber is low, and bearing is fragile.Step up resistance to wear resistant to elevated temperatures resilient material and the reliable bearing arrangement of manufacture and exploit for the manufacture of stator, thus the working life of screw drill is significantly improved, develop low-speed big screw rod to be applicable to the key breakthrough direction that drilling deep hole and superdeep holes are also this areas simultaneously.
Existing screw drilling tool stator sheath material is respectively NBR and HNBR, wherein the long-term temperature of hot hole is close to 170 DEG C, and the ultimate temperature of HNBR (static state) is 176 DEG C, according to the performance characteristics of helicoid hydraulic motor, temperature is easy to the part concentrating on rubber and rotor contact, the dynamic heat build up mutually extrude between stator and rotor, reversed.When temperature is higher and concentrate on above region for a long time, then will causes ageing of rubber, thus cause rubber failure.General more than 100 hours of the work-ing life of helicoid hydraulic motor sheath material of hot hole.Life cycle is short, and maintenance requirement is high, have impact on the efficiency of drilling well work and carries out progress, increases drilling cost.
Summary of the invention
For solving the problem, the invention discloses the screw drilling tool stator that a kind of ECTFE of use makes and the modification ECTFE being applied to this stator, by utilizing ECTFE in wear-resistant, high temperature resistant, in frictional coefficient is low, operating temperature range is wide etc. advantage, thus it is interval and in wear rate etc., effectively improve the performance of drilling tool in the working temperature of screw drilling tool stator, thus greatly extend the work-ing life of screw drilling tool stator, reduce production maintenance cost, improve drilling efficiency.
The screw drilling tool stator that use ECTFE disclosed by the invention makes, be mainly stator metal outer pipe, polymer layer successively from outside to inside, polymer layer adopts ECTFE to make.ECTFE is utilized to prepare the polymer layer of stator in the present invention program, this programme is breakthroughly in screw drilling tool stator, thus make screw drilling tool stator have better wear resistance and resistance to elevated temperatures, be suitable for the harsh Working environment of drilling well high temperature, corrosion, thus greatly extend the work-ing life of stator, reduce the maintenance cost of equipment.
Preferred as one, polymer layer inwall or outer wall are provided with the thread groove of indent, thread groove is provided with at least 1 and is arranged on side by side on the wall of polymer layer, and the hand of spiral of thread groove is all consistent and with stator center axle for its hand of spiral stretching, extension axle.This programme can arrange thread groove structure on the inwall of stator or on outer wall or on inwall and outer wall, can match identical with the corresponding thread groove arranged on stator metal outer pipe inwall by the thread groove structure that outer wall is arranged, play and fix more stable effect with stator metal outer pipe, stator structure stability can be improved, increase the service life, simultaneously according to the needs of production and application, the quantity of setting thread groove, be uniformly distributed on wall or uneven distribution or be closely adjacent to arrange on wall partly, the structure of stator is made to have larger handiness, stator can according to rotor power, the parameter of the aspects such as torque comes arrangement and the design of actual selection thread groove.
Preferred as one, thread groove is adjacent to be arranged on whole polymer layer inwall or outer wall side by side.In this programme, thread groove is arranged on the inwall of whole polymer layer or the surface of outer wall with the mode spiral of or arranged side by side many, thus make stator to the torque power more stable and uniform of rotor, avoid in production operation process, because of unbalance stress, equipment is caused damage, thus can work-ing life of extension device, reduce production cost.
The modification ECTFE being applied to screw drilling tool stator disclosed by the invention, described each component composition (with weight parts) is: ECTFE100 part, Graphene chip material 3-5 part, carbon skeleton nickel porous 5-10 part.The present invention is based on the advantage of ECTFE in use temperature interval, resistance to elevated temperatures, abrasion resistance properties and stability etc., ECTFE is applied to screw drilling tool stator, thus the deformation be effectively reduced in life-time service and loss, improve the tolerance of stator to environmental factorss such as drilling well high temperature, high humidity, corrodibility, thus greatly extend the work-ing life of stator-device, reduce the operation and maintenance cost of helicoid hydraulic motor and stator thereof, and improve the efficiency of production.
Preferred as one, Graphene chip material and carbon skeleton nickel porous are all by oxygen deprivation hydrogen flame calcination activation 1-3min pre-treatment.
Preferred as one, the diameter of Graphene chip material is 10-20 micron.
Graphene (Graphene) a kind ofly forms with sp2 hybridized orbital the flat film that hexangle type is honeycomb lattice by carbon atom, only has the two-dimensional material of a carbon atom thickness, Graphene is the thinnest in the world is also the hardest nano material, and it is almost completely transparent, only absorbs the light of 2.3%; Thermal conductivity is up to 5300 W/(mK), higher than carbon nanotube and diamond.
Nickel porous possesses multiple superior physical properties as light weight, fire-retardant, very strong energy absorption capacity, and has a wide range of applications.In this programme carbon skeleton nickel porous be carbon fiber after surface coarsening process (as with certain density ammonium persulphate and sulfuric acid mixture liquid corrosion carbon fiber surface, reduce carbon fiber surface smooth finish, improve the binding ability of nickel dam and carbon fiber), at carbon fiber surface electroless plating nickel porous thin layer.
The stator of the helicoid hydraulic motor of application ECTFE disclosed by the invention, the stator metal outer pipe comprising cast and the polymer layer mated on compact siro spinning technology stator metal outer pipe inwall, polymer layer and stator metal outer pipe are coaxially arranged, polymer layer wall is provided with the thread groove of indent, thread groove is provided with at least 3 and is arranged on side by side on the wall of polymer layer, and the hand of spiral of thread groove is all consistent and with stator center axle for its hand of spiral stretching, extension axle.
Preferred as one, thread groove is adjacent to be arranged on whole polymer layer inwall side by side.Simultaneously stator outer wall can not have thread groove, to reduce difficulty of processing, can thread groove be set yet, be engaged ability to improve between stator with stator metal outer pipe, improve the steadiness of stator.
The present invention is by adopting ECTFE to be screw drilling tool stator, and the stator tool making drilling tool and apply this drilling tool has the following advantages, high temperature resistant---and use working temperature can reach more than 170 DEG C.
Low temperature resistant---there is good mechanical tenacity; Namely drop temperature to-196 DEG C, also can keep the elongation of 5%.
Corrosion-resistant---to most of pharmaceutical chemicals and solvent, show inertia, energy strong alkali-acid resistance, water and various organic solvent.
Weather---there is aging life-span best in plastics.
High lubrication---be frictional coefficient the lowest in solid material.
Screw drilling tool stator can be met preferably at the right high request of subterranean well environment.
The invention has the advantages that:
A. ECTFE life-time service temperature disclosed by the invention is more than 150 DEG C, and time more than 200 DEG C, throws away and have good Practical Performance, is greatly better than stator current phase material NBR and HNBR;
B. excellent wear resistance and creep resistance, have less compression set than PTFE, better rebound resilience;
C. and the long-term corrosion of ability drilling fluid, strong alkali-acid resistance;
D. more than 250h can be increased to exceed work-ing life;
E. stator can be shaping with general expressing technique, and processibility is good, and complete processing is simple, greatly cuts down finished cost;
F. simultaneously by adopting Graphene chip material and carbon skeleton nickel porous to strengthen ECTFE, the high heat conduction of Graphene and high-strength system can be utilized to strengthen material itself in structural system, the mechanical property of strengthening material and heat conductivility, delaying retrogradation and fret wear, utilize tangling and penetrating of the hexagonal reticulated structure of Graphene honeycomb type and PFA chain-like structure simultaneously, realize the connection to the crystallization in ECTFE body material and non-crystalline areas, crackle, connection of stress Nesting Zone etc. thus improve the mechanical property of material from microscopic pattern, strengthen stretchiness and abradability, and be aided with the transfer of carbon skeleton nickel porous structure counter stress, the advantage of the aspects such as impact and with ECTFE mixed binding, thus greatly can improve tensile property and the wear resisting property of material, the effect of different crystallizing field or non-crystalline region can be played at material internal, reduce the impact of interfacial effect and stress, thus greatly improve mechanical property and the processing characteristics of ECTFE.Thus effectively can extend the work-ing life of stator, extend maintenance intervals, reduce the maintenance cost of production and equipment.
Accompanying drawing explanation
The structural representation of a kind of embodiment of Fig. 1, stator disclosed by the invention;
The front view (polymer layer is uniform thickness not) of a kind of embodiment of Fig. 2, stator disclosed by the invention;
The front view (polymer layer uniform thickness) of the another kind of embodiment of Fig. 3, stator disclosed by the invention.
Reference numerals list:
1, stator metal outer pipe; 2, polymer layer; 3, rotor.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, following embodiment should be understood and be only not used in for illustration of the present invention and limit the scope of the invention
The screw drilling tool stator that use ECTFE disclosed by the invention makes, be mainly stator metal outer pipe 1, polymer layer 2 from outside to inside successively, it is characterized in that, described polymer layer adopts ECTFE to make, and caking agent can be adopted between stator metal outer pipe 1 with polymer layer 2 to be combined.
Preferred as one, polymer layer 2 inwall or outer wall are provided with the thread groove of indent, thread groove is provided with at least 1 and is arranged on side by side on the wall of polymer layer, and the hand of spiral of thread groove is all consistent and with stator center axle for its hand of spiral stretching, extension axle.
Preferred as one, described thread groove is adjacent to be arranged on whole polymer layer 2 inwall or outer wall side by side.
The modification ECTFE being applied to screw drilling tool stator disclosed by the invention, each component composition (with weight parts) is: ECTFE100 part, Graphene chip material 3-5 part, carbon skeleton nickel porous 5-10 part.
Preferred as one, Graphene chip material and carbon skeleton nickel porous are all by oxygen deprivation hydrogen flame calcination activation 1-3min pre-treatment.
Preferred as one, the diameter of Graphene chip material is 10-20 micron.
Embodiment
Following examples comprise following examples be in the content of the technical solution of the present invention comprised Graphene chip material and carbon skeleton nickel porous after mixing, in graphite furnace, tiling is thin layer, and in hydrogen atmosphere, the active group of Graphene chip material and carbon skeleton porous nickel surface within 1-3 minute, is activated with the calcination of oxygen deprivation hydrogen flame, thus improve the binding ability of all the other ECTFE materials, reduce the stress of bonding interface.
Embodiment 1
The each component of the present embodiment (with weight parts) consists of: ECTFE100 part, Graphene chip material 3 parts, carbon skeleton nickel porous 5 parts.
During production, ECTFE, carbon fiber nanotube, football alkene C540 after high speed muller mixes, by extrude or the mode such as injection moulding or die casting is shaping obtains wherein that a kind of application structure is as Figure 1-3.
The present embodiment product detects through sampling, and result is as follows, and it is 300h that duration of service is stablized in down-hole, and life-time service temperature is greater than 150 degree.
Embodiment 2
The each component of the present embodiment (with weight parts) consists of: ECTFE100 part, Graphene chip material 4 parts, carbon skeleton nickel porous 10 parts.
During production, ECTFE, carbon fiber nanotube, football alkene C540 after high speed muller mixes, by extrude or the mode such as injection moulding or die casting is shaping obtains wherein that a kind of application structure is as Figure 1-3.
The present embodiment product detects through sampling, and result is as follows, and it is 400h that duration of service is stablized in down-hole, and life-time service temperature is greater than 170 degree.
Embodiment 3
The each component of the present embodiment (with weight parts) consists of: ECTFE100 part, Graphene chip material 5 parts, carbon skeleton nickel porous 8 parts.
During production, ECTFE, carbon fiber nanotube, football alkene C540 after high speed muller mixes, by extrude or the mode such as injection moulding or die casting is shaping obtains wherein that a kind of application structure is as Figure 1-3.
The present embodiment product detects through sampling, and result is as follows, and it is 640h that duration of service is stablized in down-hole, and life-time service temperature is greater than 190 degree.
Embodiment 4
The each component of the present embodiment (with weight parts) consists of: ECTFE100 part, Graphene chip material 3.5 parts, carbon skeleton nickel porous 7 parts.
During production, ECTFE, carbon fiber nanotube, football alkene C540 after high speed muller mixes, by extrude or the mode such as injection moulding or die casting is shaping obtains wherein that a kind of application structure is as Figure 1-3.
The present embodiment product detects through sampling, and result is as follows, and it is 500h that duration of service is stablized in down-hole, and life-time service temperature is greater than 200 degree.
Embodiment 5
The each component of the present embodiment (with weight parts) consists of: ECTFE100 part, Graphene chip material 4.5 parts, carbon skeleton nickel porous 9 parts.
During production, ECTFE, carbon fiber nanotube, football alkene C540 after high speed muller mixes, by extrude or the mode such as injection moulding or die casting is shaping obtains wherein that a kind of application structure is as Figure 1-3.
The present embodiment product detects through sampling, and result is as follows, and it is 750h that duration of service is stablized in down-hole, and life-time service temperature is greater than 160 degree.
Embodiment 6
The each component of the present embodiment (with weight parts) consists of: ECTFE100 part, Graphene chip material 3.7 parts, carbon skeleton nickel porous 6 parts.
During production, ECTFE, carbon fiber nanotube, football alkene C540 are even through high-speed mixing, by extrude or the mode such as injection moulding or die casting is shaping obtains wherein that a kind of application structure is as Figure 1-3.
The present embodiment product detects through sampling, and result is as follows, and it is 250h that duration of service is stablized in down-hole, and life-time service temperature is greater than 180 degree.
Embodiment 7
The each component of the present embodiment (with weight parts) consists of: ECTFE100 part, Graphene chip material 3.2 parts, carbon skeleton nickel porous 7.5 parts.
During production, ECTFE, carbon fiber nanotube, football alkene C540 are even through high-speed mixing, by extrude or the mode such as injection moulding or die casting is shaping obtains wherein that a kind of application structure is as Figure 1-3.
The present embodiment product detects through sampling, and result is as follows, and it is 1000h that duration of service is stablized in down-hole, and life-time service temperature is greater than 170 degree.
Embodiment 8
The each component of the present embodiment (with weight parts) consists of: ECTFE100 part, Graphene chip material 4.1 parts, carbon skeleton nickel porous 8.1 parts.
During production, ECTFE, carbon fiber nanotube, football alkene C540 are even through high-speed mixing, by extrude or the mode such as injection moulding or die casting is shaping obtains wherein that a kind of application structure is as Figure 1-3.
The present embodiment product detects through sampling, and result is as follows, and it is 800h that duration of service is stablized in down-hole, and life-time service temperature is greater than 190 degree.
Embodiment 9
The each component of the present embodiment (with weight parts) consists of: ECTFE100 part, Graphene chip material 4.7 parts, carbon skeleton nickel porous 6.3 parts.
During production, ECTFE, carbon fiber nanotube, football alkene C540 are even through high-speed mixing, by extrude or the mode such as injection moulding or die casting is shaping obtains wherein that a kind of application structure is as Figure 1-3.
The present embodiment product detects through sampling, and result is as follows, and it is 750h that duration of service is stablized in down-hole, and life-time service temperature is greater than 150 degree.
Embodiment 10
The each component of the present embodiment (with weight parts) consists of: ECTFE100 part, Graphene chip material 4.3 parts, carbon skeleton nickel porous 7.1 parts.
During production, ECTFE, carbon fiber nanotube, football alkene C540 are even through high-speed mixing, by extrude or the mode such as injection moulding or die casting is shaping obtains wherein that a kind of application structure is as Figure 1-3.
The present embodiment product detects through sampling, and result is as follows, and it is 800h that duration of service is stablized in down-hole, and life-time service temperature is greater than 200 degree.
The stator of the helicoid hydraulic motor of application ECTFE disclosed by the invention, the stator metal outer pipe 1 comprising cast and the polymer layer 2 mated on compact siro spinning technology stator metal outer pipe 1 inwall, polymer layer 2 and stator metal outer pipe 1 are coaxially arranged, the thread groove that only can be provided with indent on polymer layer 2 inwall (forms the polymer layer 2 not waiting wall thickness, see Fig. 2), also thread groove (the polymer layer 2 of the wall thickness such as formation of indent can be provided with on polymer layer 2 inner and outer wall, see Fig. 3), the thread groove that also only can be provided with indent when some is special on polymer layer 2 outer wall forms the polymer layer 2 not waiting wall thickness, thread groove is provided with at least 3 and is arranged on polymer layer 2 inwall side by side, the hand of spiral of thread groove is all consistent and with polymer layer 2 central shaft for its hand of spiral stretching, extension axle, polymer layer 2 material all utilizes aforementioned ECTFE, but this material is not limited to this application.
Preferred as one, thread groove is adjacent to be arranged on whole polymer layer 2 inwall side by side, and namely between the peak valley of adjacent two thread grooves and peak base, seamless close apposition is arranged.Polymer layer 2 outer wall can not have thread groove, to reduce difficulty of processing yet simultaneously.
Operationally, rotor 3 is drilled along spiral slot precession under pressure-driven in polymer layer 2, realizes normal working.
The non-limit part of technical scope mid point value that this place embodiment is protected application claims, equally all in the scope of protection of present invention.
Technique means disclosed in the present invention program is not limited only to the technique means disclosed in above-mentioned technique means, also comprises the technical scheme be made up of above technical characteristic arbitrary combination.The above is the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (6)
1. use the screw drilling tool stator that ECTFE makes, be mainly stator metal outer pipe, polymer layer successively from outside to inside, it is characterized in that, described polymer layer adopts ECTFE to make.
2. the screw drilling tool stator of use ECTFE according to claim 1 making, it is characterized in that, described polymer layer inwall or outer wall are provided with the thread groove of indent, described thread groove is provided with at least 1 and is arranged on side by side on the wall of polymer layer, and the hand of spiral of described thread groove is all consistent and with stator center axle for its hand of spiral stretching, extension axle.
3. the screw drilling tool stator of use ECTFE according to claim 1 making, it is characterized in that, described thread groove is adjacent to be arranged on whole polymer layer inwall or outer wall side by side.
4. be applied to a modification ECTFE material for screw drilling tool stator, it is characterized in that: described each component composition (with weight parts) is: ECTFE100 part, Graphene chip material 3-5 part, carbon skeleton nickel porous 5-10 part.
5. the modification ECTFE material being applied to screw drilling tool stator according to claim 4, is characterized in that: described Graphene chip material and carbon skeleton nickel porous are all by oxygen deprivation hydrogen flame calcination activation 1-3min pre-treatment.
6. the modification ECTFE material being applied to screw drilling tool stator according to claim 4 or 5, is characterized in that: the diameter of described Graphene chip material is 10-20 micron.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410699920.7A CN104610644A (en) | 2014-11-28 | 2014-11-28 | Screw drill stator made using ECTFE and modified ECTFE applied to the stator |
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| CN201410699920.7A CN104610644A (en) | 2014-11-28 | 2014-11-28 | Screw drill stator made using ECTFE and modified ECTFE applied to the stator |
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