CN110103353A - A kind of preparation method of polytetrafluoroethylene (PTFE) composite sand filtering pipe - Google Patents
A kind of preparation method of polytetrafluoroethylene (PTFE) composite sand filtering pipe Download PDFInfo
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- CN110103353A CN110103353A CN201910392982.6A CN201910392982A CN110103353A CN 110103353 A CN110103353 A CN 110103353A CN 201910392982 A CN201910392982 A CN 201910392982A CN 110103353 A CN110103353 A CN 110103353A
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- polytetrafluoroethylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/006—Pressing and sintering powders, granules or fibres
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Dispersion Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Filtering Materials (AREA)
Abstract
The invention belongs to petrochemical industry equipment fields, and in particular to a kind of preparation method of polytetrafluoroethylene (PTFE) composite sand filtering pipe.The present invention makes full use of the polytetrafluoroethylene (PTFE) of the title of " King " as main raw material(s), a kind of reticular structure tubing with high permeability and sand-proof function is prepared, for the sand control screen pipe in petroleum recovery operations.The material mixing that can be specifically extracted with polytetrafluoroethylene (PTFE) or its modified material and one or more high temperature resistants is uniform, the techniques such as extracts by cold pressing --- sintering --- and prepares.Construction technology of the present invention is simple, and effect is significant.The characteristics of filtering tubing has high temperature resistant, anticorrosive, Thief zone, sand control range wide, and sand-blockage ability is strong, low in cost, long service life, can be widely applied to petroleum recovery operations, has good social and economic benefit.
Description
Technical field
The invention belongs to petrochemical industry equipment fields, and in particular to a kind of preparation side of polytetrafluoroethylene (PTFE) composite sand filtering pipe
Method.
Background technique
During oil exploitation, sand production is one of problem common in oil recovery process, it refers to due to oil mining
Chronostratigraphic zone rock texture destruction near shaft bottom is caused to cause the reservoir sand of partial exfoliation with oil reservoir with the various composite factors such as operation
Fluid enters pit shaft together, to cause the process and phenomenon of a series of adverse effect to the normal production of oil well.Shaking out can
It causes sand to bury a series of harm such as oil reservoir, pit shaft sand plug, equipment abrasion sand card, cave-in, casing damage, both improves crude oil
Production cost increase the management difficulty in oil field again.
The reason of sand production in oil, has: the variation of stratigraphic structure stress state, formation rock cementing status, in-place permeability
Influence, the perforation situation of the physical characteristic of reservoir fluid, the working system of oil well, oil well, High water cut to influence shaked out etc. because
Element.Current sand control technique has: mechanical sand control, chemical sand control and composite sand prevention etc..Since mechanical sand control is simple and easy, is constructed into
The advantages that this is low, easily operated.So current sand control technique, the most commonly used is mechanical sand controls, in mechanical sand control, 90%
Sand control is using gravel sand screen sand control.But due to gravel sand screen non-refractory and poor (the heavy oil development need of corrosion resistance
High-temperature vapor injects dilution viscous crude to underground, and high-temperature vapor has very strong alkalinity) cause that service life is short, oil well
The defects of maintenance cost is high, the working time of oil well short (annual individual well has stop production for 80~100 days).For lacking for gravel sand control
It falls into, countries in the world are all studied and inquired into new mechanical sand control, such as ceramic sand filtering pipe, metal wool sand screen, resin
The technologies such as quartzy sand screen, but these technologies all Shortcomings, without large-scale promotion and application.
Either crude oil and viscous crude will carry out sand control in recovery process, but since the prop-carrying capacity of viscous crude is strong, and companion
It can be exploited with high temperature dilution.Therefore, in the recovery process of viscous crude, conditions down-hole is very harsh.Since China's viscous crude amount is more,
Distribution is wide, and heavy oil tested layer, based on megaclast stone, Sandstone Types are more, with oil saturation is low and the spy of high hole, Thief zone
Sign causes the difficulty during oil exploitation to increase, and the cost of oil exploitation is high, to solve the problems, such as this, core it
One the technical issues of being how sand control, develop one kind should high temperature resistant, anticorrosive, and be able to satisfy sand control requirement and easy to operate
Sand screen at the task of top priority.
Summary of the invention
The present invention provides a kind of polytetrafluoroethylene (PTFE) composite filter for many defects for commonly using sand screen in oil exploitation at present
The preparation method of sandpipe.The specific polytetrafluoroethylene (PTFE) using the title for having " King " using granulation and divides as main raw material(s)
Grade is uniformly mixed with the particle that salt matches, and passes through the filter that the techniques such as cold pressing --- sintering --- extraction are prepared into oil exploitation
Sandpipe.Polytetrafluoroethylene (PTFE) composite sand filtering pipe has the characteristics that high temperature resistant, anticorrosive, Thief zone, dredges certainly, easy to operate, effect
Reliably, low in cost, it can be widely applied to the mining operations of oil/gas well, there is good social and economic benefit.
The specific technical solution of the present invention is as follows:
1) polytetrafluoroethylene material selects the polytetrafluoroethylene (PTFE) of 0.2~0.9 ㎜ of partial size to be sieved, by similar in partial size
Material carries out differentiated control, spare；
2) salt selects 0.2~0.9 ㎜ salt particle material of partial size to be sieved, carries out classification pipe by material similar in partial size
It manages, is spare；
3) according to the requirement of the filtering accuracy of sand screen, intensity and penetrating power, the classified polytetrafluoroethyl-ne of match selection
Alkene and salt, the partial size of salt are not more than the partial size of polytetrafluoroethylene (PTFE), and polytetrafluoroethylene (PTFE) and salt mixed weight ratio are 1 ︰ 0.5~2；
4) cold moudling is carried out to uniformly mixed pellet, molding pressure is 600 ± 50Kg/cm2, product after molding puts
Enter sintering furnace, gradually heat up by the sintering process of polytetrafluoroethylene (PTFE), and is sintered 6~8h under 370 DEG C~380 DEG C environment,
Then cooled to room temperature is taken out in sintering furnace；
5) surfaces externally and internally processing is carried out to the tubing of sinter molding, removal is not less than the surface dense layer of 0.1mm, opens extraction
Take channel；
6) the filtering tubing after processing is put into the water of no less than 4 times own wts, is extracted, until salt is substantially complete
Portion is precipitated.
Step 1) and 2) in, select 0.2~0.9 ㎜ of partial size polytetrafluoroethylene (PTFE) and selection 0.2~0.9 ㎜ salt particle of partial size
Material selects this particle size range to prepare composite sand filtering pipe, is used for sand control and anti-impurity during oil exploitation, and high temperature resistant, resists
Corrosion has high intensity.
Step 1)~3), when being in order to avoid pore-forming, pore throat is too small and vestibule is excessive, and porosity is high but permeability is not high
The phenomenon that, by adjusting the size and different mixing proportion of raw materials particles, meet oil exploitation, fine chemistry industry, environmental protection
Etc. different fields filtering accuracy, adapt to the requirement of different intensity and penetrating power.
It being required according to the filtering accuracy of sand screen, the classified polytetrafluoroethylene (PTFE) of match selection and salt, filtering accuracy is higher,
Select particle smaller；According to sand screen intensity requirement, the mixed proportion of polytetrafluoroethylene (PTFE) and salt is matched, intensity requirement is high, mixing
Ratio is with regard to smaller；It is required according to sand screen penetrating power, matches the mixed proportion of polytetrafluoroethylene (PTFE) and salt, penetrating power requirement
Height, mixed proportion are bigger.
Cold pressing pressure is greatly improved in order to overcome salt resistance of motion in die cavity in step 4).Otherwise, due to pressure
It is not delivered to position, position chaff core among screen pipe is caused, influences intensity and use.
Step 5) carries out surfaces externally and internally processing to the tubing of sinter molding, can choose turnery processing, polishing etc. other add
Work processing method opens extraction channel, is conducive to the precipitation of salt, after salting out, is formed with the reticular structure of penetrating power, improves
Production efficiency, while meeting the structure size of sand screen.
The filtering tubing after processing is put into the water of no less than 4 times own wts in step 6), is extracted when water is enough
Once, it when water is few, can extract repeatedly, the number of extraction is related with the saturation degree of salt in water；Extraction, until salt is basic
It is all precipitated, to accelerate the wash rice of salt to go out, can suitably stir water.After extraction, and the water in filtering tubing is discharged, weighs screen pipe
The weight that material weight should be matched close to polytetrafluoroethylene (PTFE), it can be determined that the substantially all precipitation of salt.
Preferably, in step 1) polytetrafluoroethylene material be pure polytetrafluoroethylene (PTFE), modification polytetrafluoroethylene (PTFE) and compound change
One of the polytetrafluoroethylene (PTFE) of property.The substances such as carbon fiber, graphite are added to be modified polytetrafluoroethylene (PTFE).Polytetrafluoroethylene (PTFE) material
Material have the characteristics that high temperature resistant, it is anticorrosive, it is high lubricate, it is not easy to stick, anti-aging, nontoxic.
Preferably, salt is the salt that high temperature resistant can extract, and also can choose the substance that other high temperature resistants can extract.
Preferably, one of salt NaCl, KCl.
Preferably, it in step 3), is not limited to that partial size is close, but requires the partial size of salt no more than polytetrafluoroethylene (PTFE) partial size,
And guarantee that above two material is uniformly mixed.
Preferably, in step 6), extraction solution is not limited to water, it is also possible to other solvent substitutions.
Technical solution of the present invention, mainly solve traditional polytetrafluoroethylene (PTFE) and when salt prepares pore-forming material (partial size without
Control is crossed, partial size is than being even up to hundreds of times), cause vestibule big, pore throat is small (tens times of ratio or more of pore throat and vestibule), is difficult
Form continuous passage.By this preparation method, the ratio of pore throat and vestibule is 1:2-5, in the mixed proportion of polytetrafluoroethylene (PTFE) and salt
It is taller when permeability level is than conventional method 100:350 when for 100:100, accomplish there is higher infiltration under low porosity
Property.The intensity of filtering material and rigidity are greatly enhanced when low porosity, and application space further expands.Conventional method water
Cooking method removes desalination, and low efficiency is at high cost.This preparation method need to only remove compacted zone, and putting into can be significantly simple except desalting in water
Change technique, saved cost, improves efficiency.
Further, step 1)~6), be also adapted to partial size 0.05~0.2 ㎜ and 0.9~2.0 ㎜ polytetrafluoroethylene (PTFE) and
Salt is prepared into tubing, plate, bar, washer and other shapes of filtering structural material by identical method, is applied to petroleum
Filters etc. under the fields such as chemical industry, fine chemistry industry and environmental protection or hot environment.
The preparation method provided through the invention is prepared and is used for the resistance to of sand control and anti-impurity during a kind of oil exploitation
High-temperature corrosion-resistance high-strength polytetrafluoroethyl-ne composite sand filtering pipe, construction technology of the present invention is simple, and effect is significant.Filtering tubing has
High temperature resistant, anticorrosive, Thief zone, sand control range are wide (can prevent ultra-fine sand, fine sand and medium coarse sand), and sand-blockage ability is strong, at low cost
It the characteristics of honest and clean, long service life, can be widely applied to petroleum recovery operations, there is good social and economic benefit.In addition to system
Standby composite sand filtering pipe, can also prepare plate, bar, washer and other shapes of filtering structural material.It provides through the invention
Preparation method, prepare polytetrafluoroethylene (PTFE) composite sand filtering pipe can also be applied to petroleum practice system, chemical industry chemical production, sewage give up
The fields such as water process and dust-proof Smoke prevention environmental protection.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
Embodiment 1:
(partial size about exists the polytetrafluoroethylene (PTFE) pellet and 35-40 mesh for weighing 30-35 mesh (partial size is about in 0.5-0.6mm)
It each 6000 grams of Nacl pellet 0.4-0.5mm), is uniformly mixed, pours into the mold of Steel material, and in hydraulic press in blender
(molding pressure is in 630Kg/cm for upper cold moudling2).It is removed from the molds product and is put into sintering furnace, by the sintering of polytetrafluoroethylene (PTFE)
Technique gradually heats up, and 380 DEG C at a temperature of sintering 6 hours after, close sintering furnace, product self-heating in sintering furnace is down to room
It is taken out after temperature.Then the turning surfaces externally and internally on lathe, removal are put into and are greater than not less than the compacted zone on the surface of 0.1mm thickness
In the water of 50kg, 24 hours are stood, goes out Nacl sufficiently gradually.Polytetrafluoroethylene (PTFE) sand screen is made.
Polytetrafluoroethylene (PTFE) sand screen pore throat obtained in the present embodiment and vestibule ratio are 1:2-4.It recovers the oil and tries through Shengli Oil Field
Verify bright, sand control precision reaches 0.1mm, does not glue high polymer, and liquid is small by resistance, and oil recovery efficiency is high.
Embodiment 2:
6300 grams of polytetrafluoroethylene (PTFE) pellet of 35-40 mesh (partial size is about in 0.4-0.5mm) are weighed, 40-50 mesh (grain is weighed
Diameter about 0.3-0.4mm) 5700 grams of Nacl pellet, in blender be uniformly mixed, pour into the mold of Steel material, and in liquid
(molding pressure is in 600Kg/cm for cold moudling on press2).It is removed from the molds product and is put into sintering furnace, by polytetrafluoroethylene (PTFE)
Sintering process gradually heats up, and 375 DEG C at a temperature of sintering 7 hours after, close sintering furnace, product is in sintering furnace from heat drop
It is taken out after to room temperature.Then the turning surfaces externally and internally on lathe, the compacted zone on surface of the removal not less than 0.1mm, is put into and is greater than
In the water of 50kg, 24 hours are stood, goes out Nacl sufficiently gradually.Polytetrafluoroethylene (PTFE) sand screen is made.
Polytetrafluoroethylene (PTFE) sand screen pore throat obtained in the present embodiment and vestibule ratio are 1:2-3.It recovers the oil and tries through Shengli Oil Field
Verify bright, sand control precision reaches 0.08mm, does not glue high polymer, and liquid is small by resistance, and oil recovery efficiency is high.
Embodiment 3:
8000 grams of polytetrafluoroethylene (PTFE) pellet of 20-25 mesh (partial size is about in 0.7-0.85mm) are weighed, 25-30 mesh is weighed
4000 grams of Nacl pellet of (partial size about 0.6-0.7mm) are uniformly mixed in blender, pour into the mold of Steel material, and
(molding pressure is in 590Kg/cm for cold moudling on a hydraulic press2).It is removed from the molds product and is put into sintering furnace, by polytetrafluoroethyl-ne
The sintering process of alkene gradually heats up, and 370 DEG C at a temperature of sintering 6.5 hours after, close sintering furnace, product is in sintering furnace
Self-heating is cooled to room temperature taking-up.Then the turning surfaces externally and internally on lathe, the compacted zone on surface of the removal not less than 0.1mm, puts
Enter in the water greater than 50kg, stands 24 hours, go out Nacl sufficiently gradually.Polytetrafluoroethylene (PTFE) sand screen is made.
Polytetrafluoroethylene (PTFE) sand screen obtained in the present embodiment proves through Shengli Oil Field sand control research center ground experiment,
Pore throat and vestibule ratio are 1:2-5, and sand control precision reaches 0.2mm, do not glue high polymer, and liquid is small by resistance.But penetrating power is general,
But intensity and rigidity are higher, but still have special use value.
Embodiment 4:
4000 grams of polytetrafluoroethylene (PTFE) pellet of the carbon fiber modifying of 50-60 mesh (partial size is about in 0.25-0.30mm) are weighed,
8000 grams of Kcl pellet of 60-70 mesh (partial size about 0.2-0.25mm) are weighed, is uniformly mixed in blender, pours into Steel material
Mold in, and (molding pressure is in 580Kg/cm for cold moudling on a hydraulic press2).It is removed from the molds product and is put into sintering
Furnace gradually heats up by the sintering process of polytetrafluoroethylene (PTFE), and 378 DEG C at a temperature of sintering 6 hours after, close sintering furnace, produce
Product self-heating in sintering furnace is cooled to room temperature taking-up.Then the turning surfaces externally and internally on lathe, removal are not less than the surface of 0.1mm
Compacted zone, be put into the water greater than 50kg, stand 24 hours, go out Nacl sufficiently gradually.Polytetrafluoroethylene (PTFE) sand screen is made.
Polytetrafluoroethylene (PTFE) sand screen obtained in the present embodiment proves through Shengli Oil Field sand control research center ground experiment,
Pore throat and vestibule ratio are 1:2-3, and sand control precision reaches 0.08mm, do not glue high polymer, and liquid is small by resistance, intensity and rigidity compared with
Difference, but penetrating power is high, but still there is special use value.
Embodiment 5:
Weigh the polytetrafluoroethylene (PTFE) pellet 200 of the carbon fiber modifying of 100-120 mesh (partial size is about in 0.150-0.124mm)
Gram, each 150 grams of Kcl pellet of 120-150 mesh (partial size about 0.124-0.106mm) are weighed, are uniformly mixed in blender,
Enter in the mold of Steel material, and (molding pressure is in 560Kg/cm for cold moudling on a hydraulic press2).Product is removed from the molds to put
Enter sintering furnace, gradually heat up by the sintering process of polytetrafluoroethylene (PTFE), and 375 ± 2 DEG C at a temperature of be sintered about 6 hours after,
Sintering furnace is closed, product self-heating in sintering furnace is cooled to room temperature taking-up.Then the turning surfaces externally and internally on lathe removes surface
Compacted zone, be put into the water greater than 5kg, stand 24 hours, go out Nacl sufficiently gradually, polytetrafluoroethylene (PTFE) cylinder bar.
Polytetrafluoroethylene (PTFE) cylinder bar obtained in the present embodiment is demonstrate,proved through Shengli Oil Field sand control research center ground experiment
Bright, pore throat and vestibule ratio are 1:2-3, and filtering accuracy reaches 0.02mm, do not glue high polymer, and liquid is small by resistance, and penetrating power is high,
It can be applied to the Filters etc. under the fields such as petrochemical industry, fine chemistry industry and environmental protection or hot environment.
By this preparation method, tested through Shengli Oil Field engineering and technological research barnyard face and down-hole oil production, poly- the four of preparation
Vinyl fluoride composite sand filtering pipe properties are better than traditional gravel sand screen (see the table below) comprehensively.
The present invention can manufacture the filtering sandpipe of the sand controls precision such as 0.08mm, 0.1mm, 0.2mm, meet target requirement.This
Invention makes full use of polytetrafluoroethylene (PTFE) comprehensive performance advantage, has high temperature resistant, anticorrosive, high lubrication, not easy to stick, anti-aging, nothing
The features such as poison is harmless, mainly solves the craftsmanship of the high permeability and pore-forming under the low hole of polytetrafluoroethylene (PTFE), overcomes biography
The water-boiling method of system desalts pore-forming, preferably has matched the unification of the size in hole, the distributing homogeneity in hole and sand control precision, ensure that
Intensity and dimensional stability problems under high permeability.
Claims (4)
1. a kind of preparation method of polytetrafluoroethylene (PTFE) composite sand filtering pipe, which is characterized in that specific step is as follows:
1) polytetrafluoroethylene material selects the polytetrafluoroethylene (PTFE) of 0.2~0.9 ㎜ of partial size to be sieved, by material similar in partial size
Carry out differentiated control, spare；
2) salt selects 0.2~0.9 ㎜ salt particle material of partial size to be sieved, by the progress differentiated control, standby of material similar in partial size
With；
3) according to the requirement of the filtering accuracy of sand screen, intensity and penetrating power, the classified polytetrafluoroethylene (PTFE) of match selection and
Salt, the partial size of salt are not more than the partial size of polytetrafluoroethylene (PTFE), and polytetrafluoroethylene (PTFE) and salt mixed weight ratio are 1 ︰ 0.5~2；
4) cold moudling is carried out to uniformly mixed pellet, molding pressure is 600 ± 50Kg/cm2, product after molding is put into burning
Freezing of a furnace gradually heats up by the sintering process of polytetrafluoroethylene (PTFE), and is sintered 6~8h under 370 DEG C~380 DEG C environment, then
Cooled to room temperature is taken out in sintering furnace；
5) surfaces externally and internally processing is carried out to the tubing of sinter molding, removal is not less than the surface dense layer of 0.1mm, and it is logical to open extraction
Road；
6) the filtering tubing after processing is put into the water of no less than 4 times own wts, is extracted, until the substantially all analysis of salt
Out.
2. a kind of preparation method of polytetrafluoroethylene (PTFE) composite sand filtering pipe according to claim 1, which is characterized in that step 1)
Middle polytetrafluoroethylene material be pure polytetrafluoroethylene (PTFE), modification polytetrafluoroethylene (PTFE) and composite modified polytetrafluoroethylene (PTFE) in one
Kind.
3. a kind of preparation method of polytetrafluoroethylene (PTFE) composite sand filtering pipe according to claim 1, which is characterized in that step 2)
Middle salt is the salt that high temperature resistant can extract.
4. a kind of preparation method of polytetrafluoroethylene (PTFE) composite sand filtering pipe according to claim 3, which is characterized in that salt is
One of NaCl, KCl.
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| GB792012A (en) * | 1953-12-10 | 1958-03-19 | Us Gasket Company | Cementable polytetrafluoroethylene and the method of making articles thereof cementable |
| GB1592517A (en) * | 1977-03-11 | 1981-07-08 | Buerkert Gmbh | Seal of polytetrafluoroethylene |
| CN201025009Y (en) * | 2007-04-28 | 2008-02-20 | 张国军 | Three prevention tool |
| CN105169966A (en) * | 2015-07-14 | 2015-12-23 | 江苏泰氟隆科技有限公司 | Polytetrafluoroethylene three-dimensional microporous membrane and preparation method thereof |
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