CN106947449A - A kind of shielding diverting agent and preparation method thereof, application method - Google Patents
A kind of shielding diverting agent and preparation method thereof, application method Download PDFInfo
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- CN106947449A CN106947449A CN201710170063.5A CN201710170063A CN106947449A CN 106947449 A CN106947449 A CN 106947449A CN 201710170063 A CN201710170063 A CN 201710170063A CN 106947449 A CN106947449 A CN 106947449A
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
- C08F265/10—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of amides or imides
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Abstract
The invention provides a kind of shielding diverting agent and preparation method thereof, application method, belong to oil well reagent technique field, shielding diverting agent is made by the raw material of following mass fraction：High molecular polymer 30%~50%, heat stabilizer 10%~20%, proppant 10%~40%, fluid loss additive 10%~20% and initiator 10%~20%；And disclose preparation method.Beneficial effects of the present invention are：Plugging strength is high, and sealing ratiod is more than 95% under 20Mpa；Liquid need not be matched somebody with somebody, operation timeliness can be improved；Well-flushing can reduce the formation blockage pollution that lost circulation is caused；The agent is easy to come off under opposite force effect, and the particle split away off is easy to be carried away by the liquid flowed；Resume permeability rate >=95%；Compatibility is strong, and clear water, bittern, oil field purification sewage can be used as carrying medium.
Description
Technical field
The present invention relates to oil well reagent technique field, more particularly to a kind of shielding diverting agent and preparation method thereof, user
Method.
Background technology
As oil field long period of development is produced, ground layer original dynamic equilibrium is seriously damaged, oil well in process of production, sand
Oil reservoir, holddown, oil well stopping production phenomenon is buried to happen occasionally.Oil well sand washing, well-flushing are one of conventional operation means of oil field production, especially
That oil field development enters the middle and later periods, oil well production time length, voidage-injection imbalance, formation depletion leakage are serious, cementing strength by
Heavy damage, well killing fluid only import but no export, it is impossible to set up normal circulation, sand washing, well-flushing work can not be carried out, and seriously perplex oil field
Normal production.Fracturing fluid leaks into oil reservoir, causes pore plugging, pollutes oil reservoir, causes oil well output to reduce.
The content of the invention
It is an object of the invention to provide a kind of shielding diverting agent and preparation method thereof, application method.
For achieving the above object, the present invention is realized by following measure：A kind of shielding diverting agent, the shielding
Diverting agent is made by the raw material of following mass fraction：High molecular polymer 30%~50%, heat stabilizer 10%~20%, support
Agent 10%~40%, fluid loss additive 10%~20% and initiator 10%~20%.
Wherein, high molecular polymer is hydrolyzed polyacrylamide and polyacrylamide sylvite according to 1:0.5-1 mass parts
Number ratio is mixed.
Wherein, the heat stabilizer is the mixture of the methyl propane sulfonic acid of 2- acrylamidos -2, sodium thiosulfate and formaldehyde,
Their quality parts ratio is 1:0.3-0.5:0.5-1.
Wherein, the proppant is formulated by 55-70% bentonites, 15-20% calcium carbonate and 10-30% calcium oxide.
Wherein, the fluid loss additive by low-viscosity sodium carboxymethyl cellulose salt and hydrolyzed polyacrylonitrile ammonium salt according to 1:0.5-
1 mass ratio mixing.
Wherein, the initiator is that potassium peroxydisulfate, sodium hydrogensulfite and potassium chloride press 1:1-1.5:7-10 mass ratio is matched somebody with somebody
System.
In addition, present invention also offers the preparation method of the shielding diverting agent, wherein, its preparation method includes following step
Suddenly：
The first step, by high molecular polymer in material-compound tank with sodium carbonate adjust pH value 9-10, adjust high molecular polymer
Concentration is to 25%~30%；
Second step, the first step is handled after high molecular polymer be delivered to polymeric kettle, according to proportioning add initiator, heat
Stabilizer, proppant and fluid loss additive, are heated to 55-60 DEG C, carry out polymerisation 4.5-5h, obtain brown colorful rubber sheet；
3rd step, the brown colorful rubber sheet for obtaining second step are through granulator granulation；
Drying box is delivered in 4th step, the granulation for obtaining the 3rd step, and drying is heated at 65-70 DEG C；
5th step, the 4th dried particle of step crushed, obtain particle, that is, obtain shielding diverting agent.
Wherein, the particle that the 5th step is obtained, 0.1~1.0mm of particle diameter accounts for more than 80%.
The application method of shielding diverting agent, the solution that shielding diverting agent addition clear water is configured into 1%~2% is used.
Beneficial effects of the present invention are：Elasticity of the invention is big, chance water is insoluble, deforms under external force and removes external force
It can restore to the original state, the agent has unidirectional plugging action well to imbibition and the serious stratum of leakage, is mainly used in sand washing, well-flushing etc.
Temporarily stifled, leakproof in operation process；The agent has unidirectional plugging action well to imbibition and the serious stratum of leakage, is washed with conventional
Well agent technology is compared, the technology has temporarily that stifled success rate is high, small to reservoir injury, onsite application is convenient, reduce with liquid wait and
The features such as improving sand washing efficiency, is particularly suitable for use in long well section, multilayer position lost-circulation zone continuous sand flushing well-flushing；Plugging strength is high,
Sealing ratiod is more than 95% under 20Mpa；Liquid need not be matched somebody with somebody, operation timeliness can be improved；Well-flushing can reduce the ground that lost circulation is caused
Layer blocking pollution；The agent is easy to come off under opposite force effect, and the liquid that the particle split away off is easy to be flowed is carried out
Go；Resume permeability rate >=95%；Compatibility is strong, and clear water, bittern, oil field purification sewage can be used as carrying medium.
Brief description of the drawings
Fig. 1 is expansion multiple curve of the shielding diverting agent in running water.
Fig. 2 is expansion multiple of the shielding diverting agent in salinity is 100000mg/L stratum water.
Fig. 3 blocks pressure test to cover diverting agent.
Fig. 4 is permeability decrease curve after closure.
Fig. 5 is to inject pressure history after blocking.
Fig. 6 is resume permeability curve after rinsing.
Fig. 7 declines change curve for injection pressure after rinsing.
Fig. 8 is the relation of elastic granule particle diameter and elastic modelling quantity.
Fig. 9 is the heat resistance of elastic granule.
Figure 10 opens for well-flushing takes out rear effect.
Embodiment
For achieving the above object, the present invention is realized by following measure：A kind of shielding diverting agent, the shielding
Diverting agent is made by the raw material of following mass fraction：High molecular polymer 30%~50%, heat stabilizer 10%~20%, support
Agent 10%~40%, fluid loss additive 10%~20% and initiator 10%~20%.
Wherein, high molecular polymer is hydrolyzed polyacrylamide and polyacrylamide sylvite according to 1:0.5-1 mass parts
Number ratio is mixed.
Wherein, the heat stabilizer is the mixture of the methyl propane sulfonic acid of 2- acrylamidos -2, sodium thiosulfate and formaldehyde,
Their quality parts ratio is 1:0.3-0.5:0.5-1.
Wherein, the proppant is formulated by 55-70% bentonites, 15-20% calcium carbonate and 10-30% calcium oxide.
Wherein, the fluid loss additive by low-viscosity sodium carboxymethyl cellulose salt and hydrolyzed polyacrylonitrile ammonium salt according to 1:0.5-
1 mass ratio mixing.
Wherein, the initiator is that potassium peroxydisulfate, sodium hydrogensulfite and potassium chloride press 1:1-1.5:7-10 mass ratio is matched somebody with somebody
System.
In addition, present invention also offers the preparation method of the shielding diverting agent, wherein, its preparation method includes following step
Suddenly：
The first step, by high molecular polymer in material-compound tank with sodium carbonate adjust pH value 9-10, adjust high molecular polymer
Concentration is to 25%~30%；
Second step, the first step is handled after high molecular polymer be delivered to polymeric kettle, according to proportioning add initiator, heat
Stabilizer, proppant and fluid loss additive, are heated to 55-60 DEG C, carry out polymerisation 4.5-5h, obtain brown colorful rubber sheet；
3rd step, the brown colorful rubber sheet for obtaining second step are through granulator granulation；
Drying box is delivered in 4th step, the granulation for obtaining the 3rd step, and drying is heated at 65-70 DEG C；
5th step, the 4th dried particle of step crushed, obtain particle, that is, obtain shielding diverting agent.
Wherein, the particle that the 5th step is obtained, 0.1~1.0mm of particle diameter accounts for more than 80%.
First, technical indicator
The technical indicator of shielding diverting agent is as follows：
2nd, experimental section：
1st, shielding diverting agent water insoluble matter content is tested
A certain amount of shielding diverting agent is weighed, is fully dissolved in running water, centrifugation drying is weighed, final water-insoluble
Content is 2.75%.
Experimental data shows that the shielding diverting agent water insoluble matter content is relatively low, is significantly less than current other and temporarily blocks up liquid water not
Molten thing residue content, does not interfere with shielding temporarily stifled construction effect.
2nd, shielding diverting agent surface-active is tested
A certain amount of shielding diverting agent is weighed, is fully dissolved in running water, uniform solution is obtained, is hung with JAhyl -180
It is 40mN/M that ring type interfacial tensimeter, which determines surface tension,.
Experimental data shows that the diverting agent aqueous solution has certain surface-active, is conducive to the row of returning after temporarily stifled construction.
3rd, shielding diverting agent Bulking Time and expansion multiple experiment
The water swelling of diverting agent is as caused by its special molecular structure.Under a certain pressure may be used after diverting agent expansion
To occur elastic deformation, it is resident in leakage stratum or fracture pore, pressure difference increase, which can be reduced, shakes out and output water.Diverting agent
Expansion multiple and time be a kind of logarithmic relationship within the specific limits, start than very fast, then gradually slow, it is existing that test objective, which is,
Field construction provides parameter designing foundation.
Test method:Shielding diverting agent sample 1.0g~3.0g of the present invention is weighed with electronic balance, sample is placed on
Range is extremely full of cylinder scale in 100mL clean graduated cylinder, to add water (running water or stratum water).Graduated cylinder is placed in setting temperature
In the water-bath of degree or electrically heated drying cabinet, at regular intervals, graduated cylinder is taken out, material therein is poured into standard screen, filtered off after water,
Weigh the quality after shielding diverting agent expansion.Weighing is finished, and is filtered off liquid and hydroexpanding body refunds graduated cylinder, continue constant temperature.Press
Formula calculates expansion multiple.
P=Mi/M (1)
In formula：P- expansion multiples；
The hydroexpanding body quality that Mi- iths are weighed, g；
M- sample qualities, g.
Result of the test
Table 1 is by shielding diverting agent expansion multiple with three groups of fine grain shielding diverting agents and three groups of coarse grain footpath shielding diverting agents
The method of experiment, is dissolved in running water and contrasting；
Table 2 is to be dissolved in salinity 100000mg/L stratum in normal temperature, 90 DEG C and 120 DEG C with three groups of fine grain shielding diverting agents
The contrast of the coefficient of expansion and three groups of coarse grain footpath shielding diverting agents expansion multiple in same temperature, salinity stratum water in water.
Carefully refer to that 0.1~1.0mm of particle diameter particle accounts for the 80% of component；Slightly refer to that 3~5mm of particle diameter particle accounts for group
80% divided.
(1) shielding diverting agent expansion test in running water the results are shown in Table 1, Fig. 1.
Expansion multiple of the shielding diverting agent of table 1 in running water
(2) expansion test of the shielding diverting agent in salinity is 100000mg/L stratum water the results are shown in Table 2, Fig. 2.
Table 2
Conclusion (of pressure testing)：A. shielding diverting agent reduces with the increase expansion multiple of salinity.B. shielding diverting agent is met after water
Expansion is very fast, and later speed of expansion slows down；10h or so is placed, it is basic inflatable complete.C. soaking temperature is raised, speed of expansion
Accelerate, expansion multiple increase.The final swelling volume of identical quality sample is close.And under the conditions of of the same race, particle diameter 0.1~
1.0mm accounts for 80% fine grained of component, and expansion multiple is higher than 80% coarse granule that 3~5mm of particle diameter accounts for component.
4th, shielding diverting agent disperses suspension experiment
The scattered suspension of shielding diverting agent is the key factor for ensureing construction safety, by normal construction discharge capacity, is pumped into stifled
Agent about needs 1h from well head to shaft bottom, adds the time of preparation, and the blocking agent to shaft bottom is substantially all to be swelled.Suspended dispersed experiment
Purpose seeks to ensure that shielding diverting agent still keeps good mobility, blocking agent is smoothly injected leakage stratum, it is to avoid blocking agent
Deposit to shaft bottom or block oil pipe, cause construction accident.
By the sample that particle diameter is 0.5mm~5mm, clear water is configured to 1%~2% suspension, is 150 with mixing speed
Turn/stirring of min agitator when, dispersive property preferably, and the swollen rear suspension increase of water.By the sample that particle diameter is 2.0mm~3.0mm
Product, be configured to 1%~2% suspension, with mixing speed for 200 turns/min agitator stir when, can be allowed to be uniformly dispersed.
Experiment shows, when shielding diverting agent mass concentration is less than 2%, suspends and good flowing properties, and concentration flows when being more than 2%
Dynamic performance starts to be deteriorated, and concentration loses flowability when reaching 3%.Therefore, during site operation, the compound concentration of shielding diverting agent is not
It preferably more than 2%, otherwise will be lost flowability in oil pipe, block oil pipe, cause construction to fail.
5th, the dissolving water test of shielding diverting agent
Take shielding diverting agent to be fully swelled with clear water, be divided into two parts, portion is placed in the sealing test tube under the conditions of 85 DEG C, separately
Portion is put into special test tube, is placed in 120 DEG C of baking ovens, and special test tube is opened every the obstructed time, observation investigated through high temperature after
The form of grain, the muddy degree of special test tube reclaimed water observes the elasticity and intensity of diverting agent.Result of the test, is shown in Table 3.
The dissolving water test of the shielding diverting agent of table 3
Experiment shows that form is varied from shielding diverting agent particle at a certain temperature, is contrasted with the sample under normal temperature, glue
Body intensity diminishes, and grain diameter reduces, and dispersiveness is strong.
6th, shielding diverting agent closure pressure test
Diverting agent goes out to lost-circulation zone when blocking, and the rising of operation pressure is demonstrated by temporarily blocking up shut-off capacity；Carry out indoors
Rock core Logistics automatic system, result of the test is shown in Fig. 3, and laboratory test shows：Shielding diverting agent is particle blocking agent, rear pressure stifled to plugged zone
Front end is acted predominantly on, and rises rapid, the suitable closure near wellbore zone deficit of diverting agent particle, deep position is not easily accessible；Note
The rising for entering pressure is an important indicator for weighing diverting agent performance, determines the closure pressure of diverting agent.
7th, shielding diverting agent is water-fast with permeability variation performance test
(1) test method step
Survey rock core water phase permeability；Survey rock pore volume；Displacing fluid is squeezed, stifled preceding core permeability is surveyed；
Displacing fluid is squeezed, core permeability after surveying breakthrough pressure and being stifled.Draw curve.
(2) result of the test
Shielding diverting agent simulated formation situation under the conditions of 85 DEG C, the pore volume of rock core, permeability, are blocked up before measurement is temporarily stifled
The situation of change of pressure and permeability afterwards.Test data is shown in Table 4, Fig. 4, Fig. 5.
Pressure, permeability test data after table 4 is temporarily stifled
Knowable to table 4 and Fig. 4, Fig. 5 Dependence Results, shielding diverting agent with can effectively reducing nearly well after being blocked to lost-circulation zone
The permeability of band, injection pressure can be effectively improved with the increase of injected water volume, it is established that the artificial shielding of higher-strength is temporarily blocked up
Layer, so as to eliminate or reduce to formation leakage problem.
8th, shielding diverting agent reversely surveys resume permeability performance test
(1) test method step
A. rock core water phase permeability is surveyed；Survey rock pore volume；
B. diverting agent is squeezed to rock core, in 80 DEG C of constant temperature 12-15 hours；
C. displacing fluid is squeezed, stifled rear reversely core permeability is surveyed.
D. the water-fastness value of diverting agent is calculated；Draw curve.
(2) result of the test
Shielding diverting agent simulated formation situation under the conditions of 85 DEG C, it is 30.5% to determine the pore volume before rock core is temporarily blocked up,
Water phase permeability is：2985.21um2.The situation of change of pressure and permeability after measurement is temporarily stifled.Test data is shown in Table 5, Fig. 6, figure
7。
Reversely rock core recovers test data after table 5 is stifled
From table 5 and Fig. 6, Fig. 7 Dependence Results, shielding diverting agent removes diverting agent reverse after being blocked to lost-circulation zone
Water is injected, experiment, which illustrates that releasing is temporarily stifled, can effectively recover the permeability of near wellbore zone, and inject pressure with the increase of injected water volume
Power can be reduced effectively, it is established that well-flushing is circulated, so that eliminate or reduce to formation leakage problem, and after voluntarily blocking is released,
Shorten drainage period, effective formation protection returns to normal production.
9th, shielding diverting agent compressive resistance is tested
A certain amount of shielding diverting agent is equably laid on to the crushing chamber of forcing press, applies pressure, at various pressures,
Its percentage of damage is measured, its compressive resistance is judged according to broken kernel size, experimental result is shown in Table 6.
The shielding diverting agent compressive resistance data of table 6
| Pressure (MPa) | 5 | 8 | 11 | 14 | 17 | 20 |
| Percentage of damage (%) | 0 | 0.1 | 0.4 | 1.2 | 4.8 | 7.5 |
Experimental data shows that shielding diverting agent percentage of damage under 20MPa is still very low, can meet and temporarily block up the pressure-resistant of process
It is required that.The experimental data of table 6 shows that shielding diverting agent is up to 99.7% to core sealing ratiod, and breakthrough pressure gradient is up to
1.08MPa/cm, can meet stifled borehole requirement.
10th, influence (be shown in Table 7 and Fig. 8) of the particle diameter of shielding diverting agent elastic granule to elastic modelling quantity
The particle diameter of the elastic granule of table 7 and the relation of elastic modelling quantity
11st, the temperature tolerance of shielding diverting agent elastic granule
The temperature tolerance of the elastic granule of table 8
| Temperature (DEG C) | Elastic modelling quantity (Pa) |
| 20 | 3165 |
| 40 | 2063 |
| 60 | 1540 |
| 70 | 1372 |
| 80 | 1813 |
| 85 | 1766 |
3rd, usage and dosage
1st, according to oily (gas) well data, flushing well agent usage amount V is first calculated
V=π D2 (H+50)
V-- diverting agents solution usage, m3 in formula
D-- production casing internal diameters, m
H-- artificials bottom of a well are to the height penetrated at the top of layers apart, m
2nd, the agent is poured into pond, be pumped into pump truck from oil pipe, followed by being pumped into well killing fluid.
4th, live applicable cases
1st, the application in gram gas field is strangled in Turkmenistan Saudi Arabia
The gas field is gone into operation at the beginning of the end of the sixties 70, repaiies preceding reservoir pressure coefficient 0.15-0.3, belongs to subnormal pressure gas well, nothing
Method sets up circulation.Well workover team of Ukraine has repaiied a bite well with six months, but because leakage is serious, takes a variety of induced flow and arrange
Apply and be showed no effect, fail to go into operation so far.Middle side has only been used using this technology just reaches reparation purpose for 30 days, and average product
Recover more than 85%, reached that subnormal pressure well repairs advanced international standard (not taking well stimulation).This technology should
With being that the important foundation that succeeds of gram gas field well workover is strangled by Saudi Arabia, up to the present 86 mouthfuls of well workover, success rate 100% altogether.(in detail
9) data are shown in Table
Table 9
2nd, enter scene application in Shengli Oil Field Zhongyuan Oil Field, work well.
Construction well example：Triumph oil development QD5-2-X18 wells
(1) well-flushing condition of construction, is shielded：
September in 2016 19 days is because of oily thick, wax deposition implementing plan well-flushing, production layer position：1 on two times 3-4 tri-；Well section：
1653.6-1713.9.6m, 26.9m/7 layers of artificial bottom of a well 1866m, pump is deep：1206.93m, screen casing depth：1217.73m, hydrodynamic
Face is temporarily stifled using shielding before 808m, well-flushing, when flushing fluid uses 14m3 (oil jacket annular space volume 13.4m3), has started to press, pump
Press by 0 ↗ 8MPa, cementing truck discharge capacity third gear (about 16m3/h), oil pipe returns liquid, it is established that circulation continuation is replaced into flushing fluid 11m3, is washed
Well pressure is 8MPa, adds up shared flushing fluid 25m3.Well-flushing, which is opened, to be taken out rear effect and see the table below 10, Figure 10.
The QD5-2-X18 well well washing effect statistical forms of table 10
For the technical characterstic for illustrating this programme can be understood, below by embodiment, this programme is illustrated.
Embodiment 1
The present invention is a kind of shielding diverting agent, and shielding diverting agent is made by the raw material of following mass fraction：High molecular polymerization
Thing 30%, heat stabilizer 20%, proppant 30%, fluid loss additive 10% and initiator 10%.
Wherein, high molecular polymer is hydrolyzed polyacrylamide and polyacrylamide sylvite according to 1:1 quality parts ratio
Mix.
Wherein, heat stabilizer is the mixture of the methyl propane sulfonic acid of 2- acrylamidos -2, sodium thiosulfate and formaldehyde, they
Quality parts ratio be 1:0.5:0.5.
Wherein, proppant is formulated by 55% bentonite, 20% calcium carbonate and 25% calcium oxide.
Wherein, fluid loss additive by low-viscosity sodium carboxymethyl cellulose salt and hydrolyzed polyacrylonitrile ammonium salt according to 1:1 quality
Than mixing.
Wherein, initiator is that potassium peroxydisulfate, sodium hydrogensulfite and potassium chloride press 1:1:10 mass ratio is prepared.
Preparation method comprises the following steps：
The first step, by high molecular polymer in material-compound tank with sodium carbonate adjust pH value 9-10, adjust high molecular polymer
Concentration is to 25%；
Second step, the first step is handled after high molecular polymer be delivered to polymeric kettle, according to proportioning add initiator, heat
Stabilizer, proppant and fluid loss additive, are heated to 60 DEG C, carry out polymerisation 5h, obtain brown colorful rubber sheet；
3rd step, the brown colorful rubber sheet for obtaining second step are through granulator granulation；
Drying box is delivered in 4th step, the granulation for obtaining the 3rd step, and drying is heated at 70 DEG C；
5th step, the 4th dried particle of step crushed, obtain particle, that is, obtain shielding diverting agent.
Wherein, the particle that the 5th step is obtained, 0.1~1.0mm of particle diameter accounts for 85%.
Embodiment 2
The present invention is a kind of shielding diverting agent, and shielding diverting agent is made by the raw material of following mass fraction：High molecular polymerization
Thing 40%, heat stabilizer 12%, proppant 20%, fluid loss additive 15% and initiator 13%.
Wherein, high molecular polymer is hydrolyzed polyacrylamide and polyacrylamide sylvite according to 1:0.5 mass fraction
Than mixing.
Wherein, heat stabilizer is the mixture of the methyl propane sulfonic acid of 2- acrylamidos -2, sodium thiosulfate and formaldehyde, they
Quality parts ratio be 1:0.5:1.
Wherein, proppant is formulated by 60% bentonite, 20% calcium carbonate and 20% calcium oxide.
Wherein, fluid loss additive by low-viscosity sodium carboxymethyl cellulose salt and hydrolyzed polyacrylonitrile ammonium salt according to 1:0.5 matter
Amount is than mixing.
Wherein, initiator is that potassium peroxydisulfate, sodium hydrogensulfite and potassium chloride press 1:1.5:10 mass ratio is prepared.
In addition, present invention also offers the preparation method of the shielding diverting agent, wherein, its preparation method includes following step
Suddenly：
The first step, by high molecular polymer in material-compound tank with sodium carbonate adjust pH value 9-10, adjust high molecular polymer
Concentration is to 30%；
Second step, the first step is handled after high molecular polymer be delivered to polymeric kettle, according to proportioning add initiator, heat
Stabilizer, proppant and fluid loss additive, are heated to 60 DEG C, carry out polymerisation 5h, obtain brown colorful rubber sheet；
3rd step, the brown colorful rubber sheet for obtaining second step are through granulator granulation；
Drying box is delivered in 4th step, the granulation for obtaining the 3rd step, and drying is heated at 70 DEG C；
5th step, the 4th dried particle of step crushed, obtain particle, that is, obtain shielding diverting agent.
Wherein, the particle that the 5th step is obtained, 0.1~1.0mm of particle diameter accounts for 90%.
Embodiment 3
The present invention is a kind of shielding diverting agent, and the shielding diverting agent is made by the raw material of following mass fraction：Macromolecule
Polymer 49%, heat stabilizer 10%, proppant 15%, fluid loss additive 15% and initiator 11%.
Wherein, high molecular polymer is hydrolyzed polyacrylamide and polyacrylamide sylvite according to 1:1 quality parts ratio
Mix.
Wherein, the heat stabilizer is the mixture of the methyl propane sulfonic acid of 2- acrylamidos -2, sodium thiosulfate and formaldehyde,
Their quality parts ratio is 1:0.5:1.
Wherein, the proppant is formulated by 67% bentonite, 16.5% calcium carbonate and 16.5% calcium oxide.
Wherein, the fluid loss additive by low-viscosity sodium carboxymethyl cellulose salt and hydrolyzed polyacrylonitrile ammonium salt according to 1:1
Mass ratio is mixed.
Wherein, the initiator is that potassium peroxydisulfate, sodium hydrogensulfite and potassium chloride press 1:1:10 mass ratio is prepared.
In addition, present invention also offers the preparation method of the shielding diverting agent, wherein, its preparation method includes following step
Suddenly：
The first step, by high molecular polymer in material-compound tank with sodium carbonate adjust pH value 9-10, adjust high molecular polymer
Concentration is to 28%；
Second step, the first step is handled after high molecular polymer be delivered to polymeric kettle, according to proportioning add initiator, heat
Stabilizer, proppant and fluid loss additive, are heated to 60 DEG C, carry out polymerisation 5h, obtain brown colorful rubber sheet；
3rd step, the brown colorful rubber sheet for obtaining second step are through granulator granulation；
Drying box is delivered in 4th step, the granulation for obtaining the 3rd step, and drying is heated at 70 DEG C；
5th step, the 4th dried particle of step crushed, obtain particle, that is, obtain shielding diverting agent.
Wherein, the particle that the 5th step is obtained, 0.1~1.0mm of particle diameter accounts for 95%.
Technical characteristic of the invention without description can be realized by or using prior art, will not be repeated here, certainly,
Described above is not limitation of the present invention, and the present invention is also not limited to the example above, the ordinary skill of the art
Change, remodeling, addition or replacement that personnel are made in the essential scope of the present invention, should also belong to the protection model of the present invention
Enclose.
Claims (10)
1. a kind of shielding diverting agent, it is characterised in that the shielding diverting agent is made by the raw material of following mass fraction：Macromolecule
Polymer 30%~50%, heat stabilizer 10%~20%, proppant 10%~40%, fluid loss additive 10%~20% and initiator 10%~
20%。
2. shielding diverting agent according to claim 1, it is characterised in that high molecular polymer be hydrolyzed polyacrylamide and
Polyacrylamide sylvite is according to 1:0.5-1 quality parts ratio is mixed.
3. shielding diverting agent according to claim 1, it is characterised in that the heat stabilizer is the first of 2- acrylamidos -2
The mixture of base propane sulfonic acid, sodium thiosulfate and formaldehyde, their quality parts ratio is 1:0.3-0.5:0.5-1.
4. shielding diverting agent according to claim 1, it is characterised in that the proppant is by 55-70% bentonites, 15-
20% calcium carbonate and 10-30% calcium oxide are formulated.
5. shielding diverting agent according to claim 1, it is characterised in that the fluid loss additive is by low-viscosity carboxymethyl fiber
Plain sodium salt and hydrolyzed polyacrylonitrile ammonium salt is according to 1:0.5-1 mass ratio mixing.
6. shielding diverting agent according to claim 1, it is characterised in that the initiator is potassium peroxydisulfate, bisulfite
Sodium and potassium chloride press 1:1-1.5:7-10 mass ratio is prepared.
7. the shielding diverting agent according to claim any one of 1-6, it is characterised in that its preparation method includes following step
Suddenly：
The first step, by high molecular polymer in material-compound tank with sodium carbonate adjust pH value 9-10, adjust high molecular polymer concentration
To 25%~30%；
Second step, the first step is handled after high molecular polymer be delivered to polymeric kettle, add initiator, thermally-stabilised according to proportioning
Agent, proppant and fluid loss additive, are heated to 55-60 DEG C, carry out polymerisation 4.5-5h, obtain brown colorful rubber sheet；
3rd step, the brown colorful rubber sheet for obtaining second step are through granulator granulation；
Drying box is delivered in 4th step, the granulation for obtaining the 3rd step, and drying is heated at 65-70 DEG C；
5th step, the 4th dried particle of step crushed, obtain particle, that is, obtain shielding diverting agent.
8. shielding diverting agent according to claim 7, it is characterised in that the particle that the 5th step is obtained, particle diameter 0.1~
1.0mm accounts for more than 80%.
9. a kind of preparation method of shielding diverting agent according to claim any one of 1-6, it is characterised in that its preparation side
Method comprises the following steps：
The first step, by high molecular polymer in material-compound tank with sodium carbonate adjust pH value 9-10, adjust high molecular polymer concentration
To 25%~30%；
Second step, the first step is handled after high molecular polymer be delivered to polymeric kettle, add initiator, thermally-stabilised according to proportioning
Agent, proppant and fluid loss additive, are heated to 55-60 DEG C, carry out polymerisation 4.5-5h, obtain brown colorful rubber sheet；
3rd step, the brown colorful rubber sheet for obtaining second step are through granulator granulation；
Drying box is delivered in 4th step, the granulation for obtaining the 3rd step, and drying is heated at 65-70 DEG C；
5th step, the 4th dried particle of step crushed, obtain particle, that is, obtain shielding diverting agent.
10. the application method of a kind of shielding diverting agent according to claim any one of 1-9, it is characterised in that will shield
The solution that diverting agent addition clear water is configured to 1%~2% is used.
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