CN104212421B - It is a kind of to block the anti-gas cut agent in crack and preparation method with brill - Google Patents
It is a kind of to block the anti-gas cut agent in crack and preparation method with brill Download PDFInfo
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- CN104212421B CN104212421B CN201310220185.2A CN201310220185A CN104212421B CN 104212421 B CN104212421 B CN 104212421B CN 201310220185 A CN201310220185 A CN 201310220185A CN 104212421 B CN104212421 B CN 104212421B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/493—Additives for reducing or preventing gas migration
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
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Abstract
The present invention relates to one kind with brill closure anti-gas cut agent in crack and preparation method thereof；This is with boring polyethylene glycol of the closure anti-gas cut agent in crack by 10.0 15.2 parts of mass fraction, 14.0 25.5 parts of maleic anhydride, 14.5 25.5 parts of trimethylolpropane allyl ether, 0.2 0.5 parts of bentonite in powder, 30 35 parts of calcium carbonate superfine powder powder, 3.0 5.0 parts of cotton fiber composition；It is provided by the invention effectively to block gas-bearing fracture with the brill closure anti-gas cut agent of microcrack, during 1~5% dosage, drilling well liquid-based wastage of the slurry in microcrack can be made to be reduced to 6ml from 500ml, sealing ratiod is up to 98.8%, and plugged zone is reversely 3.5KPa by the bearing capacity of gas penetration in microcrack.
Description
Technical field
It is more particularly to a kind of with the anti-gas cut agent in brill closure crack and preparation side the invention belongs to petroleum drilling technology field
Method.
Background technology
In oil and gas Fractured Gas Reservoir straight well or directional well drilling, the gas in gas reservoir crack is frequently encountered
（Natural gas, hydrogen sulfide, carbon dioxide）By splitting under gas-liquid metathesis inside the metathesis of pit shaft gravity or crack
In seam intrusion pit shaft, local decompression gas cut is produced, causes overflow, seriously affect drillng operation and surface personnel
Safety.Found in actual well drilled, obvious leakage does not occur for gas cut well section, shows crack openings size and little, if opening
Size is big, and obvious leakage occurs, it will the mode that taking reduces density or plugging operations is handled in time.Just because of
This indiscoverable underground is not leaked or micro- leakage, causes in the intrusion pit shaft of gas bit by bit, a small amount of gas is difficult by well
Lower pressure control device systems detect discovery in time, cause gas cut finally to produce larger volume expansion from less to more and trigger serious overflow
Flow well kick.Therefore, the gas-liquid metathesis inside the metathesis of positive balance well-sinking gravity or crack is that local decompression occurs
The inducement of gas cut, and the fissure channel that gas invades from stratum to pit shaft be then the unique channel of gas cut, it is necessary in drilling well and
When closure block, the present invention be based on this and put forward.
Laboratory simulation experiment finds that formation gas can be invaded by the fissure channel less than 500 microns of A/Fs
In pit shaft.Using traditional solid particle loss circulation material can only in outside clogging microcrack opening, once wellbore fluids
Circulation, these loss circulation materials, which are washed, leaves microcrack opening part, will occur the risk of gas cut overflow again, moreover, these
Loss circulation material is traditional rigid solid material, and the blocking layer of formation does not have compressibility, it is impossible to obtains compressibility densification
Closure.Therefore, it is necessary to can be entered using one kind in drilling well inside microcrack, by building bridge, stage filling and compaction,
The plugging material of tempering toughness with gentleness of fine and close plugged zone is formed, stops that gas enters pit shaft inside the gas reservoir of stratum by microcrack, every
Break its passage, so as to reach in drilling well with the safety drilling purpose for boring the closure anti-gas cut in crack.
Research shows that can block microcrack must possess following necessary condition with the brill closure anti-gas cut agent in crack：
（1）It is less than the mesh of standard sub-sieve 200 with the granularity for boring the closure anti-gas cut agent in crack, is easy to particle to pass through Drilling vibration
Sieve, meanwhile, facilitate access for inside gas reservoir crack, formed in crack and blocked；
（2）Under certain condition（Temperature, pressure etc.）There is change deformation with fractions in the closure anti-gas cut agent in crack are bored
Software feature, helps to form gas-liquid separate layer compressible, that permeability is extremely low, and the gas-liquid separate layer formed should have certain
Reverse anti-air pressure ability；
（3）It can not dissolve but must be well dispersed in water or oil with the brill closure anti-gas cut agent in crack, be easy to drilling well
Liquid circulation conveying.
（4）There should be certain acid-soluble ratio with the closure anti-gas cut agent in crack is bored, be advantageous to the acid-soluble de-plugging of reservoir.
Based on conditions above, that is studied can meet to block crack gas shutoff gas-tight with brill with the brill closure anti-gas cut agent in crack
The requirement of principle and technology is invaded, the overflow risk come to reducing gas cut and gas invaded zone, ensures gas-bearing formation drilling safety, accelerates
The exploration and development process of petroleum resources is significant.
Solve to reduce gas reservoir drilling well underground because gas-liquid replaces the production technology problem of generation gas cut in Fractured Gas Reservoir drilling well
The dangerous risk such as the overflow that stratum gas cut is brought.
The content of the invention
It is an object of the present invention to provide a kind of crack that blocked in Fractured Gas Reservoir drilling well to prevent the drilling fluid gas-tight of gas cut
Invade agent and preparation method thereof.The present invention is made up of polymer beads, calcium carbonate superfine powder particle, cotton fiber and a small amount of bentonite in powder,
Polymer beads can be（120℃）Produce the effect of softening deformable seal under softening point temperature, calcium carbonate superfine powder, cotton fiber and swollen
Moisten native powder and play bridge formation and stage filling effect, complete the non-deposition closure caused in leakage gas-bearing fracture jointly, and formed fine and close stifled
Gas-bearing formation, the gas channel of gas-bearing fracture is effectively blocked, prevent the gas caused by gravity displacement and gas-liquid displacement from invading well
In cylinder, ensure the safety of gas-bearing formation well section drilling well.Preparation method of the present invention is reasonable, easy to use, use easy to spread.
A kind of crack that blocked in Fractured Gas Reservoir drilling well of the present invention prevents the anti-gas cut agent of the drilling fluid of gas cut,
It is characterized in that include the polyethylene glycol of mass fraction 10.0-15.2 parts with the closure anti-gas cut agent in crack is bored, 14.0-25.5 parts
Maleic anhydride, the trimethylolpropane allyl ether of 14.5-25.5 parts, the bentonite in powder of 0.2-0.5 parts, 30-35 parts
Calcium carbonate superfine powder powder, the cotton fiber of 3.0-5.0 parts.
It is above-described to be with the brill closure anti-gas cut agent manufacturing process in crack：
（1）The polyethylene glycol for weighing 10.0-15.2 parts is added in mass fraction 180-260 part water, stands 30- at normal temperatures
After 40 minutes, under the conditions of 30-35 DEG C of constant temperature, it is uniformly mixed；
（2）Weigh the maleic anhydride of mass fraction 14.0-25.5 parts and the trimethylolpropane two of 14.5-25.5 parts
Allyl ether, add in above-mentioned solution, be uniformly mixed；
（3）Above-mentioned solution is heated to 40-50 DEG C, it is 7-9 to adjust solution ph with pH adjusting agent；
（4）Initiator is added, in 60-80 DEG C and above-mentioned mixed solution stirring reaction 60-100 minutes, reaction is made sticky
Shaped polymer；
（5）Sticky shaped polymer is dried under the conditions of 90-104 DEG C, mills and crushed the mesh sample of standard screen 20 sieve, gathered
Polymer beads；
（6）Order weighs the bentonite of mass fraction 0.2-0.5 parts, the calcium carbonate superfine powder powder of 30-35 parts, 3.0-5.0 parts
Cotton fiber add in polymer beads, be stirred 40-60 minutes, through ball milling it is finely ground to 200 microns of average grain diameter be made with
Bore the closure anti-gas cut agent in crack.
Above-described initiator is TBHP, and its dosage is maleic and acid anhydrides and trimethylolpropane two
The 0.4-0.7% of allyl ether quality.
Above-described pH value regulator is technical grade solid sodium hydroxide.
Above-described polyethylene glycol is the technical grade polyethylene glycol that relative molecular weight is 400.
Above-described calcium carbonate superfine powder powder is the Paris white that point sample standard screen mesh number is 1250 mesh.
Above-described cotton fiber is the cotton fiber that point sample standard screen mesh number is 200 mesh.
Above-described bentonite is the bentonite in powder that point sample standard screen mesh number is 200 mesh.
The present invention blocks fissure channel in gassiness microcrack prevents that the mechanism of action of gas cut from being：Drilling fluid and strata pressure
Difference force the anti-gas cut agent that is scattered in drilling fluid to enter towards flowing at low pressure in crack in crack, when crack external pressure is with preventing
When the frictional resistance and equal gas pressure sum of gas cut agent and crack wall, anti-gas cut agent stops sliding, multiple anti-gas cut agent
Quickly form dense accumulation body, dense accumulation body further grows and forms dense packing body, plus polymerizeing in anti-gas cut agent component
The deformable seal effect of composition granule, dense packing body further forms extremely low infiltration slider, so as to prevent the gas in microcrack
Body flowing exchanges with gas-liquid, and prevention formation gas effectively prevents the hair of gas cut in drilling well along microcrack passage to Wellbore Flow
It is raw.
The present invention has following beneficial to advantageous effects：
（1）Less than 500 microns of gas-bearing fracture can be effectively blocked, prevents gas-liquid displacement hair caused by inside crack
It is raw, prevent flowing of the gas by fissure channel by stratum direction crack openings direction.It is of the present invention to block crack with brill
Anti- gas cut agent particle mean size is the mesh of standard scores sample grit number 200, can pass through ground with the drilling fluid of circulation in drilling process
The following wire screen aperture of the mesh of vibratory sieve 200, have with brill handling characteristics.（2）Polymer as the crucial deformation special efficacy material that softens
With temperature sensitivity and pressure sensibility, plugged zone conglomerate is collectively forming with rigid particles under temperature and pressure effect,
So that the conglomerate has compressive characteristics, the permeability of plugged zone conglomerate is further reduced, prevents passing through for gas.（3）
It is of the present invention that there is certain acid-soluble ratio with the brill closure anti-gas cut agent in crack, block crack gas cut available for Reservoir Section.
Using simulation gas-bearing fracture plugging tester, it compared for not plus and add with after the brill closure anti-gas cut agent in crack
The anti-gas cut effect in caulking joint crack.Simulation fracture is shaped as the microcrack with certain wedge-shaped degree, fracture length 42cm, height
30cm, along crack oral area to caudal directions.
Experiment is with base slurry formula：5% prehydration bentonite slurry+0.08%CMC-HV（The viscous sodium carboxymethylcellulose of height）, can
To reach suspended solid effect, its basic performance is as shown in table 1.
Table 1 tests base slurry basic performance data
The experiment of closure crack is carried out for microcrack, nitrogen, air pressure 3-4KPa is filled with crack.Table 2 is with brill
The closure anti-gas cut agent in crack blocks the experimental data of situation in microcrack, and the block-up position in tables of data is with block section distance
The length in crack openings portion represents that wastage is marked using the drilling fluid or drilling fluid filtrate for flowing out the crack port of export as metering
Standard, the drilling fluid volume in slit plate are not counted in wastage, and anti-gas cut agent dosage is calculated by quality volume percentage.Sealed in table 2
Stifled rate is calculated as follows shown in formula.
In formula, V0Wastage, ml are starched for base；V1To add the wastage after sealing agent, ml.
Table 2 blocks the anti-gas cut experimental result of microcrack
Note：Reverse pressure-bearing is after cancelling positive pressure, reversely to apply the data that air pressure overflows to forward direction.
Test result indicates that with the addition of the closure anti-gas cut agent in crack, the drilling fluid leakage amount occurred by microcrack
Drastically reduce, 1% dosage be can reach 89% sealing ratiod, sealing ratiod reaches 98.8% during 5% dosage, and resistance gas passes through fine fisssure
The reverse pressure-bearing power that the plugged zone of seam intrusion pit shaft is pierced is up to 4KPa.Increasing positive pressure difference, wastage further reduces,
Show that plugged zone has compressibility.
With the addition of the closure anti-gas cut agent in crack, a most obvious effect is that wastage drastically reduces.Experiment starts
Afterwards, anti-gas cut agent quickly forms plugged zone in crack, transparent filtrate occurs after plugged zone, in addition, after adding anti-gas cut agent
The scope of block-up position broadens, and block-up position extends to crack afterbody.It is apparent that block position after adding anti-gas cut agent
Put that great changes will take place, be changed into 8-10cm from 7-9.0cm, wastage occurs significantly to decline, and illustrates the gas-tight of higher concentration
Invade agent to have a great influence to plugging effect so that block-up position significantly moves to crack oral area, while adds the cause of plugged zone
Close property.
In summary, provided by the invention effectively to block gas-bearing fracture with the brill closure anti-gas cut agent of microcrack, 5% adds
During amount, drilling well liquid-based wastage of the slurry in microcrack can be made to be reduced to 6ml from 500ml, sealing ratiod is up to 98.8%, in microcrack
Plugged zone is reversely 3.5KPa by the bearing capacity of gas penetration.
Embodiment：
The initiator is TBHP, and its dosage is maleic and acid anhydrides and trimethylolpropane allyl
The 0.4-0.7% of ether quality.
Described pH value regulator is technical grade solid sodium hydroxide.
Shut-off capacity evaluation has been carried out with the brill closure anti-gas cut agent of microcrack to being invented using simulated experiment indoors.
Steel substrate of the experiment using length 42cm, visualization lucite top plate combination microcrack module, to anti-gas cut agent full of
The anti-gas cut effect assessment of closure microcrack has been carried out under the microcrack width conditions of nitrogen.
Embodiment 1
The described preparation method for blocking the anti-gas cut agent in crack with boring：
1）Weigh 15.2 parts of polyethylene glycol to add in 260 parts of water of mass fraction, after standing 40 minutes at normal temperatures, in perseverance
Under the conditions of 35 DEG C of temperature, it is uniformly mixed；
2）The maleic anhydride and 25.5 parts of trimethylolpropane allyl ether of 25.5 parts of mass fraction are weighed, is added
Enter in above-mentioned solution, be uniformly mixed；
3）Above-mentioned solution is heated to 50 DEG C, is 9 with pH adjusting agent regulation solution ph；
4）Initiator is added, in 80 DEG C and above-mentioned mixed solution stirring reaction 100 minutes, reacts and thick polymerization is made
Thing；
5）Sticky shaped polymer is dried under the conditions of 104 DEG C, mills and crushed 20 mesh samples sieve, obtain polymer beads；
6）The bentonite, 35 parts of calcium carbonate superfine powder powder, 5.0 parts of cotton fiber that order weighs 0.5 part of mass fraction add
In polymer beads, it is stirred 60 minutes, the mesh of standard sub-sieve 200 was arrived through ball milling is finely ground, is made and prevents with brill closure crack
Gas cut agent.
Selection A/F is 0.6mm, and tail width is 0.15mm microcrack module, prepares drilling well liquid-based slurry 1.0L,
Base slurry formula is：5% prehydration bentonite slurry+0.08%CMC-HV（The viscous sodium carboxymethylcellulose of height）.Prevent with closure microcrack is bored
Gas cut agent dosage be drilling well liquid-based slurry 1%, positive pressure difference be 3.0KPa, by microcrack generation drilling fluid leakage amount from
500ml is reduced to 55ml, and the sealing ratiod of anti-gas cut agent is 89%, and plugged zone is reversely by the bearing capacity of gas penetration in microcrack
1KPa。
Embodiment 2
The described preparation method for blocking the anti-gas cut agent in crack with boring,
1）Weigh 10.0 parts of polyethylene glycol to add in 180 parts of water of mass fraction, after standing 30 minutes at normal temperatures, in perseverance
Under the conditions of 30 DEG C of temperature, it is uniformly mixed；
2）The maleic anhydride and 14.5 parts of trimethylolpropane allyl ether of 14.0 parts of mass fraction are weighed, is added
Enter in above-mentioned solution, be uniformly mixed；
3）Above-mentioned solution is heated to 40 DEG C, is 7 with PH conditioning agents regulation solution ph；
4）Initiator is added, in 60 DEG C and above-mentioned mixed solution stirring reaction 60 minutes, reacts and sticky shaped polymer is made；
5）Sticky shaped polymer is dried under the conditions of 90 DEG C, mills and crushed 20 mesh samples sieve, obtain polymer beads；
6）The bentonite, 30 parts of calcium carbonate superfine powder powder, 3.0 parts of cotton fiber that order weighs 0.2 part of mass fraction add
In polymer beads, it is stirred 40 minutes, the mesh of standard sub-sieve 200 was arrived through ball milling is finely ground, is made and prevents with brill closure crack
Gas cut agent；
Selection A/F is 0.6mm, and tail width is 0.15mm microcrack module, prepares drilling well liquid-based slurry 1.0L,
Base slurry formula is：5% prehydration bentonite slurry+0.08%CMC-HV（The viscous sodium carboxymethylcellulose of height）.Prevent with closure microcrack is bored
Gas cut agent dosage be drilling well liquid-based slurry 2%, positive pressure difference be 3.0KPa, by microcrack generation drilling fluid leakage amount from
500ml is reduced to 25ml, and the sealing ratiod of anti-gas cut agent is 95%, and plugged zone is reversely by the bearing capacity of gas penetration in microcrack
2KPa。
Embodiment 3
The described preparation method for blocking the anti-gas cut agent in crack with boring,
1）Weigh 12.2 parts of polyethylene glycol to add in 200 parts of water of mass fraction, after standing 35 minutes at normal temperatures, in perseverance
Under the conditions of 32 DEG C of temperature, it is uniformly mixed；
2）The maleic anhydride and 20.5 parts of trimethylolpropane allyl ether of 20.5 parts of mass fraction are weighed,
Add in above-mentioned solution, be uniformly mixed；
3）Above-mentioned solution is heated to 45 DEG C, is 8 with PH conditioning agents regulation solution ph；
4）Initiator is added, in 70 DEG C and above-mentioned mixed solution stirring reaction 80 minutes, reacts and sticky shaped polymer is made；
5）Sticky shaped polymer is dried under the conditions of 100 DEG C, mills and crushed 20 mesh samples sieve, obtain polymer beads；
6）The bentonite, 32 parts of calcium carbonate superfine powder powder, 4.0 parts of cotton fiber that order weighs 0.4 part of mass fraction add
In polymer beads, it is stirred 50 minutes, the mesh of standard sub-sieve 200 was arrived through ball milling is finely ground, is made and prevents with brill closure crack
Gas cut agent；
Selection A/F is 0.6mm, and tail width is 0.15mm microcrack module, prepares drilling well liquid-based slurry 1.0L,
Base slurry formula is：5% prehydration bentonite slurry+0.08%CMC-HV（The viscous sodium carboxymethylcellulose of height）.Prevent with closure microcrack is bored
Gas cut agent dosage be drilling well liquid-based slurry 3%, positive pressure difference be 3.0KPa, by microcrack generation drilling fluid leakage amount from
500ml is reduced to 15ml, and the sealing ratiod of anti-gas cut agent is 97%, and plugged zone is reversely by the bearing capacity of gas penetration in microcrack
3KPa。
Embodiment 4
This is same with the anti-gas cut agent preparation method in brill closure crack and embodiment 1；
Selection A/F is 0.6mm, and tail width is 0.15mm microcrack module, prepares drilling well liquid-based slurry 1.0L,
Base slurry formula is：5% prehydration bentonite slurry+0.08%CMC-HV（The viscous sodium carboxymethylcellulose of height）.Prevent with closure microcrack is bored
Gas cut agent dosage be drilling well liquid-based slurry 5%, positive pressure difference be 3.0KPa, by microcrack generation drilling fluid leakage amount from
500ml is reduced to 6ml, and the sealing ratiod of anti-gas cut agent is 98.8%, and plugged zone is reversely by the bearing capacity of gas penetration in microcrack
4KPa。
Embodiment 5
This is same with the anti-gas cut agent preparation method in brill closure crack and embodiment 2；
Selection A/F is 0.6mm, and tail width is 0.15mm microcrack module, prepares drilling well liquid-based slurry 1.0L,
Base slurry formula is：5% prehydration bentonite slurry+0.08%CMC-HV（The viscous sodium carboxymethylcellulose of height）.Prevent with closure microcrack is bored
Gas cut agent dosage be drilling well liquid-based slurry 5%, positive pressure difference be 4.5KPa, by microcrack generation drilling fluid leakage amount from
500ml is reduced to 5ml, and the sealing ratiod of anti-gas cut agent is 99.0%, and plugged zone is reversely by the bearing capacity of gas penetration in microcrack
4KPa。
Claims (6)
1. a kind of block the anti-gas cut agent in crack with brill, it is characterised in that：The anti-gas cut agent in crack should be blocked by mass fraction with boring
The polyethylene glycol of 10.0-15.2 parts, the maleic anhydride of 14.0-25.5 parts, the trimethylolpropane diene of 14.5-25.5 parts
Propyl ether, the bentonite in powder of 0.2-0.5 parts, the calcium carbonate superfine powder powder of 30-35 parts, the cotton fiber composition of 3.0-5.0 parts；
The preparation method for blocking the anti-gas cut agent in crack with boring comprises the following steps：
1) polyethylene glycol for weighing 10.0-15.2 parts is added in mass fraction 180-260 part water, stands 30-40 points at normal temperatures
Zhong Hou, under the conditions of 30-35 DEG C of constant temperature, it is uniformly mixed；
2) maleic anhydride of mass fraction 14.0-25.5 parts and the allyl of trimethylolpropane two of 14.5-25.5 parts are weighed
Base ether, add in above-mentioned solution, be uniformly mixed；
3) above-mentioned solution is heated to 40-50 DEG C, it is 7-9 to adjust solution ph with pH adjusting agent；
4) initiator is added, in 60-80 DEG C and above-mentioned mixed solution stirring reaction 60-100 minutes, reacts and thick polymerization is made
Thing；
5) sticky shaped polymer is dried under the conditions of 90-104 DEG C, mills and crushed 20 mesh samples sieve, obtain polymer beads；
6) it is fine that the bentonite of mass fraction 0.2-0.5 parts, the calcium carbonate superfine powder powder of 30-35 parts, the cotton of 3.0-5.0 parts are sequentially weighed
Dimension is added in polymer beads, is stirred 40-60 minutes, the mesh of standard sub-sieve 200 was arrived through ball milling is finely ground, is made and is sealed with brill
Chink anti-gas cut agent；
The initiator is TBHP, and its dosage is maleic anhydride and trimethylolpropane allyl ether matter
The 0.4-0.7% of amount；
Described pH value regulator is technical grade solid sodium hydroxide.
2. block the anti-gas cut agent in crack with brill according to claim l, it is characterised in that：Polyethylene glycol is relative molecular weight
For 400 technical grade polyethylene glycol.
3. block the anti-gas cut agent in crack with brill according to claim l, it is characterised in that：Calcium carbonate superfine powder powder is to divide sample mark
Quasi- grit number is the Paris white of 1250 mesh.
4. block the anti-gas cut agent in crack with brill according to claim l, it is characterised in that：Cotton fiber is to divide sample Standard mesh
Number is the cotton fiber of 200 mesh.
5. block the anti-gas cut agent in crack with brill according to claim l, it is characterised in that：Bentonite is to divide sample Standard mesh
Number is the bentonite in powder of 200 mesh.
6. the preparation method for blocking the anti-gas cut agent in crack with boring described in claim any one of l-5, it is characterised in that：This method
Comprise the following steps：
1) polyethylene glycol for weighing 10.0-15.2 parts is added in mass fraction 180-260 part water, stands 30-40 points at normal temperatures
Zhong Hou, under the conditions of 30-35 DEG C of constant temperature, it is uniformly mixed；
2) maleic anhydride of mass fraction 14.0-25.5 parts and the allyl of trimethylolpropane two of 14.5-25.5 parts are weighed
Base ether, add in above-mentioned solution, be uniformly mixed；
3) above-mentioned solution is heated to 40-50 DEG C, it is 7-9 to adjust solution ph with pH adjusting agent；
4) initiator is added, in 60-80 DEG C and above-mentioned mixed solution stirring reaction 60-100 minutes, reacts and thick polymerization is made
Thing；
5) sticky shaped polymer is dried under the conditions of 90-104 DEG C, mills and crushed 20 mesh samples sieve, obtain polymer beads；
6) it is fine that the bentonite of mass fraction 0.2-0.5 parts, the calcium carbonate superfine powder powder of 30-35 parts, the cotton of 3.0-5.0 parts are sequentially weighed
Dimension is added in polymer beads, is stirred 40-60 minutes, the mesh of standard sub-sieve 200 was arrived through ball milling is finely ground, is made and is sealed with brill
Chink anti-gas cut agent；
The initiator is TBHP, and its dosage is maleic anhydride and trimethylolpropane allyl ether matter
The 0.4-0.7% of amount；
Described pH value regulator is technical grade solid sodium hydroxide.
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