CN109810682A - A kind of heat molten type sealing agent, with drilling fluid and its preparation method and application - Google Patents
A kind of heat molten type sealing agent, with drilling fluid and its preparation method and application Download PDFInfo
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- CN109810682A CN109810682A CN201910185779.1A CN201910185779A CN109810682A CN 109810682 A CN109810682 A CN 109810682A CN 201910185779 A CN201910185779 A CN 201910185779A CN 109810682 A CN109810682 A CN 109810682A
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Abstract
The present invention relates to drilling fluid leak stopping fields, disclose a kind of heat molten type sealing agent, wherein the sealing agent includes pitch particle, thermoplastic resin particle, inorganic solid phase particle and flexible fiber.Invention additionally discloses a kind of preparation methods with drilling fluid, wherein, it is described to include the heat molten type sealing agent with drilling fluid, method includes: pitch particle, thermoplastic resin particle, the inorganic solid phase particle that (1) contains the heat molten type sealing agent, it is added and carries out high-speed stirred to uniform into clear water or base slurry, obtain mixture I；(2) flexible fiber contained the heat molten type sealing agent is added in the mixture I, and is stirred at low speed to uniform, obtains described with drilling fluid.The sealing agent has excellent heat-resisting quantity with drilling fluid, and excellent sealing characteristics can be realized in high-temperature stratum.
Description
Technical field
The present invention relates to drilling fluid leak stopping fields, and in particular to a kind of heat molten type sealing agent, with drilling fluid and preparation method thereof
And application
Background technique
Leakage is one of most common borehole problems in current drilling process, directly reduction bit speed, increase
Drilling cost is to restrict one of major technology bottlenecks of reservoirs explorations development rate such as oil gas, gas hydrates, underground heat.
Leakage may occur on different type stratum, wherein with carbonate reservoir (crack, solution cavity development) leakage journey
Most serious is spent, is also most difficult to solve.Plugging technology while drilling be prevention and control critical eigenvalue severe well leakage common and effective technology it
One, which reaches side circulation drilling, banding leak stopping is lost logical by adding a certain amount of sealing agent into drilling-fluid circulation system
Road, the purpose for reducing drilling fluid leakage, wherein drill-feeding plugging agent is the key that leak stopping success or not.
Low temperature formation severe mud losses plugging while drilling material category is more at present, and application effect is irregular；For high temperature
For (120 DEG C of >, 150 DEG C of usual >) formation fracture severe mud losses, harsher requirement is proposed to plugging material.Therefore,
Plugging while drilling material resistant to high temperatures is one of research emphasis.
CN106867485A discloses a kind of sealing agent preparation method and applications resistant to high temperatures, which includes polyacrylamide
Amine, sulfonated phenol formaldehyde resin, hexa, water swelling type particle sealing agent, uniaxial pressure sealer etc., can satisfy
The leak stopping of 80-150 DEG C of drilling well needs.But the gel-like sealing agent in above-mentioned sealing agent not can be carried out realization plugging while drilling.
CN108977183A discloses a kind of adaptive sealing agent, mainly by elastic sponge, dispersion fiber, activated clay material
Material, calcium carbonate superfine powder, graphite-filled object, vermiculite and water composition, have good heat-resisting property.Above-mentioned sealing agent and crack wall surface
Poor adhesive force, rely primarily on itself component and mutually fill and form colmatation zone, to improve its retention in crack, need
Concentration is improved, cost is caused to increase.
Therefore, it is urgent to provide a kind of drill-feeding plugging agents with good heat-resisting quantity.
Summary of the invention
The purpose of the invention is to overcome drilling well of the existing technology to be not applied for stratum high-temperature with sealing agent
It in environment, and cannot achieve plugging while drilling, provide a kind of heat molten type sealing agent, with drilling fluid and its preparation method and application, this is stifled
Leaking agent has excellent heat-resisting quantity, for that can realize excellent sealing characteristics in high-temperature stratum with drilling fluid.
To achieve the goals above, first aspect present invention provides a kind of heat molten type sealing agent, wherein the sealing agent packet
Include pitch particle, thermoplastic resin particle, inorganic solid phase particle and flexible fiber.
It is preferably based on the total weight of the sealing agent, the content of the pitch particle is 20-40wt%, the thermoplastic
Property resin particle content be 10-25wt%, the content of the inorganic solid phase particle is 40-60wt%, the flexible fiber
Content is 10-25wt%；Preferably, the content of the pitch particle is 25-35wt%, the content of the thermoplastic resin particle
For 12-22wt%, the content of the inorganic solid phase particle is 45-55wt%, and the content of the flexible fiber is 12-20wt%.
Preferably, the softening point range of the pitch particle is 80-180 DEG C, density 0.92-1.07g/cm3；It is preferred that
Ground, the softening point range of the pitch particle are 100-180 DEG C, density 0.97-1.02g/cm3。
Preferably, the pitch particle is modified pitch particle；It is highly preferred that the pitch particle is sulfonation modifying pitch
Particle；It is highly preferred that the pitch particle is sulfonic acid chloride modified pitch particle.
Preferably, the heat distortion temperature range of the thermoplastic resin particle is 140-220 DEG C, density 1.20-
1.35g/cm3；Preferably, the heat distortion temperature of the thermoplastic resin particle is 160-220 DEG C, density 1.20-1.30g/
cm3。
Preferably, the inorganic solid phase particle includes calcium carbonate superfine powder and/or activated clay.
Preferably, the flexible fiber is modified superfine polypropylene fibre；It is highly preferred that the flexible fiber has Y type
Section.
Second aspect of the present invention provides a kind of preparation method with drilling fluid, wherein described to include heat of the invention with drilling fluid
Molten type sealing agent, method include: the pitch particle, thermoplastic resin particle, inorganic solid that (1) contains the heat molten type sealing agent
Phase particle is added into base slurry and carries out high-speed stirred to uniform, obtains mixture I；(2) the heat molten type sealing agent is contained
Flexible fiber is added in the mixture I, and is stirred at low speed to uniform, obtains described with drilling fluid.
Preferably, the stirring rate of the high-speed stirred is 800-1500 revs/min, preferably 1000-1200 revs/min
Clock；The stirring rate stirred at low speed is 60-300 revs/min, preferably 100-150 revs/min.
It is preferably based on the weight of 100mL base slurry, the dosage of the heat molten type sealing agent is 5-15wt%, it is preferable that institute
The dosage for stating heat molten type sealing agent is 6-12wt%.
Third aspect present invention provides a kind of sealing agent as made from preparation method of the invention with drilling fluid.
Fourth aspect present invention provides a kind of heat molten type sealing agent of the invention or sealing agent of the invention answering with drilling fluid
With, wherein the application is drill-in fluid leak stopping.
Through the above technical solutions, the beneficial effect master of heat molten type sealing agent provided by the invention and sealing agent with drilling fluid
It embodies as follows:
(1) pitch particle in sealing agent provided by the present invention, thermoplastic resin particle can in crack inlet and
Internal coordination effect in crack is detained bridge formation and forms colmatation zone；The inorganic solid phases such as activated clay particle can be with Fast Filling colmatation zone
In hole, reduce the porosity and permeability of colmatation zone；Flexible fiber can be formed disorderly inside colmatation zone to support construction,
So that networking of building bridge between particle, end form forms fine and close blocking strips at space net structure, finally in crack, reaches closure
The purpose in crack leakage space.Sealing agent provided by the present invention has excellent plugging effect.
(2) sealing agent provided by the invention has excellent heat-resisting quantity, can still have in high-temperature stratum environment excellent
Different sealing characteristics.Specifically, the present invention provides pitch particle, thermoplastic resin in sealing agent under the conditions of high-temperature stratum
Particle can melt, and form the substance with sticking property, can be mutual by rigid inorganic solid phase particles and flexible fiber
It is adhered, is formed and have elasticity/be adhered the colmatation zone of property, enhance the frame strength inside colmatation zone, while greatly improving blocking
The adhesion strength of layer and high-temperature stratum crack wall surface improves retention, and then enhances seal-off effect of the sealing agent in high-temperature stratum
Energy.
(3) preparation method with drilling fluid of heat molten type sealing agent provided by the invention can be thus achieved by stirring, operate
Simply, and production cost can be significantly reduced, is improved efficiency with extemporaneous preparation.
Specific embodiment
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
First aspect present invention provides a kind of heat molten type sealing agent, wherein the sealing agent includes pitch particle, thermoplasticity
Resin particle, inorganic solid phase particle and flexible fiber.
In the prior art, organic matter grease type, pitch, paraffin, rubber and plastic or other material be under the conditions of certain temperature,
It can melt, become liquid, and this phenomenon is referred to as the meltbility of material.
In the present invention, the pitch particle and the thermoplastic resin particle have at high temperature different softening point or
Heat distortion temperature, under the high temperature conditions, pitch particle and thermoplastic resin particle are transformed into flexible material, are in sticky shape substance,
With adhesive while there is excellent deformability, it can cooperate, be formed with inorganic solid phase particle and flexible fiber
Compact structure and sticky colmatation zone, while modified pitch particle and thermoplasticity quality particle can attach to crack wall surface,
And then improve the retention of colmatation zone.
According to the present invention, the total weight based on the sealing agent, the content of the pitch particle is 20-40wt%, described
The content of thermoplastic resin particle is 10-25wt%, and the content of the inorganic solid phase particle is 40-60wt%, described flexible fine
The content of dimension is 10-25wt%；Preferably, the content of the pitch particle is 25-35wt%, the thermoplastic resin particle
Content is 12-22wt%, and the content of the inorganic solid phase particle is 45-55wt%, and the content of the flexible fiber is 12-
20wt%.
According to the present invention, the softening point range of the pitch particle is 80-180 DEG C, density 0.92-1.07g/cm3；It is excellent
Selection of land, the softening point range of the pitch particle are 100-180 DEG C, density 0.97-1.02g/cm3。
In the present invention, in order to regulate and control the degree for the thermotropic melt variation that sealing agent occurs in different high-temperature stratum environment,
So that formation is elastic between generation and the other components that melting variation does not occur/and it is adhered complex, enhance sealing agent in high temperature
The adhesion strength on the surfaces such as layer crack improves sealing characteristics, and a variety of pitch particles with different softening point are used in the present invention, and
The softening point of pitch particle is distributed as 80-180 DEG C, it is preferable that the softening point is distributed as 100-180 DEG C.
In order to guarantee that pitch particle in high-temperature stratum, melts in time, and the degree for ensuring to melt is controllable, preferably
Ground, so that the partial size of pitch particle of the present invention is 200-1500 μm, preferably 400-800 μm.
As known to those skilled in the art, pitch mainly presses different proportion group by saturated phenol, fragrant phenol, resin and asphalt
At oleophyllie hydrophobic colloform texture body, bad dispersibility in water and/or base slurry is easy agglomerate, is unfavorable for carrying to underground.Cause
And in order to improve dispersibility of the pitch particle in water and/or base slurry, preferably pitch particle is modified, by modification,
Hydrophilic radical is introduced on pitch particle surface, enhances the hydrophily of pitch particle, and then improves pitch particle in water and/or base
Dispersibility in slurry.Further, its hydration of pitch after modified enhances, and significantly increases in the adhesive ability of rock wall surface
By force, and then the temperature applicable range of sealing agent has been widened.
For the mode of modified pitch particle, it is preferable that carry out sulfonation modifying to pitch particle；It is highly preferred that using sulphur
Acyl chlorides is modified pitch particle.
According to the present invention, the heat distortion temperature range of the thermoplastic resin particle is 140-220 DEG C, density 1.20-
1.35g/cm3；Preferably, the heat distortion temperature of the thermoplastic resin particle is 160-220 DEG C, density 1.20-1.30g/
cm3。
In actual use due to sealing agent, locating formation temperature is very likely higher than pitch of the present invention
The highest softening point of grain, and at this point, pitch generation excess molten, leads to the reduction of its viscosity, with the other components in sealing agent, example
It is adhered effect reduction such as between inorganic solid phase particle, flexible fiber, satisfactorily sealing characteristics can not be obtained.
Even if in order to ensure the sealing agent temperature it is higher in stratum, it may have excellently sealing characteristics, the present invention
In, the thermoplastic resin particle that a certain amount of heat distortion temperature is higher than pitch particle softening temperature is added in the sealing agent,
Can be with the mutual coordinated of pitch particle, in the higher stratum of temperature, still ensuring that has foot between sealing agent each component
Enough is adhered performance, it is ensured that sealing agent obtains satisfactory plugging effect.
In order to enable sealing agent in different high-temperature stratum environment, has different degrees of thermotropic melt variation degree, makes
It must occur and not occur to be formed between the other components of melting variation elasticity/be adhered complex, enhance sealing agent in different high temperature
The adhesion strength on the surfaces such as formation fracture improves sealing characteristics.A variety of thermoplastics with different heat distortion temperatures are used in the present invention
Property resin particle, and the heat distortion temperature of thermoplastic resin particle is distributed as 140-220 DEG C, it is preferable that the heat distortion temperature
It is distributed as 160-220 DEG C.
Further, in order to guarantee that thermoplastic resin particle in high-temperature stratum, melts in time, at the same time,
The degree for ensuring to melt is controllable, it is preferable that so that the partial size of thermoplastic resin particle of the present invention is 200-1000 μm, preferably
It is 400-700 μm.
According to the present invention, the inorganic solid phase particle includes calcium carbonate superfine powder and/or activated clay.
In the present invention, the partial size of the calcium carbonate superfine powder is 200-300 mesh, and the partial size of the activated clay is higher than 300 mesh.
Wherein, calcium carbonate superfine powder plays the role of filler in sealing agent；And activated clay can not only play the role of filler, and
Since it is with layer structure, ion exchange can occur in water and/or base slurry, so that the interlamellar spacing between clay layer
Expand, forms the lattice structure of clay layer and irreducible water, further enhance the intensity and toughness of filler.
In the present invention, the activated clay includes diatom mountain flour, lithium soap mountain flour, medical stone powder, a kind of in attapulgite powder
Or several composition.
According to the present invention, the flexible fiber is modified superfine polypropylene fibre；Preferably, the flexible fiber has Y
Type section.
In the present invention, the flexible fiber has Y-shaped section, substantially increases the surface area of fiber, and can be
A kind of unrest is formed inside colmatation zone to support construction, realizes the bridge formation networking between hot melt particle, solid phase particles, it is stifled to play enhancing
Leak the effect of agent support strength.
In the present invention, in order to further improve flexible fiber and other components and base slurry between compatibility, convenient for
Sealing agent is transferred to underground, realizes the plugging action of sealing agent, and inventor has carried out modification to flexible fiber, it is preferable that
Flexible fiber is modified using silane coupling agent.Dispersibility of the flexible fiber modified in water dispenser solution is more
It is good.
In the present invention, the diameter of the flexible fiber is 30-200 μm preferably 60-100 μm；The length of fiber is 0.5-
3mm, preferably 1-1.5mm.
In the present invention, each component in the sealing agent respectively can be saved independently before use, can also be with sealing agent
The form of composition exists.
The second aspect of the present invention provides a kind of preparation method with drilling fluid, wherein it is described with drilling fluid include it is of the invention
Heat molten type sealing agent, method include: (1) the heat molten type sealing agent is contained modified pitch particle, thermoplastic resin particle,
Inorganic solid phase particle is added and carries out high-speed stirred to uniform into clear water or base slurry, obtains mixture I；(2) by the heat molten type
Flexible fiber that sealing agent contains is added in the mixture I, and is stirred at low speed to uniform, obtains described with drilling fluid.
In order to enable pitch particle, thermoplastic resin particle, inorganic solid phase particle can be mixed quickly and be uniformly dispersed, this hair
It is bright that pitch particle, thermoplastic resin particle and inorganic solid phase particle are mixed using high mixing speed.Simultaneously as
Relative distribution is slower in the solution for flexible fiber, and high-speed stirred will lead to it and adhere on stirring rod or reunite in the solution,
Thus flexible fiber is uniformly mixed with other components using low mixing speed in the present invention.
In the present invention, according to the present invention, the stirring rate of the high-speed stirred is 800-1500 revs/min, preferably
1000-1200 revs/min；The stirring rate stirred at low speed is 60-300 revs/min, preferably 100-150 revs/min.
According to the present invention, the weight based on 100mL base slurry, the dosage of the heat molten type sealing agent are 5-15wt%, preferably
Ground, the dosage of the heat molten type sealing agent are 6-12wt%.
In the present invention, the base slurry is preferably bentonite slurry.
Third aspect present invention provides a kind of sealing agent as made from preparation method of the invention with drilling fluid.
Fourth aspect present invention provides a kind of heat molten type sealing agent of the invention or sealing agent of the invention answering with drilling fluid
With, wherein the application is drill-in fluid leak stopping.
The present invention will be described in detail by way of examples below.In following embodiment, using LHKYDL-3 type high temperature
The plugging effect of high pressure leaking stoppage test device test sealing agent fracture.
Use leak stopping test device be equipped with throat width for 5.0mm, exit width 1.0mm, length be 15cm not
The plugging effect of rust gad shape slit plate model measurement sealing agent.
Experimental temperature is 160 DEG C, and testing procedure is as follows: by pouring into leak stopping instrument dehydration cylinder with drilling fluid for 500mL sealing agent；
It is being put into moveable piston with drilling fluid top, is then screwing cover sealing；It is pressurizeed, is controlled using huge discharge advection pump priming
Pressing speed is pressurized to 7MPa with the speed of 1MPa/10min, observes and records crack outlet wastage；After experiment, close
Constant-flux pump is closed, crack Slab is dismantled in pressure release, observes the block-up position of plugging material fracture, and record blocking segment length.
In the embodiment of the present invention and comparative example modified pitch I used be purchased from Dalian Ming Qiang Chemical Co., Ltd., it is soft
Changing point is 120 DEG C, and average grain diameter is 600 μm, density 0.97g/cm3；
Sulfonic acid chloride modified pitch II is purchased from Dalian Ming Qiang Chemical Co., Ltd., and softening point is 140 DEG C, and average grain diameter is
600 μm, density 1.02g/cm3；
Sulfonic acid chloride modified pitch III is purchased from Dalian Ming Qiang Chemical Co., Ltd., and softening point is 150 DEG C, average grain diameter
It is 600 μm, density 1.04g/cm3；
Unmodified pitch is purchased from Dalian Ming Qiang Chemical Co., Ltd., and softening point is 60 DEG C, and average grain diameter is 600 μm, close
Degree is 0.96g/cm3；
Thermoplastic polyurethane resin I is purchased from Anhui Anda-Huatai New Material Co., Ltd., heat distortion temperature 160
DEG C, average grain diameter is 500 μm, density 1.20g/cm3；
Thermoplastic polyurethane resin II is purchased from Anhui Anda-Huatai New Material Co., Ltd., heat distortion temperature 150
DEG C, average grain diameter is 500 μm, density 1.25g/cm3。
Thermoplastic polyurethane resin III is purchased from Anhui Anda-Huatai New Material Co., Ltd., heat distortion temperature 140
DEG C, average grain diameter is 500 μm, density 1.28g/cm3；
Modified flexible fiber I is the silane coupler modified superfine polypropylene flexible fiber with Y-shaped section, is purchased from
Wuxi Meike silk Science and Technology Ltd., 60 μm of flexible fiber average diameter, average length 1mm, density 0.91g/cm3；
Modified flexible fiber II is the silane coupler modified superfine polypropylene flexible fiber with Y-shaped section, nothing
Tin Meike silk Science and Technology Ltd., 80 μm of flexible fiber average diameter, average length 1.2mm, density 0.93g/cm3；
Unmodified flexible fiber is the superfine polypropylene flexible fiber with Y-shaped section, purchased from Wuxi Meike silk science and technology
Co., Ltd, 60 μm, average length 1mm, density 0.91g/cm of the average diameter of flexible fiber3。
Embodiment 1:
On the basis of the total weight of 100mL leak stopping base slurry, the dosage of sealing agent is the 6% of leak stopping base slurry.
Wherein, the composition of sealing agent each component are as follows: the content of sulfonic acid chloride modified pitch particle I is 20wt%, thermoplastic poly
The content of urethane resin particle I is 15wt%, and the content of inorganic solid phase particle is 50wt%, modified superfine polypropylene flexible fiber
The content of I is 15wt%.
Wherein, inorganic solid phase particle includes calcium carbonate superfine powder, diatom mountain flour and lithium soap mountain flour, and the partial size of calcium carbonate superfine powder is
250 mesh, the partial size of diatom mountain flour are 350 mesh, and the partial size of lithium soap mountain flour is 500 mesh；
Wherein, on the basis of the total weight of inorganic solid phase particle, the content of calcium carbonate superfine powder is 50wt%, diatom mountain flour
Content is 30wt%, and the content of lithium soap mountain flour is 20wt%.
Sealing agent comprising heat molten type sealing agent with drilling fluid preparation method:
(1) by the modified pitch particle of above-mentioned weight, thermoplastic resin particle and by calcium carbonate superfine powder, diatom mountain flour and
The inorganic solid phase particle of lithium soap mountain flour composition is mixed with bentonite slurry, and high-speed stirred obtains mixture I to uniform；
(2) flexible fiber of above-mentioned weight is added in said mixture I, stirs at low speed to uniform, obtains the heat molten type
Sealing agent with drilling fluid A1.Wherein, high-speed stirred rate is 1000 revs/min, and stirring at low speed rate is 100 revs/min.
Test sealing agent with drilling fluid A1 to the plugging effect of stainless steel wedge-shaped fracture Slab, test result such as 1 institute of table
Show.
Embodiment 2:
On the basis of the total weight of 100mL leak stopping base slurry, the dosage of sealing agent is the 12% of leak stopping base slurry.
Wherein, the composition of sealing agent each component are as follows: the content of sulfonic acid chloride modified pitch particle II is 28wt%, thermoplastic poly
The content of urethane resin particle II is 14wt%, and the content of inorganic solid phase particle is 45wt%, superfine polypropylene flexible fiber II
Content be 13wt%.
Wherein, inorganic solid phase particle includes calcium carbonate superfine powder, diatom mountain flour and lithium soap mountain flour, calcium carbonate superfine powder partial size 300
Mesh, 400 mesh of kieselguhr powder diameter, 500 mesh of hectorite powder diameter；
Wherein, on the basis of the total weight of inorganic solid phase particle, the content of calcium carbonate superfine powder is 30wt%, diatom mountain flour
Content is 30wt%, and the content of lithium soap mountain flour is 40wt%.
Sealing agent comprising heat molten type sealing agent with drilling fluid preparation method:
(1) by the modified pitch particle of above-mentioned weight, thermoplastic resin particle and by calcium carbonate superfine powder, diatom mountain flour and
The inorganic solid phase particle of lithium soap mountain flour composition is mixed with bentonite slurry, and high-speed stirred obtains mixture I to uniform；
(2) flexible fiber of above-mentioned weight is added in said mixture I, stirs at low speed to uniform, obtains the heat molten type
Sealing agent with drilling fluid A2.Wherein, high-speed stirred rate is 1000 revs/min, and stirring at low speed rate is 100 revs/min.
Test sealing agent with drilling fluid A2 to the plugging effect of stainless steel wedge-shaped fracture Slab, test result such as 2 institute of table
Show.
Embodiment 3
Heat molten type sealing agent is prepared with drilling fluid using method same as Example 1, the difference is that: by thermoplastic resin
Grain such as replaces at the modified pitch particle of weight.Sealing agent is obtained with drilling fluid A3.
Embodiment 4
Heat molten type sealing agent is prepared with drilling fluid using method same as Example 1, the difference is that: by modified pitch particle
The thermoplastic resin particle of weight such as replace with.Sealing agent is obtained with drilling fluid A4.
Embodiment 5
Heat molten type sealing agent is prepared with drilling fluid using method same as Example 2, the difference is that: respectively using two kinds of tools
There are modified pitch the particle II and III of different softening point, wherein the content of modified pitch particle II is 14wt%, and softening point is
140 DEG C, the content of modified pitch particle III is 14wt%, and softening point is 150 DEG C.Sealing agent is obtained with drilling fluid A5.
Embodiment 6
Heat molten type sealing agent is prepared with drilling fluid using method same as Example 2, the difference is that: respectively using two kinds of tools
There are the thermoplastic resin particle III and II of different heat distortion temperatures, wherein the content of thermoplastic resin particle III is 7wt%,
Heat distortion temperature is 140 DEG C；The content of thermoplastic resin particle II is 7wt%, and heat distortion temperature is 150 DEG C.Obtain sealing agent
With drilling fluid A6.
Embodiment 7
Heat molten type sealing agent is prepared with drilling fluid using method same as Example 2, the difference is that: the stirring of high-speed stirred
Rate is 800 revs/min；The stirring rate stirred at low speed is 60 revs/min.Sealing agent is obtained with drilling fluid A7.
Comparative example 1:
Sealing agent is prepared in the same manner as shown in Example 1 and its with drilling fluid, except that by modified pitch particle
The walnut shell particle of equal quality, same partial size is replaced with thermoplastic resin particle, and sealing agent is made after evenly mixing
With drilling fluid B1；Test sealing agent with drilling fluid B1 to the plugging effect in different slit width cracks, test result is as shown in table 1.
Comparative example 2
Heat molten type sealing agent is prepared with drilling fluid using method same as Example 1, the difference is that: it the use of softening point is 70
DEG C modified pitch particle.Sealing agent is obtained with drilling fluid B2.
Comparative example 3
Heat molten type sealing agent is prepared with drilling fluid using method same as Example 1, the difference is that: use heat distortion temperature
For 170 DEG C of thermoplastic resin particle.Sealing agent is obtained with drilling fluid B3.
Comparative example 4
Heat molten type sealing agent is prepared with drilling fluid using method same as Example 1, the difference is that: by modified pitch
Grain, thermoplastic resin particle and the inorganic solid phase particle being made of calcium carbonate superfine powder, diatom mountain flour and lithium soap mountain flour, flexible fibre
Dimension is mixed with bentonite slurry, is stirred until homogeneous under the speed that low whipping speed is 800 revs/min.Sealing agent is obtained with drilling fluid B4.
Comparative example 5
Heat molten type sealing agent is prepared with drilling fluid using method same as Example 2, the difference is that: use unmodified pitch
Instead of modified pitch particle.Sealing agent is obtained with drilling fluid B5.
Comparative example 6
Heat molten type sealing agent is prepared with drilling fluid using method same as Example 2, the difference is that: using unmodified super
Thin polypropylene flexible fiber replaces modified superfine polypropylene flexible fiber.Sealing agent is obtained with drilling fluid B6.
Sealing agent is with drilling fluid plugging effect in 1 embodiment and comparative example of table
Sealing agent provided by the present invention is with drilling fluid A1-A2, A5-A7 to the plugging effect of stainless steel wedge-shaped fracture Slab
Preferably, the complete closure of fracture is realized after pressure rise to 3MPa.And above-mentioned test result explanation, hot melt of the invention
Type sealing agent at least can be used for the fracture-type reservoir plugging while drilling of aperture 5mm, and at least 160 DEG C of temperature resistance.
And thermoplastic resin particle is not contained, only for the sealing agent comprising modified pitch in drilling fluid A3, pressure works as pressure liter
There is linear leakage phenomena in up to 2MPa, and when pressure rise is to 3MPa, i.e. generation total loss phenomenon, is not able to achieve counterincision
The plugging effect of seam.This is because the softening point of modified pitch is lower than the heat distortion temperature of thermoplastic resin particle, with pressure
Increase, temperature increases, and mobility significantly increases pitch at high temperature, cannot achieve plugging action.
And sealing agent on the other side, since it does not contain modified pitch, only contains thermoplastic resin particle with drilling fluid A4,
And when pressure is lower, since formation temperature is lower at this time, the not up to heat distortion temperature of thermoplastic resin particle, thermoplastic resin
Rouge particle cannot achieve the plugging action of fracture.
And modified pitch particle and different thermal changes with different softening point are respectively adopted with drilling fluid A5 and A6 for sealing agent
The thermoplastic resin particle of shape temperature is cooperated, due to different modified asphalt and thermoplastic resin particle occur softening and
The temperature of deformation is different, so that sealing agent all has good plugging effect with drilling fluid under the conditions of different pressures.
And modified pitch and thermoplastic resin particle are not contained, only the leak stopping containing walnut shell particle is in drilling fluid B1, by
In walnut shell particle with the variation of pressure and temperature, structure will not change, only as solid particle to realize counterincision
The closure of seam.Therefore, with the increase of temperature and pressure, it can no longer meet the demand of closure.
And the sealing agent with the modified pitch of low softening point is used with drilling fluid B2, since its softening point is lower, in pressure
And temperature it is lower when, that is, softening takes place, with the increase of temperature and pressure, excess molten occurs for pitch, and viscosity is aobvious
Writing reduces, and causes the sealing characteristics of sealing agent to reduce, can not obtain enough plugging effects.
And the sealing agent with the thermoplastic resin particle of high heat distortion temperature is used with drilling fluid B3, due to its thermal deformation temperature
Degree is high, and when formation temperature is higher than modified pitch softening point, pitch starts excess molten, and due to the heat of thermoplastic resin particle
Deformation temperature is higher, thus it does not have started and softens, can not replacing asphalt particle realize each component between be adhered performance,
Cause sealing agent that can not obtain enough sealing characteristics.
And sealing agent with drilling fluid B4 due to being mixed using same mixing speed to each component in its preparation process, lead
Sealing agent is caused to mix with each component in drilling fluid uneven, moieties, such as flexible fiber are even reunited, and envelope can not be played
Stifled effect causes sealing agent poor with the plugging effect of drilling fluid B5.
And use the sealing agent of unmodified pitch with the sealing agent of drilling fluid B5 and unmodified flexible fiber with drilling fluid B6.The former
Since the dispersibility of pitch is poor or even Severe aggregation occurs for pitch particle, it is caused more preferably not soften and be attached to
Fracture faces cause sealing agent poor with the plugging effect of drilling fluid.And the latter is since fiber is unmodified, dispersed to reduce, Bu Nengyu
Effective network support structure is formed between other components, can not improve the intensity of sealing agent, and then causes sealing agent with drilling fluid
Plugging effect reduce.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.In skill of the invention
In art conception range, can with various simple variants of the technical solution of the present invention are made, including each technical characteristic with it is any its
Its suitable method is combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, is belonged to
Protection scope of the present invention.
Claims (12)
1. a kind of heat molten type sealing agent, wherein the sealing agent includes pitch particle, thermoplastic resin particle, inorganic solid phase
Grain and flexible fiber.
2. sealing agent according to claim 1, wherein the total weight based on the sealing agent, the pitch particle contain
Amount is 20-40wt%, and the content of the thermoplastic resin particle is 10-25wt%, and the content of the inorganic solid phase particle is 40-
60wt%, the content of the flexible fiber are 10-25wt%；Preferably, the content of the pitch particle is 25-35wt%, institute
The content for stating thermoplastic resin particle is 12-22wt%, and the content of the inorganic solid phase particle is 45-55wt%, the flexibility
The content of fiber is 12-20wt%.
3. sealing agent according to claim 1 or 2, wherein the softening point range of the pitch particle is 80-180 DEG C, close
Degree is 0.92-1.07g/cm3；Preferably, the softening point range of the pitch particle is 100-180 DEG C, density 0.97-
1.02g/cm3。
4. sealing agent described in any one of -3 according to claim 1, wherein the pitch particle is modified pitch particle；
Preferably, the pitch particle is sulfonation modifying pitch particle；It is highly preferred that the pitch particle is sulfonic acid chloride modified pitch
Grain.
5. sealing agent described in any one of -4 according to claim 1, wherein the thermal deformation temperature of the thermoplastic resin particle
Spending range is 140-220 DEG C, density 1.20-1.35g/cm3；Preferably, the heat distortion temperature of the thermoplastic resin particle
It is 160-220 DEG C, density 1.20-1.30g/cm3。
6. sealing agent described in any one of -5 according to claim 1, wherein the inorganic solid phase particle includes ultra-fine carbonic acid
Calcium and/or activated clay.
7. sealing agent described in any one of -6 according to claim 1, wherein the flexible fiber is to use silane coupling agent
Modified superfine polypropylene fiber；Preferably, the flexible fiber has Y type section.
8. a kind of preparation method with drilling fluid, wherein described to include hot melt described in any one of claim 1-7 with drilling fluid
Type sealing agent, method include: pitch particle, thermoplastic resin particle, the inorganic solid phase that (1) contains the heat molten type sealing agent
Particle is added into drilling well liquid-based slurry and carries out high-speed stirred to uniform, obtains mixture I；(2) the heat molten type sealing agent is contained
Some flexible fibers is added in the mixture I, and is stirred at low speed to uniform, obtains described with drilling fluid.
9. preparation method according to claim 8, wherein the stirring rate of the high-speed stirred is 800-1500 revs/min
Clock, preferably 1000-1200 revs/min；The stirring rate stirred at low speed is 60-300 revs/min, preferably 100-150
Rev/min.
10. preparation method according to claim 8 or claim 9, wherein the weight based on 100mL base slurry, the heat molten type leak stopping
The dosage of agent is 5-15wt%, it is preferable that the dosage of the heat molten type sealing agent is 6-12wt%.
11. sealing agent made from a kind of preparation method as described in claim 8-9 any one is with drilling fluid.
12. sealing agent described in heat molten type sealing agent described in a kind of claim 1-7 any one or claim 11 is with brill
The application of liquid, wherein the application is drill-in fluid leak stopping.
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