CN109825269A - Shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION and the preparation method and application thereof - Google Patents
Shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION and the preparation method and application thereof Download PDFInfo
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Abstract
Drilling fluid leak stopping of the present invention field discloses a kind of shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION, including polymer compound monomer, solid phase organic macromolecule crosslinking agent, the first initiator, rheology adjusting control agent, toughener.The invention also discloses the preparation methods of above-mentioned GEL USED FOR PLUGGING WELL LOST CIRCULATION, comprising: polymer compound monomer, solid phase organic macromolecule crosslinking agent are added in clear water by (I), stir to get the mixed liquor a；(II) rheology adjusting control agent is added in the mixed liquor a, stirs to get mixed liquor b；(III) toughener is added in the mixed liquor b, stirs to get mixed liquor c；(IV) the first initiator is added in the mixed liquor c, stirs to get mixed liquor d；(V) by mixed liquor d sealing and standing, solidification plastic is carried out, obtains shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION.The GEL USED FOR PLUGGING WELL LOST CIRCULATION has shear loading characteristic appropriate, anti-dilution capacity, gelling strength, and has weak gravitational settling phenomenon.
Description
Technical field
The present invention relates to drilling fluid leak stopping fields, and in particular to a kind of shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION and preparation method thereof
With application.
Background technique
Leakage is one of most common borehole problems in current drilling process, and directly reduction bit speed, increase is bored
Well cost is to restrict one of major technology bottlenecks of reservoirs explorations development rate such as oil gas, gas hydrates, underground heat.Leakage
May it occur on different type stratum, wherein with carbonate reservoir (crack, solution cavity development) leakage degree most serious, also most
It is difficult to resolve certainly.
Gel leakage stopping technology is common and one of effective technology of control critical eigenvalue severe well leakage, and the technology is by leakage
A certain amount of GEL USED FOR PLUGGING WELL LOST CIRCULATION solution is injected in layer position, blocks crack after solidification, plays the work of isolation drilling fluid and formation fluid
With.Wherein, the performance quality of GEL USED FOR PLUGGING WELL LOST CIRCULATION is the key that leak stopping success or not.
Common gel-like blocking agent is mainly the high molecular polymer gel on ground or underground polymerization crosslinking.The gellike at
Intensity is high after glue, can play preferable closure leakage channel purpose.But there are some drawbacks for common GEL USED FOR PLUGGING WELL LOST CIRCULATION: (1)
High molecular polymer is easy to be influenced by Mud Property, and gel gelling strength is caused to decline；(2) due to the factors shadow such as density variation
It rings, common gravitational settling phenomenon of the GEL USED FOR PLUGGING WELL LOST CIRCULATION in vertical large fracture space is obvious, usually can be with filling and blocking large fracture
Bottom space, possible fracture headspace plugging effect poor (3) commonly use GEL USED FOR PLUGGING WELL LOST CIRCULATION anti-formation fluid diluting effect compared with
It is weak, it is easy to cause gelling strength weak.
Therefore, it is necessary to research and develop a kind of stifled with weak gravitational settling phenomenon, anti-dilution capacity is strong, gelling strength is high gel
Leak agent.
Summary of the invention
The purpose of the invention is to overcome GEL USED FOR PLUGGING WELL LOST CIRCULATION in the prior art easily to flow in actual application
Body dilution phenomenon, and the problem that gravitational settling phenomenon is obvious and gelinite gelling strength is lower, provide a kind of shear loading type
GEL USED FOR PLUGGING WELL LOST CIRCULATION and the preparation method and application thereof.The GEL USED FOR PLUGGING WELL LOST CIRCULATION is lower in flow process medium viscosity, is readily injected into stratum
Leakage channel；Viscosity should thicken rapidly after injection, be easy to be resident in leakage channel；Rapid crosslinking curing after standing,
High-intensitive plugged zone is formed, prevents drilling fluid from continuing to miss, there is excellent anti-dilution capacity and gelling strength, and have
Weak gravitational settling phenomenon.
To achieve the goals above, one aspect of the present invention provides a kind of shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION, including polymer
Compound monomer, solid phase organic macromolecule crosslinking agent, the first initiator, rheology adjusting control agent and toughener.
Preferably, on the basis of the total weight of the sealing agent, the content of the polymer compound monomer is 5-12wt%,
The content of the solid phase organic macromolecule crosslinking agent is 0.5-1.5wt%, and the content of first initiator is 0.1-
0.5wt%, the content of the rheology adjusting control agent are 1-5wt%, and the content of the toughener is 0.5-2wt%.
It is highly preferred that the content of the polymer compound monomer is 6- on the basis of the total weight of the sealing agent
10wt%, the content of the solid phase organic macromolecule crosslinking agent are 0.8-1.2wt%, and the content of first initiator is 0.2-
0.4wt%, the content of the rheology adjusting control agent are 2-4wt%, and the content of the toughener is 0.8-1.5wt%.
Preferably, the polymer compound monomer is acrylamide, 2- acrylamide-2-methyl propane sulfonic, vinyl acetate
Ester, methyl acrylate, styrene, two or more in methyl methacrylate.
Preferably, the solid phase organic macromolecule crosslinking agent is the crosslinking agent of active C=C double bond group.
Preferably, the initiator is oxidation-reduction initiator；Preferably, the oxidation-reduction initiator includes oxidation
Agent and reducing agent, wherein oxidant is potassium peroxydisulfate and/or ammonium persulfate, and reducing agent is sodium hydrogensulfite and/or sulfurous acid
Sodium；The mass ratio of oxidant and reducing agent is (0.5-1): 1.
It is highly preferred that the mass ratio of oxidant and reducing agent is (0.8-1): 1.
Preferably, the rheology adjusting control agent include double-metal hydroxide and nanoparticle, double-metal hydroxide with receive
The mass ratio of rice corpuscles is (2-6): 1.
It is highly preferred that the mass ratio of double-metal hydroxide and nanoparticle is (3-5): 1.
It is highly preferred that the double-metal hydroxide be magnalium double-metal hydroxide, silicon magnesium double-metal hydroxide and
One or both of lithium magnesium double-metal hydroxide；The nanoparticle is hydrophily gas phase nano SiO2。
Preferably, the toughener is one of polypropylene fibre, Fypro and polyester fiber or a variety of.
Preferably, the solid phase organic macromolecule crosslinking agent is made by following steps:
(1) reactive monomer and the second initiator are dissolved separately in deionized water, obtain solution A 1 and A2；
(2) lipophilic, hydrophilic emulsifier and oil phase solvent are stirred evenly, obtains solution B；
(3) solution A 1 is slowly added dropwise into the solution B, obtains solution C after mixing evenly；
(4) solution A 2 is slowly added dropwise into the solution C and is stirred evenly, under certain temperature, after standing reaction, obtained
To microemulsion D；
(5) organic crosslinking agent is added in the microemulsion D, and obtains microemulsion F after adjusting pH to faintly acid；
(6) precipitating reagent is mixed with the microemulsion F, solid matter is precipitated, it is dry after washed dose of washing, it obtains described
Solid phase organic macromolecule crosslinking agent.
Preferably, on the basis of the total weight of microemulsion D, the dosage of the reactive monomer is 2-7wt%, described second
The dosage of initiator is 0.05-0.4wt%, and the dosage of the oleophilic emulsifier is 4-10wt%, the use of the hydrophilic emulsifying agent
Amount is 8-18wt%, and the dosage of the oil phase solvent is 45-70wt%, and the dosage of the organic crosslinking agent is 1-3.5wt%.
It is highly preferred that on the basis of the total weight of microemulsion D, the dosage of the reactive monomer is 3-6wt%, described the
The dosage of two initiators is 0.1-0.3wt%, and the dosage of the oleophilic emulsifier is 5-8wt%, the use of the hydrophilic emulsifying agent
Amount is 10-15wt%, and the dosage of the oil phase solvent is 50-65wt%, and the dosage of the organic crosslinking agent is 1.5-3wt%.
Preferably, the reactive monomer is one of acrylamide, methacrylic acid, vinyl pyrrolidone or more
Kind.
Preferably, the initiator is potassium peroxydisulfate and/or ammonium persulfate.
Preferably, the oil emulsifier is the mixture of Span60 and Span80.
It is highly preferred that the mass ratio of the Span60 and Span80 is (0.2-0.6): 1.
It is highly preferred that the mass ratio of the Span60 and Span80 is (0.3-0.5): 1.
Preferably, the hydrophilic emulsifier is the mixture of Tween60 and Tween80.
It is highly preferred that the mass ratio of the Tween60 and Twee80 is (1-4): 1.
It is highly preferred that the mass ratio of the Tween60 and Tween80 is (1.5-2.5): 1.
Preferably, the oil phase solvent is at least one of hexamethylene, kerosene and atoleine.
Preferably, the organic crosslinking agent is N, N- methylene-bisacrylamide and/or N hydroxymethyl acrylamide.
Preferably, the pH value of alkaline condition described in step (1) is 8-10；Temperature described in step (4) is 50-70 DEG C；
PH value is 4-6, reaction time 2-6h in step (5)；Precipitating reagent described in step (6) is dehydrated alcohol；The detergent is
One of dehydrated alcohol and/or acetone.
Second aspect of the present invention provides a kind of preparation method of above-mentioned shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION, including following step
It is rapid:
(I) polymer compound monomer, solid phase organic macromolecule crosslinking agent are added in clear water, are stirred with the first mixing speed
It mixes to being completely dissolved, obtains the mixed liquor a；
(II) rheology adjusting control agent is added in the mixed liquor a, is stirred with the second mixing speed to being uniformly dispersed, is mixed
Close liquid b；
(III) toughener is added in the mixed liquor b, is stirred with third mixing speed to being uniformly dispersed, is mixed
Liquid c；
(IV) the first initiator is added in the mixed liquor c, is stirred with the 4th mixing speed to being completely dissolved, is mixed
Close liquid d；
(V) by mixed liquor d sealing and standing, solidification plastic is carried out, obtains the shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION.
Preferably, the first mixing speed is 500-1000 revs/min, preferably 600-800 revs/min；Second stirring speed
Degree is 300-500 revs/min, preferably 350-450 revs/min；Third mixing speed is 50-150 revs/min, preferably 80-
120 revs/min；4th mixing speed is 50-150 revs/min, preferably 80-120 revs/min；It is quiet in the step (III)
Setting temperature is 25-150 DEG C, and solidification gelation time is 5-1h.
Third of the present invention fermentation provides a kind of above-mentioned shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION or is prepared by the above method and cut
Cut the application of response type GEL USED FOR PLUGGING WELL LOST CIRCULATION, wherein the application is drilling fluid leak stopping.
Through the above technical solutions, provided by the invention state shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION and preparation method, have
Below the utility model has the advantages that
(1) GEL USED FOR PLUGGING WELL LOST CIRCULATION provided by the invention is before being added initiator solidification plastic, good fluidity, viscosity when stirring
Low, similar " gruel ", viscosity increases rapidly when stopping stirring, mobility is deteriorated or even loses flowability, and similar " butter " is added
Initiator generates high-intensitive, high tenacity gelinite, similar " rubber " after solidifying plastic.Surface Gelling Plugging Agent of the present invention has
The shear loading property of " shear thinning stands thickening ".
In practical applications, lower in injection process medium viscosity, it is readily injected into formation leakage channel, is being leaked after injection
It loses viscosity in channel to thicken rapidly, is easy to be resident, plastic is reacted under the conditions of ground environment, form high-intensitive plugged zone, blocking leakage
Channel is lost, prevents drilling fluid from continuing to miss.
(2) GEL USED FOR PLUGGING WELL LOST CIRCULATION provided by the invention uses a kind of solid phase organic macromolecule crosslinking agent, direct with tradition
Using N, the effect of N- methylene-bisacrylamide is compared, and solidifies that the gel strength generated after plastic is higher, toughness is stronger, right
Leakage channel has better plugging effect.
(3) compared with conventional polymer polymer gel, GEL USED FOR PLUGGING WELL LOST CIRCULATION provided by the present invention solidifies the weight before plastic
Power settlement action is weaker, and the migration leading edge in large fracture leakage space is uniform, can be complete by the formation fluid in leakage channel
Displacement, and then it is fully populated with leakage channel.
(4) compared with conventional polymer polymer gel, have before GEL USED FOR PLUGGING WELL LOST CIRCULATION solidification plastic provided by the present invention
Good endurance of cutting energy, after charge velocity solidifies plastic to it performance without influence, the GEL USED FOR PLUGGING WELL LOST CIRCULATION have it is good anti-ly
Layer fluid diluting effect.
(5) preparation method of GEL USED FOR PLUGGING WELL LOST CIRCULATION provided by the present invention is simple to operation, can live injection allocation.
Detailed description of the invention
Fig. 1 is the apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION solution A 1 with the variation relation of shear rate；
Fig. 2 is migration situation of the GEL USED FOR PLUGGING WELL LOST CIRCULATION solution A 1 in vertical fracture space；
Fig. 3 is the apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION solution A 2 with the variation relation of shear rate；
Fig. 4 is migration situation of the GEL USED FOR PLUGGING WELL LOST CIRCULATION solution A 2 in vertical fracture space；
Fig. 5 is the apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION solution D 1 with the variation relation of shear rate；
Fig. 6 is migration situation of the GEL USED FOR PLUGGING WELL LOST CIRCULATION solution D 1 in vertical fracture space；
Fig. 7 is the apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION solution D 2 with the variation relation of shear rate；
Fig. 8 is migration situation of the GEL USED FOR PLUGGING WELL LOST CIRCULATION solution D 2 in vertical fracture space；
Fig. 9 is the apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION solution D 3 with the variation relation of shear rate；
Figure 10 is migration situation of the GEL USED FOR PLUGGING WELL LOST CIRCULATION solution D 3 in vertical fracture space.
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 shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION, including polymer compound monomer, solid phase have
The agent of machine macromolecules cross-linking, the first initiator, rheology adjusting control agent and toughener.
In the present invention, GEL USED FOR PLUGGING WELL LOST CIRCULATION is to be polymerized using polymer compound monomer with solid phase organic macromolecule crosslinking agent
, with tradition directly using N, N- methylene-bisacrylamide is compared as the sealing agent of crosslinking agent, is solidified and is generated after plastic
Gel strength is higher, toughness is stronger, has better plugging effect to leakage channel.
At the same time, added rheology adjusting control agent and toughener in inventive gel sealing agent, so that the gel
Sealing agent has the shear loading property of " shear thinning stands thickening ".Viscosity is higher when GEL USED FOR PLUGGING WELL LOST CIRCULATION is initially stood, shearing
Under the conditions of have lower viscosity, be conducive to sealing agent inject formation leakage channel, and injection finish standing after, leak stopping fluid viscosity is fast
Speed increases, and is easy to be resident in formation leakage channel, plastic is reacted in ground environment, and then formed with excellent gelling strength
Plugged zone, to leakage channel have excellent plugging effect.
In order to obtain the gelinite with higher gelling strength and shear tenacity, inventor is to each component in sealing agent
Dosage is studied, by the study found that when on the basis of the total weight of the sealing agent, the polymer compound monomer
Content is 5-12wt%, and the content of the solid phase organic macromolecule crosslinking agent is 0.5-1.5wt%, and first initiator contains
Amount is 0.1-0.5wt%, and the content of the rheology adjusting control agent is 1-5wt%, when the content of the toughener is 0.5-2wt%,
Gelinite obtained has desired shear loading property, and has excellent gelling strength, endurance of cutting energy and anti-
Layer fluid diluting effect.
Preferably, on the basis of the total weight of the sealing agent, the content of the polymer compound monomer is 6-10wt%,
The content of the solid phase organic macromolecule crosslinking agent is 0.8-1.2wt%, and the content of first initiator is 0.2-
0.4wt%, the content of the rheology adjusting control agent are 2-4wt%, and the content of the toughener is 0.8-1.5wt%.
According to the present invention, the polymer compound monomer is acrylamide, 2- acrylamide-2-methyl propane sulfonic, acetic acid
Vinyl acetate, methyl acrylate, styrene, two or more in methyl methacrylate.
According to the present invention, the solid phase organic macromolecule crosslinking agent is the crosslinking agent of active C=C double bond group.
In the present invention, the active C=C double bond group of solid phase organic macromolecule crosslinking agent can be sent out with vinyl polymerization monomer
Raw cross-linking reaction improves the crosslink density of GEL USED FOR PLUGGING WELL LOST CIRCULATION, and then obtains and have the solidifying of excellent temperature stability and gel strength
Colloid.
According to the present invention, the initiator is oxidation-reduction initiator；Preferably, the oxidation-reduction initiator includes
Oxidizing and Reducing Agents, wherein oxidant is potassium peroxydisulfate and/or ammonium persulfate, and reducing agent is sodium hydrogensulfite and/or sulfurous
Sour sodium；The mass ratio of oxidant and reducing agent is (0.5-1): 1.
It is highly preferred that the mass ratio of oxidant and reducing agent is (0.8-1): 1.
According to the present invention, the rheology adjusting control agent includes double-metal hydroxide and nanoparticle, double-metal hydroxide
Mass ratio with nanoparticle is (2-6): 1.
In the present invention, the addition of rheology adjusting control agent realizes the adjustment to rheology of solution, has GEL USED FOR PLUGGING WELL LOST CIRCULATION and " cuts
Cut dilution, stand thickening " thixotropic behavior, in addition, it can be between the other components in GEL USED FOR PLUGGING WELL LOST CIRCULATION of the present invention
It reacts, cooperates, and then enhance the intensity of gel plastic, " easily injection, weak gravity are heavy so that GEL USED FOR PLUGGING WELL LOST CIRCULATION has
The technical effect of drop, strong closure ".
It is highly preferred that the mass ratio of double-metal hydroxide and nanoparticle is (3-5): 1.
In order to enable the GEL USED FOR PLUGGING WELL LOST CIRCULATION obtains excellent thixotropic property, it is preferable that the double-metal hydroxide is
One or both of magnalium double-metal hydroxide, silicon magnesium double-metal hydroxide and lithium magnesium double-metal hydroxide；It is described
Nanoparticle is hydrophily gas phase nano SiO2。
In the present invention, the magnalium double-metal hydroxide, silicon magnesium double-metal hydroxide, lithium magnesium double-metal hydroxide
Partial size be respectively 300-400 mesh, 400-500 mesh and 400-500 mesh, hydrophily gas phase nano SiO2Partial size be 10-30nm.
In order to further increase the intensity and endurance of cutting energy of gelinite, the present invention adds in the GEL USED FOR PLUGGING WELL LOST CIRCULATION
A certain amount of toughener can play bridging action between different molecular chain, and act synergistically with particle toughening agent, altogether
With the intensity and shear tenacity for improving gelinite.Specifically, toughener of the present invention is polypropylene fibre, Fypro
With one of polyester fiber or a variety of.
In the present invention, it is preferable that 60 μm, average length 1mm, density 0.91g/cm of the polypropylene fibre average diameter3；
80 μm, average length 1.6mm, density 1.08g/cm of the Fypro average diameter3；The polyester fiber average diameter 80
μm, average length 1.5mm, density 1.24g/cm3。
In the present invention, the solid phase organic macromolecule crosslinking agent of stating is made by following steps:
(1) reactive monomer and the second initiator are dissolved separately in deionized water, obtain solution A 1 and A2；
(2) lipophilic, hydrophilic emulsifier and oil phase solvent are stirred evenly, obtains solution B；
(3) solution A 1 is slowly added dropwise into the solution B, obtains solution C after mixing evenly；
(4) solution A 2 is slowly added dropwise into the solution C and is stirred evenly, under certain temperature, after standing reaction, obtained
To microemulsion D；
(5) organic crosslinking agent is added in the microemulsion D, and obtains microemulsion F after adjusting pH to faintly acid；
(6) precipitating reagent is mixed with the microemulsion F, solid matter is precipitated, it is dry after washed dose of washing, it obtains described
Solid phase organic macromolecule crosslinking agent.
In the present invention, solid phase organic macromolecule crosslinking agent is prepared using the above method, is answered polymer by emulsion polymerization
It closes monomer and organic crosslinking agent is copolymerized, to introduce activity C=C double bond group in organic crosslinking agent, so that in GEL USED FOR PLUGGING WELL LOST CIRCULATION
In, the reactivity between organic crosslinking agent and polymer compound monomer improves, so that the GEL USED FOR PLUGGING WELL LOST CIRCULATION obtained has
Excellent gelling strength and resistant to shearing energy.
There are higher gelling strength, endurance of cutting energy and anti-formation fluid dilution properties in order to obtain, and have suitably
The gelinite of shear loading property, inventor carry out the dosage of each component during preparation solid phase organic macromolecule crosslinking agent
Research, by the study found that the dosage of the reactive monomer is 2-7wt%, institute on the basis of the total weight of microemulsion D
The dosage for stating the second initiator is 0.05-0.4wt%, and the dosage of the oleophilic emulsifier is 4-10wt%, the hydrophilic emulsification
The dosage of agent is 8-18wt%, and the dosage of the oil phase solvent is 45-70wt%, and the dosage of the organic crosslinking agent is 1-
When 3.5wt%, preparation-obtained solid phase organic macromolecule crosslinking agent has higher reactivity, with the compound list of polymer
The gelinite that body is prepared has superior gelling strength, endurance of cutting energy and anti-formation fluid dilution properties.
It is highly preferred that on the basis of the total weight of microemulsion D, the dosage of the reactive monomer is 3-6wt%, described the
The dosage of two initiators is 0.1-0.3wt%, and the dosage of the oleophilic emulsifier is 5-8wt%, the use of the hydrophilic emulsifying agent
Amount is 10-15wt%, and the dosage of the oil phase solvent is 50-65wt%, and the dosage of the organic crosslinking agent is 1.5-3wt%.
According to the present invention, the reactive monomer is one of acrylamide, methacrylic acid, vinyl pyrrolidone
Or it is a variety of.
According to the present invention, the initiator is potassium peroxydisulfate and/or ammonium persulfate.
According to the present invention, the oil emulsifier is the mixture of Span60 and Span80.
In the present invention, it is preferable that the mass ratio of the Span60 and Span80 is (0.2-0.6): 1；It is highly preferred that described
The mass ratio of Span60 and Span80 is (0.3-0.5): 1.
In the present invention, using above-mentioned mass ratio Span60 and Span80 mixture as emulsifier, it is advantageous obtain it is high
The solid phase organic macromolecule crosslinking agent of yield.
According to the present invention, the hydrophilic emulsifier is the mixture of Tween60 and Tween80.
In the present invention, it is preferable that the mass ratio of the Tween60 and Tween80 is (1-4): 1；It is highly preferred that described
The mass ratio of Tween60 and Tween80 is (1.5-2.5): 1.
According to the present invention, the oil phase solvent is at least one of hexamethylene, kerosene and atoleine.
According to the present invention, the organic crosslinking agent is N, N- methylene-bisacrylamide and/or N hydroxymethyl acrylamide.
According to the present invention, the pH value of alkaline condition described in step (1) is 8-10；Temperature described in step (4) is 50-70
℃；PH value is 4-6, reaction time 2-6h in step (5)；Precipitating reagent described in step (6) is dehydrated alcohol；The detergent
For one of dehydrated alcohol and/or acetone.
Further, the pH value of alkaline condition described in step (1) is 8.5-9.5；Temperature described in step (4) is 55-
65℃；PH value in step (5) is 5-6, reaction time 3-5h.
Second aspect of the present invention provides a kind of preparation method of above-mentioned shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION, including following step
It is rapid:
(I) polymer compound monomer, solid phase organic macromolecule crosslinking agent are added in clear water, are stirred with the first mixing speed
It mixes to being completely dissolved, obtains the mixed liquor a；
(II) rheology adjusting control agent is added in the mixed liquor a, is stirred with the second mixing speed to being uniformly dispersed, is mixed
Close liquid b；
(III) toughener is added in the mixed liquor b, is stirred with third mixing speed to being uniformly dispersed, is mixed
Liquid c；
(IV) the first initiator is added in the mixed liquor c, is stirred with the 4th mixing speed to being completely dissolved, is mixed
Close liquid d；
(V) by mixed liquor d sealing and standing, solidification plastic is carried out, obtains the shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION.
In the present invention, by the different component in GEL USED FOR PLUGGING WELL LOST CIRCULATION, according to the difference of its response hierarchy and dissolution dispersity according to
It is secondary to be added in solution, it is ensured that each component can be sufficiently mixed uniformly, so that it is strong to be prepared GEL USED FOR PLUGGING WELL LOST CIRCULATION thixotropy, plastic
Intensity is high afterwards, and sealing characteristics is excellent.
According to the present invention, the first mixing speed is 500-1000 revs/min, preferably 600-800 revs/min；Second stirs
Mixing speed is 300-500 revs/min, preferably 350-450 revs/min；Third mixing speed is 50-150 revs/min, preferably
It is 80-120 revs/min；4th mixing speed is 50-150 revs/min, preferably 80-120 revs/min；The step (III)
In, dwell temperature is 25-150 DEG C, and solidification gelation time is 1-5h.
In the present invention, by setting high mixing speed for the first mixing speed, to guarantee polymer monomer and crosslinking agent
Quick uniform dissolution；And middle mixing speed is set by the second mixing speed, guarantee the evenly dispersed of rheology control agent；And third
With the 4th mixing speed be low mixing speed, be in order to guarantee the evenly dispersed of toughener, at this time due to rheology control agent plus
Enter, solution viscosity is caused to increase, low stirring rate can satisfy component dissolution dispersion needs, also can reduce reality with liquid process
Difficulty.
Wherein, third mixing speed can be identical with the 4th mixing speed, can not also be identical.
In the present invention, first initiator can be identical with the second initiator, can not also be identical.
In the present invention, the temperature environment of the step (III) can be room temperature.
Third aspect present invention provides the above-mentioned shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION of one kind or is prepared by the above method
The application of shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION, wherein the application is drilling fluid leak stopping.
The present invention will be described in detail by way of examples below.
The apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION: different shearing speed are tested using Haake (HAAKE) RS6000 type rotational rheometer
The apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION under the conditions of rate.Wherein, when apparent viscosity is bigger, show that GEL USED FOR PLUGGING WELL LOST CIRCULATION is more difficult to flow.Tool
Body, the test condition of Haake rotational rheometer is shear rate 0-1000 1/s.
Migration filling effect of the GEL USED FOR PLUGGING WELL LOST CIRCULATION in vertical fracture: use a length of 40cm of seam, a height of 20cm of seam, slit width for
Migration filling effect of the visualization plate fractured model test GEL USED FOR PLUGGING WELL LOST CIRCULATION of 5mm in vertical fracture.
The specific test method is as follows: and GEL USED FOR PLUGGING WELL LOST CIRCULATION solution after 1000ml is dyed (initiator is not added, it will not be to it
Flow behavior has an impact) it is fitted into intermediate receptacle, it is infused with the rate of 10ml/min to intermediate receptacle using huge discharge constant-flux pump
Gel solution is injected into the visualization plate fractured model being disposed vertically (simulation vertical fracture leakage by piston promotion by water
Lose space), migration state of the gel solution in fracture spaces is observed in real time, and then evaluates its filling effect in crack
The plugging effect of GEL USED FOR PLUGGING WELL LOST CIRCULATION: using stifled using LHKYDL-3 type high temperature and pressure leak stopping test device test gel
The plugging effect for leaking agent fracture is logical using the steel fractured model simulation leakage that length is 10cm, fracture width is 5.0mm
Road.
Specific test method: 500mL GEL USED FOR PLUGGING WELL LOST CIRCULATION solution (initiator is added) is poured into device for plugging dehydration cylinder；?
Upper part is put into moveable piston, then screws cover sealing；80 DEG C after its solidification, are carried out using huge discharge advection pump priming
Pressurization controls pressing speed, and every 10min increases 1MPa, is pressurized to 7MPa, observes and records the wastage of fractured model outlet.
Experimental temperature is set as 80 DEG C.
Solid phase organic macromolecule crosslinking agent and GEL USED FOR PLUGGING WELL LOST CIRCULATION used in the embodiment of the present invention are respectively adopted as follows
Method described in preparation example 1 and preparation example 2 is prepared.
Preparation example 1
(1) acrylamide/methacrylic acid (mass ratio 3:1) mix monomer 5g and ammonium persulfate 0.1g is dissolved separately in
In the deionized water of 6ml and 4ml, monomer solution A1 and initiator solution A2 are respectively obtained；
(2) Span60/Span80 (mass ratio 1:2) 9g and Tween60/Tween80 (mass ratio 2:1) 15g is mixed
It is mixed evenly after conjunction with 60ml hexamethylene, obtains solution B
(3) solution A 1 is slowly added dropwise into solution B, obtains solution C after mixing evenly；
(4) solution A 2 is slowly added dropwise and is stirred evenly into solution C, after 4h reaction is stood under the conditions of 60 DEG C, obtain micro emulsion
Liquid D；
(5) 1.2g N hydroxymethyl acrylamide is added into microemulsion D, and obtains micro emulsion after adjusting pH to faintly acid 4-5
Liquid F；
(6) microemulsion F is mixed with dehydrated alcohol, solid matter is precipitated, dry 5h after then being washed repeatedly using acetone,
Obtain solid phase organic macromolecule crosslinking agent.
Preparation example 2
(I) polymer compound monomer, solid phase organic macromolecule crosslinking agent are added in clear water, are stirred with 700 revs/min
It is completely dissolved to it, obtains the mixed liquor a；
(II) rheology adjusting control agent is added in the mixed liquor a, is uniformly dispersed, is mixed to it with 400 revs/min of stirrings
Close liquid b；
(III) toughener is added in the mixed liquor b, is uniformly dispersed, is mixed to it with 100 revs/min of stirrings
Liquid c；
(IV) the first initiator is added in the mixed liquor c, is completely dissolved, is mixed to it with 100 revs/min of stirrings
Close liquid d；Mixed liquor d is statically placed in 80 DEG C, solidification plastic is carried out, obtains shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION, wherein the
One initiator is the oxidation-reduction system that ammonium persulfate and sodium hydrogensulfite form, and the mass ratio of oxidant and reducing agent is
0.9:1。。
Embodiment 1:
The composition of GEL USED FOR PLUGGING WELL LOST CIRCULATION are as follows: the content of polymer compound monomer is 8wt%, solid phase organic macromolecule crosslinking agent
Content is 1.0wt%, and the content of initiator is 0.30wt%, and the content of rheology adjusting control agent is 4wt%, and the content of toughener is
1.2wt%, surplus are water.
Wherein, polymer compound monomer is acrylamide and 2- acrylamide-2-methyl propane sulfonic, and the mass ratio of the two is
5:1.Rheology adjusting control agent is magnalium double-metal hydroxide, lithium magnesium double-metal hydroxide and hydrophily gas phase nano SiO2, double
The mass ratio of metal hydroxides and nanoparticle is 5:1, magnalium double-metal hydroxide and lithium magnesium double-metal hydroxide
Mass ratio is 1:4.Toughener is polypropylene fibre and Fypro, and the mass ratio of the two is 1:1.
Shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION A1 is prepared according to method described in preparation example 2.
The apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION A1 is tested, experimental result is as shown in Figure 1.Test GEL USED FOR PLUGGING WELL LOST CIRCULATION solution A 1 is being split
Migration filling effect in seam, experimental result is as shown in Figure 2.Under the conditions of 80 DEG C of simulation, A1 pairs of GEL USED FOR PLUGGING WELL LOST CIRCULATION of shear loading type
The plugging effect in crack, test result are as shown in table 1.
As shown in Figure 1, when shear rate is zero (stationary state), the apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION A1 is very high, reaches
3200mPas or more；With the increase of shear rate, apparent viscosity is reduced rapidly, when shear rate is 100 1/s, gel
The apparent viscosity of leak stopping agent solution is reduced to 600mPas or so, final to stablize in 160mPas or so.Hereafter, shear rate
It gradually decreases, apparent viscosity starts slowly to go up, and is finally increased to 3200mPas or more again.Above-mentioned phenomenon illustrates that gel is stifled
Leaking agent solution A1 has good " shear shinning stands thickening " characteristic, and stands again after shearing, and solution can re-establish
Apparent viscosity does not receive the influence of shear history.Therefore, the injection that GEL USED FOR PLUGGING WELL LOST CIRCULATION solution A 1 can satisfy live different rates is wanted
It asks.
As shown in Figure 2, after GEL USED FOR PLUGGING WELL LOST CIRCULATION A1 is injected into vertical fracture space, the migration leading edge of gel solution can be with
It is more uniformly pushed ahead along the top, middle part and bottom in crack, does not show apparent gravitational settling phenomenon
It is filled with fracture spaces.Illustrate that GEL USED FOR PLUGGING WELL LOST CIRCULATION A1 is suitable for blocking vertical fracture leakage channel.
By data in table 1 it is found that shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION A1 solidifies the plugging strength height of fracture after plastic, hold
There is no leakage when pressure reaches 7MPa, illustrate that the plugging effect of the GEL USED FOR PLUGGING WELL LOST CIRCULATION is good.
Embodiment 2
GEL USED FOR PLUGGING WELL LOST CIRCULATION is prepared using method same as Example 1, unlike: the composition of GEL USED FOR PLUGGING WELL LOST CIRCULATION are as follows: poly-
The content for closing object compound monomer is 6wt%, and the content of solid phase organic macromolecule crosslinking agent is 0.8wt%, and the content of initiator is
0.15wt%, the content of rheology adjusting control agent are 4wt%, and the content of toughener is 1wt%.And polymer compound monomer is acryloyl
Amine and 2- acrylamide-2-methyl propane sulfonic, the mass ratio of the two are 6:1.Obtain shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION A2.
The apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION A2 is tested, experimental result is as shown in Figure 3.Test GEL USED FOR PLUGGING WELL LOST CIRCULATION solution A 2 is being split
Migration filling effect in seam, experimental result is as shown in Figure 4.Under the conditions of 80 DEG C of simulation, A2 pairs of GEL USED FOR PLUGGING WELL LOST CIRCULATION of shear loading type
The plugging effect in crack, test result are as shown in table 1.
From the figure 3, it may be seen that the apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION A2 is very high when shear rate is zero (stationary state), reach
3400mPas or more；With the increase of shear rate, apparent viscosity is reduced rapidly, when shear rate is 100 1/s, gel
The apparent viscosity of leak stopping agent solution is reduced to 500mPas or so, final to stablize in 150mPas or so.Hereafter, shear rate
It gradually decreases, apparent viscosity starts slowly to go up, and is finally increased to 3400mPas or more again.Above-mentioned phenomenon illustrates that gel is stifled
Leaking agent A2 has good " shear shinning stands thickening " characteristic, and stands again after shearing, and solution can re-establish apparently
Viscosity does not receive the influence of shear history.Therefore, GEL USED FOR PLUGGING WELL LOST CIRCULATION A2 can satisfy the injection requirement of live different rates.
As shown in Figure 4, after GEL USED FOR PLUGGING WELL LOST CIRCULATION A2 is injected into vertical fracture space, the migration leading edge of gel solution can be with
It is more uniformly pushed ahead along the top, middle part and bottom in crack, does not show apparent gravitational settling phenomenon
It is filled with fracture spaces.Illustrate that GEL USED FOR PLUGGING WELL LOST CIRCULATION A2 is suitable for blocking vertical fracture leakage channel.
By data in table 1 it is found that shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION A2 solidifies the plugging strength height of fracture after plastic, hold
There is no leakage when pressure reaches 7MPa, illustrate that the plugging effect of the GEL USED FOR PLUGGING WELL LOST CIRCULATION is good.
Comparative example 1
GEL USED FOR PLUGGING WELL LOST CIRCULATION is prepared using method same as Example 1, unlike: use N, N- methylene bisacrylamide acyl
The solid phase organic macromolecule crosslinking agent that amine replaces.GEL USED FOR PLUGGING WELL LOST CIRCULATION D1 is made.
The apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION D1 is tested, experimental result is as shown in Figure 5.Test GEL USED FOR PLUGGING WELL LOST CIRCULATION solution D 1 is being split
Migration filling effect in seam, experimental result is as shown in Figure 6.Under the conditions of 80 DEG C of simulation, D1 pairs of GEL USED FOR PLUGGING WELL LOST CIRCULATION of shear loading type
The plugging effect in crack, test result are as shown in table 1.
As shown in Figure 5, using N, after the solid phase organic macromolecule crosslinking agent that N- methylene-bisacrylamide replaces, it is made solidifying
Glue sealing agent D1 still has " shear shinning stands thickening " characteristic, but solution viscosity decreases.It will be appreciated from fig. 6 that with implementation
Example 1 is compared, and gravitational settling effect when GEL USED FOR PLUGGING WELL LOST CIRCULATION D1 migrates in vertical fracture is remarkably reinforced, and migration leading edge is in slope
Shape, fracture upper space filling effect are poor.By data in table 1 it is found that compared with Example 1, shear loading type gel leak stopping
The plugging strength that agent D1 solidifies fracture after plastic is poor, and water clock, generation when pressure-bearing reaches 7MPa occur when reaching 5MPa for pressure
Linear leakage.
Comparative example 2
GEL USED FOR PLUGGING WELL LOST CIRCULATION is prepared using method same as Example 1, unlike: be free of toughener.It is stifled that gel is made
Leak agent D2.
The apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION D2 is tested, experimental result is as shown in Figure 7.Test GEL USED FOR PLUGGING WELL LOST CIRCULATION solution D 2 is being split
Migration filling effect in seam, experimental result is as shown in Figure 8.Under the conditions of 80 DEG C of simulation, D2 pairs of GEL USED FOR PLUGGING WELL LOST CIRCULATION of shear loading type
The plugging effect in crack, test result are as shown in table 1.
As shown in Figure 7, when being free of toughener, GEL USED FOR PLUGGING WELL LOST CIRCULATION D2, which is made, still to be had, and " shear shinning stands thickening " is special
Property, but solution viscosity is substantially reduced.As shown in Figure 8, compared with Example 1, when GEL USED FOR PLUGGING WELL LOST CIRCULATION D2 migrates in vertical fracture
Gravitational settling effect be remarkably reinforced, migration leading edge is in ramped shaped, and fracture upper space filling effect is poor.By data in table 1
It is found that compared with Example 1, the plugging strength that shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION D2 solidifies fracture after plastic is poor, pressure
Water clock occurs when reaching 5MPa, when reaching 7MPa total loss occurs for pressure-bearing.
Comparative example 3
GEL USED FOR PLUGGING WELL LOST CIRCULATION is prepared using method same as Example 1, unlike: be free of rheology adjusting control agent.It is made solidifying
Glue sealing agent D3.
The apparent viscosity of GEL USED FOR PLUGGING WELL LOST CIRCULATION D3 is tested, experimental result is as shown in Figure 9.Test GEL USED FOR PLUGGING WELL LOST CIRCULATION solution D 3 is being split
Migration filling effect in seam, experimental result is as shown in Figure 10.Under the conditions of 80 DEG C of simulation, D3 pairs of GEL USED FOR PLUGGING WELL LOST CIRCULATION of shear loading type
The plugging effect in crack, test result are as shown in table 1.
As shown in Figure 9, when being free of rheology adjusting control agent, obtained GEL USED FOR PLUGGING WELL LOST CIRCULATION D3 viscosity is very low, does not have thixotropic behavior.By
Figure 10 is it is found that compared with Example 1, preferential filling Slit bottom when GEL USED FOR PLUGGING WELL LOST CIRCULATION D3 migrates in vertical fracture, counterincision
It is poor to sew on portion's space filling effect.By data in table 1 it is found that compared with Example 1, shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION D3 solidifies
The plugging strength of fracture is poor after plastic, and water clock occurs when reaching 4MPa for pressure, and when reaching 5MPa total loss occurs for pressure-bearing.
The closure test effect of 1 GEL USED FOR PLUGGING WELL LOST CIRCULATION A1-D3 fracture of table
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 (10)
1. a kind of shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION, including polymer compound monomer, solid phase organic macromolecule crosslinking agent, first draw
Send out agent, rheology adjusting control agent and toughener.
2. GEL USED FOR PLUGGING WELL LOST CIRCULATION according to claim 1, wherein on the basis of the total weight of the sealing agent, the polymerization
The content of object compound monomer is 5-12wt%, and the content of the solid phase organic macromolecule crosslinking agent is 0.5-1.5wt%, described the
The content of one initiator is 0.1-0.5wt%, and the content of the rheology adjusting control agent is 1-5wt%, and the content of the toughener is
0.5-2wt%；
Preferably, on the basis of the total weight of the sealing agent, the content of the polymer compound monomer is 6-10wt%, described
The content of solid phase organic macromolecule crosslinking agent is 0.8-1.2wt%, and the content of first initiator is 0.2-0.4wt%, institute
The content for stating rheology adjusting control agent is 2-4wt%, and the content of the toughener is 0.8-1.5wt%.
3. GEL USED FOR PLUGGING WELL LOST CIRCULATION according to claim 1 or 2, wherein the polymer compound monomer is acrylamide, 2- third
Acrylamide -2- methyl propane sulfonic acid, vinylacetate, methyl acrylate, styrene, two kinds or two kinds in methyl methacrylate
More than；
The solid phase organic macromolecule crosslinking agent is the crosslinking agent of active C=C double bond group；
The initiator is oxidation-reduction initiator；Preferably, the oxidation-reduction initiator includes Oxidizing and Reducing Agents,
Wherein, oxidant is potassium peroxydisulfate and/or ammonium persulfate, and reducing agent is sodium hydrogensulfite and/or sodium sulfite；Oxidant with also
The mass ratio of former agent is (0.5-1): 1；Preferably, the mass ratio of oxidant and reducing agent is (0.8-1): 1；
The rheology adjusting control agent includes double-metal hydroxide and nanoparticle；Wherein, double-metal hydroxide and nanoparticle
Mass ratio be (2-6): 1；Preferably, the mass ratio of double-metal hydroxide and nanoparticle is (3-5): 1；
Preferably, the double-metal hydroxide is that magnalium double-metal hydroxide, silicon magnesium double-metal hydroxide and lithium magnesium are double
One or both of metal hydroxides；The nanoparticle is hydrophily gas phase nano SiO2；
The toughener is one of polypropylene fibre, Fypro and polyester fiber or a variety of.
4. GEL USED FOR PLUGGING WELL LOST CIRCULATION described in any one of -3 according to claim 1, wherein the solid phase organic macromolecule crosslinking agent
It is made by following steps:
(1) reactive monomer and the second initiator are dissolved separately in deionized water, obtain solution A 1 and A2；
(2) lipophilic, hydrophilic emulsifier and oil phase solvent are stirred evenly, obtains solution B；
(3) solution A 1 is slowly added dropwise into the solution B, obtains solution C after mixing evenly；
(4) solution A 2 is slowly added dropwise into the solution C and is stirred evenly, under certain temperature, after standing reaction, obtained micro-
Lotion D；
(5) organic crosslinking agent is added in the microemulsion D, and obtains microemulsion F after adjusting pH to faintly acid；
(6) precipitating reagent is mixed with the microemulsion F, solid matter is precipitated, it is dry after washed dose of washing, obtain the solid phase
Organic macromolecule crosslinking agent.
5. GEL USED FOR PLUGGING WELL LOST CIRCULATION according to claim 4, wherein on the basis of the total weight of microemulsion D, the reactivity is single
The dosage of body is 2-7wt%, and the dosage of second initiator is 0.05-0.4wt%, and the dosage of the oleophilic emulsifier is 4-
10wt%, the dosage of the hydrophilic emulsifying agent are 8-18wt%, and the dosage of the oil phase solvent is 45-70wt%, described organic
The dosage of crosslinking agent is 1-3.5wt%；
It is highly preferred that the dosage of the reactive monomer is 3-6wt%, and described second draws on the basis of the total weight of microemulsion D
The dosage for sending out agent is 0.1-0.3wt%, and the dosage of the oleophilic emulsifier is 5-8wt%, and the dosage of the hydrophilic emulsifying agent is
10-15wt%, the dosage of the oil phase solvent are 50-65wt%, and the dosage of the organic crosslinking agent is 1.5-3wt%.
6. GEL USED FOR PLUGGING WELL LOST CIRCULATION according to claim 4 or 5, wherein the reactive monomer is acrylamide, metering system
One of acid and vinyl pyrrolidone are a variety of；
Second initiator is potassium peroxydisulfate and/or ammonium persulfate；
The oil emulsifier is the mixture of Span60 and Span80；
The hydrophilic emulsifier is the mixture of Tween60 and Tween80；
The oil phase solvent is at least one of hexamethylene, kerosene and atoleine；
The organic crosslinking agent is N,N methylene bis acrylamide and/or N hydroxymethyl acrylamide；
Preferably, the mass ratio of the Span60 and Span80 is (0.2-0.6): 1；The quality of the Tween60 and Tween80
Than for (1-4): 1；
It is highly preferred that the mass ratio of the Span60 and Span80 is (0.3-0.5): 1；The matter of the Tween60 and Tween80
Amount is than being (1.5-2.5): 1.
7. GEL USED FOR PLUGGING WELL LOST CIRCULATION according to any one of claims 4 to 6, wherein alkaline condition described in step (1)
PH value is 8-10；
Temperature described in step (4) is 50-70 DEG C；
PH value is 4-6, reaction time 2-6h in step (5)；
Precipitating reagent described in step (6) is dehydrated alcohol；The detergent is one of dehydrated alcohol and/or acetone.
8. the preparation method of shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION described in a kind of claim 1-7 any one, comprising the following steps:
(I) polymer compound monomer, solid phase organic macromolecule crosslinking agent are added in clear water, with the first mixing speed stir to
It is completely dissolved, obtains the mixed liquor a；
(II) rheology adjusting control agent is added in the mixed liquor a, is stirred with the second mixing speed to being uniformly dispersed, obtains mixed liquor
b；
(III) toughener is added in the mixed liquor b, is stirred with third mixing speed to being uniformly dispersed, obtain mixed liquor c；
(IV) initiator is added in the mixed liquor c, is stirred with the 4th mixing speed to being completely dissolved, obtain mixed liquor d；
(V) by mixed liquor d sealing and standing, solidification plastic is carried out, obtains the shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION.
9. preparation method according to claim 8, wherein the first mixing speed is 500-1000 revs/min, preferably
600-800 revs/min；Second mixing speed is 300-500 revs/min, preferably 350-450 revs/min；Third mixing speed
It is 50-150 revs/min, preferably 80-120 revs/min；4th mixing speed is 50-150 revs/min, preferably 80-120
Rev/min；In the step (III), dwell temperature is 25-150 DEG C, and solidification gelation time is 1-5h.
10. shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION described in a kind of claim 1-7 any one or as described in claim 8 or 9
The application of shear loading type GEL USED FOR PLUGGING WELL LOST CIRCULATION is prepared in method, wherein the application is drilling fluid leak stopping.
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| CN115746195A (en) * | 2022-11-13 | 2023-03-07 | 中国石油大学(北京) | Microgel plugging agent for self-repairing of water drilling fluid, preparation method thereof and drilling fluid containing microgel plugging agent |
| CN115746195B (en) * | 2022-11-13 | 2023-11-24 | 中国石油大学(北京) | Self-repairing microgel plugging agent for water drilling fluid, preparation method thereof and drilling fluid containing microgel plugging agent |
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