CN109666464A - A kind of drilling fluid closure type polymer filtrate reducer and preparation method thereof and drilling fluid - Google Patents
A kind of drilling fluid closure type polymer filtrate reducer and preparation method thereof and drilling fluid Download PDFInfo
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- CN109666464A CN109666464A CN201710966185.5A CN201710966185A CN109666464A CN 109666464 A CN109666464 A CN 109666464A CN 201710966185 A CN201710966185 A CN 201710966185A CN 109666464 A CN109666464 A CN 109666464A
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- drilling fluid
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
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Abstract
The present invention provides a kind of drilling fluid preparation methods of closure type polymer filtrate reducer, comprising: by water, 2- acrylamide-2-methylpro panesulfonic acid, alkyl acrylamide, acrylamide, N, N- methylene-bisacrylamide and emulsifier mixing obtain water phase；White oil, divinylbenzene and emulsifier are mixed, oily phase is obtained；Water phase is added in oily phase and is emulsified, mixture lotion is obtained；Mixture lotion is reacted under the action of initiator, obtains reaction product；Reaction product and emulsifier are mixed, drilling fluid closure type polymer filtrate reducer is obtained.Method provided by the invention is prepared for the drilling fluid closure type polymer filtrate reducer of inside and outside cross-linked structure, solves the problems, such as that high temperature is difficult to control without clay phase drilling fluid filtration.The present invention also provides a kind of drilling fluid closure type polymer filtrate reducers and drilling fluid.
Description
Technical field
The present invention relates to oilfield chemistry additive for drilling fluid technical fields more particularly to a kind of drilling fluid closure type to polymerize
Object fluid loss additive and preparation method thereof and drilling fluid.
Background technique
As petroleum exploration and development develops to deep, deep-well and special well are more and more, no clay phase wellbore fluid
Because being free of clay, subparticle solid concentration is low for system, is conducive to improve rate of penetration.Compared with water base bentonite drilling fluid, nothing
Clay phase drilling fluid has not to be limited by clay, and it is big to improve drilling fluid inhibition space；Gained filter cake is degradable, is easy to counter and arranges,
It is low to formation damage；Solid concentration is low, and lubricity is good, cyclic pressure dissipation is low；Solid content is big, and anti-drilling bits pollution capacity is strong, highly dense
The advantages that rheological characteristic is easily controllable under the conditions of degree.
But it is difficult because Filtrate Loss Control under fine and close filter cake, high temperature without slope soil, can not be formed without clay phase drilling fluid, especially
It is temperature resistance up to 150 DEG C without clay phase drilling fluid, there is no dedicated filtrate reducing inorganic agents at present.Currently, drilling fluid routinely drop filter
Losing agent is mainly carboxymethyl cellulose, humic acid and its derivative, resinae fluid loss additive, modified starch, acrylamide polymer
Object etc. is closed, these fluid loss additives and clay effect can effectively control filter loss, be difficult to play work in the case where no clay
With.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of drilling fluid closure type polymer filtrate reducers and its preparation
Method and drilling fluid, fluid loss additive provided by the invention can be used for no clay drilling fluid.
The present invention provides a kind of drilling fluid closure type polymer filtrate reducers, by including water, 2- acrylamido -2-
Methyl propane sulfonic acid, alkyl acrylamide, acrylamide, N,N methylene bis acrylamide, divinylbenzene, white oil, emulsifier
It is prepared with the material of initiator by inverse emulsion polymerization.
In the present invention, drilling fluid is preferably 0.5~5.0 μm with the partial size of closure type polymer filtrate reducer, more preferably
It is 1~4 μm, most preferably 2~3 μm.
In the present invention, the preparation method of drilling fluid closure type polymer filtrate reducer, comprising the following steps:
(1) by water, 2- acrylamide-2-methylpro panesulfonic acid, alkyl acrylamide, acrylamide, N, N- di-2-ethylhexylphosphine oxide
Acrylamide and emulsifier mixing, obtain water phase；
(2) white oil, divinylbenzene and emulsifier are mixed, obtains oily phase；
(3) water phase is added in oily phase and is emulsified, obtain mixture lotion；
(4) mixture lotion is reacted under the action of initiator, obtains reaction product；
(5) reaction product and emulsifier are mixed, obtains drilling fluid closure type polymer filtrate reducer.
In the present invention, water, 2- acrylamide-2-methylpro panesulfonic acid, alkyl acrylamide, acryloyl in step (1)
The mass ratio of amine, N,N methylene bis acrylamide and emulsifier is preferably (58.2~88): (17~52): (3~10): (7~
30): (0.2~1.4): (0.757~2.270), more preferably (65~80): (25~45): (5~8): (10~25): (0.5
~1): (1~2), most preferably (70~75): (30~40): (6~7): (15~20): (0.6~0.7): (1.4~1.6).
In the present invention, the emulsifier in step (1) is preferably Tween-80 or OP-10.
In the present invention, the alkyl acrylamide in step (1) is preferably N,N-DMAA, N, N- diethyl
Acrylamide or N-tert-butyl acrylamide.
In the present invention, the pH value of water phase is preferably 7.0~9 in step (1), and more preferably 7.5~8.5, most preferably
8。
In the present invention, the mass ratio of white oil, divinylbenzene and emulsifier is preferably (58.2~88) in step (2):
(0.2~1.4): (2.852~6.809), more preferably (65~80): (0.5~1): (3~6), most preferably (70~75):
(0.7~0.8): (4~5).In the present invention, emulsifier is preferably sorbester p17 in step (2).
In the present invention, emulsification is preferably that high speed emulsifies in step (3), and emulsifying rate is preferably 10000~20000r/
min；Emulsification times are preferably 20~30min, more preferably 25min.
In the present invention, the temperature reacted in step (4) is preferably 25~35 DEG C, and more preferably 30 DEG C；Reaction preferably exists
It is carried out under vacuum condition；Reaction preferably carries out under logical condition of nitrogen gas；Vacuumize, the time of logical nitrogen is preferably 15~30min,
More preferably 20~25min；The time of reaction is preferably 5~15h, more preferably 10h.
In the present invention, the initiator in step (4) preferably includes sulphite, persulfate initiator and azo initiation
Agent；The mass ratio of sulphite, persulfate initiator and azo initiator is preferably (0.01~0.07): (0.01~
0.07): (0.01~0.03), more preferably (0.02~0.06): (0.02~0.06): (0.015~0.025), most preferably
(0.03~0.05): (0.03~0.05): 0.025.
In the present invention, sulphite is preferably sodium hydrogensulfite, sodium pyrosulfite, sodium sulfite or sodium thiosulfate；
Persulfate initiator is preferably ammonium persulfate or potassium peroxydisulfate；Azo initiator is preferably water-soluble azo initiator, more excellent
It is selected as two isobutyl quinoline hydrochloride of azo, azo diisobutyl amidine hydrochloride, azo dicyano valeric acid or azo diisopropyl imidazoles
Quinoline.
In the present invention, the temperature mixed in step (5) is preferably shorter than 35 DEG C.In the present invention, the emulsification in step (5)
Agent is preferably OP-15.
In the present invention, drilling fluid preferably includes following steps with the preparation method of closure type polymer filtrate reducer:
(A1) 58.2~88 mass parts water are added in preparing tank, opens stirring and 17~52 mass parts 2- acrylamides is added
Base -2- methyl propane sulfonic acid, 3~10 mass parts alkyl acrylamides, 7~30 mass parts acrylamides, 0.2~1.4 mass parts N,
N- methylene-bisacrylamide, 0.757~2.270 mass parts Tween-80 emulsifier or OP-10 are stirred to fully dissolved, are then adjusted
Saving mixed system pH is 7.0~9, obtains water phase；
(A2) 58.2~88 mass parts white oils, 0.2~1.4 mass parts divinylbenzene and 2.852 are added in a kettle
~6.809 mass parts sorbester p17 emulsifiers, stirring to fully dissolved obtain oily phase；
(A3) under agitation, step (1) resulting water phase is slowly added into the resulting oily phase of step (2), sufficiently
After stirring, high speed emulsifies 20~30min, obtains mixture lotion；
(A4) the resulting mixture lotion of step (3) is put into reaction kettle, opens blender, is warming up to 25~35 DEG C,
It vacuumizes, logical 15~30min of nitrogen, sequentially adds sulphite, 0.01~0.07 part of persulfuric acid of 0.01~0.07 mass parts
Salt initiators, 0.01~0.03 mass of water-soluble azo initiator reduce mixing speed after mixing evenly, react 5~15h,
Obtain reaction product；
(A5) at making the temperature of reaction system drop to 35 DEG C hereinafter, to reaction product after the reaction of above-mentioned steps (4) is complete
0.2~1.5 mass parts OP-15 of middle addition, blowing, obtains drilling fluid closure type polymer filtrate reducer after mixing evenly.
The present invention provides a kind of drilling fluids, are dropped and are filtered with closure type polymer including drilling fluid described in above-mentioned technical proposal
Lose the drilling fluid closure type polymer filtrate reducer that method described in agent or above-mentioned technical proposal is prepared.The present invention is to brill
Other compositions in feed liquor do not have special limitation, and drilling fluid is preferably without clay phase drilling fluid.In the present invention, drilling fluid is excellent
Choosing includes:
Water mentions sticking and cuts agent, drilling fluid closure type polymer filtrate reducer, polymer inhibitor, NaOH, KCl and weight crystalline substance
Stone.
Mention it is glutinous to cut mass content of the agent in drilling fluid be preferably 1~2%, more preferably 1.2~1.8%, most preferably
1.4~1.6%.The present invention does not have special limitation to the glutinous type for cutting agent and source of mentioning, it is preferred to use CN
Weak Gels disclosed in 104140791A patent, which mention sticking, cuts agent.
In the present invention, drilling fluid is the envelope of drilling fluid described in above-mentioned technical proposal with closure type polymer filtrate reducer
The drilling fluid that method described in stifled type polymer filtrate reducer or above-mentioned technical proposal is prepared is dropped with closure type polymer to be filtered
Agent is lost, details are not described herein.
In the present invention, drilling fluid is preferably 0.5 with mass content of the closure type polymer filtrate reducer in drilling fluid
~1%, more preferably 0.6~0.9%, most preferably 0.7~0.8%.
Mass content of the polymer inhibitor in drilling fluid is preferably 0.3~0.5%, and more preferably 0.4%.The present invention
Type and source to the polymer inhibitor do not have special limitation, it is preferred to use specially application No. is 201310517150.5
Without clay phase polymer for drilling fluid inhibitor disclosed in benefit.
In the present invention, mass content of the NaOH in drilling fluid is preferably 0.2~0.5%, more preferably 0.3~
0.4%.
In the present invention, mass content of the KCl in drilling fluid is preferably 5%~10%.
The present invention does not have special limitation to the dosage of barite, and those skilled in the art can be according to actually required drilling well
The dosage of the density adjustment barite of liquid.
Fluid loss additive in the prior art controls difficult, temperature resistance deficiency for no clay phase drilling fluid filtration, can not shape
At fine and close filter cake, method provided by the invention is prepared for the drilling fluid closure type polymer filtrate reducing of inside and outside cross-linked structure
Agent improves the structural strength of cross-linked network, has delayed the swelling time, has reduced high temperature and high pressure filter loss, has reached physics drop
The purpose of low leak-off solves the problems, such as that high temperature is difficult to control without clay phase drilling fluid filtration.In addition, brill provided by the invention
The preparation method of well liquid closure type polymer filtrate reducer, simple process, operating procedure are simple.
Compared with prior art, partial size, which has been prepared, in method provided by the invention has some strength at 0.5~5.0 μm
Deformable temperature resistance microgel particle fluid loss additive, this fluid loss additive be inside and outside crosslinking method, improve the knot of microgel particle
Structure intensity can delay the swelling time.Raw material used by method provided by the invention is industrial goods, is not required to carry out before reaction
Purification processes by vacuumizing, lead to nitrogen deoxygenation, are caused by initiator and polymerize, and preparation process is simple.What the present invention was prepared
Drilling fluid is strong with the temperature resistance ability of closure type polymer filtrate reducer, especially can be resistant to 170 DEG C or more high temperature, and high temperature is suitble to bore
Well liquid system, especially without clay phase drilling fluid, the cross-linked network of this closure type fluid loss additive is gradually unfolded, can block micro-
Crack, barrier pressure transmitting, reduces drilling fluid high-temperature high pressure filter loss.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff it is improved or retouching all other example, shall fall within the protection scope of the present invention.
Raw material used in following embodiment of the present invention is commercial goods.
Embodiment 1
The water of addition 58.2Kg in preparing tank, the 2- acrylamide-2-methylpro panesulfonic acid of unlatching stirring addition 17Kg,
The N of 10Kg, N- dimethylacrylamide, the acrylamide of 7Kg, the N,N methylene bis acrylamide of 0.2Kg, 0.757Kg are spat
Temperature -80, stirring to fully dissolved, then adjusting mixed system pH value is 7.0~9, obtains water phase；
White oil, the divinylbenzene of 1.4Kg and the sorbester p17 emulsifier of 6.809Kg of 88Kg are added in a kettle, stirs
It mixes to fully dissolved and obtains oily phase；
Water phase is slowly added into oily phase under agitation, stirs 30min, high speed emulsifies 20min, obtains mixing cream
Liquid；
Above-mentioned mixed emulsion is put into reaction kettle, blender is opened, is warming up to 35 DEG C, vacuumize, logical nitrogen 15~
30min sequentially adds the two isobutyl quinoline hydrochloride of azo of the sodium hydrogensulfite of 0.07Kg, the ammonium persulfate of 0.07Kg, 0.01Kg,
Mixing speed is reduced after stirring 10min, 5h is reacted, obtains reaction product；
Temperature drops to 25 DEG C after the reaction was completed, and the OP-15 of 0.2Kg is added into reaction product, stirs 30min blowing,
Obtain drilling fluid closure type polymer filtrate reducer.
Embodiment 2
The water of addition 88Kg in preparing tank, the 2- acrylamide-2-methylpro panesulfonic acid of unlatching stirring addition 52Kg,
The N of 3Kg, N- acrylamide, the acrylamide of 30Kg, the N,N methylene bis acrylamide of 1.4Kg, 2.27Kg cream
Agent OP-10, stirring to fully dissolved, then adjusting mixed system pH is 7.0~9, obtains water phase；
White oil, the divinylbenzene of 0.2Kg and the sorbester p17 emulsifier of 2.852Kg of 58.2Kg are added in a kettle,
Stirring to fully dissolved obtains oily phase；
Water phase is slowly added into oily phase under agitation, stirs 30min, high speed emulsifies 20min, obtains mixture cream
Liquid；
Mixture lotion is put into reaction kettle, blender is opened, is warming up to 25 DEG C, vacuumize, logical nitrogen 15~
30min sequentially adds the azo diisobutyl amidine hydrochloric acid of the sodium pyrosulfite of 0.01Kg, the potassium peroxydisulfate of 0.01Kg, 0.02Kg
Salt reduces mixing speed after stirring 10min, reacts 15h, obtain reaction product；
Temperature drops to 25 DEG C after the reaction was completed, and the OP-15 of 1.5Kg is added, and stirs 30min blowing, obtains drilling fluid use
Closure type polymer filtrate reducer.
Embodiment 3
The water of 77Kg is added in preparing tank, opens the 2- acrylamido -2- methyl-prop sulphur that 39.62Kg is added in stirring
Acid, the N-tert-butyl acrylamide of 5Kg, the acrylamide of 15.38Kg, the N,N methylene bis acrylamide of 0.6Kg, 0.756Kg
Tween-80 emulsifier, to fully dissolved, then adjusting mixed system pH is 7.0~9 for stirring, obtains water phase；
White oil, the divinylbenzene of 0.6Kg and the sorbester p17 emulsifier of 6.804Kg of 63.0Kg are added in a kettle,
Stirring to fully dissolved obtains oily phase；
Water phase is slowly added into oily phase under agitation, stirs 30min, high speed emulsifies 20min, obtains mixture cream
Liquid；
Said mixture lotion is put into reaction kettle, blender is opened, is warming up to 30 DEG C, vacuumize, logical nitrogen 15~
30min sequentially adds the azo dicyano valeric acid of the sodium sulfite of 0.02Kg, the ammonium persulfate of 0.02Kg, 0.03Kg, stirring
Mixing speed is reduced after 10min, is reacted 15h, is obtained reaction product；
Temperature drops to 30 DEG C after the reaction was completed, and the OP-15 of 1.5Kg is added, and stirs 30min blowing, obtains drilling fluid use
Closure type polymer filtrate reducer.
Embodiment 4
The water of 79.75Kg is added in preparing tank, opens the 2- acrylamido -2- methyl-prop that 36.32Kg is added in stirring
The N of sulfonic acid, 8.68Kg, N- dimethylacrylamide, the acrylamide of 10Kg, 0.55Kg N,N methylene bis acrylamide,
The emulsifier op-10 of 0.78Kg, stirring to fully dissolved, then adjusting mixed system pH is 7.0~9, obtains water phase；
White oil, the divinylbenzene of 0.55Kg and the sorbester p17 emulsifier of 7.02Kg of 65.0Kg are added in a kettle,
Stirring to fully dissolved obtains oily phase；
Water phase is slowly added into oily phase under agitation, stirs 30min, high speed emulsifies 20min, obtains mixture cream
Liquid；
Said mixture lotion is put into reaction kettle, blender is opened, is warming up to 30 DEG C, vacuumize, logical nitrogen 15~
30min sequentially adds the azo dicyclohexyl formonitrile HCN of the sodium hydrogensulfite of 0.03Kg, the ammonium persulfate of 0.03Kg, 0.02Kg,
Mixing speed is reduced after stirring 10min, 15h is reacted, obtains reaction product；
Temperature drops to 30 DEG C after the reaction was completed, and the OP-15 of 1.5Kg is added, and stirs 30min blowing, obtains drilling fluid use
Closure type polymer filtrate reducer.
Embodiment 5
The water of 77Kg is added in preparing tank, opens the 2- acrylamido -2- methyl-prop sulphur that 39.62Kg is added in stirring
Acid, 5Kg N, N- acrylamide, the acrylamide of 15.38Kg, 0.6Kg N,N methylene bis acrylamide,
The Tween-80 emulsifier of 1.64Kg, stirring to fully dissolved, then adjusting mixed system pH is 7.0~9, obtains water phase；
White oil, the divinylbenzene of 0.6Kg and the sorbester p17 emulsifier of 6.552Kg of 63.0Kg are added in a kettle,
Stirring to fully dissolved obtains oily phase；
Water phase is slowly added into oily phase under agitation, stirs 30min, high speed emulsifies 20min, obtains mixture cream
Liquid；
Said mixture lotion is put into reaction kettle, blender is opened, is warming up to 30 DEG C, vacuumize, logical nitrogen 15~
30min sequentially adds the two isobutyl quinoline hydrochloric acid of azo of the sodium hydrogensulfite of 0.02Kg, the persulfate ammonium of 0.02Kg, 0.03Kg
Salt reduces mixing speed after stirring 10min, reacts 15h, obtain reaction product；
Temperature drops to 30 DEG C after the reaction was completed, and the polyoxyethylene nonylphenol ether -15 of 1.52Kg is added, and stirs 30min blowing, is bored
Well liquid closure type polymer filtrate reducer.
Embodiment 6
After the drilling fluid that Examples 1 to 5 is prepared is washed with closure type polymer filtrate reducer with dehydrated alcohol
After the powder arrived is sufficiently dried, stick on conductive paper, then surface metal spraying observes drilling fluid at scanning electron microscope SEM
With the micromorphology of closure type polymer filtrate reducer, testing result is the drilling fluid envelope that the embodiment of the present invention is prepared
For stifled type polymer filtrate reducer in spherical, it is 5 μm that wherein partial size is biggish, about 0.5 μm lesser, concrete outcome referring to table 1,
Table 1 is the drilling fluid closure type polymer filtrate reducer partial size that the embodiment of the present invention is prepared and filtrate loss controllability detection
As a result, filtrate loss controllability is referring to GB/T 16783.1-2006 " industrial gas oil drilling fluid on-the-spot test part 1: water base
Drilling fluid " standard detection, the ingredient of drilling fluid are as follows:
The polymer for mentioning the glutinous closure polymer filtrate reducer+0.4wt% for cutting agent+0.8wt% of water+1.5wt% inhibits
The KCl+ barite of the NaOH+7wt% of agent+0.3wt% (barite amount is determined according to density).
Mention it is glutinous cut agent the preparation method comprises the following steps:
117mL water is added in a reservoir, 2- acrylamide-2-methylpro panesulfonic acid, the 38g of 42g is added in turn on agitator
Acrylamide, the N,N-DMAA of 20g, 0.1g N, the Tween 80 of N- methylene-bisacrylamide, 1.5g stirs
It mixes until dissolution, the pH value 9.0 of control system obtain required dispersed phase；117mL5# white oil, 6.14g sapn are added in a reservoir
80, stirring is until dissolution forms continuous phase；Resulting dispersed phase is added slowly with stirring in continuous phase, then in emulsifying kettle
In 10min is sufficiently stirred, obtain reversed-phase emulsion；Gained reversed-phase emulsion is put into equipped with blender, addition funnel, logical nitrogen tube, temperature
It spends in the reaction vessel of meter, is passed through nitrogen 30min, while bath temperature is risen to 50 DEG C, 10% mistake of mass fraction is slowly added dropwise
Ammonium sulfate solution 0.1g, 10% aqueous solution of sodium bisulfite 0.1g stop stirring after stirring 20min, continue logical nitrogen
20min is stood, and is reacted 5h, is obtained thick milky latex, is mentioned sticking for Weak Gels and is cut agent.
The preparation method of polymer inhibitor:
The acrylamide of 36g, the N of 20g, the N- vinyl -2- pyrrole of N- dimethylacrylamide, 25g are added in 100g water
Pyrrolidone, 19g dimethyl diallyl ammonium chloride adjust pH value after completely dissolution to 9, be separately added into the ammonium persulfate of 0.2g
With the sodium hydrogensulfite of 0.2g, reaction time 0.5~1 hour at 30 DEG C obtains gelatinous polymer, and product is clipped, makes
Grain is dried at 60 DEG C, is crushed, obtains no clay phase polymer for drilling fluid inhibitor.
The drilling fluid that 1 embodiment of the present invention of table is prepared with closure type polymer filtrate reducer partial size with
And filtrate loss controllability testing result
Referring to GB/T 16783.1-2006 " industrial gas oil drilling fluid on-the-spot test part 1: water-base drilling fluid "
Standard, the drilling fluid prepared according to above-mentioned drilling fluid composition detection embodiment 1 are steady with the high temperature of closure type polymer filtrate reducer
Qualitative (170 DEG C, 7wt%KCl), testing result is as shown in table 2, and table 2 is the drilling fluid envelope that the embodiment of the present invention 1 is prepared
The high-temperature stability of stifled type polymer filtrate reducer.
The high temperature for the drilling fluid closure type polymer filtrate reducer that 2 embodiment of the present invention 1 of table is prepared
Stability (170 DEG C, 7wt%KCl)
AV is apparent viscosity, and PV is plastic viscosity, and YP is yield value, and YP/PV is ratio of dynamic shear force/yield value to plastic viscosity, and Gel is just/10-minute gel strength, Fl
For API filtration, 150 DEG C of HTHP are high temperature and pressure leak-off.
The high-temperature stability of the drilling fluid that embodiment 2~5 is prepared in present invention closure type polymer filtrate reducer
The drilling fluid prepared with embodiment 1 is close with closure type polymer filtrate reducer performance.
By Tables 1 and 2 it is found that the drilling fluid that the present invention is prepared is with the partial size of closure type polymer filtrate reducer
0.5~5.0 μm, the filter loss after 150 DEG C/16 agings is less than 5mL, in no clay phase drilling fluid after continuous ageing 72h, 170
The control of DEG C high temperature and high pressure filter loss has within 15.0mL and preferable blocks filtrate reducing ability.
What has been described above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill of the art
For personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of drilling fluid preparation method of closure type polymer filtrate reducer, comprising the following steps:
(1) by water, 2- acrylamide-2-methylpro panesulfonic acid, alkyl acrylamide, acrylamide, N, N- methylene bisacrylamide
Amide and emulsifier mixing, obtain water phase；
(2) white oil, divinylbenzene and emulsifier are mixed, obtains oily phase；
(3) water phase is added in oily phase and is emulsified, obtain mixture lotion；
(4) mixture lotion is reacted under the action of initiator, obtains reaction product；
(5) reaction product and emulsifier are mixed, obtains drilling fluid closure type polymer filtrate reducer.
2. the method according to claim 1, wherein the alkyl acrylamide in the step (1) is N, N- bis-
Methacrylamide, N, N- acrylamide or N-tert-butyl acrylamide.
3. the method according to claim 1, wherein the pH value of water phase is 7.0~9 in the step (1).
4. the method according to claim 1, wherein the time emulsified in the step (3) is 20~30min.
5. the method according to claim 1, wherein the temperature reacted in the step (4) is 25~35 DEG C；Instead
The time answered is 5~15h.
6. the method according to claim 1, wherein the initiator in the step (4) includes sulphite, mistake
Persulfate initiator and azo initiator.
7. according to the method described in claim 6, it is characterized in that, the sulphite, persulfate initiator and azo draw
The mass ratio for sending out agent is (0.01~0.07): (0.01~0.07): (0.01~0.03).
8. according to the method described in claim 6, it is characterized in that, the sulphite be sodium hydrogensulfite, sodium pyrosulfite,
Sodium sulfite or sodium thiosulfate；
The persulfate initiator is ammonium persulfate or potassium peroxydisulfate；
The azo initiator be two isobutyl quinoline hydrochloride of azo, azo diisobutyl amidine hydrochloride, azo dicyano valeric acid or
Azo dicyclohexyl formonitrile HCN.
9. a kind of drilling fluid closure type polymer filtrate reducer, by including water, 2- acrylamide-2-methylpro panesulfonic acid, alkane
Base acrylamide, acrylamide, N,N methylene bis acrylamide, divinylbenzene, white oil, emulsifier and initiator material
It is prepared by inverse emulsion polymerization.
10. a kind of drilling fluid is blocked including the drilling fluid that method described in any one of claim 1~8 is prepared
Type polymer filtrate reducer or drilling fluid as claimed in claim 9 closure type polymer filtrate reducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710966185.5A CN109666464B (en) | 2017-10-17 | 2017-10-17 | Plugging polymer filtrate reducer for drilling fluid, preparation method of plugging polymer filtrate reducer and drilling fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710966185.5A CN109666464B (en) | 2017-10-17 | 2017-10-17 | Plugging polymer filtrate reducer for drilling fluid, preparation method of plugging polymer filtrate reducer and drilling fluid |
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| CN111285964A (en) * | 2020-03-10 | 2020-06-16 | 长江大学 | Temperature-resistant and salt-resistant micro-crosslinked fluid loss additive for drilling fluid and preparation method thereof |
| CN111875758A (en) * | 2020-08-11 | 2020-11-03 | 中国石油大学(华东) | Preparation method of environment-friendly ultra-high temperature resistant filtrate reducer for water-based drilling fluid |
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| CN115746197A (en) * | 2021-09-02 | 2023-03-07 | 中石化石油工程技术服务有限公司 | Double-crosslinked polymer microsphere plugging agent for oil-based drilling fluid and preparation method thereof |
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| CN115746197A (en) * | 2021-09-02 | 2023-03-07 | 中石化石油工程技术服务有限公司 | Double-crosslinked polymer microsphere plugging agent for oil-based drilling fluid and preparation method thereof |
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