CN104559964B - Shearing-force increase and filtrate loss reduction agent for drilling fluid and preparation method thereof - Google Patents
Shearing-force increase and filtrate loss reduction agent for drilling fluid and preparation method thereof Download PDFInfo
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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
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
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Abstract
The invention relates to a shearing-force increase and filtrate loss reduction agent for drilling fluid and a preparation method thereof. The shearing-force increase and filtrate loss reduction agent for drilling fluid is prepared with a method as follows: cross-linked starch, modified natural fiber and biological glue are subjected to graft copolymerization with comonomer under the action of an initiating agent A, wherein with the weight of the cross-linked starch as a reference, the weight fraction of other raw materials is as follows: biological glue accounts for 10-35%, natural fiber accounts for 10-35%, a basifier accounts for 2-8%, sodium chloroacetate accounts for 1-5%, epoxy chloropropane accounts for 0.5-3%, comonomer account for 20-60%, and the initiating agent accounts for 0.5-2%. The shearing-force increase and filtrate loss reduction agent for the drilling fluid can scientifically adjust apparent viscosity and static shearing force of the drilling fluid, has good filtrate loss reduction performance and shearing-force increase performance and is good in salt-resistant and temperature-resistant effect.
Description
Technical field
The invention belongs to oil field drilling fluids used additives technical field, and in particular to a kind of drilling fluid with carry cut fluid loss additive and
Its preparation method.
Background technology
In drilling process, the addition of additive for drilling fluid is to ensure the necessary condition that drilling process is smoothed out.Nowadays,
With the swift and violent increase of World's Oil and Gas Resources demand, oil drilling technology is continued to develop, and drilling strata is increasingly sophisticated, level
Well, extended reach well quantity are increased sharply, and the technology such as deepwater drilling, Solid Free drilling well is developed rapidly.During deepwater drilling, well
Temperature and change in flow are larger between marine riser, and the rheological property of drilling fluid system easily fluctuates, the increase of well control difficulty, especially
It is that requirement higher is proposed to filtrate loss controllability and solid-carrying performance.The density of clay-free drilling fluid is low, lubrication, cooling performance
It is good, be conducive to improving drilling speed and reducing leakage that drill bit efficient rock-breaking ability can be greatly improved, bit life, therefore application can be improved
It is more and more wider；But there is the shortcomings of dehydration is big, and large rock-carrying ability is poor in it.Extended reach well can make full use of existing platform or continental rise
Marginal field development and offshore oil and gas field, are together in series many oil-gas reservoirs, can save the expense section of a large amount of repeated construction
Investment-saving；But extended reach well has the horizontal segment of big section, horizontal segment is required very the prop-carrying capacity and suspendability of mud
It is high.
These advanced drilling technologies are developed rapidly, and this just proposes higher and higher requirement to Drilling Fluid.Drilling well
The shear force of liquid is small, and suspension is poor, takes sand difficulty, directly affects barite sedimentation, equivalent circulating density, surge pressure and suction pressure
Power etc., easily causes the adverse consequences such as desilting bit freezing；Therefore, the addition of extracting and cutting agent can be complicated through boring with suitable control shear force
Well successfully ensures.Fluid loss additive by the borehole wall formed low-permeability, thin and compact filter cake and reduce the leak-off of drilling fluid
Measure, so as to avoid irregular hole diameter, hole collapse, damage oil-gas Layer, bit freezing and the undesirable condition generation such as inaccurate of logging well.
Current oil field drilling fluids extracting and cutting agent is maximum with xanthans consumption, but it can be significantly while shear force is improved
Apparent viscosity is improved, the maintenance to drilling fluid brings difficulty.But possess good temperature resistance salt-resistance, drilling fluid can be improved
Suspension and take grittiness will not greatly improve again drilling fluid apparent viscosity product it is little.Therefore, need to develop at present to carry
Cut ability it is strong and drilling fluid apparent viscosity is not significantly increased, while having certain filtrate loss controllability and heat and salinity tolerance effect good
Extracting and cutting agent product is come the need for the maintenance and treatment that meet current live drilling fluid.
The content of the invention
For defect present in prior art, filtrate reducing is cut with carrying it is an object of the present invention to provide a kind of drilling fluid
Agent, the drilling fluid is cut fluid loss additive there is good carrying to cut performance and filtrate loss controllability with carrying, and saline-alkaline tolerance is strong, temperature resistance effect
It is good.
It is a further object to provide a kind of drilling fluid with the preparation method of cutting fluid loss additive is put forward, the method should
Method rational technology, it is mild condition, controllable, without post processing.
To achieve the above objectives, the technical solution adopted by the present invention is：Drilling fluid cuts fluid loss additive with carrying, by crosslinked starch
Graft copolymerization is carried out with comonomer with modified natural fiber and biogum in the presence of initiator A to be obtained, wherein, with
On the basis of crosslinked starch weight, the weight fraction of other each raw materials is,
Further, the crosslinked starch is prepared using following methods：
(1) each raw material comprising starch, on the basis of raw starch weight, the weight fraction of other each raw materials are weighed
For：
(2) starch, organic solvent and cushioning liquid are added in reactor R2 by proportioning, while having the ratio
Organic phosphonates are made into the organic phospho acid saline solution of 25~30wt%, are also added in reactor R2, heat up and maintain the temperature at
Between 40~60 DEG C, 0.5~1h of stirring reaction；
(3) basifier of the ratio is dissolved in water, is made 45~50wt% basifier aqueous solution, and basifier is water-soluble
Liquid is added in reactor R2, maintains the temperature at 60~90 DEG C, is stirred 20~30 minutes；
(4) sodium chloroacetate of the ratio is dissolved in water, is made 20~30wt% sodium chloroacetate aqueous solution, and by monoxone
Sodium water solution is added in reactor R2, is maintained the temperature between 60~90 DEG C, 1~1.5h of stirring reaction；
(5) crosslinking agent, initiator B are dissolved in respectively and 20~30wt% cross-linking agent solutions, 20~30wt% is made into solvent
Initiator B solution, and be added in reactor R2, stir, treat that temperature is risen between 80~100 DEG C, 0.5~1h of insulation reaction；
(6) solvent in Distillation recovery step (5) gained product, product is dried, is crushed, and sieving obtains final product friendship
Connection starch.
Further, when preparing crosslinked starch, starch is selected from any one in cornstarch, tapioca or potato starch
The mixture of kind or two or more compositions；Organic phosphonate is selected from salicyl phosphonate, diethyl vinyl phosphonic hydrochlorate, burnt phosphorus
Described in one or more mixtures for constituting by a certain percentage in acid diester, organic phosphonate can be sodium salt or potassium
Salt；Organic solvent is methyl alcohol or alcohol that volumetric concentration is 80~90%；The pH of cushioning liquid is 7~9, prepares cushioning liquid
Buffer is sodium dihydrogen phosphate and the mixture or disodium-hydrogen of disodium-hydrogen and the mixture of citric acid or the group of the two
Close；Basifier is NaOH or potassium hydroxide or the mixture of the two；Crosslinking agent is selected from epoxychloropropane, POCl3, first
The mixture of any one or more composition in aldehyde；Initiator B be the mixture of ammonium persulfate and sodium sulfite, hydrogen peroxide and
The combination of any one or more in the mixture of the mixture, potassium peroxydisulfate and frerrous chloride of tartaric acid.
Herein, prepare and carry when cutting fluid loss additive, the weight fraction of other each raw materials refer to other each raw materials weight with
The ratio of crosslinked starch weight；When preparing crosslinked starch, the weight fraction of other each raw materials refer to other each raw materials weight with
The ratio of starch weight.
Raw material crosslinked starch of the invention can be that existing method is modified the crosslinked starch for obtaining.Under preferable case, this hair
Bright raw material crosslinked starch is prepared using the above method, and its preparation method is documented in the denomination of invention that the present invention is submitted on the same day simultaneously
For in the patent application of " drilling fluid crosslinked starch and preparation method thereof ".
Further, the biogum is selected from the mixed of any one or the two or more compositions in xanthans, guar gum, pectin
Compound；Natural fiber be flaxen fiber, cotton fiber, wood powder and shell in one or two.
Further, basifier is NaOH or potassium hydroxide or the mixture of the two.
Further, described comonomer is acrylamide, maleic anhydride, 2- acrylamide-2-methyl propane sulfonics
With one or two in acrylic acid.
Further, the initiator A be ammonium ceric nitrate, ammonium persulfate, potassium peroxydisulfate and sodium hydrogensulfite in one kind or
Two kinds.
The above-mentioned drilling fluid that the present invention is provided is comprised the following steps with putting forward the preparation method of cutting fluid loss additive：
(1) natural fiber and biogum are added in reactor R1 by proportioning；Basifier is dissolved in water, the alkali that will be made
The agent aqueous solution is added in reactor R1, is uniformly mixed；
(2) sodium chloroacetate is dissolved in water by proportioning, the sodium chloroacetate aqueous solution that will be made is added in reactor R1, is kept
Temperature between 50~80 DEG C, stirring reaction 30~50 minutes；
(3) epoxychloropropane is added in reactor R1 by proportioning, is maintained the temperature between 50~80 DEG C, stirring reaction
30~50 minutes；
(4) crosslinked starch is added in reactor R1 under agitation, continues to maintain the temperature between 50~80 DEG C,
It is uniformly mixed；
(5) initiator A is dissolved in water by proportioning, the initiator A aqueous solution that will be configured to is added in reactor R1, stirring
It is well mixed；
(6) comonomer is dissolved in water by proportioning, the comonomer aqueous solution that will be made is added in reactor R1, stirring
It is well mixed, obtain product by being reacted 20~40 minutes between maintaining the temperature at 50~80 DEG C.
Further, the concentration of the basifier aqueous solution is 30~40wt% in step (1)；Sodium chloroacetate is water-soluble in step (2)
The concentration of liquid is 30~40wt%；The concentration of the initiator A aqueous solution is 5~10wt% in step (5)；Copolymerization list in step (6)
The concentration of the body aqueous solution is 40~50wt%.
Further, the preparation method also includes, the product of step (6) is dried, is crushed, and obtains final product drilling fluid with carrying
Cut fluid loss additive finished product.Degree of grinding can be according to actual needs controlled, required finished particle degree is obtained.
The drilling fluid that the present invention is provided cuts fluid loss additive (this paper abbreviation VIF) with following outstanding feature and excellent with carrying
Point：
Firstth, combination property structural adjustment component --- crosslinked starch and modified natural fibers and life are contained in VIF products
The graft copolymer of thing glue, while its strand has very strong expansion service, can rapidly disperse after being stirred in water, stretch simultaneously
Form the space net structure with some strength, with certain plasticity, can science adjustment drilling fluid apparent viscosity and
The size of gel strength so that VIF while drilling fluid apparent viscosity is not greatly improved, can have plastic viscosity higher and
Yield value, so as to freely adjust ratio of dynamic shear force/yield value to plastic viscosity (YP/PV).
Second, the VIF products have outstanding filtrate loss controllability and Ti Qie effects in the water base slurry of saturated salt, show that it resists
Salt ability is strong.
3rd, the VIF product temperature resistance effects are good, its aging 16h at 160 DEG C in the saturated brine system, still with good
Good filtrate loss controllability and Ti Qie performances.
Specific embodiment
With reference to specific embodiment, the invention will be further described.
Embodiment 1
The embodiment is used to illustrate the preparation method of crosslinked starch in the present invention.
Cornstarch 100Kg, alcohol (85%v/v) 30Kg are added in reactor R2, by salicyl sodium phosphate 6Kg
It is dissolved in the 30wt% salicyl phosphonic acids sodium water solutions that water is made to be added in reactor R2,0.3Kg sodium dihydrogen phosphates is dissolved in
Obtained solution is mixed to get cushioning liquid (pH during obtained solution and 1.8Kg disodium-hydrogens are dissolved in 9Kg water in 1.5Kg water
It is 7-9), cushioning liquid is added in reactor R2, after stirring, it is rapidly heated, maintain the temperature at 50 DEG C or so reactions
30 minutes；The sodium hydrate aqueous solution of the 50wt% that NaOH 8Kg solution waters are made is slowly added into reactor R2, is protected
Temperature is held at 70 DEG C, after being sufficiently stirred for 20 minutes, 10Kg sodium chloroacetates is made the sodium chloroacetate aqueous solution of 30wt%, and add
To in reactor R2,70 DEG C or so of keeping temperature, fully reaction 60 minutes；0.07Kg epoxychloropropane is dissolved in alcohol (85%
V/v it is made 30wt% epoxychloropropane alcoholic solutions in), and adds reactor R2, is sufficiently stirred for, by 0.05Kg ammonium persulfates
The 30wt% ammonium persulfate aqueous solutions being made soluble in water and the 0.05Kg sodium sulfites 30wt% sulfurous acid being made soluble in water
Sodium water solution is quickly stirred in being added to reactor R2 simultaneously, 90 DEG C or so of keeping temperature, after reacting 40 minutes, by product
Recovery of alcohol distillation, then dried successively, crushed, crossing 60 mesh standard sieves, obtain crosslinked starch finished product.
Embodiment 2
The embodiment is used to illustrating the drilling fluid of present invention offer with putting forward the preparation method of cutting fluid loss additive.
Melon glue 10Kg, xanthans 8Kg and cotton fiber 10Kg are weighed respectively, are added in reactor R1；Weigh hydroxide
Sodium 3Kg is configured to the aqueous solution that mass fraction is 30% and is added in reactor R1, at the uniform velocity stirs 10 minutes；Weigh 2Kg chloroethenes
Sour sodium is configured to the aqueous solution that concentration is 40wt% and is added in reactor R1, at the uniform velocity stirs 35 minutes, 60 DEG C of left sides of keeping temperature
It is right；Weigh 1Kg epoxychloropropane to be added in reactor R1, at the uniform velocity stir, while maintaining the temperature at 60 DEG C or so, reaction time
It is 35 minutes；Weigh 100Kg crosslinked starch obtained in embodiment 1 to be slowly added under agitation in reactor R1, continue
Maintain the temperature between 60 DEG C, at the uniform velocity stir 20 minutes；Weigh 0.5Kg ammonium ceric nitrates and be configured to concentration for the 5wt% aqueous solution adds
Enter in reactor R1, quickly stir；It is the 40wt% aqueous solution to weigh 40Kg acrylamide monomers and be dissolved in water to be made concentration
It is added in reactor R1, quickly stirring, holding generates product after reacting 30 minutes.Product is dried successively, is crushed,
60 mesh standard sieves are crossed, finished product is obtained.
Embodiment 3
The embodiment is used to illustrating the drilling fluid of present invention offer with putting forward the preparation method of cutting fluid loss additive.
Melon glue 35Kg, flaxen fiber 25Kg and shell 10Kg are weighed respectively, is added in reactor R1, weigh potassium hydroxide
8Kg is configured to the aqueous solution that concentration is 40wt% and is added in reactor R1, at the uniform velocity stirs 15 minutes；Weigh 5Kg sodium chloroacetates
It is configured to the aqueous solution that concentration is 40wt% to be added in reactor R1, at the uniform velocity stirs 50 minutes, 80 DEG C or so of keeping temperature；Claim
Take 3Kg epoxychloropropane to be added in reactor R1, at the uniform velocity stir, while maintaining the temperature at 80 DEG C or so, the reaction time is 50
Minute.Weigh 100Kg crosslinked starch obtained in embodiment 1 to be slowly added under agitation in reactor R1, continue to keep
Temperature is at the uniform velocity stirred 30 minutes between 80 DEG C；Weigh 1.0Kg potassium peroxydisulfates and 1.0Kg sodium hydrogensulfites be configured to respectively it is dense
Spend for the 10wt% aqueous solution is added in reactor R1, quickly stir；Weigh 50Kg 2- acrylamide -2- methyl-prop sulphurs
Acid and 10Kg acrylamide monomers are dissolved in water and are made concentration for the 50wt% aqueous solution is added in reactor R1, quick 30 points of stirring
Clock, product is generated after keeping reaction 40 minutes.Product dried successively, is crushed, being crossed 60 mesh standard sieves, being obtained finished product.
Embodiment 4
The embodiment is used to illustrating the drilling fluid of present invention offer with putting forward the preparation method of cutting fluid loss additive.
Weigh xanthans 35Kg and wood powder 20Kg is added in reactor R1, weigh potassium hydroxide 4Kg and be configured to quality point
Number is added in reactor R1 for the aqueous solution of 35wt%, is at the uniform velocity stirred 15 minutes；Weigh 3Kg sodium chloroacetates and be configured to concentration and be
The aqueous solution of 40wt% is added in reactor R1, is at the uniform velocity stirred 40 minutes, 60 DEG C or so of keeping temperature；Weigh 1.5Kg epoxies
Chloropropane is added in reactor R1, is at the uniform velocity stirred, while maintaining the temperature at 60 DEG C or so, the reaction time is 40 minutes.Weigh
100Kg crosslinked starch is slowly added into reactor R1 under agitation obtained in embodiment 2, continues to maintain the temperature at 60 DEG C
Between, at the uniform velocity stir 20 minutes；Weigh 1.0Kg ammonium persulfates and 1.0Kg sodium hydrogensulfites are configured to concentration for 10wt% respectively
The aqueous solution is added in reactor R1, is quickly stirred；Weigh 50Kg maleic anhydride monomers and be dissolved in water and be made concentration and be
The 50wt% aqueous solution is added in reactor R1, is quickly stirred, and product is generated after keeping reaction 40 minutes.By product according to
It is secondary to be dried, crushed, crossing 60 mesh standard sieves, obtain finished product.
Embodiment 5
The embodiment is used to illustrating the drilling fluid of present invention offer with putting forward the preparation method of cutting fluid loss additive.
Pectin 8Kg, melon glue 2Kg and shell 10Kg are weighed respectively to be added in reactor R1, are weighed NaOH 2Kg and are matched somebody with somebody
It is made the aqueous solution that concentration is 40wt% to be added in reactor R1, at the uniform velocity stirs 10 minutes；1Kg sodium chloroacetates are weighed to be configured to
Concentration is added in reactor R1 for the aqueous solution of 30wt%, is at the uniform velocity stirred 30 minutes, 50 DEG C or so of keeping temperature；Weigh
0.5Kg epoxychloropropane is added in reactor R1, is at the uniform velocity stirred, while maintaining the temperature at 50 DEG C or so, the reaction time is 30
Minute.Weigh 100Kg crosslinked starch obtained in embodiment 2 to be slowly added under agitation in reactor R1, continue to keep
Temperature is at the uniform velocity stirred 10 minutes between 50 DEG C；Weigh 0.5Kg ammonium ceric nitrates and be configured to concentration for the 10wt% aqueous solution is added to
In reactor R1, quickly stir；Weigh 10Kg acrylic acid and 10Kg acrylamide monomers are dissolved in water and are made concentration and are respectively
The 50wt% aqueous solution is added in reactor R1, is quickly stirred, and product is generated after keeping reaction 20 minutes.By product according to
It is secondary to be dried, crushed, crossing 60 mesh standard sieves, obtain finished product.
Embodiment 6
The embodiment is used to illustrating the drilling fluid of present invention offer with putting forward the preparation method of cutting fluid loss additive.Raw material used
Crosslinked starch is commercially available crosslinked starch, and it is raw material that the commercially available crosslinked starch uses tapioca, and NaOH is catalyst, and three is inclined
Sodium phosphate is crosslinking agent, crosslinked action is carried out to starch and is obtained.
Melon glue 10Kg, xanthans 8Kg and shell 20Kg are weighed respectively, are added in reactor R1；Weigh NaOH
4Kg is configured to the aqueous solution that mass fraction is 30% and is added in reactor R1, at the uniform velocity stirs 10 minutes；Weigh 1.5Kg chloroethenes
Sour sodium is configured to the aqueous solution that concentration is 40wt% and is added in reactor R1, at the uniform velocity stirs 30 minutes, 60 DEG C of left sides of keeping temperature
It is right；Weigh 1Kg epoxychloropropane to be added in reactor R1, at the uniform velocity stir, while maintaining the temperature at 60 DEG C or so, reaction time
It is 30 minutes；Weigh commercially available crosslinked starch 100Kg to be slowly added into reactor R1, be slowly stirred, continue to maintain the temperature at 60
Between DEG C, at the uniform velocity stir 20 minutes；Weigh 0.5Kg potassium peroxydisulfates and 0.5Kg sodium hydrogensulfites are configured to concentration for 5wt% respectively
The aqueous solution is added in reactor R1, is quickly stirred；Weigh 40Kg2- acrylamide-2-methyl propane sulfonic monomers and be dissolved in water
Concentration is made for the 45wt% aqueous solution is added in reactor R1, is uniformly mixed, generated after keeping reaction 30 minutes and produced
Thing.Product dried successively, is crushed, being crossed 60 mesh standard sieves, being obtained finished product.
Below by taking embodiment 3 as an example, obtained carrying is cut the temperature resistance of fluid loss additive, salt resistance, carry cut, filtrate loss controllability enters
Row is evaluated.
1st, the performance evaluation in fresh water-based slurry
The configuration of fresh water-based slurry：Measure 350mL distilled water to be stirred in cup in height, add 1.0gNaHCO3, it is stirred to dissolve.Side
High-speed stirred (mixing speed 8000 turns/more than min, similarly hereinafter) side adds 35.0g drilling fluids to stir 20min with soil, height is evaluated, its
Between at least stop twice, to scrape adhesion soil on the wall.
Quantitatively weigh obtained the carrying of embodiment 3 and cut fluid loss additive product, added in Gao Ban into base slurry, height stirs 20min,
At least stop therebetween twice, to scrape adhesion sample on the wall.Maintenance (the standing at room temperature) 24h in sealing container
Afterwards, height stirs 5min, by GB/T 16783：Water-base drilling fluid On-Site Test Procedure, determines its apparent viscosity, yield value and leak-off
Amount, as a result such as table 1 below.
Table 1
2nd, the performance evaluation in 4% salt slurries
The preparation of 4% salt slurries：The salt solution of the proportions 4% of 40.0g sodium chloride is added by every liter of distilled water；Measure
350mL4% salt solution is stirred in cup in height, be subsequently adding 1.0g sodium acid carbonates stirring make its dissolve after, is added in Gao Jiao 35.0g brill
Well liquid is native with evaluating.High-speed stirred 20min, should at least be interrupted twice therebetween, and the clay stirred on wall of cup high is sticked to scrape.
Quantitatively weigh obtained the carrying of embodiment 3 and cut fluid loss additive product, added in Gao Jiao into base slurry, height stirs 20min,
At least stop therebetween twice, to scrape adhesion sample on the wall.After conserving 24h in sealing container, height stirs 5min, presses
GB/T 16783：Water-base drilling fluid On-Site Test Procedure, determines its apparent viscosity, yield value and filter loss, as a result such as table 2 below.
Table 2
3rd, can be evaluated in saturated salt water slurry neutrality
The preparation of saturated salt water slurry：According to the proportional arrangement saturated brine that 400g sodium chloride is added in every liter of distilled water；Amount
350mL saturated brines are taken to be stirred in cup in height, be subsequently adding 1.0g sodium acid carbonates stirring make its dissolve after, added in Gao Jiao
35.0g drilling fluids are native with evaluating.High-speed stirred 20min, should at least be interrupted twice therebetween, and high stirring on wall of cup is sticked to scrape
Clay.
Quantitatively weigh obtained the carrying of embodiment 3 and cut fluid loss additive product, added in Gao Jiao into base slurry, height stirs 20min,
At least stop therebetween twice, to scrape adhesion sample on the wall.After conserving 24h in sealing container, height stirs 5min, presses
GB/T 16783：Water-base drilling fluid On-Site Test Procedure, determines its apparent viscosity, yield value and filter loss, as a result such as table 3 below.
Table 3
4th, heat-resisting property evaluation
Fresh water-based slurry, 4% brine mud and the water base slurry of saturated salt are prepared respectively according to mode described in as above 1,2 and 3, by mud
Slurry is fitted into ageing can, and in room temperature is cooled to after aging 16h at 160 DEG C, height stirs 5min, by GB/T16783：Water-base drilling fluid shows
Field test program, determines its apparent viscosity, yield value and filter loss, as a result such as table 4 below.
Table 4
Embodiment 2-6 gained drilling fluids are shown in Table 5 with carrying the property indices of cutting fluid loss additive VIF.
Table 5
Above-described embodiment is for example, the present invention can also be with other ad hoc fashions or other to of the invention
Particular form is implemented, without departing from idea of the invention or substantive characteristics.Therefore, from the point of view of the implementation method of description is in terms of any
It is regarded as illustrative and non-limiting.The scope of the present invention should illustrate by appended claims, any and claim
Intention and the equivalent change of scope also should be within the scope of the present invention.
Claims (7)
1. drilling fluid cuts fluid loss additive with carrying, it is characterised in that existed with modified natural fiber and biogum by crosslinked starch
Graft copolymerization is carried out in the presence of initiator A with comonomer to be obtained, wherein, on the basis of crosslinked starch weight, other each originals
The weight fraction of material is,
Biogum 10~35%
Natural fiber 10~35%
Basifier 2~8%
Sodium chloroacetate 1~5%
Epoxychloropropane 0.5~3%
Comonomer 20~60%
Initiator A 0.5~2%；
Described crosslinked starch is prepared using following methods：
（1）Each raw material comprising starch is weighed, on the basis of raw starch weight, the weight fraction of other each raw materials is：
Organic phosphonate 5~10%
Organic solvent 30~40%
Sodium chloroacetate 5~15%
Initiator B 0.05~1%
Crosslinking agent 0.05~0.1%
Basifier 5~15%；
（2）Starch, organic solvent and cushioning liquid are added in reactor R2 by proportioning, while by the organic phosphine of the ratio
Hydrochlorate is made into the organic phospho acid saline solution of 25~30wt%, is also added in reactor R2, heats up and maintain the temperature at 40~60
Between DEG C, 0.5~1h of stirring reaction；
（3）The basifier of the ratio is dissolved in water, 45~50wt% basifier aqueous solution is made, and the basifier aqueous solution is added
Enter in reactor R2, maintain the temperature at 60~90 DEG C, stir 20~30 minutes；
（4）The sodium chloroacetate of the ratio is dissolved in water, 20~30wt% sodium chloroacetate aqueous solution is made, and by sodium chloroacetate water
Solution is added in reactor R2, is maintained the temperature between 60~90 DEG C, 1~1.5h of stirring reaction；
（5）Crosslinking agent, initiator B are dissolved in solvent respectively and are made into 20~30wt% cross-linking agent solutions, 20~30wt% initiator Bs
Solution, and be added in reactor R2, it is uniformly mixed, treat that temperature is risen between 80~100 DEG C, 0.5~1h of insulation reaction；
（6）Distillation recovery step（5）Solvent in gained product, product is dried, is crushed, and sieving obtains final product crosslinking and forms sediment
Powder,
Described comonomer is in acrylamide, maleic anhydride, 2- acrylamide-2-methyl propane sulfonics and acrylic acid
One or two,
Described initiator B is mixture, the mixture of hydrogen peroxide and tartaric acid, the persulfuric acid of ammonium persulfate and sodium sulfite
The combination of any one or more in the mixture of potassium and frerrous chloride.
2. drilling fluid according to claim 1 cuts fluid loss additive with carrying, it is characterised in that when preparing crosslinked starch, starch
Selected from any one in cornstarch, tapioca or potato starch or the mixture of two or more compositions；Organic phosphonate
Selected from one or two mixtures for constituting by a certain percentage in salicyl phosphonate, diethyl vinyl phosphonic hydrochlorate；Have
Machine solvent be methyl alcohol or volumetric concentration for 80 ~ 90% alcohol；The pH of cushioning liquid is 7~9, prepares the buffer of cushioning liquid
It is the mixture or combination of the mixture or disodium-hydrogen and citric acid of sodium dihydrogen phosphate and disodium-hydrogen；Alkalization
Agent is NaOH or potassium hydroxide or the mixture of the two；Crosslinking agent is selected from any in epoxychloropropane, POCl3, formaldehyde
One or more mixture of composition.
3. drilling fluid according to claim 1 and 2 cuts fluid loss additive with carrying, it is characterised in that the biogum is selected from Huang
The mixture of any one or two or more compositions in virgin rubber, guar gum, pectin；Natural fiber is flaxen fiber, cotton fiber, wood
One or two in powder and shell.
4. drilling fluid according to claim 1 cuts fluid loss additive with carrying, it is characterised in that the initiator A is cerous nitrate
One or two in ammonium, ammonium persulfate, potassium peroxydisulfate and sodium hydrogensulfite.
5. any described drilling fluids of claim 1-4 are with putting forward the preparation method of cutting fluid loss additive, it is characterised in that including following
Step：
（1）Natural fiber and biogum are added in reactor R1 by proportioning；Basifier is dissolved in water, the basifier that will be made
The aqueous solution is added in reactor R1, is uniformly mixed；
（2）Sodium chloroacetate is dissolved in water by proportioning, the sodium chloroacetate aqueous solution that will be made is added in reactor R1, keeping temperature
Between 50~80 DEG C, stirring reaction 30~50 minutes；
（3）Epoxychloropropane is added in reactor R1 by proportioning, is maintained the temperature between 50~80 DEG C, stirring reaction 30~
50 minutes；
（4）Crosslinked starch is added in reactor R1 under agitation, continues to maintain the temperature between 50~80 DEG C, stirred
It is well mixed；
（5）Initiator A is dissolved in water by proportioning, the initiator A aqueous solution that will be configured to is added in reactor R1, stirring mixing
Uniformly；
（6）Comonomer is dissolved in water by proportioning, the comonomer aqueous solution that will be made is added in reactor R1, stirring mixing
Uniformly, continue to maintain the temperature between 50~80 DEG C, reaction can obtain product in 20~40 minutes.
6. drilling fluid according to claim 5 is with putting forward the preparation method of cutting fluid loss additive, it is characterised in that step（1）In
The concentration of the basifier aqueous solution is 30~40wt%；Step（2）The concentration of the middle sodium chloroacetate aqueous solution is 30~40wt%；Step
（5）The concentration of the middle initiator A aqueous solution is 5~10 wt%；Step（6）The concentration of the middle comonomer aqueous solution is 40~50
wt%。
7. the drilling fluid according to claim 5 or 6 is with putting forward the preparation method of cutting fluid loss additive, it is characterised in that the system
Preparation Method also includes, by step（6）Product dried, crushed, obtain final product drilling fluid with carrying and cut fluid loss additive finished product.
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| CN105860943A (en) * | 2016-04-24 | 2016-08-17 | 辽宁石油化工大学 | Inhibited type starch filtrate reducer for drilling fluid and preparation method of inhibited type starch filtrate reducer |
| CN108059950B (en) * | 2018-01-24 | 2020-06-19 | 中国石油大学(华东) | Preparation method of temperature-resistant salt-resistant filtrate reducer for water-based drilling fluid |
| CN108728053B (en) * | 2018-08-02 | 2020-10-27 | 中国地质大学（北京） | Environment-friendly temperature-resistant salt-resistant plugging fluid loss additive for low-solid-phase brine drilling fluid and preparation method thereof |
| CN110041900B (en) * | 2019-04-19 | 2021-11-12 | 中国石油天然气集团有限公司 | Modified polysaccharide environment-friendly viscosity-increasing cutting agent and preparation method and application thereof |
| CN110669481B (en) * | 2019-10-22 | 2020-11-20 | 石家庄华莱鼎盛科技有限公司 | Salt-resistant filtrate reducer modified gum resin for drilling fluid |
| CN111690386A (en) * | 2020-08-07 | 2020-09-22 | 安徽陆海石油助剂科技有限公司 | Cutting agent for drilling fluid |
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