CN109666464B - Plugging polymer filtrate reducer for drilling fluid, preparation method of plugging polymer filtrate reducer and drilling fluid - Google Patents
Plugging polymer filtrate reducer for drilling fluid, preparation method of plugging polymer filtrate reducer and drilling fluid Download PDFInfo
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- 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 invention provides a preparation method of a plugging polymer filtrate reducer for drilling fluid, which comprises the following steps: mixing water, 2-acrylamide-2-methylpropanesulfonic acid, alkyl acrylamide, N-methylene bisacrylamide and an emulsifier to obtain a water phase; mixing white oil, divinylbenzene and an emulsifier to obtain an oil phase; adding the water phase into the oil phase for emulsification to obtain a mixture emulsion; reacting the mixture emulsion under the action of an initiator to obtain a reaction product; and mixing the reaction product with an emulsifier to obtain the plugging polymer fluid loss additive for the drilling fluid. The method provided by the invention prepares the plugging polymer fluid loss additive for the drilling fluid with an internal and external cross-linked structure, and solves the problem that the fluid loss of the high-temperature clay-free drilling fluid is difficult to control. The invention also provides a plugging polymer fluid loss additive for the drilling fluid and the drilling fluid.
Description
Technical Field
The invention relates to the technical field of oilfield chemical drilling fluid treatment agents, in particular to a plugging type polymer fluid loss additive for drilling fluid, a preparation method of the plugging type polymer fluid loss additive and the drilling fluid.
Background
With the development of petroleum exploration and development towards deep parts, deep wells and special process wells are more and more, and the clay-phase-free drilling fluid system is low in solid phase content of submicron particles due to the fact that the clay-phase-free drilling fluid system does not contain clay, and is beneficial to improving the mechanical drilling speed. Compared with the water-based bentonite drilling fluid, the clay-phase-free drilling fluid is not limited by clay, and has large space for improving the inhibitive performance of the drilling fluid; the obtained filter cake is degradable, easy to reversely discharge and low in damage to a reservoir; low solid content, good lubricity and low circulating pressure consumption; large solid phase capacity, strong anti-drill chip pollution capacity, easy control of rheological property under high density condition, and the like.
However, the clay-free phase drilling fluid does not contain sakaguchi soil, so that a compact filter cake cannot be formed, and the control of the filtration loss at high temperature is difficult, and especially the clay-free phase drilling fluid with the temperature resistance of 150 ℃ does not have a special filtration loss reducing treatment agent at present. At present, conventional fluid loss additives for drilling fluids mainly comprise carboxymethyl cellulose, humic acid and derivatives thereof, resin fluid loss additives, modified starch, acrylamide polymers and the like, and the fluid loss additives can effectively control the fluid loss under the action of clay and are difficult to play under the condition of no clay.
Disclosure of Invention
In view of the above, the present invention provides a plugging polymer fluid loss additive for a drilling fluid, a preparation method thereof, and a drilling fluid.
The invention provides a plugging polymer fluid loss additive for drilling fluid, which is prepared by inverse emulsion polymerization of materials comprising water, 2-acrylamide-2-methylpropanesulfonic acid, alkyl acrylamide, N-methylene bisacrylamide, divinylbenzene, white oil, an emulsifier and an initiator.
In the invention, the particle size of the plugging polymer fluid loss additive for the drilling fluid is preferably 0.5-5.0 μm, more preferably 1-4 μm, and most preferably 2-3 μm.
The preparation method of the plugging polymer fluid loss additive for the drilling fluid comprises the following steps:
(1) mixing water, 2-acrylamide-2-methylpropanesulfonic acid, alkyl acrylamide, N-methylene bisacrylamide and an emulsifier to obtain a water phase;
(2) mixing white oil, divinylbenzene and an emulsifier to obtain an oil phase;
(3) adding the water phase into the oil phase for emulsification to obtain a mixture emulsion;
(4) reacting the mixture emulsion under the action of an initiator to obtain a reaction product;
(5) and mixing the reaction product with an emulsifier to obtain the plugging polymer fluid loss additive for the drilling fluid.
In the invention, the mass ratio of the water, the 2-acrylamido-2-methylpropanesulfonic acid, the alkylacrylamide, the acrylamide, the N, N-methylenebisacrylamide and the emulsifier in the step (1) is preferably (58.2 to 88): (17-52): (3-10): (7-30): (0.2-1.4): (0.757 to 2.270), more preferably (65 to 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 alkylacrylamide in step (1) is preferably N, N-dimethylacrylamide, N-diethylacrylamide or tert-butylacrylamide.
In the invention, the pH value of the water phase in the step (1) is preferably 7.0-9, more preferably 7.5-8.5, and most preferably 8.
In the invention, the mass ratio of the white oil, the divinylbenzene and the emulsifier in the step (2) is preferably (58.2-88): (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, the emulsifier in step (2) is preferably span 80.
In the invention, the emulsification in the step (3) is preferably high-speed emulsification, and the emulsification speed is preferably 10000-20000 r/min; the emulsifying time is preferably 20-30 min, and more preferably 25 min.
In the invention, the reaction temperature in the step (4) is preferably 25-35 ℃, and more preferably 30 ℃; the reaction is preferably carried out under vacuum conditions; the reaction is preferably carried out under the condition of introducing nitrogen; the time for vacuumizing and introducing nitrogen is preferably 15-30 min, and more preferably 20-25 min; the reaction time is preferably 5-15 h, and more preferably 10 h.
In the present invention, the initiator in step (4) preferably includes sulfite, persulfate and azo initiators; the mass ratio of the sulfite initiator to the persulfate initiator to the 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 to 0.025), and most preferably (0.03 to 0.05): (0.03-0.05): 0.025.
in the present invention, the sulfite is preferably sodium bisulfite, sodium metabisulfite, sodium sulfite or sodium thiosulfate; the persulfate initiator is preferably ammonium persulfate or potassium persulfate; the azo initiator is preferably a water-soluble azo initiator, more preferably azobisisobutyline hydrochloride, azobisisobutylamidine hydrochloride, azobiscyanovaleric acid or azobisisopropylimidazoline.
In the present invention, the temperature of mixing in step (5) is preferably less than 35 ℃. In the present invention, the emulsifier in step (5) is preferably OP-15.
In the invention, the preparation method of the plugging polymer fluid loss additive for drilling fluid preferably comprises the following steps:
(A1) adding 58.2-88 parts by mass of water into a preparation tank, starting stirring, adding 17-52 parts by mass of 2-acrylamido-2-methylpropanesulfonic acid, 3-10 parts by mass of alkylacrylamide, 7-30 parts by mass of acrylamide, 0.2-1.4 parts by mass of N, N-methylenebisacrylamide and 0.757-2.270 parts by mass of Tween-80 emulsifier or OP-10, stirring until the mixture is completely dissolved, and then adjusting the pH of a mixed system to 7.0-9 to obtain a water phase;
(A2) adding 58.2-88 parts by mass of white oil, 0.2-1.4 parts by mass of divinylbenzene and 2.852-6.809 parts by mass of span 80 emulsifier into a reaction kettle, and stirring until the materials are completely dissolved to obtain an oil phase;
(A3) slowly adding the water phase obtained in the step (1) into the oil phase obtained in the step (2) under the stirring condition, fully stirring, and emulsifying at a high speed for 20-30 min to obtain a mixture emulsion;
(A4) putting the mixture emulsion obtained in the step (3) into a reaction kettle, starting a stirrer, heating to 25-35 ℃, vacuumizing, introducing nitrogen for 15-30 min, sequentially adding 0.01-0.07 part by mass of sulfite, 0.01-0.07 part by mass of persulfate initiator and 0.01-0.03 part by mass of water-soluble azo initiator, uniformly stirring, reducing the stirring speed, and reacting for 5-15 h to obtain a reaction product;
(A5) and (4) after the reaction in the step (4) is finished, reducing the temperature of the reaction system to below 35 ℃, adding 0.2-1.5 parts by mass of OP-15 into the reaction product, uniformly stirring, and discharging to obtain the plugging polymer fluid loss additive for the drilling fluid.
The invention provides a drilling fluid, which comprises the plugging type polymer fluid loss additive for the drilling fluid in the technical scheme or the plugging type polymer fluid loss additive for the drilling fluid prepared by the method in the technical scheme. The invention has no special limitation on other components in the drilling fluid, and the drilling fluid is preferably a clay-free phase drilling fluid. In the present invention, the drilling fluid preferably comprises:
water, a viscosity increasing and cutting agent, a plugging polymer fluid loss additive for drilling fluid, a polymer inhibitor, NaOH, KCl and barite.
The mass content of the viscosity-increasing cutting agent in the drilling fluid is preferably 1-2%, more preferably 1.2-1.8%, and most preferably 1.4-1.6%. The invention is not limited to the kind and source of the said viscosity-enhancing cutting agent, and the weak gel viscosity-enhancing cutting agent disclosed in the patent CN 104140791A is preferably used.
In the invention, the plugging polymer fluid loss additive for drilling fluid is the plugging polymer fluid loss additive for drilling fluid described in the above technical scheme or the plugging polymer fluid loss additive for drilling fluid prepared by the method described in the above technical scheme, and is not described herein again.
In the invention, the mass content of the plugging polymer fluid loss additive for the drilling fluid in the drilling fluid is preferably 0.5-1%, more preferably 0.6-0.9%, and most preferably 0.7-0.8%.
The mass content of the polymer inhibitor in the drilling fluid is preferably 0.3-0.5%, and more preferably 0.4%. The invention has no special limitation on the type and source of the polymer inhibitor, and the polymer inhibitor for the clay-free phase drilling fluid disclosed in the patent with the application number of 201310517150.5 is preferably adopted.
In the invention, the mass content of NaOH in the drilling fluid is preferably 0.2-0.5%, and more preferably 0.3-0.4%.
In the invention, the mass content of KCl in the drilling fluid is preferably 5-10%.
The amount of barite used in the present invention is not particularly limited, and those skilled in the art can adjust the amount of barite according to the density of the drilling fluid actually required.
The plugging polymer fluid loss additive for the drilling fluid with an internal and external cross-linked structure is prepared by the method provided by the invention, so that the structural strength of a cross-linked network is improved, the swelling time is delayed, the high-temperature and high-pressure fluid loss is reduced, the aim of physically reducing the fluid loss is fulfilled, and the problem that the fluid loss of the high-temperature clay-free drilling fluid is difficult to control is solved. In addition, the preparation method of the plugging polymer filtrate reducer for the drilling fluid provided by the invention is simple in process and simple in operation steps.
Compared with the prior art, the deformable temperature-resistant gel particle fluid loss agent with the particle size of 0.5-5.0 mu m and certain strength is prepared by the method, and the fluid loss agent is in an internal and external crosslinking mode, so that the structural strength of gel particles is improved, and the swelling time can be delayed. The raw materials adopted by the method provided by the invention are all industrial products, purification treatment is not needed before reaction, the polymerization is initiated by an initiator through vacuumizing, introducing nitrogen to remove oxygen, and the preparation process is simple. The plugging polymer fluid loss agent for the drilling fluid, which is prepared by the invention, has strong temperature resistance, can particularly resist the high temperature of more than 170 ℃, is suitable for a high-temperature drilling fluid system, particularly a clay-phase-free drilling fluid, and a cross-linked network of the plugging polymer fluid loss agent is gradually expanded, so that micro cracks can be plugged, pressure transmission is blocked, and the high-temperature and high-pressure fluid loss of the drilling fluid is reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other examples, which may be modified or appreciated by those of ordinary skill in the art based on the examples given herein, are intended to be within the scope of the present invention.
The starting materials used in the following examples of the present invention are all commercially available products.
Example 1
Adding 58.2Kg of water into a preparation tank, starting stirring, adding 17Kg of 2-acrylamide-2-methylpropanesulfonic acid, 10Kg of N, N-dimethylacrylamide, 7Kg of acrylamide, 0.2Kg of N, N-methylenebisacrylamide and 0.757Kg of Tween-80, stirring until the materials are completely dissolved, and then adjusting the pH value of a mixed system to 7.0-9 to obtain a water phase;
adding 88Kg of white oil, 1.4Kg of divinylbenzene and 6.809Kg of span 80 emulsifier into a reaction kettle, and stirring until the materials are completely dissolved to obtain an oil phase;
slowly adding the water phase into the oil phase under stirring, stirring for 30min, and emulsifying at high speed for 20min to obtain mixed emulsion;
putting the mixed emulsion into a reaction kettle, starting a stirrer, heating to 35 ℃, vacuumizing, introducing nitrogen for 15-30 min, sequentially adding 0.07Kg of sodium bisulfite, 0.07Kg of ammonium persulfate and 0.01Kg of azodiisobutylene hydrochloride, stirring for 10min, reducing the stirring speed, and reacting for 5h to obtain a reaction product;
and after the reaction is finished, reducing the temperature to 25 ℃, adding 0.2Kg of OP-15 into the reaction product, stirring for 30min, and discharging to obtain the plugging polymer fluid loss additive for the drilling fluid.
Example 2
Adding 88Kg of water into a preparation tank, starting stirring, adding 52Kg of 2-acrylamide-2-methylpropanesulfonic acid, 3Kg of N, N-diethylacrylamide, 30Kg of acrylamide, 1.4Kg of N, N-methylenebisacrylamide and 2.27Kg of emulsifier OP-10, stirring until the materials are completely dissolved, and then adjusting the pH value of a mixed system to 7.0-9 to obtain a water phase;
adding 58.2Kg of white oil, 0.2Kg of divinylbenzene and 2.852Kg of span 80 emulsifier into a reaction kettle, and stirring until the white oil, the divinylbenzene and the span 80 emulsifier are completely dissolved to obtain an oil phase;
slowly adding the water phase into the oil phase under stirring, stirring for 30min, and emulsifying at high speed for 20min to obtain mixture emulsion;
putting the mixture emulsion into a reaction kettle, starting a stirrer, heating to 25 ℃, vacuumizing, introducing nitrogen for 15-30 min, sequentially adding 0.01Kg of sodium metabisulfite, 0.01Kg of potassium persulfate and 0.02Kg of azodiisobutyl amidine hydrochloride, stirring for 10min, reducing the stirring speed, and reacting for 15h to obtain a reaction product;
and after the reaction is finished, reducing the temperature to 25 ℃, adding 1.5Kg of OP-15, stirring for 30min, and discharging to obtain the plugging polymer fluid loss additive for the drilling fluid.
Example 3
Adding 77Kg of water into a preparation tank, starting stirring, adding 39.62Kg of 2-acrylamide-2-methylpropanesulfonic acid, 5Kg of tert-butyl acrylamide, 15.38Kg of acrylamide, 0.6Kg of N, N-methylene bisacrylamide and 0.756Kg of Tween-80 emulsifier, stirring until the mixture is completely dissolved, and then adjusting the pH value of a mixed system to 7.0-9 to obtain a water phase;
adding 63.0Kg of white oil, 0.6Kg of divinylbenzene and 6.804Kg of span 80 emulsifier into a reaction kettle, and stirring until the white oil, the divinylbenzene and the span 80 emulsifier are completely dissolved to obtain an oil phase;
slowly adding the water phase into the oil phase under stirring, stirring for 30min, and emulsifying at high speed for 20min to obtain mixture emulsion;
putting the mixture emulsion into a reaction kettle, starting a stirrer, heating to 30 ℃, vacuumizing, introducing nitrogen for 15-30 min, sequentially adding 0.02Kg of sodium sulfite, 0.02Kg of ammonium persulfate and 0.03Kg of azodicyan valeric acid, stirring for 10min, reducing the stirring speed, and reacting for 15h to obtain a reaction product;
and after the reaction is finished, reducing the temperature to 30 ℃, adding 1.5Kg of OP-15, stirring for 30min, and discharging to obtain the plugging polymer fluid loss additive for the drilling fluid.
Example 4
Adding 79.75Kg of water into a preparation tank, starting stirring, adding 36.32Kg of 2-acrylamide-2-methylpropanesulfonic acid, 8.68Kg of N, N-dimethylacrylamide, 10Kg of acrylamide, 0.55Kg of N, N-methylene bisacrylamide and 0.78Kg of emulsifier OP-10, stirring until the materials are completely dissolved, and then adjusting the pH value of a mixed system to 7.0-9 to obtain a water phase;
adding 65.0Kg of white oil, 0.55Kg of divinylbenzene and 7.02Kg of span 80 emulsifier into a reaction kettle, and stirring until the materials are completely dissolved to obtain an oil phase;
slowly adding the water phase into the oil phase under stirring, stirring for 30min, and emulsifying at high speed for 20min to obtain mixture emulsion;
putting the mixture emulsion into a reaction kettle, starting a stirrer, heating to 30 ℃, vacuumizing, introducing nitrogen for 15-30 min, sequentially adding 0.03Kg of sodium bisulfite, 0.03Kg of ammonium persulfate and 0.02Kg of azodiisopropyl imidazoline, stirring for 10min, reducing the stirring speed, and reacting for 15h to obtain a reaction product;
and after the reaction is finished, reducing the temperature to 30 ℃, adding 1.5Kg of OP-15, stirring for 30min, and discharging to obtain the plugging polymer fluid loss additive for the drilling fluid.
Example 5
Adding 77Kg of water into a preparation tank, starting stirring, adding 39.62Kg of 2-acrylamide-2-methylpropanesulfonic acid, 5Kg of N, N-diethylacrylamide, 15.38Kg of acrylamide, 0.6Kg of N, N-methylenebisacrylamide and 1.64Kg of Tween-80 emulsifier, stirring until the mixture is completely dissolved, and then adjusting the pH value of a mixed system to 7.0-9 to obtain a water phase;
adding 63.0Kg of white oil, 0.6Kg of divinylbenzene and 6.552Kg of span 80 emulsifier into a reaction kettle, and stirring until the materials are completely dissolved to obtain an oil phase;
slowly adding the water phase into the oil phase under stirring, stirring for 30min, and emulsifying at high speed for 20min to obtain mixture emulsion;
putting the mixture emulsion into a reaction kettle, starting a stirrer, heating to 30 ℃, vacuumizing, introducing nitrogen for 15-30 min, sequentially adding 0.02Kg of sodium bisulfite, 0.02Kg of ammonium persulfate and 0.03Kg of azodiisobutylene hydrochloride, stirring for 10min, reducing the stirring speed, and reacting for 15h to obtain a reaction product;
and after the reaction is finished, reducing the temperature to 30 ℃, adding 1.52Kg of emulsifier OP-15, stirring for 30min, and discharging to obtain the plugging polymer fluid loss additive for the drilling fluid.
Example 6
The preparation method comprises the following steps of fully drying powder obtained by washing the plugging polymer fluid loss additive for drilling fluid prepared in the embodiments 1-5 with absolute ethyl alcohol, adhering the powder on conductive paper, spraying gold on the surface of the conductive paper, and observing the microscopic morphology of the plugging polymer fluid loss additive for drilling fluid under a scanning electron microscope SEM (scanning electron microscope), wherein the detection result shows that the plugging polymer fluid loss additive for drilling fluid prepared in the embodiments of the present invention is spherical, the particle size of the plugging polymer fluid loss additive for drilling fluid is 5 micrometers, the particle size of the plugging polymer fluid loss additive for drilling fluid is smaller than 0.5 micrometers, the specific result refers to Table 1, the Table 1 refers to the detection result of the particle size and the fluid loss performance of the plugging polymer fluid loss additive for drilling fluid prepared in the embodiments of the present invention, and the fluid loss performance refers to GB/T16783.1-2006 "part 1 of the field test of petroleum and natural gas industry drilling: the standard detection of water-based drilling fluid indicates that the drilling fluid comprises the following components:
water +1.5 wt% of an adhesion promoter +0.8 wt% of a plugging polymer fluid loss additive +0.4 wt% of a polymer inhibitor +0.3 wt% of NaOH +7 wt% of KCl + barite (the barite amount is determined by density).
The preparation method of the viscosity-increasing cutting agent comprises the following steps:
adding 117mL of water into a container, starting a stirrer, adding 42g of 2-acrylamide-2-methylpropanesulfonic acid, 38g of acrylamide, 20g of N, N-dimethylacrylamide, 0.1g of N, N-methylenebisacrylamide and 1.5g of Tween 80, stirring until the materials are dissolved, and controlling the pH value of the system to be 9.0 to obtain a required dispersed phase; adding 117mL of 5# white oil and 6.14g of span 80 into a container, and stirring until the mixture is dissolved to form a continuous phase; slowly adding the obtained dispersed phase into the continuous phase under stirring, and then fully stirring in an emulsifying kettle for 10min to obtain an inverse emulsion; and putting the obtained inverse emulsion into a reaction vessel provided with a stirrer, a liquid adding funnel, a nitrogen introducing pipe and a thermometer, introducing nitrogen for 30min, raising the temperature of a water bath to 50 ℃, slowly dropwise adding 0.1g of ammonium persulfate aqueous solution with the mass fraction of 10% and 0.1g of sodium bisulfite aqueous solution with the mass fraction of 10%, stirring for 20min, stopping stirring, continuously introducing nitrogen for 20min, standing, and reacting for 5h to obtain viscous milky white latex which is a weak gel viscosity-improving cutting agent.
The preparation method of the polymer inhibitor comprises the following steps:
adding 36g of acrylamide, 20g of N, N-dimethylacrylamide, 25g of N-vinyl-2-pyrrolidone and 19g of dimethyldiallylammonium chloride into 100g of water, fully dissolving, adjusting the pH value to 9, adding 0.2g of ammonium persulfate and 0.2g of sodium bisulfite respectively, reacting for 0.5-1 hour at 30 ℃ to obtain a gel polymer, shearing and granulating the product, drying and crushing at 60 ℃ to obtain the polymer inhibitor for the clay-free phase drilling fluid.
Table 1 particle size of plugging polymer fluid loss additive for drilling fluid prepared by the example of the present invention
And the result of the filtrate loss reduction performance detection
Refer to GB/T16783.1-2006 oil and gas industry drilling fluid field test part 1: according to the standard of water-based drilling fluid, the high-temperature stability (170 ℃, 7 wt% KCl) of the plugging polymer fluid loss additive for drilling fluid prepared in example 1 is detected according to the formula of the drilling fluid, the detection result is shown in table 2, and table 2 shows the high-temperature stability of the plugging polymer fluid loss additive for drilling fluid prepared in example 1 of the invention.
Table 2 high temperature plugging polymer fluid loss additive for drilling fluid prepared in example 1 of the present invention
Stability (170 ℃, 7 wt% KCl)
AV is apparent viscosity, PV is plastic viscosity, YP is dynamic shear force, YP/PV is dynamic-plastic ratio, Gel is initial/final shear force, Fl is API filtration loss, and HTHP at 150 ℃ is high-temperature high-pressure filtration loss.
The high-temperature stability of the plugging type polymer fluid loss additive for the drilling fluid prepared in the embodiments 2-5 of the invention is close to the performance of the plugging type polymer fluid loss additive for the drilling fluid prepared in the embodiment 1.
As can be seen from tables 1 and 2, the plugging polymer fluid loss additive for drilling fluid prepared by the invention has the particle size of 0.5-5.0 μm, the fluid loss after 150 ℃/16 aging is less than 5mL, the fluid loss at the high temperature and the high pressure of 170 ℃ is controlled within 15.0mL after continuous aging in clay-free phase drilling fluid for 72 hours, and the plugging polymer fluid loss additive has better plugging fluid loss reducing capability.
While only the preferred embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A preparation method of a plugging polymer fluid loss additive for drilling fluid comprises the following steps:
(1) mixing water, 2-acrylamide-2-methylpropanesulfonic acid, alkyl acrylamide, N-methylene bisacrylamide and an emulsifier to obtain a water phase;
(2) mixing white oil, divinylbenzene and an emulsifier to obtain an oil phase;
(3) adding the water phase into the oil phase for emulsification to obtain a mixture emulsion;
(4) reacting the mixture emulsion under the action of an initiator to obtain a reaction product;
(5) and mixing the reaction product with an emulsifier to obtain the plugging polymer fluid loss additive for the drilling fluid.
2. The method according to claim 1, wherein the alkyl acrylamide in the step (1) is N, N-dimethylacrylamide, N-diethylacrylamide or t-butylacrylamide.
3. The method according to claim 1, wherein the pH value of the aqueous phase in the step (1) is 7.0-9.
4. The method according to claim 1, wherein the emulsifying time in the step (3) is 20-30 min.
5. The method according to claim 1, wherein the temperature of the reaction in the step (4) is 25-35 ℃; the reaction time is 5-15 h.
6. The method of claim 1, wherein the initiator in step (4) comprises sulfite, persulfate, and azo initiators.
7. The method according to claim 6, wherein the mass ratio of the sulfite initiator to the persulfate initiator to the azo initiator is (0.01 to 0.07): (0.01-0.07): (0.01-0.03).
8. The method of claim 6, wherein the sulfite is sodium bisulfite, sodium metabisulfite, sodium sulfite, or sodium thiosulfate;
the persulfate initiator is ammonium persulfate or potassium persulfate;
the azo initiator is azobisisobutyline hydrochloride, azobisisobutylamidine hydrochloride, azobiscyanovaleric acid or azobisisopropylimidazoline.
9. The plugging polymer fluid loss additive for drilling fluid is characterized by being prepared by the preparation method of claim 1.
10. A drilling fluid, which comprises the plugging polymer fluid loss additive for the drilling fluid prepared by the method of any one of claims 1 to 8 or the plugging polymer fluid loss additive for the drilling fluid of claim 9.
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| CN111285964B (en) * | 2020-03-10 | 2022-09-02 | 长江大学 | Temperature-resistant and salt-resistant micro-crosslinked fluid loss additive for drilling fluid and preparation method thereof |
| CN113621107B (en) * | 2020-05-08 | 2023-05-02 | 中石化石油工程技术服务有限公司 | Reverse emulsion hyperbranched polymer filtrate reducer for drilling fluid and preparation method and application thereof |
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