CN115433311A - Working fluid for preventing drilling fluid from transmitting pressure to stratum pore and preparation method thereof - Google Patents
Working fluid for preventing drilling fluid from transmitting pressure to stratum pore and preparation method thereof Download PDFInfo
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- CN115433311A CN115433311A CN202211011938.4A CN202211011938A CN115433311A CN 115433311 A CN115433311 A CN 115433311A CN 202211011938 A CN202211011938 A CN 202211011938A CN 115433311 A CN115433311 A CN 115433311A
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- 239000012530 fluid Substances 0.000 title claims abstract description 85
- 238000005553 drilling Methods 0.000 title claims abstract description 54
- 239000011148 porous material Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000000178 monomer Substances 0.000 claims abstract description 197
- 239000003999 initiator Substances 0.000 claims abstract description 97
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 86
- UUORTJUPDJJXST-UHFFFAOYSA-N n-(2-hydroxyethyl)prop-2-enamide Chemical group OCCNC(=O)C=C UUORTJUPDJJXST-UHFFFAOYSA-N 0.000 claims abstract description 79
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 77
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 48
- 239000008367 deionised water Substances 0.000 claims abstract description 42
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 42
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 72
- 238000004132 cross linking Methods 0.000 claims description 62
- 239000012224 working solution Substances 0.000 claims description 43
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 39
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 36
- 230000005540 biological transmission Effects 0.000 claims description 33
- 238000006116 polymerization reaction Methods 0.000 claims description 32
- 239000003112 inhibitor Substances 0.000 claims description 29
- AZQWKYJCGOJGHM-UHFFFAOYSA-N 1,4-benzoquinone Chemical group O=C1C=CC(=O)C=C1 AZQWKYJCGOJGHM-UHFFFAOYSA-N 0.000 claims description 24
- 230000000903 blocking effect Effects 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 16
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 8
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 7
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 7
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 6
- 229910052726 zirconium Inorganic materials 0.000 claims description 6
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 2
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000005755 formation reaction Methods 0.000 description 43
- 238000000034 method Methods 0.000 description 42
- 230000004888 barrier function Effects 0.000 description 38
- 230000008569 process Effects 0.000 description 38
- 238000012546 transfer Methods 0.000 description 35
- 238000009833 condensation Methods 0.000 description 34
- 230000005494 condensation Effects 0.000 description 34
- 238000001704 evaporation Methods 0.000 description 34
- 230000008020 evaporation Effects 0.000 description 34
- 239000002904 solvent Substances 0.000 description 34
- 238000002156 mixing Methods 0.000 description 31
- 230000000694 effects Effects 0.000 description 20
- 230000007423 decrease Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 229920001187 thermosetting polymer Polymers 0.000 description 7
- 239000002243 precursor Substances 0.000 description 5
- 239000004971 Cross linker Substances 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229920002401 polyacrylamide Polymers 0.000 description 4
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- 239000004115 Sodium Silicate Substances 0.000 description 3
- 239000002981 blocking agent Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000012065 filter cake Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 3
- 229910052911 sodium silicate Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012754 barrier agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QNILTEGFHQSKFF-UHFFFAOYSA-N n-propan-2-ylprop-2-enamide Chemical compound CC(C)NC(=O)C=C QNILTEGFHQSKFF-UHFFFAOYSA-N 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000013191 viscoelastic testing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
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- 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
- C09K8/40—Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention relates to the technical field of petroleum drilling, in particular to a working fluid for preventing a drilling fluid from transmitting pressure to a formation pore and a preparation method thereof, wherein the working fluid comprises deionized water, a monomer, a cross-linking agent and an initiator; wherein the monomer is N- (2-hydroxyethyl) acrylamide and is used for dissolving in deionized water, and the concentration of the dissolved monomer is more than 15mg/mL; the mass ratio of the crosslinking agent to the monomer is 0.01wt% -0.5 wt%, and the mass ratio of the initiator to the monomer is 0.024wt% -10 wt%. By the working fluid and the preparation method thereof, rapid curing can be accurately carried out in a proper time, and the problem that the pressure of a drilling fluid column can not be effectively blocked from being transferred to a low-pore-pressure stratum can be effectively solved.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a working fluid for blocking pressure transmission from a drilling fluid to a stratum pore and a preparation method thereof.
Background
Along with the oil gas exploration drilling meeting stratum conditions are increasingly complex, due to the limitation of a well body structure, differential pressure drill sticking caused by balancing the liquid column pressure of abnormal high pressure of the stratum and the low pressure of the stratum in the same open hole section occurs sometimes, so that great loss is brought to drilling engineering, and even a well hole is scrapped. The external cause of differential pressure sticking is the existence of the pressure difference between the pore pressure of the stratum and the pressure of the liquid column of the drilling fluid, and the internal cause of the differential pressure sticking is the existence of the filter cake on the well wall. One of the reasons for the formation of the filter cake is the filtration loss of the drilling fluid, and generally, the greater the pressure difference in the same permeable formation, the greater the filtration loss of the drilling fluid, the more solid particles deposited on the surface of the permeable formation, the thicker the filter cake, and the greater the possibility of pressure difference sticking.
At present, in the field of oil drilling, besides reducing the bottom hole fluid column pressure, the common methods for preventing the pressure difference drill sticking include the following methods for preventing the transmission of the drilling fluid column pressure to the low pore pressure stratum.
First, the hole and seam of stratum are blocked after thermosetting resin or polyacrylamide is used for crosslinking and curing, and the pressure of drilling fluid column is prevented from being transmitted to stratum with low pore pressure. Thermosetting resin or polyacrylamide precursors used in the process need to be mixed on the surface, then pumped to a corresponding position in the well through a drill rod, and then cured after being pumped to the corresponding position. However, the existing thermosetting resin is high in curing speed, and the drill pipe needs to operate for a long time to pump the thermosetting resin precursor to the downhole response position, so that the thermosetting resin precursor does not reach the target position during the pumping process and starts to cure, and a downhole accident can be caused. In addition, the thermosetting resin or polyacrylamide precursor has high viscosity, is not easy to enter pores and seams of the stratum or has small entering amount, and cannot achieve the purpose of effective blocking.
Second, sodium silicate is currently the most commonly used inorganic gel for WGSO (chemical water/gas block agent) applications. It forms a sol or gel by reacting with various chemical agents to block the transfer of drilling fluid column pressure to low pore pressure formations. The specific operation is to slowly add 15% HCl to the sodium silicate solution and inject the liquid into the formation. After the sodium silicate liquid is injected into the formation, it may form a gel within hours under the influence of the formation temperature. Higher formation temperatures may cause rapid solidification. However, silicates can react with a variety of common ions, resulting in a decrease in their gel strength. In addition, the strength of the silicate gel is related to the gel time. The longer the gel time, the weaker the gel strength, and the shorter the gel time, the better the gel strength. This results in the need to shorten the gelling time of the silicate as much as possible in practical applications, which causes difficulties in on-site construction. Once the gel time is too long, the problems of poor pressure transmission blocking effect, poor gel stability and the like can be caused, and meanwhile, HCl has great influence on the performance of the drilling fluid.
Thirdly, the cloud point effect of the polymeric alcohol is fully utilized to be separated out under a certain temperature condition, the holes and the seams of the stratum are blocked, and the pressure of the drilling fluid column is prevented from being transferred to the stratum with low pore pressure. However, the particle size of the precipitate of the polymeric alcohol is small (generally in the nanometer or micron range), so that the precipitate of the polymeric alcohol is difficult to effectively block large holes and seams in the formation.
Fourthly, in the prior art, a chinese patent document with publication number CN105694828a and publication date 2016, 06 and 22 is proposed, and the technical scheme disclosed in the patent document is as follows: the blocking agent for the organic salt drilling fluid is a copolymer obtained by copolymerizing 10-25 parts by weight of N-isopropyl acrylamide, 9-17 parts by weight of acrylamide and 1-3 parts by weight of N, N-methylene bisacrylamide under the action of an initiator and then drying the copolymer. The plugging agent for the organic salt drilling fluid has good temperature and salt resistance, temperature sensitivity and small influence on viscosity-shear of the drilling fluid; can be deformed and has good plugging effect.
In the actual use process, the following problems can occur in the technical scheme: the method has the defects that the particle size of the plugging agent is difficult to match with holes and seams of the stratum, so that the plugging efficiency is not high, the pressure bearing capacity after plugging is not high, and the like.
The methods have respective defects, and the problems that the transmission of the pressure of the drilling fluid to the stratum with low pore pressure cannot be effectively blocked and the like are easily caused by the fact that the drilling fluid is stuck or the plugging capability is not strong.
Disclosure of Invention
In order to solve the technical problems, the invention provides the working fluid for blocking the pressure transmission from the drilling fluid to the formation pore and the preparation method thereof, the working fluid can be accurately and quickly cured in a proper time, and the problem that the pressure transmission from the drilling fluid column to the formation with low pore pressure can not be effectively blocked can be effectively solved.
The invention is realized by adopting the following technical scheme:
the working fluid for blocking the transmission of pressure from the drilling fluid to the formation pore gaps is characterized in that: comprises deionized water, a monomer, a cross-linking agent and an initiator; wherein the monomer is N- (2-hydroxyethyl) acrylamide and is used for dissolving in deionized water, and the concentration of the dissolved monomer is more than 15mg/mL; the mass ratio of the crosslinking agent to the monomer is 0.01wt% -0.5 wt%, and the mass ratio of the initiator to the monomer is 0.024wt% -10 wt%.
The polymerization inhibitor is p-benzoquinone, and the mass ratio of the polymerization inhibitor to the monomer is 0.001-0.044 wt%.
The cross-linking agent is N-N methylene bisacrylamide or organic zirconium.
The initiator is ammonium persulfate, potassium persulfate or sodium persulfate.
The cross-linking agent is methylene bisacrylamide, the initiator is ammonium persulfate, and the polymerization inhibitor is p-benzoquinone.
The concentration of the monomer is A-100 mg/mL, wherein A is more than 15mg/mL.
The preparation method of the working fluid for preventing the drilling fluid from transmitting pressure to the formation pore space is characterized by comprising the following steps of: putting a monomer N- (2-hydroxyethyl) acrylamide into a container, adding deionized water, and fully stirring for dissolving; after the monomers are completely dissolved, adding corresponding cross-linking agent, initiator and polymerization inhibitor to obtain the working solution.
The initiator is configured in situ.
The working solution is used for carrying out monomer crosslinking reaction at the temperature of 80-120 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. during drilling, the formation temperature increases with depth due to the friction between the drill bit and the formation, which can reach 120 degrees celsius at 2000 meters. The invention utilizes N- (2-hydroxyethyl) acrylamide as a monomer to form the working solution which has good fluidity, and solves the problems that the thermosetting resin or the polyacrylamide precursor has higher viscosity, is not easy to enter stratum holes, seams or less in entering amount, and can not achieve effective plugging. When the device is used, the fluidity of the working fluid is fully utilized to enable the working fluid to enter stratum pores, the in-situ crosslinking polymerization of the working fluid is triggered by the stratum temperature, and gel is formed at a leakage layer to realize the blocking of pressure transmission, so that the pressure difference formed by the pressure of a drilling fluid column and the pressure of the stratum pores is reduced or eliminated, the transmission of the pressure of the drilling fluid column to a stratum with low pore pressure is blocked or weakened, the filtration loss of the drilling fluid is reduced, the formation of weak and thick mud cakes on a well wall is reduced, the occurrence of complex accidents such as differential pressure sticking is prevented, and the like. The working fluid can be used independently in the drilling process, and can also be matched with other bridging materials for drilling and plugging operation.
2. The invention selects N- (2-ethoxyl) acrylamide as a monomer, and is more controllable in crosslinking time than acrylamide as a monomer. Furthermore, N-N methylene bisacrylamide is used as a cross-linking agent, so that the cross-linking time can be regulated and controlled, and the gel strength is enhanced. Ammonium persulfate is used as an initiator for initiating the polymerization reaction of the monomers, and the crosslinking time can be regulated and controlled.
3. The addition of the polymerization inhibitor can also prolong the time of crosslinking, so that the working solution can be prepared in advance without being prepared on site. Through the matching of the polymerization inhibitor and the rest proportion, the cross-linking polymerization reaction of the working fluid can be continuously adjusted within the time range of 1~3 hours or even longer, and the full cross-linking of the working fluid in the stratum pore gap can be realized, so that a better pressure transmission blocking effect is shown, and the pressure difference formed by the pressure of a drilling fluid column and the pore pressure of the stratum is reduced or eliminated. Solves the problem of complex underground construction caused by shortening the gelling time of the silicate gel for improving the strength.
4. The working solution can be fully filled in the formation pore gaps, and the defects that the blocking efficiency is low, the pressure bearing capacity after blocking is low and the like caused by the fact that the polyalcohol and the blocking agent are difficult to be effectively matched with the sizes of the formation pore gaps and the gaps are overcome.
5. Because the initiator is easy to hydrolyze, the problem can be well solved by using the initiator as it is.
6. The working solution is used for carrying out monomer crosslinking reaction at the temperature of 80-120 ℃, so that the working solution can be matched with the formation temperature, the reaction condition is mild, and the consumed energy is low.
Drawings
The invention will be described in further detail with reference to the following description taken in conjunction with the accompanying drawings and detailed description, in which:
FIG. 1 is a schematic diagram showing the effect of monomer concentration on gel formation time in the present invention;
FIG. 2 is a schematic representation of the effect of monomer concentration on monomer conversion efficiency in the present invention;
FIG. 3 is a schematic diagram showing the effect of the ammonium persulfate content as an initiator on the gel formation time in the present invention;
FIG. 4 is a schematic representation of the effect of initiator ammonium persulfate content on monomer conversion efficiency in accordance with the present invention;
FIG. 5 is a schematic diagram showing the effect of temperature on gelling time in the present invention;
FIG. 6 is a schematic representation of the effect of temperature on monomer conversion efficiency in the present invention;
FIG. 7 is a schematic diagram showing the effect of the content of N-N methylene bisacrylamide as a crosslinking agent on gel formation time in the present invention;
FIG. 8 is a schematic representation of the effect of the N-N methylene bisacrylamide content of the crosslinking agent of the present invention on the monomer conversion efficiency;
FIG. 9 is a schematic diagram showing the effect of polymerization inhibitor content on gel formation time in the present invention;
FIG. 10 is a graphical representation of the effect of organozirconium content of the crosslinker on gel formation time in accordance with the present invention;
FIG. 11 is a schematic diagram showing the effect of the sodium persulfate content as the initiator on gel formation time in the present invention;
FIG. 12 is a graphical representation of the effect of initiator potassium persulfate content on gel formation time in accordance with the present invention;
FIG. 13 is a first schematic diagram showing the results of a viscoelasticity test of the pressure transfer barrier agent of the present invention at various temperatures;
FIG. 14 is a second graph showing the results of the viscoelasticity test of the pressure transfer barrier according to the present invention at different temperatures;
FIG. 15 is a third graph showing the results of the viscoelastic test of the pressure transfer barrier of the present invention at different temperatures.
Detailed Description
Example 1
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 15mg/mL, taking a cross-linking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), and the mass ratio of the initiator to the monomer is 4167 (0.024%). The monomer N- (2-hydroxyethyl) acrylamide is not crosslinked and gel is not generated after the constant temperature treatment at 80 ℃. Condensation is added in order to prevent the whole process of water evaporation.
Example 2
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 20mg/mL, taking a cross-linking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), and the mass ratio of the initiator to the monomer is 4167 (0.024%). And (3) carrying out constant temperature treatment at 80 ℃ for 30min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 3
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 40mg/mL, taking a crosslinking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), and the mass ratio of the initiator to the monomer is 4167 (0.024%). And (3) carrying out constant temperature treatment at 80 ℃ for 15min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 4
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), and the mass ratio of the initiator to the monomer is 10. Processing at 80 deg.C for 10min to crosslink monomer N- (2-hydroxyethyl) acrylamide to form gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 5
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, and mixing cross-linking agent N-N methylene bisacrylamide and initiator ammonium persulfate according to a proportion at room temperature to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), and the mass ratio of the initiator to the monomer is 100. And (3) carrying out constant temperature treatment at 80 ℃ for 15min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 6
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), and the mass ratio of the initiator to the monomer is 10000 (0.1%). And (3) carrying out constant temperature treatment at 80 ℃ for 16min, and crosslinking monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 7
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, and mixing cross-linking agent N-N methylene bisacrylamide and initiator ammonium persulfate according to a proportion at room temperature to obtain the pressure transfer barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%). And (3) carrying out constant temperature treatment at 80 ℃ for 16min, and crosslinking monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 8
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), and the mass ratio of the initiator to the monomer is 3333. And (3) carrying out constant temperature treatment at 80 ℃ for 40min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 9
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), and the mass ratio of the initiator to the monomer is 3571 (0.028%). And (3) carrying out constant temperature treatment at 80 ℃ for 45min, and crosslinking monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 10
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), and the mass ratio of the initiator to the monomer is 4167 (0.024%). And (3) carrying out constant temperature treatment at 80 ℃ for 80min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 11
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide, an initiator ammonium persulfate and a polymerization inhibitor p-benzoquinone according to a proportion, and mixing at room temperature to obtain the pressure transfer barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%), and the mass ratio of the polymerization inhibitor to the monomer is 2300. And (3) carrying out constant temperature treatment at 80 ℃ for 48min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 12
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide, an initiator ammonium persulfate and a polymerization inhibitor p-benzoquinone according to a proportion, and mixing at room temperature to obtain the pressure transfer barrier working solution. Wherein, the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%), and the mass ratio of the polymerization inhibitor to the monomer is 2300. And (3) carrying out constant temperature treatment at 75 ℃ for 50min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 13
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of which the concentration is 100mg/mL, and mixing a cross-linking agent N-N methylene bisacrylamide, an initiator ammonium persulfate and a polymerization inhibitor p-benzoquinone according to a ratio at room temperature to obtain the pressure transmission barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%), and the mass ratio of the polymerization inhibitor to the monomer is 2300. And (3) carrying out constant temperature treatment at 70 ℃ for 200min, and crosslinking monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 14
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 333 (0.3%), the mass ratio of the initiator to the monomer is 4167 (0.024%). And (3) carrying out constant temperature treatment at 80 ℃ for 135min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 15
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 1000 (0.1%), and the mass ratio of the initiator to the monomer is 4167 (0.024%). And (3) carrying out constant temperature treatment at 80 ℃ for 110min, and crosslinking monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 16
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 10000 (0.01%), and the mass ratio of the initiator to the monomer is 4167 (0.024%). And (3) carrying out constant temperature treatment at 80 ℃ for 185min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 17
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%). And (3) carrying out constant temperature treatment at 80 ℃ for 48min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 18
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%). And (3) carrying out constant temperature treatment at 70 ℃ for 50min, and crosslinking monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 19
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide and an initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%). And (3) carrying out constant temperature treatment at 60 ℃ for 200min, and crosslinking monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 20
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of which the concentration is 100mg/mL, and mixing a cross-linking agent N-N methylene bisacrylamide, an initiator ammonium persulfate and a polymerization inhibitor p-benzoquinone according to a ratio at room temperature to obtain the pressure transmission barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%), and the mass ratio of the polymerization inhibitor to the monomer is 0.005%. And (3) carrying out constant temperature treatment at 80 ℃ for 30min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 21
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide, an initiator ammonium persulfate and a polymerization inhibitor p-benzoquinone according to a proportion, and mixing at room temperature to obtain the pressure transfer barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%), and the mass ratio of the polymerization inhibitor to the monomer is 0.001%. And (3) carrying out constant temperature treatment at 80 ℃ for 32min, and crosslinking monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 22
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide, an initiator ammonium persulfate and a polymerization inhibitor p-benzoquinone according to a proportion, and mixing at room temperature to obtain the pressure transfer barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%), and the mass ratio of the polymerization inhibitor to the monomer is 0.004%. And (3) carrying out constant temperature treatment at 80 ℃ for 40min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 23
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a cross-linking agent N-N methylene bisacrylamide, an initiator ammonium persulfate and a polymerization inhibitor p-benzoquinone according to a proportion, and mixing at room temperature to obtain the pressure transfer barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%), and the mass ratio of the polymerization inhibitor to the monomer is 0.0044%. And (3) carrying out constant temperature treatment at 80 ℃ for 48min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 24
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of which the concentration is 100mg/mL, and mixing a cross-linking agent N-N methylene bisacrylamide, an initiator ammonium persulfate and a polymerization inhibitor p-benzoquinone according to a ratio at room temperature to obtain the pressure transmission barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%), and the mass ratio of the polymerization inhibitor to the monomer is 0.0054%. And (3) carrying out constant temperature treatment at 80 ℃ for 50min, and crosslinking monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 25
Taking deionized water as a solvent, taking 10mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking the cross-linking agent organic zirconium and the initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 333 (0.3%), and the mass ratio of the initiator to the monomer is 5000. Processing at 120 deg.C for 4min to crosslink monomer N- (2-hydroxyethyl) acrylamide to form gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 26
Taking deionized water as a solvent, taking 10mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking the cross-linking agent organic zirconium and the initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 1000 (0.1%), and the mass ratio of the initiator to the monomer is 5000. And (3) carrying out constant temperature treatment at 120 ℃ for 7min, and crosslinking monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 27
Taking deionized water as a solvent, taking 10mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking the cross-linking agent organic zirconium and the initiator ammonium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 10000 (0.01%), and the mass ratio of the initiator to the monomer is 5000. And (3) carrying out constant temperature treatment at 120 ℃ for 30min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 28
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of which the concentration is 100mg/mL, and taking the crosslinking agent N-N methylene bisacrylamide and the initiator sodium persulfate according to a proportion to mix at room temperature to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), and the mass ratio of the initiator to the monomer is 833 (0.12%). The gel is generated by crosslinking monomer N- (2-hydroxyethyl) acrylamide after the constant temperature treatment for 60min at 90 ℃. Condensation is added in order to prevent the whole process of water evaporation.
Example 29
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a crosslinking agent N-N methylene bisacrylamide and an initiator sodium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1250. And (3) carrying out constant temperature treatment at 90 ℃ for 90min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 30
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a crosslinking agent N-N methylene bisacrylamide and an initiator sodium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%). And (3) carrying out constant temperature treatment at 90 ℃ for 180min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 31
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of which the concentration is 100mg/mL, and taking the crosslinking agent N-N methylene bisacrylamide and the initiator potassium persulfate according to a proportion to mix at room temperature to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 500. Constant temperature treatment is carried out for 22min at the temperature of 80 ℃, and the monomer N- (2-hydroxyethyl) acrylamide is crosslinked to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 32
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a crosslinking agent N-N methylene bisacrylamide and an initiator potassium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), and the mass ratio of the initiator to the monomer is 625. Constant temperature treatment at 80 deg.C for 23min to crosslink monomer N- (2-hydroxyethyl) acrylamide to form gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 33
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of 100mg/mL, taking a crosslinking agent N-N methylene bisacrylamide and an initiator potassium persulfate according to a proportion, and mixing to obtain the pressure transfer barrier working solution. Wherein the mass ratio of the crosslinking agent to the monomer is 200 (0.5%), and the mass ratio of the initiator to the monomer is 1000. And (3) carrying out constant temperature treatment at 80 ℃ for 30min, and crosslinking the monomer N- (2-hydroxyethyl) acrylamide to generate gel. Condensation is added in order to prevent the whole process of water evaporation.
Example 34
Taking deionized water as a solvent, taking 50mL of monomer N- (2-hydroxyethyl) acrylamide of which the concentration is 100mg/mL, and taking the crosslinking agent N-N methylene bisacrylamide and the initiator potassium persulfate according to a proportion to mix at room temperature to obtain the pressure transfer barrier working solution. Wherein, the mass ratio of the cross-linking agent to the monomer is 200 (0.5%), the mass ratio of the initiator to the monomer is 1667 (0.06%). Constant temperature treatment at 80 deg.C for 33min to crosslink monomer N- (2-hydroxyethyl) acrylamide to form gel. Condensation is added in order to prevent the whole process of water evaporation.
Working fluids prepared according to examples 1, 2, 3, and 10 to block the pressure transmission of drilling fluids to formation fractures were tested for the effect of monomer concentration on gel formation time under otherwise unchanged conditions. Referring to the figure 1 of the specification, when the monomer N- (2-hydroxyethyl) acrylamide concentration is increased and the monomer crosslinking efficiency is more than 90%, the crosslinking time is gradually shortened from 30min to 10min, and when the monomer concentration is lower than 15mg/mL, the monomer cannot be crosslinked.
Working fluids prepared according to examples 1, 2, 3 and 10 for blocking pressure transmission to formation cracks were tested for the effect of monomer concentration on monomer conversion efficiency under otherwise unchanged conditions. Referring to FIG. 2 of the specification, the conversion efficiency as a function of the crosslinking time increases with increasing concentration of the monomer N- (2-hydroxyethyl) acrylamide; the results show that the monomer N- (2-hydroxyethyl) acrylamide crosslinks rapidly and that the crosslinking time decreases gradually as the monomer N- (2-hydroxyethyl) acrylamide concentration increases from 15mg/mL to 100 mg/mL.
Working fluid for blocking pressure transmission to a formation pore gap by the drilling fluid prepared according to the examples 4 to 10 is tested under the condition that other conditions are unchanged, and the influence of the content of the initiator on the gelling time is tested. Referring to the description figure 3, when the monomer crosslinking efficiency reaches over 90 percent along with the reduction of the initiator ammonium persulfate, the crosslinking time is gradually prolonged from 10min to 80min.
The working fluid for blocking the pressure transmission of the drilling fluid to the formation pore gaps prepared according to the examples 4 to 10 is tested for the influence of the content of the initiator on the monomer conversion efficiency under the condition that other conditions are unchanged. Referring to figure 4 of the specification, as initiator ammonium persulfate was reduced from 10% to 0.024%, conversion efficiency as a function of crosslinking time; the results show that the monomer N- (2-hydroxyethyl) acrylamide crosslinks rapidly and that the crosslinking time increases gradually with decreasing initiator.
The working fluid for transmitting pressure to the formation cracks through the barrier drilling fluid prepared according to the embodiments 11 to 13 is not changed under other conditions, and the influence of the temperature on the gelling time is tested. Referring to the description of FIG. 5, as the crosslinking temperature decreases, the crosslinking time gradually increases from 48min to 100min when the monomer crosslinking efficiency reaches 90% or more.
Working fluid for transmitting pressure to formation cracks by using the barrier drilling fluid prepared according to the embodiments 11 to 13 is tested for the conversion efficiency of temperature to monomers without changing other conditions. Referring to FIG. 6 of the specification, as the crosslinking temperature is decreased from 80 ℃ to 70 ℃, the conversion efficiency changes with the crosslinking time; the results show that the crosslinking time is gradually increased with decreasing crosslinking temperature.
Working fluids prepared according to examples 10, 14, 15 and 16 for blocking pressure transmission of drilling fluids to formation cracks were tested under otherwise unchanged conditions for the effect of crosslinker content on gel formation time. Referring to the description of FIG. 7, as the content of the crosslinking agent decreases, the crosslinking time gradually increases from 80min to 185min when the monomer crosslinking efficiency reaches 90% or more.
Working fluids prepared according to examples 10, 14, 15 and 16 for blocking pressure transmission of drilling fluids to formation cracks were tested under otherwise unchanged conditions for the effect of the crosslinker content on the monomer conversion efficiency. Referring to FIG. 8 of the specification, as the content of the crosslinking agent is reduced from 0.5% to 0.01%, the conversion efficiency varies with the crosslinking time; the results show that the crosslinking time is gradually increased with decreasing crosslinker content.
Working fluids prepared according to examples 20, 21, 22, 23 and 24 and used for blocking pressure transmission of drilling fluid to formation cracks are tested under the condition that other conditions are unchanged, and the influence of the content of the polymerization inhibitor on the gelling time is tested. Referring to FIG. 9 of the specification, the crosslinking time was gradually increased from 30min to 50min as the content of the polymerization inhibitor was increased.
Working fluids prepared according to examples 25, 26 and 27 and used for blocking pressure transmission of drilling fluids to formation cracks, and the influence of the content of organic zirconium in a cross-linking agent on gelling time was tested under the same conditions. Referring to FIG. 10 of the specification, as the content of organozirconium decreases, the crosslinking time gradually increases from 4min to 30min.
Working fluids prepared according to examples 28, 29 and 30 for blocking pressure transmission of drilling fluids to formation cracks were tested for the effect of the initiator sodium persulfate content on gel formation time without changing other conditions. Referring to FIG. 11 of the specification, as the content of organozirconium decreases, the crosslinking time gradually increases from 60min to 180min.
Working fluids for blocking pressure transmission to formation pores were prepared according to examples 31, 32, 33, and 34, and the effect of the initiator potassium persulfate content on gel formation time was tested without changing other conditions. Referring to FIG. 12 of the specification, as the content of organozirconium decreases, the crosslinking time gradually increases from 22min to 33min.
Working fluids prepared according to examples 17, 18 and 19 for blocking pressure transmission of drilling fluids to formation cracks were tested for viscoelastic properties of the pressure transmission blocking agents at different temperatures. Referring to fig. 13-15 in the specification, it can be seen from the comparison of the loss modulus of the storage modulus, that the storage modulus is greater than the loss modulus, which indicates that the gel is mainly elastically deformed, and that the gel is nearly solid and has good elasticity.
In summary, after reading the present disclosure, those skilled in the art should make various other modifications without creative efforts according to the technical solutions and concepts of the present disclosure, which are within the protection scope of the present disclosure.
Claims (9)
1. The working fluid for blocking the pressure transmission from the drilling fluid to the formation pore gaps is characterized in that: comprises deionized water, a monomer, a cross-linking agent and an initiator; the monomer is N- (2-hydroxyethyl) acrylamide and is used for dissolving in deionized water, and the concentration of the dissolved monomer is more than 15mg/mL; the mass ratio of the crosslinking agent to the monomer is 0.01wt% to 0.5wt%, and the mass ratio of the initiator to the monomer is 0.024wt% to 10wt%.
2. The working fluid for obstructing the transmission of the pressure of the drilling fluid to the pore space of the stratum according to the claim 1, which is characterized in that: the polymerization inhibitor is p-benzoquinone, and the mass ratio of the polymerization inhibitor to the monomer is 0.001-0.044 wt%.
3. The working fluid for blocking the transmission of pressure from a drilling fluid to the pores of the stratum according to claim 2, wherein: the cross-linking agent is N-N methylene bisacrylamide or organic zirconium.
4. The working fluid for obstructing the transmission of the pressure of the drilling fluid to the pore space of the stratum according to the claim 3, which is characterized in that: the initiator is ammonium persulfate, potassium persulfate or sodium persulfate.
5. The working fluid for obstructing the transmission of the pressure of the drilling fluid to the pore space of the stratum according to claim 4, which is characterized in that: the cross-linking agent is methylene bisacrylamide, the initiator is ammonium persulfate, and the polymerization inhibitor is p-benzoquinone.
6. The working fluid for obstructing the transmission of pressure of the drilling fluid to the pore spaces of the stratum according to the claim 1 or 5, which is characterized in that: the concentration of the monomer is A-100 mg/mL, wherein A is more than 15mg/mL.
7. The preparation method of the working fluid for preventing the drilling fluid from transmitting pressure to the formation pore space is characterized by comprising the following steps of: putting a monomer N- (2-hydroxyethyl) acrylamide into a container, adding deionized water, and fully stirring for dissolving; after the monomers are completely dissolved, adding corresponding cross-linking agent, initiator and polymerization inhibitor to obtain the working solution.
8. The preparation method of the working fluid for obstructing the pressure transmission of the drilling fluid to the formation pore space according to claim 7, which is characterized by comprising the following steps: the initiator is configured in situ.
9. The preparation method of the working fluid for obstructing the pressure transmission of the drilling fluid to the formation pore space according to claim 7, which is characterized by comprising the following steps: the working solution is used for carrying out monomer crosslinking reaction at the temperature of 80-120 ℃.
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