CN114854379B - Environment-friendly cementing type wall fixing agent for water-based drilling fluid and preparation method and application thereof - Google Patents

Environment-friendly cementing type wall fixing agent for water-based drilling fluid and preparation method and application thereof Download PDF

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CN114854379B
CN114854379B CN202210643574.5A CN202210643574A CN114854379B CN 114854379 B CN114854379 B CN 114854379B CN 202210643574 A CN202210643574 A CN 202210643574A CN 114854379 B CN114854379 B CN 114854379B
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fixing agent
polymer
drilling fluid
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CN114854379A (en
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刘敬平
张泰丰
孙金声
吕开河
孙元伟
金家锋
黎剑
史胜龙
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China University of Petroleum East China
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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
    • C09K8/14—Clay-containing compositions
    • C09K8/18—Clay-containing compositions characterised by the organic compounds
    • C09K8/22—Synthetic organic compounds
    • C09K8/24—Polymers
    • 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
    • C09K8/14—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
    • C09K8/206—Derivatives of other natural products, e.g. cellulose, starch, sugars
    • 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
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • 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
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • General Life Sciences & Earth Sciences (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention provides an environment-friendly cementing type wall fixing agent for water-based drilling fluid, and a preparation method and application thereof. The environment-friendly cementing type wall fixing agent consists of a polymer, tannic acid and water; the mass ratio of the polymer to the tannic acid is 1:0.2-0.4; the mass ratio of the total mass of the polymer and the tannic acid to the water is 1-4:100; the polymer is a terpolymer of allyl alcohol, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid. The invention also provides a preparation method of the wall fixing agent. The environment-friendly cemented wall fixing agent disclosed by the invention has the effects of cementing stratum cracks, improving rock strength, inhibiting shale hydration dispersion and reducing drilling fluid filtration loss; the wall fixing agent is environment-friendly, low in cost and capable of effectively stabilizing the shale well wall, and is used for the drilling fluid of the fractured shale stratum.

Description

Environment-friendly cementing type wall fixing agent for water-based drilling fluid and preparation method and application thereof
Technical Field
The invention relates to an environment-friendly cementing type wall fixing agent for water-based drilling fluid and a preparation method and application thereof, and belongs to the technical field of drilling.
Background
In the process of drilling, water-based drilling fluid easily enters into the deep part of the stratum along the hole seams, so that serious accidents such as well wall collapse, drill sticking and the like are caused, and great economic loss is caused. The prior art mainly comprises the steps of adding a plugging agent to plug the hole seams of the broken stratum: asphalt plugging agents are required to have softening points matched with the formation temperature and insufficient plugging strength; the plugging agents such as calcium carbonate and silicon dioxide have high plugging strength, but the shape and the size of the plugging agents are difficult to be matched with the hole and the seam of a stratum accurately, and the plugging agents cannot be plugged effectively; the polymer microsphere plugging agent can effectively match the shape and the size of the stratum hole seam, but the plugging strength is not high.
In recent years, chemical bond type wall fixing agents are becoming research hot spots for stabilizing the walls of fractured strata. For example: chinese patent document CN104177517a provides a biomimetic polymer for borehole wall stabilization, which contains carboxymethyl chitosan as a main chain and a group derived from dopamine grafted on the main chain. Chinese patent document CN 106634878A provides a drilling fluid additive composition, which contains a bionic wall-fixing agent, wherein the bionic wall-fixing agent is carboxymethyl chitosan grafted with a group derived from dopamine on the main chain. Chinese patent document CN109679598A discloses a strong wall collapse-preventing water-based drilling fluid, which comprises a chemical wall-fixing agent, wherein the chemical wall-fixing agent is a polymer with dopamine groups grafted on the main chain, and is prepared from branched polyethylenimine and catechol monomers. Chinese patent document CN108456286a discloses a plugging anti-collapse agent methacrylate copolymer for drilling fluid, which is prepared from the following components in parts by weight: 30-40 parts of methacrylate, 20-30 parts of acrylate, 20-30 parts of acrylic acid, 5-10 parts of dopamine hydrochloride, 5-10 parts of cosolvent and 1-5 parts of initiator. However, the above dopamine-containing wall-fixing agent has high cost and is difficult to apply in oilfield industrialization. Chinese patent document CN109423263a provides a wall fixing agent modified resin polymer for drilling fluid, the modified resin polymer is prepared from the following raw materials: the wall fixing agent can effectively cement the formation hole and seam, but has poor compatibility with drilling fluid and cannot be used in the drilling fluid.
Therefore, the low-cost environment-friendly wall fixing agent for the water-based drilling fluid, which is environment-friendly and low-cost, can effectively stabilize the shale well wall through chemical cementing, and has great theoretical and practical significance for keeping the stability of the broken stratum well wall.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an environment-friendly cementing type wall fixing agent for water-based drilling fluid, and a preparation method and application thereof. The wall fixing agent can realize the cementation of rock particles, strengthen the well wall and prevent the collapse of the well wall; meanwhile, water molecules can be prevented from invading the shale stratum through cracks, hydration expansion and dispersion of the shale are inhibited, and the effect of stabilizing the well wall is achieved.
The technical scheme of the invention is as follows:
an environment-friendly cemented wall fixing agent for water-based drilling fluid, which consists of a polymer, tannic acid and water; the mass ratio of the polymer to the tannic acid is 1:0.2-0.4; the mass ratio of the total mass of the polymer and the tannic acid to the water is 1-4:100; the polymer is a terpolymer of allyl alcohol, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid.
According to the invention, the polymer is preferably prepared according to the following method:
adding allyl alcohol into water, regulating the pH value of the system to 8-9, heating to the reaction temperature, adding acrylamide and 2-acrylamide-2-methylpropanesulfonic acid, introducing nitrogen to remove oxygen, and adding an initiator aqueous solution to initiate polymerization; after the reaction is finished, the obtained reaction liquid is dried and crushed to obtain the polymer.
Preferably, the mass ratio of the allyl alcohol to the water is 0.1-0.2:1.
Preferably, 10% by mass potassium hydroxide solution is used to adjust the pH of the system to 8-9.
Preferably, the reaction temperature is 50-60 ℃.
Preferably, the mass ratio of the acrylamide to the allyl alcohol is 0.25-1:1.
Preferably, the mass ratio of the 2-acrylamide-2-methylpropanesulfonic acid to the allyl alcohol is 0.25-1:1.
Preferably, the initiator is one or a combination of more than two of potassium persulfate, sodium bisulfite and azo diisobutyl amidine hydrochloride; the mass of the initiator is 0.1-1% of the total mass of the allyl alcohol, the acrylamide and the 2-acrylamide-2-methylpropanesulfonic acid; the mass fraction of the initiator aqueous solution is 0.5-1%.
Preferably, the polymerization reaction time is 3 to 5 hours.
Preferably, the drying is at 70-90 ℃ to constant weight.
According to the invention, the preparation method of the environment-friendly cementing type wall fixing agent for the water-based drilling fluid comprises the following steps:
and sequentially adding the polymer and the tannic acid into water, and uniformly stirring to obtain the environment-friendly cementing type wall fixing agent for the water-based drilling fluid.
According to the invention, the environment-friendly cementing type wall fixing agent for the water-based drilling fluid is applied to the water-based drilling fluid for the fractured formation, and particularly is applied to the water-based drilling fluid for the fractured shale formation.
The invention also provides a water-based drilling fluid for the fractured stratum, which comprises the following raw materials in parts by mass: 4 parts of bentonite, 0.2-0.6 part of polyamino alcohol AP-1 2 part, 0.25-1 part of carboxymethyl cellulose, 0.25-2 parts of sulfomethyl phenolic resin, 0.25-2 parts of environment-friendly cementing type wall fixing agent for the water-based drilling fluid, 0.25-2 parts of sulfonated asphalt, 0.25-2 parts of FCLS, 0.5-2 parts of polyalcohol and 400 parts of water.
The invention has the technical characteristics and beneficial effects that:
the environment-friendly cementing type wall fixing agent contains a terpolymer of allyl alcohol, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid, and the polymer prepared by the specific monomer can be adsorbed on shale through hydrogen bonds through groups such as amido, hydroxyl, sulfonic acid and the like on a long molecular chain; the tannic acid molecules in the wall fixing agent are provided with a large number of hydroxyl groups, and the tannic acid molecules tightly connect the polymer with the surface of shale through strong hydrogen bonds to play a role in cementing cracks. In the drilling process, the wall fixing agent can realize the cementation of rock particles, strengthen the well wall and prevent the collapse of the well wall. The cementing agent can also prevent water molecules from invading the shale stratum through cracks, inhibit hydration expansion and dispersion of the shale, and play a role in stabilizing the well wall. The wall fixing agent is environment-friendly, low in cost and capable of effectively stabilizing the shale well wall, and is used for the drilling fluid of the broken shale stratum.
Detailed Description
The present invention will be described in detail by way of examples, which are not intended to limit the scope of the invention. In the following preparation examples, examples and comparative examples, materials used are commercially available and methods used are conventional in the art unless otherwise specified.
The pharmaceutical group chemical agent of propenol is available from company limited.
Acrylamide was purchased from aledine.
Tannic acid, 2-acrylamido-2-methylpropanesulfonic acid, is supplied by saen chemical technology (Shanghai) limited.
The polyacrylamide potassium salt, the polyamine alcohol AP-1, the carboxymethyl cellulose, the sulfomethyl phenolic resin, the sulfonated asphalt, the FCLS and the polyalcohol are provided by the middle petroleum engineering institute of technology.
The polymers used in examples 1 to 5 and comparative examples 1 to 3 were prepared in the same manner as in preparation example 1.
Preparation example 1
The preparation method of the polymer comprises the following steps:
10g of allyl alcohol is added into a three-neck flask filled with 100g of deionized water, and 10 mass percent of potassium hydroxide solution is added to adjust the pH of the system to 8.5; then placing the three-neck flask in a water bath kettle, heating to 50 ℃, adding 5g of acrylamide and 5g of 2-acrylamide-2-methylpropanesulfonic acid, introducing nitrogen for 30min to remove oxygen, adding 10g of 0.8% potassium persulfate aqueous solution, and reacting for 4 hours at 50 ℃ to obtain a polymerization product solution; and (3) placing the polymerization product solution in a constant temperature drying oven at 80 ℃ for drying to constant weight, and crushing to obtain polymer powder.
Example 1
The preparation method of the environment-friendly cementing type wall fixing agent for the water-based drilling fluid comprises the following steps:
1g of polymer was added to a flask containing 100g of deionized water and stirred at a stirring rate of 60rpm to dissolve the polymer; weighing 0.2g of tannic acid, adding into the polymer solution, and fully stirring for 20min at a stirring speed of 60rpm to obtain a light yellow solution, namely the environment-friendly cementing type wall fixing agent A for water-based drilling fluid 1 。
Example 2
The preparation method of the environment-friendly cementing type wall fixing agent for the water-based drilling fluid comprises the following steps:
2g of polymer was added to a flask containing 100g of deionized water and stirred at a stirring rate of 60rpm to dissolve the polymer; weighing 0.4g of tannic acid, adding into the polymer solution, and fully stirring for 20min at a stirring speed of 60rpm to obtain a light yellow solution, namely the environment-friendly cementing type wall fixing agent A for water-based drilling fluid 2 。
Example 3
The preparation method of the environment-friendly cementing type wall fixing agent for the water-based drilling fluid comprises the following steps:
3g of polymer was added to a flask containing 100g of deionized water and stirred at a stirring rate of 60rpm to dissolve the polymer; weighing 0.6g of tannic acid, adding into the polymer solution, and fully stirring for 20min at a stirring speed of 60rpm to obtain a light yellow solution, namely the environment-friendly cementing type wall fixing agent A for water-based drilling fluid 3 。
Example 4
The preparation method of the environment-friendly cementing type wall fixing agent for the water-based drilling fluid comprises the following steps:
1g of polymer was added to a flask containing 100g of deionized water and stirred at a stirring rate of 60rpm to dissolve the polymer; weighing 0.3g of tannic acid, adding into the polymer solution, and fully stirring for 20min at a stirring speed of 60rpm to obtain a light yellow solution, namely the environment-friendly cementing type wall fixing agent A for water-based drilling fluid 4 。
Example 5
The preparation method of the environment-friendly cementing type wall fixing agent for the water-based drilling fluid comprises the following steps:
1g of polymer was added to a flask containing 100g of deionized water and stirred at a stirring rate of 60rpm to dissolve the polymer; weighing 0.4g of tannic acid, adding into the polymer solution, and fully stirring for 20min at a stirring speed of 60rpm to obtain a light yellow solution, namely the environment-friendly cementing type wall fixing agent A for water-based drilling fluid 5 。
Comparative example 1
The preparation method of the wall fixing agent for the water-based drilling fluid comprises the following steps:
2g of polymer was added to a charge of 100g of deionized waterIn a flask with water, stirring at 60rpm to dissolve the polymer, and obtaining polymer solution as the solid wall agent D for water-based drilling fluid 1 。
Tannic acid is not added in the comparative example, and only the terpolymer of allyl alcohol, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid is used as a wall fixing agent.
Comparative example 2
The preparation method of the environment-friendly cementing type wall fixing agent for the water-based drilling fluid comprises the following steps:
2g of polymer was added to a flask containing 100g of deionized water and stirred at a stirring rate of 60rpm to dissolve the polymer; weighing 0.2g of tannic acid, adding into the polymer solution, and fully stirring for 20min at a stirring speed of 60rpm to obtain a pale yellow solution, namely the environment-friendly cementing type wall fixing agent D for water-based drilling fluid 2 。
The ratio of polymer to tannic acid in this comparative example was too small.
Comparative example 3
The preparation method of the environment-friendly cementing type wall fixing agent for the water-based drilling fluid comprises the following steps:
2g of polymer was added to a flask containing 100g of deionized water and stirred at a stirring rate of 60rpm to dissolve the polymer; 1.0g of tannic acid is weighed and added into the polymer solution, and the mixture is fully stirred for 20min at the stirring speed of 60rpm to obtain a light yellow solution, namely the environment-friendly cementing type wall fixing agent D for the water-based drilling fluid 3 。
The ratio of polymer to tannic acid in this comparative example was too large.
Comparative example 4
The preparation method of the environment-friendly cementing type wall fixing agent for the water-based drilling fluid comprises the following steps:
(1) Preparation of the polymer:
100g of deionized water was taken, added with 10% by mass potassium hydroxide solution to adjust the pH to 8.5, and transferred to a three-necked flask. Placing the three-neck flask in a water bath kettle, heating to 50 ℃, adding 5g of acrylamide and 5g of 2-acrylamide-2-methylpropanesulfonic acid, introducing nitrogen for 30min to remove oxygen, adding 10g of 0.8% potassium persulfate aqueous solution, and reacting for 4h at 50 ℃ to obtain a polymerization product solution; and (3) placing the polymerization product solution in a constant temperature drying oven at 80 ℃ for drying to constant weight, and crushing to obtain polymer powder.
(2) Preparation of wall-fixing agent
Adding 2g of the polymer obtained in the step (1) into a flask containing 100g of deionized water, and stirring at a stirring rate of 60rpm to dissolve the polymer; weighing 0.4g of tannic acid, adding into the polymer solution, and fully stirring for 20min at a stirring speed of 60rpm to obtain a pale yellow solution, namely the environment-friendly cementing type wall fixing agent D for water-based drilling fluid 4 。
The polymer used in this comparative example was an acrylamide 2-acrylamide-2-methylpropanesulfonic acid copolymer.
Comparative example 5
The preparation method of the environment-friendly cementing type wall fixing agent for the water-based drilling fluid comprises the following steps:
(1) Preparation of the polymer:
10g of sodium styryl sulfonate is added into a three-neck flask filled with 100g of deionized water, and 10 mass percent of potassium hydroxide solution is added to adjust the pH of the system to 8.5; then placing the three-neck flask in a water bath kettle, heating to 50 ℃, adding 5g of acrylamide and 5g of 2-acrylamide-2-methylpropanesulfonic acid, introducing nitrogen for 30min to remove oxygen, adding 10g of 0.8% potassium persulfate aqueous solution, and reacting for 4 hours at 50 ℃ to obtain a polymerization product solution; and (3) placing the polymerization product solution in a constant temperature drying oven at 80 ℃ for drying to constant weight, and crushing to obtain polymer powder.
(2) Preparation of wall fixing agent:
adding 2g of the polymer obtained in the step (1) into a flask containing 100g of deionized water, and stirring at a stirring rate of 60rpm to dissolve the polymer; weighing 0.4g of tannic acid, adding into the polymer solution, and fully stirring for 20min at a stirring speed of 60rpm to obtain a pale yellow solution, namely the environment-friendly cementing type wall fixing agent D for water-based drilling fluid 5 。
Test example 1
Putting 30g of shale rock scraps of 10 meshes into a die pressing device (D=15 mm), adding 3mL of distilled water, and pressing for 5 minutes under the condition of 10MPa to obtain a rock core; the wall fixing agents prepared in the examples and the comparative examples are respectively prepared into aqueous solutions with the mass fraction of 0.5%; the cores were respectively placed in different wall fixing agent solutions for 24 hours, the integrity of the cores was observed, and the test results are shown in table 1.
Table 1 integrity of core after 24h immersion in different wall fixing agent solutions
Figure BDA0003691752180000061
Figure BDA0003691752180000071
As can be seen from the data in Table 1, the environment-friendly cementing type wall fixing agent provided by the invention can effectively cement shale particles, further effectively cement shale cracks and play a role in stabilizing the wall of a fractured stratum well. As is evident from the results of experiments in comparative examples 1 to 3, the lack of tannins in the wall-fixing agent or too low a mass ratio of polymer to tannins results in a deterioration of the wall-fixing effect. The reduction of the tannic acid content of the wall-fixing agent reduces the cementing strength of the wall-fixing agent, and thus the core immersed in the solution collapses. If the tannic acid content in the wall-fixing agent is too high, the tannic acid and the polymer are excessively cemented into solid precipitates, and the performance of the wall-fixing agent is also greatly reduced. The polymers used in the wall-fixing agent of comparative examples 4 to 5 did not contain propenol, and had poor adsorption performance with shale, and as a result, the obtained wall-fixing agent had poor performance.
Test example 2
The drilling fluid is prepared according to the following formula: 4 parts of bentonite, 4 parts of polyamino alcohol AP-1 6 parts of carboxymethyl cellulose, 1 part of sulfomethyl phenolic resin, 1 part of wall fixing agent, 1 part of sulfonated asphalt, 1 part of FCLS, 2 parts of polymeric alcohol and 400 parts of water; wherein the wall fixing agents are the wall fixing agents prepared in examples 1-3 and comparative examples 1-5 respectively, the drilling fluids obtained by adding the wall fixing agents in examples 1-3 are respectively denoted as F1, F2 and F3, and the drilling fluids obtained by adding the wall fixing agents in comparative examples 1-5 are respectively denoted as DF1, DF2, DF3, DF4 and DF5.
The following performance tests were carried out on the drilling fluids
(1) Rheological property test:
400mL of the drilling fluid prepared above was stirred at 3000rpm for 20min, and then apparent viscosity (AV, mPa.s), plastic viscosity (PV, mPa.s), dynamic shear force (YP, pa), static shear force for 10s and 10min, and medium pressure API water loss (FL, mL) of the drilling fluid were measured according to GB/T16783.1-2006, respectively, and the results are shown in Table 2.
Table 2 drilling fluid performance
Figure BDA0003691752180000072
Figure BDA0003691752180000081
As can be seen from the data in Table 2, the environment-friendly cementing type wall fixing agent can effectively reduce the water loss of the water-based drilling fluid, can effectively reduce the filtrate from entering the stratum in the drilling process, plays a role in stabilizing the wall of the fractured stratum, and can control the addition of the polymer and the tannic acid within the range of the invention as the addition of the polymer and the tannic acid in the wall fixing agent increases, the lower the medium-pressure API water loss of the drilling fluid is, but the influence of the continuous increase of the addition of the polymer and the tannic acid on the water loss of the drilling fluid is less. From the results of the experiments in comparative examples 1-3, it is known that too high or too low a mass ratio of polymer to tannic acid would result in a decrease in the filtration performance of the wall-fixing agent if the wall-fixing agent lacks tannic acid. From the results of the experiments in comparative examples 4 to 5, it is known that the filtration reducing performance of the wall fixing agent is also reduced if the allyl alcohol monomer is absent or the allyl alcohol is replaced by other monomers.
(2) Shale expansion rate test
The experimental method for testing the shale expansion rate comprises the following steps:
the measurement was performed using a linear expansion coefficient tester (CPZ-II, purchased from Qingdao Hentada electric equipments Co., ltd.).
Firstly, pulverizing shale into powder by using a pulverizer, and sieving the powder by using a 100-mesh sieve. Then the shale powder which is sieved by a 100-mesh sieve is placed in a mould, the shale powder is added to a constant pressure of 10MPa by a SYB-19 hydraulic manual pump, and the shale powder is taken out after waiting for 5 minutes to obtain shale sheets.
Shale tablets were loaded into a sample cell of a linear expansion device, and after soaking for 16 hours with water-based drilling fluids (formulated in drilling fluids as described in rheological property tests) and deionized water obtained by adding the wall-fixing agents prepared in examples 1-3 and comparative examples 1-5, respectively, the final expansion rates shown on the linear expansion device were read. And the experimental results are shown in Table 3 by comparing the polyacrylamide potassium salts.
Table 3 drilling fluid shale inhibition of hydration expansion performance
Figure BDA0003691752180000082
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Figure BDA0003691752180000091
Comparing the results of examples 1-3, comparative examples 1-5, polyacrylamide potassium salt and deionized water in Table 3, it is known that the water-based drilling fluid containing the environment-friendly cementing type wall fixing agent can remarkably reduce the expansion rate of shale, inhibit the hydration expansion of shale and enhance the stability of the well wall of a fractured stratum.
(3) Shale compressive strength test
Shale cores (25 cm. Times.30 cm) were respectively immersed in drilling fluids (prepared in the drilling fluids as described in rheological property tests) and deionized water obtained by adding the wall fixing agents prepared in examples 1 to 3 and comparative examples 1 to 5 and polyacrylamide potassium salt for 24 hours, and then the compressive strength was measured, and an original core was taken as a comparison. The results are shown in Table 4.
Table 4 shale compressive strength
Figure BDA0003691752180000092
Figure BDA0003691752180000101
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As can be seen from Table 4, the higher the compressive strength of the core as the addition of the wall-fixing agent increases, which indicates that the drilling fluid containing the environment-friendly cementing type wall-fixing agent can effectively consolidate shale core and improve the compressive strength of the shale core. In the drilling operation, the water-based drilling fluid can stabilize the wall of a fractured stratum, prevent the wall of the stratum from collapsing and reduce the occurrence of underground complex conditions.
From the data, the environment-friendly cementing type wall fixing agent can be used for cementing stratum cracks, improving rock strength, inhibiting shale hydration dispersion and reducing drilling fluid filtration loss; the wall-fixing agent is environment-friendly, has low cost, can effectively stabilize the shale well wall, and is used for the drilling fluid of the fractured shale stratum
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.

Claims (7)

1. The environment-friendly cementing type wall fixing agent for the water-based drilling fluid is characterized by comprising a polymer, tannic acid and water; the mass ratio of the polymer to the tannic acid is 1:0.2-0.4; the mass ratio of the total mass of the polymer and the tannic acid to the water is 1-4:100; the polymer is a terpolymer of allyl alcohol, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid;
the polymer is prepared by the following steps:
adding allyl alcohol into water, regulating the pH value of the system to 8-9, heating to the reaction temperature, adding acrylamide and 2-acrylamide-2-methylpropanesulfonic acid, introducing nitrogen to remove oxygen, and adding an initiator aqueous solution to initiate polymerization; after the reaction is finished, the obtained reaction liquid is dried and crushed to obtain a polymer; the mass ratio of the acrylamide to the allyl alcohol is 0.25-1:1; the mass ratio of the 2-acrylamide-2-methylpropanesulfonic acid to the allyl alcohol is 0.25-1:1.
2. The environmentally friendly cementing type wall stabilizer for water-based drilling fluid according to claim 1, wherein the mass ratio of the allyl alcohol to the water is 0.1-0.2:1.
3. The environment-friendly cementing type wall fixing agent for water-based drilling fluid according to claim 1, wherein the pH of the system is regulated to 8-9 by using 10% by mass of potassium hydroxide solution, and the reaction temperature is 50-60 ℃.
4. The environment-friendly cementing type wall fixing agent for water-based drilling fluid according to claim 1, wherein the initiator is one or a combination of more than two of potassium persulfate, sodium bisulphite and azo diisobutyl amidine hydrochloride; the mass of the initiator is 0.1-1% of the total mass of the allyl alcohol, the acrylamide and the 2-acrylamide-2-methylpropanesulfonic acid; the mass fraction of the initiator aqueous solution is 0.5-1%.
5. The environmentally friendly cementitious wall stabilizer for water-based drilling fluids according to claim 1, wherein the polymerization reaction time is 3 to 5 hours; the drying is to dry to constant weight at 70-90 ℃.
6. The method for preparing the environment-friendly cementing type wall fixing agent for the water-based drilling fluid according to any one of claims 1 to 5, which comprises the following steps:
and sequentially adding the polymer and the tannic acid into water, and uniformly stirring to obtain the environment-friendly cementing type wall fixing agent for the water-based drilling fluid.
7. Use of the environmentally friendly cementitious wall stabilizer for water-based drilling fluids of any one of claims 1 to 5 in water-based drilling fluids for fractured formations.
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