CN114854379A - 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 PDFInfo
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- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
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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 solidifying agent. The environment-friendly cementing type wall-fixing agent can cement the formation cracks, improve the rock strength, inhibit the hydration and dispersion of shale and reduce the filtration loss of drilling fluid; the wall-fixing agent is environment-friendly, has low cost, can effectively stabilize the shale well wall, and is used for the fractured shale formation drilling fluid.
Description
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
The water-based drilling fluid is easy to enter the deep part of the stratum along the cracks in the drilling process, so that serious accidents such as well wall collapse, drill sticking and the like are caused, and the great economic loss is caused. The existing treatment technology mainly comprises the following steps of adding a plugging agent to plug up fractured formation pores: the asphalt plugging agent requires that the softening point of the asphalt plugging agent is matched with the temperature of the stratum, and the plugging strength is insufficient; the plugging agent such as calcium carbonate, silicon dioxide and the like has high plugging strength, but the shape and the size of the plugging agent are difficult to be accurately matched with the formation pore and can not be plugged effectively; the polymer microsphere plugging agent can effectively match the shape and the size of the formation pore, but the plugging strength is not high.
In recent years, chemical cementing wall-fixing agents have become a research hotspot for stabilizing the wall of a fractured formation well. 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 biomimetic wall-fixing agent, wherein the biomimetic wall-fixing agent is carboxymethyl chitosan with a main chain grafted with a group derived from dopamine. Chinese patent document CN109679598A discloses a strong wall collapse prevention 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 polyethyleneimine 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 dopamine-containing wall firming agent has high cost and is difficult to be industrially applied in oil fields. Chinese patent document CN109423263A provides a wall-fixing agent modified resin polymer for drilling fluid, which is prepared from the following raw materials: the wall-fixing agent can effectively cement stratum pores, but has poor compatibility with the drilling fluid, and cannot be used in the drilling fluid.
Therefore, the low-cost environment-friendly wall solidifying agent for the water-based drilling fluid, which is environment-friendly, low in cost and capable of effectively stabilizing the shale well wall through chemical cementation, is developed, and has great theoretical and practical significance for maintaining the stability of the fractured formation 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 consolidating agent can consolidate rock particles, enhance the strength of a well wall and prevent the well wall from collapsing; 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 cementing type 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 a preferred embodiment of the invention, the polymer is prepared according to the following method:
adding allyl alcohol into water, adjusting the pH value of a system to 8-9, heating to a reaction temperature, adding acrylamide and 2-acrylamide-2-methylpropanesulfonic acid, introducing nitrogen to remove oxygen, and adding an initiator aqueous solution to initiate polymerization; and after the reaction is finished, drying and crushing the obtained reaction liquid to obtain the polymer.
Preferably, the mass ratio of the allyl alcohol to the water is 0.1-0.2: 1.
Preferably, the pH of the system is adjusted to 8-9 by using 10 mass percent of potassium hydroxide solution.
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 azodiisobutyl 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 methyl propanesulfonic acid; the mass fraction of the initiator aqueous solution is 0.5-1%.
Preferably, the time of the polymerization reaction is 3 to 5 hours.
Preferably, the drying is drying 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 preferably 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 stratum, in particular to the water-based drilling fluid for the fractured shale stratum.
The invention also provides a water-based drilling fluid for a fractured stratum, which is prepared from the following raw materials in parts by mass: 4 parts of bentonite, 12-6 parts of polyamine alcohol AP-12, 0.2-0.6 part of carboxymethyl cellulose, 0.25-1 part of sulfomethyl phenolic resin, 0.25-2 parts of the 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 following technical characteristics and beneficial effects:
the environment-friendly cementing wall-fixing agent contains a ternary copolymer of allyl alcohol, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid, and a polymer prepared from the specific monomer can be adsorbed on shale through a hydrogen bond through amide groups, hydroxyl groups, sulfonic groups and other groups on a long chain of a molecule; the tannic acid molecules in the wall-fixing agent have a large number of hydroxyl groups, and the tannic acid molecules tightly connect the polymer and the shale surface through strong hydrogen bonds to play a role in cementing cracks. In the process of drilling, the wall consolidating agent can consolidate rock particles, enhance the strength of a 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 the hydration expansion and dispersion of the shale and play a role in stabilizing the well wall. The wall-fixing agent is environment-friendly and low in cost, can effectively stabilize the shale well wall, and is used for the breakable shale formation drilling fluid.
Detailed Description
The present invention will be described in detail below by way of examples, but the present invention is not limited thereto. In the following preparation examples, examples and comparative examples, materials used are commercially available unless otherwise specified, and the methods used are all conventional in the art.
Available from chemical agents of the propenol national groups.
Acrylamide was purchased from alatin.
Tannic acid, 2-acrylamido-2-methylpropanesulfonic acid, is supplied by sahn chemical technology (shanghai) ltd.
Polyacrylamide potassium salt, polyamine alcohol AP-1, carboxymethyl cellulose, sulfomethyl phenolic resin, sulfonated asphalt, FCLS and polymeric alcohol are provided by the institute of Petroleum engineering and technology, Inc.
The polymers used in examples 1 to 5 and comparative examples 1 to 3 were prepared according to the method of preparation example 1.
Preparation example 1
The preparation method of the polymer comprises the following steps:
adding 10g of allyl alcohol into a three-neck flask filled with 100g of deionized water, and adding 10% by mass of potassium hydroxide solution to adjust the pH of the system to 8.5; then placing the three-neck flask in a water bath, 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 potassium persulfate aqueous solution with the mass fraction of 0.8%, and reacting at 50 ℃ for 4h 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
A preparation method of an environment-friendly cementing type wall fixing agent for water-based drilling fluid comprises the following steps:
1g of the polymer was charged into a flask containing 100g of deionized water, and the polymer was dissolved by stirring at a stirring rate of 60 rpm; 0.2g 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 A for the water-based drilling fluid 1 。
Example 2
A preparation method of an environment-friendly cementing type wall fixing agent for water-based drilling fluid comprises the following steps:
2g of the polymer was charged into a flask containing 100g of deionized water, and the polymer was dissolved by stirring at a stirring rate of 60 rpm; 0.4g 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 A for the water-based drilling fluid 2 。
Example 3
A preparation method of an environment-friendly cementing type wall fixing agent for water-based drilling fluid comprises the following steps:
3g of the polymer was charged into a flask containing 100g of deionized water, and the polymer was dissolved by stirring at a stirring rate of 60 rpm; 0.6g 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 A for the water-based drilling fluid 3 。
Example 4
A preparation method of an environment-friendly cementing type wall fixing agent for water-based drilling fluid comprises the following steps:
1g of the polymer was charged into a flask containing 100g of deionized water, and the polymer was dissolved by stirring at a stirring rate of 60 rpm; 0.3g 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 A for the water-based drilling fluid 4 。
Example 5
A preparation method of an environment-friendly cementing type wall fixing agent for water-based drilling fluid comprises the following steps:
1g of the polymer was charged into a flask containing 100g of deionized water, and the polymer was dissolved by stirring at a stirring rate of 60 rpm; 0.4g 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 A for the water-based drilling fluid 5 。
Comparative example 1
A preparation method of a wall fixing agent for water-based drilling fluid comprises the following steps:
2g of polymer is added into a flask containing 100g of deionized water, and the polymer is dissolved by stirring at the stirring speed of 60rpm, and the obtained polymer solution is the wall fixing agent D for the water-based drilling fluid 1 。
In the comparative example, tannic acid is not added, and only the terpolymer of the allyl alcohol, the acrylamide and the 2-acrylamide-2-methylpropanesulfonic acid is taken as a wall-fixing agent.
Comparative example 2
A preparation method of an environment-friendly cementing type wall fixing agent for water-based drilling fluid comprises the following steps:
2g of the polymer was charged into a flask containing 100g of deionized water, and the polymer was dissolved by stirring at a stirring rate of 60 rpm; 0.2g 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 2 。
The ratio of polymer to tannic acid in this comparative example is too small.
Comparative example 3
A preparation method of an environment-friendly cementing type wall fixing agent for water-based drilling fluid comprises the following steps:
2g of the polymer was charged into a flask containing 100g of deionized water, and the polymer was dissolved by stirring at a stirring rate of 60 rpm; weighing 1.0g of tannic acid, adding the tannic acid into the polymer solution, and fully stirring the mixture for 20min at a 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 is too large in this comparative example.
Comparative example 4
A preparation method of an environment-friendly cementing type wall fixing agent for water-based drilling fluid comprises the following steps:
(1) preparation of the polymer:
100g of deionized water is taken, 10 percent by mass of potassium hydroxide solution is added to adjust the pH value to 8.5, and then the mixture is transferred into a three-neck flask. Placing a three-neck flask in a water bath, 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 potassium persulfate aqueous solution with the mass fraction of 0.8%, and reacting at 50 ℃ for 4h 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
2g of the polymer obtained in step (1) was put into a flask containing 100g of deionized water, and the polymer was dissolved by stirring at a stirring rate of 60 rpm; 0.4g 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 4 。
The polymer used in this comparative example was acrylamide 2-acrylamide-2-methylpropanesulfonic acid copolymer.
Comparative example 5
A preparation method of an environment-friendly cementing type wall fixing agent for water-based drilling fluid comprises the following steps:
(1) preparation of the polymer:
adding 10g of sodium styrene sulfonate into a three-neck flask filled with 100g of deionized water, and adding 10% by mass of potassium hydroxide solution to adjust the pH value of the system to 8.5; then placing the three-neck flask in a water bath, 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 potassium persulfate aqueous solution with the mass fraction of 0.8%, and reacting at 50 ℃ for 4h 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) Preparing a wall fixing agent:
2g of the polymer obtained in step (1) was put into a flask containing 100g of deionized water, and the polymer was dissolved by stirring at a stirring rate of 60 rpm; 0.4g 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 5 。
Test example 1
Putting 30g of 10-mesh shale debris into a die former (D is 15mm), adding 3mL of distilled water, and pressing for 5 minutes under the condition of 10MPa to obtain a core; respectively preparing the wall firming agents prepared in the examples and the comparative examples into aqueous solutions with the mass fraction of 0.5%; and respectively placing the rock core in different wall fixing agent solutions for soaking for 24h, observing the integrity of the rock core, and testing results are shown in table 1.
TABLE 1 integrity of cores after 24h immersion in different wall-fixating agent solutions
The data in table 1 show that the environment-friendly cementing type wall consolidating agent can effectively consolidate shale particles, further effectively consolidate shale cracks and play a role in stabilizing the well wall of a fractured stratum. From the experimental results of comparative examples 1 to 3, it is understood that the lack of tannic acid in the wall-fixing agent or the low mass ratio of the polymer to tannic acid results in the deterioration of the wall-fixing effect. The reduction in tannin content in the wall-fixating agent reduces the cohesive strength of the wall-fixating agent, and thus, the core soaked in the solution collapses. If the content of tannic acid in the wall-fixing agent is too high, the tannic acid can excessively bind with the polymer to form solid precipitates, and the performance of the wall-fixing agent can be greatly reduced. The polymers used in the wall-fixing agents of comparative examples 4 to 5 did not contain propenol, and had poor adsorption properties with shale, and thus the wall-fixing agents obtained had poor properties.
Test example 2
The drilling fluid is prepared according to the following formula: 4 parts of bentonite, 16 parts of polyamine alcohol AP-16 parts, 0.6 part of carboxymethyl cellulose, 1 part of sulfomethyl phenolic resin, 1 part of a wall-fixing agent, 1 part of sulfonated asphalt, 1 part of FCLS, 2 parts of polymeric alcohol and 400 parts of water; the wall fixing agents are respectively prepared in examples 1-3 and comparative examples 1-5, drilling fluids obtained by adding the wall fixing agents in examples 1-3 are respectively marked as F1, F2 and F3, and drilling fluids obtained by adding the wall fixing agents in comparative examples 1-5 are respectively marked as DF1, DF2, DF3, DF4 and DF 5.
The above drilling fluids were subjected to the following performance tests
(1) And (3) rheological property testing:
400mL of the drilling fluid prepared above was taken and stirred at 3000rpm for 20min, and then the apparent viscosity (AV, mPa.s), plastic viscosity (PV, mPa.s), dynamic shear force (YP, Pa), 10s and 10min static shear force, and medium pressure API water loss (FL, mL) of the drilling fluid were measured according to GB/T16783.1-2006, and the results are shown in Table 2.
TABLE 2 drilling fluid Properties
The data in table 2 show that the environment-friendly cementing type wall fixing agent can effectively reduce the water loss of the water-based drilling fluid, can effectively reduce the entering of filtrate into the stratum in the drilling process, and plays a role in stabilizing the wall of a fractured stratum well, and the medium-pressure API water loss of the drilling fluid is lower along with the increase of the addition of the polymer and the tannic acid in the wall fixing agent, but the influence on the water loss of the drilling fluid is not greatly influenced by the continuous increase of the addition of the polymer and the tannic acid, so that the addition of the polymer and the tannic acid is controlled within the scope of the invention. From the experimental results of comparative examples 1 to 3, it is known that if the wall-fixing agent lacks tannic acid, the mass ratio of the polymer to tannic acid is too high or too low, and the fluid loss property of the wall-fixing agent is reduced. From the experimental results of comparative examples 4-5, it was found that if the allyl alcohol monomer is absent or replaced by another monomer, the fluid loss performance of the wall-fixing agent is also reduced.
(2) Shale expansion ratio test
The experimental method for testing the shale expansion rate comprises the following steps:
the measurement was carried out using a linear expansion rate measuring instrument (CPZ-II, purchased from constant Tada, Inc., Qingdao).
The shale is crushed into powder by a crusher and sieved by a 100-mesh sieve. Then placing the shale powder which is sieved by a 100-mesh sieve into a mould, adding the shale powder to a constant pressure of 10MPa by using a SYB-19 hydraulic manual pump, waiting for 5 minutes, and taking out to obtain the shale slices.
The shale pieces were placed in the sample cell of a linear dilatometer and the final expansion rate shown on the linear dilatometer was read after soaking for 16h with water-based drilling fluid (formulated in drilling fluid as described in rheological measurements) with the wall-fixing agent prepared in examples 1-3 and comparative examples 1-5, respectively, and deionized water. And the results are shown in Table 3, comparing with potassium polyacrylamide.
TABLE 3 inhibition of shale hydration swelling performance by drilling fluid
Comparing the results of examples 1-3 and comparative examples 1-5 in table 3, and the polyacrylamide potassium salt and deionized water, it can be seen that the water-based drilling fluid containing the environment-friendly cementing type wall fixing agent of the invention can significantly reduce the expansion rate of shale, inhibit the hydration expansion of shale, and enhance the borehole wall stability of fractured formations.
(3) Shale compression strength test
Shale cores (25cm multiplied by 30cm) are respectively added into the drilling fluid (prepared in the drilling fluid as described in rheological property test) obtained by adding the wall fixing agent prepared in examples 1-3 and comparative examples 1-5 and the polyacrylamide potassium salt and deionized water, and the compressive strength of the drilling fluid and the deionized water are measured after the drilling fluid and the deionized water are soaked for 24 hours, and an original core is taken as a comparison. The results are shown in Table 4.
TABLE 4 shale compressive Strength
As can be seen from Table 4, as the addition of the wall-fixing agent increases, the compressive strength of the core is higher, which indicates that the drilling fluid containing the environment-friendly cementing type wall-fixing agent can effectively consolidate the shale core and improve the compressive strength of the shale core. In the drilling operation, the water-based drilling fluid can stabilize the well wall of a fractured stratum, prevent the well wall from collapsing and reduce the occurrence of underground complex conditions.
The data show that the environment-friendly cementing type wall fixing agent can cement the formation cracks, improve the rock strength, inhibit the hydration and dispersion of the shale and reduce the filtration loss of the drilling fluid; the wall modifier is environment-friendly, has low cost, can effectively stabilize the shale well wall, and is used for the fractured shale stratum drilling fluid
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. An environment-friendly cementing type wall fixing agent for water-based drilling fluid is characterized in that 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.
2. The environment-friendly cementing type wall fixing agent for the water-based drilling fluid as claimed in claim 1, wherein the polymer is prepared by the following method:
adding allyl alcohol into water, adjusting 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; and after the reaction is finished, drying and crushing the obtained reaction liquid to obtain the polymer.
3. The environment-friendly cementing type wall fixing agent for the water-based drilling fluid as claimed in claim 2, wherein the mass ratio of the allyl alcohol to the water is 0.1-0.2: 1.
4. The environment-friendly cementing type wall fixing agent for the water-based drilling fluid as claimed in claim 2, wherein a potassium hydroxide solution with the mass fraction of 10% is used for adjusting the pH of the system to 8-9, and the reaction temperature is 50-60 ℃.
5. The environment-friendly cementing type wall fixing agent for the water-based drilling fluid as claimed in claim 2, wherein 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.
6. The environment-friendly cementing type wall-fixing agent for the water-based drilling fluid as claimed in claim 2, wherein the initiator is one or a combination of more than two of potassium persulfate, sodium bisulfite and azodiisobutyl 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 methyl propanesulfonic acid; the mass fraction of the initiator aqueous solution is 0.5-1%.
7. The environment-friendly cementing type wall fixing agent for the water-based drilling fluid as claimed in claim 2, wherein the polymerization reaction time is 3-5 h; the drying is carried out at 70-90 ℃ to constant weight.
8. The method for preparing the environment-friendly cementing type wall fixing agent for the water-based drilling fluid as claimed in any one of claims 1 to 7, which comprises the following steps:
and sequentially adding the polymer and the tannic acid into the water, and uniformly stirring to obtain the environment-friendly cementing type wall-fixing agent for the water-based drilling fluid.
9. The use of the environmentally friendly consolidating type wall-fixing agent for water-based drilling fluids of any of claims 1 to 7 in water-based drilling fluids for fractured formations.
10. The water-based drilling fluid for the fractured stratum is characterized by comprising the following raw materials in parts by mass: 4 parts of bentonite, 12-6 parts of polyamine alcohol AP-12, 0.2-0.6 part of carboxymethyl cellulose, 0.25-1 part of sulfomethyl phenolic resin, 0.25-2 parts of the environment-friendly cementing type wall fixing agent for the water-based drilling fluid as claimed in any one of claims 1-7, 0.25-2 parts of sulfonated asphalt, 0.25-2 parts of FCLS, 0.5-2 parts of polyalcohol and 400 parts of water.
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| CN115231852A (en) * | 2022-08-18 | 2022-10-25 | 北京砼固新材料科技有限公司 | Proliferation type concrete compacting agent and preparation method thereof |
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