CN112679648B - High-temperature-resistant filtrate reducer for drilling fluid and preparation method thereof - Google Patents
High-temperature-resistant filtrate reducer for drilling fluid and preparation method thereof Download PDFInfo
- Publication number
- CN112679648B CN112679648B CN202011560303.0A CN202011560303A CN112679648B CN 112679648 B CN112679648 B CN 112679648B CN 202011560303 A CN202011560303 A CN 202011560303A CN 112679648 B CN112679648 B CN 112679648B
- Authority
- CN
- China
- Prior art keywords
- drilling fluid
- temperature
- loss additive
- dimethylchlorosilane
- fluid loss
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses a high-temperature resistant fluid loss additive for drilling fluid and a preparation method thereof, wherein the fluid loss additive is a cross-linked copolymer formed by polymerizing acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, N-vinyl pyrrolidone and hydroxybutyl vinyl ether under the initiation of an initiator and then reacting with dimethylchlorosilane; the weight ratio of the acrylic acid, the 2-acrylamide-2-methylpropanesulfonic acid, the N-vinyl pyrrolidone, the hydroxybutyl vinyl ether and the dimethylchlorosilane is (30-40): 10-15): 5-10); the high-temperature resistant fluid loss additive for the drilling fluid is prepared by copolymerizing acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, N-vinyl pyrrolidone and hydroxybutyl vinyl ether to increase the hydroxyl content of a branched chain of a copolymer, and then performing hydrolysis reaction on the copolymer and dimethylchlorosilane to generate a spatial cross-linking reaction between copolymer chain segments to form a cross-linked copolymer with a three-dimensional network structure, so that the aim of improving the temperature resistance of a product is fulfilled.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas, in particular to a high-temperature resistant filtrate reducer for drilling fluid and a preparation method thereof.
Background
As petroleum exploration and development begin to develop towards deep land layers, complex strata and ocean deep water, higher and higher temperature resistance requirements are put forward on drilling fluid technology. The drilling fluid filtrate reducer is an important drilling fluid treating agent for ensuring the stable performance of the drilling fluid, reducing harmful liquid from invading stratum, ensuring the well diameter regulation and stabilizing well wall. During drilling, the invasion of the filtrate of the drilling fluid into the formation causes the shale to hydrate and swell, and in severe cases, causes various downhole complications and wellbore instability. The filtrate reducer is used in the largest amount and various types in the drilling fluid treating agent, and mainly comprises natural materials or natural material modified products and synthetic polymers.
Disclosure of Invention
The invention aims to provide a high-temperature resistant fluid loss additive for drilling fluid, which can form a hydrophobic membrane on a well wall, reduce the invasion of free water and improve the temperature resistance of a product by adopting polymerization crosslinking modification
The invention also aims to provide a preparation method of the high-temperature-resistant fluid loss additive for the drilling fluid.
Therefore, the technical scheme of the invention is as follows:
a high-temperature resistant fluid loss additive for drilling fluid is a cross-linked copolymer formed by polymerizing acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, N-vinyl pyrrolidone and hydroxybutyl vinyl ether under the initiation of an initiator and then reacting with dimethylchlorosilane; the weight ratio of acrylic acid, 2-acrylamide-2-methyl propane sulfonic acid, N-vinyl pyrrolidone, hydroxybutyl vinyl ether and dimethylchlorosilane is (30-40): 10-15): 5-10.
Preferably, the initiator is a mixture of ammonium persulfate and sodium bisulfite in a weight ratio of 2: 1.
Preferably, the amount of initiator is 0.2% of the total weight of acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, N-vinylpyrrolidone, hydroxybutyl vinyl ether and dimethylchlorosilane.
A preparation method of the high-temperature-resistant fluid loss additive for the drilling fluid comprises the following steps:
s1, dissolving acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, N-vinyl pyrrolidone and hydroxybutyl vinyl ether in solvent water, and adding caustic soda flakes to adjust the pH value of the solution to 9-12 to prepare a monomer reaction solution;
s2, adding the monomer reaction solution into a reactor, and introducing nitrogen into the reactor to maintain for 10 min;
s3, heating the monomer reaction solution to 40-50 ℃, adding an initiator into the monomer reaction solution, and reacting for 3-5 hours;
s4, dropwise adding dimethylchlorosilane into the reactor, always using caustic soda flakes to adjust the pH value of the solution to be 9-12 in the dropwise adding process, and continuously reacting for 1-2 hours under the condition of keeping the temperature to be 40-50 ℃; then heating to 120 ℃, and reacting for 2-3 h to obtain a glue solution product;
s5, drying the product obtained in the step S4 for 12 hours at 90 ℃ in an oven, and crushing to obtain the high-temperature resistant fluid loss additive for the drilling fluid.
Preferably, in step S1, the solvent water is added in an amount of 2.5 to 4 times the total weight of acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, N-vinylpyrrolidone, hydroxybutyl vinyl ether, and dimethylchlorosilane.
Compared with the prior art, the high-temperature resistant fluid loss additive for the drilling fluid is prepared by copolymerizing acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, N-vinyl pyrrolidone and hydroxybutyl vinyl ether to increase the hydroxyl content of a branched chain of a copolymer, and then performing hydrolysis reaction on the copolymer and dimethylchlorosilane to generate a spatial crosslinking reaction between copolymer chain segments to form a crosslinked copolymer with a three-dimensional network structure, so that the aim of improving the temperature resistance of a product is fulfilled.
Detailed Description
The present invention will be further described with reference to the following examples, which are not intended to limit the invention in any way.
Example 1
A preparation method of a high-temperature resistant fluid loss additive for drilling fluid comprises the following steps:
s1, dissolving 30g of acrylic acid, 10g of 2-acrylamido-2-methylpropanesulfonic acid, 10g N-vinylpyrrolidone and 5g of hydroxybutyl vinyl ether in 240g of solvent water, and adding caustic soda flakes to adjust the pH value of the solution to 9 to prepare a monomer reaction solution;
s2, adding the monomer reaction solution into a reactor, and introducing nitrogen into the reactor to maintain for 10 min;
s3, heating the monomer reaction solution to 40 ℃, adding 0.04g of sodium bisulfite and 0.08g of ammonium persulfate into the monomer reaction solution, and reacting for 3 hours;
s4, dropwise adding 5g of dimethylchlorosilane into the reactor, adjusting the pH value of the solution to be 9 by using caustic soda flakes all the time in the dropwise adding process, and continuously reacting for 1h under the condition of keeping the temperature at 40 ℃; then heating to 120 ℃, and reacting for 2h to obtain a glue solution product;
s5, drying the product obtained in the step S4 for 12 hours at 90 ℃ in an oven, and crushing to obtain the high-temperature resistant fluid loss additive for the drilling fluid.
Example 2
A preparation method of a high-temperature resistant fluid loss additive for drilling fluid comprises the following steps:
s1, dissolving 40g of acrylic acid, 15g of 2-acrylamido-2-methylpropanesulfonic acid, 15g N-vinylpyrrolidone and 10g of hydroxybutyl vinyl ether in 210g of solvent water, and adding caustic soda flakes to adjust the pH value of the solution to 12 to obtain a monomer reaction solution;
s2, adding the monomer reaction solution into a reactor, and introducing nitrogen into the reactor to maintain for 10 min;
s3, heating the monomer reaction solution to 50 ℃, adding 0.06g of sodium bisulfite and 0.12g of ammonium persulfate, and reacting for 5 hours;
s4, dropwise adding 10g of dimethylchlorosilane into the reactor, adjusting the pH value of the solution to be 12 by using caustic soda flakes all the time in the dropwise adding process, and continuously reacting for 2 hours under the condition of keeping the temperature at 50 ℃; then heating to 120 ℃, and reacting for 3h to obtain a glue solution product;
s5, drying the product obtained in the step S4 for 12 hours at 90 ℃ in an oven, and crushing to obtain the high-temperature resistant fluid loss additive for the drilling fluid.
Example 3
A preparation method of a high-temperature resistant fluid loss additive for drilling fluid comprises the following steps:
s1, dissolving 35g of acrylic acid, 12g of 2-acrylamido-2-methylpropanesulfonic acid, 12g N-vinylpyrrolidone and 8g of hydroxybutyl vinyl ether in 225g of solvent water, and adding caustic soda flakes to adjust the pH value of the solution to 11 to prepare a monomer reaction solution;
s2, adding the monomer reaction solution into a reactor, and introducing nitrogen into the reactor to maintain for 10 min;
s3, heating the monomer reaction solution to 50 ℃, adding 0.05g of sodium bisulfite and 0.10g of ammonium persulfate, and reacting for 5 hours;
s4, dropwise adding 8g of dimethylchlorosilane into the reactor, adjusting the pH value of the solution to be 10 by using caustic soda flakes all the time in the dropwise adding process, and continuously reacting for 1.5h under the condition of keeping the temperature at 45 ℃; then heating to 120 ℃, and reacting for 2.5h to obtain a glue solution product;
s5, drying the product obtained in the step S4 for 12 hours at 90 ℃ in an oven, and crushing to obtain the high-temperature resistant fluid loss additive for the drilling fluid.
Comparative example 1
A preparation method of a high-temperature resistant fluid loss additive for drilling fluid comprises the following steps:
s1, dissolving 30g of acrylic acid, 10g of 2-acrylamido-2-methylpropanesulfonic acid and 10g N-vinyl pyrrolidone in 240g of solvent water, and adding caustic soda flakes to adjust the pH value of the solution to 9 to prepare a monomer reaction solution;
s2, adding the monomer reaction solution into a reactor, and introducing nitrogen into the reactor to maintain for 10 min;
s3, heating the monomer reaction solution to 40 ℃, adding 0.04g of sodium bisulfite and 0.08g of ammonium persulfate into the monomer reaction solution, and reacting for 3 hours;
s4, dropwise adding 5g of dimethylchlorosilane into the reactor, adjusting the pH value of the solution to be 9 by using caustic soda flakes all the time in the dropwise adding process, and continuously reacting for 1h under the condition of keeping the temperature at 40 ℃; then heating to 120 ℃, and reacting for 2h to obtain a glue solution product;
s5, drying the product obtained in the step S4 for 12 hours at 90 ℃ in an oven, and crushing to obtain the high-temperature resistant fluid loss additive for the drilling fluid.
Comparative example 2
A preparation method of a high-temperature resistant fluid loss additive for drilling fluid comprises the following steps:
s1, dissolving 30g of acrylic acid, 10g of 2-acrylamido-2-methylpropanesulfonic acid, 10g N-vinylpyrrolidone and 5g of hydroxybutyl vinyl ether in 240g of solvent water, and adding caustic soda flakes to adjust the pH value of the solution to 9 to prepare a monomer reaction solution;
s2, adding the monomer reaction solution into a reactor, and introducing nitrogen into the reactor to maintain for 10 min;
s3, heating the monomer reaction solution to 40 ℃, adding 0.04g of sodium bisulfite and 0.08g of ammonium persulfate into the monomer reaction solution, and reacting for 3 hours;
s4, drying the product obtained in the step S4 for 12 hours at 90 ℃ in an oven, and crushing to obtain the high-temperature resistant fluid loss additive for the drilling fluid.
And (3) performance testing:
referring to GB16783.1-2014 oil and gas industry drilling fluid field test first part: water-based drilling fluid, the viscosity and fluid loss performance of the high-temperature-resistant fluid loss additive for drilling fluid prepared in examples 1 to 3 and comparative examples 1 to 2 were evaluated in 4 wt.% bentonite-based slurry. Wherein, the test sample is prepared by adding 1.5 wt.% of high-temperature resistant fluid loss additive for drilling fluid into 4 wt.% of bentonite-based slurry.
The test results are shown in table 1 below.
Table 1:
as can be seen from the test results in table 1, the high-temperature-resistant fluid loss additive for drilling fluids prepared in examples 1 to 3 has a good fluid loss reducing effect when the addition amount of 1.5 wt.% to 4 wt.% of bentonite-based slurry, and still maintains the good fluid loss reducing effect after curing at 200 ℃ for 16 hours, and shows good temperature resistance; in the preparation process of the high-temperature resistant filtrate reducer for drilling fluid prepared in the comparative example 1, hydroxy is introduced without adding hydroxybutyl vinyl ether, so that the copolymer cannot realize spatial crosslinking with dimethylchlorosilane, and the temperature resistance effect of the product is obviously weakened; in contrast, no dimethylchlorosilane is added in the comparative example 2, so that no space crosslinking is carried out between the copolymers, and only the linear copolymer is formed, so that the temperature resistance of the product is obviously weakened.
Claims (5)
1. The high-temperature-resistant fluid loss additive for the drilling fluid is characterized by being a cross-linked copolymer formed by polymerizing acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, N-vinyl pyrrolidone and hydroxybutyl vinyl ether under the initiation of an initiator and then reacting with dimethylchlorosilane; wherein the weight ratio of acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, N-vinyl pyrrolidone, hydroxybutyl vinyl ether and dimethylchlorosilane is (30-40): (10-15): 5-10.
2. The high-temperature-resistant fluid loss additive for drilling fluid as claimed in claim 1, wherein the initiator is a mixture of ammonium persulfate and sodium bisulfite in a weight ratio of 2: 1.
3. The high temperature resistant fluid loss additive for drilling fluid according to claim 1, wherein the amount of the initiator is 0.2% of the total weight of acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, N-vinylpyrrolidone, hydroxybutyl vinyl ether and dimethylchlorosilane.
4. The preparation method of the high-temperature-resistant fluid loss additive for the drilling fluid as defined in any one of claims 1-3, wherein the steps are as follows:
s1, dissolving acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, N-vinyl pyrrolidone and hydroxybutyl vinyl ether in solvent water, and adding caustic soda flakes to adjust the pH value of the solution to 9-12 to prepare a monomer reaction solution;
s2, adding the monomer reaction solution into a reactor, and introducing nitrogen into the reactor to maintain for 10 min;
s3, heating the monomer reaction solution to 40-50 ℃, adding an initiator into the monomer reaction solution, and reacting for 3-5 hours;
s4, dropwise adding dimethylchlorosilane into the reactor, always using caustic soda flakes to adjust the pH value of the solution to be 9-12 in the dropwise adding process, and continuously reacting for 1-2 hours under the condition of keeping the temperature to be 40-50 ℃; then heating to 120 ℃, and reacting for 2-3 h to obtain a glue solution product;
s5, drying the product obtained in the step S4 for 12 hours at 90 ℃ in an oven, and crushing to obtain the high-temperature resistant fluid loss additive for the drilling fluid.
5. The method for preparing the high-temperature-resistant fluid loss additive for drilling fluid according to claim 4, wherein in step S1, the addition amount of solvent water is 2.5-4 times of the total weight of acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, N-vinylpyrrolidone, hydroxybutyl vinyl ether and dimethylchlorosilane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011560303.0A CN112679648B (en) | 2020-12-25 | 2020-12-25 | High-temperature-resistant filtrate reducer for drilling fluid and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011560303.0A CN112679648B (en) | 2020-12-25 | 2020-12-25 | High-temperature-resistant filtrate reducer for drilling fluid and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112679648A CN112679648A (en) | 2021-04-20 |
| CN112679648B true CN112679648B (en) | 2021-11-23 |
Family
ID=75451597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011560303.0A Active CN112679648B (en) | 2020-12-25 | 2020-12-25 | High-temperature-resistant filtrate reducer for drilling fluid and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112679648B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116217796B (en) * | 2023-03-15 | 2023-10-03 | 上海宇昂水性新材料科技股份有限公司 | Multi-copolymer based on N-vinyl pyrrolidone and preparation method and application thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009141007A1 (en) * | 2008-05-21 | 2009-11-26 | Basf Construction Polymers Gmbh | Graft copolymer, method for the production thereof, and use thereof |
| DK3013875T3 (en) * | 2013-06-27 | 2020-05-18 | Isp Investments Llc | A HIGH-TEMPERATURE AND HIGH-PRESSURE (HTHP) STABLE SYNTHETIC POLYMER FOR WATER-BASED OIL BREAD SERVICE FLUIDS |
| CN103710008B (en) * | 2013-12-29 | 2016-09-07 | 哈尔滨工业大学 | A kind of high temperature resistant drilling fluids fluid loss additive and preparation method thereof |
| CN104388061A (en) * | 2014-09-29 | 2015-03-04 | 中国石油天然气集团公司 | High-temperature-resistant salt-resistant polymer filtrate reducer used in water-based drilling fluid and preparation method thereof |
| CN108774509A (en) * | 2018-05-30 | 2018-11-09 | 山东得顺源石油科技有限公司 | A kind of drilling fluid heat and salinity tolerance high temperature and pressure fluid loss additive and preparation method thereof |
| CN111647109A (en) * | 2020-05-28 | 2020-09-11 | 中国石油集团渤海钻探工程有限公司 | Modified starch fluid loss additive and preparation method thereof |
-
2020
- 2020-12-25 CN CN202011560303.0A patent/CN112679648B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112679648A (en) | 2021-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109705834B (en) | Composition, temperature-resistant salt-resistant fracturing fluid thickening agent prepared from composition and preparation method of thickening agent | |
| CN112194755B (en) | Preparation method of temperature-sensitive flow type regulator for deepwater water-based drilling fluid | |
| CN111875758A (en) | Preparation method of environment-friendly ultra-high temperature resistant filtrate reducer for water-based drilling fluid | |
| CN111454401B (en) | Graft-modified temperature-sensitive thickening polymer and preparation method and application thereof | |
| CN114989348B (en) | High-temperature-resistant salt-resistant organosilicon fluid loss additive and preparation method and application thereof | |
| CN112679648B (en) | High-temperature-resistant filtrate reducer for drilling fluid and preparation method thereof | |
| CN104449655B (en) | Fracture-cavern type oil reservoir filtrate reducer composition and fracture-cavern type oil reservoir filtrate reducing method | |
| CN110066647B (en) | High-temperature-resistant air-stagnation plug for well drilling and preparation method thereof | |
| CN114989351B (en) | Low-molecular-weight high-temperature-resistant and saturated-salt-resistant filtrate reducer for water-based drilling fluid, and preparation method and application thereof | |
| CN111647109A (en) | Modified starch fluid loss additive and preparation method thereof | |
| CN112979870B (en) | Instant drag reducer and preparation method thereof | |
| CN114456325B (en) | Wall fixing agent with hydrophobic membrane structure and preparation method and application thereof | |
| CN107814870B (en) | Spherical polymer treating agent for high-temperature-resistant drilling fluid and preparation method thereof | |
| CN112574725B (en) | High-temperature-resistant high-density water-based drilling fluid and preparation method thereof | |
| CN113122199B (en) | Medium-high temperature strong-plugging hard rubber micro-foam drilling fluid and preparation method thereof | |
| CN111139039B (en) | Sulfonated phenolic resin graft modified polymer filtrate reducer and preparation method thereof | |
| CN111139042B (en) | Resin modified polymer fluid loss agent based on degradation and preparation method thereof | |
| CN115181211B (en) | Branched high-temperature-resistant polymer filtrate reducer for drilling fluid and preparation method thereof | |
| CN109749009B (en) | Preparation method of anti-drag film composition | |
| CN108264587B (en) | High-temperature-resistant water-based drilling fluid filtrate reducer and preparation method and application thereof | |
| CN111732689A (en) | Expansion type fluid loss agent and preparation method thereof | |
| CN115850579B (en) | Salt-resistant low-temperature early-strength fluid loss agent and preparation method thereof | |
| CN116253837A (en) | Salt-resistant temperature-resistant filtrate reducer for drilling fluid and preparation method thereof | |
| CN113943566B (en) | Temperature-resistant reinforcing agent and fracturing fluid | |
| CN115947887B (en) | Tackifier for drilling fluid and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |