CN111363524A - High-temperature-resistant, salt-resistant and anti-collapse filtrate reducer for drilling fluid - Google Patents
High-temperature-resistant, salt-resistant and anti-collapse filtrate reducer for drilling fluid Download PDFInfo
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- CN111363524A CN111363524A CN202010190421.0A CN202010190421A CN111363524A CN 111363524 A CN111363524 A CN 111363524A CN 202010190421 A CN202010190421 A CN 202010190421A CN 111363524 A CN111363524 A CN 111363524A
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- cellulose
- resistant
- temperature
- sulfonated
- salt
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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
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B11/00—Preparation of cellulose ethers
- C08B11/02—Alkyl or cycloalkyl ethers
- C08B11/04—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals
- C08B11/10—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals
- C08B11/12—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals substituted with carboxylic radicals, e.g. carboxymethylcellulose [CMC]
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B15/00—Preparation of other cellulose derivatives or modified cellulose, e.g. complexes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
- C09K8/10—Cellulose or derivatives thereof
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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
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
- C09K8/206—Derivatives of other natural products, e.g. cellulose, starch, sugars
Abstract
The invention provides a high-temperature-resistant, salt-resistant and anti-collapse filtrate reducer for drilling fluid, and relates to the field of drilling. The high-temperature-resistant salt-resistant anti-collapse fluid loss additive for the drilling fluid is prepared by mixing sodium carboxymethylcellulose, sulfonated cellulose and grafted starch in proportion, and the production process of the fluid loss additive comprises the steps of cellulose treatment, preparation of the sodium carboxymethylcellulose and proportioning of the sulfonated cellulose and the fluid loss additive. The sulfonated cellulose and the grafted starch are added on the basis of the sodium carboxymethyl cellulose, so that the defect that the solution viscosity of the sodium carboxymethyl cellulose is reduced at high temperature is overcome.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to a high-temperature-resistant, salt-resistant and anti-collapse filtrate reducer for drilling fluid.
Background
During the drilling process, due to the action of the pressure difference, the water in the drilling fluid is inevitably lost to the stratum through the well wall, so that the drilling fluid loses water. As water enters the formation, clay particles in the drilling fluid adhere to the wellbore wall to form a "filter cake," forming a filter cake wellbore. As the well wall of the filter cake is much denser than the original well wall, the filter cake prevents the drilling fluid from further losing water on one hand and plays a role in protecting the well wall on the other hand. However, in the process of forming a filter cake well wall, the filtered water content is too much, the filter cake is too thick, and fine clay particles enter the stratum along with the water content, so that normal drilling is affected and the stratum is damaged. The filtration loss of the drilling fluid and the formation of a filter cake are inevitable during the drilling process, and the filter cake can be formed by the fluid loss additive to protect the well wall.
The single sodium carboxymethylcellulose filtrate reducer has the advantages of salt resistance, high temperature resistance and certain calcium resistance. However, at high temperature, the viscosity of the sodium carboxymethyl cellulose solution is reduced at high temperature, and the thickness of a filter cake formed on a well wall is reduced, so that the usability of the sodium carboxymethyl cellulose filtrate reducer is reduced.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a high-temperature-resistant, salt-resistant and anti-collapse filtrate reducer for drilling fluid, which solves the problem of reduced use performance of a sodium carboxymethylcellulose filtrate reducer at high temperature.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the high-temperature-resistant, salt-resistant and anti-sloughing filtrate reducer for the drilling fluid is prepared by mixing sodium carboxymethylcellulose, sulfonated cellulose and grafted starch in proportion.
Preferably, the proportion of grafted starch is higher as the temperature during drilling is higher.
Preferably, the preparation process of the high-temperature-resistant, salt-resistant and anti-collapse fluid loss additive for drilling fluid comprises the following steps:
s1 cellulose treatment
Crushing a cellulose raw material, and cooking at high temperature for 3-4 hours to form paper pulp;
preparation of S2 sodium carboxymethylcellulose
1. Alkalization of cellulose
Cooling the paper pulp to 40-60 ℃, slowly adding 50% sodium hydroxide solution into the container, wherein the mass ratio of the paper pulp to the sodium hydroxide solution is 1: 1, continuously stirring in the adding process of a sodium hydroxide solution until cellulose is alkalized, controlling the time to be 2-3 h, and controlling the temperature to be 40-60 ℃ in the alkalizing process;
2. synthesis of sodium carboxymethyl cellulose
Adding a monochloroacetic acid solution with the concentration of 40% into the alkalized cellulose mixed solution, wherein the mass ratio of the alkalized cellulose mixed solution to the monochloroacetic acid solution is 1: 1.0-1.5, continuously stirring in the addition process of the monochloroacetic acid solution until the reaction is finished, and controlling the time to be 0.5-1 h;
3. extraction and crushing of sodium carboxymethylcellulose
Evaporating the sodium carboxymethyl cellulose solution at low temperature and low pressure to obtain sodium carboxymethyl cellulose solid, crushing the sodium carboxymethyl cellulose solid into fine particles by using a crusher, and cleaning the fine particles by using ethanol for later use;
s3 sulfonated cellulose
1. Oxidation of cellulose
Adding an oxidant into the paper pulp to form aldehyde groups on cellulose molecular chains, controlling the temperature to be 30-60 ℃, and controlling the mass ratio of the paper pulp to the oxidant to be 1: 0.8-1.2, and continuously stirring when adding the oxidant;
2. sulfonation of cellulose
Adding a chlorosulfonic acid solution with the concentration of 60% into the oxidized cellulose mixed solution, controlling the temperature at 50-80 ℃, wherein the mass ratio of the oxidized cellulose mixed solution to the chlorosulfonic acid solution is 1: 1-2, adding chlorosulfonic acid solution by continuously stirring;
3. extraction and fragmentation of sulfonated cellulose
Evaporating the sulfonated cellulose solution at low temperature and low pressure to obtain sulfonated cellulose solid, and crushing the sulfonated cellulose solid into fine particles by using a crusher for later use;
s4 fluid loss additive mixture ratio
The filtrate reducer is prepared from sodium carboxymethylcellulose, sulfonated cellulose and grafted starch in a ratio of 1: 0.6-0.8: 0.1 to 0.3.
Preferably, the oxidant is hydrogen peroxide or ozone.
(III) advantageous effects
The invention provides a high-temperature-resistant, salt-resistant and anti-collapse filtrate reducer for drilling fluid. The method has the following beneficial effects:
1. according to the invention, the sulfonated cellulose and the grafted starch are added into the sodium carboxymethyl cellulose, so that the problem of reduced use performance of the sodium carboxymethyl cellulose filtrate reducer at high temperature can be solved, and the novel filtrate reducer has the advantages of high temperature resistance and salt resistance.
2. According to the invention, the raw materials of the fluid loss additive are all naturally available, the cost is low, and the production process of the fluid loss additive is simple.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the embodiment of the invention provides a high-temperature-resistant, salt-resistant and anti-collapse fluid loss additive for drilling fluid, which is prepared by mixing sodium carboxymethylcellulose, sulfonated cellulose and grafted starch in proportion, wherein carboxymethyl cellulose (CMC) is a modified product of cellulose, sodium salt of the CMC is widely applied to oil fields and is also called sodium carboxymethyl cellulose, and CMC is a fluid loss additive with strong salt resistance and temperature resistance and also has certain calcium resistance. The filtrate loss is reduced and the viscosity is increased, the thickness of a filter cake formed on a well wall is reduced, the performance is reduced, the viscosity at high temperature can be improved by adding the sulfonated cellulose and the grafted starch, and the sulfo group on the sulfonated cellulose has the advantage of high temperature resistance.
The grafted starch fraction is higher with higher temperatures during drilling.
Example two:
a manufacturing process of a high-temperature-resistant, salt-resistant and anti-collapse fluid loss agent for drilling fluid comprises the following steps:
s1 cellulose treatment
Crushing a cellulose raw material, and cooking at high temperature for 3-4 hours to form paper pulp;
preparation of S2 sodium carboxymethylcellulose
1. Alkalization of cellulose
Cooling the paper pulp to 60 ℃, and slowly adding 50% sodium hydroxide solution into the container, wherein the mass ratio of the paper pulp to the sodium hydroxide solution is 1: 1, continuously stirring until the cellulose is alkalized in the adding process of a sodium hydroxide solution, controlling the time to be 2 hours, and controlling the temperature to be 60 ℃ in the alkalization process;
2. synthesis of sodium carboxymethyl cellulose
Adding a monochloroacetic acid solution with the concentration of 40% into the alkalized cellulose mixed solution, wherein the mass ratio of the alkalized cellulose mixed solution to the monochloroacetic acid solution is 1: 1.5, continuously stirring in the addition process of the monochloroacetic acid solution until the reaction is finished, and controlling the time to be 0.5 h;
3. extraction and crushing of sodium carboxymethylcellulose
Evaporating the sodium carboxymethyl cellulose solution at low temperature and low pressure to obtain sodium carboxymethyl cellulose solid, crushing the sodium carboxymethyl cellulose solid into fine particles by using a crusher, and cleaning the fine particles by using ethanol for later use;
s3 sulfonated cellulose
1. Oxidation of cellulose
Adding an oxidant into the paper pulp to form aldehyde groups on cellulose molecular chains, controlling the temperature at 60 ℃, wherein the mass ratio of the paper pulp to the oxidant is 1: 1, continuously stirring the oxidant during adding;
2. sulfonation of cellulose
Adding a chlorosulfonic acid solution with the concentration of 60% into the oxidized cellulose mixed solution, controlling the temperature at 50-80 ℃, wherein the mass ratio of the oxidized cellulose mixed solution to the chlorosulfonic acid solution is 1: 2, adding chlorosulfonic acid solution by continuously stirring;
3. extraction and fragmentation of sulfonated cellulose
Evaporating the sulfonated cellulose solution at low temperature and low pressure to obtain sulfonated cellulose solid, and crushing the sulfonated cellulose solid into fine particles by using a crusher for later use;
s4 fluid loss additive mixture ratio
The filtrate reducer is prepared from sodium carboxymethylcellulose, sulfonated cellulose and grafted starch in a ratio of 1: 0.7: 0.3.
the oxidant is hydrogen peroxide or ozone, the atomic composition of the oxidant is hydrogen atoms and oxygen atoms, impurity atoms are not introduced in the oxidation process, and the cleaning work after extraction and crushing of the sulfonated cellulose is reduced.
Example three:
a manufacturing process of a high-temperature-resistant, salt-resistant and anti-collapse fluid loss agent for drilling fluid comprises the following steps:
s1 cellulose treatment
Crushing a cellulose raw material, and cooking at high temperature for 3-4 hours to form paper pulp;
preparation of S2 sodium carboxymethylcellulose
1. Alkalization of cellulose
Cooling the paper pulp to 50 ℃, and slowly adding 50% sodium hydroxide solution into the container, wherein the mass ratio of the paper pulp to the sodium hydroxide solution is 1: 1, continuously stirring until the cellulose is alkalized in the adding process of a sodium hydroxide solution, controlling the time to be 3 hours, and controlling the temperature to be 45 ℃ in the alkalization process;
2. synthesis of sodium carboxymethyl cellulose
Adding a monochloroacetic acid solution with the concentration of 40% into the alkalized cellulose mixed solution, wherein the mass ratio of the alkalized cellulose mixed solution to the monochloroacetic acid solution is 1: 1.2, continuously stirring in the addition process of the monochloroacetic acid solution until the reaction is finished, and controlling the time to be 1 h;
3. extraction and crushing of sodium carboxymethylcellulose
Evaporating the sodium carboxymethyl cellulose solution at low temperature and low pressure to obtain sodium carboxymethyl cellulose solid, crushing the sodium carboxymethyl cellulose solid into fine particles by using a crusher, and cleaning the fine particles by using ethanol for later use;
s3 sulfonated cellulose
1. Oxidation of cellulose
Adding an oxidant into the paper pulp to form aldehyde groups on cellulose molecular chains, controlling the temperature to be 40 ℃, wherein the mass ratio of the paper pulp to the oxidant is 1: 1.2, continuously stirring the oxidant;
2. sulfonation of cellulose
Adding a chlorosulfonic acid solution with the concentration of 60% into the oxidized cellulose mixed solution, controlling the temperature at 50 ℃, and controlling the mass ratio of the oxidized cellulose mixed solution to the chlorosulfonic acid solution to be 1: 1.8, adding chlorosulfonic acid solution by continuously stirring;
3. extraction and fragmentation of sulfonated cellulose
Evaporating the sulfonated cellulose solution at low temperature and low pressure to obtain sulfonated cellulose solid, and crushing the sulfonated cellulose solid into fine particles by using a crusher for later use;
s4 fluid loss additive mixture ratio
The filtrate reducer is prepared from sodium carboxymethylcellulose, sulfonated cellulose and grafted starch in a ratio of 1: 0.8: 0.2.
the oxidant is hydrogen peroxide or ozone, the atomic composition of the oxidant is hydrogen atoms and oxygen atoms, impurity atoms are not introduced in the oxidation process, and the cleaning work after extraction and crushing of the sulfonated cellulose is reduced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The high-temperature-resistant, salt-resistant and anti-collapse filtrate reducer for the drilling fluid is characterized in that: the filtrate reducer is prepared by mixing sodium carboxymethylcellulose, sulfonated cellulose and grafted starch in proportion.
2. The high-temperature-resistant, salt-resistant and anti-collapse fluid loss additive for drilling fluid as claimed in claim 1, wherein the high-temperature-resistant, salt-resistant and anti-collapse fluid loss additive is characterized in that: the grafted starch fraction is higher with higher temperature during drilling.
3. The preparation process of the high-temperature-resistant, salt-resistant and anti-collapse fluid loss agent for drilling fluid according to claim 1 is characterized in that: the method comprises the following steps:
s1 cellulose treatment
Crushing a cellulose raw material, and cooking at high temperature for 3-4 hours to form paper pulp;
preparation of S2 sodium carboxymethylcellulose
1. Alkalization of cellulose
Cooling the paper pulp to 40-60 ℃, slowly adding 50% sodium hydroxide solution into the container, wherein the mass ratio of the paper pulp to the sodium hydroxide solution is 1: 1, continuously stirring in the adding process of a sodium hydroxide solution until cellulose is alkalized, controlling the time to be 2-3 h, and controlling the temperature to be 40-60 ℃ in the alkalizing process;
2. synthesis of sodium carboxymethyl cellulose
Adding a monochloroacetic acid solution with the concentration of 40% into the alkalized cellulose mixed solution, wherein the mass ratio of the alkalized cellulose mixed solution to the monochloroacetic acid solution is 1: 1.0-1.5, continuously stirring in the addition process of the monochloroacetic acid solution until the reaction is finished, and controlling the time to be 0.5-1 h;
3. extraction and crushing of sodium carboxymethylcellulose
Evaporating the sodium carboxymethyl cellulose solution at low temperature and low pressure to obtain sodium carboxymethyl cellulose solid, crushing the sodium carboxymethyl cellulose solid into fine particles by using a crusher, and cleaning the fine particles by using ethanol for later use;
s3 sulfonated cellulose
1. Oxidation of cellulose
Adding an oxidant into the paper pulp to form aldehyde groups on cellulose molecular chains, controlling the temperature to be 30-60 ℃, and controlling the mass ratio of the paper pulp to the oxidant to be 1: 0.8-1.2, and continuously stirring when adding the oxidant;
2. sulfonation of cellulose
Adding a chlorosulfonic acid solution with the concentration of 60% into the oxidized cellulose mixed solution, controlling the temperature at 50-80 ℃, wherein the mass ratio of the oxidized cellulose mixed solution to the chlorosulfonic acid solution is 1: 1-2, adding chlorosulfonic acid solution by continuously stirring;
3. extraction and fragmentation of sulfonated cellulose
Evaporating the sulfonated cellulose solution at low temperature and low pressure to obtain sulfonated cellulose solid, and crushing the sulfonated cellulose solid into fine particles by using a crusher for later use;
s4 fluid loss additive mixture ratio
The filtrate reducer is prepared from sodium carboxymethylcellulose, sulfonated cellulose and grafted starch in a ratio of 1: 0.6-0.8: 0.1 to 0.3.
4. The preparation process of the high-temperature-resistant, salt-resistant and anti-collapse fluid loss agent for drilling fluid according to claim 3 is characterized in that: the oxidant is hydrogen peroxide or ozone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010190421.0A CN111363524A (en) | 2020-03-18 | 2020-03-18 | High-temperature-resistant, salt-resistant and anti-collapse filtrate reducer for drilling fluid |
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| CN202010190421.0A CN111363524A (en) | 2020-03-18 | 2020-03-18 | High-temperature-resistant, salt-resistant and anti-collapse filtrate reducer for drilling fluid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115521383A (en) * | 2022-10-31 | 2022-12-27 | 徐州创力纤维有限公司 | Preparation method of polyanion modified cellulose |
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| CN1126260A (en) * | 1994-05-27 | 1996-07-10 | 金伯特-克拉克公司 | Sulfonated cellulose and method of preparation |
| CN103740342A (en) * | 2014-01-09 | 2014-04-23 | 濮阳市诚信钻采助剂有限公司 | High temperature-resistant and salt-resistant fluid loss additive and preparation method thereof |
| CN104194746A (en) * | 2014-08-27 | 2014-12-10 | 克拉玛依市金鑫科技有限公司 | Biodegradable drilling fluid |
| CN104531102A (en) * | 2015-01-13 | 2015-04-22 | 北京培康佳业技术发展有限公司 | Natural polymer filtrate loss reducer used for drilling fluid and preparation method and application thereof |
| CN106517849A (en) * | 2015-09-10 | 2017-03-22 | 绵阳莫仕科技有限公司 | Oxidation-sulfonation starch water reducing agent preparation method |
| CN106675533A (en) * | 2016-12-23 | 2017-05-17 | 北京奥凯立科技发展股份有限公司 | Grafted starch filtration loss reduction agent used for drilling fluid and preparation method thereof |
| CN109233763A (en) * | 2018-10-26 | 2019-01-18 | 中国地质大学（武汉） | A kind of drilling fluid and preparation method thereof for mini pile pore-forming |
-
2020
- 2020-03-18 CN CN202010190421.0A patent/CN111363524A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1126260A (en) * | 1994-05-27 | 1996-07-10 | 金伯特-克拉克公司 | Sulfonated cellulose and method of preparation |
| CN103740342A (en) * | 2014-01-09 | 2014-04-23 | 濮阳市诚信钻采助剂有限公司 | High temperature-resistant and salt-resistant fluid loss additive and preparation method thereof |
| CN104194746A (en) * | 2014-08-27 | 2014-12-10 | 克拉玛依市金鑫科技有限公司 | Biodegradable drilling fluid |
| CN104531102A (en) * | 2015-01-13 | 2015-04-22 | 北京培康佳业技术发展有限公司 | Natural polymer filtrate loss reducer used for drilling fluid and preparation method and application thereof |
| CN106517849A (en) * | 2015-09-10 | 2017-03-22 | 绵阳莫仕科技有限公司 | Oxidation-sulfonation starch water reducing agent preparation method |
| CN106675533A (en) * | 2016-12-23 | 2017-05-17 | 北京奥凯立科技发展股份有限公司 | Grafted starch filtration loss reduction agent used for drilling fluid and preparation method thereof |
| CN109233763A (en) * | 2018-10-26 | 2019-01-18 | 中国地质大学（武汉） | A kind of drilling fluid and preparation method thereof for mini pile pore-forming |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115521383A (en) * | 2022-10-31 | 2022-12-27 | 徐州创力纤维有限公司 | Preparation method of polyanion modified cellulose |
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Application publication date: 20200703 |