CN111100619A - Water absorption retaining agent for sand-carrying workover fluid, application and sand-carrying workover fluid - Google Patents
Water absorption retaining agent for sand-carrying workover fluid, application and sand-carrying workover fluid Download PDFInfo
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- CN111100619A CN111100619A CN201911395463.1A CN201911395463A CN111100619A CN 111100619 A CN111100619 A CN 111100619A CN 201911395463 A CN201911395463 A CN 201911395463A CN 111100619 A CN111100619 A CN 111100619A
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- carrying
- sand
- water absorption
- ethylene diamine
- retaining agent
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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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
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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
- C09K8/032—Inorganic additives
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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
Abstract
The invention relates to a water absorption retaining agent used in the field of oil field underground well workover operation, which comprises disodium ethylene diamine tetraacetate, sodium carbonate and sodium hydroxide, wherein the mass ratio of the disodium ethylene diamine tetraacetate to the sodium carbonate to the sodium hydroxide is 2:2: 1-2: 6: 1; when the water absorption retaining agent is applied to sand carrying of the sand carrying workover fluid, mixing disodium ethylene diamine tetraacetate, sodium carbonate, sodium hydroxide and clear water according to the mass ratio of the clear water to disodium ethylene diamine tetraacetate, the clear water to sodium carbonate and the clear water to sodium hydroxide of 100:2, 100: 2-6 and 100:1 respectively, stirring until the disodium ethylene diamine tetraacetate, the sodium carbonate, the sodium hydroxide and the clear water are completely dissolved, and standing for 6 hours to obtain a water absorption retaining agent solution; the mass ratio of the water absorption retaining agent solution to the polyacrylic resin is as follows: mixing the sand-carrying workover fluid at a ratio of 100: 0.4-100: 1.0. The invention can solve the problems that the water absorption capacity of the sand-carrying workover fluid is sharply reduced along with the increase of the mineralization degree of the fluid, and the carrying capacity is reduced along with the reduction of the water absorption capacity.
Description
Technical Field
The invention belongs to the technical field of chemicals for oil field underground workover treatment, and particularly relates to a water absorption retaining agent for sand-carrying workover fluid, application of the water absorption retaining agent and the sand-carrying workover fluid.
Background
In the well completion stage, the oil-gas well needs sand washing and filling workover operations, namely sand in a shaft is carried to the ground through sand carrying workover fluid; or the sand on the ground is carried to a shaft and a near wellbore area, and engineering accidents such as sand blocking and the like easily occur if clean water is used as well repairing carrying fluid.
The well repairing carrying fluid used in domestic on-site at present comprises guar gum solution, polyacrylamide solution, CMC solution and the like, the sand carrying capacity of the well repairing carrying fluid is 2-4 times of that of clear water, and the technical requirements of sand filling operation construction of large-diameter wells, inclined wells and horizontal wells cannot be met due to low sand carrying capacity.
Therefore, it is important to provide a water absorption retaining agent for a sand-carrying workover fluid, which can solve the problem that the water absorption capacity of the sand-carrying workover fluid is rapidly reduced with the increase of the mineralization of the fluid and the carrying capacity is reduced with the reduction of the water absorption capacity, in view of these problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a water absorption retaining agent for sand-carrying workover fluid, which can solve the problems that the water absorption capacity of the sand-carrying workover fluid is sharply reduced along with the increase of the mineralization degree of the fluid and the carrying capacity is reduced along with the reduction of the water absorption capacity.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a water absorption retaining agent for sand-carrying workover fluid comprises disodium ethylene diamine tetraacetate, sodium carbonate and sodium hydroxide, wherein the mass ratio of the disodium ethylene diamine tetraacetate to the sodium carbonate to the sodium hydroxide is 2:2: 1-2: 6: 1.
When the water absorption retaining agent is applied to sand carrying and workover fluid for sand carrying, disodium ethylene diamine tetraacetate, sodium carbonate, sodium hydroxide and clear water are mixed according to the mass ratio of the clear water to the disodium ethylene diamine tetraacetate, the clear water to the sodium carbonate and the clear water to the sodium hydroxide of 100:2, 100: 2-6 and 100:1 respectively, stirred until the disodium ethylene diamine tetraacetate, the sodium carbonate, the sodium hydroxide and the clear water are completely dissolved, and then kept stand for 6 hours to obtain a water absorption retaining agent solution.
Further, the clean water is water with the mineralization degree lower than 12000 mg/L.
A sand-carrying workover fluid comprises the water absorption retaining agent and polyacrylic resin, wherein the mass ratio of the water absorption retaining agent to the polyacrylic resin is as follows: 100: 0.4-100: 1.0.
The invention has the advantages and positive effects that:
1. the invention effectively solves the problems that the water absorption capacity of the resin used by the novel sand-carrying workover fluid is sharply reduced along with the increase of the mineralization degree of the liquid and the carrying capacity is reduced along with the reduction of the water absorption capacity of the resin, overcomes the influence of the mineralization degree of the base fluid on the water absorption capacity of the resin, and can ensure that the water absorption capacity of the resin in the base fluid with the mineralization degree as high as 30000mg/L is equivalent to the water absorption capacity of the resin in fresh water;
2. the water absorption retaining agent of the invention has the advantages of simple and easily obtained raw materials, low price and simple preparation process.
Detailed Description
First, it should be noted that the specific structures, features, advantages, etc. of the present invention will be specifically described below by way of example, but all the descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any individual technical features described or implicit in the embodiments mentioned herein may still be continued in any combination or subtraction between these technical features (or their equivalents) to obtain still further embodiments of the invention that may not be mentioned directly herein.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
A water absorption retaining agent for sand-carrying workover fluid comprises disodium ethylene diamine tetraacetate, sodium carbonate and sodium hydroxide, wherein the mass ratio of the disodium ethylene diamine tetraacetate to the sodium carbonate to the sodium hydroxide is 2:2: 1-2: 6: 1.
When the water absorption retaining agent is applied to sand carrying and workover fluid for sand carrying, disodium ethylene diamine tetraacetate, sodium carbonate, sodium hydroxide and clear water are mixed according to the mass ratio of the clear water to the disodium ethylene diamine tetraacetate, the clear water to the sodium carbonate and the clear water to the sodium hydroxide of 100:2, 100: 2-6 and 100:1 respectively, stirred until the disodium ethylene diamine tetraacetate, the sodium carbonate, the sodium hydroxide and the clear water are completely dissolved, and then kept stand for 6 hours to obtain a water absorption retaining agent solution.
Further, the clean water is water with the mineralization degree lower than 12000 mg/L.
A sand-carrying workover fluid comprises the water absorption retaining agent solution and polyacrylic resin, wherein the mass ratio of the water absorption retaining agent solution to the polyacrylic resin is as follows: 100: 0.4-100: 1.0.
Example 1
Preparing a water absorption retaining agent, and weighing disodium ethylene diamine tetraacetate, sodium carbonate and sodium hydroxide to ensure that the mass ratio of the disodium ethylene diamine tetraacetate, the sodium carbonate and the sodium hydroxide is 2:2: 1;
the preparation method comprises the following steps: adding water with the mineralization degree lower than 12000mg/L into a stirring tank, sequentially adding disodium ethylenediamine tetraacetate, sodium carbonate and sodium hydroxide into the stirring tank according to the mass ratio of the water to the disodium ethylenediamine tetraacetate, the water to the sodium carbonate and the water to the sodium hydroxide of 100:2, 100:2 and 100:1, stirring until the disodium ethylenediamine tetraacetate, the sodium carbonate and the sodium hydroxide are completely dissolved, and standing for 6 hours to obtain the water absorption retaining agent solution. The mixed liquid is free flowing liquid with a density of 1.005g/cm3～1.020g/cm3And the pH value is more than 10.
Example 2
Preparing a water absorption retaining agent, and weighing disodium ethylene diamine tetraacetate, sodium carbonate and sodium hydroxide to ensure that the mass ratio of the disodium ethylene diamine tetraacetate, the sodium carbonate and the sodium hydroxide is 2:6: 1;
the preparation method comprises the following steps: adding water with the mineralization degree lower than 12000mg/L into a stirring tank, sequentially adding disodium ethylenediamine tetraacetate, sodium carbonate and sodium hydroxide into the stirring tank according to the mass ratio of the water to the disodium ethylenediamine tetraacetate, the water to the sodium carbonate and the water to the sodium hydroxide of 100:2, 100:6 and 100:1, stirring until the disodium ethylenediamine tetraacetate, the sodium carbonate and the sodium hydroxide are completely dissolved, and standing for 6 hours to obtain the water absorption retaining agent solution. The mixed liquid is free flowing liquid with a density of 1.020g/cm3～1.105g/cm3And the pH value is more than 10.
When the water absorption retaining agent prepared in the embodiments 1 and 2 is applied to sand-carrying workover fluid, the carrying capacity of the sand-carrying workover fluid is tested:
example 3
(1) Filling clear water into a transparent glass tube with the length of 600mm, putting 0.7399g stones into the transparent glass tube filled with the clear water, starting a stopwatch when the stones pass through the transparent glass for marking, stopping the stopwatch when the stones pass through the transparent glass for marking, and recording the settling time of the stones with the mass of 0.7399g in fresh water with the length of 500mm as follows: 1.99s, and a reduced settling velocity of 0.2513 m/s.
(2) A transparent glass tube with the length of 600mm is filled with sand-carrying workover fluid prepared by using the water absorption retaining agent solution of the example 1 and polyacrylic resin according to the mass ratio of 100:0.4, one stone with the mass of 0.7399g is put into the transparent glass tube filled with the liquid, a stopwatch is started when the stone passes through a mark on the transparent glass, the stopwatch is stopped when the stone passes through a mark under the transparent glass, and the settlement time of the stone with the mass of 0.7399g when the stone is subjected to the sand-carrying workover fluid prepared by using the water absorption retaining agent and the polyacrylic resin with the length of 500mm is recorded as follows: 20.6s and a reduced settling velocity of 0.024 m/s.
(3) A transparent glass tube with the length of 600mm is filled with sand-carrying workover fluid prepared by using the water absorption retaining agent solution of example 2 and polyacrylic resin according to the mass ratio of 100:1.0, one stone with the mass of 0.7399g is put into the transparent glass tube filled with the liquid, a stopwatch is started when the stone passes through a mark on the transparent glass, the stopwatch is stopped when the stone passes through a mark under the transparent glass, and the settlement time of the stone with the mass of 0.7399g when the stone is subjected to the sand-carrying workover fluid prepared by using the water absorption retaining agent and the polyacrylic resin with the length of 500mm is recorded as follows: 21.1s, reduced settling velocity of 0.0237 m/s.
The sedimentation velocity of the same mass of stones in the sand-carrying workover fluid prepared from the water absorption retaining agent solution and the polyacrylic resin is more than 10 times slower than that in clear water, namely, the sand-carrying capacity of the sand-carrying workover fluid prepared from the water absorption retaining agent and the polyacrylic resin is more than 10 times of that of the clear water.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (4)
1. A water absorption retaining agent for sand-carrying workover fluid is characterized in that: the ethylene diamine tetraacetic acid sodium salt comprises disodium ethylene diamine tetraacetate, sodium carbonate and sodium hydroxide, wherein the mass ratio of the disodium ethylene diamine tetraacetate to the sodium carbonate to the sodium hydroxide is 2:2: 1-2: 6: 1.
2. The application of the water absorption and retention agent for the sand-carrying workover fluid according to claim 1 is characterized in that: when the water absorption retaining agent is applied to sand carrying of the sand carrying workover fluid, disodium ethylene diamine tetraacetate, sodium carbonate, sodium hydroxide and clear water are mixed according to the mass ratio of the clear water to the disodium ethylene diamine tetraacetate, the clear water to the sodium carbonate and the clear water to the sodium hydroxide of 100:2, 100: 2-6 and 100:1 respectively, stirred until the disodium ethylene diamine tetraacetate, the sodium carbonate, the sodium hydroxide and the clear water are completely dissolved, and then kept stand for 6 hours to obtain a water absorption retaining agent solution.
3. The application of the water absorption and retention agent for the sand-carrying workover fluid according to claim 2 is characterized in that: the clear water is water with the mineralization degree lower than 12000 mg/L.
4. A sand-carrying workover fluid is characterized in that: the water absorption retention agent solution and the polyacrylic resin according to claim 2, wherein the mass ratio of the water absorption retention agent solution to the polyacrylic resin is as follows: 100: 0.4-100: 1.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911395463.1A CN111100619B (en) | 2019-12-30 | 2019-12-30 | Sand-carrying workover fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911395463.1A CN111100619B (en) | 2019-12-30 | 2019-12-30 | Sand-carrying workover fluid |
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| CN111100619A true CN111100619A (en) | 2020-05-05 |
| CN111100619B CN111100619B (en) | 2021-12-24 |
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| CN201911395463.1A Active CN111100619B (en) | 2019-12-30 | 2019-12-30 | Sand-carrying workover fluid |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006028578A1 (en) * | 2004-07-20 | 2006-03-16 | Hercules Incorporated | Use of polyethylene glycol based fluidized polymer suspension in functional systems |
| CN104789200A (en) * | 2015-04-09 | 2015-07-22 | 中国石油集团渤海钻探工程有限公司 | Blockage removal agent for barite pollution of oil-gas well |
| US9611416B2 (en) * | 2010-10-25 | 2017-04-04 | Isp Investments Llc | Salt-tolerant, thermally-stable rheology modifiers |
-
2019
- 2019-12-30 CN CN201911395463.1A patent/CN111100619B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006028578A1 (en) * | 2004-07-20 | 2006-03-16 | Hercules Incorporated | Use of polyethylene glycol based fluidized polymer suspension in functional systems |
| US9611416B2 (en) * | 2010-10-25 | 2017-04-04 | Isp Investments Llc | Salt-tolerant, thermally-stable rheology modifiers |
| CN104789200A (en) * | 2015-04-09 | 2015-07-22 | 中国石油集团渤海钻探工程有限公司 | Blockage removal agent for barite pollution of oil-gas well |
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| CN111100619B (en) | 2021-12-24 |
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Effective date of registration: 20211108 Address after: 300457 Tianjin Binhai New Area Development Zone Second Avenue 83, China Petroleum Tianjin building Bohai Drilling Engineering Co., Ltd. Applicant after: CNPC Bohai Drilling Engineering Co.,Ltd. Applicant after: CHINA NATIONAL PETROLEUM Corp. Address before: 300457 Tianjin Binhai New Area Development Zone Second Avenue 83, China Petroleum Tianjin building Bohai Drilling Engineering Co., Ltd. Applicant before: CNPC Bohai Drilling Engineering Co.,Ltd. |
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