CN105238372A - High-molecular gel plugging agent and preparation method thereof - Google Patents
High-molecular gel plugging agent and preparation method thereof Download PDFInfo
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- CN105238372A CN105238372A CN201510553147.8A CN201510553147A CN105238372A CN 105238372 A CN105238372 A CN 105238372A CN 201510553147 A CN201510553147 A CN 201510553147A CN 105238372 A CN105238372 A CN 105238372A
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- plugging agent
- molecular gel
- gel plugging
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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- Processes Of Treating Macromolecular Substances (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a high-molecular gel plugging agent and a preparation method thereof. The high-molecular gel plugging agent is prepared from following substances through a reaction, by weight: 40-85% of sodium polyacrylate, 9-50% of chitosan, 3-20% of an initiator and 1-10% of a crosslinking agent. The preparation method includes the following steps: 1) mixing and grinding the sodium polyacrylate and the crosslinking agent into a powder; 2) dissolving the chitosan in an acetic acid solution and adding the initiator to carry out a reaction, and adding the powder; 3) performing temperature-constant heating at 40-80 DEG C, and performing a reaction under the pH of 11-13, and finally drying and crushing a gel substance to obtain the high-molecular gel plugging agent. The high-molecular gel plugging agent is high in water-absorbing expansive rate, is strong in retention capability and is high in water retention rate and can effectively satisfy plugging demands of large pores, natural cracks and karst cave loss. The plugging agent is simple in preparation method and is easy to produce.
Description
Technical field
The present invention relates to cementing technology field, particularly relate to a kind of high-molecular gel plugging agent and preparation method thereof.
Background technology
In oil/gas drilling process, when boring chance stress discern stratum, fragmentation or weak solid formation, fracture development stratum and overlap pressure series of strata stratum more, very easily there is circulation problems.Leakage not only can extend drilling period, increase drilling fluid cost, also likely causes a series of down-holes faults such as bit freezing, blowout, borehole well instability, causes tremendous economic to lose.
Plugging agent shutoff is a kind of remedial measures for crack in oil production, at present main application bridge joint patching materials shutoff weak zone.Practice shows, there is limitation in conventional pons hematoma material: one is that self deformability of this kind of patching materials is poor or do not possess deformability in Process of Leaking Stoppage in process Fractured, hole severe mud losses, if patching materials is a bit larger tham drop ply hole flaw size or does not mate with the shape in drop ply hole crack, just not easily enter into drop ply, but formation accumulation does not go deep into drop ply on drop ply surface; Two is that this kind of patching materials does not have water swellability or only has small water-swelling amount, is not easily stably trapped in the middle of drop ply under the effect of applied external force.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of high-molecular gel plugging agent and preparation method thereof, this high-molecular gel plugging agent has the advantages that expansion rate of water absorption is high, retentivity is strong and water retention is high, effectively can meet the leak stopping demand of macropore, natural fracture and solution cavity leakage.And its preparation method is simple, be easy to realize.
For this reason, technical scheme of the present invention is as follows:
A kind of high-molecular gel plugging agent, by obtained after following substance reaction:
Preferably, the molecular weight of described sodium polyacrylate is 500 ~ 15000.
Preferably, the N-deacetylation of described chitosan is 50% ~ 100%.
Preferably, described initiator be in ammonium sulfate, Potassium Persulphate and S-WAT any one or arbitrarily several with arbitrarily than mixture.
Preferably, described linking agent is N, N '-methylene-bisacrylamide.
The preparation method of high-molecular gel plugging agent described above, comprises the steps:
1) by sodium polyacrylate and linking agent mixed grinding to powder;
2) under 40 ~ 80 DEG C of conditions, chitosan is dissolved in acetic acid solution, wherein the concentration of chitosan is 0.5 ~ 5wt.%, adds initiator for reaction 20min ~ 40min, then slowly adds the mixed powder of sodium polyacrylate and linking agent;
3) thermostatically heating under 40 ~ 80 DEG C of conditions, is adjusted to 11 ~ 13 with the aqueous sodium hydroxide solution that concentration is 7 ~ 10wt.% by pH value, fully reacts, take out wherein gelatinous mass, dry, pulverize, and obtains described high-molecular gel plugging agent.
Step 3) described in drying conditions be 40 DEG C ~ 60 DEG C freeze-day with constant temperature.
Compared with existing plugging agent, beneficial effect of the present invention is: 1) resistance to erosion ability is strong, resident effective; 2) described plugging agent has certain water-swelling amount after meeting water, and can form the elastogel with higher-strength; 3) compatibleness is good, has synergistic function with inertia plugging agent.
Embodiment
Below in conjunction with embodiment, technical scheme of the present invention is described in detail.
Embodiment 1
A kind of high-molecular gel plugging agent, is obtained by following substance reaction: by weight, sodium polyacrylate (PAAS) 30 parts, chitosan (CTS) 5 parts, initiator potassium persulfate 2 parts, linking agent N, N '-methylene-bisacrylamide (NMBA) 1 part.
Preparation method: water bath with thermostatic control 60 DEG C, 0.45g chitosan (CTS) is fully dissolved in the acetic acid solution of 50ml, 1.5wt.%, add 0.18g initiator potassium persulfate to cause, wait for 30min, add the mixed powder of raw material PAAS2.7g and linking agent NMBA0.09g, 60 DEG C of thermostatically heating, be 13 by the sodium hydroxide solution adjust ph that concentration is 8wt.%, take out after abundant reaction, dry at a conventional oven 50 DEG C, pulverize the macromolecule water uptake gel obtaining certain granules size, be described high-molecular gel plugging agent.Wherein NMBA is N ' N '-methylene-bisacrylamide.
During use, in plugging drilling fluid, add the high-molecular gel plugging agent of the present invention of plugging drilling fluid total amount 10wt.%.
Adopt 5mm simulation fracture to do pressure-bearing experiment, the pressure-bearing time is 30min, and simulated formation temperature is 60 DEG C, and the bearing capacity of the high-molecular gel plugging agent that this embodiment obtains is: 5mm aperture plate bearing capacity reaches 4Mpa.Normal temperature water-swelling multiplying power is 141g/g, and 80 DEG C of water-swelling multiplying powers are 152g/g, and under normal temperature, the water retention of 2 weeks is the water retention of at 61%, 80 DEG C 2 weeks is 40%, and the water-intake rate in the NaCl solution of 1wt.% is 50g/g.
Embodiment 2
High-molecular gel plugging agent of the present invention, obtained by following substance reaction: by weight, sodium polyacrylate (PAAS) 32 parts, chitosan (CTS) 4 parts, initiator potassium persulfate 2 parts, linking agent (NMBA) N ' N '-methylene-bisacrylamide 0.5 part.
Preparation method: water bath with thermostatic control 60 DEG C, 0.44g chitosan (CTS) is fully dissolved in the acetic acid solution of 50ml, 1.5wt.%, add 0.22g initiator potassium persulfate to cause, wait for 30min, add the mixed powder of raw material PAAS3.52g and linking agent NMBA0.055g, 60 DEG C of thermostatically heating, be 13 by the sodium hydroxide solution adjust ph that concentration is 8wt.%, take out after abundant reaction, dry at a conventional oven 50 DEG C, pulverize the macromolecule water uptake gel obtaining certain granules size, be described high-molecular gel plugging agent.Wherein NMBA is N ' N '-methylene-bisacrylamide.
During use, in plugging drilling fluid, add the high-molecular gel plugging agent of the present invention of plugging drilling fluid total amount 8wt.%.
Adopt 5mm simulation fracture to do pressure-bearing experiment, the pressure-bearing time is 30min, and simulated formation temperature is 60 DEG C, and the bearing capacity of the high-molecular gel plugging agent that this embodiment obtains is: 5mm aperture plate bearing capacity reaches 4.3Mpa.Normal temperature water-swelling multiplying power is 176g/g, and 80 DEG C of water-swelling multiplying powers are 183g/g, and under normal temperature, the water retention of 2 weeks is the water retention of at 65%, 80 DEG C 2 weeks is 48%, and the water-intake rate in the NaCl solution of 1wt.% is 62g/g.
Embodiment 3
High-molecular gel plugging agent of the present invention, obtained by following substance reaction: by weight, sodium polyacrylate (PAAS) 36 parts, chitosan (CTS) 4 parts, initiator potassium persulfate 2 parts, linking agent (NMBA) N ' N '-methylene-bisacrylamide 1.5 parts.
Preparation method: water bath with thermostatic control 60 DEG C, 0.44g chitosan (CTS) is fully dissolved in the acetic acid solution of 50ml, 1.5wt.%, add 0.22g initiator potassium persulfate to cause, wait for 30min, add the mixed powder of raw material PAAS3.96g and linking agent NMBA0.165g, 60 DEG C of thermostatically heating, be 13 by the sodium hydroxide solution adjust ph that concentration is 8wt.%, take out after abundant reaction, dry at a conventional oven 50 DEG C, pulverize the macromolecule water uptake gel obtaining certain granules size, be described high-molecular gel plugging agent.Wherein NMBA is N ' N '-methylene-bisacrylamide.
During use, in plugging drilling fluid, add the high-molecular gel plugging agent of the present invention of plugging drilling fluid total amount 6wt.%, and the inert material glass fibre adding 0.06% is to increase pressure-bearing property.
Adopt 5mm simulation fracture to do pressure-bearing experiment, the pressure-bearing time is 30min, and simulated formation temperature is 60 DEG C, and the bearing capacity of the high-molecular gel plugging agent that this embodiment obtains is: 5mm aperture plate bearing capacity reaches 5.1Mpa.Normal temperature water-swelling multiplying power is 162g/g, and 80 DEG C of water-swelling multiplying powers are 170g/g, and under normal temperature, the water retention of 2 weeks is the water retention of at 68%, 80 DEG C 2 weeks is 45%, and the water-intake rate in the NaCl solution of 1wt.% is 58g/g.
Embodiment 4
High-molecular gel plugging agent of the present invention, obtained by following substance reaction: by weight, sodium polyacrylate (PAAS) 32 parts, chitosan (CTS) 4 parts, initiator potassium persulfate 1.5 parts, linking agent (NMBA) N, N '-methylene-bisacrylamide 1 part;
Preparation method: water bath with thermostatic control 60 DEG C, 0.44g chitosan (CTS) is fully dissolved in the acetic acid solution of 50ml, 1.5wt.%, add 0.165g initiator potassium persulfate to cause, wait for 30min, add the mixed powder of raw material PAAS3.52g and linking agent NMBA0.11g, 60 DEG C of thermostatically heating, be 13 by the sodium hydroxide solution adjust ph that concentration is 8wt.%, take out after abundant reaction, dry at a conventional oven 50 DEG C, pulverize the macromolecule water uptake gel obtaining certain granules size, be described high-molecular gel plugging agent.Wherein NMBA is N ' N '-methylene-bisacrylamide.
During use, in plugging drilling fluid, add the high-molecular gel plugging agent of the present invention of plugging drilling fluid total amount 12wt.%.
Adopt 5mm simulation fracture to do pressure-bearing experiment, the pressure-bearing time is 30min, and simulated formation temperature is 60 DEG C, and the bearing capacity of the high-molecular gel plugging agent that this embodiment obtains is: 5mm aperture plate bearing capacity reaches 4.5Mpa.Normal temperature water-swelling multiplying power is 153g/g, and 80 DEG C of water-swelling multiplying powers are 165g/g, and under normal temperature, the water retention of 2 weeks is the water retention of at 63%, 80 DEG C 2 weeks is 42%, and the water-intake rate in the NaCl solution of 1wt.% is 55g/g.
The foregoing is only preferred embodiment of the present invention, be not limited to the present invention, all any amendments of making within principle of the present invention and equivalently to replace, all should protection scope of the present invention be belonged to.
Claims (7)
1. a high-molecular gel plugging agent, is characterized in that by obtained after following substance reaction:
2. high-molecular gel plugging agent as claimed in claim 1, is characterized in that: the molecular weight of described sodium polyacrylate is 500 ~ 15000.
3. high-molecular gel plugging agent as claimed in claim 1, is characterized in that: the N-deacetylation of described chitosan is 50% ~ 100%.
4. high-molecular gel plugging agent as claimed in claim 1, is characterized in that: described initiator be in ammonium sulfate, Potassium Persulphate and S-WAT any one or arbitrarily several with arbitrarily than mixture.
5. high-molecular gel plugging agent as claimed in claim 1, is characterized in that: described linking agent is N, N '-methylene-bisacrylamide.
6., as the preparation method of high-molecular gel plugging agent as described in any one in Claims 1 to 5, it is characterized in that comprising the steps:
1) by sodium polyacrylate and linking agent mixed grinding to powder;
2) under 40 ~ 80 DEG C of conditions, chitosan is dissolved in acetic acid solution, wherein the concentration of chitosan is 0.5 ~ 5wt.%, adds initiator for reaction 20min ~ 40min, then slowly adds the mixed powder of sodium polyacrylate and linking agent;
3) thermostatically heating under 40 ~ 80 DEG C of conditions, is adjusted to 11 ~ 13 with the aqueous sodium hydroxide solution that concentration is 7 ~ 10wt.% by pH value, fully reacts, take out wherein gelatinous mass, dry, pulverize, and obtains described high-molecular gel plugging agent.
7. preparation method as claimed in claim 6, is characterized in that: step 3) described in drying conditions be 40 DEG C ~ 60 DEG C freeze-day with constant temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510553147.8A CN105238372A (en) | 2015-09-02 | 2015-09-02 | High-molecular gel plugging agent and preparation method thereof |
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| CN201510553147.8A CN105238372A (en) | 2015-09-02 | 2015-09-02 | High-molecular gel plugging agent and preparation method thereof |
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| CN105238372A true CN105238372A (en) | 2016-01-13 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108048061A (en) * | 2017-12-04 | 2018-05-18 | 杨帮燕 | A kind of preparation method of diverting agent |
| CN109628078A (en) * | 2018-10-29 | 2019-04-16 | 郭跃 | A kind of preparation method of high deformation type absorbent resin plugging agent material |
| CN110088225A (en) * | 2016-12-20 | 2019-08-02 | 沙特阿拉伯石油公司 | For leaking the plugging material of control to middle leakage control |
| CN111019617A (en) * | 2019-12-17 | 2020-04-17 | 吴浩 | Polymer gel composite plugging agent and preparation method thereof |
| CN114054301A (en) * | 2021-12-27 | 2022-02-18 | 南通世睿电力科技有限公司 | Construction process of acrylic acid adhesive for plugging power equipment under low-temperature condition |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110088225A (en) * | 2016-12-20 | 2019-08-02 | 沙特阿拉伯石油公司 | For leaking the plugging material of control to middle leakage control |
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| CN109628078A (en) * | 2018-10-29 | 2019-04-16 | 郭跃 | A kind of preparation method of high deformation type absorbent resin plugging agent material |
| CN111019617A (en) * | 2019-12-17 | 2020-04-17 | 吴浩 | Polymer gel composite plugging agent and preparation method thereof |
| CN111019617B (en) * | 2019-12-17 | 2021-02-23 | 徐倩倩 | Polymer gel composite plugging agent and preparation method thereof |
| CN114054301A (en) * | 2021-12-27 | 2022-02-18 | 南通世睿电力科技有限公司 | Construction process of acrylic acid adhesive for plugging power equipment under low-temperature condition |
| CN114054301B (en) * | 2021-12-27 | 2022-06-24 | 南通世睿电力科技有限公司 | Construction process of acrylic acid adhesive for plugging of power equipment under low-temperature condition |
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