CN111732942B - Temperature-sensitive gel plugging slurry - Google Patents
Temperature-sensitive gel plugging slurry Download PDFInfo
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- CN111732942B CN111732942B CN202010467333.0A CN202010467333A CN111732942B CN 111732942 B CN111732942 B CN 111732942B CN 202010467333 A CN202010467333 A CN 202010467333A CN 111732942 B CN111732942 B CN 111732942B
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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
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/28—Polysaccharides or derivatives thereof
- C04B26/285—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
- C09K8/42—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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- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses temperature-sensitive gel plugging slurry, which comprises 5-10% of a temperature-sensitive gel plugging agent, 2-5% of a rigid plugging material, 1-2% of a fiber plugging material and 1-2% of a layered plugging material, wherein the contents of the components are calculated by the mass of water; wherein the temperature-sensitive gel plugging agent is prepared by mixing 40-50% of curdlan, 40-50% of bentonite for drilling fluid, 1-2% of soda ash and 5-15% of adhesion promoter in percentage by mass; the temperature-sensitive gel leakage-blocking slurry is in a gel state at high temperature, and has larger viscous resistance and stronger bearing capacity in a leakage layer; compared with the conventional leakage stoppage slurry, the gel state formation of the temperature-sensitive gel leakage stoppage slurry is only related to the temperature, the gelling effect of the temperature-sensitive gel leakage stoppage slurry is not influenced by other leakage stoppage materials, and the existence of the fiber leakage stoppage materials and the like can also enable the colloid structure force to be stronger.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas, in particular to temperature-sensitive gel leakage-stopping slurry.
Background
The well leakage is a worldwide problem, accounts for about 60% of the complexity of the current drilling accidents, particularly the vicious leakage of fractured strata not only loses the drilling time, but also easily causes engineering accidents such as well collapse, drill sticking and the like, and can cause out-of-control well blowout. The existing crosslinking type plugging gel mainly comprises crosslinking gels such as polyacrylamide, vegetable gum, polyvinyl alcohol and the like, but the existing crosslinking type gels all need to be added with a crosslinking agent, so that the risks of short crosslinking time and uncontrollable time of partial gels exist.
As a novel plugging technology, gel plugging is insufficient in strength at high temperature and poor in pressure bearing capacity, is easy to polymerize in advance in the conveying process to influence plugging construction, cannot be matched with a conventional plugging agent for use, and is greatly limited to be applied on site. The curdlan is used as a natural polysaccharide plant, has a thermal gelation property, does not need to be added with a cross-linking agent, effectively avoids the risk of sudden aggregation, but the single curdlan cannot form solid gel in a high-temperature state, and the curdlan is not dissolved in cold water, so that the solution has no viscosity effect, cannot bear various weighting materials, and cannot realize the purpose of pressure-bearing and leakage-stopping of the stratum.
Disclosure of Invention
The invention aims to provide temperature-sensitive gel leakage-stopping slurry with high colloid strength and leakage-stopping effect.
Therefore, the technical scheme of the invention is as follows:
a temperature-sensitive gel leakage blocking slurry comprises 5-10% of a temperature-sensitive gel leakage blocking agent, 2-5% of a rigid leakage blocking material, 1-2% of a fiber leakage blocking material and 1-2% of a layered leakage blocking material, wherein the contents of the components are calculated by the mass of water; the temperature-sensitive gel plugging agent is prepared by mixing 40-50% of curdlan, 40-50% of bentonite for drilling fluid, 1-2% of soda ash and 5-15% of a viscosity enhancer in percentage by mass, and the sum of the percentage by mass of the components is 100%.
In the temperature-sensitive gel leakage-stopping slurry, the main components of the temperature-sensitive gel leakage-stopping agent are curdlan and bentonite for drilling fluid, wherein the curdlan has a structure similar to that of glucose, the surface of the curdlan is provided with a plurality of exposed hydroxyl groups, the main component of the bentonite for drilling fluid is montmorillonite which is aluminosilicate, the surface of the montmorillonite is provided with a plurality of exposed aluminum and has good water absorption, when the temperature-sensitive gel leakage-stopping agent is used for leakage-stopping operation, the curdlan and the bentonite for drilling fluid are added into water, and the exposed hydroxyl groups on the surface of the curdlan and the vacant potential phases of the exposed aluminum on the surface of the bentonite for drilling fluid interact to form hydrogen bonds under a certain temperature condition, so that solid gel can be formed under a high-temperature condition, free water is completely fixed, and the purpose of bearing and leakage stopping is achieved; meanwhile, the strength of the temperature-sensitive gel plugging agent is further increased by adding a certain proportion of soda, carboxymethyl starch and/or polyanionic cellulose; on the basis of the temperature-sensitive gel plugging agent, the rigid plugging material, the fiber plugging material and the layered plugging material are further added, so that the plugging slurry has high colloid strength and excellent plugging effect compared with the conventional plugging slurry.
Preferably, the viscosity enhancer is at least one of carboxymethyl starch and polyanionic cellulose.
Preferably, the rigid plugging material is at least one of fruit shell, calcite and limestone, and the particle size of the rigid plugging material is 0.3-4 mm.
Preferably, the shell is at least one of walnut shell and apricot shell.
Preferably, the fiber plugging material is at least one of polypropylene fiber and bagasse, and the particle size of the fiber plugging material is 2-10 mm.
Preferably, the layered plugging material is at least one of mica sheets and shell sheets, and the particle size of the layered plugging material is 0.15-4 mm.
The preparation method of the temperature-sensitive gel leakage-stopping slurry is simple and comprises the following steps: adding the components forming the temperature-sensitive gel plugging agent into water according to a certain proportion, stirring at a high speed for 20min, standing and maintaining for 4h at room temperature; then adding a rigid plugging material, a fiber plugging material and a layered plugging material into the mixture in proportion, and continuously stirring the mixture at a high speed for 20min to obtain a temperature-sensitive gel plugging slurry finished product.
Compared with the prior art, the temperature-sensitive gel leakage-blocking slurry has the following beneficial effects:
1) compared with the conventional leakage blocking slurry, the temperature-sensitive gel leakage blocking slurry disclosed by the application is in a gel state at high temperature, and has larger viscous resistance and stronger bearing capacity in a leakage layer;
2) compared with the conventional plugging slurry, the gel state of the temperature-sensitive gel plugging slurry is only related to the temperature, the gelling effect of the gel is not influenced by other plugging materials, and the existence of the plugging materials such as fibers can also enable the colloid structure force to be stronger.
Drawings
FIG. 1 is a schematic diagram of temperature-sensitive gel plugging slurry of example 1 forming a solid gel after being heated to 80 ℃ in test one;
FIG. 2 is a schematic diagram of temperature-sensitive gel plugging slurry of example 2 that forms a solid gel after being heated to 80 ℃ in test one;
FIG. 3 is a schematic diagram of temperature-sensitive gel plugging slurry of example 3 forming solid gel after being heated to 80 ℃ in test one;
fig. 4 is a schematic diagram of temperature-sensitive gel plugging slurry of comparative example 1 which forms solid gel after being heated to 80 ℃ in test one.
Detailed Description
The invention will be further described with reference to the following drawings and specific examples, which are not intended to limit the invention in any way. In the following examples and comparative examples, each component was purchased from a commercially available product.
Example 1
A temperature-sensitive gel plugging slurry is formed by mixing 100 parts by weight of clear water, 5 parts by weight of a temperature-sensitive gel plugging agent, 2 parts by weight of a rigid plugging material, 1 part by weight of a fiber plugging material and 1 part by weight of a layered plugging material; wherein the temperature-sensitive gel plugging agent is prepared by mixing 43.5 parts by weight of curdlan, 40 parts by weight of bentonite for drilling fluid, 1.5 parts by weight of soda ash and 15 parts by weight of carboxymethyl starch; the rigid plugging material adopts walnut shells with the grain size range of 1.18 mm-4.00 mm; the fiber plugging material adopts polypropylene fiber with the length range of 5 mm-8 mm; the layered leak-stopping material adopts mica sheets with the particle size range of 0.425 mm-2.00 mm.
The preparation method of the temperature-sensitive gel leakage-stopping slurry comprises the following steps: adding the components forming the temperature-sensitive gel plugging agent into water according to a certain proportion, stirring at a high speed of 3000r/min for 20min, standing and maintaining at room temperature for 4 h; then adding a rigid plugging material, a fiber plugging material and a layered plugging material into the mixture in proportion, and continuously stirring the mixture at a high speed of 3000r/min for 20min to obtain a temperature-sensitive gel plugging slurry finished product.
Example 2
A temperature-sensitive gel leakage-stopping slurry is formed by mixing 100 parts by weight of clear water, 10 parts by weight of a temperature-sensitive gel leakage-stopping agent, 5 parts by weight of a rigid leakage-stopping material, 2 parts by weight of a fiber leakage-stopping material and 2 parts by weight of a layered leakage-stopping material; wherein the temperature-sensitive gel plugging agent is prepared by mixing 40 parts by weight of curdlan, 50 parts by weight of bentonite for drilling fluid, 1 part by weight of soda ash and 9 parts by weight of polyanionic cellulose; the rigid plugging material adopts calcite with the grain size range of 0.60 mm-2.00 mm; the fiber type plugging material adopts bagasse with the length range of 2 mm-4 mm; the layered plugging material adopts shell pieces with the grain size range of 0.15 mm-0.425 mm.
The preparation method of the temperature-sensitive gel leakage-stopping slurry comprises the following steps: adding the components forming the temperature-sensitive gel plugging agent into water according to a certain proportion, stirring at a high speed of 3000r/min for 20min, standing and maintaining at room temperature for 4 h; then adding a rigid plugging material, a fiber plugging material and a layered plugging material into the mixture in proportion, and continuously stirring the mixture at a high speed of 3000r/min for 20min to obtain a temperature-sensitive gel plugging slurry finished product.
Example 3
A temperature-sensitive gel leakage-stopping slurry is prepared by mixing 100 parts by weight of clear water, 8 parts by weight of a temperature-sensitive gel leakage-stopping agent, 3 parts by weight of a rigid leakage-stopping material, 1.5 parts by weight of a fiber leakage-stopping material and 1.2 parts by weight of a layered leakage-stopping material; wherein the temperature-sensitive gel plugging agent is prepared by mixing 50 parts by weight of curdlan, 43 parts by weight of bentonite for drilling fluid, 2 parts by weight of soda ash and 5 parts by weight of polyanionic cellulose; the rigid plugging material adopts limestone with the grain size range of 0.30 mm-0.60 mm; the fiber type plugging material adopts polypropylene fiber layered plugging material with the length range of 6 mm-10 mm and mica sheets with the particle size range of 2 mm-4 mm.
The preparation method of the temperature-sensitive gel leakage-stopping slurry comprises the following steps: adding the components forming the temperature-sensitive gel plugging agent into water according to a certain proportion, stirring at a high speed of 3000r/min for 20min, standing and maintaining at room temperature for 4 h; then adding the rigid plugging material, the fiber plugging material and the layered plugging material into the mixture in proportion, and continuously stirring the mixture at a high speed of 3000r/min for 20min to obtain a temperature-sensitive gel plugging slurry finished product.
Comparative example 1
A temperature-sensitive gel plugging slurry is prepared by mixing 100 parts by weight of clear water and 5 parts by weight of a temperature-sensitive gel plugging agent; wherein, the temperature-sensitive gel plugging agent is prepared by mixing 43.5 parts by weight of curdlan, 40 parts by weight of bentonite for drilling fluid, 1.5 parts by weight of soda ash and 15 parts by weight of carboxymethyl starch.
The preparation method of the temperature-sensitive gel leakage-stopping slurry comprises the following steps: the components forming the temperature-sensitive gel plugging agent are added into water according to a certain proportion, stirred at a high speed of 3000r/min for 20min, and kept stand at room temperature for 4h to obtain a finished product of the temperature-sensitive gel plugging slurry.
And (3) performance testing:
testing one:
400mL of the temperature-sensitive gel plugging slurry prepared in the example 1, the example 2, the example 3 and the comparative example 1 are respectively taken, rolled for 1h in a high-temperature aging tank at a preset temperature, taken out and observed.
The test results are shown in table 1 below.
Table 1:
as can be seen from the test results in Table 1, examples 1-3 and comparative example 1 all formed solid gels at elevated temperatures up to 80 ℃.
And (2) testing:
taking 300mL of the temperature-sensitive gel plugging slurry finished products prepared in the examples 1, 2, 3 and 1, respectively pouring the finished products into different high-temperature high-pressure fluid loss filter cup bodies (without adding filter paper), and enabling the slurry to be directly communicated with the lower valve rod; and (3) heating the cup body of the high-temperature high-pressure filtration loss instrument to 120 ℃, keeping the temperature for 1h, opening the upper valve rod and the lower valve rod, starting pressurization from the upper valve rod, and observing the pulp discharge state of the valve rods under different pressure conditions.
The test results are shown in table 2 below.
Table 2:
| test example | Pressure of | Discharge state of slurry |
| Example 1 | 3MPa | Discharge of slurry |
| Example 2 | 3MPa | Discharge without slurry |
| Example 3 | 3MPa | Discharge of slurry |
| Comparative example 1 | 1.5MPa | Solid slurry discharge |
From the test results in the table 2, it can be seen that the temperature-sensitive gel leakage-blocking slurry prepared in the embodiments 1 to 3 can form stable solid gel at high temperature and high pressure, and has good pressure-bearing capacity; while comparative example 1 can form a solid gel even at high temperature, the spatial network structure force is poor, and the pressure bearing capacity is poor.
Claims (6)
1. The temperature-sensitive gel leakage blocking slurry is characterized by comprising 5-10% of a temperature-sensitive gel leakage blocking agent, 2-5% of a rigid leakage blocking material, 1-2% of a fiber leakage blocking material and 1-2% of a layered leakage blocking material, wherein the contents of the components are calculated by the mass of water; the temperature-sensitive gel plugging agent is prepared by mixing 40-50% of curdlan, 40-50% of bentonite for drilling fluid, 1-2% of soda ash and 5-15% of a viscosity enhancer in percentage by mass, and the sum of the percentage by mass of the components is 100%.
2. The temperature-sensitive gel leakage blocking paste according to claim 1, wherein the viscosity enhancer is at least one of carboxymethyl starch and polyanionic cellulose.
3. The temperature-sensitive gel leakage-stopping slurry according to claim 1, wherein the rigid leakage-stopping material is at least one of nut shell, calcite and limestone, and the particle size of the rigid leakage-stopping material is 0.3-4 mm.
4. The temperature-sensitive gel leakage blocking paste according to claim 3, wherein the shell is at least one of walnut shell and apricot shell.
5. The temperature-sensitive gel leaking stoppage slurry according to claim 1, wherein the fiber leaking stoppage material is at least one of polypropylene fiber and bagasse, and the particle size of the fiber leaking stoppage material is 2mm to 10 mm.
6. The temperature-sensitive gel leakage-stopping slurry according to claim 1, wherein the layered leakage-stopping material is at least one of mica sheets and shell sheets, and the particle size of the layered leakage-stopping material is 0.15 mm-4 mm.
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| CN112195017A (en) * | 2020-10-10 | 2021-01-08 | 蒙吉光 | Plugging agent, preparation method and application thereof in well drilling plugging |
| CN116063993B (en) * | 2021-12-29 | 2024-02-09 | 中国石油天然气集团有限公司 | Compound anti-Wen Dulou slurry and preparation method and application thereof |
| CN114574181A (en) * | 2022-03-15 | 2022-06-03 | 陕西山秦能源技术服务有限公司 | Gel tissue plugging material and preparation method thereof |
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| CN102627956A (en) * | 2012-03-08 | 2012-08-08 | 山东中科生物科技股份有限公司 | Application of curdlan as profile control agent in petroleum exploitation and application method |
| CN102965085A (en) * | 2012-12-07 | 2013-03-13 | 何洪城 | Gelatine drilling fluid additive and preparation method thereof |
| CN104563952A (en) * | 2015-01-19 | 2015-04-29 | 中国石油集团渤海钻探工程有限公司 | Non-crosslinking special gel leakage stopping method |
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