CN106995686B - Controllable gelling plugging agent - Google Patents
Controllable gelling plugging agent Download PDFInfo
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- CN106995686B CN106995686B CN201610048849.5A CN201610048849A CN106995686B CN 106995686 B CN106995686 B CN 106995686B CN 201610048849 A CN201610048849 A CN 201610048849A CN 106995686 B CN106995686 B CN 106995686B
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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Abstract
The invention provides a controllable gelling plugging agent, which is prepared from materials including a gel material, a thixotropic coagulation regulator, polypropylene fibers, a polyacrylamide stabilizer, a cementing agent and a water repellent; the gel material is prepared from sulphoaluminate cement and sodium dodecyl sulfate; the thixotropic coagulation regulator is prepared from water, acrylamide, organic chromium salt, an initiator and a crosslinking agent. The controllable gelling plugging agent provided by the invention adopts an aluminum sulfate gel material with sulfonic groups and an organic chromium thixotropic coagulation regulator, and is matched with polypropylene fibers, a polyacrylamide stabilizer, a cementing agent and a water repellent, so that the plugging agent has better thixotropic property, water immersion resistance, plugging strength and retention capacity. The controllable gelling plugging agent provided by the invention has the advantages of adaptation temperature of 30-80 ℃, adjustable setting time and fast development of solid strength.
Description
Technical Field
The invention relates to the technical field of drilling fluid treating agents, in particular to a controllable gelling plugging agent.
Background
Along with the development of shale gas in China, drilling is subject to large cracks, karst cave complex leakage strata are more and more, particularly, sea phase shale gas is developed in large scale in areas such as Chongqing Fuling reef dam, Yibin and the like, karst cave and crack vicious leakage often occur from the surface layer of drilling to the completion of drilling in the drilling process of the areas, drilling liquid can not enter during drilling construction, the drilling liquid leakage amount is generally thousands of times, and serious people cause huge economic loss in ten thousands of times, so that the drilling liquid leakage becomes one of the difficult problems of drilling.
At present, technologies for treating large-crack and karst-cave type leakage mainly comprise a bridge plug leakage-stopping slurry technology, a cement leakage-stopping slurry technology, a clear water forced drilling measure and a gel leakage-stopping technology. Because the leakage channel is large, the difficulty of realizing high-strength plugging close to a bridge plug and a cement material is high; the water-jet drilling requires better address and engineering conditions, and is generally difficult to achieve. The Chinese patent with the application number of 201410601864.9 discloses a preparation method of a plugging agent for drilling fluid, which comprises the following steps: (1) adding distilled water into a solvent to dissolve an organic monomer, adjusting the pH value to 8-9, adding a dispersing agent, and uniformly stirring to form a dispersed phase; adding the dispersion phase into white oil, emulsifying for 20-30 min, raising the temperature to 40-50 ℃, introducing nitrogen for 30min, slowly dripping an initiator, stopping stirring after uniformly stirring, continuously introducing nitrogen for 10-20 min, standing, and reacting for 5-8 hours to form high-molecular polymer emulsion A; adding a phase transfer agent B, a cross-linking agent C and an inert bridging plugging material D into a polymer emulsion A in sequence, wherein the mass ratio of the components is A: b: c: d is 80-90%: 4% -10%: 0-5%: 5-20 percent, and the plugging agent for the drilling fluid can be prepared by uniformly mixing.
The plugging agent for the drilling fluid provided by the prior art can rapidly change phase and thicken when meeting water to form a viscoelastic gel resident plugging slug, so that the slug strength is improved. However, the thixotropic property, the water immersion resistance, the blocking strength and the retention capability of the blocking agent are poor, so that the wide application of the blocking agent is limited.
Disclosure of Invention
In view of the above, the present invention aims to provide a controllable gelling plugging agent, which has good thixotropic property, water immersion resistance, plugging strength and retention capacity.
The invention provides a controllable gelling plugging agent, which is prepared from materials including a gel material, a thixotropic coagulation regulator, polypropylene fibers, a polyacrylamide stabilizer, a cementing agent and a water repellent;
the gel material is prepared from sulphoaluminate cement and sodium dodecyl sulfate;
the thixotropic coagulation regulator is prepared from water, acrylamide, organic chromium salt, an initiator and a crosslinking agent.
Preferably, the alkalinity coefficient Cm of the sulphoaluminate cement is 0.95-0.98, the aluminum-sulfur ratio P is less than 3.86, and the aluminum-silicon ratio N is more than 3.
Preferably, the mass ratio of the sulphoaluminate cement to the sodium dodecyl sulfate is 1: (0.2-0.4).
Preferably, the organic chromium salt is sodium dichromate or potassium dichromate.
Preferably, the initiator comprises benzoyl peroxide or N, N-dimethylaniline.
Preferably, the crosslinking agent is a titanium chelate crosslinking agent.
Preferably, the mass ratio of water, acrylamide, organic chromium salt, initiator and cross-linking agent in the thixotropic coagulation regulator is (40-60): (15-25): (0.1-0.3): (0.1-0.3): (0.1-0.3).
Preferably, the binder comprises sodium aluminate and barium oxide.
Preferably, the water repellent is an organosilicon water repellent.
Preferably, the mass ratio of the gel material, the thixotropic coagulation regulator, the polypropylene fiber, the polyacrylamide stabilizer, the cementing agent and the water repellent is 100: (80-88): (3-5): (3-5): (2-4): (1-3).
The controllable gelling plugging agent provided by the invention adopts an aluminum sulfate gel material with sulfonic groups and an organic chromium thixotropic coagulation regulator, and is matched with polypropylene fibers, a polyacrylamide stabilizer, a cementing agent and a water repellent, so that the plugging agent has better thixotropic property, water immersion resistance, plugging strength and retention capacity. The controllable gelling plugging agent provided by the invention has the adaptive temperature of 30-80 ℃, and the setting time is adjustable; the solid strength is developed quickly, the strength can reach 5MPa in 4 hours under normal pressure, the strength can reach more than 10MPa in 8 hours, and the pressure-bearing capacity can reach more than 14 MPa; the water-blocking effect is good, and the water-blocking agent is hardly corroded by formation water; and has stronger thixotropic property, can be quickly bridged and solidified in a leakage passage, and achieves good leakage stopping effect.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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 invention provides a controllable gelling plugging agent, which is prepared from materials including a gel material, a thixotropic coagulation regulator, polypropylene fibers, a polyacrylamide stabilizer, a cementing agent and a water repellent;
the gel material is prepared from sulphoaluminate cement and sodium dodecyl sulfate;
the thixotropic coagulation regulator is prepared from water, acrylamide, organic chromium salt, an initiator and a crosslinking agent.
The raw materials for preparing the controllable gelling plugging agent comprise a gel material, wherein the gel material is prepared from sulphoaluminate cement and sodium dodecyl sulfate. In the embodiment of the invention, the alkalinity coefficient Cm of the sulphoaluminate cement is 0.95-0.98. In the embodiment of the invention, the aluminum-sulfur ratio P of the sulphoaluminate cement is less than 3.86. In an embodiment of the invention, the alumino-silicate ratio N of the sulphoaluminate cement is > 3. The source of the sulphoaluminate cement is not specially limited, and the sulphoaluminate cement can be purchased from the market, for example, H-DL type sulphoaluminate cement provided by special cement GmbH in Jiahua Sichuan can be adopted.
In the invention, the gel material is prepared from sulphoaluminate cement and sodium dodecyl sulfate, and the gel material is sulphoaluminate with sulfonic groups. In the embodiment of the invention, the mass ratio of the sulphoaluminate cement to the sodium dodecyl sulfate is 1 (0.002-0.003); in other embodiments, the mass ratio of the sulphoaluminate cement to the sodium dodecyl sulfate is 1 (0.0024-0.0026); in another embodiment, the weight ratio of the sulphoaluminate cement to the sodium dodecyl sulphate is 1: 0.0025.
in the embodiment of the invention, sulphoaluminate cement and sodium dodecyl sulfate are reacted to obtain the gel material. In the embodiment of the invention, the reaction temperature of the sulphoaluminate cement and the sodium dodecyl sulfate is 45-55 ℃; in other embodiments, the temperature at which the sulphoaluminate cement and the sodium dodecyl sulphate are reacted is between 48 ℃ and 52 ℃; in a further embodiment, the temperature at which the sulphoaluminate cement and sodium dodecylsulphonate react is 50 ℃. In the embodiment of the invention, the reaction time of the sulphoaluminate cement and the sodium dodecyl sulfate is 0.5-1 h; in other embodiments, the reaction time of the sulphoaluminate cement and the sodium dodecyl sulfate is 0.6 h-0.8 h.
The raw materials for preparing the controllable gelling plugging agent comprise a thixotropic coagulation regulator, wherein the thixotropic coagulation regulator is prepared from water, acrylamide, organic chromium salt, an initiator and a cross-linking agent. In an embodiment of the invention, the water is distilled water. In an embodiment of the present invention, the organic chromium salt is sodium dichromate or potassium dichromate. In an embodiment of the invention, the initiator comprises benzoyl peroxide or N, N-dimethylaniline. In the embodiment of the invention, the amount of the initiator is 0.1-0.2% of the mass of the thixotropic pour-adjusting agent. In an embodiment of the invention, the cross-linking agent is a titanium chelate cross-linking agent. In an embodiment of the present invention, the titanium chelate crosslinking agent may be a TITE type product provided by hangzhou boiling chemical company, ltd. In the embodiment of the invention, the mass ratio of the water, the acrylamide, the organic chromium salt, the initiator and the cross-linking agent is (40-60): (15-25): (0.1-0.3): (0.1-0.3): (24.0-35.0); in other embodiments, the mass ratio of the water, the acrylamide, the organic chromium salt, the initiator and the cross-linking agent is (45-55): (18-22): (0.15-0.25): (0.15-0.25): (26.0 to 33.0); in further embodiments, the water, acrylamide, organochromium salt, initiator, and crosslinker are present in a mass ratio of 50: 20: 0.2: 0.2: 30.
in the embodiment of the invention, the preparation method of the thixotropic pour-point regulator comprises the following steps: and (3) carrying out standing reaction on water, acrylamide, organic chromium salt, an initiator and a cross-linking agent to obtain the thixotropic pour point depressant. In the embodiment of the invention, the temperature of the standing reaction is 70-90 ℃; in other embodiments, the temperature of the standing reaction is 75 ℃ to 85 ℃; in a further embodiment, the temperature of the standing reaction is 80 ℃. In the embodiment of the invention, the standing reaction time is 4-8 hours; in other embodiments, the standing reaction time is 5 to 7 hours; in a further example, the time of the standing reaction is 6 hours.
The raw materials for preparing the controllable gelling plugging agent comprise polypropylene fibers. In the embodiment of the invention, the denier of the polypropylene fiber is 14g/9000m to 16g/9000 m; in other embodiments, the polypropylene fibers have a denier of 15g/9000 m. In the embodiment of the invention, the length of the polypropylene fiber is 3 mm-38 mm; in other embodiments, the polypropylene fibers have a length of 6mm to 22 mm; in further embodiments, the polypropylene fibers have a length of 12mm to 19 mm. In the embodiment of the invention, the equivalent diameter of the polypropylene fiber is 30-40 μm; in other embodiments, the polypropylene fibers have an equivalent diameter of 32 to 38 μm; in further embodiments, the polypropylene fibers have an equivalent diameter of 34 to 36 μm. In the embodiment of the invention, the specific gravity of the polypropylene fiber is 0.9 ton/cubic meter to 0.93 ton/cubic meter; in other embodiments, the polypropylene fibers have a specific gravity of 0.91 tons per cubic meter to 0.92 tons per cubic meter. In an embodiment of the invention, the polypropylene fibres have a moisture content of < 0.1%. In the embodiment of the invention, the ignition point of the polypropylene fiber is 550-600 ℃; in other embodiments, the polypropylene fibers have a fire point of 560 ℃ to 580 ℃. In the embodiment of the invention, the elastic modulus of the polypropylene fiber is 3500 MPa-4000 MPa; in other embodiments, the polypropylene fibers have an elastic modulus of 3700MPa to 3800 MPa. In the embodiment of the invention, the tensile strength of the polypropylene fiber is 250MPa to 300 MPa; in other embodiments, the polypropylene fibers have a tensile strength of 270 to 280 MPa. The polypropylene fiber is not specially limited in source, and can be purchased from the market, for example, a product of PAM-017 type provided by Daqian environmental protection technology limited company in Foshan city can be adopted.
The raw materials for preparing the controllable gelling plugging agent comprise a polyacrylamide stabilizer. In the embodiment of the invention, the pH value of the polyacrylamide stabilizer is 6-9; in other embodiments, the pH of the polyacrylamide stabilizer is 7-8. In an embodiment of the invention, the viscosity of the polyacrylamide stabilizer is 10 seconds to 13 seconds (four cups coated); in other embodiments, the polyacrylamide stabilizer has a viscosity of 11 seconds to 12 seconds (four cups in paint). The source of the polyacrylamide stabilizer is not particularly limited in the present invention, and the polyacrylamide stabilizer can be obtained from the market, for example, a WDJ-01 model available from Puyangming chemical Co., Ltd.
The raw materials for preparing the controllable gelling plugging agent comprise a cementing agent. In an embodiment of the invention, the cement comprises sodium aluminate and barium oxide. In an embodiment of the present invention, the sodium aluminate is anhydrous sodium aluminate. The source of the cement is not particularly limited and is commercially available, for example, from Puyangming chemical company, Inc. under the model M19S.
The raw materials for preparing the controllable gelling plugging agent comprise a water repellent. In the embodiment of the invention, the water repellent is an organic silicon water repellent. In the embodiment of the invention, the active content of silane in the organosilicon water repellent is 20-25% w/w; in other embodiments, the active silane content of the organosilicon water repellent is 22-23% w/w. In the embodiment of the invention, the specific gravity of the organosilicon water repellent is 280 g/L-320 g/L; in other embodiments, the specific gravity of the organosilicon water repellent is 300 g/L. In the embodiment of the invention, the average particle size of the organosilicon water repellent is less than 500 μm. In the embodiment of the invention, the pH value of the organosilicon water repellent is neutral or weakly alkaline. In the embodiment of the invention, the residual moisture in the organosilicon water repellent is less than 0.2% w/w. The source of the water repellent is not specially limited, and the water repellent can be purchased from the market, for example, the organosilicon water repellent with the model YJG01 provided by Henan Weihui chemical company Limited can be adopted.
In the embodiment of the invention, the mass ratio of the gel material, the thixotropic coagulation regulator, the polypropylene fiber, the polyacrylamide stabilizer, the cementing agent and the water repellent is 100: (80-88): (3-5): (3-5): (2-4): (1-3); in other embodiments, the gel material, thixotropic setting regulator, polypropylene fiber, polyacrylamide stabilizer, cement and water repellent are present in a mass ratio of 100: (82-86): (3.5-4.5): (3.5-4.5): (2.5-3.5): (1.5-2.5); in further embodiments, the gel material, thixotropic setting regulator, polypropylene fibers, polyacrylamide stabilizer, cement, and water repellent are present in a mass ratio of 100: (84-85): (3.8-4.2): (3.8-4.2): 3: 2.
in the embodiment of the invention, the preparation method of the controllable gelling plugging agent provided by the invention comprises the following steps:
mixing the gel material, the thixotropic coagulation regulator, the polypropylene fiber, the polyacrylamide stabilizer, the cementing agent and the water repellent to obtain the controllable gelling plugging agent.
The mixing method is not particularly limited, and the gel material, the thixotropic coagulation regulator, the polypropylene fiber, the polyacrylamide stabilizer, the cementing agent and the water repellent are uniformly mixed by adopting a mixing technical scheme which is well known to a person skilled in the art. In the embodiment of the invention, the temperature of the mixing is 20-30 ℃; in other embodiments, the temperature of the mixing is from 24 ℃ to 26 ℃; in a further embodiment, the temperature of the mixing is 25 ℃. In the embodiment of the invention, the mixing time is 1-1.5 h; in other embodiments, the mixing time is 1.2h to 1.3 h.
In the present invention, the types, sources and mass ratios of the gel material, the thixotropic pour point depressant, the polypropylene fiber, the polyacrylamide stabilizer, the cementing agent and the water repellent are the same as those of the gel material, the thixotropic pour point depressant, the polypropylene fiber, the polyacrylamide stabilizer, the cementing agent and the water repellent according to the above technical scheme, and are not described herein again.
In the embodiment of the invention, the controllable gelling plugging agent provided by the invention takes water as slurry preparation water, and plugging slurry can be prepared. In an embodiment of the present invention, the slurry preparation water may be fresh water. In the embodiment of the invention, the controllable gelling plugging agent is mixed with water to prepare the plugging slurry. In embodiments of the invention, the density of the plugging slurry may be 1.40g/cm3～1.70g/cm3。
The controllable gelling plugging agent provided by the invention is prepared into plugging slurry, the setting time of the plugging slurry is tested according to the GB10235-2005 oil well cement standard, and the test result shows that the setting time of the plugging slurry prepared by the controllable gelling plugging agent provided by the invention is 60-240 min. The compressive strength of the plugging slurry is tested according to the GB/T19139-2012 standard of the oil well cement test method, and the test result shows that the compressive strength of the plugging slurry prepared by the controllable gelling plugging agent provided by the invention is 2.2-2.5 MPa in 2h, 5-5.5 MPa in 4h and 12-15.5 MPa in 8 h. Testing the plugging strength of the plugging slurry according to the GB/T19139-2012 standard of oil well cement test method, wherein the testing result is that the plugging strength is 14-15 MPa when the simulated leaking layer is 10-30 mm pebbles; when the simulated leaking layer is made of stones with the thickness of 5-20 mm, the leaking stoppage strength is 17.5 MPa-18.5 MPa.
The raw materials used in the following examples of the present invention are all commercially available products, the sulfoaluminate cement used is a product of H-DL model provided by special cement limited, kawa jiahua, the polypropylene fiber used is a product of PAM-017 model provided by environment protection science and technology limited, the polyacrylamide stabilizer used is a product of WDJ-01 model provided by kawa yang brightness chemical limited, the cementing agent used is a product of M19S model provided by kawa yang brightness chemical limited, the organosilicon hydrophobic agent used is a product of YJG01 model provided by kawa brightness chemical limited, and the titanium chelate cross-linking agent used is a product of TITE model provided by hanzhou boiling point chemical limited.
Example 1
Reacting 2000g of sulphoaluminate cement with 5g of sodium dodecyl sulfate at 50 ℃ for 1 hour to obtain a gel material;
60g of distilled water, 15g of acrylamide, 0.1g of sodium dichromate, 0.1g of benzoyl peroxide and 24.8g of titanium chelate crosslinking agent are reacted at 70 ℃ for 2.5 hours to obtain a thixotropic pour point depressant;
100g of gel material, 88g of thixotropic pour point regulator, 3g of polypropylene fiber, 3g of polyacrylamide stabilizer, 2g of cementing agent and 1g of organic silicon water repellent are mixed for 1.5 hours at 25 ℃ and uniformly mixed to obtain the controllable gelling plugging agent.
The controllable gelling plugging agent prepared in the embodiment 1 of the invention is suitable for being used at the temperature of 30-50 ℃.
500g of the controllable gelling plugging agent prepared in the embodiment 1 of the invention is mixed with 365g of clear water to obtain first plugging slurry, the density of the first plugging slurry prepared in the embodiment 1 of the invention is tested according to the standard of GB10238-2005 oil well cement, and the test result shows that the density of the first plugging slurry prepared in the embodiment 1 of the invention is 1.60g/cm3。
According to the method in the technical scheme, the setting time of the first plugging slurry prepared in the embodiment 1 of the invention is tested, and the test result shows that the setting time of the first plugging slurry prepared in the embodiment 1 of the invention is 62 min.
According to the method of the technical scheme, the compressive strength of the first plugging slurry prepared in the embodiment 1 of the invention is tested, and the test result shows that the compressive strength of the first plugging slurry prepared in the embodiment 1 of the invention is 2.45MPa in 2h, 5.5MPa in 4h and 12.25MPa in 8 h.
500g of the controllable gelling plugging agent prepared in the invention example 1 and 635g of clear water are mixed to obtain a second plugging slurry. According to the method of the technical scheme, the density of the second leakage blocking slurry prepared in the embodiment 1 of the invention is tested, and the test result shows that the density of the second leakage blocking slurry prepared in the embodiment 1 of the invention is 1.40g/cm3。
According to the method in the technical scheme, the setting time of the second leakage blocking slurry prepared in the embodiment 1 of the invention is tested, and the test result shows that the setting time of the second leakage blocking slurry prepared in the embodiment 1 of the invention is 65 min.
According to the method of the technical scheme, the compressive strength of the second plugging slurry prepared in the embodiment 1 of the invention is tested, and the test result shows that the compressive strength of the second plugging slurry prepared in the embodiment 1 of the invention is 2.40MPa in 2h, 5.45MPa in 4h and 12.10MPa in 8 h.
500g of the controllable gelling plugging agent prepared in the invention example 1 and 450g of clear water are mixed to obtain a third plugging slurry. According to the method of the technical scheme, the leakage stoppage strength of the third leakage stoppage slurry prepared in the embodiment 1 of the invention is tested, and the test result shows that the leakage stoppage strength of the third leakage stoppage slurry prepared in the embodiment 1 of the invention is 14.2MPa when the simulated leakage layer is 10-30 mm pebbles; when the simulated leaking layer is made of stones with the thickness of 5-20 mm, the leaking stoppage strength is 17.7 MPa.
Example 2
Reacting 2000g of sulphoaluminate cement with 2.0g of sodium dodecyl sulfate at 50 ℃ for 1 hour to obtain a gel material;
40g of distilled water, 25g of acrylamide, 0.3g of sodium dichromate, 0.3g of N, N-dimethylaniline and 35g of titanium chelate crosslinking agent are reacted at 70 ℃ for 2.5 hours to obtain the thixotropic pour point depressant;
100g of gel material, 80g of thixotropic pour point regulator, 5g of polypropylene fiber, 5g of polyacrylamide stabilizer, 4g of cementing agent and 3g of organic silicon water repellent are mixed for 1.5 hours at 25 ℃ and uniformly mixed to obtain the controllable gelling plugging agent.
The controllable gelling plugging agent prepared in the embodiment 2 of the invention is suitable for being used at 60-80 ℃.
500g of the controllable gelling plugging agent prepared in example 2 of the invention and 365g of clear water are mixed to obtain a first plugging slurry, and the first plugging slurry prepared in example 2 of the invention is tested according to the standard of GB10238-2005 oil well cementThe density of the leaking slurry, as a result of the test, was 1.60g/cm for the first leaking stoppage slurry prepared in example 2 of the present invention3。
According to the method in the technical scheme, the setting time of the first leakage blocking slurry prepared in the embodiment 2 of the invention is tested, and the test result shows that the setting time of the first leakage blocking slurry prepared in the embodiment 2 of the invention is 220 min.
According to the method of the technical scheme, the compressive strength of the first plugging slurry prepared in the embodiment 2 of the invention is tested, and the test result shows that the compressive strength of the first plugging slurry prepared in the embodiment 2 of the invention is 2.25MPa in 2h, 5.10MPa in 4h and 15.45MPa in 8 h.
500g of the controllable gelling plugging agent prepared in example 2 of the present invention was mixed with 635g of clear water to obtain a second plugging slurry. According to the method of the technical scheme, the density of the second leakage blocking slurry prepared in the embodiment 2 of the invention is tested, and the test result shows that the density of the second leakage blocking slurry prepared in the embodiment 2 of the invention is 1.40g/cm3。
According to the method in the technical scheme, the setting time of the second leakage blocking slurry prepared in the embodiment 2 of the invention is tested, and the test result shows that the setting time of the second leakage blocking slurry prepared in the embodiment 2 of the invention is 235 min.
According to the method of the technical scheme, the compressive strength of the second plugging slurry prepared in the embodiment 2 of the invention is tested, and the test result shows that the compressive strength of the second plugging slurry prepared in the embodiment 2 of the invention is 2.10MPa in 2h, 5.05MPa in 4h and 15.20MPa in 8 h.
500g of the controllable gelling plugging agent prepared in the embodiment 2 of the invention and 450g of clear water are mixed to obtain a third plugging slurry. According to the method of the technical scheme, the leakage stoppage strength of the third leakage stoppage slurry prepared in the embodiment 2 of the invention is tested, and the test result shows that the leakage stoppage strength of the third leakage stoppage slurry prepared in the embodiment 2 of the invention is 14.8MPa when the simulated leakage layer is 10-30 mm pebbles; when the simulated leaking layer is made of stones with the thickness of 5-20 mm, the leaking stoppage strength is 18.5 MPa.
The controllable gelling plugging agent prepared by the embodiment of the invention has adjustable setting time and fast development of the setting strength, and almost has no influence on the setting time and the compressive strength after being mixed with 1 time of water.
Example 3
The coke page 65-2HF well is a development well drilled by 70126 team of Hanjiang drilling II company, the well is drilled within 12 and 30 days in 2014, the original well cannot be drilled normally due to the complex conditions of well leakage, well collapse and the like in the drilling process, then the drilling machine is shifted by 10 meters and is drilled again, a new well is drilled within 26 days in 2015 2 and 26 days, however, the complex conditions of multiple collapse, malignant leakage and the like occur in the drilling process, the well is forced to enter a surface casing pipe for well cementation under 606 meters, the leakage occurs after the surface is forcibly cemented within 4 months and 4 days, the leakage rate reaches 50m when the well is drilled to 690 meters3H, when the well is drilled to 869 meters, the lost-return malignant leakage rate reaches 260m3And/h, during the period of 3 times, the wall-fixing pressure-bearing plugging agent (GBF) provided by Chengdu Daokou limited company and the synthetic plugging agent for drilling (LCC series) are adopted, 2 times of plugging by adding cement into gel (chemical gel of drilling research institute of China Petroleum engineering limited company) and 2 times of plugging by drilling plugging slurry (drilling plugging slurry of drilling research institute of China Petroleum engineering limited company) are not successful.
And after 4 months and 19 days, a drilling tool is lowered to a position of 600m by adopting the controllable gelling plugging agent provided by the embodiment 1 of the invention and is injected into the position of 20m3The controllable gelling plugging agent is filled with clear water after 5 hours, the shaft can be filled with the controllable gelling plugging agent, then the controllable gelling plugging agent is put into a drilling tool for drilling, the well is swept to 690m for well leakage, the leakage speed is 30m3H, sweeping to 869m at the bottom of the well and leaking at 42m3And/h, the expected effect is achieved.
In order to completely eradicate the leakage, the drilling tool is lowered to the position of 600m again in 20 days after 4 months, the well sealing device is closed, and the controllable gelling plugging agent 20m provided by the embodiment 1 of the invention is injected3And drilling again to the wellhead for waiting for coagulation.After 5 hours, the well is drilled in a drilling mode, and no leakage occurs when the well is drilled to 1060m, so that the problem of malignant leakage of the well is successfully solved.
The controllable gelling plugging agent provided by the embodiment of the invention has obvious plugging effect on leakage loss of large cracks and karst caves, strong retention capability, strong scouring resistance and high success rate of plugging once.
The embodiment shows that the controllable gelling plugging agent is prepared from materials including a gel material, a thixotropic coagulation regulator, polypropylene fibers, a polyacrylamide stabilizer, a cementing agent and a water repellent; the gel material is prepared from sulphoaluminate cement and sodium dodecyl sulfate; the thixotropic coagulation regulator is prepared from water, acrylamide, organic chromium salt, an initiator and a crosslinking agent. The controllable gelling plugging agent provided by the invention adopts an aluminum sulfate gel material with sulfonic groups and an organic chromium thixotropic coagulation regulator, and is matched with polypropylene fibers, a polyacrylamide stabilizer, a cementing agent and a water repellent, so that the plugging agent has better thixotropic property, water immersion resistance, plugging strength and retention capacity.
Claims (6)
1. A controllable gelling plugging agent is prepared from materials including a gel material, a thixotropic coagulation regulator, polypropylene fibers, a polyacrylamide stabilizer, a cementing agent and a water repellent;
the gel material is prepared from sulphoaluminate cement and sodium dodecyl sulfate;
the thixotropic pour point regulator is prepared from water, acrylamide, organic chromium salt, an initiator and a cross-linking agent;
the initiator comprises benzoyl peroxide or N, N-dimethylaniline;
the cross-linking agent is a titanium chelate cross-linking agent;
the cementing agent comprises sodium aluminate and barium oxide;
the water repellent is an organic silicon water repellent.
2. The controllable gelling plugging agent according to claim 1, wherein the alkalinity coefficient Cm of the sulphoaluminate cement is 0.95-0.98, the aluminum-sulfur ratio P is less than 3.86, and the aluminum-silicon ratio N is more than 3.
3. The controllable gelling plugging agent according to claim 1, wherein the mass ratio of the sulphoaluminate cement to the sodium dodecyl sulfate is 1: (0.002-0.003).
4. The controlled gelling plugging agent according to claim 1, wherein the organic chromium salt is sodium dichromate or potassium dichromate.
5. The controllable gelling plugging agent according to claim 1, wherein the thixotropic coagulation adjusting agent comprises water, acrylamide, organic chromium salt, an initiator and a cross-linking agent in a mass ratio of (40-60): (15-25): (0.1-0.3): (0.1-0.3): (24-35).
6. The controllable gelling plugging agent according to claim 1, wherein the mass ratio of the gel material, the thixotropic coagulation regulator, the polypropylene fiber, the polyacrylamide stabilizer, the cementing agent and the water repellent is 100: (80-88): (3-5): (3-5): (2-4): (1-3).
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| CN110724506B (en) * | 2018-07-16 | 2022-01-14 | 长江大学 | Fractured reservoir cementing fiber particle bridging agent and preparation method thereof |
| CN110079286B (en) * | 2019-05-29 | 2021-07-06 | 北京探矿工程研究所 | Delayed crosslinking gel composition for plugging and preparation method thereof |
| CN110144198B (en) * | 2019-06-13 | 2021-12-03 | 中国石油天然气集团有限公司 | Gel plugging agent for oil-based drilling fluid and preparation method thereof |
| CN110791266B (en) * | 2019-06-28 | 2021-10-08 | 大港油田集团有限责任公司 | Granular polymer channeling channel plugging agent and preparation method thereof |
| CN111100616A (en) * | 2020-01-03 | 2020-05-05 | 中国石油化工股份有限公司 | Cement slurry system for casing well cementation |
| CN115678520A (en) * | 2021-07-29 | 2023-02-03 | 中石化石油工程技术服务有限公司 | Medium-high temperature controllable cementing plugging material and application thereof |
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| CN103396774A (en) * | 2013-08-09 | 2013-11-20 | 西南石油大学 | Plugging agent and preparation method thereof |
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