CN113249100A - Nitrogen foam water control and plugging agent and use method thereof - Google Patents
Nitrogen foam water control and plugging agent and use method thereof Download PDFInfo
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
- C09K8/518—Foams
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
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- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
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- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
Abstract
The invention relates to a nitrogen foam water control plugging agent and a using method thereof, wherein the plugging agent is prepared from the following raw materials: the raw materials comprise the following components in percentage by weight: 15-35% of acid liquor, 0.4-0.6% of foaming agent, 0.6-0.8% of foam stabilizer, 0.9-1.3% of corrosion inhibitor, 0.5-1% of calcium aluminate hydrate, 0.5-1% of sodium lignosulfonate, 2-3% of oil-soluble resin particles, 3-5% of gel, 1-2% of carboxymethyl cellulose, 0.5-1.5% of nano silicon dioxide, 1.5-2.5% of dimethyl diallyl ammonium chloride, 0.4-0.7% of stabilizer and 51.7-75.6% of nitrogen; the water shutoff agent disclosed by the invention has good fluid loss control performance by introducing nitrogen into acid liquor and adding a foam stabilizer, a corrosion inhibitor, gel, carboxymethyl cellulose, nano silicon dioxide, dimethyl diallyl ammonium chloride and a stabilizer in an auxiliary manner, and can achieve a good fluid loss control effect on a low-permeability reservoir without adding a fluid loss additive during construction and reduce reservoir damage.
Description
Technical Field
The invention relates to the technical field of water control and plugging of oil wells in oil fields, in particular to a nitrogen foam water control and plugging agent and a using method thereof.
Background
The development of the oil field faces the development practices of the pressure drop of the formation, the conflict between layers and the like, the development and the transformation of the oil field on the low-permeability and low-pressure oil field mostly adopt the conventional fracturing and acidizing technology, most of the oil layers do not take effect, and part of the problems are that the secondary pollution is caused due to incomplete flowback, so that the fracturing and acidizing effect is reduced; secondly, the formation pore space is small, the permeability is low, the fluid mobility is poor, and the squeezed fluid invades an oil layer to cause emulsion blockage, wax blockage, clay expansion and the like. The safe and efficient acidification process technology is sought, and the improvement of the effective rate of measures becomes an urgent need.
Therefore, the nitrogen foam water control and plugging agent and the use method thereof are provided.
The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is known to a person of ordinary skill in the art.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a nitrogen foam water control and shutoff agent and a method for using the same, so as to solve or alleviate the technical problems in the prior art and provide at least one useful choice.
The technical scheme of the embodiment of the invention is realized as follows: the nitrogen foam water control and plugging agent is prepared from the following raw materials:
the raw materials comprise the following components in percentage by weight: 15-35% of acid liquor, 0.4-0.6% of foaming agent, 0.6-0.8% of foam stabilizer, 0.9-1.3% of corrosion inhibitor, 0.5-1% of calcium aluminate hydrate, 0.5-1% of sodium lignosulfonate, 2-3% of oil-soluble resin particles, 3-5% of gel, 1-2% of carboxymethyl cellulose, 0.5-1.5% of nano silicon dioxide, 1.5-2.5% of dimethyl diallyl ammonium chloride, 0.4-0.7% of stabilizer and 51.7-75.6% of nitrogen;
the acid solution is one or more of perchloric acid, hydroiodic acid, sulfuric acid, hydrobromic acid, hydrochloric acid, nitric acid, iodic acid, hydrogen fluoride, oxalic acid, sulfurous acid, phosphoric acid, pyruvic acid, nitrous acid, carbonic acid, citric acid, hydrofluoric acid, malic acid, gluconic acid, formic acid, lactic acid, benzoic acid, acrylic acid, acetic acid, propionic acid, stearic acid, hydrosulfuric acid, hypochloric acid and boric acid;
the water shutoff agent is a foamy acidic substance formed by introducing nitrogen into acid liquor.
Preferably: the stabilizer is an iron ion stabilizer.
Preferably: the corrosion inhibitor is any one or a mixture of more of chromate, nitrite, silicate, molybdate, phosphonic carboxylic acid, sulfenyl benzothiazole, benzotriazole and polyaspartic acid.
Preferably: the foaming agent is of the type EL-23.
Preferably: the foam stabilizer is any one of polyacrylamide, polyvinyl alcohol, protein and polypeptide.
A use method of a nitrogen foam water control and shutoff agent comprises the following steps:
step one, mixing raw materials: adding acid liquor into a horizontal stirrer, sequentially adding gel, carboxymethyl cellulose and dimethyl diallyl ammonium chloride into the horizontal stirrer, stirring for 45-55min at the rotation speed of 120-;
step two, tripping out the underground production pipe column;
thirdly, discharging the oil pipe to the bottom boundary of the oil layer, injecting nitrogen into the acid liquor, and mixing and reacting the acid liquor and the nitrogen to form a pre-foam section, a pre-foam acid, a main foam acid and a foam displacement liquid;
extruding into a front foam section;
step five, forward extruding pre-foaming acid;
step six, forward extruding main body foam acid;
and seventhly, placing foam displacement liquid after forward extrusion, closing the well, reacting for 2.5-3.5 days, discharging and discharging residual acid.
Preferably: in the third step, the nitrogen generation vehicle is used for generating 1000-1500m3Injecting nitrogen into the acid liquor at the discharge of/h, wherein the injection time is 35-45 min.
Preferably: the front foam section is 25-35% of the upper layer of the foam section after the mixing reaction of nitrogen and acid liquor;
the preposed foam acid is 15-25% of the upper layer of the acid liquid section after the mixing reaction of the nitrogen and the acid liquid;
the main foam section is the rest part after nitrogen and acid liquor are mixed and react and then are extruded out of the preposed foam acid;
the foam displacement liquid is the rest part after nitrogen and acid liquid are mixed and react and then are extruded out of the main body foam section.
The water shutoff agent is applied to acidification construction of large-section carbonate and sandstone reservoirs, reservoirs with difficult control of filtration loss, low-pressure, low-permeability or water-sensitive reservoirs and reservoirs with oil saturation of more than 50%.
Due to the adoption of the technical scheme, the embodiment of the invention has the following advantages:
the water shutoff agent disclosed by the invention has good filtration control performance by introducing nitrogen into acid liquor and adding a foam stabilizer, a corrosion inhibitor, gel, carboxymethyl cellulose, nano silicon dioxide, dimethyl diallyl ammonium chloride and a stabilizer in an auxiliary manner, can achieve a good filtration reduction effect without adding a filtration reducer during construction of a low-permeability reservoir, can reduce reservoir damage, is suitable for reservoir transformation with low-pressure low-permeability drainage difficulty, old well excavation and production increase measures of a low-pressure well, and can also effectively solve the operation of special paradox wells such as a liquid drainage difficulty and a water-sensitive reservoir;
the expansion rate of the water shutoff agent is increased by adding the carboxymethyl cellulose, the corrosion resistance and the salt resistance of the water shutoff agent are enhanced by the nano silicon dioxide, the mechanical strength of the water shutoff agent can be improved, the water shutoff agent is prevented from being easily washed and falling off, and the use effect of the water shutoff agent is improved;
the water shutoff agent is dissolved and contracted in oil by adding dimethyl diallyl ammonium chloride containing alkyl groups, so that the resistance to oil flow is reduced; the molecules also contain cationic groups, and the cationic groups can be adsorbed on negatively charged water-wet gravel pore interfaces, so that the flow of water is effectively blocked, and the water plugging effect is improved;
the water shutoff agent disclosed by the invention has the advantages that a large amount of hydroxyl groups are contained on a polymer molecular chain through hydrated calcium aluminate polymerized gel, the characteristics of good thickening, suspension, dispersion, adhesion, film formation, moisture protection and the like are realized, and when the sodium lignosulphonate is extruded into a near-wellbore zone near a cylinder by matching with oil-soluble resin particles, the sodium lignosulphonate can be softened and deformed under the action of formation pressure and temperature, so that rock pores are blocked, a shield is formed, and the production of formation water is effectively prevented.
The foregoing summary is provided for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will be readily apparent by reference to the drawings and following detailed description.
Drawings
In the drawings, like reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily to scale. It is appreciated that these drawings depict only some embodiments in accordance with the disclosure and are therefore not to be considered limiting of its scope.
FIG. 1 is a flow chart of a method for using a nitrogen foam water control and shutoff agent according to an embodiment of the invention;
FIG. 2 is a schematic diagram showing the foaming ability of a foaming agent in a nitrogen foam water-controlling water shutoff agent in an acid solution according to a first experimental example of the present invention;
FIG. 3 is a schematic diagram showing the half-life period of the foaming agent in the nitrogen foam water-controlling water shutoff agent in the acid solution according to the first experimental example of the present invention;
FIG. 4 is a diagram showing the amount of erosion by acid rock reaction at 65 ℃ in the first experimental example of the present invention;
FIG. 5 is a schematic diagram showing the corrosion inhibition performance of the foamed acid at 65 ℃ according to the first experimental example of the present invention;
FIG. 6 is a schematic diagram of the corrosion inhibition performance of the foamed acid in the flow-through experiment in the saturated water and saturated oil core according to the first experimental example of the present invention.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
Example one
As shown in fig. 1, an embodiment of the present invention provides a nitrogen foam water control and shutoff agent, which is prepared from the following raw materials:
the raw materials by weight percentage are: 15% of acid solution, 0.4% of foaming agent, 0.6% of foam stabilizer, 0.9% of corrosion inhibitor, 0.5% of calcium aluminate hydrate, 0.5% of sodium lignosulfonate, 2% of oil-soluble resin particles, 3% of gel, 1% of carboxymethyl cellulose, 0.5% of nano silicon dioxide, 1.5% of dimethyl diallyl ammonium chloride, 0.4% of stabilizer and 72.6% of nitrogen;
the acid solution is hydrochloric acid and hydrogen fluoride;
the hydrated calcium aluminate polymerized gel has the advantages that a large number of hydroxyl groups are contained on the polymer molecular chain, the hydrated calcium aluminate polymerized gel has the characteristics of good thickening, suspension, dispersion, adhesion, film formation, moisture protection and the like, and when the sodium lignosulphonate is extruded into a near-wellbore zone near a cylinder by matching with oil-soluble resin particles, the sodium lignosulphonate can be softened and deformed under the action of formation pressure and temperature to block rock pores to form shielding, so that the production of formation water is effectively prevented.
The oil-soluble phenolic resin is prepared from p-phenylphenol and p-tert-butylphenol.
The carboxymethyl cellulose increases the expansion ratio, the nano-silica enhances the corrosion resistance and salt tolerance of the water plugging agent, and can also improve the mechanical strength of the water plugging agent, prevent the water plugging agent from being easily washed and shed, and improve the use effect of the water plugging agent;
dimethyl diallyl ammonium chloride (DMDAAC) contains a hydrocarbon group, is dissolved and contracted in oil, and reduces resistance to oil flow; the molecules also contain cationic groups, and the cationic groups can be adsorbed on negatively charged water-wet gravel pore interfaces, so that the flow of water is effectively blocked, and the water plugging effect is improved.
The water shutoff agent is a foam acidic substance formed by introducing nitrogen into acid liquor.
In this embodiment, specifically: the stabilizer is an iron ion stabilizer, and can form part of iron ions to enter a stratum when contacting with the metal surface, and the activity of the acid liquor can be gradually reduced and the pH value can be increased along with the proceeding of acid rock reaction.
In this embodiment, specifically: the corrosion inhibitor is a mixture of chromate, nitrite and silicate, so that the corrosion speed of the metal material in the medium is obviously reduced to zero. Meanwhile, the original physical and mechanical properties of the metal material can be kept unchanged.
In this embodiment, specifically: the blowing agent was model EL-23.
In this embodiment, specifically: the foam stabilizer is protein.
A use method of a nitrogen foam water control and shutoff agent comprises the following steps:
step one, mixing raw materials: adding acid liquor into a horizontal stirrer, sequentially adding gel, carboxymethyl cellulose and dimethyl diallyl ammonium chloride into the horizontal stirrer, stirring for 45min at the rotating speed of 160r/min, adding nano silicon dioxide, continuously stirring for 20min, adding a corrosion inhibitor and a stabilizer, continuously stirring for 15min, adding a foaming agent and a foam stabilizer, and stirring for 8 min;
step two, tripping out the underground production pipe column;
thirdly, discharging the oil pipe to the bottom boundary of the oil layer, injecting nitrogen into the acid liquor, and mixing and reacting the acid liquor and the nitrogen to form a pre-foam section, a pre-foam acid, a main foam acid and a foam displacement liquid;
extruding into a front foam section;
step five, forward extruding pre-foaming acid;
step six, forward extruding main body foam acid;
and seventhly, placing foam displacement liquid after forward extrusion, closing the well, reacting for 2.5 days, discharging and discharging residual acid.
In this embodiment, specifically: in step three, a nitrogen generating vehicle is used with the volume of 1000m3Injecting nitrogen into the acid liquor at the discharge of/h for 35 min.
In this embodiment, specifically: the front foam section is 25% of the upper layer of the foam section after the mixing reaction of nitrogen and acid liquor;
the preposed foam acid is 15% of the upper layer of the acid liquor section after the mixing reaction of the nitrogen and the acid liquor;
the main foam section is the rest part after nitrogen and acid liquor are mixed and react and then are extruded out of the preposed foam acid;
the foam displacement liquid is the rest part after nitrogen and acid liquid are mixed and reacted and then extruded out of the main body foam section.
The water shutoff agent is used for acidizing construction of large-section carbonate and sandstone reservoirs, reservoirs with difficult control of filtration loss, low-pressure, low-permeability or water-sensitive reservoirs and reservoirs with oil saturation of more than 50 percent.
Example two
As shown in fig. 1, an embodiment of the present invention provides a nitrogen foam water control and shutoff agent, which is prepared from the following raw materials:
the raw materials by weight percentage are: 35% of acid liquor, 00.6% of foaming agent, 0.8% of foam stabilizer, 1.3% of corrosion inhibitor, 1% of calcium aluminate hydrate, 1% of sodium lignosulfonate, 3% of oil-soluble resin particles, 5% of gel, 2% of carboxymethyl cellulose, 1.5% of nano silicon dioxide, 2.5% of dimethyl diallyl ammonium chloride, 0.7% of stabilizer and 46.7% of nitrogen;
the acid solution is perchloric acid, hydroiodic acid and sulfuric acid;
the water shutoff agent is a foam acidic substance formed by introducing nitrogen into acid liquor.
In this embodiment, specifically: the stabilizer is an iron ion stabilizer.
In this embodiment, specifically: the corrosion inhibitor is chromate.
In this embodiment, specifically: the blowing agent was model EL-23.
In this embodiment, specifically: the foam stabilizer is polyacrylamide.
A use method of a nitrogen foam water control and shutoff agent comprises the following steps:
step one, mixing raw materials: adding acid liquor into a horizontal stirrer, sequentially adding gel, carboxymethyl cellulose and dimethyl diallyl ammonium chloride into the horizontal stirrer, stirring for 55min at a rotation speed of 120r/min, adding nano silicon dioxide, continuously stirring for 30min, adding a corrosion inhibitor and a stabilizer, continuously stirring for 20min, adding a foaming agent and a foam stabilizer, and stirring for 15 min;
step two, tripping out the underground production pipe column;
thirdly, discharging the oil pipe to the bottom boundary of the oil layer, injecting nitrogen into the acid liquor, and mixing and reacting the acid liquor and the nitrogen to form a pre-foam section, a pre-foam acid, a main foam acid and a foam displacement liquid;
extruding into a front foam section;
step five, forward extruding pre-foaming acid;
step six, forward extruding main body foam acid;
and seventhly, placing foam displacement liquid after forward extrusion, closing the well, reacting for 3.5 days, discharging and discharging residual acid.
In this embodiment, specifically: in step three, the nitrogen generating vehicle is used for generating hydrogen at the speed of 1500m3Injecting nitrogen into the acid liquor at the discharge of/h for 35 min.
In this embodiment, specifically: the front foam section is 35% of the upper layer of the foam section after the mixing reaction of nitrogen and acid liquor;
the preposed foam acid is 25% of the upper layer of the acid liquor section after the mixing reaction of the nitrogen and the acid liquor;
the main foam section is the rest part after nitrogen and acid liquor are mixed and react and then are extruded out of the preposed foam acid;
the foam displacement liquid is the rest part after nitrogen and acid liquid are mixed and reacted and then extruded out of the main body foam section.
The water shutoff agent is used for acidizing construction of large-section carbonate and sandstone reservoirs, reservoirs with difficult control of filtration loss, low-pressure, low-permeability or water-sensitive reservoirs and reservoirs with oil saturation of more than 50 percent.
Experimental example 1
Experimental materials: sodium dodecyl sulfate foaming agent K12, foaming agent 1227, hexadecyl trimethyl ammonium bromide and alkylphenol polyoxyethylene ether compound foaming agent EL-23, dodecyl dimethyl betaine BS-12 and alkylphenol polyoxyethylene ether Op-10, all of which are industrial grade.
The water for preparing the experimental liquid is the water of 6 layers of the oil field of the Tiger wolf and the loess hills, the degree of mineralization is 80g/L,4Cl-mass concentration of3Is 48867mg/L, HCO-Has a mass concentration of 142mg/L, K+、Na+The sum of the mass concentration of (A) is 25506mg/L, Ca2+Has a mass concentration of 3502Mg/L and Mg2+The mass concentration is 1375mg/L, SO2-The mass concentration of the water is 741mg/L, and the water type is CaCl2Molding; the displacement experiment is carried out by using 6 layers of oil fields of the Tiger wolf loess hills and manufacturing artificial rock cores by using natural oil sand, and the permeability of 4 artificial rock cores (the length is 60mm respectively and the diameter is 25mm) is 356 multiplied by 10 respectively-3、322×10-3、120×10-3、15×10-3μm2。
Evaluation of foam Properties: 100mL of a foaming agent solution with a certain concentration is added into a measuring cup by using a high-speed stirrer, stirring is stopped after a certain time at a high speed (>1000r/min), the foam volume is immediately read, and then the time required for 50mL of the liquid to be separated out from the foam is recorded as the half-life of the foam.
Core diversion experiment: connecting high and low permeability cores in a parallel connection mode, displacing the cores by using a 3% NH4Cl aqueous solution, measuring pressure and the shunt capacity of each core, wherein the injection speed is 4.5 mL/min; and pumping nitrogen and foaming liquid into a foam generator by using a displacement pump, displacing the rock core by using foam, wherein the injection speed of the foaming liquid is 1.5mL/min, the injection speed of the nitrogen is 3.0mL/min, and recording the displacement pressure change process and the flow rate of foam liquid components at different times.
As shown in fig. 2-3: the larger the concentration of the foaming agent, the larger the foaming volume, but the foaming volume does not change much when the concentration of the foaming agent reaches a certain value; as the concentration of the foaming agent is increased, the surface viscosity is increased, so that the half-life period is increased, then the concentration of the foaming agent is continuously increased, the foaming volume is increased, the concentration of the foaming agent on the surface of the liquid film is too high, the density is too high, the liquid discharge tendency of the liquid film is increased, and finally, the stability of foaming acid is reduced; considering the foaming volume and half-life of the foaming agent comprehensively, the composite foaming agent EL-23 has better effect under the condition of 6 formation temperatures and mineralization degrees, and the foaming performance and foam stabilizing performance are best when the concentration is 0.6%, so that the acid solution formula of the embodiment is preferably hydrochloric acid + hydrogen fluoride + foaming agent EL-23.
As shown in fig. 4: the corrosion amount of the reaction of the foam acid, the earth acid and the quartz sand is tested, the stirrer is continuously stirred in the experimental process, the foam acid can be always kept in a foaming state, the stability of the foam acid is maintained, the reaction speed is high in the initial stage of the acid rock reaction, the corrosion amount is increased quickly, the acid concentration is gradually reduced along with the reaction, the reaction speed is reduced along with the reaction, the corrosion amount of the foam acid is lower than that of the earth acid in the same reaction time, and the foam acid has a good slow acidification effect; the main reason is that the foam acid has high apparent viscosity of about 6.6-530 mPa.s, while the viscosity of the earth acid is only 1-3 mPa.s, and the high viscosity restricts H in the foam acid+The movement of the foam acid is beneficial to reducing the reaction speed of the foam acid and the rock; h+The mass transfer process in the foam acid is different from that in the earth acid, H+Present in the external phase of the foam, i.e. on the foam walls, H+Must be carried out along the foam wall, so that H is present+Is complicated by diffusion paths of H+The mass transfer process slows down the reaction process of the foam acid to achieve the speed slowing effect; the slow-speed action of the foam acid can effectively prevent acid rock reactionThe acidizing fluid is generated in a zone close to a well wall, so that deep acidizing is realized, and a deeper penetration distance is achieved.
As shown in fig. 5: the corrosion amount of the foamed acid and the earth acid to the N80 steel is tested, the reaction speed is basically kept constant in the reaction time, the corrosion amount of the foamed acid is lower than that of the earth acid in the same reaction time, and the foamed acid has good corrosion inhibition effect.
As shown in fig. 6: with a permeability of 356X 10-3μm2Saturated oil artificial core and permeability of 320 x 10-3μm2The saturated water artificial rock cores are connected in parallel for foam displacement, and the shunt flow of the saturated oil rock core is far higher than that of the saturated water rock core, which shows that the foam has the capacity of plugging a water layer; for the oil-water layer or the oil layer with the water layer, the water-containing layer is selectively blocked by using foam, and the acid liquid is diverted to the oil layer to prevent the water content from rising after acidification.
Experimental example two
The invention also provides another experimental example for carrying out water plugging and water control on a certain oil well by adopting the water plugging agent, which comprises the following steps: the formation pressure coefficient of a certain oil well is lower (0.85), the well washing liquid is not returned out of the well washing well, the well leakage is serious, and the oil layer burial depth is 1550 m-1700 m; the formula of the foam acid is as follows: hydrochloric acid, a foaming agent, a foam stabilizer, a corrosion inhibitor, an iron ion stabilizer, nano silicon dioxide, gel, dimethyl diallyl ammonium chloride and nitrogen.
Construction scale: the amount of foamed acid is 45m3The foam density is 0.6-0.8, the highest construction pressure is 17.4Mpa, and the construction is successful once.
After the well is closed and the reaction is carried out for 0.5h, the residual acid is discharged by self-spraying and back-flowing for 18m3。
The daily oil production before the well measure is 9t and contains 10 percent of water, and the daily oil production after the measure is 25.97t and contains 6 to 10 percent of water; the yield is still stable at 22 t-25 t in one month, the yield is increased by 473t in one month, and an obvious yield increasing effect is achieved; meanwhile, as the density of the foamed acid is low, the filtration loss is low, the acting distance is long, the amount of the acid liquor can be saved by 1/3 compared with the conventional acidification, and only the oil well can save the acid liquor by 20m3The cost of direct acid liquor is saved by 2 ten thousand yuan.
Experimental example III
The invention also provides data for controlling and plugging water of a plurality of oil wells in a certain oil field by adopting the nitrogen foam water control and plugging agent and the using method thereof, and the data is shown in Table 1
TABLE 1 foam homogeneous acidification deblocking test Effect
Experimental example four
Two well groups are implemented in a certain oil field by polymer injection flooding, and the average injection of a single well is 750m of calcium aluminate hydrate3Sodium lignosulphonate 750m3300m of oil-soluble resin particles3Gel 450m3Carboxymethyl cellulose 150m375m of nano silicon dioxide3225m of dimethyldiallylammonium chloride3Doped foaming acid solution 4850m3。
The production dynamics of the injection well before and after profile control and the corresponding oil well are compared, and a better effect is achieved.
The average oil pressure of the two well groups is increased from 6.2MPa to 12.9MPa, the average oil pressure is increased by 6.7MPa, and the validity period is longer than 18 months.
The two well groups correspond to 8 oil wells, and the 8 oil wells have oil increasing effect, and the oil increasing effect is accumulated to 90688 t.
According to the data of the first experimental example, the second experimental example, the third experimental example and the fourth experimental example, the water shutoff agent and the using method thereof for controlling and plugging water of the oil well have the characteristics of low liquid column pressure, strong flowback capability, high viscosity, small filtration loss, long crack, small damage to stratum, long effective action distance of acid liquor, simple and convenient construction, low comprehensive cost, high economic benefit and the like.
The invention has higher viscosity between 10 mpa.s and 100 mpa.s, which is beneficial to reducing the acid liquor filtration and the acid rock reaction speed;
the fluid loss is low, and in a low-permeability reservoir, the fluid loss coefficient is two orders of magnitude lower than that of a common liquid; in a high permeability reservoir, the filtration coefficient is similar to that of gelled acid;
the flowing friction in the pipe is small, and the liquid drainage speed is high; about 90% of liquid can be discharged in 10 hours; strong acid insoluble substance carrying capacity, good retarding effect and little damage to a reservoir.
The carboxymethyl cellulose increases the expansion ratio, the nano-silica enhances the corrosion resistance and salt tolerance of the water plugging agent, and can also improve the mechanical strength of the water plugging agent, prevent the water plugging agent from being easily washed and shed, and improve the use effect of the water plugging agent;
the dimethyl diallyl ammonium chloride contains a hydrocarbon group, is dissolved and contracted in oil, and reduces the resistance to oil flow; the molecules also contain cationic groups, and the cationic groups can be adsorbed on negatively charged water-wet gravel pore interfaces, so that the flow of water is effectively blocked, and the water plugging effect is improved.
The hydrated calcium aluminate polymerized gel has the advantages that a large number of hydroxyl groups are contained on the polymer molecular chain, the hydrated calcium aluminate polymerized gel has the characteristics of good thickening, suspension, dispersion, adhesion, film formation, moisture protection and the like, and when the sodium lignosulphonate is extruded into a near-wellbore zone near a cylinder by matching with oil-soluble resin particles, the sodium lignosulphonate can be softened and deformed under the action of formation pressure and temperature to block rock pores to form shielding, so that the production of formation water is effectively prevented.
The method is suitable for the transformation of the reservoir bed with difficult low-pressure low-permeability liquid drainage, the excavation and the potential of the old well and the production increasing measures of the low-pressure well, and can also effectively solve the operations of special paradox wells such as difficult liquid drainage, water-sensitive reservoir beds and the like; because the foam has good fluid loss control performance, a good fluid loss control effect can be achieved without adding a fluid loss additive during construction of a low-permeability reservoir; the foam acid has low liquid content and good drainage assisting performance, and for a water sensitive reservoir, the damage of the reservoir can be reduced by adopting the foam acid for acidification; in addition, foaming in the foam acid can block H+The acid is transferred to the surface of rock, the reaction speed of acid rock is reduced, and a larger effective action distance of acid liquor can be obtained by the acidification of foam acid.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The nitrogen foam water control and plugging agent is characterized by being prepared from the following raw materials:
the raw materials comprise the following components in percentage by weight: 15-35% of acid liquor, 0.4-0.6% of foaming agent, 0.6-0.8% of foam stabilizer, 0.9-1.3% of corrosion inhibitor, 0.5-1% of calcium aluminate hydrate, 0.5-1% of sodium lignosulfonate, 2-3% of oil-soluble resin particles, 3-5% of gel, 1-2% of carboxymethyl cellulose, 0.5-1.5% of nano silicon dioxide, 1.5-2.5% of dimethyl diallyl ammonium chloride, 0.4-0.7% of stabilizer and 46.7-72.6% of nitrogen;
the acid solution is one or more of perchloric acid, hydroiodic acid, sulfuric acid, hydrobromic acid, hydrochloric acid, nitric acid, iodic acid, hydrogen fluoride, oxalic acid, sulfurous acid, phosphoric acid, pyruvic acid, nitrous acid, carbonic acid, citric acid, hydrofluoric acid, malic acid, gluconic acid, formic acid, lactic acid, benzoic acid, acrylic acid, acetic acid, propionic acid, stearic acid, hydrosulfuric acid, hypochloric acid and boric acid;
the water shutoff agent is a foamy acidic substance formed by introducing nitrogen into acid liquor.
2. The nitrogen foam water control and shutoff agent of claim 1, wherein the stabilizer is an iron ion stabilizer.
3. The nitrogen foam water control shutoff agent of claim 1 wherein said corrosion inhibitor is any one or a mixture of chromate, nitrite, silicate, molybdate, phosphinocarboxylic acid, thiobenzothiazole, benzotriazole and polyaspartic acid.
4. The nitrogen foam water control and shutoff agent of claim 1, wherein the blowing agent is EL-23.
5. The nitrogen foam water control and shutoff agent of claim 1, wherein the foam stabilizer is any one of polyacrylamide, polyvinyl alcohol, protein and polypeptide.
6. The use method of the nitrogen foam water control and shutoff agent is characterized by comprising the following steps:
step one, mixing raw materials: adding acid liquor into a horizontal stirrer, sequentially adding gel, carboxymethyl cellulose and dimethyl diallyl ammonium chloride into the horizontal stirrer, stirring for 45-55min at the rotation speed of 120-;
step two, tripping out the underground production pipe column;
thirdly, discharging the oil pipe to the bottom boundary of the oil layer, injecting nitrogen into the acid liquor, and mixing and reacting the acid liquor and the nitrogen to form a pre-foam section, a pre-foam acid, a main foam acid and a foam displacement liquid;
extruding into a front foam section;
step five, forward extruding pre-foaming acid;
step six, forward extruding main body foam acid;
and seventhly, placing foam displacement liquid after forward extrusion, closing the well, reacting for 2.5-3.5 days, discharging and discharging residual acid.
7. The method of claim 1, wherein the nitrogen foam water controlling and plugging agent is used in the third step at 1000-1500m3Injecting nitrogen into the acid liquor at the discharge of/h, wherein the injection time is 35-45 min.
8. The use method of the nitrogen foam water control and shutoff agent of claim 6, wherein the pre-foaming section is 25-35% of the upper layer of the foaming section after the mixing reaction of nitrogen and acid liquor;
the preposed foam acid is 15-25% of the upper layer of the acid liquid section after the mixing reaction of the nitrogen and the acid liquid;
the main foam section is the rest part after nitrogen and acid liquor are mixed and react and then are extruded out of the preposed foam acid;
the foam displacement liquid is the rest part after nitrogen and acid liquid are mixed and react and then are extruded out of the main body foam section.
9. The application of the nitrogen foam water control water shutoff agent is characterized in that the water shutoff agent is used for acidizing construction of large-section carbonate and sandstone reservoirs, reservoirs with difficult control of filtration, low-pressure, low-permeability or water-sensitive reservoirs and reservoirs with oil saturation of more than 50 percent.
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