CN105586024B - Plugging agent and profile control and water shutoff method for high temperature and high salinity reservoir profile water blockoff - Google Patents
Plugging agent and profile control and water shutoff method for high temperature and high salinity reservoir profile water blockoff Download PDFInfo
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Abstract
The invention discloses a kind of plugging agents for high temperature and high salinity reservoir profile water blockoff, weight percentage, the plugging agent include following raw material: 0.3~0.6% hydrolyzed polyacrylamide, 0.1~0.2% crosslinking agent, 0.1~0.2% stabilizer, 3.2~4.0% inorganic particle inducer and 95~96.3% calcium ions water.Hydrolyzed polyacrylamide in the plugging agent raw material can crosslink reaction under the action of crosslinking agent and stabilizer, form polymer gel, which has preferable anti-salt property；Inorganic particle inducer can react to form inorganic particle with calcium ion, temperature tolerance with higher.This plugging agent formed with polymer gel and inorganic particle provided by the invention is inorganic/organic composite gel, the plugging agent plugging strength with higher and long-time stability under conditions of high temperature and high salinity.
Description
Technical field
The present invention relates to oil field development fields, are used for high temperature and high salinity reservoir profile water blockoff in particular to one kind
Plugging agent and profile control and water shutoff method.
Background technique
In the development process in oil field, since formation fluid mobility difference, Reservoir Heterogeneity and long-period water drive cause
Heterogeneity such as is further exacerbated by the reasons, forms water flow predominant pathway in the earth formation, leads to oil well premature water breakthrough or water logging, water drive
Inefficient or inefficient cycle.Water flooding effectiveness is seriously affected, to influence the recovery ratio in oil field.
To solve the above problems, the profile control and water plugging technology of oil reservoir is gradually paid attention to and is developed in oil field development.It adjusts
Cuing open water blockoff is to improve the sweep efficiency of injection water by blocking high permeability zone, achievees the purpose that improve recovery ratio.Profile control and water plugging is made
For an improving ecology development effectiveness, the important technical of realization oil reservoir stable yields, at home and abroad high water cut oil field is obtained
Successful application.Chemical plugging agent for well profile modification is known as profile control agent, and the chemical plugging agent for oilwell water shutoff is known as water blockoff
Agent.Can be not only used for well profile modification can also be referred to as plugging agent with the chemical agent of oilwell water shutoff.Chemical plugging agent is to profile control and water plugging
Success or failure often play decisive action.For oil field development, particularly thorny oil/gas well in interlayer and layer, needing to use has
The chemical plugging agent of high selectivity.Selective plugging agent will include following both sides advantage: first is that having good selection
Property water blockoff ability；Second is that the not stifled oil of the best water blockoff of selective water shutoff agent, small to oil flow resistance.Some clays currently on the market,
Inorganic particle water shutoff agent based on cement is mainly manifested in the poor selectivity to grease there are problems, and makes to stratum
At different degrees of injury.Gel-like chemistry plugging agent has the function of selective profile control and water blockoff, adjusts and inhales in oil reservoir deep
Gradually paid attention to and developed in terms of water section.
However, for the high temperature and high salinity oil reservoir of Tarim Oilfield, Zhongyuan Oil Field, Qinghai Oil Field and North China Oilfield, by
In conventional plugging agent there are temperature-resistant anti-salt performances it is poor, work measure validity period is short the disadvantages of, water and oil control effect is poor.Therefore,
Need a kind of plugging agent suitable for high temperature and high salinity reservoir profile water blockoff.
Summary of the invention
The present invention is intended to provide a kind of plugging agent and profile control and water shutoff method for high temperature and high salinity reservoir profile water blockoff,
High temperature and high salinity reservoir profile water blockoff is not suitable for solve the problem of that plugging agent temperature-resistant anti-salt performance is poor in the prior art.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of be used for high temperature and high salinity oil reservoir
The plugging agent of profile control and water plugging, weight percentage, plugging agent include following raw material:
0.3~0.6% hydrolyzed polyacrylamide, 0.1~0.2% crosslinking agent, 0.1~0.2% stabilizer, 3.2
The water of~4.0% inorganic particle inducer and 95~96.3% calcium ions.
Further, the water of above-mentioned calcium ions is the output water of high temperature and high salinity oil reservoir.
Further, above-mentioned crosslinking agent is one of methenamine, formaldehyde and paraformaldehyde or a variety of；And stabilizer
For one of phenol, resorcinol and hydroquinone or a variety of.
Further, above-mentioned crosslinking agent is paraformaldehyde；And/or stabilizer is hydroquinone.
Further, above-mentioned inorganic particle inducer is the soluble-salt containing carbonate.
Further, above-mentioned inorganic particle inducer is sodium carbonate.
According to another aspect of the present invention, a kind of profile control and water shutoff method of high temperature and high salinity oil reservoir is additionally provided, is
Profile control and water plugging is carried out to high temperature and high salinity oil reservoir using above-mentioned plugging agent.
Further, above-mentioned profile control and water shutoff method, comprising the following steps:
Prepare the mixing of the water of hydrolyzed polyacrylamide, crosslinking agent, stabilizer, inorganic particle inducer and calcium ions
Solution；
Mixed solution injection is needed to crosslink mixed solution at the formation temperature instead in the stratum of profile control and water plugging
It answers, forms plugging agent to generate profile control and water plugging effect.
Further, above-mentioned the step of preparing mixed solution, includes:
Hydrolyzed polyacrylamide is added in the water of calcium ions, polymer solution is formed；
Crosslinking agent and stabilizer are added in polymer solution, transition solution is formed；And
Inorganic particle inducer is added in transition solution, mixed solution is formed.
Further, formation temperature is 80~120 DEG C.
Using the plugging agent and profile control and water shutoff method for high temperature and high salinity reservoir profile water blockoff of the invention, the present invention
Provided above-mentioned plugging agent, the hydrolyzed polyacrylamide in raw material can be handed under the action of crosslinking agent and stabilizer
Connection reaction, forms polymer gel, which has preferable anti-salt property；Meanwhile the inorganic particle in raw material
Inducer can react to form inorganic particle with calcium ion, temperature tolerance with higher, therefore with polymer gel and inorganic
The plugging agent that particle collectively constitutes is inorganic/organic composite gel, is provided simultaneously with high temperature resistant and anti-salt property, so that the tune is stifled
Agent is more suitable for high temperature and high salinity reservoir profile water blockoff, under conditions of high temperature and high salinity have higher plugging strength and
Long-time stability.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.Below in conjunction with embodiment, the present invention will be described in detail.
As background technology part is introduced, the plugging agent of oil reservoir is not suitable for there are temperature-resistant anti-salt performance is poor at present
The problem of high temperature and high salinity reservoir profile water blockoff.In order to solve this problem, inventor provides a kind of for height
The plugging agent of warm high salinity reservoirs profile control and water plugging, weight percentage, above-mentioned plugging agent include following raw material: 0.3~
0.6% hydrolyzed polyacrylamide, 0.1~0.2% crosslinking agent, 0.1~0.2% stabilizer, 3.2~4.0% it is inorganic
Particle inducer and 95~96.3% calcium ions water.
Above-mentioned plugging agent provided by the present invention, the hydrolyzed polyacrylamide in raw material can be in crosslinking agent and stabilizer
Under the action of crosslink reaction, form polymer gel.The polymer gel has preferable anti-salt property.Meanwhile it is former
Inorganic particle inducer in material can react to form inorganic particle with calcium ion.With common group of polymer gel and inorganic particle
At plugging agent be inorganic/organic composite gel, heat and salt resistance with higher.It is provided simultaneously with high temperature resistant anti-salt property,
So that the plugging agent is more suitable for high temperature and high salinity reservoir profile water blockoff, have under conditions of high temperature and high salinity higher
Plugging strength and long-time stability.
In the water of above-mentioned calcium ions, as long as containing calcium ion, it will be able to be formed under the action of inorganic particle inducer
Inorganic particle.In a kind of preferred embodiment, the concentration of calcium ion is 12000~15000mg/L in the water of calcium ions.
It should be noted that above-mentioned plugging agent is outer in addition to the above raw material composition, it can also be including other raw material components such as
Thiocarbamide etc., as long as containing said components, it will be able to it is anti-to improve heatproof of the plugging agent in high temperature and high salinity reservoir profile water blockoff
Salt performance.
The water of above-mentioned plugging agent provided by the present invention, raw material calcium ions can be deployed individually, as long as energy
It is enough to carry out calcium ion introducing plugging agent with inorganic particle inducer to react generation inorganic particle.In a kind of preferred implementation
In mode, the water of calcium ions is the output water of high temperature and high salinity oil reservoir.
Above-mentioned " high temperature and high salinity oil reservoir " refers to that formation temperature is higher, the higher oil reservoir of salinity.Its formation temperature
Typically larger than 80 DEG C, salinity is typically larger than 20000mg/L.The output water of high temperature and high salinity oil reservoir, salinity is also higher,
Especially containing the calcium ion of higher concentration.Above-mentioned plugging agent provided by the present invention, directlys adopt containing high concentration calcium ion
The output water of high temperature and high salinity oil reservoir is prepared, and has been saved clear water freight, has been conducive to the output of high temperature and high salinity oil reservoir
The re-injection of water reduces energy consumption.
Above-mentioned plugging agent provided by the present invention, using the common crosslinking agent of those skilled in the art and stabilizer,
As long as it can make hydrolyzed polyacrylamide carry out cross-linking reaction.In a preferred embodiment, above-mentioned crosslinking agent
Including but not limited to one of methenamine, formaldehyde and paraformaldehyde or a variety of；And stabilizer include but is not limited to phenol,
One of resorcinol and hydroquinone are a variety of.
Above-mentioned crosslinking agent and stabilizer are selected, the conversion ratio of hydrolyzed polyacrylamide cross-linking reaction is higher.Obtained polymerization
Object gel also plugging strength with higher and stability.Meanwhile it can be introduced in polymer gel using above stabilizer
Phenyl ring, so that polymer gel has higher high temperature resistance.In one kind more preferably embodiment, above-mentioned crosslinking
Agent is paraformaldehyde；And/or above stabilizer is hydroquinone.
For methenamine, the price of paraformaldehyde is lower；For formaldehyde, paraformaldehyde has lower
Volatilization irritation, transport and site operation it is safer convenient.On this basis, it selects paraformaldehyde as crosslinking agent, has
Conducive to the profile control and water plugging cost for reducing oil reservoir, the safety and operability of profile control and water plugging are also advantageously improved.
Phenol is in acicular crystal state at normal temperature, and industrial phenol is in solid state in metal bucket, and when use must heat
It could be taken out from the bucket of bore 4cm.Moreover, phenol has pungent taste and certain corrosivity, therefore use at the scene
It is more inconvenient in the process.The activity of resorcinol is high, and plastic is too fast under high temperature.It selects hydroquinone as stabilizer, is conducive to
Improve the safety and operability of profile control and water plugging.Meanwhile being conducive to match the gelation rate and operation rate of plugging agent.
In addition, selecting paraformaldehyde as crosslinking agent, when hydroquinone is as stabilizer, colloidal sol is not (before reacting
Mixture) in hydroquinone with paraformaldehyde at high temperature can react production phenolic resin intermediate.Then, phenolic resin
Intermediate can crosslink the gel for reacting and being formed and having three-dimensional structure with hydrolyzed polyacrylamide.This three-dimensional structure is coagulated
Glue has higher plugging strength.And after inorganic particle distribution is in the gel of three-dimensional structure, inorganic/organic composite of formation
Gel rubber system is able to maintain higher long-time stability under the conditions of high temperature and high salinity.
Above-mentioned plugging agent provided by the present invention, as long as the inorganic particle inducer that raw material uses can promote plugging agent
Middle formation inorganic particle.In a preferred embodiment, above-mentioned inorganic particle inducer is containing the solvable of carbonate
Property salt.Carbanion can react to form calcium carbonate granule with the calcium ion in system.It is highly preferred that for cost is reduced
Consider, above-mentioned inorganic particle inducer is sodium carbonate.
Above-mentioned plugging agent provided by the present invention, as long as the hydrolyzed polyacrylamide of use being capable of aggregated cross-linking reaction shape
At polymer gel.In a preferred embodiment, the molecular weight of above-mentioned hydrolyzed polyacrylamide is 800 × 104
~1500 × 104；The degree of hydrolysis of hydrolyzed polyacrylamide is 8~12%.By the molecular weight and degree of hydrolysis of hydrolyzed polyacrylamide
In above range, the polymer gel of formation has both higher plugging strength and stability for control, is more suitable for being used as the high mine of high temperature
The profile control and water plugging operation of change degree oil reservoir.
In addition, according to another aspect of the present invention, a kind of profile control and water shutoff method of high temperature and high salinity oil reservoir is additionally provided,
It is to carry out profile control and water plugging to high temperature and high salinity oil reservoir using above-mentioned plugging agent.
Above-mentioned plugging agent provided by the present invention, the hydrolyzed polyacrylamide in raw material can be in crosslinking agent and stabilizer
Under the action of crosslink reaction, form polymer gel.The polymer gel has preferable heat resistance.Meanwhile it is former
Inorganic particle inducer in material can react to form inorganic particle with calcium ion, anti-salt property with higher.With polymer
The plugging agent that gel and inorganic particle collectively constitute is inorganic/organic composite gel, so that the plugging agent is used for high temperature high mineralization
When spending reservoir profile water blockoff, there are higher plugging strength and long-time stability under conditions of high temperature and high salinity.
In above-mentioned profile control and water shutoff method provided by the present invention, those skilled in the art institute customary way pair can be used
Oil reservoir carries out profile control and water plugging.In a preferred embodiment, above-mentioned profile control and water shutoff method is the following steps are included: preparation hydrolysis
Polyacrylamide, crosslinking agent, stabilizer, inorganic particle inducer and calcium ions water mixed solution；By mixed solution
Injection needs to make mixed solution crosslink reaction at the formation temperature in the stratum of profile control and water plugging, forms plugging agent to generate
Profile control and water plugging effect.
By described previously, the formation temperature of " high temperature and high salinity oil reservoir " is higher.By hydrolyzed polyacrylamide, crosslinking agent,
The mixed solution injection that the water of stabilizer, inorganic particle inducer and calcium ions is formulated needs the stratum of profile control and water plugging
In after, under the action of formation temperature, the hydrolyzed polyacrylamide in mixed solution can be in the effect of crosslinking agent and stabilizer
It is lower to be cross-linked in situ reaction, form polymer gel.Meanwhile inorganic particle inducer and calcium ion react the nothing to be formed
Machine particle is dispersed in polymer gel-matrix, forms organic/inorganic compounding Gel profile control agent, plays profile control and water plugging effect.
Plugging agent is formed in situ in profile control and water plugging operation and plays tune for the geological characteristics for utilizing " high temperature and high salinity oil reservoir "
Plugging function is cutd open, which greatly simplifies the preparation processes of plugging agent, reduce energy consumption.And it practicability with higher and can operate
Property.
In above-mentioned profile control and water shutoff method provided by the present invention, those skilled in the art can choose specific prepare and hydrolyze
Polyacrylamide, crosslinking agent, stabilizer, inorganic particle inducer and calcium ions water mixed solution method.One
In kind preferred embodiment, above-mentioned the step of preparing mixed solution includes: that hydrolyzed polyacrylamide is added to calcium ions
In water, polymer solution is formed；Crosslinking agent and stabilizer are added in polymer solution, transition solution is formed；It finally will be inorganic
Particle inducer adds in transition solution, forms mixed solution.
During practical operation, after hydrolyzed polyacrylamide is added in the water of calcium ions, sufficiently after curing, shape
At above-mentioned polymer solution.Curing can promote hydrolyzed polyacrylamide dissolution more abundant.It under stirring conditions will crosslinking
Agent and stabilizer add in polymer solution, form transition solution.The nothing to be formed can be made by being eventually adding inorganic particle inducer
Machine particle spreads more evenly across in polymer gel.
The above method provided by the present invention, " high temperature and high salinity oil reservoir " if formation temperature be greater than 80 DEG C, energy
Enough promote the mixing of the water of above-mentioned hydrolyzed polyacrylamide, crosslinking agent, stabilizer, inorganic particle inducer and calcium ions molten
Liquid is cross-linked in situ after injecting stratum.In a preferred embodiment, in above-mentioned profile control and water shutoff method, formation temperature
It is 80~120 DEG C.
Profile control and water plugging is carried out under 80~120 DEG C of formation temperature, by above-mentioned hydrolyzed polyacrylamide, crosslinking agent, stabilization
After the mixed solution injection of the water of agent, inorganic particle inducer and calcium ions, the cross-linking reaction speed of hydrolyzed polyacrylamide
Rate is more suitable for being formed by plugging agent with higher water blockoff intensity and long-time stability.
Below in conjunction with specific embodiment, present invention is further described in detail, these embodiments should not be understood as limitation originally
Invent range claimed.
Embodiment 1 to 4 and comparative example 1 and 2 are prepared for plugging agent, and have carried out table to the high temperature resistant anti-salt property of plugging agent
Sign.The molecular weight of the hydrolysed polyacrylic amides wherein used is 1100 × 104, degree of hydrolysis is 11%.
Embodiment 1
The composition of raw materials of plugging agent is as follows:
Plugging agent preparation flow is as follows:
Hydrolyzed polyacrylamide is added while stirring in the water of above-mentioned calcium ions, obtains polymer solution after curing；
Crosslinking agent and stabilizer is added into polymer solution while stirring, forms transition solution after to be dissolved；Finally to transition solution
Middle addition inorganic particle inducer forms mixed solution；
Above-mentioned mixed solution is subjected to cross-linking reaction at a temperature of 120 DEG C, organic/inorganic compounding gel is formed, that is, is formed
Plugging agent.
By above-mentioned plugging agent at 120 DEG C constant temperature 60d, colloid is without dehydrating phenomena, viscosity retention 75.5%.
Embodiment 2
The composition of raw materials of plugging agent is as follows:
Plugging agent preparation flow is as follows:
Hydrolyzed polyacrylamide is added while stirring in the water of above-mentioned calcium ions, obtains polymer solution after curing；
Crosslinking agent and stabilizer is added into polymer solution while stirring, forms transition solution after to be dissolved；Finally to transition solution
Middle addition inorganic particle inducer forms mixed solution；
Above-mentioned mixed solution is subjected to cross-linking reaction at a temperature of 120 DEG C, organic/inorganic compounding gel is formed, that is, is formed
Plugging agent.
By above-mentioned plugging agent at 120 DEG C constant temperature 60d, colloid is without dehydrating phenomena, viscosity retention 87.0%.
Embodiment 3
The composition of raw materials of plugging agent is as follows:
Plugging agent preparation flow is as follows:
Hydrolyzed polyacrylamide is added while stirring in the water of above-mentioned calcium ions, obtains polymer solution after curing；
Crosslinking agent and stabilizer is added into polymer solution while stirring, forms transition solution after to be dissolved；Finally to transition solution
Middle addition inorganic particle inducer forms mixed solution；
Above-mentioned mixed solution is subjected to cross-linking reaction at a temperature of 120 DEG C, organic/inorganic compounding gel is formed, that is, is formed
Plugging agent.
By above-mentioned plugging agent at 120 DEG C constant temperature 60d, colloid is without dehydrating phenomena, viscosity retention 80.6%.
Embodiment 4
The composition of raw materials of plugging agent is as follows:
Plugging agent preparation flow is as follows:
Hydrolyzed polyacrylamide is added while stirring in the water of above-mentioned calcium ions, obtains polymer solution after curing；
Crosslinking agent and stabilizer is added into polymer solution while stirring, forms transition solution after to be dissolved；Finally to transition solution
Middle addition inorganic particle inducer forms mixed solution；
Above-mentioned mixed solution is subjected to cross-linking reaction at a temperature of 120 DEG C, organic/inorganic compounding gel is formed, that is, is formed
Plugging agent.
By above-mentioned plugging agent at 120 DEG C constant temperature 60d, colloid is without dehydrating phenomena, viscosity retention 83.5%.
Comparative example 1
The composition of raw materials of plugging agent is as follows:
Plugging agent preparation flow is as follows:
Hydrolyzed polyacrylamide is added while stirring in the water of above-mentioned calcium ions, obtains polymer solution after curing；
Crosslinking agent and stabilizer is added into polymer solution while stirring, forms transition solution after to be dissolved；Finally to transition solution
Middle addition inorganic particle inducer forms mixed solution；
Above-mentioned mixed solution is subjected to cross-linking reaction at a temperature of 120 DEG C, organic/inorganic compounding gel is formed, that is, is formed
Plugging agent.
By above-mentioned plugging agent at 120 DEG C constant temperature 60d, colloid is without dehydrating phenomena, viscosity retention 50.6%.
Comparative example 2
The composition of raw materials of plugging agent is as follows:
Plugging agent preparation flow is as follows:
Hydrolyzed polyacrylamide is added while stirring in the water of above-mentioned calcium ions, obtains polymer solution after curing；
Crosslinking agent and stabilizer is added into polymer solution while stirring, forms transition solution after to be dissolved；Finally to transition solution
Middle addition inorganic particle inducer forms mixed solution；
Above-mentioned mixed solution is subjected to cross-linking reaction at a temperature of 120 DEG C, organic/inorganic compounding gel is formed, that is, is formed
Plugging agent.
By above-mentioned plugging agent, there is dehydrating phenomena in colloid when constant temperature 20h at 120 DEG C, when 3d broken glue.
Application of the plugging agent in profile control and water plugging is simulated in embodiment 5 to 8 and comparative example 3 and 4, and characterizes its closure
Rate.
Embodiment 5
Mixed solution is prepared, the formula of use is the same as embodiment 1；
Its sealing characteristics is evaluated using fill out sand tube rock core, measurement formula is 4.92 μm in permeability2In fill out sand tube
Sealing ratiod.Specific experiment process is as follows:
Simulation core is made in the fill out sand tube filling sand grains of a length of 30cm, internal diameter 2.5cm.Water drive surveys it after stablizing to pressure
Original permeability Kwb.The mixed solution that 0.5PV is injected in fill out sand tube is subsequently injected into poly- third that 0.1PV mass fraction is 0.3%
Acrylamide solution is replaced, and the sealing of fill out sand tube both ends is finally placed on aging 7d in 120 DEG C of insulating boxs.Identical injection rate
Under again water drive to pressure stablize, measure reservoir core plugging after permeability Kwa, and press formula E=(Kwb-Kwa) × 100%/KwbMeter
Calculate sealing ratiod.
Experimental result: fill out sand tube reservoir core plugging rate is 91.5%.
Embodiment 6
Mixed solution is prepared, the formula of use is the same as embodiment 2；
Its sealing characteristics is evaluated using fill out sand tube rock core, measurement formula is 5.12 μm in permeability2In fill out sand tube
Sealing ratiod.Specific experiment process is same as Example 5, the difference is that aging temperature is 80 DEG C.
Experimental result: fill out sand tube reservoir core plugging rate is 99.3%.
Embodiment 7
Mixed solution is prepared, the formula of use is the same as embodiment 3；
Its sealing characteristics is evaluated using fill out sand tube rock core, measurement formula is 4.85 μm in permeability2In fill out sand tube
Sealing ratiod.Specific experiment process is same as Example 5.
Experimental result: fill out sand tube reservoir core plugging rate is 96.8%.
Embodiment 8
Mixed solution is prepared, the formula of use is the same as embodiment 4；
Its sealing characteristics is evaluated using fill out sand tube rock core, measurement formula is 5.05 μm in permeability2In fill out sand tube
Sealing ratiod.Specific experiment process is same as Example 5.
Experimental result: fill out sand tube reservoir core plugging rate is 97.6%.
Comparative example 3
Mixed solution is prepared, the formula of use is the same as comparative example 1；
Its sealing characteristics is evaluated using fill out sand tube rock core, measurement formula is 5.15 μm in permeability2In fill out sand tube
Sealing ratiod.Specific experiment process is same as Example 5, the difference is that aging temperature is 90 DEG C.
Experimental result: fill out sand tube reservoir core plugging rate is 71.5%.
Comparative example 4
Mixed solution is prepared, the formula of use is the same as comparative example 1；
Its sealing characteristics is evaluated using fill out sand tube rock core, measurement formula is 4.95 μm in permeability2In fill out sand tube
Sealing ratiod.Specific experiment process is same as Example 5, the difference is that aging temperature is 150 DEG C.
Experimental result: fill out sand tube reservoir core plugging rate is 40.6%.
From above data and description, it can be seen that the above embodiments of the present invention realized the following chievements:
Profile control and water plugging is carried out to high temperature and high salinity oil reservoir using above-mentioned plugging agent provided by the present invention, plugging agent has
Higher temperature-resistant anti-salt performance, therefore long-time stability with higher.In addition, plugging agent provided by the present invention is in high temperature height
Also there is very strong sealing characteristics under salinity, can guarantee effectively to block high permeability zone in site operation.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of plugging agent for high temperature and high salinity reservoir profile water blockoff, which is characterized in that
Weight percentage, the plugging agent include following raw material:
0.3~0.6% hydrolyzed polyacrylamide, 0.1~0.2% crosslinking agent, 0.1~0.2% stabilizer, 3.2~
The water of 4.0% inorganic particle inducer and 95~96.3% calcium ions；The crosslinking agent is paraformaldehyde, described steady
Determining agent is hydroquinone, and the inorganic particle inducer is sodium carbonate.
2. plugging agent according to claim 1, which is characterized in that the water of the calcium ions is the high temperature and high salinity
The output water of oil reservoir.
3. a kind of profile control and water shutoff method of high temperature and high salinity oil reservoir, which is characterized in that use tune of any of claims 1 or 2
Blocking agent carries out profile control and water plugging to the high temperature and high salinity oil reservoir.
4. profile control and water shutoff method according to claim 3, which comprises the following steps:
The mixing for preparing the water of hydrolyzed polyacrylamide, crosslinking agent, stabilizer, inorganic particle inducer and calcium ions is molten
Liquid；
Mixed solution injection is needed to crosslink the mixed solution at the formation temperature in the stratum of profile control and water plugging
Reaction forms the plugging agent to generate profile control and water plugging effect.
5. profile control and water shutoff method according to claim 4, which is characterized in that
The step of preparing the mixed solution include:
The hydrolyzed polyacrylamide is added in the water of the calcium ions, forms polymer solution；
The crosslinking agent and the stabilizer are added in the polymer solution, transition solution is formed；And
The inorganic particle inducer is added in the transition solution, the mixed solution is formed.
6. profile control and water shutoff method according to claim 3, which is characterized in that the formation temperature is 80~120 DEG C.
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