CN105586024A - Profile control and water shutoff agent for high-temperature hypersalinity oil reservoir and profile control and water shutoff method - Google Patents
Profile control and water shutoff agent for high-temperature hypersalinity oil reservoir and profile control and water shutoff method Download PDFInfo
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- CN105586024A CN105586024A CN201410575761.XA CN201410575761A CN105586024A CN 105586024 A CN105586024 A CN 105586024A CN 201410575761 A CN201410575761 A CN 201410575761A CN 105586024 A CN105586024 A CN 105586024A
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims description 27
- 229920000642 polymer Polymers 0.000 claims abstract description 39
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 36
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 36
- 239000010954 inorganic particle Substances 0.000 claims abstract description 35
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 32
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 claims description 6
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- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 4
- 229960004011 methenamine Drugs 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
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Abstract
The invention discloses a profile control and plugging agent for profile control and water plugging of a high-temperature and hypersalinity oil reservoir, which comprises the following raw materials in percentage by weight: 0.3-0.6% of hydrolyzed polyacrylamide, 0.1-0.2% of cross-linking agent, 0.1-0.2% of stabilizing agent, 3.2-4.0% of inorganic particle inducer and 95-96.3% of water containing calcium ions. The hydrolyzed polyacrylamide in the raw material of the profile control agent can generate a crosslinking reaction under the action of a crosslinking agent and a stabilizing agent to form polymer gel, and the polymer gel has better salt resistance; the inorganic particle inducer can react with calcium ions to form inorganic particles, and has high temperature resistance. The plugging agent consisting of the polymer gel and the inorganic particles is inorganic/organic composite gel, and has higher plugging strength and long-term stability under the conditions of high temperature and high salinity.
Description
Technical field
The present invention relates to oil field development field, stifled in particular to a kind of tune for high temperature and high salinity reservoir profile water blockoffAgent and profile control and water shutoff method.
Background technology
In the development process in oil field, because formation fluid mobility difference, Reservoir Heterogeneity and long-period water drive cause non-The reasons such as the further aggravation of homogenieity form current advantage passage in stratum, cause oil well premature water breakthrough or water logging,Water drive poor efficiency or invalid circulation. Have a strong impact on waterflooding development effect, thereby affect the recovery ratio in oil field.
For addressing the above problem, the profile control and water plugging technology of oil reservoir has progressively obtained paying attention to and development in oil field development. Profile control and water pluggingBe by shutoff high permeability zone, improve the sweep efficiency of injected water, reach the object that improves recovery ratio. Profile control and water plugging is as oneImprove waterflooding development effect, realize the important technical of oil reservoir stable yields, the high water cut oil field application of succeeding at home and abroad.Chemical plugging agent for well profile modification is called profile control agent, is called water shutoff agent for the chemical plugging agent of oilwell water shutoff. Both can be used forWell profile modification also can be referred to as plugging agent with the chemical agent of oilwell water shutoff. Chemistry plugging agent often plays the success or failure of profile control and water pluggingDecisive action. Concerning oil field development, particularly thorny Oil/gas Well in interlayer and layer, needs to adopt the change with high selectivityLearn plugging agent. Selective plugging agent will comprise the advantage of following two aspects: the one, there is good selective blocking outlet capacity; The 2nd,The not stifled oil of the best water blockoff of selective water shutoff agent is little to oil flow resistance. Some clays in the market, cement are main inorganic particulateThere are problems in grain water shutoff agent, is mainly manifested in the poor selectivity to profit, and injury is in various degree caused in stratum.Gel-like chemistry plugging agent has the effect of selective profile control and water blockoff, aspect oil reservoir deep adjustment intake profile, is progressively obtainingPay attention to and development.
But, for the high temperature and high salinity oil reservoir of Tarim Oilfield, Zhongyuan Oil Field, Qinghai Oil Field and North China Oilfield, due to oftenThere is the shortcomings such as temperature-resistant anti-salt poor performance, the work measure term of validity be short, water and oil control weak effect in the plugging agent of rule. Therefore, needA kind of plugging agent that is applicable to high temperature and high salinity reservoir profile water blockoff.
Summary of the invention
The present invention aims to provide a kind of plugging agent and profile control and water shutoff method for high temperature and high salinity reservoir profile water blockoff, to solvePlugging agent temperature-resistant anti-salt poor performance in prior art, is not suitable for the problem of high temperature and high salinity reservoir profile water blockoff.
To achieve these goals, according to an aspect of the present invention, provide a kind of stifled for high temperature and high salinity reservoir profileThe plugging agent of water, it is percentage composition meter by weight, and plugging agent comprises following raw material:
0.3～0.6% hydrolyzed polyacrylamide, 0.1～0.2% crosslinking agent, 0.1～0.2% stabilizing agent, 3.2～4.0% inorganic particulateThe water of grain derivant 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 or more in methenamine, formaldehyde and paraformaldehyde; And stabilizing agent is benzeneOne or more in phenol, resorcinol and hydroquinones.
Further, above-mentioned crosslinking agent is paraformaldehyde; And/or stabilizing agent is hydroquinones.
Further, above-mentioned inorganic particle derivant is the soluble-salt containing carbonate.
Further, above-mentioned inorganic particle derivant is sodium carbonate.
According to a further aspect in the invention, also provide a kind of profile control and water shutoff method of high temperature and high salinity oil reservoir, it is on adoptingThe plugging agent of stating carries out profile control and water plugging to high temperature and high salinity oil reservoir.
Further, above-mentioned profile control and water shutoff method, comprises the following steps:
Prepare the mixed solution of the water of hydrolyzed polyacrylamide, crosslinking agent, stabilizing agent, inorganic particle derivant and calcium ions;
Mixed solution is injected to the stratum that needs profile control and water plugging, make mixed solution, under formation temperature, cross-linking reaction occur, formPlugging agent is to produce profile control and water plugging effect.
Further, the above-mentioned step of preparing mixed solution comprises:
Hydrolyzed polyacrylamide is added in the water of calcium ions, form polymer solution;
Crosslinking agent and stabilizing agent are added in polymer solution, form transition solution; And
Inorganic particle derivant is added in transition solution, form mixed solution.
Further, formation temperature is 80～120 DEG C.
Apply plugging agent and the profile control and water shutoff method for high temperature and high salinity reservoir profile water blockoff of the present invention, provided by the present inventionAbove-mentioned plugging agent, can under the effect of crosslinking agent and stabilizing agent, there is cross-linking reaction in the hydrolyzed polyacrylamide in its raw material,Form polymer gel, this polymer gel has good anti-salt property; Meanwhile, the inorganic particle derivant energy in its raw materialEnough and calcium ion reaction formation inorganic particle, it has higher temperature tolerance, therefore with common group of polymer gel and inorganic particleThe plugging agent becoming is inorganic/organic composite gel, possesses high temperature resistant and anti-salt property simultaneously, makes this plugging agent be more suitable for heightTemperature high salinity reservoirs was profile control and water plugging has higher plugging strength and long-time stability under the condition of high temperature and high salinity.
Detailed description of the invention
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.Describe the present invention in detail below in conjunction with embodiment.
Introduce as background technology part, there is temperature-resistant anti-salt poor performance in the plugging agent of oil reservoir at present, is not suitable for high temperature highThe problem of salinity reservoir profile water blockoff. In order to address this problem, it is a kind of for high temperature high mineralization that inventor providesThe plugging agent of degree reservoir profile water blockoff, percentage composition meter by weight, above-mentioned plugging agent comprises following raw material: 0.3～0.6% hydrolysis is poly-Acrylamide, 0.1～0.2% crosslinking agent, 0.1～0.2% stabilizing agent, 3.2～4.0% inorganic particle derivant and 95～96.3%The water of calcium ions.
Above-mentioned plugging agent provided by the present invention, the hydrolyzed polyacrylamide in its raw material can be in the effect of crosslinking agent and stabilizing agentLower generation cross-linking reaction, forms polymer gel. This polymer gel has good anti-salt property. Meanwhile, in its raw materialInorganic particle derivant can form inorganic particle with calcium ion reaction. Tune with polymer gel and the common composition of inorganic particle is stifledAgent is inorganic/organic composite gel, and it has higher temperature-resistant anti-salt. Possess high temperature resistant anti-salt property simultaneously, make this tune stifledAgent is more suitable for high temperature and high salinity reservoir profile water blockoff, has higher plugging strength and length under the condition of high temperature and high salinityPhase stability.
In the water of above-mentioned calcium ions, as long as contain calcium ion, just can under the effect of inorganic particle derivant, form inorganic particulateGrain. One preferred embodiment in, in the water of calcium ions, the concentration of calcium ion is 12000～15000mg/L.
It should be noted that, above-mentioned plugging agent, except above raw material composition, can also comprise that other raw material components are as thiocarbamide etc.,As long as contain said components, just can improve the temperature-resistant anti-salt performance of plugging agent in high temperature and high salinity reservoir profile water blockoff.
Above-mentioned plugging agent provided by the present invention, the water of its raw material calcium ions can carry out independent allotment, as long as can be by calciumIon is introduced plugging agent and is reacted generation inorganic particle with inorganic particle derivant. One preferred embodiment in,The water of calcium ions is the output water of high temperature and high salinity oil reservoir.
It is higher that above-mentioned " high temperature and high salinity oil reservoir " refers to formation temperature, the oil reservoir that salinity is higher. Its formation temperature is commonBe greater than 80 DEG C, salinity is greater than 20000mg/L conventionally. The output water of high temperature and high salinity oil reservoir, its salinity is also higher, spyIt not the calcium ion that contains higher concentration. Above-mentioned plugging agent provided by the present invention, directly adopts the high temperature containing high concentration calcium ionThe output water preparation of high salinity reservoirs was, has saved clear water freight, is conducive to the returning of output water of high temperature and high salinity oil reservoirNote, reduces energy resource consumption.
Above-mentioned plugging agent provided by the present invention, adopts conventional crosslinking agent and the stabilizing agent of those skilled in the art, as long as itsCan make hydrolyzed polyacrylamide carry out cross-linking reaction. One preferred embodiment in, above-mentioned crosslinking agent comprises but notBe limited to one or more in methenamine, formaldehyde and paraformaldehyde; And stabilizing agent comprises but is not limited to phenol, resorcinolAnd one or more in hydroquinones.
Select above-mentioned crosslinking agent and stabilizing agent, the conversion ratio of hydrolyzed polyacrylamide cross-linking reaction is higher. The polymer gel obtainingAlso there is higher plugging strength and stability. Meanwhile, adopt aforementioned stable agent can in polymer gel, introduce phenyl ring, fromAnd make polymer gel there is higher resistance to elevated temperatures. One more preferred embodiment in, above-mentioned crosslinking agent is polyFormaldehyde; And/or aforementioned stable agent is hydroquinones.
For methenamine, the price of paraformaldehyde is lower; For formaldehyde, paraformaldehyde has lower wavingSend out excitant, transport and site operation are safer convenient. On this basis, select paraformaldehyde as crosslinking agent, be conducive toReduce the profile control and water plugging cost of oil reservoir, also help the security and the operability that improve profile control and water plugging.
Phenol is acicular crystal state at normal temperatures, and industrial phenol is solid state in metal bucket, and when use, must heat could be fromIn the bucket of bore 4cm, take out. And phenol has pungent taste and certain corrosivity, therefore at the scene in use procedureComparatively inconvenience. The activity of resorcinol is high, and under high temperature, plastic is too fast. Select hydroquinones as stabilizing agent, be conducive to improve and adjustCut open security and the operability of water blockoff. Meanwhile, be conducive to mate gelation rate and the operation rate of plugging agent.
In addition, select paraformaldehyde as crosslinking agent, hydroquinones is during as stabilizing agent, the colloidal sol (mixing before not reactingThing) in hydroquinones and paraformaldehyde at high temperature can react and produce phenolic resins intermediate. Then, in the middle of phenolic resinsCan there is cross-linking reaction and form the gel with three-dimensional structure in body and hydrolyzed polyacrylamide. The gel of this three-dimensional structure hasHigher plugging strength. And after in the gel of inorganic particle distribution in three-dimensional structure, formation inorganic/organic composite gel rubber systemUnder high temperature and high salinity condition, can keep higher long-time stability.
Above-mentioned plugging agent provided by the present invention, as long as the inorganic particle derivant that its raw material adopts can impel in plugging agent formsInorganic particle. One preferred embodiment in, above-mentioned inorganic particle derivant is the soluble-salt containing carbonate. CarbonAcid ion can react with the calcium ion in system and form calcium carbonate granule. More preferably, for the consideration reducing costs, onStating inorganic particle derivant is sodium carbonate.
Above-mentioned plugging agent provided by the present invention, as long as the hydrolyzed polyacrylamide of employing can form polymerization through polymerization crosslinking reactionThing gel. One preferred embodiment in, the molecular weight of said hydrolyzed polyacrylamide is 800 × 104～1500×104; The degree of hydrolysis of hydrolyzed polyacrylamide is 8～12%. The molecular weight of hydrolyzed polyacrylamide and degree of hydrolysis are controlled to above-mentioned modelEnclose, the polymer gel of formation has higher plugging strength and stability concurrently, is more suitable for the profile control as high temperature and high salinity oil reservoirWater-blocking operation.
In addition, according to a further aspect in the invention, also provide a kind of profile control and water shutoff method of high temperature and high salinity oil reservoir, it isAdopt above-mentioned plugging agent to carry out profile control and water plugging to high temperature and high salinity oil reservoir.
Above-mentioned plugging agent provided by the present invention, the hydrolyzed polyacrylamide in its raw material can be in the effect of crosslinking agent and stabilizing agentLower generation cross-linking reaction, forms polymer gel. This polymer gel has good heat resistance. Meanwhile, in its raw materialInorganic particle derivant can form inorganic particle with calcium ion reaction, has higher anti-salt property. With polymer gel and nothingThe plugging agent of the common composition of machine particle is inorganic/organic composite gel, makes this plugging agent stifled for high temperature and high salinity reservoir profileWhen water, under the condition of high temperature and high salinity, there are higher plugging strength and long-time stability.
In above-mentioned profile control and water shutoff method provided by the present invention, can adopt those skilled in the art institute customary way to enter oil reservoirRow profile control and water plugging. One preferred embodiment in, above-mentioned profile control and water shutoff method comprises the following steps: preparation hydrolysis polypropyleneThe mixed solution of the water of acid amides, crosslinking agent, stabilizing agent, inorganic particle derivant and calcium ions; Mixed solution is injected and neededWant in the stratum of profile control and water plugging, make mixed solution, under formation temperature, cross-linking reaction occur, form plugging agent to produce profile control and water pluggingEffect.
Described in above, the formation temperature of " high temperature and high salinity oil reservoir " is higher. By hydrolyzed polyacrylamide, crosslinking agent, stableThe formulated mixed solution of water of agent, inorganic particle derivant and calcium ions injects and needs behind the stratum of profile control and water plugging,Under the effect of formation temperature, the hydrolyzed polyacrylamide in mixed solution can occur former under the effect of crosslinking agent and stabilizing agentPosition cross-linking reaction, forms polymer gel. Meanwhile, inorganic particle derivant and calcium ion react form inorganic particle divideBe dispersed in polymer gel matrix, form organic/inorganic compounding gel plugging agent, the effect of performance profile control and water plugging.
Utilize the geological characteristics of " high temperature and high salinity oil reservoir ", form plugging agent performance profile control at profile control and water plugging operation situ stifledWater effect, the preparation technology that this has simplified plugging agent greatly, has reduced energy consumption. And there is higher practicality and operability.
In above-mentioned profile control and water shutoff method provided by the present invention, those skilled in the art can select concrete preparation hydrolysis polypropyleneThe method of the mixed solution of the water of acid amides, crosslinking agent, stabilizing agent, inorganic particle derivant and calcium ions. Preferred in oneEmbodiment in, the above-mentioned step of preparing mixed solution comprises: hydrolyzed polyacrylamide is added in the water of calcium ions to shapeBecome polymer solution; Crosslinking agent and stabilizing agent are added in polymer solution, form transition solution; Finally inorganic particle is inducedAgent adds in transition solution, forms mixed solution.
In the process of practical operation, after hydrolyzed polyacrylamide being added in the water of calcium ions, fully after slaking, in formationState polymer solution. It is more abundant that slaking can impel hydrolyzed polyacrylamide to dissolve. Under the condition stirring by crosslinking agent and steadyDetermine agent and add in polymer solution, form transition solution. Finally add inorganic particle derivant can make the inorganic particle forming existIn polymer gel, disperse more equably.
Said method provided by the present invention, the formation temperature of " high temperature and high salinity oil reservoir " is only greater than 80 DEG C, just can impelThe mixed solution of the water of said hydrolyzed polyacrylamide, crosslinking agent, stabilizing agent, inorganic particle derivant and calcium ions is at noteEnter occur behind stratum in-situ cross-linked. One preferred embodiment in, in above-mentioned profile control and water shutoff method, formation temperature is80～120℃。
Under the formation temperature of 80～120 DEG C, carry out profile control and water plugging, by said hydrolyzed polyacrylamide, crosslinking agent, stabilizing agent, nothingAfter the mixed solution of the water of machine particle derivant and calcium ions injects, the cross-linking reaction speed of hydrolyzed polyacrylamide is comparatively suitableSuitable, the plugging agent forming has higher water blockoff intensity and long-time stability.
Below in conjunction with specific embodiment, the present invention is described in further detail, these embodiment can not be interpreted as restriction institute of the present inventionClaimed scope.
Embodiment 1 to 4 and comparative example 1 and 2 have been prepared plugging agent, and the high temperature resistant anti-salt property of plugging agent is characterized.The molecular weight of the hydrolysed polyacrylic amides wherein adopting 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:
In the water of above-mentioned calcium ions, add while stirring hydrolyzed polyacrylamide, after slaking, obtain polymer solution; While stirringIn polymer solution, add crosslinking agent and stabilizing agent, rear formation transition solution to be dissolved; In the most backward transition solution, add inorganic particulateGrain derivant, forms mixed solution;
Above-mentioned mixed solution is carried out to cross-linking reaction at 120 DEG C of temperature, form organic/inorganic compounding gel, form plugging agent.
By above-mentioned plugging agent constant temperature 60d at 120 DEG C, colloid is without dehydration phenomenon, and viscosity conservation rate is 75.5%.
Embodiment 2
The composition of raw materials of plugging agent is as follows:
Plugging agent preparation flow is as follows:
In the water of above-mentioned calcium ions, add while stirring hydrolyzed polyacrylamide, after slaking, obtain polymer solution; While stirringIn polymer solution, add crosslinking agent and stabilizing agent, rear formation transition solution to be dissolved; In the most backward transition solution, add inorganic particulateGrain derivant, forms mixed solution;
Above-mentioned mixed solution is carried out to cross-linking reaction at 120 DEG C of temperature, form organic/inorganic compounding gel, form plugging agent.
By above-mentioned plugging agent constant temperature 60d at 120 DEG C, colloid is without dehydration phenomenon, and viscosity conservation rate is 87.0%.
Embodiment 3
The composition of raw materials of plugging agent is as follows:
Plugging agent preparation flow is as follows:
In the water of above-mentioned calcium ions, add while stirring hydrolyzed polyacrylamide, after slaking, obtain polymer solution; While stirringIn polymer solution, add crosslinking agent and stabilizing agent, rear formation transition solution to be dissolved; In the most backward transition solution, add inorganic particulateGrain derivant, forms mixed solution;
Above-mentioned mixed solution is carried out to cross-linking reaction at 120 DEG C of temperature, form organic/inorganic compounding gel, form plugging agent.
By above-mentioned plugging agent constant temperature 60d at 120 DEG C, colloid is without dehydration phenomenon, and viscosity conservation rate is 80.6%.
Embodiment 4
The composition of raw materials of plugging agent is as follows:
Plugging agent preparation flow is as follows:
In the water of above-mentioned calcium ions, add while stirring hydrolyzed polyacrylamide, after slaking, obtain polymer solution; While stirringIn polymer solution, add crosslinking agent and stabilizing agent, rear formation transition solution to be dissolved; In the most backward transition solution, add inorganic particulateGrain derivant, forms mixed solution;
Above-mentioned mixed solution is carried out to cross-linking reaction at 120 DEG C of temperature, form organic/inorganic compounding gel, form plugging agent.
By above-mentioned plugging agent constant temperature 60d at 120 DEG C, colloid is without dehydration phenomenon, and viscosity conservation rate is 83.5%.
Comparative example 1
The composition of raw materials of plugging agent is as follows:
Plugging agent preparation flow is as follows:
In the water of above-mentioned calcium ions, add while stirring hydrolyzed polyacrylamide, after slaking, obtain polymer solution; While stirringIn polymer solution, add crosslinking agent and stabilizing agent, rear formation transition solution to be dissolved; In the most backward transition solution, add inorganic particulateGrain derivant, forms mixed solution;
Above-mentioned mixed solution is carried out to cross-linking reaction at 120 DEG C of temperature, form organic/inorganic compounding gel, form plugging agent.
By above-mentioned plugging agent constant temperature 60d at 120 DEG C, colloid is without dehydration phenomenon, and viscosity conservation rate is 50.6%.
Comparative example 2
The composition of raw materials of plugging agent is as follows:
Plugging agent preparation flow is as follows:
In the water of above-mentioned calcium ions, add while stirring hydrolyzed polyacrylamide, after slaking, obtain polymer solution; While stirringIn polymer solution, add crosslinking agent and stabilizing agent, rear formation transition solution to be dissolved; In the most backward transition solution, add inorganic particulateGrain derivant, forms mixed solution;
Above-mentioned mixed solution is carried out to cross-linking reaction at 120 DEG C of temperature, form organic/inorganic compounding gel, form plugging agent.
By above-mentioned plugging agent at 120 DEG C when constant temperature 20h colloid there is dehydration phenomenon, broken glue when 3d.
In embodiment 5 to 8 and comparative example 3 and 4, simulate the application of plugging agent in profile control and water plugging, and characterized its sealing ratiod.
Embodiment 5
Prepare mixed solution, the formula of employing is with embodiment 1;
Adopt fill out sand tube rock core to evaluate its sealing characteristics, measuring formula is 4.92 μ m in permeability2Shutoff in fill out sand tubeRate. Specific experiment process is as follows:
To grow for 30cm, the fill out sand tube of internal diameter 2.5cm is filled sand grains and is made simulation core. Water drive is initial to surveying it after pressure stabilityPermeability Kwb. In fill out sand tube, inject the mixed solution of 0.5PV, inject subsequently 0.1PV mass fraction and be 0.3% polypropyleneAmide solution replaces, and is finally placed on aging 7d in 120 DEG C of insulating boxs by sealed at both ends fill out sand tube. Under identical injection rateWater drive, to pressure stability, is measured the permeability K after reservoir core plugging againwa, and press formula E=(Kwb-Kwa)×100％/KwbCalculateGo out sealing ratiod.
Experimental result: fill out sand tube reservoir core plugging rate is 91.5%.
Embodiment 6
Prepare mixed solution, the formula of employing is with embodiment 2;
Adopt fill out sand tube rock core to evaluate its sealing characteristics, measuring formula is 5.12 μ m in permeability2Shutoff in fill out sand tubeRate. Specific experiment process is identical with embodiment 5, and difference is that aging temperature is 80 DEG C.
Experimental result: fill out sand tube reservoir core plugging rate is 99.3%.
Embodiment 7
Prepare mixed solution, the formula of employing is with embodiment 3;
Adopt fill out sand tube rock core to evaluate its sealing characteristics, measuring formula is 4.85 μ m in permeability2Shutoff in fill out sand tubeRate. Specific experiment process is identical with embodiment 5.
Experimental result: fill out sand tube reservoir core plugging rate is 96.8%.
Embodiment 8
Prepare mixed solution, the formula of employing is with embodiment 4;
Adopt fill out sand tube rock core to evaluate its sealing characteristics, measuring formula is 5.05 μ m in permeability2Shutoff in fill out sand tubeRate. Specific experiment process is identical with embodiment 5.
Experimental result: fill out sand tube reservoir core plugging rate is 97.6%.
Comparative example 3
Prepare mixed solution, the formula of employing is with comparative example 1;
Adopt fill out sand tube rock core to evaluate its sealing characteristics, measuring formula is 5.15 μ m in permeability2Shutoff in fill out sand tubeRate. Specific experiment process is identical with embodiment 5, and 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
Prepare mixed solution, the formula of employing is with comparative example 1;
Adopt fill out sand tube rock core to evaluate its sealing characteristics, measuring formula is 4.95 μ m in permeability2Shutoff in fill out sand tubeRate. Specific experiment process is identical with embodiment 5, and 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 with describing, can find out, the above embodiments of the present invention have realized following technique effect:
Adopt above-mentioned plugging agent provided by the present invention to carry out profile control and water plugging to high temperature and high salinity oil reservoir, plugging agent has higherTemperature-resistant anti-salt performance, therefore has higher long-time stability. In addition, plugging agent provided by the present invention is at high temperature and high salinityUnder also there is very strong sealing characteristics, can ensure in site operation effectively shutoff high permeability zone.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for those skilled in the art, the present invention can have various modifications and variations. Within the spirit and principles in the present invention all, any amendment of doing, etc.With replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. for a plugging agent for high temperature and high salinity reservoir profile water blockoff, it is characterized in that,
Percentage composition meter by weight, described plugging agent comprises following raw material:
0.3～0.6% hydrolyzed polyacrylamide, 0.1～0.2% crosslinking agent, 0.1～0.2% stabilizing agent, 3.2～4.0%Inorganic particle derivant and the water of 95～96.3% calcium ions.
2. plugging agent according to claim 1, is characterized in that, the water of described calcium ions is described high temperature and high salinity oilThe output water of hiding.
3. plugging agent according to claim 1 and 2, is characterized in that,
Described crosslinking agent is one or more in methenamine, formaldehyde and paraformaldehyde; And
Described stabilizing agent is one or more in phenol, resorcinol and hydroquinones.
4. plugging agent according to claim 3, is characterized in that,
Described crosslinking agent is paraformaldehyde; And/or
Described stabilizing agent is hydroquinones.
5. plugging agent according to claim 1 and 2, is characterized in that, described inorganic particle derivant be containing carbonate canSoluble.
6. plugging agent according to claim 5, is characterized in that, described inorganic particle derivant is sodium carbonate.
7. a profile control and water shutoff method for high temperature and high salinity oil reservoir, is characterized in that, adopts any one institute in claim 1 to 6The plugging agent of stating carries out profile control and water plugging to described high temperature and high salinity oil reservoir.
8. profile control and water shutoff method according to claim 7, is characterized in that, comprises the following steps:
Prepare the mixing of the water of hydrolyzed polyacrylamide, crosslinking agent, stabilizing agent, inorganic particle derivant and calcium ionsSolution;
Described mixed solution is injected to the stratum that needs profile control and water plugging, described mixed solution is handed under formation temperatureConnection reaction, forms described plugging agent to produce profile control and water plugging effect.
9. profile control and water shutoff method according to claim 8, is characterized in that,
The step of preparing described mixed solution comprises:
Described hydrolyzed polyacrylamide is added in the water of described calcium ions, form polymer solution;
Described crosslinking agent and described stabilizing agent are added in described polymer solution, form transition solution;And,
Described inorganic particle derivant is added in described transition solution, form described mixed solution.
10. profile control and water shutoff method according to claim 7, is characterized in that, described formation temperature is 80～120 DEG C.
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