CN108166959A - It is a kind of to prevent swollen retarded acidizing method for the preposition of glutenite oil reservoir - Google Patents
It is a kind of to prevent swollen retarded acidizing method for the preposition of glutenite oil reservoir Download PDFInfo
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- CN108166959A CN108166959A CN201611120202.5A CN201611120202A CN108166959A CN 108166959 A CN108166959 A CN 108166959A CN 201611120202 A CN201611120202 A CN 201611120202A CN 108166959 A CN108166959 A CN 108166959A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
Abstract
Prevent swollen retarded acidizing method for the preposition of glutenite oil reservoir the invention discloses a kind of, include the following steps：（1）The pickling borehole wall：Anti-clayswelling agent and mass concentration are injected into oil reservoir for 10%~15% hydrochloric acid, after injection, reaction time 2h~4h；（2）Main body is acidified：1. anti-clayswelling agent is injected into oil reservoir and 2. gently with chloro acid or mixed solution；After injection, the reaction time is 3h~5h；（3）After pad and displacement fluid：After pad and displacement fluid are implanted sequentially into oil reservoir；After injection, the reaction time is 3h~5h；（4）Raffinate returns row；（5）Heating sucker rod pumping is recovered the oil.The method of the present invention, by substep to glutenite low permeability pay operation, it can effectively inhibit strong retraction and speed quick effect of the glutenite oil reservoir in transformation and recovery process, effectively be acidified nearly well band oil reservoir, the recovery ratio of glutenite oil reservoir is effectively improved, improves daily flow.
Description
Technical field
The present invention relates to one kind to be directed to glutenite oil reservoir【Containing carbonate cementations, clays such as (iron) calcite, (iron) dolomites
Content is high】It is preposition prevent swollen retarded acidizing method, belong to the exploration formation testing of glutenite oil reservoir and exploitation field.
Background technology
Sand-conglomerate body has the characteristics that thickness is big, inside story anisotropism is strong as the oil and gas reservoir that terrestrial lake basin deposits.Closely
Nian Lai, Shengli Oil Field are found that using northern zone of Dongying Sag sand-conglomerate body as large quantities of sandy conglomerate bodies such as representative, exploration for many years
Formation testing pilot production and exploitation effect prove that fractured well initial production is high, and as water-sensitive, the quick degree of speed are aggravated, oil well output is passed rapidly
Subtract, cause reservoir recovery low.And existing acidification technique ignores the sensitivity effects of glutenite acid treatment of oil formation operation process,
Still follow conventional lines Reservoir Acidization technique, and injury caused by without fundamentally inhibiting water-sensitive and the quick oil reservoir glutenite of speed causes
It is low to be acidified success rate.Therefore, for hypotonic or even special hypotonic glutenite oil reservoir, it is necessary to according to the fast quick and water-sensitive of Reservoir Minerals
Feature effectively inhibits water-sensitive and fast quick influence in entire acidification transformation operation process, can be only achieved acidification dredging reservoir
Target, this is glutenite acid treatment of oil formation transformation successfully crucial and difficult point.It is directed to terrestrial facies gravel shale oil not yet in external at present
The preposition of layer prevents swollen retarded acidizing technology.
Chinese patent application CN101255789A discloses a kind of acidification method for removing blockage of oil well, mainly in hyposmosis
Oil well, the purpose of acidification, which mainly releases, to be blocked, while improve the permeability of hyposmosis potentiality layer as far as possible, improves oil well production
Amount.Its technical solution is：Liquid gas is injected as energization slug, the liquid gas to target zone before traditional acidizing treatment
Body is liquid nitrogen or liquid carbon dioxide, and injection rate is preferably 1.2 cubic metres per 1~1.5 cubic metre of rice bran oil layer, injection rate
For 100~250L/min, preferably 200L/min.The patent application is the method for removing blockage for hyposmosis oil well, not in
Hypertonic sandstone oil reservoir water injection well.
Article《Glutenite thick oil pay retarded acid Acidizing Technology is studied and application》(it is published in 2001,《Henan oil》),
It is main describe for Henan Oil Field glutenite thick oil pay ultra-high water cut stage Development characteristics and conventional acidulation treatment radius it is small, repeat
The poor situation of acidizing effect is had developed with organic acid and the fluorine-containing salts retarded acid acid fluid systems of HS as main component -12,
And mating mechanical subdivision acidification technique and work-in-progress control technique.The technology is swollen in the chance water for clay mineral contained by glutenite
Without proposing effective measures in terms of swollen blocking pore throat, it can not solve the problems, such as that how quick property glutenite oil reservoir is effectively acidified.
Invention content
For the above-mentioned prior art, and swelling wall rock content strong for glutenite oil reservoir carbonate cementation is high
Feature, the present invention on the basis of displacement test, with reference to field test well, have invented a kind of for before glutenite oil reservoir indoors
Put anti-swollen retarded acidizing method.The method of the present invention, by substep to glutenite low permeability pay operation, can effectively inhibit gravel
Strong retraction and speed quick effect of the shale oil layer in transformation and recovery process, are effectively acidified nearly well band oil reservoir, effectively improve glutenite
The recovery ratio of oil reservoir improves daily flow.
The present invention is achieved by the following technical solutions：
It is a kind of to prevent swollen retarded acidizing method for the preposition of glutenite oil reservoir, include the following steps：
(1) the pickling borehole wall：Hydrochloric acid that anti-clayswelling agent and mass concentration are 10%~15% is injected into oil reservoir (preferably
13%), injection mode is：Anti-clayswelling agent is first injected, injects hydrochloric acid or the two mixed injection simultaneously afterwards；After injection, reaction
Time 2h~4h；
The anti-clayswelling agent is the NH that mass concentration is 2%~5%4Cl solution；The quality of anti-clayswelling agent and hydrochloric acid
Than being 0.8~1.2:1 (preferably 1:1)；Anti-clayswelling agent, hydrochloric acid dosage be：Every meter of glutenite core intersection 2m3~5m3
(during concrete application, it can be according to the core intersection and carbonate and alumino-silicate clays ore deposit mineral content system that need to be acidified transformation well
It is fixed)；
During injection, injection sequence is in strict accordance with anti-clayswelling agent is first injected, and the rear sequence for injecting hydrochloric acid or the two are simultaneously
Mixed injection, the reason for this is that：Glutenite oil reservoir is generally glossy wet, is influenced in early period drilling process by slurry compounding, nearly well
A degree of expansion occurs for clay mineral of the wall in sandy gravel materials can be caused during forming mud cake, and need to first inject anti-
Swollen dose is inhibited, if first injecting dilute hydrochloric acid, swelling clay mineral can be caused to aggravate, the pickling borehole wall is caused to be not thorough；
Carry out pickling purpose be：The molten nearly well of fast acid empties pit shaft with calcite and dolomite cement in reservoir
The Reservoir of oil reservoir in interior and 1~2m of pit shaft edge radius moulds enough acid solution accommodating spaces for step (2), reduces note
Enter pressure during main body acidifying solution, increase implantation dosage, improve the operating radius of acidification de-plugging；
(2) main body is acidified：Injected into oil reservoir 1. anti-clayswelling agent and 2. gently with chloro acid or mixed solution (according to
Reservoir carbonate mass percentage, if carbonate mass percentage is less than 25%, by light with slow molten in chloro acid
Agent can preferably achieve the effect that slow corrosion；If quality percentage is more than 25%, acid solution is avoided quickly to be consumed in nearly well
In addition band need to add retarding solvent)；After injection, reaction time 12h~18h (overlong time is easy to precipitate mineral formation blocking)；
Anti-clayswelling agent, the light dosage with chloro acid or mixed solution are：Every meter of glutenite core intersection 2m3~5m3；After injection, instead
It is 3h~5h between seasonable；
The anti-clayswelling agent is the NH that mass concentration is 2%~5%4Cl solution；
The mixed solution is retarding solvent (the polydiene Butyldimethyl chlorine by gently matching chloro acid and mass fraction is 2%
Change ammonium) solution, in mass ratio 0.8~1.2:1 (preferably 1:1) it mixes；
Described is gently by CH with chloro acid2Cl2、CH2ClF、NH4Cl, retarding solvent (polydiene Butyldimethyl ammonium chloride) and
Water composition, wherein, CH2Cl2、CH2ClF and NH4The total weight percent of Cl three accounts for 13%~17% (preferably 15%), delays
Solvent accounts for 8%~12% (preferably 10%), and surplus is water；CH2Cl2、CH2ClF and NH4The mass ratio of Cl three is 0.8~1.2:
0.8~1.2:0.8~1.2 (preferably 1:1:1)；Retarding solvent is act as：It effectively can slowly dissolve (iron) dolomite and (iron) side
Xie Shi, and can effectively anti-sand production；During acidizing treatment, NHCl is made full use of4Antiexpanding action, utmostly inhibit
The water-sensitive effect of the montmorillonite of clay mineral especially；
By the pickling of step (1), sandy gravel materials are changed into semi-hydrophilic by lipophile, have reached stripping pore throat surface
The purpose of part thereof mineral and clay mineral oil film injects expansion-resisting agent, gently (carries out deep with chloro acid and retarding solvent at this time
Acid is molten, and due to the effect of retarding solvent, guarantee is not consumed with chloro acid in nearly well band gently, can be made with the molten nearly well band oil reservoir of effective acid
With radius up to the oil reservoir range of 5~10m, play the role of increasing oil well seepage flow radius), the former is anti-swollen, is gently mixed with chloro acid
It closes retarding solvent (polydiene Butyldimethyl ammonium chloride) and forms inhibition acid, HCl and HF are decomposed slowly to after injecting reservoir, to carbonic acid
The clay mineral of salt and alumino-silicate has the good molten effect of acid；
(3) after pad and displacement fluid：After pad and displacement fluid are implanted sequentially into oil reservoir；After injection, reaction time 3h
~5h；After pad, displacement fluid dosage be：Every meter of glutenite core intersection 2m3~5m3；
The after pad is selected from a concentration of 10% ferrous stability solution, and product designation IRON-2066A (can be conventional
Market is commercially available), it can efficiently prevent calcium and magnesium iron ion from generating sediment；
The displacement fluid is selected from the aqueous ammonium chloride solution that mass percent is 2%~5%；
Ammonium chloride, which has, inhibits swelling clay mineral effect, and anti-iron ion complex precipitant can prevent step (2) acid molten
The iron ion generation complex compound generated in the process, blocks oil reservoir hole and venturi, makes the reaction residue smoothly row of returning, in operation process
It is middle to reduce discharge speed (the determining of specific discharge speed can refer to the quick critical speed of speed), prevent reaction residue from being taken in the row of returning
Band bulky grain residue blocks oil reservoir predominant pathway stenosis, causes speed quick, reduces acid treatment of oil formation correctional effect；This is also glutenite
Acid treatment of oil formation transformation is successfully crucial；
(4) raffinate returns row：Since what the present invention used gently belongs to inhibition acid with chloro acid and retarding solvent, have significant slow
Slow solution ration, inject pit shaft after chemically reacted with carbonate mineral and clay mineral after, pH value is substantially at 6~8, no
Corrosion can be caused to casing, therefore can direct drawing liquid；
(5) heating sucker rod pumping is recovered the oil.
The present invention's prevents swollen retarded acidizing method for the preposition of glutenite oil reservoir, coordinates around preposition anti-swollen, pickling slow
Release acidification, overall process prevent it is swollen, reduce the measures such as discharge speed, utmostly reduce the water-sensitive of glutenite oil reservoir and the quick effect of speed,
Ensure the nearly well band Reservoir Acidization effect of oil well, increase the nearly well band seepage flow radius of oil well conscientiously, be finally reached the mesh for improving recovery ratio
's.
The present invention's prevents swollen retarded acidizing method for the preposition of glutenite oil reservoir, and specific implementation step is divided into three steps：One
It is the pickling borehole wall, injection liquid is expansion-resisting agent, hydrochloric acid, and injection sequence injects hydrochloric acid afterwards in strict accordance with anti-clayswelling agent is first injected
Sequentially or the two simultaneously mixed injection；Second is that injection expansion-resisting agent and the light mixed solution for matching chloro acid, by the acid of the first step
It washes, sandy gravel materials are changed into semi-hydrophilic by lipophile, have reached stripping pore throat surface portion carbonate mineral and clay pit
The purpose of object oil film, injects expansion-resisting agent at this time and gently with chloro acid, the former is anti-swollen, and the latter gently belongs to inhibition acid, note with chloro acid
HCl and HF are decomposed slowly to after entering reservoir, there is the good molten effect of acid to the clay mineral of carbonate and alumino-silicate；Third,
Ammonium chloride and anti-iron ion complex precipitant are injected, the former, which has, inhibits swelling clay mineral effect, and the latter can prevent second
The iron ion generation complex compound generated in step acid dissolution, reducing discharge speed prevents speed quick, enhances acid treatment of oil formation correctional effect.
The present invention solves the problems, such as that existing conventional acidulation method is not suitable for the acidification of highly expanded molding sand conglomerate reservoir, using overall process
Anti-soil adhesion expanding method and the molten technology of inhibition acid acid, have effectively evaded high clay mineral oil reservoir and have been prone to not in acidization
The problem of reversible water-sensitive, and then be conducive to that effective acid is molten and the row's of returning carbonate cements, main body acid solution is effectively increased to carbonic acid
Salt cement it is molten from effect, ensure that measure success rate and the term of validity of acidification.
Specific embodiment
With reference to embodiment, the present invention is further illustrated.
Involved instrument, reagent, material etc., are existing in the prior art unless otherwise noted in following embodiments
Conventional instrument, reagent, material etc., can be obtained by regular commercial sources.Involved experimental method in following embodiments, inspection
Survey method etc. is existing routine experiment method, detection method etc. in the prior art unless otherwise noted.
Instance analysis：G54-x3 wells production layer position is S_1 Formation (Es1121), well section 1061m~1078m
First, reservoir damage factor analysis
Shengli Oil Field G54 blocks main force oil-producing formation S_1 Formation, since 2004 build up production capacity, recovery percent of reserves is low, only
3.4%, wherein G54-3 wells in May, 2004 goes into operation, initial stage day oil 4.2t, initial stage oil production intensity 0.293, until stop in 2013
Production.There are problems that three in block exploitation：First, mesoporous hypotonic (22md), causing that conventional to exploit production capacity low；Second is that diagenetic mineral
Complexity, sensibility are strong, production capacity are caused to decline fast；Third, water injection well water filling is into waterflooding effect is poor.
It is analyzed by the petromineralogy to G54 blocks oil-producing section rock core and petrographic thin section, oil-producing section reservoir framework is with sand
Based on matter particle, for carbonate cements with the characteristics of Local enrichment, other types of calking object amount is few, the potential injury of permeability
Carbonate is mostly come to injure the sensitive of hydrofluoric acid in mud acid；In addition, there is bioclast and sand core in reservoir framework
Roe, cementing mud mould is also that generally, oil bed sensitivity is mainly by the resistance of the mud mould of particle contact position and micro- brilliant percarbonate particle
Stagnant to cause, the filling of crystallite calcite and cementing (dyeing RED sector), hole is mostly that calcite densification is cementing, remaining intergranular
Hole seldom sees, Reservoir and permeability injury are mainly the cementing destruction for causing reservoir permeability of carbonate.
According to the X diffraction total rock of G54 block rock samples and clay analysis result, clay mineral quality percentage composition (the same below)
21%~35%, wherein Yi Meng interbeds ratio is 75%~80%, in illite/smectite mixed layer percentage composition 72%~90%, i.e. clay mineral
Mainly based on montmorillonite, belong to expanded clay mineral, there is extremely strong water sensitivity, the conventional acid solution (acid of mud acid and hydrochloric acid
Liquid system) injection reservoir causes nearly well band oil reservoir that serious water-sensitive occurs, injection pressure is caused to be significantly increased, can not acid it is molten near
The purpose of de-plugging is not achieved in hydrochloride mineral of the well with oil reservoir.
The solution used：
1st, gently with chloro acid：Slow dissolving calcareous incrustation (hidden cloud matter) and calcite, reservoir is containing about calcareous incrustation (hidden cloud
Matter) and calcite 15%.It is by CH2Cl2、CH2ClF、NH4Cl, retarding solvent (polydiene Butyldimethyl ammonium chloride) and water composition
, wherein, CH2Cl2、CH2ClF and NH4The total weight percent of Cl three accounts for 15%, and retarding solvent accounts for 10%, and surplus is water；
CH2Cl2、CH2ClF and NH4The mass ratio of Cl three is 1:1:1.
2nd, retarding solvent (polydiene Butyldimethyl ammonium chloride)：Slow down inorganic mineral by the speed of acid etching.
3rd, after pad：10% ferrous stability solution, product designation IRON-2066A, anti-iron ion complex precipitant
Solution can efficiently prevent calcium and magnesium iron ion from generating sediment.
4th, ammonium chloride solution (mass concentration 3%)：It is anti-swollen, because containing a small amount of mixed-layer clay in reservoir.
5th, displacement fluid：Ammonium chloride solution (mass concentration 3%).
2nd, method for removing blockage
In August, 2013 implements acid fracturing operation, and method is as follows：
(1) the pickling borehole wall：Anti-clayswelling agent (10m is injected into oil reservoir3) and mass concentration be 13% hydrochloric acid (10m3),
Injection mode is：The two while mixed injection, fluid injection speed：1.0m3/min；After injection, reaction time 3h；
(2) main body is acidified：Anti-clayswelling agent (20m is injected into oil reservoir3) and mixed solution (20m3)；Fluid injection speed：
1.0m3/min；After injection, reaction time 4h；
The mixed solution is retarding solvent (the polydiene Butyldimethyl chlorine by gently matching chloro acid and mass fraction is 2%
Change ammonium) solution, in mass ratio 1:1 mixes；
(3) after pad and displacement fluid：After pad (10m is implanted sequentially into oil reservoir3) and displacement fluid (10m3)；Fluid injection speed：
1.5m3/min；After injection, reaction time 4h；
(4) raffinate returns row；
(5) heating sucker rod pumping is recovered the oil.
Implementation result：Initial stage day liquid 5.7t compared with 5.7t is increased before acid fracturing, compared with 2.0t is increased before acid fracturing, increases production day oil 2.0t
Effect is preferable.
Embodiment 1 prevents swollen retarded acidizing method for the preposition of glutenite oil reservoir
Step is as follows：
(1) the pickling borehole wall：Anti-clayswelling agent 10m is injected into oil reservoir3With the hydrochloric acid 10m that mass concentration is 13%3, injection
Mode is：The two while mixed injection, fluid injection speed：1.0m3/min；After injection, reaction time 3h；
The anti-clayswelling agent is the NH that mass concentration is 3%4Cl solution；
(2) main body is acidified：Anti-clayswelling agent 20m is injected into oil reservoir3And mixed solution 20m3；Fluid injection speed：
1.0m3/min；After injection, reaction time 4h；
The mixed solution is molten by the polydiene Butyldimethyl ammonium chloride for gently matching chloro acid and mass fraction is 2%
Liquid, in mass ratio 1:1 mixes；
Described is gently by CH with chloro acid2Cl2、CH2ClF、NH4Cl, polydiene Butyldimethyl ammonium chloride and water composition
, wherein, CH2Cl2、CH2ClF and NH4The total weight percent of Cl three accounts for 15%, and retarding solvent accounts for 10%, and surplus is water；
CH2Cl2、CH2ClF and NH4The mass ratio of Cl three is 1:1:1；
(3) after pad and displacement fluid：After pad 10m is implanted sequentially into oil reservoir3With displacement fluid 10m3；Fluid injection speed：
1.5m3/min；After injection, reaction time 4h；
The after pad is selected from a concentration of 10% anti-iron ion complex-precipitation agent solution；
The displacement fluid is selected from the aqueous ammonium chloride solution that mass percent is 3%；
(4) raffinate returns row；
(5) heating sucker rod pumping is recovered the oil.
Embodiment 2 prevents swollen retarded acidizing method for the preposition of glutenite oil reservoir
Step is as follows：
(1) the pickling borehole wall：Anti-clayswelling agent and mass concentration are injected into oil reservoir for 10% hydrochloric acid, injection mode is：
Anti-clayswelling agent is first injected, injects hydrochloric acid afterwards；After injection, reaction time 2h；
The anti-clayswelling agent is the NH that mass concentration is 5%4Cl solution；The mass ratio of anti-clayswelling agent and hydrochloric acid is
0.8:1；The dosage of hydrochloric acid is：Every meter of glutenite core intersection 5m3；
(2) main body is acidified：1. anti-clayswelling agent is injected into oil reservoir and 2. gently with chloro acid or mixed solution；Clay
Expansion-resisting agent, the light dosage with chloro acid or mixed solution are：Every meter of glutenite core intersection 5m3；After injection, the reaction time is
3h；
The anti-clayswelling agent is the NH that mass concentration is 5%4Cl solution；
The mixed solution is molten by the polydiene Butyldimethyl ammonium chloride for gently matching chloro acid and mass fraction is 2%
Liquid, in mass ratio 0.8:1 mixes；
Described is gently by CH with chloro acid2Cl2、CH2ClF、NH4Cl, polydiene Butyldimethyl ammonium chloride and water composition
, wherein, CH2Cl2、CH2ClF and NH4The total weight percent of Cl three accounts for 13%, and retarding solvent accounts for 12%, and surplus is water；
CH2Cl2、CH2ClF and NH4The mass ratio of Cl three is 0.8:1.2:0.8；
(3) after pad and displacement fluid：After pad and displacement fluid are implanted sequentially into oil reservoir；After injection, reaction time 3h；
After pad, displacement fluid dosage be：Every meter of glutenite core intersection 2m3；
The after pad is selected from a concentration of 10% anti-iron ion complex-precipitation agent solution；
The displacement fluid is selected from the aqueous ammonium chloride solution that mass percent is 5%；
(4) raffinate returns row；
(5) heating sucker rod pumping is recovered the oil.
Embodiment 3 prevents swollen retarded acidizing method for the preposition of glutenite oil reservoir
Step is as follows：
(1) the pickling borehole wall：Anti-clayswelling agent and mass concentration are injected into oil reservoir for 15% hydrochloric acid, injection mode is：
The two while mixed injection；After injection, reaction time 4h；
The anti-clayswelling agent is the NH that mass concentration is 2%4Cl solution；The mass ratio of anti-clayswelling agent and hydrochloric acid is
1.2:1；Anti-clayswelling agent, hydrochloric acid dosage be：Every meter of glutenite core intersection 2m3；
(2) main body is acidified：1. anti-clayswelling agent is injected into oil reservoir and 2. gently with chloro acid or mixed solution；Clay
Expansion-resisting agent, the light dosage with chloro acid or mixed solution are：Every meter of glutenite core intersection 2m3；After injection, the reaction time is
5h；
The anti-clayswelling agent is the NH that mass concentration is 2%4Cl solution；
The mixed solution is molten by the polydiene Butyldimethyl ammonium chloride for gently matching chloro acid and mass fraction is 2%
Liquid, in mass ratio 1.2:1 mixes；
Described is gently by CH with chloro acid2Cl2、CH2ClF、NH4Cl, polydiene Butyldimethyl ammonium chloride and water composition
, wherein, CH2Cl2、CH2ClF and NH4The total weight percent of Cl three accounts for 17%, and retarding solvent accounts for 8%, and surplus is water；
CH2Cl2、CH2ClF and NH4The mass ratio of Cl three is 1.2:0.8:1.2；
(3) after pad and displacement fluid：After pad and displacement fluid are implanted sequentially into oil reservoir；After injection, reaction time 5h；
After pad, displacement fluid dosage be：Every meter of glutenite core intersection 5m3；
The after pad is selected from a concentration of 10% anti-iron ion complex-precipitation agent solution；
The displacement fluid is selected from the aqueous ammonium chloride solution that mass percent is 2%；
(4) raffinate returns row；
(5) heating sucker rod pumping is recovered the oil.
Although above-mentioned be described the specific embodiment of the present invention in conjunction with the embodiments, not the present invention is protected
The limitation of range, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art
The various modifications or changes that can be made are not needed to make the creative labor still within protection scope of the present invention.
Claims (7)
1. a kind of prevent swollen retarded acidizing method for the preposition of glutenite oil reservoir, it is characterised in that：Include the following steps：
(1) the pickling borehole wall：Anti-clayswelling agent and mass concentration are injected into oil reservoir for 10%~15% hydrochloric acid, injection mode
For：Anti-clayswelling agent is first injected, injects hydrochloric acid or the two mixed injection simultaneously afterwards；After injection, reaction time 2h~4h；Institute
It is the NH that mass concentration is 2%~5% to state anti-clayswelling agent4Cl solution；The mass ratio of anti-clayswelling agent and hydrochloric acid for 0.8~
1.2:1；Anti-clayswelling agent, hydrochloric acid dosage be：Every meter of glutenite core intersection 2m3~5m3；
(2) main body is acidified：1. anti-clayswelling agent is injected into oil reservoir and 2. gently with chloro acid or mixed solution；Anti-clayswelling
Agent, the light dosage with chloro acid or mixed solution are：Every meter of glutenite core intersection 2m3~5m3；After injection, the reaction time is
3h~5h；
The anti-clayswelling agent is the NH that mass concentration is 2%~5%4Cl solution；
The mixed solution is the polydiene Butyldimethyl ammonium chloride solution by gently matching chloro acid and mass fraction is 2%, is pressed
Mass ratio 0.8~1.2:1 mixes；
Described is gently by CH with chloro acid2Cl2、CH2ClF、NH4What Cl, polydiene Butyldimethyl ammonium chloride and water formed,
In, CH2Cl2、CH2ClF and NH4The total weight percent of Cl three accounts for 13%~17%, and retarding solvent accounts for 8%~12%, and surplus is
Water；CH2Cl2、CH2ClF and NH4The mass ratio of Cl three is 0.8~1.2:0.8~1.2:0.8~1.2；
(3) after pad and displacement fluid：After pad and displacement fluid are implanted sequentially into oil reservoir；After injection, the reaction time is 3h~5h；
After pad, displacement fluid dosage be：Every meter of glutenite core intersection 2m3~5m3；
The after pad is selected from a concentration of 10% anti-iron ion complex-precipitation agent solution；
The displacement fluid is selected from the aqueous ammonium chloride solution that mass percent is 2%~5%；
(4) raffinate returns row；
(5) heating sucker rod pumping is recovered the oil.
2. according to claim 1 prevent swollen retarded acidizing method for the preposition of glutenite oil reservoir, it is characterised in that：It is described
Anti-clayswelling agent is the NH that mass concentration is 3%4Cl solution.
3. according to claim 1 prevent swollen retarded acidizing method for the preposition of glutenite oil reservoir, it is characterised in that：It is described
The mass ratio of anti-clayswelling agent and hydrochloric acid is 1:1.
4. according to claim 1 prevent swollen retarded acidizing method for the preposition of glutenite oil reservoir, it is characterised in that：It is described
Mixed solution is by gently matching chloro acid and mass fraction for 2% polydiene Butyldimethyl ammonium chloride solution in mass ratio 1:1
It mixes.
5. according to claim 1 prevent swollen retarded acidizing method for the preposition of glutenite oil reservoir, it is characterised in that：It is described
It is gently by CH with chloro acid2Cl2、CH2ClF、NH4What Cl, polydiene Butyldimethyl ammonium chloride and water formed, wherein, CH2Cl2、
CH2ClF and NH4The total weight percent of Cl three accounts for 15%, and retarding solvent accounts for 10%, and surplus is water；CH2Cl2、CH2ClF and
NH4The mass ratio of Cl three is 1:1:1.
6. according to claim 1 prevent swollen retarded acidizing method for the preposition of glutenite oil reservoir, it is characterised in that：It is described
Displacement fluid is selected from the aqueous ammonium chloride solution that mass percent is 3%.
7. prevent swollen retarded acidizing method, spy for the preposition of glutenite oil reservoir according to according to any one of claims 1 to 6
Sign is：Step is as follows：
(1) the pickling borehole wall：Anti-clayswelling agent 10m is injected into oil reservoir3With the hydrochloric acid 10m that mass concentration is 13%3, injection mode
For：The two while mixed injection, fluid injection speed：1.0m3/min；After injection, reaction time 3h；
The anti-clayswelling agent is the NH that mass concentration is 3%4Cl solution；
(2) main body is acidified：Anti-clayswelling agent 20m is injected into oil reservoir3And mixed solution 20m3；Fluid injection speed：1.0m3/
min；After injection, reaction time 4h；
The mixed solution is the polydiene Butyldimethyl ammonium chloride solution by gently matching chloro acid and mass fraction is 2%, is pressed
Mass ratio 1:1 mixes；
Described is gently by CH with chloro acid2Cl2、CH2ClF、NH4What Cl, polydiene Butyldimethyl ammonium chloride and water formed,
In, CH2Cl2、CH2ClF and NH4The total weight percent of Cl three accounts for 15%, and retarding solvent accounts for 10%, and surplus is water；CH2Cl2、
CH2ClF and NH4The mass ratio of Cl three is 1:1:1；
(3) after pad and displacement fluid：After pad 10m is implanted sequentially into oil reservoir3With displacement fluid 10m3；Fluid injection speed：1.5m3/
min；After injection, reaction time 4h；
The after pad is selected from a concentration of 10% anti-iron ion complex-precipitation agent solution；
The displacement fluid is selected from the aqueous ammonium chloride solution that mass percent is 3%；
(4) raffinate returns row；
(5) heating sucker rod pumping is recovered the oil.
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| CN201611120202.5A CN108166959A (en) | 2016-12-07 | 2016-12-07 | It is a kind of to prevent swollen retarded acidizing method for the preposition of glutenite oil reservoir |
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| CN201611120202.5A CN108166959A (en) | 2016-12-07 | 2016-12-07 | It is a kind of to prevent swollen retarded acidizing method for the preposition of glutenite oil reservoir |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060116296A1 (en) * | 2004-11-29 | 2006-06-01 | Clearwater International, L.L.C. | Shale Inhibition additive for oil/gas down hole fluids and methods for making and using same |
| CN101781982A (en) * | 2010-02-25 | 2010-07-21 | 中国石油化工股份有限公司 | Short-injection water injection well acidation injectivity process |
| CN104295275A (en) * | 2013-07-17 | 2015-01-21 | 中国石油化工股份有限公司 | Deep blockage removal and injection increase method for water injection well of medium-and-high-permeability sandstone reservoir |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060116296A1 (en) * | 2004-11-29 | 2006-06-01 | Clearwater International, L.L.C. | Shale Inhibition additive for oil/gas down hole fluids and methods for making and using same |
| CN101781982A (en) * | 2010-02-25 | 2010-07-21 | 中国石油化工股份有限公司 | Short-injection water injection well acidation injectivity process |
| CN104295275A (en) * | 2013-07-17 | 2015-01-21 | 中国石油化工股份有限公司 | Deep blockage removal and injection increase method for water injection well of medium-and-high-permeability sandstone reservoir |
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| 尹光伟: "花场油田酸化解堵用酸液体系的评价与应用", 《石油化工应用》 * |
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Application publication date: 20180615 |