CN104031625B - De-plugging agent and using method for hypotonic permeable Heterogeneous Sandstone Reservoirs - Google Patents
De-plugging agent and using method for hypotonic permeable Heterogeneous Sandstone Reservoirs Download PDFInfo
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
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- C—CHEMISTRY; METALLURGY
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/536—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning characterised by their form or by the form of their components, e.g. encapsulated material
Abstract
The invention discloses a kind of de-plugging agent for hypotonic permeable Heterogeneous Sandstone Reservoirs and using method, de-plugging agent includes A agent, B agent and C agent, and the percentage by weight of A agent, B agent and the constituent of C agent and each component is as follows: A agent is that water forms by oxidant 10 25%, activator 8 12%, surplus；B agent is that water forms by reducing agent 10 15%, foaming agent 0.3 1.2%, foam stabilizer 0.3 0.6%, surplus；C agent is by HCL8 12%, organic acid 6 10%, NH4HF22 5%, corrosion inhibiter 0.5 1.5%, ferrous stability 0.5 1.5%, surplus are water composition, using method: the first step: preparation A agent, B agent and C agent；Second step: first A agent is injected stratum by pipeline, then B agent is injected stratum, finally stratum, beneficial effects of the present invention: present invention could apply to water injection well increasing injection and well deep part de-plugging are injected in C agent；The present invention is applied to have during the intensified injection of wells in the block of reservoir heterogeneity oil field better.
Description
Technical field
The present invention relates to a kind of de-plugging agent and using method, particularly to a kind of solution for hypotonic permeable Heterogeneous Sandstone Reservoirs
Blocking agent and using method.
Background technology
At present, during oil extraction in oil field, especially for low permeability oil field, along with the prolongation of production time, nearly well ground
Band blocking constantly increases the weight of, and formation fluid filtrational resistance increases, and causes well water injection pressure to raise water injection rate and reduces, and oil well output is big
Amplitude declines, and for releasing blocking, Acidizing Technology is to maintain the main volume increase of oil field high-efficiency mining, well stimulation, uses the most more
Matrix acidifying technology carries out de-plugging, and for this type of situation, commonly used is sandstone matrix acidifying, can divide from acidifying mechanism
For: the acidifying of soil acid acidizing, retarded acid, foamed acid acidifying and viscous acid acidifying.
The first kind, soil acid acidizing utilizes the silicates mineral such as the clay in the hydrofluoric acid dissolution stratum in mud acid, Anhydrite,
Reaching to improve the effect of near wellbore formation permeability, this type of technological deficiency is that to improve radius little, is easily generated secondary injury, effect duration
Short.Such as " to the injury analysis after the process of sandstone reservoir mud acid and treatment measures ", Inner Mongol petrochemical industry, 12 phases in 2005, divide
The various injuries after sandstone reservoir is implemented acidification technique and corresponding treatment measures are analysed；" Sandstone Acidizing Technique is at Shanxi 45 oil
Application in the exploitation of field ", oil and gas well testing, the 3rd phase of volume 10 calendar year 2001, in Shanxi 45, sandstone oil field has carried out soil acid acidizing solution
Stifled, the initial stage achieves better effects, but effect duration is short.
Equations of The Second Kind, retarded acid acidifying mainly uses the weak acid such as formic acid, acetic acid, boric acid, phosphoric acid to react in the earth formation with villiaumite
Generate Fluohydric acid., dissolve the silicates mineral such as the clay in stratum, Anhydrite, reach to improve the effect of in-place permeability, this type of
Acidifying major advantage is that operating radius is relatively big, and secondary injury is weak compared with mud acid, but when being applied to anisotropism stratum, acid solution is mainly entered
Enter height and ooze stratum, limited to low permeability formation improvement result, do not reach the purpose of effective de-plugging.Such as " polyatomic recombination acid increasing injection
Technology is in the application in Wen Nan oil field ", drilling technique, the 4th phase of volume 24 calendar year 2001, use HCl, phosphoric acid and Organic acids dissolution
Siliceous, the tamper of shale class, releases formation damage；High efficiency composition oil-water well de-plugging agent synthetic method, publication number
CN1244566A, be composited in proportion a kind of composite blockage relieving agent by organic acid, organic solvent and surfactant, can dissolve nothing
Machine and organic plugging.
3rd class, foamed acid acidifying is to add a certain proportion of foaming agent, with nitrogen, carbon dioxide gas in conventional acid solution
Or natural gas mixing also high-speed stirred, being formed with acid solution as continuous phase, bubble is the foam system of dispersion phase, and this type of acid is applicable to
The low pressure oil gas well stimulation of the row's of returning difficulty, its shortcoming is owing to adding of gas increases the machine cost of construction, generates
Foam size is uneven, is easily generated that gas is stifled causes operation pressure too high in work progress, and stratum is caused cold by the liquid gas of employing
Injury.Such as " turning to acid to carry out the execute-in-place experience of acidizing treatment with foam ", Oilfields engineering, 2000 volume 12 the 5th
Phase, for high-water-cut oil-producing well, preferential employing foamed acid buffer carries out acidizing treatment, and it penetrates into the radius of curvature of oil reservoir and reaches 2ft
Time above, achieve preferable effect；A kind of acidifying method for removing blockage, publication number CN101255789A, at conventional acidulation system base
On plinth, add a liquid carbon dioxide or nitrogen slug, as energization slug, promote that acid solution returns row；Foamed acid de-plugging skill
Art, publication number CN102094614A, in conventional acid solution, add foaming agent and foam stabilizer, mixed with gas by foam maker
Close, make system have aerated fluid character and souring ability.
4th class, viscous acid acidifying is to add a certain amount of acid liquor gellant or polymer etc. in conventional acid liquid system,
Can reduce acid liquid loss speed, reduce the response speed of acid and formation rock, thus be greatly increased active acid effectively penetrate away from
From, its major defect is that viscous acid returns row's difficulty, is easily generated secondary injury.As " TH become sticky acid acid fluid system research and should
With ", Henan science, the 6th phase of volume 22 in 2000, on-the-spot test shows, uses the acid system construction that becomes sticky, and fracture length is relatively gelled
Acid system construction doubles, and leakoff coefficent and acid liquid loss amount reduce about 50%, and effect of increasing production improves on the basis of gel acid
2.5 times.
In sum, the problem that the acidifying of several classes in currently available technology block releasing technique exists following several respects:
1, to improve radius little in regular mud acid acidifying, is easily generated secondary injury, and effect duration is short；
2, when retarded acid is applied to anisotropism stratum, acid solution primarily enters height and oozes stratum, has low permeability formation improvement result
Limit, does not reaches the purpose of effective de-plugging；
3, generate foam size during foamed acid acidifying uneven, work progress be easily generated gas is stifled causes operation pressure too high,
Cold damage is caused in stratum by the liquid gas used；
4, there is the row's of returning difficulty, the problem being easily generated secondary injury during viscous acid acidifying.
Summary of the invention
The invention aims to solve in the recovery process of low permeability oil field, commonly used sandstone matrix acidifying
Technology carries out the problems of de-plugging generation and a kind of de-plugging agent for hypotonic permeable Heterogeneous Sandstone Reservoirs of providing and user
Method.
De-plugging agent for hypotonic permeable Heterogeneous Sandstone Reservoirs of the present invention includes A agent, B agent and C agent, A agent, B agent
Constituent and the percentage by weight of each component with C agent are as follows:
A agent is that water forms by oxidant 10-25%, activator 8-12%, surplus, and wherein oxidant is sodium nitrite or Asia
Ammonium nitrate or potassium nitrite；Activator is hydrochloric acid or phosphoric acid or hydrochloric acid and the mixture of phosphoric acid；
B agent is that water forms, wherein by reducing agent 10-15%, foaming agent 0.3-1.2%, foam stabilizer 0.3-0.6%, surplus
Reducing agent is carbamide or sodium carbonate or ammonium hydrogen carbonate；Foaming agent is glycine betaine or dodecyl sodium sulfate or lauryl sulphate acid
Sodium；Foam stabilizer is polyacrylamide；The formal name used at school of glycine betaine is dimethyl-β-DMPT；
C agent is by HCL8-12%, organic acid 6-10%, NH4HF22-5%, corrosion inhibiter 0.5-1.5%, ferrous stability
0.5-1.5%, surplus are water composition, and wherein organic acid is organic phosphoric acid or acetic acid or organic sulfonic acid or citric acid；Corrosion inhibiter is
Phosphonic acids is pitched in cetylamine or sodium nitrate or hydroxy ethylene diphosphonic acid or diethylenetriamine five；Ferrous stability is ethylenediamine tetraacetic
Acetate or citrate or diethylenetriamine pentacarboxylic acid salt；
The volume ratio of A agent and B agent is 1:1.8～2.3, and the volume ratio of A agent and C agent is 1:1.9～2.2.
As described below for the using method of the de-plugging agent of hypotonic permeable Heterogeneous Sandstone Reservoirs:
The first step: respectively in three Agitation Tanks prepare A agent, B agent and C agent, and make under room temperature, atmospheric pressure state A agent,
B agent and C agent uniform mixing；
Second step: first by pipeline, A agent is injected stratum, beats clear water isolation slug, then B agent is injected stratum, finally by C
Stratum is injected in agent, and the volume ratio of A agent and B agent is 1:1.8～2.3, and the volume ratio of A agent and C agent is 1:1.9～2.2, A agent, B agent
With total injection rate of C agent depending on strata condition, vexed well 8-12 hour after replacement, after in liquid to be mixed, each component is fully reacted,
Drive a well the row of returning, then carries out normal water filling or oil recovery.
The reaction principle of the present invention is as follows:
A agent and B agent are mainly by carbamide (carbonyl diamine CO (NH2)2), nitrite, activator and foaming agent and foam stabilizer
Composition, can react at the formation temperature, and its reaction equation is as follows:
Formed after the gas and the foaming agent that generate after reaction and foam stabilizer effect and of uniform size stablize bubble, effectively block
High permeability formation, makes follow-up C agent can realize uniform acid distribution when injecting, and the heat of generation can release the organic plugging such as asphalitine, colloid.
C agent is mainly made up of organic retardant, villiaumite and additive, can release the drilling mud pollution on stratum, water
Dirt pollutes, solid particle blocking, improves in-place permeability, and the calcium ion in the organic retardant energy complexation stratum of employing reduces
The injury of secondary precipitation.
The most important improvement of the present invention is heating element system the most angry in layer and raw foam system and deep acidification body
System organically combines, and has three kinds of respective advantages of system, is particularly suitable for and well in low permeable and heterogeneity reservoir
Increasing injection and well deep part de-plugging.
Beneficial effects of the present invention:
1, present invention could apply to after water injection well increasing injection and well deep part de-plugging, A agent and B agent react in the earth formation
Generating a large amount of gas and heat, gas generates with foaming agent effect stablizes bubble uniformly, can effectively block high permeability formation, after making
Continuous acid solution can realize uniform acid distribution when injecting, and can release the drilling mud pollution on stratum, incrustation scale pollution, solid particle blocking,
Improve in-place permeability, it is achieved deep is effectively acidified；The heat generated can release the organic plugging such as asphalitine, colloid；Generate
Gas bubble foam viscosity big, carrying capacity is strong, and pit shaft is taken in microgranule and the secondary precipitation that will produce after acidifying during the row of returning out of, increasing
HCl dropwise effective percentage；
2, the present invention is applied to have during the intensified injection of wells in the block of reservoir heterogeneity oil field better, the bubble of generation
Foam can block high permeability formation, and acid solution releases ground deep layer and pollutes and be effectively improved the permeability of low-permeability layer, adjusts intake profile, it is achieved
Effectively water filling；
3, the present invention is applied to during the low common heavy oil oil well of stratum energy better, and A agent and B agent are reacted in the earth formation
The a large amount of gas of rear generation and heat, gas can increase stratum energy, and gas can reduce oil viscosity after being dissolved in crude oil, generation
Heat can release the organic plugging such as gum asphalt.
Accompanying drawing explanation
Fig. 1 is high temperature and high voltage experimental device.
Tubular type physical simulation experiment device based on Fig. 2.
1, High Temperature High Pressure adiabatic reaction still 2, high pressure nitrogen steel cylinder 3, long rock core holder 4, calorstat.
Detailed description of the invention
Embodiment one:
A kind of de-plugging agent for hypotonic permeable Heterogeneous Sandstone Reservoirs includes A agent, B agent and C agent, A agent, B agent and the group of C agent
The percentage by weight becoming composition and each component is as follows:
A agent is made up of sodium nitrite 10%, hydrochloric acid 8% and water 82%；B agent is by carbamide 10%, sodium lauryl sulphate
0.3%, polyacrylamide 0.3% and water 89.4% form；C agent is by HCL8%, organic phosphoric acid 6%, NH4HF22%, cetylamine
0.5%, edetate 0.5% and water 83% form.
By the volume ratio of A agent, B agent and C agent be 1:2:2 with the use of, total injection rate of A agent, B agent and C agent regards stratum feelings
Depending on condition.
Embodiment two:
A kind of de-plugging agent for hypotonic permeable Heterogeneous Sandstone Reservoirs includes A agent, B agent and C agent, A agent, B agent and the group of C agent
The percentage by weight becoming composition and each component is as follows:
A agent is made up of sodium nitrite 25%, hydrochloric acid 12% and water 63%；B agent is by carbamide 15%, sodium lauryl sulphate
1.2%, polyacrylamide 0.6% and water 83.2% form；C agent is by HCL12%, organic phosphoric acid 10%, NH4HF25%, hexadecane
Amine 1.5%, edetate 1.5% and water 70% form.
By the volume ratio of A agent, B agent and C agent be 1:1.8:2 with the use of, total injection rate of A agent, B agent and C agent regards stratum
Depending on situation.
Embodiment three:
A kind of de-plugging agent for hypotonic permeable Heterogeneous Sandstone Reservoirs includes A agent, B agent and C agent, A agent, B agent and the group of C agent
The percentage by weight becoming composition and each component is as follows:
A agent is made up of sodium nitrite 18%, hydrochloric acid 10% and water 72%；B agent is by carbamide 13%, sodium lauryl sulphate
0.8%, polyacrylamide 0.5% and water 85.7% form；C agent is by HCL10%, organic phosphoric acid 8%, NH4HF24%, hexadecane
Amine 1%, edetate 1% and water 76% form.
By the volume ratio of A agent, B agent and C agent be 1:2.3:2.2 with the use of, total injection rate of A agent, B agent and C agent regards ground
Depending on layer situation.
During onsite application, carry out as follows:
The first step: take each component material disclosed by previous embodiment one or embodiment two or embodiment three, respectively three
Individual Agitation Tank is prepared A agent, B agent and C agent, and under room temperature, atmospheric pressure state, makes A agent, B agent and C agent uniform mixing；
Second step: first by pipeline, A agent is injected stratum, beats clear water isolation slug, then B agent is injected stratum, finally by C
Stratum is injected in agent, and total injection rate of A agent, B agent and C agent is depending on strata condition, and vexed well 8-12 hour after replacement, in liquid to be mixed
After each component is fully reacted, drive a well the row of returning, then carries out normal water filling or oil recovery.
Experimental evaluation:
Experiment one:
This experiment uses each component proportion in embodiment one, generates a large amount of by A agent and B agent hybrid reaction in a reservoir
Gas and heat, as shown in Figure 1.
Experimentation: in High Temperature High Pressure adiabatic reaction still 1, adds certain volume and certain density inflating medium solution,
Set High Temperature High Pressure adiabatic reaction still 1 temperature as 20 DEG C, constant temperature 0.5h, opens high pressure nitrogen steel cylinder 2, system pressure rises to institute
Needing pressure P0, the temperature and pressure situation of change in record temperature-rise period, after temperature rises to design temperature, constant temperature is extremely pressed for two hours
Power no longer changes, and reaction terminates, and pressure release is lowered the temperature, and clears up High Temperature High Pressure adiabatic reaction still 1, and concrete numerical value is as shown in the table:
Experiment two:
This experiment uses the proportioning in embodiment one, and basis tubular type physical simulation experiment dress is injected in A agent and B agent segmentation plug
Put (see accompanying drawing 2) so that it is hybrid reaction generates a large amount of gases in long rock core holder 3, is mixed to form a large amount of body with foaming agent
Long-pending bubble of stablizing uniformly, closure high permeability formation.
From the point of view of experimentation, after injection A agent and B agent are fully reacted, start injected clear water, long rock core holder 3 two ends
Pressure reduction persistently raise, the port of export gradually produces stable aerated fluid, and along with the increase of water flush volume, closure takes the lead in reducing
Rear increase, is finally declining, is tending to the most stable, and concrete numerical value is as shown in the table:
Experiment three:
This experiment uses the proportioning in embodiment one, A agent, B agent and C agent segmentation plug is injected basis tubular type physical modeling real
Experiment device (see accompanying drawing 2), is below experimental procedure:
(1) long cores being saturated oil and water is placed in calorstat 4, connects each instrument and equipment by Fig. 2, by calorstat
4 put formation temperature.
(2) carrying out water drive, continuous driving is for guarantee that model reaches target remaining oil state.In oil displacement process with several not
The graduated cylinder of same volume is collected and is discharged liquid, and record each time discharge liquid measure, the time, pressure, temperature, calculate original permeability
KO。
(3) stopping after water drive, inject chemical agent in model, pressure is to inject under 10MPa, carries out composite blockage relieving, and
Under this pressure " closing well ".
(4) after " closing well " time reaches 3-4 hour, " driving a well " realizes the row of returning, with the graduated cylinder of several different volumes respectively
Collect and discharge liquid, and record the discharge liquid measure of each time, time used, pressure, and temperature.
(5) again carry out water drive, and record each time discharge liquid measure, the time, pressure, temperature, calculate rock core after improvement
Permeability K, concrete numerical value is as shown in the table:
From the point of view of experimental data, after injecting A agent, permeability has a certain degree of improvement, is owing to the acid solution in A agent is dissolved
Carbonate in rock core, injects the permeability decrease of test after B agent relatively big, be contact in rock core with B agent due to A agent after instead
Should, generate a large amount of foam blocking high permeability formation, after injecting C agent, permeability increases considerably, and illustrates that rock core has been carried out very by acid solution
Good improvement, after injection, the final permeability increase rate of base fluid test reaches 6-12 times, illustrates that reservoir is had very well by the present invention
Correctional effect.
Claims (1)
1. the de-plugging agent for hypotonic permeable Heterogeneous Sandstone Reservoirs, it is characterised in that: include A agent, B agent and C agent, A agent, B
The percentage by weight of agent and the constituent of C agent and each component is as follows:
A agent is that water forms by oxidant 10-25%, activator 8-12%, surplus, and wherein oxidant is sodium nitrite or nitrous acid
Ammonium or potassium nitrite；Activator is hydrochloric acid or phosphoric acid or hydrochloric acid and the mixture of phosphoric acid；
B agent is that water forms by reducing agent 10-15%, foaming agent 0.3-1.2%, foam stabilizer 0.3-0.6%, surplus, wherein reduces
Agent is carbamide；Foaming agent is glycine betaine or dodecyl sodium sulfate or sodium lauryl sulphate；Foam stabilizer is polyacrylamide；
C agent is by HCl 8-12%, organic acid 6-10%, NH4HF22-5%, corrosion inhibiter 0.5-1.5%, ferrous stability 0.5-
1.5%, surplus is water composition, and wherein organic acid is organic phosphoric acid or acetic acid or organic sulfonic acid or citric acid；Corrosion inhibiter is 16
Phosphonic acids is pitched in alkanamine or sodium nitrate or hydroxy ethylene diphosphonic acid or diethylenetriamine five；Ferrous stability is ethylenediaminetetraacetic acid
Salt or citrate or diethylenetriamine pentacarboxylic acid salt；
The volume ratio of A agent and B agent be the volume ratio of 1:1.8-2.3, A agent and C agent be 1:1.9-2.2.
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| CN101955770A (en) * | 2010-05-14 | 2011-01-26 | 北京奥凯立科技发展股份有限公司 | Main acid for oil well drilling and multi-hydrogen acid acidulating system with main acid |
| CN102373036A (en) * | 2010-08-16 | 2012-03-14 | 安东石油技术（集团）有限公司 | Gas self-production agent, use of the gas self-production agent, and self-produced gas foam acidizing method for oil wells and water wells |
| CN102635344A (en) * | 2012-04-13 | 2012-08-15 | 中国石油天然气股份有限公司 | Composite blocking-removal method for improving flow conductivity of triple-low sandstone reservoir |
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