CN102703045B - Multi-slug composite pressure decreasing and injection increasing agent for ultra-low permeability oil field - Google Patents
Multi-slug composite pressure decreasing and injection increasing agent for ultra-low permeability oil field Download PDFInfo
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Abstract
The invention relates to a multi-slug composite pressure decreasing and injection increasing agent for an ultra-low permeability oil field and belongs to the technical field of chemical pressure decreasing and injection increasing of the ultra-low permeability oil field. According to the agent, active retarded acid, a complex antiscaling agent, a shrinking agent and an antisludging agent are integrated, and a multi-slug and staging injection mode is adopted, so that the plugging of the formation of a water injection well of the ultra-low permeability oil field is effectively eliminated, the injection allocation of an under injection well is realized, and the water injection pressure of the under injection well is reduced, the energy of the formation is supplemented, and the recovery efficiency of crude oil is improved. The problem of low acidification effect and short effective period of measures, which are caused by shortened penetrating distance, the problem that the effects of an active agent are reduced because the active agent cannot reach a far well zone, and the problems of reduced permeability, shortened effective period, ineffectiveness or increased water injection pressure, which are caused by incompatibility of formation fluid and new generated precipitates in the process of applying the conventional single pressure decreasing and injection increasing technology to the ultra-low permeability oil field at site can be solved. The results of a site test prove that the effective rate of the measures can reach 91.3 percent, and the pressure of a single well can be decreased by 1.5MPa averagely.
Description
Technical field
The present invention relates to a kind of ultra-low penetration oil field multistage plug compound voltage reducing extender, belong to ultra-low penetration oilfield chemistry step-down increase water injection technology field.
Background technology
The water injection pressure height has become the important factor of restriction water injection in low-permeability oilfield exploitation, not only causes formation damage, and affects the raising of oil field ultimate recovery factor.And the pressure-raising augmented injection is not the long-term plan of water injection in low-permeability oilfield exploitation, only has and controls the trend that water injection pressure rises, and carries out injected water transformation and step-down augmented injection work, and the waterflooding of low permeability oil field just has outlet.
The chemical antihypertensive augmented injection method of present domestic employing mainly comprises: the technical systems such as conventional acid (being mud acid) acidifying, retarded acid acidifying, notes tensio-active agent, swollen dose of notes contracting, thermochemistry augmented injection.But the ultra-low penetration oil field (refers to that rate of permeation is lower than 1 * 10
-3μ m
2Reservoir) distinguishing feature of waterflooding is that displacement pressure is high, between oil and water well, effectively driving pressure differential is little, oil well is subjected to of poor benefits, low yield poor efficiency well is more.
Facts have proved, traditional and single step-down increase water injection technology is in ultra-low penetration Oil Field application process, and is or too fast because of sour rock speed of response, and penetration range is short, causes that acidizing effect is not good and the measure validity period is short; Or because tensio-active agent is large in nearly well adsorptive capacity, make it not arrive well far away area, reduced the action effect of promoting agent; Or the chemical agent that injects and resident fluid are incompatible, and have produced new precipitation, cause the decline of rate of permeation; Thereby cause the measure success ratio low, validity period is short, and the result that rises does not on the contrary fall in even invalid or water injection pressure.
Summary of the invention
The object of the invention is to, provide a kind of with active retarded acid, complexing descaling agent, swollen dose of contracting and Scale inhibitors set in one, the mode that minute slug injects stage by stage; Can efficient solution except the obstruction on ultra-low penetration water injection well in oil fields stratum, make under-injected well reduce its water injection pressure when reaching injection allocation, replenish producing energy, improve the ultra-low penetration oil field multistage plug compound voltage reducing extender of oil recovery factor.
The present invention realizes above-mentioned purpose by the following technical solutions:
A kind of ultra-low penetration oil field multistage plug compound voltage reducing extender, it comprises active retarded acid, complexing descaling agent, contracting swollen dose and Scale inhibitors, it is characterized in that:
Described active retarded acid is by the feed composition of following weight parts:
5～10 parts of hydrochloric acid;
2～5 parts of Neutral ammonium fluorides;
2～5 parts of phosphoric acid;
5～8 parts of acetic acid;
2～5 parts of citric acids;
0.05～0.1 part of OP-4;
0.05～0.1 part of fluorocarbon surfactant FN-1;
2～5 parts of Virahols;
2～5 parts of butyl glycol ethers;
56.8～79.9 parts, water;
The preparation process of above-mentioned active retarded acid is: with the preparation of said components and water, and mix and obtain active retarded acid.
Described complexing descaling agent is by the feed composition of following weight parts:
15～20 parts of ethylenediamine tetraacetic acid (EDTA)s;
15～20 parts of diethylene triamine pentacetic acid (DTPA)s;
10～15 parts of end carboxyl polyamides amine polymers;
1～2 part of quadrol;
2～5 parts of hexamethylenetetramines;
5～8 parts, sodium hydroxide;
30～52 parts, water;
The preparation process of above-mentioned complexing descaling agent is: with the preparation of said components and water, and mix and obtain the complexing descaling agent.
Swollen dose of feed composition by following weight parts of described contracting:
10～15 parts of epoxy chloropropane;
10～15 parts of dimethyl diallyl ammonium chlorides;
10～15 parts of quadrols;
10～15 parts of dimethylamine;
0.5～1 part of ammonium persulphate;
0.5～1 part of sodium bisulfite;
Ice 38～59 parts;
The preparation process that above-mentioned contracting is swollen dose is: add ice in reactor, then in the situation that continuous the stirring first adds epoxy chloropropane and dimethyl diallyl ammonium chloride, then slowly add quadrol and dimethylamine, after being warming up to 60 ℃, add at last ammonium persulphate and sodium bisulfite, in 5 hours reaction times, obtain contracting swollen dose.
Described Scale inhibitors is by the feed composition of following weight parts:
15～25 parts of organic phosphine acids ATMP;
15～25 parts of HEDP;
25～35 parts of EDTMPS;
25～35 parts of DTPMPA;
The preparation process of above-mentioned Scale inhibitors is: said components is mixed obtain Scale inhibitors.
When the active retarded acid of above-mentioned ultra-low penetration oil field multistage plug compound voltage reducing extender, complexing descaling agent, swollen dose of contracting, Scale inhibitors injection, adopt minute slug to inject, a minute slug returns row, and each slug divides the injection on opportunity.Injection pressure is: lower than formation-parting pressure; Injection speed is: control discharge capacity at 200～350L/min.
The present invention's beneficial effect compared with prior art is:
This ultra-low penetration oil field multistage plug compound voltage reducing extender can effectively improve acidizing effect, remove the obstruction of the corresponding reservoir of ultra-low penetration water injection well in oil fields, reduce the water injection pressure of water injection well, prolongation measure validity period, improve the waterflooding development effect in ultra-low penetration oil field, thereby improve the recovery ratio in ultra-low penetration oil field.In May, 2009～2011 year October, adopt the present invention to celebrate respectively 4 ultra-low penetration oil reservoirs of oil field, Sinopec Jianghan Oil-field and Zhongyuan Oil Field CNPC head, 35 mouthfuls of water injection wells of 5 different layers positions have carried out Pilot trial, site test results shows: measure of the present invention is efficient reaches 91.3%, average individual well step-down reaches 1.5MPa, by the end of on May 31st, 2012, accumulative total augmented injection 63974m
3, measure effect is remarkable.
Embodiment
This ultra-low penetration oil field multistage plug compound voltage reducing extender employing in one, is carried out active retarded acid, complexing descaling agent, swollen dose of contracting and Scale inhibitors set by the mode that minute slug injects stage by stage.
Embodiment 1:
1, produce active retarded acid, complexing descaling agent, contracting swollen dose and Scale inhibitors.
Get 5 parts of hydrochloric acid, 2 parts of Neutral ammonium fluorides, 2 parts of phosphoric acid, 5 parts of acetic acid, 2 parts of citric acids, 0.05 part of OP-4,0.05 part of fluorocarbon surfactant FN-1,2 parts of Virahols, 2 parts of butyl glycol ethers, with said components and the preparation of 56.8 parts of water, and mix that to make active retarded acid standby.
Get 15 parts of ethylenediamine tetraacetic acid (EDTA)s, 15 parts of diethylene triamine pentacetic acid (DTPA)s, 10 parts of end carboxyl polyamides amine polymers, 1 part of quadrol, 2 parts of hexamethylenetetramines, 5 parts, sodium hydroxide, with said components and the preparation of 30 parts of water, and mix that to make the complexing descaling agent standby.
Get 10 parts of epoxy chloropropane, 10 parts of dimethyl diallyl ammonium chlorides, 10 parts of quadrols, 10 parts of dimethylamine, 0.5 part of ammonium persulphate, 0.5 part of sodium bisulfite, 38 parts, ice.Preparation process is: add ice in reactor, then in the situation that continuous the stirring first adds epoxy chloropropane and dimethyl diallyl ammonium chloride, then slowly add quadrol and dimethylamine, after being warming up to 60 ℃, add at last ammonium persulphate and sodium bisulfite, in 5 hours reaction times, obtain contracting swollen dose.
Get organic phosphine acids ATMP15 part, HEDP15 part, EDTMPS25 part, DTPMPA25 part.Said components is mixed to make active retarded acid standby.
Another key problem in technology of the active retarded acid of above-mentioned ultra-low penetration oil field multistage plug compound voltage reducing extender, complexing descaling agent, swollen dose of contracting and Scale inhibitors is: during implant operation, adopt minute slug discontinuity to inject, divide slug to return row, each slug divides inject opportunity; Injection pressure should be lower than formation-parting pressure; Injection speed is controlled discharge capacity at 200～350L/min.
during the on-the-spot use of this ultra-low penetration water injection well in oil fields multistage plug compound voltage reducing increase water injection technology, first active retarded acid is injected the stratum, remove reservoir choke, closing well after acid solution enters the stratum, react the row of returning after 2.5～4 hours, then inject the complexing descaling agent, remove the indissoluble dirt that acid solution can't corrosion, closing well after descaling agent enters the stratum, react the row of returning after 8～16 hours, clamp-on at last closing well after contracting swollen dose and Scale inhibitors, prevent the compatibility that the sensitive clay mineral expand and migrate and guarantee follow-up injected water and local water, Static Adsorption drives a well after 24～48 hours and normally produces.
Wherein the working concentration of each slug chemical agent (mass percent) and injection rate are respectively:
Active retarded acid: concentration 80～100%, injection rate 3～5m
3/ every rice bran oil layer thickness;
Complexing descaling agent: concentration 10～15%, injection rate 2～3m
3/ every rice bran oil layer thickness;
Swollen dose and Scale inhibitors contract: concentration 5～10%, injection rate 1～2m
3/ every rice bran oil layer thickness.
Embodiment 2:
1, produce active retarded acid, complexing descaling agent, contracting swollen dose and Scale inhibitors.
Get 10 parts of hydrochloric acid, 5 parts of Neutral ammonium fluorides, 5 parts of phosphoric acid, 8 parts of acetic acid, 5 parts of citric acids, 0.1 part of OP-4,0.1 part of fluorocarbon surfactant FN-1,5 parts of Virahols, 5 parts of butyl glycol ethers, with said components and the preparation of 79.9 parts of water, and mix that to make active retarded acid standby.
Get 20 parts of ethylenediamine tetraacetic acid (EDTA)s, 20 parts of diethylene triamine pentacetic acid (DTPA)s, 15 parts of end carboxyl polyamides amine polymers, 2 parts of quadrols, 5 parts of hexamethylenetetramines, 8 parts, sodium hydroxide, with said components and the preparation of 52 parts of water, and mix that to make the complexing descaling agent standby.
Get 15 parts of epoxy chloropropane, 15 parts of dimethyl diallyl ammonium chlorides, 15 parts of quadrols, 15 parts of dimethylamine, 1 part of ammonium persulphate, 1 part of sodium bisulfite, 59 parts, ice.Preparation process is: add ice in reactor, then in the situation that continuous the stirring first adds epoxy chloropropane and dimethyl diallyl ammonium chloride, then slowly add quadrol and dimethylamine, after being warming up to 60 ℃, add at last ammonium persulphate and sodium bisulfite, in 5 hours reaction times, obtain contracting swollen dose.
Get organic phosphine acids ATMP25 part, HEDP25 part, EDTMPS35 part, DTPMPA35 part.Said components is mixed to make active retarded acid standby.
Another key problem in technology of the active retarded acid of above-mentioned ultra-low penetration oil field multistage plug compound voltage reducing extender, complexing descaling agent, swollen dose of contracting and Scale inhibitors is: during implant operation, adopt minute slug discontinuity to inject, divide slug to return row, each slug divides inject opportunity; Injection pressure should be lower than formation-parting pressure; Injection speed is controlled discharge capacity at 200～350L/min.
during the on-the-spot use of this ultra-low penetration water injection well in oil fields multistage plug compound voltage reducing increase water injection technology, first active retarded acid is injected the stratum, remove reservoir choke, closing well after acid solution enters the stratum, react the row of returning after 2.5～4 hours, then inject the complexing descaling agent, remove the indissoluble dirt that acid solution can't corrosion, closing well after descaling agent enters the stratum, react the row of returning after 8～16 hours, clamp-on at last closing well after contracting swollen dose and Scale inhibitors, prevent the compatibility that the sensitive clay mineral expand and migrate and guarantee follow-up injected water and local water, Static Adsorption drives a well after 24～48 hours and normally produces.
Wherein the working concentration of each slug chemical agent (mass percent) and injection rate are respectively:
Active retarded acid: concentration 80～100%, injection rate 3～5m
3/ every rice bran oil layer thickness;
Complexing descaling agent: concentration 10～15%, injection rate 2～3m
3/ every rice bran oil layer thickness;
Swollen dose and Scale inhibitors contract: concentration 5～10%, injection rate 1～2m
3/ every rice bran oil layer thickness;
Practical application is given an example:
The application in long celebrating ultra-low penetration oil field, Zhenyuan X30～25 wells of this ultra-low penetration oil field multistage plug compound voltage reducing extender, the rate of permeation of this well development layer position is only 0.56 * 10
-3μ m
2, belong to the ultra-low penetration reservoir.
Injection rate to the compound voltage reducing extender of X30～25 wells is, active retarded acid (20000kg, working concentration 100%), complexing descaling agent (1500kg, working concentration 15%), swollen dose of (800kg contracts, working concentration 10%), Scale inhibitors (800kg, working concentration 10%).
Concrete injection technology flow process at the scene is: (Static Adsorption 30 hours) → normal water filling drives a well for active water well-flushing → inject active retarded acid (reacting 3.5 hours) → row of returning → injection complexing descaling agent (reacting 12 hours) → row of returning → swollen dose of injection contracting and Scale inhibitors.During the row of returning, under well head and pipeline load rated safety pressure, suitably strengthened discharge capacity, be convenient to reaction residues and thoroughly wash out, removed and stop up.
Conclusion after use: X30-25 well injected water and local water are incompatible, and the employing general measures is invalid or validity period is short.Before employing the present invention injects measure, injection pressure 21.0MPa, injection allocation amount 25.0m
3/ day, actual water filling 15m
3/ day.After adopting this ultra-low penetration oil field multistage plug compound voltage reducing extender to divide the measure that the slug discontinuity injects, water injection pressure is down to 17.0MPa, water injection rate 26 m
3/ day, water injection pressure has reduced 4.0MPa before adopting measure of the present invention, and makes this well reach the injection allocation requirement, and measure effect is obvious, and the measure validity period is more than 300 days.
The above is the embodiment of this invention, above-mentioned not illustrating is construed as limiting flesh and blood of the present invention, the person of an ordinary skill in the technical field can make an amendment or be out of shape above-mentioned embodiment after having read this specification sheets, and does not deviate from the spirit and scope of the invention.
Claims (1)
1. ultra-low penetration oil field multistage plug compound voltage reducing extender, it comprises active retarded acid, complexing descaling agent, contracting swollen dose and Scale inhibitors, it is characterized in that:
Described active retarded acid is by the feed composition of following weight parts:
5～10 parts of hydrochloric acid;
2～5 parts of Neutral ammonium fluorides;
2～5 parts of phosphoric acid;
5～8 parts of acetic acid;
2～5 parts of citric acids;
0.05～0.1 part of OP-4;
0.05～0.1 part of fluorocarbon surfactant FN-1;
2～5 parts of Virahols;
2～5 parts of butyl glycol ethers;
56.8～79.9 parts, water;
The preparation process of above-mentioned active retarded acid is: with the preparation of said components and water, and mix and obtain active retarded acid;
Described complexing descaling agent is by the feed composition of following weight parts:
15～20 parts of ethylenediamine tetraacetic acid (EDTA)s;
15～20 parts of diethylene triamine pentacetic acid (DTPA)s;
10～15 parts of end carboxyl polyamides amine polymers;
1～2 part of quadrol;
2～5 parts of hexamethylenetetramines;
5～8 parts, sodium hydroxide;
30～52 parts, water;
The preparation process of above-mentioned complexing descaling agent is: with the preparation of said components and water, and mix and obtain the complexing descaling agent;
Swollen dose of feed composition by following weight parts of described contracting:
10～15 parts of epoxy chloropropane;
10～15 parts of dimethyl diallyl ammonium chlorides;
10～15 parts of quadrols;
10～15 parts of dimethylamine;
0.5～1 part of ammonium persulphate;
0.5～1 part of sodium bisulfite;
Ice 38～59 parts;
The preparation process that above-mentioned contracting is swollen dose is: add ice in reactor, then in the situation that continuous the stirring first adds epoxy chloropropane and dimethyl diallyl ammonium chloride, then slowly add quadrol and dimethylamine, after being warming up to 60 ℃, add at last ammonium persulphate and sodium bisulfite, in 5 hours reaction times, obtain contracting swollen dose;
Described Scale inhibitors is by the feed composition of following weight parts:
15～25 parts of organic phosphine acids ATMP;
15～25 parts of HEDP;
25～35 parts of EDTMPS;
25～35 parts of DTPMPA;
The preparation process of above-mentioned Scale inhibitors is: said components is mixed obtain Scale inhibitors;
When the active retarded acid of above-mentioned ultra-low penetration oil field multistage plug compound voltage reducing extender, complexing descaling agent, swollen dose of contracting and Scale inhibitors inject, adopt minute slug to inject, a minute slug returns row; Injection pressure is: lower than formation-parting pressure; Injection speed is: control discharge capacity at 200～350L/min.
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