CN102775980A - Acidizing block remover suitable for complex lithologic reservoir - Google Patents
Acidizing block remover suitable for complex lithologic reservoir Download PDFInfo
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Abstract
The invention relates to an acidizing block remover suitable for a complex lithologic reservoir. The acidizing block remover suitable for the complex lithologic reservoir comprises the following components by weight: 0-12% of hydrochloric acid, 0-3% of ammonium bifluoride, 0-10% of sulfamic acid, 0-5% of fluoboric acid, 0-3% of boric acid, 0-4% of alcohol, 0-2% of triethanolamine, 3% of glacial acetic acid, 4.0-6.0% of corrosion inhibitor, 2.0-4.0% of mutual solvent, 0.5-1.0% of penetrating agent, 2.0% of clay stabilizer and 45-88.5% of water. The problems that the lithologic and physical property differences of oil fields are large, the oil fields are in staggered distribution, and the acidizing debugging construction effect of a common water injection well is not ideal are mainly solved. The acidizing block remover suitable for the complex lithologic reservoir can effectively corrode the strata minerals and obstruent, does not destroy a rock skeleton, can prevent secondary precipitation caused by sensitive mineral, improves the water absorbing capacity of the reservoir, and increases the daily increasing water injection rate of an average single-well measure.
Description
Technical field:
The present invention relates to a kind of unblocking agent in the oil recovery field, oil field, especially a kind of complex lithology reservoir acidification blocking remover that is applicable to.
Background technology:
" injecting enough water, injecting good water " directly determining the oil-field development effect.To the WIW of water filling difficulty, the acidification to dispel block measure is generally adopted in the oil field, promptly in WIW, injects acidification blocking remover, the dissolving tamper, and the mediation reservoir pore space, thus realize improving the reservoir water-retaining capacity.And it is poor for reservoir properties; Shale index is high, and lithology, clay mineral content differ greatly, the unconspicuous this oil field of clay mineral regularity of distribution complex lithology block; Such as block reservoir for minute two sections; Top series of strata porosity, rate of permeation are all lower, and illite/smectite mixed layer and blotite content are higher in the clay mineral, are prone to take place water-sensitive and acid-sensitive; Bottom series of strata porosity, rate of permeation are higher, and kaolinite content increases gradually in the clay mineral, and it is quick and acid-sensitive to be prone to that speed takes place; Oil reservoir travertine and clay mineral content are higher, cause the reservoir loose cementation, water-sensitive, fast quick serious in the injecting process, reservoir water filling difficulty.Therefore because this complex lithology block, lithology, physical difference are bigger, and are interspersed, and have brought great difficulty to acidizing treatment.Use the common acidizing fluid of conventional waterflood well acidizing unblocking agent, the augmented injection effect is undesirable, is keeping under original water injection pressure, and average individual well day augmented injection has only 5.0m
3
Summary of the invention:
The invention reside in and overcome the big and unfavorable problem of use conventional waterflood well acidizing de-plugging construction effect that is interspersed that exists in the background technology for oil field lithology, physical difference; And a kind of complex lithology reservoir acidification blocking remover that is applicable to is provided; This is applicable to that the complex lithology reservoir acidification blocking remover has formed the stronger serial acid fluid system of specific aim; I.e. effectively corrosion stratum mineral and tamper; Do not destroy the rock stratum skeleton again, the secondary sedimentation that can prevent the susceptibility mineral to cause generates, and improves the oil reservoir water-retaining capacity.
The present invention solves its problem and can reach through following technical scheme: this is applicable to the complex lithology reservoir acidification blocking remover; Its component and proportioning are following by weight percentage: hydrochloric acid 0～12%, matt salt 0%～3%, thionamic acid 0%-10%, fluoroboric acid 0%～5%, boric acid 0%-3%, ethanol 0～4%, trolamine 0～2%, Glacial acetic acid min. 99.5 3%, inhibiter 4.0～6.0%, mutual solvent 2.0～4.0%, permeate agent 0.5～1.0%, clay stabilizer 2.0%, water 45～88.5%.。
Described hydrochloric acid 10～12%, matt salt 1%～3%, thionamic acid 8%-10%, fluoroboric acid 3%～5%, boric acid 2%-3%, ethanol 2～4%, trolamine 1～2%, Glacial acetic acid min. 99.5 3%, inhibiter 4.0～6.0%, mutual solvent 2.0～4.0%, permeate agent 0.5～1.0%, clay stabilizer 2.0%, water 45～61.5%.
Also comprise Hydrocerol A 0.5～1.0%, powder nitric acid 5～7% in the described acidification to dispel block agent prescription.
Described mutual solvent is an ethylene glycol monobutyl ether; Permeate agent is the nonionogenic tenside TX10; Clay stabilizer is for to be formed by 2:1 is composite by 3-chloro-2-hydroxypropyl trimethyl ammonium chloride and ammonium chloride.。
Described inhibiter is formed by 1:2:1 is composite by hexamethylenetetramine, formaldehyde and thiocarbamide.
Complex lithology acidification blocking remover of the present invention is primarily aimed at loose, the high characteristics of shale index of oilfield reservoir, has studied by multiple acid solution and is fit to the compound acid fluid system that strong quick property reservoir additive is formed.The main effect of hydrochloric acid is the pH value that keeps lower in the main acid system, prevents secondary precipitate, and another mainly acts on the generation of promotion hydrofluoric acid and reacts with the sandstone mineral.Matt salt, fluoroboric acid and boric acid are under the hydrochloric acid effect; Generate the hydrofluoric acid of low concentration; Dissolving formation pore medium clay soil, this acid fluid system have overcome regular mud acid reaction gluing fast, the short and higher corrosion ability destructible rock of operating distance in the stratum.Simultaneously, penetrable because this acid fluid system has low reaction activity to the depths, stratum, and can avoid fine migration.Thionamic acid is an organic acid, has dirt grain effect in the dissolving formation pore.The alcoholic acid effect is to reduce sour rock speed of response, and the effect of a speed of response that delays is provided.Glacial acetic acid min. 99.5 has delayed the generation of sial dirt through cushioning effect and chelate effect.Trolamine is with Fe
3+Complexing prevents after the acidifying iron deposition and permeability reduction to take place.
The complex lithology acidification blocking remover mechanism of action of the present invention is the pollution in dissolving obstruction or bridging plug matrix pores duct on the stratum, recovers the prime stratum rate of permeation.This system is made up of mineral acid, organic acid and acid additive.After acid solution gets into the stratum, mineral acid at first with the stratum in the mineral reaction, suppressed organic acid ionization, the slow ionization of organic acid, thereby this acid system is among the big activity all the time, reach slow and deep acidifying purpose.In addition, this acid system can be separated the organic contamination of paraffin removal, pitch, mushroom formation.
The present invention and above-mentioned background compared with techniques can have following beneficial effect: this is applicable to the complex lithology reservoir acidification blocking remover, and promptly effectively corrosion stratum mineral and tamper do not destroy the rock stratum skeleton again; The secondary sedimentation that can prevent the susceptibility mineral to cause generates; Prevent swelling clay mineral and particle migration, can prevent stratum emulsification simultaneously, strengthen the wettability on stratum, guarantee acidizing effect; Improve the oil reservoir water-retaining capacity, increase the average single well measure water injection rate that increases day by day.Average individual well water injection pressure decline 1.5MPa behind application the present invention, average individual well day augmented injection 13.5m
3
Embodiment:
To combine specific embodiment that the present invention is described further below:
The used mutual solvent of following embodiment is an ethylene glycol monobutyl ether; Permeate agent is the nonionogenic tenside TX10; Clay stabilizer is for to be formed by 2:1 is composite by 3-chloro-2-hydroxypropyl trimethyl ammonium chloride and ammonium chloride; Inhibiter is formed by 1:2:1 is composite by hexamethylenetetramine, formaldehyde and thiocarbamide.
Embodiment 1:
Take by weighing hydrochloric acid 10g, matt salt 1g, boric acid 2g, Glacial acetic acid min. 99.5 3g, inhibiter 4.0g, mutual solvent ethylene glycol monobutyl ether 2.0g, permeate agent TX10 0.5g, clay stabilizer 2.0g and water 75.5g and be hybridly prepared into acidification blocking remover.
This acidification blocking remover is applicable to the acidification to dispel block agent prescription of the anti-compound acid fluid system of water-sensitive of low injury.These acid fluid system characteristics are to be effective corrosion stratum mineral and tamper; Do not destroy the rock stratum skeleton again, the secondary sedimentation that can prevent the susceptibility mineral to cause generates, and prevents swelling clay mineral and particle migration; Can prevent simultaneously stratum emulsification, strengthen the wettability on stratum, guarantee acidizing effect.
Embodiment 2:
Take by weighing thionamic acid 8g, matt salt 2g, Hydrocerol A 0.5g, inhibiter 4.0g, mutual solvent 2.0g, permeate agent 0.5g, clay stabilizer 2.0g and water 81.0g and be hybridly prepared into acidification blocking remover.
This acidification blocking remover is applicable to and is prone to take place the acid-sensitive series of strata of hydrochloric acid.
Embodiment 3:
Take by weighing hydrochloric acid 10g, fluoroboric acid 3g, ethanol 2g, trolamine 1g, inhibiter 4.0g, mutual solvent 2.0g, permeate agent 0.5g, clay stabilizer 3.0g and water 74.5g and be hybridly prepared into acidification blocking remover.
This acidification blocking remover is applicable to that Xing'an Mountains crowd contains the low injury of travertine reservoir, the anti-compound acid fluid system of swollen and anti-migration type.These acid fluid system characteristics are higher to Xing'an Mountains oil reservoir smectite and travertine content; Has the dual water-sensitive characteristic of water-swellable and clay movement; Guaranteeing effective corrosion stratum mineral and tamper, can prevent swelling clay mineral and particle migration, satisfied such reservoir acidifying needs.
Embodiment 4:
Take by weighing hydrochloric acid 3g, powder nitric acid 5g, Glacial acetic acid min. 99.5 3g, inhibiter 4.0g, mutual solvent 2.0g, permeate agent 0.5g, clay stabilizer 2.0g and water 80.5g and be hybridly prepared into acidification blocking remover.This acidification blocking remover is applicable to and is prone to take place the acid-sensitive series of strata of mud acid.
This acidification blocking remover performance evaluation:
⑴ effectively corrosion stratum mineral and tamper, does not destroy the rock stratum skeleton again, and table 1 is the acidification blocking remover test oil field block landwaste corrosion experimental data table of the formulation of application implementation example 2-4.
Table 1 oil field block landwaste corrosion experimental data table
⑵ the secondary sedimentation that can prevent the susceptibility mineral to cause generates, and prevents swelling clay mineral and particle migration, can prevent stratum emulsification simultaneously, strengthen the wettability on stratum, guarantees acidizing effect, the acid solution over-all properties table of this acidification blocking remover of table 2.
Table 2 acid solution over-all properties table
| Secondary sedimentation | Demulsification efficiency (%) | IT (mN/m) | Erosion rate (g/m 3.h） |
| PH=6.5 does not have deposition | 15min/≥95% | 1.0～2.0 | <1.0 |
⑶ rock core displacement test data show, can effectively improve drill core permeability rate, satisfy oil field different blocks acidizing treatment needs, and table 3 is the rock core displacement test data of the acidification blocking remover of application prescription 2-4 preparation.
Table 3 rock core displacement test data
Use acidification blocking remover of the present invention that 25 intervals of 12 mouthfuls of wells of Hailaer, oil field, Hailaer particular lithologic reservoir different blocks have been carried out site operation, with sour total amount 1362m
3, acidization of sandstone thickness 289m, average unit thickness is with acid amount 4.71m
3/ m.All see the augmented injection effect after 12 mouthfuls of well measures of acidifying, accomplish injection allocation after 10 mouthfuls of well measures are wherein arranged.Add up 12 mouthfuls of wells, average individual well water injection pressure decline 1.5MPa, average individual well day augmented injection 13.5m
3, add up augmented injection 2022m at present
3Table 4 is Hailaer field use acidification blocking remover acidifying of the present invention service shaft statistical effect table in 2011.Table 5 is the common acidifying construction effect of Hailaer Oilfield using tables.
Table 4 Hailaer in 2011 acidification of oil field service shaft statistical effect table
Oil field, table 5 Hailaer common acidifying construction effect table
Claims (5)
1. one kind is applicable to the complex lithology reservoir acidification blocking remover; Its component and proportioning are following by weight percentage: hydrochloric acid 0～12%, matt salt 0%～3%, thionamic acid 0%～10%, fluoroboric acid 0%～5%, boric acid 0%～3%, ethanol 0～4%, trolamine 0～2%, Glacial acetic acid min. 99.5 3%, inhibiter 4.0～6.0%, mutual solvent 2.0～4.0%, permeate agent 0.5～1.0%, clay stabilizer 2.0%, water 45～88.5%.
2. a kind of complex lithology reservoir acidification blocking remover that is applicable to according to claim 1; It is characterized in that: described hydrochloric acid 10～12%, matt salt 1%～3%, thionamic acid 8%～10%, fluoroboric acid 3%～5%, boric acid 2%～3%, ethanol 2～4%, trolamine 1～2%, Glacial acetic acid min. 99.5 3%, inhibiter 4.0～6.0%, mutual solvent 2.0～4.0%, permeate agent 0.5～1.0%, clay stabilizer 2.0%, water 45～61.5%.
3. a kind of complex lithology reservoir acidification blocking remover that is applicable to according to claim 1 is characterized in that: also comprise Hydrocerol A 0.5～1.0%, powder nitric acid 5～7% in the described acidification to dispel block agent prescription.
4. according to claim 1 or 2 or 3 described a kind of complex lithology reservoir acidification blocking removers that are applicable to, it is characterized in that: described mutual solvent is an ethylene glycol monobutyl ether; Permeate agent is the nonionogenic tenside TX10; Clay stabilizer is for to be formed by 2:1 is composite by 3-chloro-2-hydroxypropyl trimethyl ammonium chloride and ammonium chloride.
5. according to claim 1 or 2 or 3 described a kind of complex lithology reservoir acidification blocking removers that are applicable to, it is characterized in that: described inhibiter is formed by 1:2:1 is composite by hexamethylenetetramine, formaldehyde and thiocarbamide.
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