CN103881674A - Combined blocking remover for polymer injection blocking well section plug and preparation method and application of combined blocking remover - Google Patents
Combined blocking remover for polymer injection blocking well section plug and preparation method and application of combined blocking remover Download PDFInfo
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- CN103881674A CN103881674A CN201310492658.4A CN201310492658A CN103881674A CN 103881674 A CN103881674 A CN 103881674A CN 201310492658 A CN201310492658 A CN 201310492658A CN 103881674 A CN103881674 A CN 103881674A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- 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
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- 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
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- 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
- C09K8/532—Sulfur
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/26—Gel breakers other than bacteria or enzymes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/32—Anticorrosion additives
Abstract
The invention discloses a combined blocking remover for a polymer injection blocking well section plug and a preparation method and application of the combined blocking remover, belonging to the technical field of tertiary oil recovery. The blocking remover comprises a blocking remover for an oxidizing and gel breaking section plug consisting of the following components in percentage by weight: 10-20 percent of sodium percarbonate, 1-2 percent of active agent, 0.5-2 percent of corrosion inhibitor, 2-5 percent of mutual solvent and the balance of water. According to the combined blocking remover for the polymer injection blocking well section plug, the blocking remover for the oxidizing and gel breaking section plug has the characteristics of high oxidizing and gel breaking rate, low corrosion and high safety. The oxidative decomposition and gel breaking rate on polyacrylamide and a cross-linking polymer gel system thereof which are commonly used in oilfield polymer flooding is over 96 percent, and the corrosion rate detected by adopting an N80 steel sheet standard test piece is 1g/m2.h below. After the polymer injection well blockage is decomposed and subjected to gel breaking, the original viscous black blockage is changed into a transparent aqueous solution, the blocking remover is high in liquidity and low in residue rate, the polymer injection well formation plugging can be efficiently removed, and the aims of removing blockage and increasing injection are achieved.
Description
Technical field
The present invention is specifically related to the poly-obstruction of a kind of note well slug combination unblocking agent, and the preparation method of this combination unblocking agent and application, belongs to tertiary oil recovery technology field.
Background technology
Polymer displacement of reservoir oil tech is the crude oil for inhibiting production rate decline of water flooding later stage and the further dominant technology measure of raising recovery ratio.But, in polymer flooding process, because the effects such as absorption, delay and the machinery trapping of polymkeric substance in the porous medium of stratum very easily cause injection well reservoir choke.In polymer flooding process in order to suppress polymkeric substance channelling, expand the swept volume of polymkeric substance, conventionally before polymer flooding, different steps adopts polymer gel to carry out profile control in polymer flooding and after polymer flooding etc., further aggravated the reservoir choke of injection well, and reservoir choke radius expands earth formation deep to by immediate vicinity of wellbore.After polymer in injection wells, stratum liquid absorption generally declines, polymer-injecting pump is pressed higher, cause the injection rate injection of polymer solution that injection well can not be on request, stop up serious injection well note and do not enter polymkeric substance and can only stop note by closing well, have a strong impact on polymer flooding effect and field produces.
By finding noting the sampling analysis of poly-obstruction well site work reverse flow stuff, injection well reservoir choke thing is black visco-elasticity jelly, mainly formed by water, greasy dirt, polymkeric substance and cross linked gel thereof, silt particle and other inorganic impurity etc., these materials are bundled together alternately, after dehydrating, be rubber shape, if do not adopt chemical process, each component is difficult to effectively separately.From the isolated liquid of tamper, also contain a large amount of sulphate reducing bacterias, they can be reduced to hydrogen sulfide by the sulfate ion in solution, and then erode downhole iron and steel tubing string produces Iron sulfuret precipitation obstruction injection well.Therefore, polymer in injection wells is that the complex system being made up of organism and inorganics causes jointly, its unblocking and injection increasing, not only will solution degrease and obstruction that the organism such as polymkeric substance and cross linked gel thereof causes, need efficient solution to remove the reservoir choke thing that the inorganics such as silt particle, Iron sulfuret causes simultaneously, and kill the sulphate reducing bacteria that may cause follow-up obstruction.
In addition, take effect 3～4 years even longer time of the common injection of polymer solution of injection well flatly, in very long injection process, absorption, delay and the machinery trapping inevitable deep that by immediate vicinity of wellbore be gradually deep into stratum of polymkeric substance in the porous medium of stratum, cause earth formation deep to stop up, simultaneously, the whole process profile control measure extensively adopting in order to suppress polymkeric substance channelling in polymer flooding process, further aggravated earth formation deep obstruction, this just requires to note the poly-plug removal radius that stops up well must reach certain degree of depth.
At present, the poly-following technical problem of well block releasing technique ubiquity of stopping up of the note of domestic employing: the one, ignore the complicacy of polymer in injection wells thing, only focus on the development and application to polymkeric substance and cross linked gel tamper de-plugging chemical agent thereof, ignore greasy dirt and various inorganic tamper is also the major reason that causes reservoir choke, or do not consider the physicochemical property difference of various tampers, various unblocking agents are generally injected to de-plugging, chemical agent is difficult to effective contact reacts with corresponding tamper, plugging removal effect conventionally and shop experiment effect differ greatly; The 2nd, to rigidly adhere in the inertial thinking of nearly well de-plugging, plug removal radius conventionally design, at 2～3 meters, has been ignored the characteristic that the poly-obstruction of note well depth portion stops up, and does not reach the object of removing clog in deep reservoir.
Summary of the invention
The object of this invention is to provide the poly-well slug combination unblocking agent that stops up of a kind of note.
Meanwhile, the present invention also provides a kind of poly-preparation method who stops up well slug combination unblocking agent that notes.
Finally, the present invention also provides a kind of poly-application of well slug combination unblocking agent in de-plugging polymer in injection wells stratum of stopping up of noting.
In order to realize above object, the technical solution adopted in the present invention is:
The poly-well slug combination unblocking agent that stops up of a kind of note, comprise the broken glue slug unblocking agent of oxidation, the broken glue slug unblocking agent of described oxidation is made up of the component of following weight percentage: SPC-D 10～20%, promoting agent 1～2%, inhibiter 0.5～2%, mutual solvent 2～5%, surplus is water.This slug is mainly used in oxidative degradation causes the main tamper such as polymkeric substance and cross-linked polymer gel of polymer in injection wells, is poly-key and the core slug that stops up well de-plugging of note.
Described activator is mainly made up of phosphoric acid salt and highly basic, and it act as the potential of hydrogen of the hierarchy of control.Wherein, phosphoric acid salt preferably phosphoric acid calcium dihydrogen, the preferred potassium hydroxide of highly basic, is commercially available industrial goods.
Described inhibiter is the anti-oxidation inhibiter of iron and steel, is commercial goods.Can adopt the anti-oxidation inhibiter of JHS-1 shaped steel iron, be provided by petrochemical complex institute of China University Of Petroleum Beijing.
Described mutual solvent is ethanol.
The poly-well slug combination unblocking agent that stops up of a kind of note, comprises pre-treatment slug unblocking agent, and described pre-treatment slug unblocking agent is made up of the component of following weight percentage: JHB-1 type High-efficiency oil displacement agent 2～5%, ammonium chloride 1～2%, surplus is water.This slug is mainly used in removing the greasy dirt of tamper surface and immediate vicinity of wellbore, the tamper such as polymkeric substance and cross-linked polymer gel is come out, so that the abundant contact reacts of oxidation gel breaker with follow-up slug, improve the broken glue of oxidation and plugging removal effect, simultaneously, pre-treatment slug can also be removed local water lock and reduce capillary pulling power, reduces follow-up injection pressure.
Described JHB-1 type High-efficiency oil displacement agent is nonionogenic tenside, has ultra low interfacial tension, is commercially available industrial goods
The poly-well slug combination unblocking agent that stops up of a kind of note, comprise rearmounted synergy slug unblocking agent, described rearmounted synergy slug unblocking agent is made up of the component of following weight percentage: Textone 5～10%, citric acid 10～20%, fluoroboric acid 5～6%, ammonium bifluoride 2～3%, ammonium chloride 1～2%, JHB-1 type High-efficiency oil displacement agent 2～3%, inhibiter 0.5～2%, mutual solvent 2～5%, surplus is water.This slug can react and generate dioxide peroxide and hydrogen fluoride, the effectively various inorganic tampers of stabilized and corrosion under formation condition.
Described JHB-1 type High-efficiency oil displacement agent, inhibiter, mutual solvent are the same.
Pre-treatment slug unblocking agent in the present invention, the broken glue slug unblocking agent of oxidation, rearmounted synergy slug unblocking agent can play a role separately, also can be used in conjunction with the conventional slug unblocking agent in this area respectively, also can from above-mentioned three, select two or three to be used in conjunction with arbitrarily simultaneously.Wherein, the concrete consumption of pre-treatment slug unblocking agent, the broken glue slug unblocking agent of oxidation, rearmounted synergy slug unblocking agent calculates according to the reservoir characteristics parameter of construction well and production current intelligence.
Preferably, the poly-well slug combination unblocking agent that stops up of a kind of note, comprise pre-treatment slug unblocking agent, the broken glue slug unblocking agent of oxidation and rearmounted synergy slug unblocking agent, described pre-treatment slug unblocking agent is made up of the component of following weight percentage: JHB-1 type High-efficiency oil displacement agent 2～5%, ammonium chloride 1～2%, surplus is water, the broken glue slug unblocking agent of described oxidation is made up of the component of following weight percentage: SPC-D 10～20%, promoting agent 1～2%, inhibiter 0.5～2%, mutual solvent 2～5%, surplus is water, described rearmounted synergy slug unblocking agent is made up of the component of following weight percentage: Textone 5～10%, citric acid 10～20%, fluoroboric acid 5～6%, ammonium bifluoride 2～3%, ammonium chloride 1～2%, JHB-1 type High-efficiency oil displacement agent 2～3%, inhibiter 0.5～2%, mutual solvent 2～5%, surplus is water.
Note a poly-preparation method who stops up well slug combination unblocking agent, comprise the following steps:
The preparation method of the described broken glue slug unblocking agent of oxidation is: accurately get each component according to weight percentage, stir and add SPC-D, promoting agent to dissolving completely in water, then stirring adds mutual solvent, inhibiter to dissolving completely and get final product successively.
The preparation method of described pre-treatment slug unblocking agent is: accurately get each component according to weight percentage, in water, stir and add JHB-1 type High-efficiency oil displacement agent, ammonium chloride successively, continue to be stirred to and dissolve completely and get final product.
The preparation method of described rearmounted synergy slug unblocking agent is: accurately get each component according to weight percentage, in water, stir and add Textone to dissolving completely, stir and add citric acid, fluoroboric acid, ammonium bifluoride, ammonium chloride, JHB-1 type High-efficiency oil displacement agent, inhibiter and mutual solvent successively again, continue to be stirred to and dissolve completely and get final product.
Note the poly-application of well slug combination unblocking agent in de-plugging polymer in injection wells stratum of stopping up, comprise the following steps: first pre-treatment slug unblocking agent is clamp-oned to de-plugging zone of interest, closing well reaction 3～5 hours; Again broken oxidation glue slug unblocking agent is clamp-oned to zone of interest, closing well reaction 20～28 hours; Finally rearmounted synergy slug unblocking agent is clamp-oned to zone of interest, water filling is amplified in closing well reaction after 26～34 hours can proceed to normal note consor product for 2～4 days.
Beneficial effect of the present invention:
The broken glue slug unblocking agent of oxidation of injection well slug combination unblocking agent of the present invention has the broken feature that glue rate is high, corrodibility is low and security is good of oxidation.It all more than 96%, adopts erosion rate that N80 steel disc standard specimen detects at 1g/m to the broken glue rate of the oxygenolysis of the conventional polyacrylamide of oilfield polymer flooding and cross-linked polymer gel system thereof
2below h.Polymer in injection wells thing decomposes and breaks after glue through its oxidation gel breaker, and originally the gluey black tamper of thickness becomes transparent aqueous solution, and good fluidity and residue rate are low, can efficiently remove injection well reservoir choke, realize unblocking and injection increasing object.
The pre-treatment slug unblocking agent of injection well slug combination unblocking agent of the present invention adopts complexed surfactant, and its interfacial tension is less than 1.5 × 10
-4mN/m, washing oil rate is more than 95%, there is ultra low interfacial tension and the high characteristic of washing oil detersive efficiency, poly-stop up black visco-elasticity tamper that well takes after its immersion and cleaning from noting, the greasy dirt on tamper surface is removed efficiently, the tamper such as polymkeric substance and cross-linked polymer gel and inorganic impurity in tamper are exposed, and make itself and the oxidation of the broken glue slug of oxidation break more fully contact reacts of glue, improve de-plugging efficiency.In addition, pre-treatment slug also has solution and degreases and stop up and reduce the function of follow-up slug injection pressure.
The rearmounted synergy slug unblocking agent of injection well slug combination unblocking agent of the present invention has kills the effect that can corrode steel equipment and produce the inorganic tampers such as Iron sulfuret tamper sulphate reducing bacteria, oxygenolysis Iron sulfuret, corrosion silt particle.This slug generates the efficiently chlorine dioxide bactericide of stabilized and oxygenolysis Iron sulfuret tamper under formation condition, its to the killing rate of sulphate reducing bacteria more than 99%, to the oxygenolysis rate of Iron sulfuret tamper more than 98%; This slug can generate hydrofluoric acid and the hydrochloric acid mixed solution silt particle to efficient corrosion effect under formation condition, with the component such as fluoroboric acid synergy, has the function of the inorganic tampers such as corrosion silt particle.
The method that the present invention prepares injection well slug combination unblocking agent is simple, easy to operate, is suitable for suitability for industrialized production and rig-site utilization.
The present invention notes the poly-well slug combination unblocking agent that stops up and is combined by pre-treatment slug unblocking agent, the broken glue slug unblocking agent of oxidation, rearmounted synergy slug unblocking agent, each slug synergy, can efficiently remove by greasy dirt, polymkeric substance, cross-linked polymer gel and various inorganic impurity and mutually wrap up and form the gluey tamper of visco-elasticity, realize and stop up injection well unblocking and injection increasing object.
The present invention notes the poly-application of well slug combination unblocking agent in de-plugging polymer in injection wells stratum of stopping up, and adopts deep injection technology method step by step from the close-by examples to those far off to squeeze polymer in injection wells stratum.When de-plugging is constructed at the scene, first inject pre-treatment slug unblocking agent and remove the greasy dirt of tamper surface and immediate vicinity of wellbore, the tamper such as polymkeric substance and cross-linked polymer gel is come out, so that the abundant contact reacts of oxidation gel breaker with follow-up slug, simultaneously, remove local water lock and reduce capillary pulling power, reducing follow-up injection pressure; Then inject the broken glue slug unblocking agent of oxidation, the oxidation gel breaker of this slug is oxidized brokenly with the above-mentioned tamper such as polymkeric substance and cross-linked polymer gel coming out that glue reacts and by its exhaustive oxidation decomposition, remove the obstruction that it causes stratum; Finally inject rearmounted synergy slug, this slug is identical with the dosage of the broken glue slug of oxidation, to be oxidized brokenly on the one hand glue obstruction continues to advance to earth formation deep, the remaining composition that makes full use of pre-treatment slug and the broken glue slug of oxidation, expands plug removal radius, realizes removing clog in deep reservoir object step by step, simultaneously, rearmounted synergy slug unblocking agent also has the inorganic tampers such as stabilized, oxygenolysis Iron sulfuret and corrosion silt particle and stratum matrix, removes inorganic tamper, further improves plugging removal effect.
Embodiment
Following embodiment is only described in further detail the present invention, but does not form any limitation of the invention.
Embodiment 1
The poly-well slug combination unblocking agent that stops up of note in the present embodiment comprises pre-treatment slug unblocking agent, the broken glue slug unblocking agent of oxidation and rearmounted synergy slug unblocking agent.Wherein, pre-treatment slug unblocking agent is made up of the component of following weight percentage: JHB-1 type High-efficiency oil displacement agent 5%, ammonium chloride 2%, and surplus is water; The broken glue slug unblocking agent of oxidation is made up of the component of following weight percentage: SPC-D 20%, promoting agent 2%, the anti-oxidation inhibiter 2% of JHS-1 shaped steel iron, ethanol 5%, and surplus is water; Rearmounted synergy slug unblocking agent is made up of the component of following weight percentage: Textone 10%, citric acid 20%, fluoroboric acid 6%, ammonium bifluoride 3%, ammonium chloride 1%, JHB-1 type High-efficiency oil displacement agent 3%, the anti-oxidation inhibiter 2% of JHS-1 shaped steel iron, ethanol 5%, surplus is water.
The poly-preparation method who stops up well slug combination unblocking agent of note in the present embodiment, comprises the following steps:
The preparation method of the described broken glue slug unblocking agent of oxidation is: accurately get each component according to weight percentage, in water, stir and add SPC-D, promoting agent to dissolving completely, then stir and add the anti-oxidation inhibiter of JHS-1 shaped steel iron, ethanol to solution are homogeneous transparent shape and get final product successively;
The preparation method of described pre-treatment slug unblocking agent is: accurately get each component according to weight percentage, in water, stir and add JHB-1 type High-efficiency oil displacement agent, ammonium chloride successively, continue to be stirred to solution and be homogeneous transparent shape and get final product;
The preparation method of described rearmounted synergy slug unblocking agent is: accurately get each component according to weight percentage, in water, stir and add Textone to dissolving completely, stir and add citric acid, fluoroboric acid, ammonium bifluoride, ammonium chloride, JHB-1 type High-efficiency oil displacement agent, the anti-oxidation inhibiter of JHS-1 shaped steel iron and ethanol successively again, continue to be stirred to solution and be homogeneous transparent shape and get final product.
In the present embodiment, the application of the poly-obstruction of note well slug combination unblocking agent in de-plugging polymer in injection wells stratum, comprises the following steps: first pre-treatment slug unblocking agent is clamp-oned to de-plugging zone of interest, closing well reaction 4 hours; Again broken oxidation glue slug unblocking agent is clamp-oned to zone of interest, closing well reaction 24 hours; Finally rearmounted synergy slug unblocking agent is clamp-oned to zone of interest, water filling is amplified in closing well reaction after 30 hours can proceed to normal note consor product for 6 days.
Embodiment 2
The poly-well slug combination unblocking agent that stops up of note in the present embodiment comprises pre-treatment slug unblocking agent, the broken glue slug unblocking agent of oxidation and rearmounted synergy slug unblocking agent.Wherein, pre-treatment slug unblocking agent is made up of the component of following weight percentage: JHB-1 type High-efficiency oil displacement agent 2%, ammonium chloride 1%, and surplus is water; The broken glue slug unblocking agent of oxidation is made up of the component of following weight percentage: SPC-D 10%, promoting agent 1%, the anti-oxidation inhibiter 0.5% of JHS-1 shaped steel iron, ethanol 2%, and surplus is water; Rearmounted synergy slug unblocking agent is made up of the component of following weight percentage: Textone 5%, citric acid 10%, fluoroboric acid 5%, ammonium bifluoride 2%, ammonium chloride 1%, JHB-1 type High-efficiency oil displacement agent 2%, the anti-oxidation inhibiter 0.5% of JHS-1 shaped steel iron, ethanol 2%, surplus is water.
In the present embodiment, the poly-preparation method who stops up well slug combination unblocking agent of note is with embodiment 1.
Embodiment 3
The poly-well slug combination unblocking agent that stops up of note in the present embodiment comprises pre-treatment slug unblocking agent, the broken glue slug unblocking agent of oxidation and rearmounted synergy slug unblocking agent.Wherein, pre-treatment slug unblocking agent is made up of the component of following weight percentage: JHB-1 type High-efficiency oil displacement agent 3.5%, ammonium chloride 1.5%, and surplus is water; The broken glue slug unblocking agent of oxidation is made up of the component of following weight percentage: SPC-D 15%, promoting agent 1.5%, the anti-oxidation inhibiter 1.2% of JHS-1 shaped steel iron, ethanol 3.5%, and surplus is water; Rearmounted synergy slug unblocking agent is made up of the component of following weight percentage: Textone 7.5%, citric acid 15%, fluoroboric acid 5.5%, ammonium bifluoride 2.5%, ammonium chloride 1.5%, JHB-1 type High-efficiency oil displacement agent 2.5%, the anti-oxidation inhibiter 1.2% of JHS-1 shaped steel iron, ethanol 3.5%, surplus is water.
In the present embodiment, the poly-preparation method who stops up well slug combination unblocking agent of note is with embodiment 1.
Embodiment 4
The poly-well slug combination unblocking agent that stops up of note in the present embodiment comprises pre-treatment slug unblocking agent, the broken glue slug unblocking agent of oxidation and rearmounted synergy slug unblocking agent.Wherein, pre-treatment slug unblocking agent is made up of the component of following weight percentage: JHB-1 type High-efficiency oil displacement agent 4%, ammonium chloride 1.5%, and surplus is water; The broken glue slug unblocking agent of oxidation is made up of the component of following weight percentage: SPC-D 13%, promoting agent 2%, the anti-oxidation inhibiter 1.5% of JHS-1 shaped steel iron, ethanol 3%, and surplus is water; Rearmounted synergy slug unblocking agent is made up of the component of following weight percentage: Textone 8%, citric acid 15%, fluoroboric acid 5%, ammonium bifluoride 2%, ammonium chloride 2%, JHB-1 type High-efficiency oil displacement agent 3%, the anti-oxidation inhibiter 0.5% of JHS-1 shaped steel iron, ethanol 2%, surplus is water.
In the present embodiment, the poly-preparation method who stops up well slug combination unblocking agent of note is with embodiment 1.
Test example 1
Pre-treatment slug washing oil rate test method: in the oil-sand of 50 grams of oil-containings 30%, add respectively the pre-treatment slug unblocking agent 100ml of embodiment 1～4 preparation, stir after 10 minutes and leave standstill, isolate free crude oil and weigh, the free crude oil weight/oil-sand Crude Oil heavy × 100% of washing oil rate %=.Test-results refers to following table 1.
The broken glue rate test method of oxidation: get aldehyde cross-linked polymer gel, chrominum cross-linkage polymer gel and the each 50g of polyacrylamide mother liquor that oilfield polymer flooding is conventional, be respectively charged in the plunger graduated cylinder of 100ml, add respectively the broken each 50ml of glue slug unblocking agent of oxidation of embodiment 1～4 preparation, after sealing, insert in 70 DEG C of baking ovens isothermal reaction 24 hours, after said sample complete reaction, the residue reacting in forward and backward solution by filtering separation and dry constant weight calculates the broken glue rate of oxidation, and test-results refers to following table 1.
The killing rate test method of sulphate reducing bacteria: adopt oilfield injection well sewage to cultivate SBR bacterial classification, get 4 parts of 10ml nutrient solutions detecting the contet of sulphate reducing bacteria number, add respectively the each 50ml of rearmounted synergy slug unblocking agent of embodiment 1～4 preparation to carry out sterile test, detect after sterilizing in solution sulphate reducing bacteria number and calculate sulphate reducing bacteria killing rate.Test-results is as table 1.
Silt particle corrosion rate test method: scene takes injection well reverse flow stuff some, adopt the pre-treatment slug in embodiment 1 to clean absolute oil dirt and be oxidized broken glue slug oxygenolysis to fall after the organism such as polymkeric substance, by isolated silt particle drying constant weight, get 20 grams of the silt particles of drying constant weight and be placed in tool plug graduated cylinder, then add respectively the each 50ml of rearmounted synergy slug unblocking agent of embodiment 1～4 preparation, after sealing, insert in 70 DEG C of baking ovens isothermal reaction 24 hours, residue in filtering separation and dry constant weight solution, the corrosion rate of calculating silt particle, test-results refers to following table 1.
The poly-performance of stopping up well slug combination unblocking agent of table 1 embodiment 1～4 preparation note
Test example 2
Certain injection well, the poly-layer of note position is IV 5
3, 9,10
1layer, thick 13.8 meters of sand, injection of polymer concentration 2000mg/l, day injection allocation amount 130m
3/ d, real fluence 130m under oil pressure 10Mpa
3/ d.Next year the autumn adopts aldehyde cross-linked polymer gel to carry out full well profile control, and 70 meters of radius of profile controls are pressed IV 5 after profile control
3/ IV 9,10
1layer water injection through tubing and casing, injection allocation is respectively 40/80m
3/ d, under casing pressure 14MPa/ oil pressure 15MPa, real fluence is respectively 40/50m
3/ d, IV 5
3inject normally IV 9,10
1layer is shorted, to the Second Year spring, and IV 9,10
1layer injection rate under oil pressure 20.0MPa is 0, and reservoir choke is serious, and this layer is forced to close down note.
Think, this well IV 9,10
1the layer injection of polymer time is longer, adopts aldehyde cross-linked polymer gel to carry out deep profile controlling midway, joins poly-sewage sulphate reducing bacteria and inorganic impurity content not up to standard for a long time, this well IV 9,10 simultaneously
1layer stop up jointly be caused by greasy dirt, polymkeric substance and inorganic impurity, and stop up radius darker, for this reason, adopt slug combination of the present invention step by step removing clog in deep reservoir technological method carry out removing clog in deep reservoir measure, preparation process is as follows:
Preparation pre-treatment slug unblocking agent 80 sides (20 × 4 tank): measure 19.5m
3water is poured 25m into
3in Agitation Tank with electric stirring, under agitation condition, add successively JHB-1 High-efficiency oil displacement agent 700kg, ammonium chloride 300kg, continue stirred for several minute and be extremely dissolved into homogeneous transparent solution for standby completely.Repeat above-mentioned dosing process, accumulative total is prepared pre-treatment slug unblocking agent 80m
3.
Broken glue slug unblocking agent 300 sides (50 × 6 tank) of preparation oxidation: measure 39.5m
3water is poured 60m into
3in Agitation Tank with electric stirring, under agitation condition, add successively SPC-D 7.5t, promoting agent 0.5t, the anti-oxidation inhibiter 0.625t of JHS-1 shaped steel iron, ethanol 1.75t, after adding, continue to be stirred to dissolving perfect solution and become homogeneous transparent shape and get final product.Repeat above-mentioned dosing process, the broken glue slug unblocking agent 300m of accumulative total preparation oxidation
3.
Prepare rearmounted synergy slug unblocking agent 300 sides (50 × 6 tank): measure 39.5m
3water is poured 60m into
3in Agitation Tank with electric stirring, under agitation condition, add successively Textone 3.75t, citric acid 7.5t, fluoroboric acid 2.75t, ammonium bifluoride 1.25t, ammonium chloride 0.75t, JHB-1 type High-efficiency oil displacement agent 1.25t, the anti-oxidation inhibiter 0.625t of JHS-1 shaped steel iron, ethanol 1.75t, after adding, continue to be stirred to dissolving perfect solution and become homogeneous transparent shape and get final product.Repeat above-mentioned dosing process, accumulative total is prepared rearmounted synergy slug unblocking agent 300m
3.
Adopt deep injection technology step by step to clamp-on successively IV 9,10 by above-mentioned to each slug
1layer has carried out chemical plugging removal, first by 80m
3pre-treatment slug unblocking agent is clamp-oned zone of interest, closing well reaction 4 hours, remove the greasy dirt on tamper surface, the tamper such as polymkeric substance and cross-linked polymer gel and various inorganic impurity in tamper come out, so as with the abundant contact reacts of oxidation gel breaker of follow-up slug; Then by 300m
3the broken glue slug unblocking agent of oxidation is clamp-oned zone of interest, and closing well reaction 24 hours, removes the organic obstruction composition such as polymkeric substance and cross-linked polymer gel in tamper; Finally by 300m
3rearmounted synergy slug unblocking agent is clamp-oned zone of interest, closing well reaction 30 hours, the inorganic tampers such as one side stabilized and corrosion Iron sulfuret and silt particle, simultaneously, the pre-treatment slug having injected above and the broken glue slug of oxidation are further advanced to earth formation deep, utilize remaining effective constituent in the broken glue slug of pre-treatment slug and oxidation, continue to clean organic tamper of the earth formation deep such as greasy dirt and oxygenolysis polymkeric substance and cross-linked polymer gel that stops up earth formation deep, expand plug removal radius, realize removing clog in deep reservoir object step by step.
This well IV 9,10
1layer employing slug combination of the present invention step by step removing clog in deep reservoir technological method carries out after removing clog in deep reservoir measure, recovers normal note consor and produces, the front IV 9,10 of measure
1layer under oil pressure 20.0MPa daily water-injection rate be 0, after measure at oil pressure 12.8MP
aunder, day polymer waterflooding 80m
3/ d, reaches injection allocation requirement, nearly 15 months of validity period, and accumulative total augmented injection amount of polymers reaches 35830m
3, obtained significant unblocking and injection increasing effect.
Claims (10)
1. the poly-well slug combination unblocking agent that stops up of note, it is characterized in that: comprise the broken glue slug unblocking agent of oxidation, the broken glue slug unblocking agent of described oxidation is made up of the component of following weight percentage: SPC-D 10～20%, promoting agent 1～2%, inhibiter 0.5～2%, mutual solvent 2～5%, surplus is water.
2. the poly-well slug combination unblocking agent that stops up of note, it is characterized in that: comprise pre-treatment slug unblocking agent, described pre-treatment slug unblocking agent is made up of the component of following weight percentage: JHB-1 type High-efficiency oil displacement agent 2～5%, ammonium chloride 1～2%, surplus is water.
3. the poly-well slug combination unblocking agent that stops up of note, it is characterized in that: comprise rearmounted synergy slug unblocking agent, described rearmounted synergy slug unblocking agent is made up of the component of following weight percentage: Textone 5～10%, citric acid 10～20%, fluoroboric acid 5～6%, ammonium bifluoride 2～3%, ammonium chloride 1～2%, JHB-1 type High-efficiency oil displacement agent 2～3%, inhibiter 0.5～2%, mutual solvent 2～5%, surplus is water.
4. the poly-well slug combination unblocking agent that stops up of note, it is characterized in that: comprise pre-treatment slug unblocking agent, the broken glue slug unblocking agent of oxidation and rearmounted synergy slug unblocking agent, described pre-treatment slug unblocking agent is made up of the component of following weight percentage: JHB-1 type High-efficiency oil displacement agent 2～5%, ammonium chloride 1～2%, surplus is water, the broken glue slug unblocking agent of described oxidation is made up of the component of following weight percentage: SPC-D 10～20%, promoting agent 1～2%, inhibiter 0.5～2%, mutual solvent 2～5%, surplus is water, described rearmounted synergy slug unblocking agent is made up of the component of following weight percentage: Textone 5～10%, citric acid 10～20%, fluoroboric acid 5～6%, ammonium bifluoride 2～3%, ammonium chloride 1～2%, JHB-1 type High-efficiency oil displacement agent 2～3%, inhibiter 0.5～2%, mutual solvent 2～5%, surplus is water.
5. the poly-well slug combination unblocking agent that stops up of note according to claim 4, is characterized in that: described inhibiter is the anti-oxidation inhibiter of JHS-1 shaped steel iron.
6. the poly-well slug combination unblocking agent that stops up of note according to claim 4, is characterized in that: described mutual solvent is ethanol.
7. the poly-preparation method who stops up well slug combination unblocking agent of note as claimed in claim 1, it is characterized in that: the preparation method of the described broken glue slug unblocking agent of oxidation is: accurately get each component according to weight percentage, in water, stir and add SPC-D, promoting agent to dissolving completely, then stirring adds mutual solvent, inhibiter to dissolving completely and get final product successively.
8. the poly-preparation method who stops up well slug combination unblocking agent of note as claimed in claim 2, it is characterized in that: the preparation method of described pre-treatment slug unblocking agent is: accurately get each component according to weight percentage, in water, stir and add JHB-1 type High-efficiency oil displacement agent, ammonium chloride successively, continue to be stirred to and dissolve completely and get final product.
9. the poly-preparation method who stops up well slug combination unblocking agent of note as claimed in claim 3, it is characterized in that: the preparation method of described rearmounted synergy slug unblocking agent is: accurately get each component according to weight percentage, in water, stir and add Textone to dissolving completely, stir and add citric acid, fluoroboric acid, ammonium bifluoride, ammonium chloride, JHB-1 type High-efficiency oil displacement agent, inhibiter and mutual solvent successively again, continue to be stirred to and dissolve completely and get final product.
10. the application of the poly-obstruction of note as claimed in claim 4 well slug combination unblocking agent in de-plugging polymer in injection wells stratum, is characterized in that: comprise the following steps: first pre-treatment slug unblocking agent is clamp-oned to de-plugging zone of interest, closing well reaction 3～5 hours; Again broken oxidation glue slug unblocking agent is clamp-oned to zone of interest, closing well reaction 20～28 hours; Finally rearmounted synergy slug unblocking agent is clamp-oned to zone of interest, water filling is amplified in closing well reaction after 26～34 hours can proceed to normal note consor product for 5～7 days.
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