CN103881674B - A kind of note poly-blocking well slug combination unblocking agent, preparation method and application - Google Patents
A kind of note poly-blocking well slug combination unblocking agent, preparation method and application Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 164
- 238000002347 injection Methods 0.000 claims abstract description 53
- 239000007924 injection Substances 0.000 claims abstract description 53
- 239000003292 glue Substances 0.000 claims abstract description 52
- 230000003647 oxidation Effects 0.000 claims abstract description 50
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229920000642 polymer Polymers 0.000 claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 239000002904 solvent Substances 0.000 claims abstract description 14
- 230000001737 promoting effect Effects 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 48
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 44
- 238000002203 pretreatment Methods 0.000 claims description 36
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 33
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 28
- 238000006073 displacement reaction Methods 0.000 claims description 25
- 229910052742 iron Inorganic materials 0.000 claims description 24
- 235000019270 ammonium chloride Nutrition 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 19
- 230000003064 anti-oxidating effect Effects 0.000 claims description 15
- 230000000903 blocking effect Effects 0.000 claims description 13
- RILZRCJGXSFXNE-UHFFFAOYSA-N 2-[4-(trifluoromethoxy)phenyl]ethanol Chemical compound OCCC1=CC=C(OC(F)(F)F)C=C1 RILZRCJGXSFXNE-UHFFFAOYSA-N 0.000 claims description 12
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 claims description 11
- 239000012467 final product Substances 0.000 claims description 11
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 3
- 239000000047 product Substances 0.000 claims description 3
- 229920006037 cross link polymer Polymers 0.000 abstract description 14
- 230000001965 increasing effect Effects 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 3
- 229920002401 polyacrylamide Polymers 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 239000007864 aqueous solution Substances 0.000 abstract description 2
- 230000003628 erosive effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 32
- 239000000499 gel Substances 0.000 description 23
- 239000000126 substance Substances 0.000 description 21
- 238000000034 method Methods 0.000 description 15
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 14
- 239000000243 solution Substances 0.000 description 14
- 241000894006 Bacteria Species 0.000 description 13
- 229910021653 sulphate ion Inorganic materials 0.000 description 13
- 230000015572 biosynthetic process Effects 0.000 description 11
- 239000002245 particle Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 8
- 238000013019 agitation Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 239000010779 crude oil Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 3
- 230000002147 killing effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003027 oil sand Substances 0.000 description 2
- 150000003016 phosphoric acids Chemical class 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000004155 Chlorine dioxide Substances 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000003190 augmentative effect Effects 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- UUVBYOGFRMMMQL-UHFFFAOYSA-N calcium;phosphoric acid Chemical compound [Ca].OP(O)(O)=O UUVBYOGFRMMMQL-UHFFFAOYSA-N 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 235000019398 chlorine dioxide Nutrition 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000003090 exacerbative effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 or limiting, e.g. 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
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- Materials Engineering (AREA)
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- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
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Abstract
The present invention discloses a kind of note poly-blocking well slug combination unblocking agent, preparation method and application, belongs to technical field of tertiary oil recovery. This unblocking agent comprises the broken glue slug unblocking agent of 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%, and surplus is water. The feature that the broken glue slug unblocking agent of the oxidation of injection well slug combination unblocking agent of the present invention has the broken glue rate height of oxidation, corrodibility is low and security is good. The broken glue rate of the oxygenolysis of its polyacrylamide commonly used by oilfield polymer flooding and cross-linked polymer gel system thereof, all more than 96%, adopts the erosion rate of N80 steel disc standard specimen detection at 1g/m2Below h. Polymer in injection wells thing is after it decomposes and breaks glue, and originally sticky thick glue shape black tamper turns into transparent aqueous solution, and good fluidity and residue rate are low, can efficiently release injection well reservoir choke, it is achieved unblocking and injection increasing object.
Description
Technical field
The present invention is specifically related to a kind of note poly-blocking well slug combination unblocking agent, and the preparation method of this combination unblocking agent and application, belongs to technical field of tertiary oil recovery.
Background technology
Polymer displacement of reservoir oil tech is the crude oil for inhibiting production rate decline of water flooding later stage and the dominant technology measure improving recovery ratio further. But, in polymer flooding process, owing to the effects such as the absorption of polymkeric substance in the porous medium of stratum, delay and machinery trapping very easily cause injection well reservoir choke. In order to suppress polymkeric substance channelling in polymer flooding process, expand the swept volume of polymkeric substance, usually before polymer flooding, in polymer flooding and the different steps such as postpolymer flood adopt polymer gel to carry out profile control, exacerbate the reservoir choke of injection well further, 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 pressure is higher, cause injection well can not injection rate injection of polymer solution on request, block serious injection well note and do not enter polymkeric substance and can only stop note by closing well, seriously affect polymer flooding effect and field produces.
By note poly-blocking well site work reverse flow stuff sampling analysis is found, injection well reservoir choke thing is black visco-elasticity jelly, form primarily of water, greasy dirt, polymkeric substance and cross linked gel, silt particle and other inorganic impurity etc., these materials are bundled together alternately, in rubber shape after dehydration is dry, if not adopting chemical process, each component is difficult to effectively separately. Also containing a large amount of sulphate reducing bacterias from the liquid that tamper is isolated, the sulfate ion in solution can be reduced to hydrogen sulfide by them, and then erode downhole iron and steel tubing string produces Iron sulfuret precipitation blocking 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 to be released greasy dirt and blocking that the organism such as polymkeric substance and cross linked gel thereof causes, need effectively to release 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 blocking.
In addition, take effect injection well 3��4 years even longer time of usual injection of polymer solution flatly, in very long injection process, the absorption of polymkeric substance in the porous medium of stratum, delay and the inevitable deep that be deep into stratum by immediate vicinity of wellbore gradually of machinery trapping, earth formation deep is caused to block, simultaneously, the whole process profile control measures extensively adopted to suppress polymkeric substance channelling in polymer flooding process, exacerbating earth formation deep blocking further, this plug removal radius just requiring to note poly-blocking well must reach certain degree of depth.
At present, generally there is following technical problem in the note of domestic employing poly-blocking well block releasing technique: one is the complicacy ignoring polymer in injection wells thing, only focus on the development and application of polymkeric substance and cross linked gel tamper de-plugging chemical agent thereof, ignore greasy dirt and various inorganic tamper is also the major reason causing reservoir choke, or do not consider the physicochemical property difference of various tamper, various unblocking agent is generally injected de-plugging, chemical agent is difficult to effective contact reacts with corresponding tamper, plugging removal effect usually and shop experiment effect differ greatly; Two is rigidly adhere in the inertial thinking of nearly well de-plugging, and plug removal radius designs usually at 2��3 meters, ignores the characteristic of note poly-blocking well depth portion blocking, does not reach the object of deep de-plugging.
Summary of the invention
It is an object of the invention to provide a kind of note poly-blocking well slug combination unblocking agent.
Meanwhile, the present invention also provides a kind of preparation method noting poly-blocking well slug combination unblocking agent.
Finally, the present invention also provides a kind of and notes the application of poly-blocking well slug combination unblocking agent in de-plugging polymer in injection wells stratum.
In order to realize above object, the technical solution adopted in the present invention is:
A kind of note poly-blocking well slug combination unblocking agent, 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 and causes the main tamper such as the polymkeric substance of polymer in injection wells and cross-linked polymer gel, is key and the core slug of note poly-blocking well de-plugging.
Described activator forms primarily 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. The JHS-1 anti-oxidation inhibiter of shaped steel iron can be adopted, provide by petrochemical complex institute of China University Of Petroleum Beijing.
Described mutual solvent is ethanol.
A kind of note poly-blocking well slug combination unblocking agent, 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%, and 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 with the abundant contact reacts of oxidation gel breaker of follow-up slug, improve the broken glue of oxidation and plugging removal effect, simultaneously, pre-treatment slug can also release local water lock and reduce hollow billet tension force, 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
A kind of note poly-blocking well slug combination unblocking agent, 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 under formation conditions and generate dioxide peroxide and hydrogen fluoride, can effectively kill sulphate reducing bacteria and the various inorganic tamper of corrosion.
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 respectively with this area conventional slug unblocking agent with the use of, can also select arbitrarily from above-mentioned three simultaneously two or three with the use of. 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 development situation.
Preferably, a kind of note poly-blocking well slug combination unblocking agent, 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 preparation method for poly-blocking well slug combination unblocking agent, comprise the following steps:
The preparation method of the broken glue slug unblocking agent of described oxidation is: accurately get each component according to weight percentage, stirs and adds SPC-D, promoting agent to dissolving completely, then stirring adds mutual solvent successively, inhibiter is to dissolving completely and get final product in water.
The preparation method of described pre-treatment slug unblocking agent is: accurately get each component according to weight percentage, stirs successively and adds JHB-1 type High-efficiency oil displacement agent, ammonium chloride, continue to be stirred to and dissolve completely and get final product in water.
The preparation method of described rearmounted synergy slug unblocking agent is: accurately get each component according to weight percentage, water stirs and adds Textone to dissolving completely, stir successively again and add citric acid, fluoroboric acid, ammonium bifluoride, ammonium chloride, JHB-1 type High-efficiency oil displacement agent, inhibiter and mutual solvent, continue to be stirred to and dissolve completely and get final product.
Note the application of poly-blocking well slug combination unblocking agent in de-plugging polymer in injection wells stratum, comprise the following steps: first pre-treatment slug unblocking agent is squeezed into de-plugging zone of interest, closing well reaction 3��5 hours; Again broken for oxidation glue slug unblocking agent is squeezed into zone of interest, closing well reaction 20��28 hours; Finally squeezing into zone of interest by rearmounted synergy slug unblocking agent, water filling is amplified in closing well reaction after 26��34 hours can proceed to normal note consor product for 2��4 days.
The useful effect of the present invention:
The feature that the broken glue slug unblocking agent of the oxidation of injection well slug combination unblocking agent of the present invention has the broken glue rate height of oxidation, corrodibility is low and security is good. The broken glue rate of the oxygenolysis of its polyacrylamide commonly used by oilfield polymer flooding and cross-linked polymer gel system thereof, all more than 96%, adopts the erosion rate of N80 steel disc standard specimen detection at 1g/m2Below h. Polymer in injection wells thing is after its oxidation gel breaker decomposes and breaks glue, and originally sticky thick glue shape black tamper turns into transparent aqueous solution, and good fluidity and residue rate are low, can efficiently release injection well reservoir choke, it is achieved 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, after the black visco-elasticity tamper taked from note poly-blocking well soaks through it and cleans, the greasy dirt on tamper surface is removed efficiently, the tampers such as polymkeric substance in tamper and cross-linked polymer gel and inorganic impurity are exposed so that it is with the oxidation broken glue more fully contact reacts of the broken glue slug of oxidation, it is to increase de-plugging efficiency. In addition, pre-treatment slug also has the function releasing greasy dirt blocking and reducing follow-up slug injection pressure.
The rearmounted synergy slug unblocking agent of injection well slug combination unblocking agent of the present invention has the effect killed and 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 chlorine dioxide bactericide that can efficiently kill sulphate reducing bacteria and oxygenolysis Iron sulfuret tamper under formation conditions, 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 hydrochloric acid mixed solution that silt particle has efficient corrosion effect under formation conditions, 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 simply, easily operate, is suitable for suitability for industrialized production and rig-site utilization.
The present invention notes poly-blocking well slug combination unblocking agent and combines by pre-treatment slug unblocking agent, the broken glue slug unblocking agent of oxidation, rearmounted synergy slug unblocking agent, each slug acts synergistically, can efficiently release and mutually wrap up visco-elasticity glue shape tamper by greasy dirt, polymkeric substance, cross-linked polymer gel and various inorganic impurity, it is achieved blocking injection well unblocking and injection increasing object.
The present invention notes the application of poly-blocking well slug combination unblocking agent in de-plugging polymer in injection wells stratum, 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 on-the-spot de-plugging is constructed, first inject the greasy dirt that pre-treatment slug unblocking agent removes tamper surface and immediate vicinity of wellbore, the tamper such as polymkeric substance and cross-linked polymer gel is come out, so that with the abundant contact reacts of oxidation gel breaker of follow-up slug, simultaneously, release local water lock and reduce hollow billet tension force, reduce follow-up injection pressure; Then injecting the broken glue slug unblocking agent of oxidation, the tampers such as the oxidation gel breaker of this slug and the above-mentioned polymkeric substance that comes out and cross-linked polymer gel carry out being oxidized brokenly glue and react and decomposed by its exhaustive oxidation, release the blocking that its formation causes; Finally inject rearmounted synergy slug, the dosage of this slug glue slug broken with oxidation is identical, continue to advance to earth formation deep by broken for oxidation glue blocking on the one hand, make full use of pre-treatment slug and the remaining composition of the broken glue slug of oxidation, expand plug removal radius, it is achieved deep de-plugging object step by step, simultaneously, rearmounted synergy slug unblocking agent also has kills sulphate reducing bacteria, oxygenolysis Iron sulfuret and the inorganic tamper such as corrosion silt particle and stratum matrix, releases inorganic tamper, improves plugging removal effect further.
Embodiment
The present invention is only described in further detail by following embodiment, but does not form any limitation of the invention.
Embodiment 1
Note in the present embodiment poly-blocking well slug combination unblocking agent 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: the anti-oxidation inhibiter 2% of SPC-D 20%, promoting agent 2%, 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 preparation method of note poly-blocking well slug combination unblocking agent in the present embodiment, comprises the following steps:
The preparation method of the broken glue slug unblocking agent of described oxidation is: accurately get each component according to weight percentage, water stirs and adds SPC-D, promoting agent to dissolving completely, then stir successively add the JHS-1 anti-oxidation inhibiter of shaped steel iron, ethanol to solution is homogeneous transparent shape and get final product;
The preparation method of described pre-treatment slug unblocking agent is: accurately get each component according to weight percentage, stirs successively and add JHB-1 type High-efficiency oil displacement agent, ammonium chloride in water, continues to be stirred to solution and is 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, water stirs and adds Textone to dissolving completely, stir successively again 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, continue to be stirred to solution and be homogeneous transparent shape and get final product.
In the present embodiment, note is poly-blocks the application of well slug combination unblocking agent in de-plugging polymer in injection wells stratum, comprises the following steps: first squeezing into de-plugging zone of interest by pre-treatment slug unblocking agent, closing well reacts 4 hours; Squeezing into zone of interest by broken for oxidation glue slug unblocking agent again, closing well reacts 24 hours; Finally squeezing into zone of interest by rearmounted synergy slug unblocking agent, closing well amplifies water filling after reacting 30 hours can proceed to normal note consor product for 6 days.
Embodiment 2
Note in the present embodiment poly-blocking well slug combination unblocking agent 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: the anti-oxidation inhibiter 0.5% of SPC-D 10%, promoting agent 1%, 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 preparation method of note poly-blocking well slug combination unblocking agent is with embodiment 1.
Embodiment 3
Note in the present embodiment poly-blocking well slug combination unblocking agent 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: the anti-oxidation inhibiter 1.2% of SPC-D 15%, promoting agent 1.5%, 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 preparation method of note poly-blocking well slug combination unblocking agent is with embodiment 1.
Embodiment 4
Note in the present embodiment poly-blocking well slug combination unblocking agent 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: the anti-oxidation inhibiter 1.5% of SPC-D 13%, promoting agent 2%, 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 preparation method of note poly-blocking well slug combination unblocking agent 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 pre-treatment slug unblocking agent 100ml prepared by embodiment 1��4 respectively, stir and leave standstill after 10 minutes, isolate free crude oil and weigh, the free crude oil weight/crude oil from oil sand heavy �� 100% of washing oil rate %=. Test-results refers to following table 1.
The broken glue rate test method of oxidation: get the conventional aldehyde cross-linked polymer gel of oilfield polymer flooding, chrominum cross-linkage polymer gel and each 50g of polyacrylamide mother liquor, it is respectively charged in the plunger graduated cylinder of 100ml, add the broken glue each 50ml of slug unblocking agent of oxidation prepared by embodiment 1��4 respectively, isothermal reaction 24 hours in 70 DEG C of baking ovens are inserted after sealing, after said sample complete reaction, reacting the residue in forward and backward solution by filtering separation and dry constant weight and calculate the broken glue rate of oxidation, 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 and detecting the contet of sulphate reducing bacteria number, add the rearmounted synergy each 50ml of slug unblocking agent prepared by embodiment 1��4 respectively and carry out sterile test, after detection sterilizing in solution sulphate reducing bacteria number and calculate sulphate reducing bacteria killing rate. Test-results is such as table 1.
Silt particle corrosion rate test method: scene takes injection well reverse flow stuff some, after adopting the cleaning absolute oil dirt of the pre-treatment slug in embodiment 1 and the broken glue slug oxygenolysis of oxidation to fall the organism such as polymkeric substance, the silt particle drying constant weight that will isolate, get the silt particle 20 grams drying constant weight and it is placed in tool plug graduated cylinder, then add the rearmounted synergy each 50ml of slug unblocking agent prepared by embodiment 1��4 respectively, isothermal reaction 24 hours in 70 DEG C of baking ovens are inserted after sealing, filtering separation and the residue in dry constant weight solution, calculate the corrosion rate of silt particle, test-results refers to following table 1.
Table 1 embodiment 1��4 prepares the performance of note poly-blocking well slug combination unblocking agent
Test example 2
Certain injection well, note poly layer position is IV 53��9��101Layer, thick 13.8 meters of sand, injection of polymer concentration 2000mg/l, day injection allocation amount 130m3/ d, real fluence 130m under oil pressure 10Mpa3/ d. Aldehyde cross-linked polymer gel is adopted to carry out full well profile control, radius of profile control 70 meters every the autumn in year, by IV 5 after profile control3/��9��101Layer water injection through tubing and casing, injection allocation is respectively 40/80m3/ d, under casing pressure 14MPa/ oil pressure 15MPa, real fluence is respectively 40/50m3/ d, IV 53Inject normal, IV 9,101Layer is shorted, to the 2nd year spring, and IV 9,101Layer 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 9,101The layer injection of polymer time is longer, and midway adopts aldehyde cross-linked polymer gel to carry out deep profile controlling, joins poly-sewage sulphate reducing bacteria and inorganic impurity content long-term not up to standard, this well IV 9,10 simultaneously1Layer blocking should be caused jointly by greasy dirt, polymkeric substance and inorganic impurity, and blocking radius is relatively dark, for this reason, adopt slug combination of the present invention step by step deep block releasing technique method carry out deep breaking block treatment, preparation process is as follows:
Preparation pre-treatment slug unblocking agent 80 side (20 �� 4 tank): measure 19.5m3Water pours 25m into3In Agitation Tank with electronic stirring, add JHB-1 High-efficiency oil displacement agent 700kg, ammonium chloride 300kg under agitation successively, continue stirred for several minute to being dissolved into homogeneous transparent solution for standby completely. Repeat above-mentioned dosing process, accumulative preparation pre-treatment slug unblocking agent 80m3��
Broken glue slug unblocking agent 300 side (50 �� 6 tank) of preparation oxidation: measure 39.5m3Water pours 60m into3In Agitation Tank with electronic stirring, add SPC-D 7.5t, the anti-oxidation inhibiter 0.625t of promoting agent 0.5t, JHS-1 shaped steel iron, ethanol 1.75t under agitation successively, continue after adding to be stirred to and dissolve complete solution uniformly transparent shape and get final product. Repeat above-mentioned dosing process, the accumulative broken glue slug unblocking agent 300m of preparation oxidation3��
Prepare rearmounted synergy slug unblocking agent 300 side (50 �� 6 tank): measure 39.5m3Water pours 60m into3In Agitation Tank with electronic stirring, add 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 anti-oxidation inhibiter 0.625t of 1.25t, JHS-1 shaped steel iron, ethanol 1.75t under agitation successively, continue after adding to be stirred to and dissolve complete solution uniformly transparent shape and get final product. Repeat above-mentioned dosing process, the rearmounted synergy slug unblocking agent 300m of accumulative preparation3��
Deep injection technology step by step is adopted to squeeze above-mentioned successively into IV 9,10 to each slug1Layer has carried out chemical plugging removal, namely first by 80m3Pre-treatment slug unblocking agent squeezes into zone of interest, closing well reacts 4 hours, remove the greasy dirt on tamper surface, the tampers such as the polymkeric substance in tamper and cross-linked polymer gel and various inorganic impurity come out, so as with the abundant contact reacts of oxidation gel breaker of follow-up slug; Then by 300m3The broken glue slug unblocking agent of oxidation squeezes into zone of interest, and closing well reacts 24 hours, releases the organic plugging compositions such as the polymkeric substance in tamper and cross-linked polymer gel; Finally by 300m3Rearmounted synergy slug unblocking agent squeezes into zone of interest, closing well reacts 30 hours, kill sulphate reducing bacteria and the inorganic tamper such as corrosion Iron sulfuret and silt particle on the one hand, simultaneously, broken to the pre-treatment slug injected above and oxidation glue slug is advanced to earth formation deep further, utilize effective constituent remaining in pre-treatment slug and the broken glue slug of oxidation, continue the organic plugging thing of greasy dirt and the earth formation deep such as oxygenolysis polymkeric substance and cross-linked polymer gel cleaning blocking earth formation deep, expand plug removal radius, it is achieved deep de-plugging object step by step.
This well IV 9,101Layer adopts slug combination of the present invention after block releasing technique method in deep carries out deep breaking block treatment step by step, recovers normal note consor and produces, before measure IV 9,101Layer daily water-injection rate under oil pressure 20.0MPa is 0, at oil pressure 12.8MP after measureaUnder, day polymer waterflooding 80m3/ d, reaches injection allocation requirement, nearly 15 months of validity period, and accumulative augmented injection amount of polymers reaches 35830m3, achieve significant unblocking and injection increasing effect.
Claims (7)
1. a note poly-blocking well slug combination unblocking agent, 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.
2. note according to claim 1 poly-blocking well slug combination unblocking agent, it is characterised in that: described inhibiter is the JHS-1 anti-oxidation inhibiter of shaped steel iron.
3. note according to claim 1 poly-blocking well slug combination unblocking agent, it is characterised in that: described mutual solvent is ethanol.
4. the preparation method of a note poly-blocking well slug combination unblocking agent as according to any one of claims 1 to 3, it is characterized in that: the preparation method of the broken glue slug unblocking agent of described oxidation is: accurately get each component according to weight percentage, water stirs and adds SPC-D, promoting agent to dissolving completely, then stirring adds mutual solvent successively, inhibiter is to dissolving completely and get final product.
5. preparation method according to claim 4, it is characterized in that: the preparation method of described pre-treatment slug unblocking agent is: accurately get each component according to weight percentage, water stirs successively and adds JHB-1 type High-efficiency oil displacement agent, ammonium chloride, continue to be stirred to and dissolve completely and get final product.
6. preparation method according to claim 4, it is characterized in that: the preparation method of described rearmounted synergy slug unblocking agent is: accurately get each component according to weight percentage, water stirs and adds Textone to dissolving completely, stir successively again and add citric acid, fluoroboric acid, ammonium bifluoride, ammonium chloride, JHB-1 type High-efficiency oil displacement agent, inhibiter and mutual solvent, continue to be stirred to and dissolve completely and get final product.
7. noting as according to any one of claims 1 to 3 gathers the application of blocking well slug combination unblocking agent in de-plugging polymer in injection wells stratum, it is characterized in that: comprise the following steps: first pre-treatment slug unblocking agent is squeezed into de-plugging zone of interest, closing well reaction 3��5 hours; Again broken for oxidation glue slug unblocking agent is squeezed into zone of interest, closing well reaction 20��28 hours; Finally squeezing into zone of interest by rearmounted synergy slug unblocking agent, 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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