CN105670586A - Flushing fluid for low-water-content oil wells - Google Patents

Flushing fluid for low-water-content oil wells Download PDF

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Publication number
CN105670586A
CN105670586A CN201610121659.1A CN201610121659A CN105670586A CN 105670586 A CN105670586 A CN 105670586A CN 201610121659 A CN201610121659 A CN 201610121659A CN 105670586 A CN105670586 A CN 105670586A
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China
Prior art keywords
flushing fluid
oil
nano silicon
low
biofuel
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Granted
Application number
CN201610121659.1A
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Chinese (zh)
Other versions
CN105670586B (en
Inventor
蒋平
张磊
葛际江
张贵才
裴海华
王洋
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China University of Petroleum East China
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China University of Petroleum East China
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Priority to CN201610121659.1A priority Critical patent/CN105670586B/en
Publication of CN105670586A publication Critical patent/CN105670586A/en
Application granted granted Critical
Publication of CN105670586B publication Critical patent/CN105670586B/en
Expired - Fee Related legal-status Critical Current
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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
    • 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
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/502—Oil-based compositions
    • 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
    • C09K2208/10—Nanoparticle-containing well treatment fluids

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Lubricants (AREA)
  • Silicon Compounds (AREA)

Abstract

The invention provides a flushing fluid for low-water-content oil wells. The flushing fluid is prepared from nano silicon dioxide and biodiesel, wherein the nano silicon dioxide accounts for 1-5% of the total weight. The flushing fluid has the advantages of favorable shear-thinning property and higher filtrate loss reduction capacity, and can be used for sufficiently flushing oil casing and keeping the oil permeability in the reservoir. The filtrate loss reduction rate of the flushing fluid system is greater than 90%, the oil permeability recovery ratio is greater than 98%, and thus, the flushing fluid is a flushing fluid system which is suitable for protecting the low-water-content oil well reservoir.

Description

A kind of flushing fluid for low aqueous well
Technical field:
The present invention relates to a kind of flushing fluid, for the reservoir protection of low-water-content oil well.
Background technology:
Oil field in performance history oil well owing to changing pump, the inspection operation such as pump, need to adopt entry well fluid that oil cover annular space and oil pipe are carried out wash cycles, main employing at present adds the aqueous phase of tensio-active agent as flushing fluid, but for the oil well that water ratio is lower, after aqueous phase in entry well fluid invades oil reservoir, meeting and the crude oil generation emulsifying effect in oil reservoir, thus increase the resistance of crude oil flow, make the crude oil flow form in oil reservoir turn into two phase flow from single-phase flow, significantly reduce oil relative permeability. The intrusion of flushing fluid make to resume production after the significantly reduction of oil well output, therefore need to reduce the injury that reservoir layer is caused by flushing fluid for low aqueous well.
The flushing fluid of early application mainly adds the intrusion volume that temporary plugging agent reduces aqueous phase in aqueous phase system, it can be difficult to stop the infiltration of aqueous phase to oil reservoir, and temporary plugging agent also easy polluted reservoir. And traditional oily base working fluid mainly adopts diesel oil system, although the impact on permeability to oil can be reduced, but diesel oil cost is higher, and diesel oil viscosity is lower still has higher intrusion volume, adds the cost of clean-out service.
Summary of the invention:
It is an object of the invention to be provided a kind of for low-water-content oil well cleanup liquid.
The object of the present invention is achieved like this: flushing fluid is that the nano silicon of 15-30nm and biofuel are formed by original particle size, wherein, nano silicon accounts for the 1-5% of gross weight, and its surplus is made a living thing diesel oil, and the weight percentage sum of each component is 100%.
Based on above-mentioned formula, inventor has investigated nano silicon to the stifled temporarily ability of the thickening ability of biofuel and flushing fluid, it has been found that be 10-800 × 10 to rate of permeation-3μm2Sandstone Cores, the filtrate reducing rate of the biofuel of the nano silicon containing 3% can reach 90%, illustrates under the effect of multiviscosisty biofuel, can produce to have good filtrate loss controllability. The crude oil rock core displacement that 55 DEG C of viscosity are 38mPa s is shown, after injecting crude oil, rock core permeability to oil recovery rate reaches 98%, improve more than 80% compared to tradition workover fluid permeability to oil recovery rate, it is a kind of flushing fluid system that can be used for low-water-content oil well.
According to the using method of above-mentioned flushing fluid of the present invention it is: first preparing flushing fluid solution on ground by above-mentioned formula, configuration process is the nano silicon adding 1-5% (weight) in biofuel, it is preferable that concentration is 3%.Flushing fluid is overlapped annular space injection pit shaft from oil and carries out clean-out service by washing well process.
The invention has the beneficial effects as follows: owing to have employed nano silicon, main function is multiviscosisty biofuel and reduces the leak-off velocity of flushing fluid to oil reservoir, and the main function of biofuel is the crude oil dissolved in wash oil cover annular space and oil pipe, compared with prior art, the present invention has following advantage:
(1) biofuel can dissolve the crude oil of wash oil sleeve surface, and the price of biofuel is far below the price of ordinary diesel oil, and biofuel is than the more environmental protection of industrial diesel oil.
(2) biofuel and crude oil have higher mutual solubility, even if entering the relative permeability that oil reservoir also can not affect oil phase, reduce flushing fluid to greatest extent on the pollution of oil reservoir with on the impact of oil well productivity.
(3) nano silicon can increase the viscosity of biofuel system, and has stronger shear thinning behavior, namely lower at injection working cycle viscosity, it is easy to on-the-spot pump enter, at the decrease in flow rate of oil reservoir position liquid, viscosity raises, it is possible to reduce the intrusion volume of flushing fluid to reservoir.
(4) nano silicon forms varigrained particle aggregate in biofuel, it is also possible to play effect that is stifled temporarily and reduction filter loss.
Embodiment:
Below by embodiment, the present invention is described further.
Embodiment 1
Being distributed in biofuel by the nano silicon that original particle size is 15-30nm, the massfraction forming nano silicon is respectively 3 individual system of 1%, 3% and 5%, measures the viscosity of 3 individual system under different shear rate respectively, the results are shown in Table 1. It may be seen that as shearing rate≤0.01S-1Time, the viscosity of system is greater than 6 × 104MPa s, as shearing rate >=80S-1Time, viscosity can be reduced to 120-330mPa s.
The viscosity of table 1 nano silicon multiviscosisty biofuel under different shear rate
Embodiment 2
Being distributed in biofuel by the nano silicon that original particle size is 15-30nm, the massfraction forming nano silicon is respectively 3 individual system of 1%, 3% and 5%, measures the size-grade distribution of nano silicon in 3 individual system. Result shows, nano silicon has wider size-grade distribution in biofuel, and oil reservoir diafiltration face, from 100nm to 30 μm, therefore can be blocked up by particle diameter temporarily.
Embodiment 3
The nano silicon that original particle size is 15-30nm is distributed in biofuel, the massfraction forming nano silicon is respectively 3 individual system of 1%, 3% and 5%, measure the filtrate reducing rate of 3 individual system in the rock core of different rate of permeation, the results are shown in Table 2, as can be seen from the table after rate of permeation raises, filtrate reducing rate starts to reduce, but overall filtrate reducing rate is more than 90%.
The filtrate loss controllability of table 2 flushing fluid
Core permeability/(× 10-3μm2) 54 158 512 786
Filtrate reducing rate/the % of 1% nano silicon 95.4 93.2 90.7 90.0
Filtrate reducing rate/the % of 3% nano silicon 98.5 97.87 94.88 90.3
Filtrate reducing rate/the % of 5% nano silicon 99.4 98.9 97.1 93.4
Embodiment 4
The nano silicon that original particle size is 15-30nm is distributed in biofuel, the massfraction forming nano silicon is respectively 3 individual system of 1%, 3% and 5%, the crude oil rock core displacement that 55 DEG C of viscosity are 38mPa s is shown, after injecting crude oil, rock core permeability to oil recovery rate all reaches 98%, improves more than 80% compared to tradition workover fluid permeability to oil recovery rate.

Claims (2)

1. for a flushing fluid for low-water-content oil well, it is characterized in that, it is that the nano silicon of 15-30nm and biofuel are formed by original particle size, wherein, nano silicon accounts for the 1%-5% of gross weight, and surplus is biofuel, and the weight percentage sum of each component is 100%.
2. flushing fluid according to claim 1, is characterized in that the size-grade distribution of nano silicon in oil phase is that 100nm is to 30 μm.
CN201610121659.1A 2016-03-04 2016-03-04 A kind of flushing fluid for low aqueous well Expired - Fee Related CN105670586B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610121659.1A CN105670586B (en) 2016-03-04 2016-03-04 A kind of flushing fluid for low aqueous well

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610121659.1A CN105670586B (en) 2016-03-04 2016-03-04 A kind of flushing fluid for low aqueous well

Publications (2)

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CN105670586A true CN105670586A (en) 2016-06-15
CN105670586B CN105670586B (en) 2018-08-17

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101735787A (en) * 2009-12-22 2010-06-16 上海大学 Nano material-based water-based oil field injection agent and preparation method thereof
CN101691838B (en) * 2009-10-14 2014-02-26 西安中孚凯宏石油科技有限责任公司 Ultralow permeability oil filed water injection well multicomponent chemical microemulsion pressure reduction and injection gain method
CN104114513A (en) * 2012-02-17 2014-10-22 哈里伯顿能源服务公司 Methods and compositions comprising cement kiln dust having an altered particle size
CN104830296A (en) * 2015-04-30 2015-08-12 中国石油大学(华东) Low-damage filtrate loss reducer for middle and low permeability reservoirs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101691838B (en) * 2009-10-14 2014-02-26 西安中孚凯宏石油科技有限责任公司 Ultralow permeability oil filed water injection well multicomponent chemical microemulsion pressure reduction and injection gain method
CN101735787A (en) * 2009-12-22 2010-06-16 上海大学 Nano material-based water-based oil field injection agent and preparation method thereof
CN104114513A (en) * 2012-02-17 2014-10-22 哈里伯顿能源服务公司 Methods and compositions comprising cement kiln dust having an altered particle size
CN104830296A (en) * 2015-04-30 2015-08-12 中国石油大学(华东) Low-damage filtrate loss reducer for middle and low permeability reservoirs

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
赵永峰等: "有天堵水用反相乳液的制备与性能研究", 《精细石油化工进展》 *

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Granted publication date: 20180817

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