CN107699220A - Offshore oilfield well workover offensive well workover liquid system and its preparation method and application - Google Patents
Offshore oilfield well workover offensive well workover liquid system and its preparation method and application Download PDFInfo
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- CN107699220A CN107699220A CN201710939997.0A CN201710939997A CN107699220A CN 107699220 A CN107699220 A CN 107699220A CN 201710939997 A CN201710939997 A CN 201710939997A CN 107699220 A CN107699220 A CN 107699220A
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- well workover
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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
-
- 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
- C09K8/54—Compositions for in situ inhibition of corrosion in boreholes or wells
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/605—Compositions for stimulating production by acting on the underground formation containing biocides
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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
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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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)
- Inorganic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a kind of offshore oilfield well workover offensive well workover liquid system and its preparation method and application, well workover liquid system is made up of clay stabilizer, high volence metal ion chelating agent, corrosion-retarding germicide and the aqueous solution, wherein, clay stabilizer mass fraction is 2%~2.5%, high volence metal ion chelating agent mass fraction is 0.3%~1.5%, corrosion-retarding germicide mass fraction is 0.8%~1.5%, and remaining is the aqueous solution.The well workover liquid system of the present invention effectively can prevent solid phase particle from being caused damage to reservoir, there is chelation to high volence metal ion simultaneously, avoid it from entering reservoir and produce new precipitation, there is certain sour molten effect to inorganic scale and organic deposition, mitigate its infringement to reservoir, the present invention can effectively suppress the hydration swelling of reservoir CLAY MINERALS AND THEIR SIGNIFICANCE；Antiseptic property is excellent, can effectively protect oil, sleeve pipe and downhole tool, also has bactericidal action to formation fluid, there is well workover liquid system of the invention good storage to protect effect, while have the advantages of cheap.
Description
Technical field
The invention belongs to field of oilfield chemistry, and in particular to a kind of offensive well workover liquid system of offshore oilfield well workover.
Background technology
At present, because the particularity in offshore oilfield geographical position causes freshwater resources relatively valuable, therefore offshore oilfield well workover
The workover fluid used is generally configured by seawater, because Calcium in Seawater, magnesium ion content are higher, after being contacted with stratum water, both
It is incompatible and easily causes stratum knot inorganic scale, influences oil well output.In oil well production operation process, thermodynamic condition or colloid, drip
Blue or green matter solubility changes, and can break colloid, the stable dispersion system of asphalitine, when colloid of the absorption on asphalitine surface
After being dissolved, powered polarity asphaltene molecules will assemble to form floccule body by electrostatic interaction, because floccule body is with just
Electric charge and polarity, easily adsorb on electronegative rock forming mineral surface, cause it to deposit to form organic deposition on reservoir pore throat, surface.
On the other hand, because offshore oilfield some reservoirs have a characteristics such as water-sensitive, speed is quick, after production a period of time, especially water breakthrough, when
When fluid flows in reservoir, change with working condition, easily cause in reservoir clay mineral fine migration and tiny at some
Pore throat, which blocks, causes reservoir permeability to decline.
Therefore, necessary to develop a set of well workover liquid system, the well workover liquid system should have the property that and advantage：Energy
Effectively prevent solid phase particle from being caused damage to reservoir；There is certain sour molten effect to inorganic scale and organic deposition, mitigate it to storage
The infringement of layer；The hydration swelling of reservoir CLAY MINERALS AND THEIR SIGNIFICANCE can effectively be suppressed, reduce fine migration injury；Also have and reservoir simultaneously
The advantages that compatibility is good, cheap.
The content of the invention
A kind of offshore oilfield well workover is provided and repaiied with offensive it is an object of the invention to avoid deficiency of the prior art
Well liquid system and its preparation method and application, it is quick etc. a variety of easily to form inorganic or organic deposition, water-sensitive, speed suitable for offshore oilfield
The workover treatment of Reservoir type oil well.
The purpose of the present invention is achieved through the following technical solutions：
On the one hand, there is provided a kind of offensive well workover liquid system of offshore oilfield well workover, by clay stabilizer, high-valency metal from
Sub- chelating agent, corrosion-retarding germicide and aqueous solution composition, wherein, clay stabilizer mass fraction is 2%~2.5%, high-valency metal
Ion chelating agent mass fraction is 0.3%~1.5%, and corrosion-retarding germicide mass fraction is 0.8%~1.5%, and remaining is water-soluble
Liquid.
As a further improvement, the clay stabilizer is potassium chloride.
As a further improvement, the high volence metal ion chelating agent is disodium EDTA, hydrofluoric acid, benzene
The mixture of formic anhydride.
As a further improvement, the disodium EDTA, hydrofluoric acid, the mixed proportion of benzoyl oxide are 5：
2：3.
As a further improvement, the corrosion-retarding germicide is the mixed of dodecyl dimethyl benzyl group ammonium chloride and allicin
Compound.
As a further improvement, the mixed proportion of the dodecyl dimethyl benzyl group ammonium chloride and allicin is 2：1.
As a further improvement, the aqueous solution is filtering sea or fresh water.
On the other hand, the present invention also provides a kind of system of the offensive well workover liquid system of offshore oilfield well workover as described above
Preparation Method, comprise the following steps：Mud pit is cleaned up, the aqueous solution is filtered and is put into mud pit to after entering well NTU standard values
In, clay stabilizer, high volence metal ion chelating agent, corrosion-retarding germicide are then sequentially added in aqueous by formula, are mixed
Stir, obtain the well workover liquid system.
Another further aspect, the present invention also provide a kind of offensive well workover liquid system as described above oil well process at sea
In application.
The offensive well workover liquid system of offshore oilfield well workover provided by the invention, by clay stabilizer, high volence metal ion
Chelating agent, corrosion-retarding germicide and the aqueous solution composition, wherein, clay stabilizer mass fraction be 2%~2.5%, high-valency metal from
Sub- chelating agent mass fraction is 0.3%~1.5%, and corrosion-retarding germicide mass fraction is 0.8%~1.5%, and remaining is the aqueous solution.
The function of each component and effect are as follows in the workover fluid of the present invention：Clay stabilizer is used to be attached on clay particle surface, prevents
Hydration and expansion of clay；High volence metal ion chelating agent is used to chelate high volence metal ion, and it is in faintly acid to make system；Corrosion-retarding germicide
For delaying corrosion rate of the system to tubing and casing, while kill the bacterium in formation fluid.The beneficial effects of the present invention are：
The well workover liquid system is Solid Free system, effectively can prevent solid phase particle from being caused damage to reservoir；Clay mineral can effectively be prevented
Hydration swelling, prevent fine migration from injuring；There is chelation to high volence metal ions such as calcium, magnesium, avoid it from being produced into reservoir
Raw new precipitation, releases the incompatibility of various liquid phases, while can be hydrolyzed in water, isolates hydrogen ion, and dissolving is inorganic, has
Machine dirt and mud cake etc., the oil reservoir duct of the nearly borehole wall is dredged, releases formation damage, improves reservoir permeability；On steel well
Film forming, can effectively it prevent because oxygen, carbon dioxide, hydrogen sulfide corrode to caused by the metal materials such as oil, sleeve pipe, also simultaneously
There is bactericidal action to formation fluid；Smaller to formation damage, recovery of core permeability reaches more than 90%, has storage well
Layer protecting effect；The well workover liquid system also has the advantages of cheap.
Embodiment
In order that those skilled in the art more fully understands technical scheme, below with specific embodiment to this
Invention is described in further detail, it is necessary to illustrate, in the case where not conflicting, in embodiments herein and embodiment
Feature can be mutually combined.
Embodiment 1：The preparation method of the offensive well workover liquid system of offshore oilfield well workover
Mud pit is cleaned up with seawater, by sea water filter to well NTU (turbidity) value (being less than 30 μm) is entered, cleaned
Mud pit in add filtering sea 30m3, clay stabilizer (potassium chloride) 600kg, high price are then added into mud pit successively
Metal ion chelation agent 150kg, clay stabilizer 300kg, are sufficiently stirred, are well mixed, that is, obtain offensive well workover liquid system,
The mass fraction of wherein clay stabilizer, high volence metal ion chelating agent and corrosion-retarding germicide is respectively 2%, 0.5% and 1%.
Embodiment 2：Compatibility evaluation between well workover liquid system and stratum water, oilfield injection water and crude oil
As described in Example 1, by the mass fraction point of clay stabilizer, high volence metal ion chelating agent and corrosion-retarding germicide
Wei not 2%, 0.5% and 1% preparation well workover liquid system.Well workover liquid system and stratum are investigated under the conditions of room temperature and 80 DEG C respectively
Compatibility between water, oilfield injection water and crude oil.Experimental result is as shown in table 1.
Compatibility evaluation result between the well workover liquid system of table 1 and stratum water, oilfield injection water and crude oil
Test result indicates that：Well workover liquid system and stratum water, well workover liquid system and oil field injection under the conditions of room temperature and 80 DEG C
Compatibility is good between water, well workover liquid system and crude oil and well workover liquid system and stratum water/oilfield injection water/crude oil.
Embodiment 3：The corrosion inhibition evaluation of well workover liquid system
As described in Example 1, by the mass fraction point of clay stabilizer, high volence metal ion chelating agent and corrosion-retarding germicide
2%, 0.5% and 1% well workover liquid system Wei not be prepared, while be not added with the formula corrosion inhibiter contrast and investigate well workover liquid system
Corrosion inhibition.Evaluation method uses corrosion weight loss method, with reference to Chinese GB/10121-88《Metal material laboratory homogeneous corrosion is complete
Soak test method》, CNPC professional standard SY/T5273-91《Oil-field flooding corrosion inhibiter assessment method》.Under the conditions of 80 DEG C,
The corrosion rate of each system is determined after 24h, as a result as shown in table 2.
The corrosion inhibition evaluation result (24h/80 DEG C of experimental period/N80 steel) of the well workover liquid system of table 2
Test result indicates that：When being not added with corrosion-retarding germicide, well workover liquid system is to the average corrosion rate of N80 steel discs
1.04829mm/a, it is far longer than the corrosion rate 0.076mm/a of professional standard；And the well workover liquid system of the present invention is to N80 steel discs
Average corrosion rate be 0.02518mm/a, meet less than 0.076mm/a corrosion rates Industry code requirements, i.e., the present invention
Well workover liquid system there is preferable corrosion inhibition.
Embodiment 4：The clay stabilization performance evaluation of well workover liquid system
As described in Example 1, by the mass fraction point of clay stabilizer, high volence metal ion chelating agent and corrosion-retarding germicide
Not Wei 2%, 0.5% and 1% prepare well workover liquid system, according to China National Petroleum professional standard SY/T5971-2016《Oil gas
Field fracture acidizing and water filling clay stabilizer method of evaluating performance》In centrifugal process calculate well workover liquid system anti-dilative, comment
The clay stability of valency system.Experimental result is as shown in table 3.
The clay stabilization performance evaluation result (80 DEG C of experimental temperature) of the well workover liquid system of table 3
Test result indicates that：The well workover liquid system anti-dilative of the present invention can reach 88.1%, higher than CNOOC's company standard
Defined anti-dilative 85%, showing the well workover liquid system of the present invention has preferable clay stabilization performance.
Embodiment 5：Corrosion performance evaluation of the well workover liquid system to landwaste
As described in Example 1, by the mass fraction point of clay stabilizer, high volence metal ion chelating agent and corrosion-retarding germicide
Wei not 2%, 0.5% and 1% preparation well workover liquid system.With reference to China National Petroleum professional standard SY/T5886-2012《Slowly
Sour method of evaluating performance》In " corrosion rate calculation formula " calculate corrosion rate of the well workover liquid system to landwaste, appraisement system is to rock
Consider corrosion performance to be worth doing.Experimental result is as shown in table 4.
Corrosion Evaluation results of the well workover liquid system of table 4 to landwaste
Test result indicates that：Corrosion rate of the well workover liquid system of the present invention to landwaste shows it to calcareous up to 6.39%
There is certain corrosion Deng cement, the corrosion rate compared to MH acid and landwaste reaction 6h is up to 20%, and corrosion rate is significantly
Reduce, show its cement reaction only soluble with part, certain molten dirt effect can be played, and can ensures reservoir skeleton
Integrality.
Embodiment 6：The reservoir protection performance evaluation of well workover liquid system
As described in Example 1, by the mass fraction point of clay stabilizer, high volence metal ion chelating agent and corrosion-retarding germicide
Wei not 2%, 0.5% and 1% preparation well workover liquid system.With reference to China National Petroleum professional standard SY/T6540-2002《Drilling well
Liquid completion liquid damage reservoir indoor evaluation method》, reservoir protection performance evaluation is carried out to the well workover liquid system of the present invention.Experiment knot
Fruit is as shown in table 5.
The well workover liquid system reservoir protection energy evaluation result of table 5
Test result indicates that：The present invention workover fluid System On Core pollution after, permeability resume figure reached 90% with
On, show that the infringement of the well workover liquid system to reservoir is smaller, there is preferable reservoir protection effect.
Embodiment 7：The application effect of well workover liquid system
As described in Example 1, by the mass fraction point of clay stabilizer, high volence metal ion chelating agent and corrosion-retarding germicide
Not Wei 2%, 0.5% and 1% prepare well workover liquid system, in THE WESTERN SOUTH CHINA SEA oil field, block application effect is as shown in table 6 below.
The well workover liquid system of table 6 is in THE WESTERN SOUTH CHINA SEA oil field block applicable cases
Field application result shows：Using the well workover liquid system of the present invention, the oil well recovery cycle is shorter after workover treatment, is
1~3 day, and the condition of production recovers preferable after well workover, produces liquid (oil) amount before reaching well workover substantially, has good reservoir protection
Effect.
Based on above-described embodiment, offshore oilfield well workover provided by the invention offensive well workover liquid system and preparation method thereof
And application, its well workover liquid system are Solid Free system, effectively can prevent solid phase particle from being caused damage to reservoir；It can effectively prevent from gluing
Native mineral hydration swelling, prevents fine migration from injuring；There is chelation to high volence metal ions such as calcium, magnesium, avoid its entrance
Reservoir produces new precipitation, releases the incompatibility of various liquid phases, while can be hydrolyzed in water, isolates hydrogen ion, dissolves
Inorganic, organic deposition and mud cake etc., the oil reservoir duct of the nearly borehole wall is dredged, release formation damage, improve reservoir permeability；On steel
Good film forming, can effectively it prevent because oxygen, carbon dioxide, hydrogen sulfide corrode to caused by the metal materials such as oil, sleeve pipe,
Also there is bactericidal action to formation fluid simultaneously；Smaller to formation damage, recovery of core permeability reaches more than 90%, has very
Good reservoir protection effect；In addition, the well workover liquid system also has the advantages of cheap.
Many details are elaborated in above description to facilitate a thorough understanding of the present invention, still, the present invention can be with
It is different from other modes described here using other to implement, it is thus impossible to be interpreted as limiting the scope of the invention.
In a word, although the present invention lists above-mentioned preferred embodiment, although it should be noted that those skilled in the art
Member can carry out various change and remodeling, unless such change and remodeling deviate from the scope of the present invention, otherwise should all wrap
Include within the scope of the present invention.
Claims (9)
- A kind of 1. offensive well workover liquid system of offshore oilfield well workover, it is characterised in that：By clay stabilizer, high volence metal ion Chelating agent, corrosion-retarding germicide and the aqueous solution composition, wherein, clay stabilizer mass fraction be 2%~2.5%, high-valency metal from Sub- chelating agent mass fraction is 0.3%~1.5%, and corrosion-retarding germicide mass fraction is 0.8%~1.5%, and remaining is the aqueous solution.
- 2. the offensive well workover liquid system of offshore oilfield well workover according to claim 1, it is characterised in that：The clay is steady It is potassium chloride to determine agent.
- 3. the offensive well workover liquid system of offshore oilfield well workover according to claim 1, it is characterised in that：The high price gold Category ion chelating agent is disodium EDTA, hydrofluoric acid, the mixture of benzoyl oxide.
- 4. the offensive well workover liquid system of offshore oilfield well workover according to claim 3, it is characterised in that：The ethylenediamine Sequestrene AA, hydrofluoric acid, the mixed proportion of benzoyl oxide are 5：2：3.
- 5. the offensive well workover liquid system of offshore oilfield well workover according to claim 1, it is characterised in that：The inhibition is killed Microbial inoculum is the mixture of dodecyl dimethyl benzyl group ammonium chloride and allicin.
- 6. the offensive well workover liquid system of offshore oilfield well workover according to claim 5, it is characterised in that：The dodecane The mixed proportion of base dimethyl benzyl group ammonium chloride and allicin is 2：1.
- 7. offshore oilfield well workover according to any one of claim 1 to 6 is existed with offensive well workover liquid system, its feature In：The aqueous solution is filtering sea or fresh water.
- A kind of 8. offshore oilfield well workover as any one of claim 1 to 7 preparation side of offensive well workover liquid system Method, it is characterised in that comprise the following steps：Mud pit is cleaned up, the aqueous solution is filtered to after entering well NTU standard values and is put into mud pit, then by formula in water Clay stabilizer, high volence metal ion chelating agent, corrosion-retarding germicide are sequentially added in solution, is mixed evenly, is obtained described The offensive well workover liquid system of offshore oilfield well workover.
- 9. a kind of offensive well workover liquid system as any one of claim 1 to 7 is at sea during oil well Using.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710939997.0A CN107699220A (en) | 2017-10-11 | 2017-10-11 | Offshore oilfield well workover offensive well workover liquid system and its preparation method and application |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108641689A (en) * | 2018-06-12 | 2018-10-12 | 中国石油集团渤海钻探工程有限公司 | It is a kind of can be with the liquid and preparation method thereof of water flooding and brine workover fluid compatibility simultaneously |
| CN109054776A (en) * | 2018-09-25 | 2018-12-21 | 中国海洋石油集团有限公司 | A kind of seawater base Solid Free clear brine workover fluid and its preparation method and application |
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| WO2016145344A1 (en) * | 2015-03-12 | 2016-09-15 | Baker Hughes In Corporated | Pcr amplification methods for detecting and quantifying sulfate-reducing bacteria in oilfield fluids |
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| CN1660957A (en) * | 2004-02-23 | 2005-08-31 | 中海石油（中国）有限公司天津分公司 | Cryptomorphic acid conformity type completion fluid |
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Application publication date: 20180216 |