CN108624309A - No native phase high inhibition shields environment-friendly type well killing fluid - Google Patents
No native phase high inhibition shields environment-friendly type well killing fluid Download PDFInfo
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- CN108624309A CN108624309A CN201710264181.2A CN201710264181A CN108624309A CN 108624309 A CN108624309 A CN 108624309A CN 201710264181 A CN201710264181 A CN 201710264181A CN 108624309 A CN108624309 A CN 108624309A
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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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
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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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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The present invention relates to oil recovery technologies, especially environment-friendly type well killing fluid is shielded without native phase high inhibition, the calcium carbonate superfine powder of sodium carboxymethylcellulose CMC HV of xanthans XC, Y unit volume, the polymer filtrate reducer SP 8 of Z unit volumes, S unit volumes including X unit volume, the powdered calcium chloride of carboxymethyl starch CMS, the M unit volume of L unit volumes and the water of N unit volumes；X=2 3, Y=2 3, Z=0 2, S=50 100, L=0 10, M=300 400, N=482 646, X+Y+Z+S+L+M+N=1000, M are less than or equal to the biggest quality for the powdered calcium chloride being completely dissolved by the water of N unit volumes in 15 DEG C of 25 DEG C of physical environments.The present invention can be further reduced fluid loss（Filter loss）It is low; the liquid lock injury caused by reservoir due to filter loss is big can be overcome well; rheological characteristic is good; various kill-job operations and associated construction can be met; it is low compared with non-fixed phase well control fluid in cost under equal densities; function that is low to reservoir damage and having both environmental protection and reservoir protection, can restore oil well output to greatest extent after workover treatment.
Description
Technical field
The present invention relates to oil recovery technologies, belong to the improvement of well killing fluid ingredient, especially without native phase high inhibition shading ring
Guarantor's type well killing fluid.
Background technology
With the development of China Petroleum decades, many oil gas fields enter development late stage, and well workover number constantly increases
Add, the quality requirement of well workover is also continuously improved, according to incompletely statistics, the bad conventional Well Killing liquid of performance can make oil/gas well
Production capacity is generally reduced 30-50%, and main cause is that external solid phase blocks reservoir pore space, and production capacity is caused to reduce.Therefore, how to drop
Low external solid phase is particularly important to the injury of reservoir.Currently, though general non-fixed phase well control fluid can overcome external solid phase pair well
The damage of reservoir, but that there are vectors is big for non-fixed phase well control fluid, the density of no suspension and brine with weather, temperature influence compared with
Greatly, expensive technical disadvantages.Therefore, the certain additives for high density solids free saltwater killing fluid being added can overcome the technology
Disadvantage becomes the key technology of such well killing fluid practical application.
It is a large amount of research shows that：During workover treatment, damage of the well killing fluid to oil reservoir is mainly that solid phase blocks rock
Duct and the property of rock is caused to change, meanwhile, native phase content is higher in conventional Well Killing liquid, into the sub-micro of reservoir pore space
Meter level soil phase particle can cause permanent damage to reservoir permeability.
Invention content
Environment-friendly type well killing fluid being shielded without native phase high inhibition the purpose of the present invention is to provide a kind of, dehydration can be further reduced
Amount (filter loss) is low, can overcome the liquid lock injury caused by reservoir due to filter loss is big well.
The object of the present invention is achieved like this：It is a kind of to shield environment-friendly type well killing fluid, including X unit body without native phase high inhibition
Polymer filtrate reducer SP-8, S of sodium carboxymethylcellulose CMC-HV, Z unit volume of long-pending xanthans XC, Y unit volume
The calcium carbonate superfine powder of unit volume, the powdered calcium chloride and N units of carboxymethyl starch CMS, the M unit volume of L unit volumes
The water of volume；X=2-3, Y=2-3, Z=0-2, S=50-100, L=0-10, M=300-400, N=482-646, X+Y+Z+S
+ L+M+N=1000, M are powdered less than or equal to being completely dissolved by the water of N unit volumes in 15 DEG C of -25 DEG C of physical environments
The biggest quality of calcium chloride.
The present invention is for the disadvantage the most serious of the opposite reservoir permeability damage of soil in workover treatment, to protect reservoir to ooze
Saturating rate is target, with damaging with preferable inhibition and low solid phase conducive to protection reservoir.The basic component of the present invention is by adding
Heavy prescription (inorganic salts), modified starch, tackifier, fluid loss additive, inorganic salts crystallization inhibitor, surfactant, acid-soluble shielding
The compositions such as diverting agent, corrosion inhibiter.The suspending agent of the present invention is using naturally biodegradable guar gum, xanthans XC or polyacrylamide etc.
Polysaccharide high-molecular compound, by preferably selecting xanthans XC.The tackifier of the present invention are more using degradable vinyl monomer
Membered copolymer PAC-141, the high viscous cellulose substances such as sodium carboxymethylcellulose CMC-HV or flow pattern regulator 80A51, pass through
It is good and have both the height of thickening and filtrate reducing and glue sodium carboxymethylcellulose CMC-HV to preferably select salt resistance effect.The filtrate reducing of the present invention
Agent is using walchowite, ferrochrome lignosulfonate or carboxymethyl starch CMS etc., by preferably selecting degradable salt resistance effect
Preferable carboxymethyl starch CMS.The middle molecule fluid loss additive of the present invention is using suppressive fluid loss additive JT-888, polymer drop filter
Agent MAN-101 or polymer filtrate reducer SP-8 is lost, by preferably selecting the preferable polymer filtrate reducer SP- of salt resistance calcium ability
8, heavy weight additive of the invention selects the container horizon protective agent calcium carbonate superfine powder of acid decomposable.The inhibitor of the present invention selects inorganic salt powder
Shape calcium chloride.Xanthans XC, CMC-HV, SP-8, calcium carbonate superfine powder, powdered calcium chloride and water are made by certain volume proportioning
The present invention can solve the technical barrier of the oil/gas well underproduction caused by the opposite reservoir permeability of soil in workover treatment, meanwhile, it is lazy
The property acid soluble container horizon protective agent calcium carbonate superfine powder of solid phase can be by pickling or negative pressure deblocking to disappear after kill-job operation
Except the influence of shading ring, restore reservoir infiltration.
The technological merit of the present invention：1. free clay phase, which can effectively prevent native phase particle, enters oil/gas well caused by reservoir pore space
The underproduction；2. inertia solid phase is the shield type container horizon protective agent that can be acid hydrolysis, can be carried out after the completion of kill-job operation pickling releasing or
Negative pressure deblocking restores reservoir infiltration to clear up shading ring；3. filtrate viscosity is low, liquid phase is easy to counter and arranges；4. for strong retraction
Layer has very strong rejection ability；5. it is good with formation fluid compatibility, it is not easy to generate precipitation with formation fluid；6. rheological characteristic is good, energy
It is well adapted for kill-job operation and related operation；7. salt resistance calcium ability is strong, can resist to saturation；8. mixed with this hair of container horizon protective agent
It is bright at low cost compared with non-fixed phase well control fluid when identical as non-fixed phase well control fluid density.
It is low that the present invention can be further reduced fluid loss (filter loss), can overcome well and be caused to reservoir because filter loss is big
Liquid lock injury, rheological characteristic is good, can meet various kill-job operations and associated construction, compared with Solid Free in cost under equal densities
Well killing fluid is low, function that is low to reservoir damage and having both environmental protection and reservoir protection, can maximum limit after workover treatment
Degree restores oil well output.
Specific implementation mode
It is a kind of to shield environment-friendly type well killing fluid, including xanthans XC, Y unit volume of X unit volume without native phase high inhibition
The calcium carbonate superfine powder of polymer filtrate reducer SP-8, S unit volume of sodium carboxymethylcellulose CMC-HV, Z unit volume, L are mono-
The powdered calcium chloride of carboxymethyl starch CMS, the M unit volume of position volume and the water of N unit volumes；X=2-3, Y=2-3, Z
=0-2, S=50-100, L=0-10, M=300-400, N=482-646, X+Y+Z+S+L+M+N=1000, M are less than or equal to
The biggest quality for the powdered calcium chloride being completely dissolved by the water of N unit volumes in 15 DEG C of -25 DEG C of physical environments.
Do not include polymer filtrate reducer SP-8, Z=0, X+Y+S+L+M+N=1000.
Further include polymer filtrate reducer SP-8, Z=2, X+Y+S+L+M+N=998.
Do not include carboxymethyl starch CMS, L=0, X+Y+S+M+N=998.
Further include carboxymethyl starch CMS, L=10, X+Y+S+M+N=988.
When the newly formed present invention is 24 hours enough by maintenance in 15 DEG C of -25 DEG C of physical environments of room temperature, performance is stablized, and loses
Water (filter loss) is low, and the mud cake of generation is comparatively dense, and main working performance data are as shown in table 1.
Table 1
The newly formed present invention is placed in 80 DEG C of physical environments from 15 DEG C of -25 DEG C of physical environments of room temperature by heating enough 16
When being cooled to 15 DEG C -25 DEG C of room temperature after hour again, fluid loss (filter loss) rises, and viscosity reduces, and egress reduces, main
Working performance data are as shown in table 2.
Table 2
The newly formed present invention in 15 DEG C of -25 DEG C of physical environments of room temperature in 80 DEG C of physical environments after being heated 16 hours
Plastic is stood again and through abundant convention stir when broken glue, main working performance data are as shown in table 3.
Table 3
According to table 3, the present invention in 15 DEG C of -25 DEG C of physical environments of room temperature in 80 DEG C of physical environments after being heated 16 hours
When standing 16 hours again, it may appear that colloid condensation phenomenon when losing flowability, but being reached 15 minutes through convention stir, restores flowing
Property, but the variation before the relatively broken glue of rheological characteristic is little, and fluid loss (filter loss) is than the reduction before broken glue.
Colloid condenses the reason of being formed：Heating or be added electrolyte in colloid makes colloidal solution that cohesion occur,
The result of cohesion is dispersed in the micelle in dispersant and is condensed into larger particle mutually to be precipitated from dispersant, precipitation
Substance is called precipitation.It is this to be precipitated as gelatinous precipitate to be different from the crystal being precipitated from solution.It is colloid to generate gelatinous precipitate
The general type of cohesion, micelle and dispersant are condensed into an entirety after coacervation of colloid in some cases, become a kind of jelly shape
Object, this jelly shape object is gel.Separately there are a kind of colloid condensation phenomenon occur, coagulation to be mainly in molecular colloid, such as：
It under certain condition, can be with the webbed structure of shape and whole when temperature reduces and colloidal dispersions matter concentration is sufficiently large
Dispersant envelope gets up, and forms an entirety, it is also a kind of gelatin substance, referred to as frozen glue, and frozen glue is also sometimes referred to as solidifying
Glue, but it is different from the jelly gel of shape object is shown as, and it is reversible, it can be made to restore using the methods of heating or mechanical agitation
For colloid.Therefore, it is possible to determine that, heating the reason of colloid occurred after standing condenses phenomenon is：Temperature can be formed after reducing
Frozen glue.
By experimental method verification it can be seen that：The method for eliminating the frozen glue formed after formula heating is stood has：1, conventional
Stirring can make the present invention restore mobility, and Dynamic Plastic cuts uniform rising, and the present invention can also form frozen glue after secondary long-time is stood.
2, the present invention can restore mobility automatically after heating.3, high-speed stirred more faster than convention stir rotating speed can make the present invention restore stream
Dynamic property and enough after ten minutes by high-speed stirred, will not form frozen glue, but appropriateness generates gel, passes through after long-time is stood
The present invention can restore rheological characteristic after gentle agitation.
When the newly formed present invention is 24 hours enough by maintenance in 15 DEG C of -25 DEG C of physical environments of room temperature, groundwork
Energy data are as shown in table 4.
Table 4
The newly formed present invention is placed in 80 DEG C of physical environments from 15 DEG C of -25 DEG C of physical environments of room temperature by heating enough 16
When 15 DEG C -25 DEG C of room temperature is cooled to after hour again and being reached 15 minutes through convention stir, main working performance data such as 5 institute of table
Show.
Table 5
It is existing not occur layering when the newly formed present invention stands 48 hours enough in 15 DEG C of -25 DEG C of physical environments of room temperature
As main working performance data are as shown in table 6.
Table 6
The newly formed present invention is placed in 80 DEG C of physical environments from 15 DEG C of -25 DEG C of physical environments of room temperature by heating enough 16
When 15 DEG C -25 DEG C of room temperature is cooled to after hour again and being reached 15 minutes through convention stir, main working performance data such as 7 institute of table
Show.
Table 7
The newly formed present invention is placed in 80 DEG C of physical environments from 15 DEG C of -25 DEG C of physical environments of room temperature by heating enough 16
It is main when being cooled to 15 DEG C -25 DEG C of room temperature after hour again and being reached 10 minutes through the high-speed stirred that rotating speed is 12000r/min
Working performance data are as shown in table 8.
Table 8
According to table 4, table 5 and table 6- tables 8, the present invention mixed with the carboxymethyl starch CMS of 10 volume units,
Fluid loss (filter loss) significantly reduce and be less than 10mL, but by after aging the present invention carry out high-speed stirred after, do not occur
Plastic phenomenon.
For the newly formed present invention in 15 DEG C of -25 DEG C of physical environments of room temperature, main working performance data are as shown in table 9.
Table 9
The newly formed present invention is placed in 80 DEG C of physical environments from 15 DEG C of -25 DEG C of physical environments of room temperature by heating enough 16
When being cooled to 15 DEG C -25 DEG C of room temperature after hour again and being reached 15 minutes through abundant convention stir, main working performance data are such as
Shown in table 10.
Table 10
According to table 9- tables 10, the present invention in the case of certain SP-8 remains to that fluid loss (filter loss) is kept to be less than 5mL,
Fluid loss (filter loss) smaller after aging.
The newly formed present invention is by enough 24 hours of maintenance and abundant through convention stir in 15 DEG C of -25 DEG C of physical environments of room temperature
When, main working performance data are as shown in table 11.
Table 11
The newly formed present invention, which is placed on from 15 DEG C of -25 DEG C of physical environments of room temperature in 90 DEG C of physical environments, is heated to 90
DEG C and keep 90 DEG C be cooled to again within 24 hours 15 DEG C -25 DEG C of room temperature and it is abundant through convention stir when, main working performance number
According to as shown in table 12.
Table 12
According to table 11 and table 12, the upper layer of the present invention in tank body is contained in substantially without clear liquid, upper liquid density is 1.58g/
cm3, subnatant density is 1.59g/cm3, stretch into tank body with glass bar and the present invention bottomed out, tank body inner bottom surface is without precipitation, stream
Dynamic property is good.
The newly formed present invention, which is placed on from 15 DEG C of -25 DEG C of physical environments of room temperature in 100 DEG C of physical environments, to be heated to
100 DEG C and keep 100 DEG C be cooled to again within 24 hours 15 DEG C -25 DEG C of room temperature and it is abundant through convention stir when, groundwork
Energy data are as shown in table 13.
Table 13
According to table 13, there is the clear liquid of 4mm thickness in the upper layer of the present invention being contained in tank body, and upper liquid density is 1.57g/
cm3, subnatant density is 1.60g/cm3, stretch into tank body with glass bar and the present invention bottomed out, tank body inner bottom surface is without precipitation, stream
Dynamic property is good.In 100 DEG C of physical environments, Inventive polymers class host agent, by high temperature degradation, causes itself outstanding in salt water part
Floating capacity reduces and fluid loss (filter loss) increases, although its fluid loss (filter loss) increases, whole rheological characteristic still can be full
Sufficient kill-job demand.
Claims (5)
1. a kind of shielding environment-friendly type well killing fluid without native phase high inhibition, it is characterised in that：Xanthans XC, Y including X unit volume are mono-
The ultra-fine carbon of polymer filtrate reducer SP-8, S unit volume of sodium carboxymethylcellulose CMC-HV, Z unit volume of position volume
Sour calcium, the powdered calcium chloride of carboxymethyl starch CMS, the M unit volume of L unit volumes and the water of N unit volumes；X=2-3, Y=
2-3, Z=0-2, S=50-100, L=0-10, M=300-400, N=482-646, X+Y+Z+S+L+M+N=1000, M are less than or equal to
The biggest quality for the powdered calcium chloride being completely dissolved by the water of N unit volumes in 15 DEG C of -25 DEG C of physical environments.
2. according to claim 1 shield environment-friendly type well killing fluid without native phase high inhibition, it is characterized in that：Do not include that polymer drops
Fluid loss agents SP-8, Z=0, X+Y+S+L+M+N=1000.
3. according to claim 1 shield environment-friendly type well killing fluid without native phase high inhibition, it is characterized in that：It further include polymer drop
Fluid loss agents SP-8, Z=2, X+Y+S+L+M+N=998.
4. according to claim 3 shield environment-friendly type well killing fluid without native phase high inhibition, it is characterized in that：Do not include that carboxymethyl forms sediment
Powder CMS, L=0, X+Y+S+M+N=998.
5. according to claim 3 shield environment-friendly type well killing fluid without native phase high inhibition, it is characterized in that：Further include that carboxymethyl forms sediment
Powder CMS, L=10, X+Y+S+M+N=988.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710264181.2A CN108624309A (en) | 2017-04-21 | 2017-04-21 | No native phase high inhibition shields environment-friendly type well killing fluid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710264181.2A CN108624309A (en) | 2017-04-21 | 2017-04-21 | No native phase high inhibition shields environment-friendly type well killing fluid |
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| CN108624309A true CN108624309A (en) | 2018-10-09 |
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| CN201710264181.2A Withdrawn CN108624309A (en) | 2017-04-21 | 2017-04-21 | No native phase high inhibition shields environment-friendly type well killing fluid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110305640A (en) * | 2019-06-19 | 2019-10-08 | 中国煤炭地质总局第一勘探局地质勘查院 | A kind of clay-free drilling fluid and its application |
| CN112574722A (en) * | 2019-09-30 | 2021-03-30 | 中国石油化工股份有限公司 | Harmless solid-phase well killing fluid and preparation method thereof |
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| CN101555404A (en) * | 2009-05-20 | 2009-10-14 | 大庆开发区东油新技术有限公司 | Environment-friendly low-damage solidfree well control fluid and applications thereof |
| CN102533232A (en) * | 2010-12-13 | 2012-07-04 | 中国石油天然气股份有限公司 | Solid-phase-free multifunctional well completion working fluid |
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2017
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Patent Citations (3)
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| CN101555404A (en) * | 2009-05-20 | 2009-10-14 | 大庆开发区东油新技术有限公司 | Environment-friendly low-damage solidfree well control fluid and applications thereof |
| CN102533232A (en) * | 2010-12-13 | 2012-07-04 | 中国石油天然气股份有限公司 | Solid-phase-free multifunctional well completion working fluid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110305640A (en) * | 2019-06-19 | 2019-10-08 | 中国煤炭地质总局第一勘探局地质勘查院 | A kind of clay-free drilling fluid and its application |
| CN112574722A (en) * | 2019-09-30 | 2021-03-30 | 中国石油化工股份有限公司 | Harmless solid-phase well killing fluid and preparation method thereof |
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Application publication date: 20181009 |