CN105176506B - Density workover fluid and its preparation method in a kind of acid salt Solid Free - Google Patents
Density workover fluid and its preparation method in a kind of acid salt Solid Free Download PDFInfo
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- CN105176506B CN105176506B CN201510587380.8A CN201510587380A CN105176506B CN 105176506 B CN105176506 B CN 105176506B CN 201510587380 A CN201510587380 A CN 201510587380A CN 105176506 B CN105176506 B CN 105176506B
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- acid salt
- solid free
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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
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
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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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- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
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- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses density workover fluid and its preparation methods in a kind of acid salt Solid Free, wherein density workover fluid includes the component of following weight proportion: 39-42 parts of clear water, 56-60.2 parts of sodium dihydrogen phosphates, 0.05-0.3 parts of neopelexes, 0.3-0.5 parts of corrosion inhibiter in the acid salt Solid Free.Density workover fluid performance is stablized in low cost acid salt Solid Free of the invention, density can reach 1.40g/cm3, temperature resistance can reach 160 DEG C, and density workover fluid (density 1.4g/cm3) is free of solid-phase component in inexpensive acid salt Solid Free of the invention, has the advantages that Solid Free, with reducing by 20% or more cost compared with density formates Solid Free well workover liquid system.
Description
Technical field
The present invention relates to density workover fluid in petroleum collection technical field more particularly to a kind of acid salt Solid Free and its match
Method processed.
Background technique
Middle density workover fluid is mainly used for mesohigh oil/gas well workover treatment, to meet equilibrium strata pressure and have protection
Oil-gas Layer effect.The middle-high density workover fluid of domestic and international application is broadly divided into three kinds of systems, high-density slurry system, density at present
Up to 2.6g/cm3More than；Solid free brine system, density reach as high as 2.30g/cm3；High density Water-In-Oil workover fluid, density
In 1.40-2.0g/cm3。
High-density slurry system relies primarily on the suspending power of clay, and addition Paris white, Iron Ore Powder, blanc fixe etc. mention
High density safeguards its rheological property by adding other inorganic agents.It is relatively low with price, the high feature of density, but exist
Heavy weight additive is easy the problems such as precipitating and excessively high solid concentration.
Solid free brine system mainly utilizes calcium bromide, zinc bromide, zinc chloride, formates to aggravate, and forms most high-density
2.3g/cm3Solid free brine workover fluid, have the characteristics that expensive, leakage is big, seriously corroded, be easy fouling, wherein first
Silicate system can overcome corrosion and fouling problem, be high density workover fluid the main direction of development.
High density Water-In-Oil workover fluid adds emulsifier and related oil product is formed, when necessary using density brine as base fluid
Add Solid weighting agents.Applied to high temperature, serious water-sensitive strata, there are environmental-protecting performance, system stability is poor the disadvantages of.
Currently, there are many problems during well workover: such as generalling use brine kill-job and cause formation damage and slab bridge
High operation difficulty of well pressure etc. is filled the water, discrimination mouth deep layer high temperature and pressure is required to the high density workover fluid of protection oil reservoir to solve scene
Shop problem.1.4g/cm is generallyd use for Intermediate High Pressure well at present3Density workover fluid kill-job in liquid calcium is not only easy crystallization
It is unstable, but also can be incompatible with water flooding and scale damage stratum is caused to lead to the underproduction.
Summary of the invention
In view of the above problems, it proposes on the present invention overcomes the above problem or at least be partially solved in order to provide one kind
State density workover fluid and its preparation method in the acid salt Solid Free of problem.
The embodiment of the invention provides density workover fluid in a kind of acid salt Solid Free, density in the acid salt Solid Free
Workover fluid includes the component of following weight proportion:
39-42 parts of clear water, 56-60.2 parts of sodium dihydrogen phosphates, 0.05-0.3 parts of neopelexes, 0.3-0.5 parts
Corrosion inhibiter.
The embodiment of the invention also provides a kind of preparation methods of density workover fluid in acid salt Solid Free, comprising:
Take 39-42 parts of clear water as base fluid；
0.05-0.3 parts of neopelexes are added, are stirred 5 minutes with 3000 rpms of rate；
0.3-0.5 parts of corrosion inhibiter are slowly uniformly added into 0.5 minute, stirring stirs evenly for 10 minutes；
56-60.2 parts of sodium dihydrogen phosphate are slowly added to, is stirred evenly.
The present invention is compared with existing liquid calcium, brine, mud, formates Solid Free high density workover fluid, present invention low cost
Density workover fluid technology has the advantage that in acid salt Solid Free
1, density workover fluid performance is stablized in the inexpensive acid salt Solid Free of the present invention, and density can reach 1.40g/cm3, resist
Temperature can reach 160 DEG C；
2, density workover fluid (density 1.4g/cm in inexpensive acid salt Solid Free of the invention3) be free of solid-phase component, tool
There is the advantages of Solid Free, with reducing by 20% or more cost compared with density formates Solid Free well workover liquid system；
3, the divalent ions such as the calcium and magnesium of density workover fluid without easy fouling in inexpensive acid salt Solid Free of the invention, entirely
Portion's monovalent ion good using compatibility, there is no the risks of blocking reservoir pore throat and stifled card downhole tool, have good
The ability for inhibiting shale expansion has good compatibility with water flooding and reservoir rock and mineral, and will not pollute reservoir causes
The underproduction, recovery of core permeability are greater than 85% or more；
4, density workover fluid detects inorganic agent toxicity used in inexpensive acid salt Solid Free of the invention, knot
Fruit confirms: inorganic agent used is nontoxic, meets environmental requirements.
Specific embodiment
In the following, introducing the technical solution in the present invention by conjunction with specific embodiments.
Embodiment 1:
In the beaker that a volume is 500 milliliters, uses graduated cylinder to measure 40.2 parts of clear water as base fluid, dodecane is first added
0.175 part of base benzene sulfonic acid sodium salt, high-speed stirred 5 minutes, such as be stirred with 3000 rpms of rate；Slowly uniformly add again
Enter 0.4 part of corrosion inhibiter, high-speed stirred 5 minutes, such as be stirred with 3000 rpms of rate；It is eventually adding biphosphate
58 parts of sodium, finished product can be allotted after mixing evenly.
Density workover fluid main component sodium dihydrogen phosphate has good molten in inexpensive acid salt Solid Free of the invention
Xie Xing, density is up to 1.40g/cm3It is shown in Table 1；With good stability, temperature resistance can reach 160 DEG C, be shown in Table 2；Without solid phase at
Point, the divalent ions such as calcium-magnesium-containing, the characteristic with stronger inhibition shale expansion, shale expansion reduced rate are not greater than 70%, see
Table 3；With preferable oil layer protection performance, recovery of core permeability is greater than 85% and is shown in Table 4.
1 sodium dihydrogen phosphate density of table with concentration changing rule
Density workover fluid temperature resistance is evaluated in the inexpensive acid salt Solid Free of the invention of table 2
The expansion test of density workover fluid in the inexpensive acid salt Solid Free of the invention of table 3
Density workover fluid permeability resume figure contrast table in the inexpensive acid salt Solid Free of the invention of table 4
Embodiment 2:
In the beaker that a volume is 500 milliliters, uses graduated cylinder to measure 42 parts of clear water as base fluid, dodecyl is first added
0.05 part of benzene sulfonic acid sodium salt, high-speed stirred 5 minutes, such as be stirred with 3000 rpms of rate；It is slowly uniformly added into again
0.5 part of corrosion inhibiter, high-speed stirred 5 minutes, such as be stirred with 3000 rpms of rate；It is eventually adding sodium dihydrogen phosphate
60.2 parts, finished product can be allotted after mixing evenly.
Density workover fluid density is up to 1.39g/cm in inexpensive acid salt Solid Free of the invention3, have formates without
The good oil layer protection performance of solid phase workover fluid, with 20% or more the cost reduction compared with density formic acid salt system.
Density workover fluid Cost comparisons in the inexpensive acid salt Solid Free of the invention of table 5
Embodiment 3:
In the beaker that a volume is 500 milliliters, uses graduated cylinder to measure 39 parts of clear water as base fluid, dodecyl is first added
0.3 part of benzene sulfonic acid sodium salt, high-speed stirred 5 minutes, such as be stirred with 3000 rpms of rate；It is slowly uniformly added into again slow
0.3 part of agent of erosion, high-speed stirred 5 minutes, such as be stirred with 3000 rpms of rate；It is eventually adding sodium dihydrogen phosphate 56
Part, finished product, density 1.41g/cm can be allotted after mixing evenly3, details are not described herein again.
Compared with liquid calcium in the prior art, brine, mud, formates Solid Free high density workover fluid, the present invention is implemented
Density workover fluid technology has the advantage that in the inexpensive acid salt Solid Free that example provides
1, density workover fluid performance is stablized in the inexpensive acid salt Solid Free of the present invention, and density can reach 1.40g/cm3, resist
Temperature can reach 160 DEG C；
2, density workover fluid (density 1.4g/cm in inexpensive acid salt Solid Free of the invention3) be free of solid-phase component, tool
There is the advantages of Solid Free, with reducing by 20% or more cost compared with density formates Solid Free well workover liquid system；
3, the divalent ions such as the calcium and magnesium of density workover fluid without easy fouling in inexpensive acid salt Solid Free of the invention, entirely
Portion's monovalent ion good using compatibility, there is no the risks of blocking reservoir pore throat and stifled card downhole tool, have good
The ability for inhibiting shale expansion has good compatibility with water flooding and reservoir rock and mineral, and will not pollute reservoir causes
The underproduction, recovery of core permeability are greater than 85% or more；
4, density workover fluid detects inorganic agent toxicity used in inexpensive acid salt Solid Free of the invention, knot
Fruit confirms: inorganic agent used is nontoxic, meets environmental requirements.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (1)
1. density workover fluid in a kind of acid salt Solid Free, which is characterized in that density workover fluid in the acid salt Solid Free
The component of weight proportion are as follows:
39-42 parts of clear water, 56-60.2 parts of sodium dihydrogen phosphates, 0.05-0.3 parts of neopelexes, 0.3-0.5 parts of inhibitions
Agent；
The preparation method of density workover fluid in the acid salt Solid Free are as follows:
Take 39-42 parts of clear water as base fluid；
0.05-0.3 parts of neopelexes are added, are stirred 5 minutes with 3000 rpms of rate；
0.3-0.5 parts of corrosion inhibiter are slowly uniformly added into 0.5 minute, stirring stirs evenly for 10 minutes；
56-60.2 parts of sodium dihydrogen phosphate are slowly added to, is stirred evenly.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510587380.8A CN105176506B (en) | 2015-09-15 | 2015-09-15 | Density workover fluid and its preparation method in a kind of acid salt Solid Free |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510587380.8A CN105176506B (en) | 2015-09-15 | 2015-09-15 | Density workover fluid and its preparation method in a kind of acid salt Solid Free |
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| CN105176506A CN105176506A (en) | 2015-12-23 |
| CN105176506B true CN105176506B (en) | 2018-12-28 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107987806B (en) * | 2016-10-26 | 2020-08-11 | 中国石油天然气股份有限公司 | Monovalent salt weighting agent and preparation method and application thereof |
| CN107338036B (en) * | 2017-06-28 | 2021-01-29 | 唐山冀油瑞丰化工有限公司 | Shrinkage-expansion type solid-free workover fluid and preparation method thereof |
| CN107987812A (en) * | 2017-11-16 | 2018-05-04 | 严希海 | A kind of workover fluid and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1080259A (en) * | 1965-12-31 | 1967-08-23 | Mobil Oil Corp | Well fluid process |
| US4018286A (en) * | 1975-11-06 | 1977-04-19 | Phillips Petroleum Company | Controlled well plugging with dilute polymer solutions |
| CN102131888A (en) * | 2008-08-29 | 2011-07-20 | Pt绿科印度尼西亚公司 | Composition of specifically formulated phosphate salts, used for increasing density of completion fluids, and as a hi -temperature and easy to use completion fluids in the oil and gas industry |
| CN103965844A (en) * | 2013-01-30 | 2014-08-06 | 中国石油天然气股份有限公司 | Low-density microbubble workover fluid |
-
2015
- 2015-09-15 CN CN201510587380.8A patent/CN105176506B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1080259A (en) * | 1965-12-31 | 1967-08-23 | Mobil Oil Corp | Well fluid process |
| US4018286A (en) * | 1975-11-06 | 1977-04-19 | Phillips Petroleum Company | Controlled well plugging with dilute polymer solutions |
| CN102131888A (en) * | 2008-08-29 | 2011-07-20 | Pt绿科印度尼西亚公司 | Composition of specifically formulated phosphate salts, used for increasing density of completion fluids, and as a hi -temperature and easy to use completion fluids in the oil and gas industry |
| CN103965844A (en) * | 2013-01-30 | 2014-08-06 | 中国石油天然气股份有限公司 | Low-density microbubble workover fluid |
Non-Patent Citations (1)
| Title |
|---|
| 用于预防和解除有机垢的修井液添加剂;赵凤兰等;《钻井液与完井液》;第22卷;107-109 * |
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| CN105176506A (en) | 2015-12-23 |
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