CN105176506A - Acid-salt solid-phase-free medium-density workover fluid and preparation method thereof - Google Patents

Acid-salt solid-phase-free medium-density workover fluid and preparation method thereof Download PDF

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Publication number
CN105176506A
CN105176506A CN201510587380.8A CN201510587380A CN105176506A CN 105176506 A CN105176506 A CN 105176506A CN 201510587380 A CN201510587380 A CN 201510587380A CN 105176506 A CN105176506 A CN 105176506A
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China
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density
workover fluid
phase
salt solid
solid free
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CN105176506B (en
Inventor
董军
周宝义
王晓东
张栋
李新建
谢朝钢
赵涛
柴希军
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China National Petroleum Corp
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China National Petroleum Corp
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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
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • 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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  • 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)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Lubricants (AREA)

Abstract

The invention discloses an acid-salt solid-phase-free medium-density workover fluid and a preparation method thereof. The acid-salt solid-phase-free medium-density workover fluid comprises the following components in parts by weight: 39-42 parts of clear water, 56-60.2 parts of sodium dihydrogen phosphate, 0.05-0.3 part of sodium dodecyl benzene sulfonate and 0.3-0.5 part of corrosion inhibitor. The low-cost acid-salt solid-phase-free medium-density workover fluid has stable performance, the density can reach 1.40 g/cm<3>, and the temperature resistance can reach 160 DEG C. The low-cost acid-salt solid-phase-free medium-density workover fluid (with the density of 1.4 g/cm<3>) is free of any solid-phase component, and thus, has the advantage of no solid phase; and compared with the formate solid-phase-free workover fluid system with the same density, the cost is lowered by 20% or above.

Description

A kind of acid salt Solid Free Midst density workover fluid and compound method thereof
Technical field
The present invention relates to petroleum collection technical field, particularly relate to a kind of acid salt Solid Free Midst density workover fluid and compound method thereof.
Background technology
Midst density workover fluid is mainly used in the workover treatment of mesohigh Oil/gas Well, to meet equilibrium strata pressure and to have reservoir protec-tion effect.The middle-high density workover fluid of current domestic and international application is mainly divided into three kinds of systems, high-density slurry system, and density can reach 2.6g/cm 3above; Solid free brine system, density reaches as high as 2.30g/cm 3; High-density water-in-oil workover fluid, density is at 1.40-2.0g/cm 3.
High-density slurry system mainly relies on the suspending power of clay, adding Paris white, powdered iron ore, ground barium sulfate etc. and improves density, safeguarding its rheological property by adding other treatment agents.There is price relatively low, the feature that density is high, but there is weighting agent and easily to precipitate and solid load crosses the problems such as high.
Solid free brine system mainly utilizes Calcium Bromide, zinc bromide, zinc chloride, formate to increase the weight of, and forms most high-density 2.3g/cm 3solid free brine workover fluid, have the features such as expensive, leakage is large, seriously corroded, easily fouling, wherein formate system can overcome corrosion and a fouling difficult problem, is high-density workover fluid main development direction.
High-density water-in-oil workover fluid take density brine as base fluid, adds emulsifying agent and the formation of relevant oil product, adds Solid weighting agents if desired.Be applied to high temperature, serious water-sensitive strata, there is the shortcomings such as environmental-protecting performance, system stability be poor.
At present, in well workover process, there is many difficult problems: as generally adopted bittern kill-job to cause formation damage, and slab bridge water injection well pressure height operational difficulty etc., discrimination mouth deep layer High Temperature High Pressure all needs the high-density workover fluid of formation protection to solve site work problem.Generally 1.4g/cm is adopted at present for Intermediate High Pressure well 3the kill-job of liquid calcium Midst density workover fluid, not only easily crystallization is unstable, but also can be incompatible with local water and cause scale damage stratum to cause the underproduction.
Summary of the invention
In view of the above problems, the present invention is proposed to provide a kind of overcoming the problems referred to above or the acid salt Solid Free Midst density workover fluid solved the problem at least in part and compound method thereof.
Embodiments provide a kind of acid salt Solid Free Midst density workover fluid, described acid salt Solid Free Midst density workover fluid comprises the component of following weight proportioning:
39-42 part clear water, 56-60.2 part SODIUM PHOSPHATE, MONOBASIC, 0.05-0.3 part Sodium dodecylbenzene sulfonate, 0.3-0.5 part inhibiter.
The embodiment of the present invention additionally provides a kind of compound method of acid salt Solid Free Midst density workover fluid, comprising:
Get 39-42 part clear water as base fluid;
Add 0.05-0.3 part Sodium dodecylbenzene sulfonate, stir 5 minutes with the speed of 3000 rpms;
In 0.5 minute, slowly evenly add inhibiter 0.3-0.5 part, stir and stir evenly for 10 minutes;
Slowly add SODIUM PHOSPHATE, MONOBASIC 56-60.2 part, stir evenly.
The present invention compares with existing liquid calcium, bittern, mud, formate Solid Free high-density workover fluid, and low cost acid salt Solid Free Midst density workover fluid technology of the present invention has the following advantages:
1, low cost acid salt Solid Free Midst density workover fluid of the present invention stable performance, density can reach 1.40g/cm 3, temperature resistance can reach 160 DEG C;
2, low cost acid salt Solid Free Midst density workover fluid (density 1.4g/cm of the present invention 3) not containing solid-phase component, there is the advantage of Solid Free, reduce costs more than 20% compared with same density formate Solid Free workover fluid system;
3, low cost acid salt Solid Free Midst density workover fluid of the present invention does not contain the divalent ions such as the calcium magnesium of easy fouling, the monovalent ion that whole employing compatibleness is good, there is not the risk of blocking reservoir pore throat and stifled card subsurface tool, there is the ability of good suppression shale expansion, with local water and reservoir rock and mineral, there is good compatibleness, can not pollute reservoir and cause the underproduction, recovery of core permeability is greater than more than 85%;
4, low cost acid salt Solid Free Midst density workover fluid of the present invention detects treatment agent toxicity used, and result confirms: treatment agent used is nontoxic, meets environmental requirement.
Embodiment
Below, the technical scheme will introduced in conjunction with specific embodiments in the present invention.
Embodiment 1:
Be in the beaker of 500 milliliters at a volume, measure 40.2 parts of clear water as base fluid with graduated cylinder, first add Sodium dodecylbenzene sulfonate 0.175 part, high-speed stirring 5 minutes, such as, stir with the speed of 3000 rpms; Slowly evenly add inhibiter 0.4 part again, high-speed stirring 5 minutes, such as, stir with the speed of 3000 rpms; Finally add SODIUM PHOSPHATE, MONOBASIC 58 parts, after stirring, can finished product be allotted.
Low cost acid salt Solid Free Midst density workover fluid main component SODIUM PHOSPHATE, MONOBASIC of the present invention has good solubility, and density can reach 1.40g/cm 3in table 1; Have satisfactory stability, temperature resistance can reach 160 DEG C, in table 2; Not containing solid-phase component, the not divalent ion such as calcium-magnesium-containing, have the characteristic of stronger suppression shale expansion, shale expansion reduced rate is greater than 70%, in table 3; Have good oil layer protection performance, recovery of core permeability is greater than 85% in table 4.
Table 1 sodium dihydrogen phosphate density is with the Changing Pattern of concentration
Table 2 low cost acid salt of the present invention Solid Free Midst density workover fluid temperature resistance is evaluated
The swell test of table 3 low cost acid salt of the present invention Solid Free Midst density workover fluid
Table 4 low cost acid salt of the present invention Solid Free Midst density workover fluid permeability resume figure contrast table
Embodiment 2:
Be in the beaker of 500 milliliters at a volume, measure 42 parts of clear water as base fluid with graduated cylinder, first add Sodium dodecylbenzene sulfonate 0.05 part, high-speed stirring 5 minutes, such as, stir with the speed of 3000 rpms; Slowly evenly add inhibiter 0.5 part again, high-speed stirring 5 minutes, such as, stir with the speed of 3000 rpms; Finally add SODIUM PHOSPHATE, MONOBASIC 60.2 parts, after stirring, can finished product be allotted.
Low cost acid salt Solid Free Midst density workover fluid density of the present invention can reach 1.39g/cm 3, possess the oil layer protection performance that formate Solid Free workover fluid is good, cost reduces by more than 20% compared with same density formate system.
Table 5 low cost acid salt of the present invention Solid Free Midst density workover fluid Cost comparisons
Embodiment 3:
Be in the beaker of 500 milliliters at a volume, measure 39 parts of clear water as base fluid with graduated cylinder, first add Sodium dodecylbenzene sulfonate 0.3 part, high-speed stirring 5 minutes, such as, stir with the speed of 3000 rpms; Slowly evenly add inhibiter 0.3 part again, high-speed stirring 5 minutes, such as, stir with the speed of 3000 rpms; Finally add SODIUM PHOSPHATE, MONOBASIC 56 parts, can finished product be allotted after stirring, density 1.41g/cm 3, just repeated no more at this.
Compared with liquid calcium of the prior art, bittern, mud, formate Solid Free high-density workover fluid, the low cost acid salt Solid Free Midst density workover fluid technology that the embodiment of the present invention provides has the following advantages:
1, low cost acid salt Solid Free Midst density workover fluid of the present invention stable performance, density can reach 1.40g/cm 3, temperature resistance can reach 160 DEG C;
2, low cost acid salt Solid Free Midst density workover fluid (density 1.4g/cm of the present invention 3) not containing solid-phase component, there is the advantage of Solid Free, reduce costs more than 20% compared with same density formate Solid Free workover fluid system;
3, low cost acid salt Solid Free Midst density workover fluid of the present invention does not contain the divalent ions such as the calcium magnesium of easy fouling, the monovalent ion that whole employing compatibleness is good, there is not the risk of blocking reservoir pore throat and stifled card subsurface tool, there is the ability of good suppression shale expansion, with local water and reservoir rock and mineral, there is good compatibleness, can not pollute reservoir and cause the underproduction, recovery of core permeability is greater than more than 85%;
4, low cost acid salt Solid Free Midst density workover fluid of the present invention detects treatment agent toxicity used, and result confirms: treatment agent used is nontoxic, meets environmental requirement.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (2)

1. an acid salt Solid Free Midst density workover fluid, is characterized in that, described acid salt Solid Free Midst density workover fluid comprises the component of following weight proportioning:
39-42 part clear water, 56-60.2 part SODIUM PHOSPHATE, MONOBASIC, 0.05-0.3 part Sodium dodecylbenzene sulfonate, 0.3-0.5 part inhibiter.
2. a compound method for acid salt Solid Free Midst density workover fluid, is characterized in that,
Get 39-42 part clear water as base fluid;
Add 0.05-0.3 part Sodium dodecylbenzene sulfonate, stir 5 minutes with the speed of 3000 rpms;
In 0.5 minute, slowly evenly add inhibiter 0.3-0.5 part, stir and stir evenly for 10 minutes;
Slowly add SODIUM PHOSPHATE, MONOBASIC 56-60.2 part, stir evenly.
CN201510587380.8A 2015-09-15 2015-09-15 Density workover fluid and its preparation method in a kind of acid salt Solid Free Active CN105176506B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107338036A (en) * 2017-06-28 2017-11-10 唐山冀油瑞丰化工有限公司 Swollen type Solid Free workover fluid of one kind contracting and preparation method thereof
CN107987812A (en) * 2017-11-16 2018-05-04 严希海 A kind of workover fluid and preparation method thereof
CN107987806A (en) * 2016-10-26 2018-05-04 中国石油天然气股份有限公司 Monovalent salt weighting agent and preparation method and application thereof

Citations (4)

* Cited by examiner, † Cited by third party
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 micro-bubble workover fluid

Patent Citations (4)

* Cited by examiner, † Cited by third party
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 micro-bubble workover fluid

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
赵凤兰等: "用于预防和解除有机垢的修井液添加剂", 《钻井液与完井液》 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107987806A (en) * 2016-10-26 2018-05-04 中国石油天然气股份有限公司 Monovalent salt weighting agent and preparation method and application thereof
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
CN107338036A (en) * 2017-06-28 2017-11-10 唐山冀油瑞丰化工有限公司 Swollen type Solid Free workover fluid of one kind contracting and preparation method 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

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