CN105647491A - Solid-phase-free high density well killing fluid - Google Patents
Solid-phase-free high density well killing fluid Download PDFInfo
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- CN105647491A CN105647491A CN201510900965.0A CN201510900965A CN105647491A CN 105647491 A CN105647491 A CN 105647491A CN 201510900965 A CN201510900965 A CN 201510900965A CN 105647491 A CN105647491 A CN 105647491A
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- high density
- free high
- well control
- solid free
- control fluids
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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
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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- 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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- 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)
Abstract
The invention discloses a solid-phase-free high density well killing fluid, which comprises the following components in percentage by weight: 0.1 to 0.5% of deoxidant, 0.5 to 3.0% of corrosion inhibitor, 40 to 70% of composite salt weighting agent, 5 to 15% of crystallization inhibitor, 0.1 to 1.5% of water locking resistant agent, and the balance being water, wherein the water locking resistant agent is prepared by compounding perfluoro octyl carboxylic acid polyoxyethylene ether, alkylphenol polyoxyethylene ether, and methanol/ethanol. The provided solid-phase-free high density well killing fluid has the advantages of no solid phase, low system viscosity, strong anticorrosion performance, little biological toxicity, good reservoir compatibility, and simple and convenient onsite preparation, and solves the problems that conventional well killing fluids have bad reservoir compatibility and thermal stability; crystallization and agglomeration happen when the density of well killing fluid is adjusted for a second time, and solid phase in the well killing fluid damages the reservoir that is next to the well for a second time. The comprehensive performance of well killing fluid is improved.
Description
Technical field
The present invention relates to technical field of chemistry, in particular to a kind of Solid Free high density well control fluids.
Background technology
At present, along with the continuous expansion of China's offshore oil exploration and exploitation scale, CNOOC's Bohai Bay Oil, PetroChina Company Limited.'s (NW Hebei, Liaohe Oil Field, Dagang Oilfield), China Petrochemical Industry's Shengli Oil Field etc. increase the exploration dynamics of Bohai Sea Gulf block year by year, new high temperature, high pressure and deep well get more and more, and its oil test operation demand is also increasing.
Meanwhile, enter the old block exploitation well of exploitation middle and later periods, such as Dagang Oilfield Cheng Hai mono-district, field of razor clam Hai Erqu etc., the demand of workover treatment (borehole operation, oil well overhaul) is also increasing. In the drilled well of new exploration acreage, such as strand, huge port block, NW Hebei NP403 �� 1 block etc., mostly have that storage buried depth is big, reservoir pressure coefficient height (1.05��1.50), reservoir temperature height (110 DEG C��155 DEG C), hole ooze the reservoir characteristics such as low, reservoir properties is poor,, in new prospecting borehole formation testing and old well workover treatment process, conventional well control fluid exists that reservoir compatibleness is poor, poor heat stability, to the problem occurring crystallization caking and solid phase existence to cause to injure for two times to nearly well reservoir during well killing fluid density two adjustment.
Summary of the invention
The embodiment of the present invention provides a kind of Solid Free high density well control fluids, for solving, the reservoir compatibleness that in prior art, conventional well control fluid exists is poor, poor heat stability, to the technical problem occurring crystallization caking and solid phase existence to cause to injure for two times to nearly well reservoir during well killing fluid density two adjustment.
The embodiment of the present application provides a kind of Solid Free high density well control fluids, comprising:
Oxygen scavenger, inhibiter, composite salt weighting agent, crystallization inhibitor, Waterproof lock agent and water;
Wherein, in described Solid Free high density well control fluids, the mass percent of each component is: described oxygen scavenger 0.1��0.5%, described inhibiter 0.5��3.0%, described composite salt weighting agent 40��70%, described crystallization inhibitor 5��15%, described Waterproof lock agent 0.1��1.5%, all the other are water;Described Waterproof lock agent is composited by perfluoro capryl carboxylic acid Soxylat A 25-7, alkylphenol polyoxyethylene and methyl alcohol or ethanol.
Optionally, in described Solid Free high density well control fluids, the mass percent of each component is: described oxygen scavenger 0.1��0.2%, described inhibiter 0.5��3.0%, described composite salt weighting agent 40��50%, described crystallization inhibitor 5��8%, described Waterproof lock agent 0.1��0.5%, all the other are water.
Optionally, in described Solid Free high density well control fluids, the mass percent of each component is: described oxygen scavenger 0.2��0.3%, described inhibiter 0.5��3.0%, described composite salt weighting agent 50��60%, described crystallization inhibitor 8��10%, described Waterproof lock agent 0.5��1.0%, all the other are water.
Optionally, in described Solid Free high density well control fluids, the mass percent of each component is: described oxygen scavenger 0.3��0.5%, described inhibiter 0.5��3.0%, described composite salt weighting agent 60��70%, described crystallization inhibitor 10��15%, described Waterproof lock agent 1.0��1.5%, all the other are water.
Optionally, described composite salt weighting agent is specially: the mixture of potassium formiate, formic acid caesium.
Optionally, described crystallization is kept: aminopolycanboxylic acid's salt.
Optionally, described oxygen scavenger is specially: the compound of Sulfothiorine and thiocarbamide, and compound proportion is 1:3.
Optionally, described inhibiter is specially: the mixture of Mannich base and chlorination 2-alkyl-1-tetrahydroglyoxaline-1-hexadecyldimethyl benzyl ammonium soap, or, the mixture of Mannich base and N-polyoxyethylene-2-amine ethyl-tetrahydroglyoxaline-1-hexadecyldimethyl benzyl ammonium soap.
Above-mentioned one or more technical scheme in the embodiment of the present application, at least has following technique effect:
A kind of Solid Free high density well control fluids that the embodiment of the present application provides has: Solid Free exists, system viscosity is low, resistance to corrosion is strong, bio-toxicity is little, reservoir compatibleness is good, the advantages such as extemporaneous preparation simple and fast, solve conventional well control fluid reservoir compatibleness in prior art poor, poor heat stability, the technical problem causing to injure for two times to nearly well reservoir is there is to there is crystallization caking and solid phase during well killing fluid density two adjustment, be conducive to protection oil and gas reservoir, avoid stratum outside fluid to the two of reservoir injuries, can effectively ensure oil gas well Oil testing simultaneously, smooth enforcement kill operation in well workover process.
Embodiment
In the technical scheme that the embodiment of the present application provides, thering is provided a kind of Solid Free high density well control fluids, this well control fluid has following significantly feature: Solid Free exists, system viscosity is low, resistance to corrosion is strong, bio-toxicity is little, reservoir compatibleness is good, extemporaneous preparation simple and fast. It is beneficial to protection oil and gas reservoir, avoids stratum outside fluid to the two of reservoir injuries, can effectively ensure the smooth enforcement kill operation in oil gas well Oil testing, well workover process simultaneously.
Below the main of the embodiment of the present application technical scheme is realized principle, embodiment and the useful effect that should be able to reach it is explained in detail.
Embodiment
The embodiment of the present application provides a kind of Solid Free high density well control fluids, comprise: oxygen scavenger, inhibiter, composite salt weighting agent, crystallization inhibitor, Waterproof lock agent and water, wherein, the mass percentage of each component is: oxygen scavenger 0.1��0.5%, inhibiter 0.5��3.0%, composite salt weighting agent 40��70%, efficient crystallization inhibitor 5��15%, Waterproof lock agent 0.1��1.5%, all the other are water, and each constituent mass per-cent sum is 100%.
In this Solid Free high density well control fluids: oxygen scavenger can be the compound of Sulfothiorine and thiocarbamide, and compound proportion is 1:3, and compound proportion herein refers to weight ratio;
Inhibiter can be Mannich base and the mixture of chlorination 2-alkyl-1-(N-polyoxyethylene-2-amine ethyl) tetrahydroglyoxaline-1-hexadecyldimethyl benzyl ammonium soap, this inhibiter at 160 DEG C, rate of metal corrosion��0.067mm/a;
Composite salt weighting agent can be the mixture of potassium formiate, formic acid caesium;
It can be aminopolycanboxylic acid's salt that efficient crystallization suppresses;
High-effective water-proof lock agent can for perfluoro capryl carboxylic acid Soxylat A 25-7, alkylphenol polyoxyethylene is composite with methyl alcohol or ethanol and becomes. Under 0.5% amount of adding (mass ratio), 30 DEG C of conditions, surface tension��25.0mN/m, interfacial tension��0.8mN/m.
The advantage of the above-mentioned Solid Free high density well control fluids that the embodiment of the present application provides and useful effect:
(1) Solid Free exists, density 1.50-1.80g/cm3Adjustable; (2) system viscosity is low; (3) resistance to corrosion is strong; (4) bio-toxicity is little; (5) reservoir compatibleness is good; (6) extemporaneous preparation simple and fast.
This well control fluid is beneficial to protection oil and gas reservoir, avoids stratum outside fluid to the two of reservoir injuries, can effectively ensure the smooth enforcement kill operation in oil gas well Oil testing, well workover process simultaneously.
Below by 3 distance examples, the embodiment of the present application provides a kind of Solid Free high density well control fluids and performance thereof are described in detail:
Example 1:
The component of this Solid Free high density well control fluids and mass percentage thereof be: oxygen scavenger 0.1��0.2%, inhibiter 0.5��3.0%, composite salt weighting agent 40��50%, efficient crystallization inhibitor 5��8%, Waterproof lock agent 0.1��0.5%, all the other are water, and each weight percentages of components sum is 100%.
A kind of Solid Free high density well control fluids that this example 1 provides is applicable to low porosity and low permeability, well temperature��150 DEG C, reservoir pressure coefficient are 1.5��1.6g/cm3Reservoir Oil testing, well workover.
Example 2:
The component of this Solid Free high density well control fluids and mass percentage thereof be: oxygen scavenger 0.2��0.3%, inhibiter 0.5��3.0%, composite salt weighting agent 50��60%, efficient crystallization inhibitor 8��10%, Waterproof lock agent 0.5��1.0%, all the other are water, and each weight percentages of components sum is 100%.
A kind of Solid Free high density well control fluids that this example 2 provides is applicable to low porosity and low permeability, well temperature 150��165 DEG C, reservoir pressure coefficient are 1.6��1.7g/cm3Reservoir Oil testing, well workover.
Example 3:
The component of this Solid Free high density well control fluids and mass percentage thereof be: oxygen scavenger 0.3��0.5%, inhibiter 0.5��3.0%, composite salt weighting agent 60��70%, efficient crystallization inhibitor 10��15%, Waterproof lock agent 1.0��1.5%, all the other are water, and each weight percentages of components sum is 100%.
A kind of Solid Free high density well control fluids that this example 3 provides is applicable to low porosity and low permeability, well temperature 165��180 DEG C, reservoir pressure coefficient are 1.7��1.8g/cm3Reservoir Oil testing, well workover.
The feature performance benefit of a kind of Solid Free high density well control fluids that above-described embodiment provides and useful effect, show from following test result.
One, the apparent viscosity performance evaluation of a kind of Solid Free high density well control fluids
The apparent viscosity performance of a kind of Solid Free high density well control fluids that experimental test example 1��3 provides.
The apparent viscosity of table 1, a kind of Solid Free high density well control fluids
From as above experiment test result it may be seen that a kind of Solid Free high density well control fluids apparent viscosity of the embodiment of the present application offer is low, show that it has good pump-conveying property.
Two, the anti-clayswelling performance evaluation of a kind of Solid Free high density well control fluids
The anti-clayswelling performance of a kind of Solid Free high density well control fluids that experimental test example 1��3 provides.
The anti-clayswelling performance of table 2, a kind of Solid Free high density well control fluids
From as above experiment test result it may be seen that a kind of Solid Free equal > 85% of high density well control fluids anti-clayswelling rate of the embodiment of the present application offer, show that it has good anti-clayswelling performance.
Three, the high temperature corrosion inhibition of a kind of Solid Free high density well control fluids system
The high temperature corrosion inhibition of a kind of Solid Free high density well control fluids system that experimental test example 1��3 provides, temperature is 150 DEG C.
The high temperature corrosion inhibition of table 3, a kind of Solid Free high density well control fluids system
From as above experiment test result it may be seen that the equal < 0.076mm/a of high temperature rust inhibition rate of a kind of Solid Free high density well control fluids of the embodiment of the present application offer, show that it has good high temperature resistant corrosion inhibition.
Four, a kind of Solid Free high density well control fluids system core permeability restorability is evaluated
The core permeability restorability of a kind of Solid Free high density well control fluids system that experimental test example 1��3 provides.
The recovery of core permeability of table 4, a kind of Solid Free high density well control fluids system
As can be seen from as above experiment test result, the core permeability injury rate < 15% of a kind of Solid Free high density well control fluids that the embodiment of the present application provides, the equal > 85% of resume permeability rate, shows that it has good recovery of core permeability.
Above-mentioned one or more technical scheme in the embodiment of the present application, at least has following technique effect:
A kind of Solid Free high density well control fluids that the embodiment of the present application provides has: Solid Free exists, system viscosity is low, resistance to corrosion is strong, bio-toxicity is little, reservoir compatibleness is good, the advantages such as extemporaneous preparation simple and fast, solve conventional well control fluid reservoir compatibleness in prior art poor, poor heat stability, the technical problem causing to injure for two times to nearly well reservoir is there is to there is crystallization caking and solid phase during well killing fluid density two adjustment, be conducive to protection oil and gas reservoir, avoid stratum outside fluid to the two of reservoir injuries, can effectively ensure oil gas well Oil testing simultaneously, smooth enforcement kill operation in well workover process.
Although having described the preferred embodiments of the present invention, but those skilled in the art once the substantially creative concept of cicada, then these embodiments can be made other change and amendment. Therefore, it is intended that the appended claims shall be construed comprise preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, the present invention can be carried out various change and modification and not depart from the spirit and scope of the present invention by the technician of this area. 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 also is intended to comprise these change and modification.
Claims (8)
1. a Solid Free high density well control fluids, it is characterised in that, comprising:
Oxygen scavenger, inhibiter, composite salt weighting agent, crystallization inhibitor, Waterproof lock agent and water;
Wherein, in described Solid Free high density well control fluids, the mass percent of each component is: described oxygen scavenger 0.1��0.5%, described inhibiter 0.5��3.0%, described composite salt weighting agent 40��70%, described crystallization inhibitor 5��15%, described Waterproof lock agent 0.1��1.5%, all the other are water;Described Waterproof lock agent is composited by perfluoro capryl carboxylic acid Soxylat A 25-7, alkylphenol polyoxyethylene and methyl alcohol or ethanol.
2. Solid Free high density well control fluids as claimed in claim 1, it is characterized in that, in described Solid Free high density well control fluids, the mass percent of each component is: described oxygen scavenger 0.1��0.2%, described inhibiter 0.5��3.0%, described composite salt weighting agent 40��50%, described crystallization inhibitor 5��8%, described Waterproof lock agent 0.1��0.5%, all the other are water.
3. Solid Free high density well control fluids as claimed in claim 1, it is characterized in that, in described Solid Free high density well control fluids, the mass percent of each component is: described oxygen scavenger 0.2��0.3%, described inhibiter 0.5��3.0%, described composite salt weighting agent 50��60%, described crystallization inhibitor 8��10%, described Waterproof lock agent 0.5��1.0%, all the other are water.
4. Solid Free high density well control fluids as claimed in claim 1, it is characterized in that, in described Solid Free high density well control fluids, the mass percent of each component is: described oxygen scavenger 0.3��0.5%, described inhibiter 0.5��3.0%, described composite salt weighting agent 60��70%, described crystallization inhibitor 10��15%, described Waterproof lock agent 1.0��1.5%, all the other are water.
5. the Solid Free high density well control fluids as described in as arbitrary in Claims 1 to 4, it is characterised in that, described composite salt weighting agent is specially: the mixture of potassium formiate, formic acid caesium.
6. the Solid Free high density well control fluids as described in as arbitrary in Claims 1 to 4, it is characterised in that, described crystallization is kept: aminopolycanboxylic acid's salt.
7. the Solid Free high density well control fluids as described in as arbitrary in Claims 1 to 4, it is characterised in that, described oxygen scavenger is specially: the compound of Sulfothiorine and thiocarbamide, and compound proportion is 1:3.
8. the Solid Free high density well control fluids as described in as arbitrary in Claims 1 to 4, it is characterized in that, described inhibiter is specially: the mixture of Mannich base and chlorination 2-alkyl-1-tetrahydroglyoxaline-1-hexadecyldimethyl benzyl ammonium soap, or, the mixture of Mannich base and N-polyoxyethylene-2-amine ethyl-tetrahydroglyoxaline-1-hexadecyldimethyl benzyl ammonium soap.
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| CN201510900965.0A CN105647491A (en) | 2015-12-08 | 2015-12-08 | Solid-phase-free high density well killing fluid |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106928944A (en) * | 2017-02-16 | 2017-07-07 | 中国石油集团渤海钻探工程有限公司 | Waste water from dyestuff is used for the purposes and process of non-fixed phase well control fluid |
| CN107642357A (en) * | 2017-09-15 | 2018-01-30 | 西南石油大学 | A kind of temperature resistance type low corrosion high density Solid Free test fluid and preparation method thereof |
| 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 |
| CN113698920A (en) * | 2020-05-21 | 2021-11-26 | 中国石油天然气股份有限公司 | Solid-free workover fluid and preparation method and application thereof |
| CN114836191A (en) * | 2022-04-12 | 2022-08-02 | 中海石油(中国)有限公司 | Low-corrosion solid-free high-density completion fluid and preparation method thereof |
-
2015
- 2015-12-08 CN CN201510900965.0A patent/CN105647491A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106928944A (en) * | 2017-02-16 | 2017-07-07 | 中国石油集团渤海钻探工程有限公司 | Waste water from dyestuff is used for the purposes and process of non-fixed phase well control fluid |
| CN107642357A (en) * | 2017-09-15 | 2018-01-30 | 西南石油大学 | A kind of temperature resistance type low corrosion high density Solid Free test fluid and preparation method thereof |
| 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 |
| CN113698920A (en) * | 2020-05-21 | 2021-11-26 | 中国石油天然气股份有限公司 | Solid-free workover fluid and preparation method and application thereof |
| CN114836191A (en) * | 2022-04-12 | 2022-08-02 | 中海石油(中国)有限公司 | Low-corrosion solid-free high-density completion fluid and preparation method thereof |
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