CN108441194A - The cleaning method of the borehole wall and the Cementing used before a kind of well cementation of synthetic base drilling fluid - Google Patents
The cleaning method of the borehole wall and the Cementing used before a kind of well cementation of synthetic base drilling fluid Download PDFInfo
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- CN108441194A CN108441194A CN201810258792.0A CN201810258792A CN108441194A CN 108441194 A CN108441194 A CN 108441194A CN 201810258792 A CN201810258792 A CN 201810258792A CN 108441194 A CN108441194 A CN 108441194A
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- borehole wall
- drilling fluid
- cleaning method
- cleaning
- fluid
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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
- C09K8/40—Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses
-
- 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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
Abstract
The invention belongs to reinforcing oil well technical fields, and in particular to the cleaning method of the borehole wall and the Cementing used before a kind of well cementation of synthetic base drilling fluid.The present invention sequentially contacts drilling fluid base fluid, organic solvent, flushing liquor and insulating liquid respectively with the borehole wall, and each component synergistic effect improves the flushing effect to the drilling fluid borehole wall.Embodiment the result shows that, the cleaning method, can make the cleaning efficiency of the borehole wall reach 90% or more using the above scheme.
Description
Technical field
The invention belongs to reinforcing oil well technical fields, and in particular to a kind of cleaning side of the preceding borehole wall of synthetic base drilling fluid well cementation
Method and the Cementing used.
Background technology
During oil exploitation, the compatibility between drilling fluid and cementing slurry is poor, this is just needed in well cementation
Before replace into prepad fluid, drilling fluid is isolated, and the borehole wall is cleaned, improve cementing quality.And the cleaning difficulty of the borehole wall is outstanding
It is most, this is because oil base drilling fluid and synthetic base drilling fluid can make the borehole wall form one with oil base drilling fluid and synthetic base drilling fluid
Layer " oil film ", and due to having very strong cementation between differential pressure action, with the borehole wall, if cannot effectively be cleaned to it,
Cementing quality will certainly be influenced, and then influences oil-gas mining.
Both at home and abroad to the cleaning aspect of oil base drilling fluid or synthetic base drilling fluid mud cake, a large amount of research work is done, such as
Chinese patent CN201310545773.3 discloses a kind of shale gas exploitation oil base drilling fluid mud cake cleaning solution；Chinese patent
CN201610438760.X discloses a kind of microemulsion-type flushing liquor system suitable for oil base drilling fluid；Chinese patent
201510990331.9 disclose a kind of well cementation flushing liquor system suitable for oil base drilling fluid, mainly solve existing oil base drilling well
The big problem of liquid mud cake cleaning difficulty, but above-mentioned well cementation flushing liquor system pairing is paid no attention at the mud cake flushing effect of base drilling fluid
Think, influences the cementing of hydrogel and the borehole wall of subsequently cementing the well.
Invention content
The cleaning method of the borehole wall before cementing the well the purpose of the present invention is to provide a kind of synthetic base drilling fluid.It is provided by the invention
Cleaning method can effectively clean the mud cake of synthetic base drilling fluid, realize the isolation to cement mortar, be effectively improved well cementation water
The bonding quality of mud and the borehole wall improves cementing quality.
In order to achieve the above object, the present invention provides the following technical solutions：
The cleaning method of the borehole wall, includes the following steps before cementing the well the present invention provides a kind of synthetic base drilling fluid：
(1) drilling fluid base fluid is injected into oil drilling, previous cleaning is carried out to the borehole wall；During the previous cleaning, drilling well
Liquid-based liquid contacts under turbulent condition with the borehole wall, and the time of the contact is 2~7min；
(2) after step (1) previous cleaning, the second cleaning is carried out to the borehole wall using organic solvent；The mistake of second cleaning
Cheng Zhong, organic solvent contact under turbulent condition with the borehole wall, and the time of the contact is 5~8min；
(3) after the step (2) second is cleaned, the borehole wall is rinsed using flushing liquor；During the flushing, punching
Washing lotion contacts under turbulent condition with the borehole wall, and the time of the contact is 5~10min；
(4) after the step (3) is rinsed, the borehole wall is isolated using insulating liquid；During the isolation, insulating liquid
It is contacted with the borehole wall, the time of the contact is 2~5min.
Preferably, the organic solvent includes perfluoro-n-octane or hexamethylene.
Preferably, in terms of mass parts, the flushing liquor includes 100 parts of water and 20~100 parts of irrigations.
Preferably, in terms of mass parts, the insulating liquid includes 100 parts of water, 2~5 portions of interleaving agents and 10~50 parts of isolation punchings
Lotion.
Preferably, the irrigation and isolation irrigation include independently perfluoro capryl ammonium chloride iodide and nonionic table
Face activating agent.
Preferably, the flushing liquor further includes rinsing heavy weight additive；The insulating liquid further includes isolation heavy weight additive；The flushing
Heavy weight additive and isolation heavy weight additive include independently barite and/or Iron Ore Powder.
Preferably, the interleaving agent includes tackifier, crosslinking agent, fluid loss additive and pH value alkaline conditioner；The thickening
Agent, crosslinking agent, fluid loss additive and pH value alkaline conditioner mass ratio be (20~30):(4~6):(50~70):(8~12).
Preferably, the tackifier include one or more in xanthans, guar gum, fenugreek gum and carragheen；
The crosslinking agent includes sodium tetraborate；
The fluid loss additive includes cationic starch；
The pH value alkaline conditioner includes sodium hydroxide and sodium carbonate.
Preferably, the cationic starch includes hydroxypropul starch and/or carboxymethyl starch.
The present invention also provides the prepad fluids for cleaning method described in above-mentioned technical proposal, including the drilling well independently dispensed
Liquid-based liquid, organic solvent, flushing liquor and insulating liquid.
The cleaning method of the borehole wall, includes the following steps before cementing the well the present invention provides a kind of synthetic base drilling fluid：It adopts first
Previous cleaning is carried out to the borehole wall with drilling fluid base fluid；During the previous cleaning, drilling fluid base fluid contacts under turbulent condition with the borehole wall,
The time of the contact is 2~7min；After previous cleaning, the present invention carries out the second cleaning using organic solvent to the borehole wall；Described second
During cleaning, organic solvent contacts under turbulent condition with the borehole wall, and the time of the contact is 5~8min；Second cleaning
Afterwards, then the borehole wall is rinsed using flushing liquor；During the flushing, flushing liquor connects under turbulent condition with the borehole wall
It touches, the time of the contact is 5~10min；It completes after rinsing, the borehole wall is isolated using insulating liquid；The mistake of the isolation
Cheng Zhong, the time that insulating liquid is contacted with the borehole wall are 2~5min.
The present invention sequentially contacts drilling fluid base fluid, organic solvent, flushing liquor and insulating liquid with the borehole wall, and each component collaboration is made
With flushing effect of the raising to the drilling fluid borehole wall.Synthetic drilling fluid is easy that the borehole wall is made to form one layer " oil film ", and since pressure difference is made
With with very strong cementation between the borehole wall, it is difficult to clean.The present invention utilizes the mud cake that drilling fluid base fluid adheres to the borehole wall
It is washed away, softens mud cake, reduced the bond between mud cake and the borehole wall, be conducive to the infiltration of organic solvent；Organic solvent oozes
Mud cake deep is arrived thoroughly, enters between mud cake and the borehole wall, mud cake is removed, destroy the structure of mud cake, further decrease mud
The bond of cake and the borehole wall；It rinses remaining mud cake after liquid energy rinses organic solvent to be washed away and cleaned, and emulsifies bonding
Synthetic base drilling fluid on the borehole wall further increases the removal rate to drilling fluid, and realizes the borehole wall and casing wettability reversal, makes
The borehole wall and casing of oil drilling are changed into water wetting；Flushing liquor and cement mortar finally are separated using insulating liquid, prevents cement mortar
It is mutually altered with flushing liquor and flushing effect is caused to be deteriorated, and further enhance the wettability reversal effect of the borehole wall, improve cementing matter of cementing the well
Amount.Embodiment the result shows that, the cleaning method using the above scheme reaches 90% or more, cleaning to the cleaning efficiency of the borehole wall
Effect is ideal, so that cementing quality is met the requirements, and improve the cementing strength of cementing slurry and the borehole wall, has further reached anti-
The purpose only altered on oil gas.
Specific implementation mode
The cleaning method of the borehole wall, includes the following steps before cementing the well the present invention provides a kind of synthetic base drilling fluid：
(1) drilling fluid base fluid is used to carry out previous cleaning to the borehole wall；During the previous cleaning, drilling fluid base fluid is in turbulent condition
Lower to be contacted with the borehole wall, the time of the contact is 3~5min；
(2) after step (1) previous cleaning, the second cleaning is carried out to the borehole wall using organic solvent；The mistake of second cleaning
Cheng Zhong, organic solvent contact under turbulent condition with the borehole wall, and the time of the contact is 5~8min；
(3) after the step (2) second is cleaned, the borehole wall is rinsed using flushing liquor；During the flushing, punching
Washing lotion contacts under turbulent condition with the borehole wall, and the time of the contact is 5~10min；
(4) after the step (3) is rinsed, the borehole wall is isolated using insulating liquid；During the isolation, insulating liquid
The time contacted with the borehole wall is 2~5min.
In the present invention, unless otherwise specified, the component involved in the cleaning method is that those skilled in the art are ripe
The commercial product known.
The present invention carries out previous cleaning using drilling fluid base fluid to the borehole wall.In the present invention, the previous cleaning is i.e. by the drilling fluid
Base fluid is injected into oil drilling, is cleaned to the borehole wall.The present invention is not special to the injection mode of the drilling fluid base fluid
It is required that using well known to those skilled in the art.The present invention does not have particular/special requirement to the drilling fluid base fluid, using ability
Known to field technique personnel.In the present invention, the drilling fluid base fluid preferably includes synthetic base drilling fluid base fluid.In this hair
In bright, the drilling fluid base fluid includes but not limited to makings oil or direct-connected alkane.
In the present invention, when carrying out previous cleaning to the borehole wall using drilling fluid base fluid, the drilling fluid base fluid is under turbulent condition
It is contacted with the borehole wall, the time of the contact is 2~7min, further preferably 3~5min.Turbulent condition of the present invention refers to
Particle makees irregular movement, mutual blending, the tortuous chaotic flow regime in track in liquid.In the present invention, the drilling fluid
The turbulent condition of base fluid is preferably realized by adjusting annular space and returning the rheological parameter of speed and drilling fluid base fluid.The present invention is to the tune
The mode of section does not have particular/special requirement, using well known to those skilled in the art.In the present invention, the drilling fluid base fluid
Rheological parameter preferably indicates that the apparent viscosity of the drilling fluid base fluid is preferably≤10mPas, further excellent with apparent viscosity
It is selected as 1~5mPas.
Fluidised form and time when the present invention contacts the drilling fluid base fluid and the borehole wall carry out above-mentioned restriction, make drilling well liquid-based
Liquid effectively washes away the mud cake that the borehole wall adheres to and is softened, and the bond between mud cake and the borehole wall is reduced, and is follow-up organic
The infiltration of solvent provides condition.
After the previous cleaning, the present invention carries out the second cleaning using organic solvent to the borehole wall.In the present invention, described second is clear
It washes and the organic solvent is injected into oil drilling, the borehole wall is cleaned.Injection of the present invention to the organic solvent
Mode does not have particular/special requirement, using well known to those skilled in the art.In the present invention, the organic solvent preferably includes
Perfluoro-n-octane or hexamethylene.In the present invention, the rheological parameter of the organic solvent is preferably indicated with apparent viscosity, described to have
The apparent viscosity of solvent is preferably≤12mPas, further preferably 2~8mPas.
In the present invention, when carrying out the second cleaning to the borehole wall using organic solvent, the organic solvent is under turbulent condition
It is contacted with the borehole wall, the time of the contact is 5~8min, further preferably 4.5~7.5min.In the present invention, described to have
The turbulent condition realization method of solvent is consistent with the realization method of drilling fluid base fluid, and details are not described herein.
The fluidised form and time that the present invention contacts organic solvent in second cleaning process with the borehole wall carry out above-mentioned restriction,
So that organic solvent is penetrated into mud cake deep, especially penetrate between mud cake and the borehole wall, mud cake is removed, destroys mud cake
Structure further decreases bond.
After second cleaning, the present invention is rinsed the borehole wall using flushing liquor.In the present invention, the flushing will
The flushing liquor is injected into oil drilling, is rinsed to the borehole wall.The present invention is to the injection mode of the flushing liquor without spy
It is different to require, using well known to those skilled in the art.
In the present invention, in terms of mass parts, the flushing liquor preferably includes 100 parts of water and 20~100 parts of irrigations.
On the basis of the mass parts of water in the flushing liquor, irrigation of the present invention is more preferably 30~90 parts,
More preferably 35~85 parts.In the present invention, the irrigation preferably includes perfluoro capryl ammonium chloride iodide and nonionic table
The mass ratio of face activating agent, the perfluoro capryl ammonium chloride iodide and nonionic surfactant is preferably 5:90~100, into
One step is preferably 5:92~97, more preferably 5:95.In the present invention, the nonionic surfactant preferably includes isomery ten
Triol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, polyoxyethylene carboxylate and propylene glycol propyl ether.In the present invention, described
Isomerous tridecanol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, the mass ratio of polyoxyethylene carboxylate and propylene glycol propyl ether are excellent
It is selected as 5:22~27:22~27:35~45；Further preferably 5:23~26:23~5:37~42, more preferably 5:25:25:
40。
On the basis of the mass parts of water in the flushing liquor, flushing liquor of the present invention preferably further includes 0~100 part of flushing
Heavy weight additive.In the present invention, the flushing heavy weight additive preferably includes barite and/or Iron Ore Powder, further preferably barite
Or Iron Ore Powder.In the present invention, when the flushing heavy weight additive is mixture, quality of the present invention to each component in the mixture
Than being not particularly limited.
In the present invention, the rheological parameter of the flushing liquor is preferably indicated with apparent viscosity, and the apparent of the flushing liquor sticks
Degree is preferably≤20mPas, further preferably 5~15mPas.
In flushing process, flushing liquor of the present invention contacts under turbulent condition with the borehole wall, and time of the contact is 5~
10min, further preferably 5.5~9.5min.In the present invention, the turbulent condition realization method and drilling fluid of the flushing liquor
The realization method of base fluid is consistent, and details are not described herein.
The fluidised form and time that the present invention contacts the flushing liquor with the borehole wall carry out above-mentioned restriction, make flushing liquor to organic molten
Remaining mud cake is washed away and is cleaned after agent is rinsed, and emulsifies remaining drilling fluid base fluid, and drilling fluid base fluid is made to enter punching
In washing lotion, wettability reversal is realized to the borehole wall and casing, the borehole wall is made to be changed into water wetting.
After the flushing, the present invention is isolated the borehole wall using insulating liquid.In the present invention, the isolation i.e. will be described
Insulating liquid is injected into oil drilling, and the borehole wall is isolated.The present invention does not have special want to the injection mode of the insulating liquid
It asks, using well known to those skilled in the art.
In the present invention, in terms of mass parts, the insulating liquid preferably includes 100 parts of water, 2~5 portions of interleaving agents and 10~50
Part isolation irrigation.
On the basis of the mass parts of water in the insulating liquid, interleaving agent of the present invention is preferably 2.5~4.5 parts, into one
Preferably 3~4 parts of step.In the present invention, the interleaving agent preferably includes tackifier, crosslinking agent, fluid loss additive and pH value alkalinity
Conditioning agent, the tackifier, crosslinking agent, fluid loss additive and pH value alkaline conditioner mass ratio be preferably (20~30):(4~
6):(50~70):(8~12), further preferably (24~26):5:(55~65):(9~11).
In the present invention, the tackifier preferably include one kind or more in xanthans, guar gum, fenugreek gum and carragheen
Kind, further preferably xanthans, guar gum, fenugreek gum or carragheen.In the present invention, the tackifier are the mixed of various ingredients
When closing object, the present invention does not have particular/special requirement to the mass ratio of each component in the mixture.
In the present invention, the crosslinking agent preferably includes sodium tetraborate.
In the present invention, the fluid loss additive preferably includes cationic starch, further preferably hydroxypropul starch and/or
Carboxymethyl starch.In the present invention, when the fluid loss additive is the mixture of various ingredients, the present invention is to each in the mixture
The mass ratio of component does not have particular/special requirement.
In the present invention, the pH value alkaline conditioner preferably includes sodium hydroxide and/or sodium carbonate, further preferably
Sodium hydroxide and sodium carbonate.In the present invention, when the pH value alkaline conditioner is the mixture of sodium hydroxide and sodium carbonate, institute
It is preferably 20 to state the mass ratio of sodium hydroxide and sodium carbonate in mixture:70~90, further preferably 20:75~85, it is more excellent
It is selected as 20:80.
In the present invention, the interleaving agent is preferably included tackifier, crosslinking agent, fluid loss additive and pH value alkaline conditioner
It is mixed to get.The present invention does not have particular/special requirement to the mode of the mixing, using well known to those skilled in the art.
On the basis of the mass parts of water in the insulating liquid, isolation irrigation of the present invention is preferably 10~50 parts, into
One step is preferably 20~40 parts.In the present invention, the isolation irrigation preferably includes perfluoro capryl ammonium chloride iodide and non-
The mass ratio of ionic surface active agent, the perfluoro capryl ammonium chloride iodide and nonionic surfactant is preferably 5：90~
100, further preferably 5:92~97, more preferably 5:95.In the present invention, the nonionic surfactant preferably includes
Isomerous tridecanol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, polyoxyethylene carboxylate and propylene glycol propyl ether；The isomery ten
Triol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, polyoxyethylene carboxylate and propylene glycol propyl ether mass ratio be preferably 5:
22~27:22~27:35~45；Further preferably 5:23~26:23~5:37~42, more preferably 5:25:25:40.
In the present invention, the isolation irrigation preferably includes to live in perfluoro capryl ammonium chloride iodide and non-ionic surface
Property agent is mixed to get.The present invention does not have particular/special requirement to the mode of the mixing, using well known to those skilled in the art.
On the basis of the mass parts of water in the insulating liquid, insulating liquid of the present invention preferably further includes 0~100 part of isolation
Heavy weight additive.In the present invention, the isolation heavy weight additive preferably includes barite and/or Iron Ore Powder, further preferably barite
Or Iron Ore Powder.In the present invention, when the isolation heavy weight additive is mixture, quality of the present invention to each component in the mixture
Than being not particularly limited.
In the present invention, the rheological parameter of the insulating liquid is preferably indicated with apparent viscosity, and the apparent of the insulating liquid sticks
Degree is preferably >=40mPas, further preferably 50~80mPas.
Insulating liquid of the present invention preferably includes said components being mixed to get.The present invention does not have the mode of the mixing
Particular/special requirement, using well known to those skilled in the art.
In isolation processes, insulating liquid of the present invention is contacted with the borehole wall, and the time of the contact is 2~5min, further
Preferably 2.5~4.5min.
The time when present invention contacts the insulating liquid and the borehole wall carries out above-mentioned restriction, and isolation liquid energy is made to separate flushing liquor
And cement mortar, prevent cement mortar from mutually being altered with flushing liquor and flushing effect is caused to be deteriorated, and further enhance the profit realized to the borehole wall
Wet inversion effect, and then achieve the purpose that improve cementing quality.
The present invention also provides the Cementings that cleaning method described in above-mentioned technical proposal uses, including independently dispense
Drilling fluid base fluid, organic solvent, flushing liquor and insulating liquid.In the present invention, the drilling fluid base fluid, organic solvent, flushing liquor
With drilling fluid base fluid, organic solvent, flushing liquor and insulating liquid one are used in cleaning method described in insulating liquid and above-mentioned technical proposal
It causes, details are not described herein.
In order to further illustrate the present invention, with reference to embodiment to a kind of synthetic base drilling fluid well cementation provided by the invention
The cleaning method of the preceding borehole wall and its Cementing used are described in detail, but they cannot be interpreted as to the present invention
The restriction of protection domain.
Embodiment 1：
Unless otherwise specified, the dosage of component as described below refers both to mass parts.
Drilling fluid base fluid is synthetic-based mud used by synthetic base drilling fluid；
Organic solvent is perfluoro-n-octane；
Flushing liquor is 100 parts of water and 20 parts of irrigations；Wherein irrigation is perfluoro capryl ammonium chloride iodide, isomery 13
Alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, polyoxyethylene carboxylate and propylene glycol propyl ether are according to mass ratio 5:5:25:
25:40 compound；
Insulating liquid is 100 parts of water, 2 portions of interleaving agents and 10 parts of isolation irrigations；
Interleaving agent is tackifier, crosslinking agent, fluid loss additive and pH value alkaline conditioner according to mass ratio 25:5:60:10 is multiple
With into；Wherein tackifier are xanthans, and crosslinking agent is sodium tetraborate, and fluid loss additive is hydroxypropul starch, and pH value alkalinity is adjusted
Agent is sodium hydroxide and sodium carbonate mass ratio is 20:80 mixture.
Isolation irrigation is perfluoro capryl ammonium chloride iodide, isomerous tridecanol polyoxyethylene ether, aliphatic alcohol polyethenoxy
Ether, polyoxyethylene carboxylate and propylene glycol propyl ether are according to mass ratio 5:5:25:25:40 compound.
Cleaning method：
Synthetic-based mud, organic solvent, flushing liquor and insulating liquid are sequentially injected into and are pumped into equipment, sequentially uses synthetic-based mud
Drilling shaft lining is cleaned with organic solvent, flushing liquor is rinsed drilling shaft lining and insulating liquid is to flushing liquor and cement mortar
It is isolated, and assists cleaning drilling shaft lining：The time of contact of above-mentioned each component and the borehole wall is respectively：
Synthetic-based mud is 5min with borehole wall time of contact；
Organic solvent is 8min with borehole wall time of contact；
Flushing liquor is 10min with borehole wall time of contact；
Insulating liquid is 5min with borehole wall time of contact.
The mud cake of synthetic base drilling fluid is handled according to the method described above, can realize and be more than to the cleaning efficiency of the borehole wall
90%, the acoustic amplitude of cementing quality is less than 15%, and cementing quality is excellent.
Embodiment 2：
Cleaning reagent forms and dosage is with embodiment 1, the difference is that：
Organic solvent is hexamethylene；
Flushing liquor is 100 parts of water, 100 parts of irrigations and 100 parts of flushing heavy weight additives；
Flushing heavy weight additive is barite；
Insulating liquid is 100 parts of water, 5 portions of interleaving agents, 50 parts of isolation irrigations and 100 parts of isolation heavy weight additives；
Wherein tackifier are fenugreek gum, and fluid loss additive is hydroxypropul starch；
Isolation heavy weight additive is barite.
It is cleaned according to the cleaning method of embodiment 1, the difference is that：
Synthetic-based mud is 3min with borehole wall time of contact；
Organic solvent is 5min with borehole wall time of contact；
Flushing liquor is 5min with borehole wall time of contact；
Insulating liquid is 2min with borehole wall time of contact.
The mud cake of synthetic base drilling fluid is handled according to the method described above, can realize and be more than to the cleaning efficiency of the borehole wall
91%, the acoustic amplitude of cementing quality is less than 13%, and cementing quality is excellent.
Embodiment 3：
Cleaning reagent with embodiment 1, the difference is that：
Flushing liquor is 100 parts of water, 60 parts of irrigations and 50 parts of flushing heavy weight additives；
Flushing heavy weight additive is Iron Ore Powder.
Insulating liquid is 100 parts of water, 3 portions of interleaving agents, 30 parts of isolation irrigations and 50 parts of isolation heavy weight additives；
Wherein tackifier are guar gum, and fluid loss additive is carboxymethyl starch, and isolation heavy weight additive is Iron Ore Powder.
Cleaning method with embodiment 1, the difference is that：
Synthetic-based mud is 4min with borehole wall time of contact；
Organic solvent is 6min with borehole wall time of contact；
Flushing liquor is 8min with borehole wall time of contact；
Insulating liquid is 4min with borehole wall time of contact.
The mud cake of synthetic base drilling fluid is handled according to the method described above, can realize and be more than to the cleaning efficiency of the borehole wall
95%, the acoustic amplitude of cementing quality is less than 10%, and cementing quality is excellent.
Embodiment 4：
Cleaning reagent is formed with embodiment 1 together, the difference is that：
Organic solvent is hexamethylene；
Flushing liquor is 100 parts of water, 100 parts of irrigations and 20 parts of flushing heavy weight additives；
Flushing heavy weight additive is barite.
The insulating liquid is 100 parts of water, 5 portions of interleaving agents, 10 parts of isolation irrigations, 20 parts of isolation heavy weight additive compositions；
Wherein tackifier are carragheen, and isolation heavy weight additive is barite.
Cleaning method with embodiment 1, the difference is that：
Synthetic-based mud is 5min with borehole wall time of contact；
Organic solvent is 5min with borehole wall time of contact；
Flushing liquor is 5min with borehole wall time of contact；
Insulating liquid is 5min with borehole wall time of contact.
The mud cake of synthetic base drilling fluid is handled according to the method described above, can realize and be more than to the cleaning efficiency of the borehole wall
93%, the acoustic amplitude of cementing quality is less than 12%, and cementing quality is excellent.
Comparative example 1：
Prepad fluid group becomes the flushing liquor in the present invention separately as prepad fluid,
Flushing liquor is 100 parts of water and 20 parts of irrigations；Wherein irrigation is perfluoro capryl ammonium chloride iodide, isomery 13
Alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, polyoxyethylene carboxylate and propylene glycol propyl ether are according to mass ratio 5:5:25:
25:40 compound.
Cleaning method is to be injected into flushing liquor to be pumped into equipment, is cleaned to drilling shaft lining, scavenging period 25min.
The mud cake of synthetic base drilling fluid is handled according to the method described above, cleaning solution efficiency is only 60%, cementing quality
Acoustic amplitude is more than 30%, and cementing quality is qualification.
Comparative example 2：
Prepad fluid group becomes water as prepad fluid,
Cleaning method is to inject water into be pumped into equipment, is cleaned to drilling shaft lining, scavenging period 30min.
The mud cake of synthetic base drilling fluid is handled according to the method described above, cleaning solution efficiency is only 20%, cementing quality
Acoustic amplitude is more than 70%, and cementing quality is unqualified.
It, can be significantly by above example and comparative example it is found that Cementing using the present invention and cleaning method
Cleaning efficiency is improved, and acoustic amplitude can be controlled in relatively low range, cementing quality reaches excellent.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. the cleaning method of the borehole wall, includes the following steps before a kind of synthetic base drilling fluid well cementation：
(1) drilling fluid base fluid is used to carry out previous cleaning to the borehole wall；During the previous cleaning, drilling fluid base fluid under turbulent condition with
The borehole wall contacts, and the time of the contact is 2~7min；
(2) after step (1) previous cleaning, the second cleaning is carried out to the borehole wall using organic solvent；During second cleaning,
Organic solvent contacts under turbulent condition with the borehole wall, and the time of the contact is 5~8min；
(3) after the step (2) second is cleaned, the borehole wall is rinsed using flushing liquor；During the flushing, flushing liquor
It is contacted with the borehole wall under turbulent condition, the time of the contact is 5~10min；
(4) after the step (3) is rinsed, the borehole wall is isolated using insulating liquid；During the isolation, insulating liquid and well
The time of wall contact is 2~5min.
2. cleaning method as described in claim 1, which is characterized in that the organic solvent includes perfluoro-n-octane or hexamethylene
Alkane.
3. cleaning method as described in claim 1, which is characterized in that in terms of mass parts, the flushing liquor include 100 parts of water and
20~100 parts of irrigations.
4. cleaning method as described in claim 1, which is characterized in that in terms of mass parts, the insulating liquid includes 100 parts of water, 2
~5 portions of interleaving agents and 10~50 parts of isolation irrigations.
5. cleaning method as described in claim 3 or 4, which is characterized in that the irrigation and isolation irrigation independently wrap
Include perfluoro capryl ammonium chloride iodide and nonionic surfactant.
6. cleaning method as described in claim 3 or 4, which is characterized in that the flushing liquor further includes rinsing heavy weight additive；It is described
Insulating liquid further includes isolation heavy weight additive；
The flushing heavy weight additive and isolation heavy weight additive include independently barite and/or Iron Ore Powder.
7. cleaning method as claimed in claim 4, which is characterized in that the interleaving agent includes tackifier, crosslinking agent, filtrate reducing
Agent and pH value alkaline conditioner；The tackifier, crosslinking agent, fluid loss additive and pH value alkaline conditioner mass ratio be (20~
30):(4~6):(50~70):(8~12).
8. cleaning method as claimed in claim 7, which is characterized in that the tackifier include xanthans, guar gum, fenugreek gum and
It is one or more in carragheen；
The crosslinking agent includes sodium tetraborate；
The fluid loss additive includes cationic starch；
The pH value alkaline conditioner includes sodium hydroxide and sodium carbonate.
9. cleaning method as claimed in claim 8, which is characterized in that the cationic starch include hydroxypropul starch and/or
Carboxymethyl starch.
10. for the prepad fluid of any one of claim 1~9 cleaning method, including independently dispense drilling fluid base fluid, have
Solvent, flushing liquor and insulating liquid.
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| CN201810258792.0A CN108441194A (en) | 2018-03-27 | 2018-03-27 | The cleaning method of the borehole wall and the Cementing used before a kind of well cementation of synthetic base drilling fluid |
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| CN201810258792.0A CN108441194A (en) | 2018-03-27 | 2018-03-27 | The cleaning method of the borehole wall and the Cementing used before a kind of well cementation of synthetic base drilling fluid |
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Application publication date: 20180824 |