CN103555304B - A kind of oil base flushing spacer fluid and preparation method thereof - Google Patents
A kind of oil base flushing spacer fluid and preparation method thereof Download PDFInfo
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- CN103555304B CN103555304B CN201310557399.9A CN201310557399A CN103555304B CN 103555304 B CN103555304 B CN 103555304B CN 201310557399 A CN201310557399 A CN 201310557399A CN 103555304 B CN103555304 B CN 103555304B
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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
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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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Abstract
The present invention relates to a kind of efficiently oil base flushing spacer fluid, this flushing spacer fluid is formulated by weight by following component: 100 parts of clear water, 1.0��1.5 parts of surfactants, 4.0��5.0 parts of chelating agen, 2.0��4.0 portions of suspension stabilizers, 0.6��0.8 part of viscosifier, 0.5��0.75 part puies forward viscous extracting and cutting agent, 25��150 parts of heavy weight additives, 1.0��5.0 parts of pH value regulator, 0.2��0.4 part of defoamer. The present invention provides a kind of high-efficiency rinsing insulating liquid being specifically designed to oil base drilling fluid, has flushing and isolation dual-use function, and its flush efficiency is high, and Auto-regulating System of Density of Heavy Medium scope is wide, and suspension stability is good, it is possible to be effectively improved interface agglutination condition, improves cementing quality.
Description
Technical field:
The present invention relates to oil drilling engineering cementing technology, belong to a kind of efficiently oil base flushing spacer fluid and preparation method thereof of Cementing technical field.
Background technology:
For a bite well (particularly development well), the quality of cementing quality, directly influence this well and can continue to creep into, can successfully produce, directly affect the life-span of oil well and the recovery ratio of oil-gas reservoir.
In well cementing operation, replacing the efficiency of drilling fluid in order to improve cement mortar, improve the bonding quality of cement sheath, be everlasting between drilling fluid and cement mortar and inject a kind of liquid, this liquid is called prepad fluid. Prepad fluid can be divided into flushing liquor and insulating liquid by its character. Flushing liquor is generally in water and adds surfactant or form by drilling fluid dilution mixture, and its effect is: (1) dilution and dispersed drilling fluid, it is prevented that the flocculation of drilling fluid or cement mortar and gelling; (2) effectively wash away the loose mud cake on the borehole wall and sleeve pipe, improve the cementing strength of cement sheath the first cement plane and the second cement plane; (3) rheological characteristic of drilling fluid and cement mortar is improved, in order to the flocculation realizing cement mortar replaces. Insulating liquid is all adjustable viscous fluid of viscosity, density and gel strength, is mainly used for isolating and plug flow displacement drilling fluid, is usually used in plug flow displacement cementing design. The Main Function of insulating liquid is: (1) isolates drilling fluid and cement mortar in cementing job, cleans well, changes the wettability of sleeve surface, makes it easy to cementing with cement mortar, do not affect the rheological characteristic that maybe can improve cement mortar and drilling fluid; (2) strictly control at low pressure well section and lost-circulation zone and requirement the well of dehydration can use as buffer; (3) pollution of cement mortar and the flocculation multiviscosisty of drilling fluid are prevented. In actual production operation, namely flushing liquor and insulating liquid can be used alone and also can use simultaneously.
At present, there is some drawbacks and deficiency in the design research and development of the flushing spacer fluid of China, design studies has hysteresis quality, and the effect of field application of the flushing spacer fluid developed is unable to reach standard-required. The most of oil field of China adopts the water-base mud washing fluid based on clear water for a long time, water-base mud is had good developing result by them, but when using oil base drilling fluid drilling well, oil base mud cake can be produced at the borehole wall and casing wall, the generation of this mud cake can make between the borehole wall and casing wall and cement mortar not cementing, conventional water base flushing liquor cannot be rinsed well at all, eventually results in cement sheath interface agglutination poor-performing. It addition, cementing operation is gone back ubiquity temperature height, sealing segment length, the problems such as hole diameter is irregular, and mud and cement mortar easily pollute mutually, and flush efficiency is low, and isolation effect is poor, and displacement efficiency is low, seriously restrict the raising of cementing quality.
Summary of the invention:
It is an object of the invention to provide a kind of flushing spacer fluid for oil base drilling fluid and preparation method thereof, to solve the problems such as fluid boundary contact stain in well cementing operation, interface agglutination be of poor quality.
Technical scheme: the present invention implements by the following technical programs:
A kind of efficiently oil base flushing spacer fluid, it is characterized in that: described flushing spacer fluid is specially adapted in well cementation the oil base drilling fluid used, and this flushing spacer fluid is made up of by weight following components: 100 parts of clear water: 1.0��1.5 parts of surfactants: 4.0��5.0 parts of chelating agen: 2.0��4.0 portions of suspension stabilizers: 0.6��0.8 part of viscosifier: 0.5��0.75 part puies forward viscous extracting and cutting agent: 25��150 parts of heavy weight additives: 1.0��5.0 parts of pH value regulator: 0.2��0.4 part of defoamer.
Described surfactant is by dodecyl polyoxyethylene (3) alcohol ether, dodecyl polyoxyethylene (9) alcohol ether, sorbitan monooleate polyxyethylated alcohol and sodium lauryl sulphate is composite forms, and is by weight: dodecyl polyoxyethylene (3) alcohol ether: dodecyl polyoxyethylene (9) alcohol ether: sorbitan monooleate polyxyethylated alcohol: sodium lauryl sulphate=1:2:3:3. Containing three oxyethylene groups in the molecular formula of dodecyl polyoxyethylene (3) alcohol ether, containing nine oxyethylene groups in the molecular formula of dodecyl polyoxyethylene (9) alcohol ether.
Described chelating agen is disodiumedetate; Described suspension stabilizer is the one in sodium bentonite, meerschaum or attapulgite; Described viscosifier are the one in hydroxyethyl cellulose, sodium carboxymethyl cellulose or modified starch; It is described that to put forward viscous extracting and cutting agent be sodium carbonate or calcium carbonate; Described heavy weight additive is the one in blanc fixe, ground calcium carbonate or ilmenite powder; Described pH value regulator is sodium hydroxide or potassium hydroxide; Described defoamer is organic silicon defoamer.
A kind of preparation method of efficient oil base flushing spacer fluid as mentioned above, it is characterized in that: by weight 100 parts of clear water are equally divided into two parts, a copy of it clear water adds 2.0��4.0 portions of suspension stabilizers, stirring 30min, room temperature places 24h, sequentially adds 0.5��0.75 part and puies forward viscous extracting and cutting agent, 4.0��5.0 parts of chelating agen, 1.0��1.5 parts of surfactants, stir; Another part of clear water adds 0.6��0.8 part of viscosifier, stirring 30min, two parts of solution are mixed and stirred for uniformly, add 25��150 parts of heavy weight additives to the density required, it is subsequently adding 1.0��5.0 parts of pH value regulator, the pH value making flushing spacer fluid is 8��11, stirs 1 hour, adds 0.2��0.4 part of defoamer finally according to practical situation.
The present invention, compared with other flushing spacer fluids existing, has the advantage that and 1. flushing liquor and insulating liquid is united two into one, and has flushing and isolation dual-use function. 2. oil-base mud and oil base mud cake being had good rinse capability and developing result, flush efficiency is up to 100%. 3. density is at 1.10g/cm3��1.80g/cm3Scalable in scope, can guarantee that high-pressure well, deep & ultra-deep well bottom pressure balance. 4. suspension stability is good, all can keep good suspension stability under room temperature and hot conditions. 5. rheological property flexible modulation. During on-the-spot application, it is rinsed rheological parameter appropriate design and the cementing operation parameter designing of insulating liquid turbulent flow or plug flow by construction requirement, it is possible to decrease the design difficulty of cement mortar, improves displacement efficiency.
Detailed description of the invention:
The present invention is compared with current achievement in research, can better remove oil-base mud and oil base mud cake, there is flushing and isolation dual-use function, the affinity of second interface can be improved, there is the wide in range density scope of application simultaneously, suspension stability is good, and preparation is simple, has wide applicability.
The present invention is described further below:
A kind of efficiently oil base flushing spacer fluid, it is characterized in that: described flushing spacer fluid is specially adapted in well cementation the oil base drilling fluid used, and this flushing spacer fluid is made up of by weight following components: 100 parts of clear water: 1.0��1.5 parts of surfactants: 4.0��5.0 parts of chelating agen: 2.0��4.0 portions of suspension stabilizers: 0.6��0.8 part of viscosifier: 0.5��0.75 part puies forward viscous extracting and cutting agent: 25��150 parts of heavy weight additives: 1.0��5.0 parts of pH value regulator: 0.2��0.4 part of defoamer.
Described surfactant is by dodecyl polyoxyethylene (3) alcohol ether (AEO3), dodecyl polyoxyethylene (9) alcohol ether (AEO9), sorbitan monooleate polyxyethylated alcohol (Tween80) and sodium lauryl sulphate (SDS) is composite forms, and is by weight: AEO3:AEO9:Tween80:SDS=1:2:3:3. Containing three oxyethylene groups in the molecular formula of dodecyl polyoxyethylene (3) alcohol ether, containing nine oxyethylene groups in the molecular formula of dodecyl polyoxyethylene (9) alcohol ether.
Described chelating agen is disodiumedetate; Described suspension stabilizer is the one in sodium bentonite, meerschaum or attapulgite; Described viscosifier are the one in hydroxyethyl cellulose, sodium carboxymethyl cellulose or modified starch; It is described that to put forward viscous extracting and cutting agent be sodium carbonate or calcium carbonate; Described heavy weight additive is the one in blanc fixe, ground calcium carbonate or ilmenite powder; Described pH value regulator is sodium hydroxide or potassium hydroxide; Described defoamer is organic silicon defoamer.
This flushing spacer fluid uses the compound system of nonionic surfactant and anion surfactant, wherein nonionic surfactant good stability, acid and alkali, alkali, salt affect, stability in hard water is good, and there is good emulsifying and dirt-removing power, good with other surfactant compatibility, add a small amount of anion surfactant and can improve its cloud point, expand use scope. AEO3 is a kind of lipophilic emulsifier, greasy dirt is had good emulsifying and scourability, AEO9 is the emulsifying agent of good O/W type, there is low foaming and polymolecularity, Tween80 has stronger hydrophilic, being typically used as wetting agent, emulsifying agent, penetrating agent, SDS is soluble in water, has good emulsifying, decontamination, infiltration, dispersibility. The existing lipophile of this compound system has again hydrophilic, it is possible to effectively remove oil-base mud, improves interface agglutination quality.
The preparation method of this flushing spacer fluid is: 100 parts of clear water are equally divided into two parts, a copy of it clear water adds 2.0��4.0 parts (by clear water total, lower same) suspension stabilizer, stirring 30min, room temperature places 24h, sequentially adds 0.5��0.75 part and puies forward viscous extracting and cutting agent, 4.0��5.0 parts of chelating agen, 1.0��1.5 parts of surfactants, stir. Another part of clear water adds 0.6��0.8 part of viscosifier, stirring 30min, two parts of solution are mixed and stirred for uniformly, add 25��150 parts of heavy weight additives to the density required, being subsequently adding 1.0��5.0 parts of pH value regulator makes the pH value of flushing spacer fluid be 8��11, stir 1 hour, add 0.2��0.4 part of defoamer finally according to practical situation.
In the preparation method of this flushing spacer fluid, 100 parts of clear water are divided into two parts and are to ensure that suspending agent and viscosifier are uniformly dispersed in the solution. Suspending agent and viscosifier are respectively formed thick solution after being dissolved in water, be unfavorable for forming stable homogeneous solution with in a clear water if successively adding.
Making 8 kinds of flushing spacer fluids as stated above, component proportion sees attached list 1.
The suspension stability of 8 kinds of flushing spacer fluids is tested, and result sees attached list 2. Test result indicate that flushing spacer fluid Auto-regulating System of Density of Heavy Medium wide ranges, freely adjustable from 1.12��1.80, under room temperature and heating condition, after standing, levels density contrast is respectively less than or equal to 0.02g/cm3, there is well suspended stability.
The rheological characteristic of 8 kinds of flushing spacer fluids is tested, and result sees attached list 3 and 4.Being drawn by data in table, the rheological parameter n of flushing spacer fluid is between 0.6��0.8, and K, less than 1.0, has good rheological characteristic.
Embodiment 1, (density is 1.12g/cm to make 1# according to each component proportion in the preparation method of above-mentioned flushing spacer fluid and subordinate list 13) flushing spacer fluid. According to standard SY/T5374-2000 Oil/gas Well cementing prepad fluid using method, the developing result of flushing spacer fluid liquid is tested. The instrument used in experiment is six speed rotating cylinder viscometers, and setting speed is 200 turns, and the oil base drilling fluid of use is self-control. Washing time is 5min, flush efficiency 100%.
Embodiment 2, (density is 1.40g/cm to make 4# according to each component proportion in the preparation method of above-mentioned flushing spacer fluid and subordinate list 13) flushing spacer fluid. According to standard SY/T5374-2000 Oil/gas Well cementing prepad fluid using method, the developing result of flushing spacer fluid liquid is tested. The instrument used in experiment is six speed rotating cylinder viscometers, and setting speed is 200 turns, and the oil base drilling fluid of use is self-control. Washing time is 4.5min, flush efficiency 100%.
Embodiment 3, (density is 1.80g/cm to make 8# according to each component proportion in the preparation method of above-mentioned flushing spacer fluid and subordinate list 13) flushing spacer fluid. According to standard SY/T5374-2000 Oil/gas Well cementing prepad fluid using method, the developing result of flushing spacer fluid liquid is tested. The instrument used in experiment is six speed rotating cylinder viscometers, and setting speed is 200 turns, and the oil base drilling fluid of use is self-control. Washing time is 3.5min, flush efficiency 100%.
Each component proportion tables of data in subordinate list 1 flushing spacer fluid system
Note: formula as below is numbered ibid.
The flushing spacer fluid suspension stability test data table of subordinate list 2 different densities
Flushing spacer fluid rheology test tables of data (room temperature) of subordinate list 3 different densities
The flushing spacer fluid rheology test tables of data (90 DEG C) of subordinate list 4 different densities
Claims (3)
1. an oil base flushing spacer fluid, it is characterized in that: described flushing spacer fluid is specially adapted in well cementation the oil base drilling fluid used, and this flushing spacer fluid is made up of by weight following components: 100 parts of clear water: 1.0��1.5 parts of surfactants: 4.0��5.0 parts of chelating agen: 2.0��4.0 portions of suspension stabilizers: 0.6��0.8 part of viscosifier: 0.5��0.75 part puies forward viscous extracting and cutting agent: 25��150 parts of heavy weight additives: 1.0��5.0 parts of pH value regulator: 0.2��0.4 part of defoamer;
Described surfactant is by dodecyl polyoxyethylene (3) alcohol ether, dodecyl polyoxyethylene (9) alcohol ether, sorbitan monooleate polyxyethylated alcohol and sodium lauryl sulphate is composite forms, and is by weight: dodecyl polyoxyethylene (3) alcohol ether: dodecyl polyoxyethylene (9) alcohol ether: sorbitan monooleate polyxyethylated alcohol: sodium lauryl sulphate=1:2:3:3;
Described suspension stabilizer is the one in sodium bentonite, meerschaum or attapulgite; Described viscosifier are the one in hydroxyethyl cellulose, sodium carboxymethyl cellulose or modified starch; It is described that to put forward viscous extracting and cutting agent be sodium carbonate or calcium carbonate;
The preparation method of oil base flushing spacer fluid, it is characterized in that: by weight 100 parts of clear water are equally divided into two parts, a copy of it clear water adds 2.0��4.0 portions of suspension stabilizers, stirring 30min, room temperature places 24h, sequentially adds 0.5��0.75 part and puies forward viscous extracting and cutting agent, 4.0��5.0 parts of chelating agen, 1.0��1.5 parts of surfactants, stir;Another part of clear water adds 0.6��0.8 part of viscosifier, stirring 30min, two parts of solution are mixed and stirred for uniformly, add 25��150 parts of heavy weight additives to the density required, it is subsequently adding 1.0��5.0 parts of pH value regulator, the pH value making flushing spacer fluid is 8��11, stirs 1 hour, adds 0.2��0.4 part of defoamer finally according to practical situation.
2. oil base flushing spacer fluid according to claim 1, it is characterised in that: described chelating agen is disodiumedetate; Described heavy weight additive is the one in blanc fixe, ground calcium carbonate or ilmenite powder; Described pH value regulator is sodium hydroxide or potassium hydroxide; Described defoamer is organic silicon defoamer.
3. the preparation method of an oil base flushing spacer fluid as claimed in claim 1, it is characterized in that: by weight 100 parts of clear water are equally divided into two parts, a copy of it clear water adds 2.0��4.0 portions of suspension stabilizers, stirring 30min, room temperature places 24h, sequentially adds 0.5��0.75 part and puies forward viscous extracting and cutting agent, 4.0��5.0 parts of chelating agen, 1.0��1.5 parts of surfactants, stir; Another part of clear water adds 0.6��0.8 part of viscosifier, stirring 30min, two parts of solution are mixed and stirred for uniformly, add 25��150 parts of heavy weight additives to the density required, it is subsequently adding 1.0��5.0 parts of pH value regulator, the pH value making flushing spacer fluid is 8��11, stirs 1 hour, adds 0.2��0.4 part of defoamer finally according to practical situation.
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