CN103555304A - High-efficiency oil-based flushing spacer liquid and preparation method thereof - Google Patents
High-efficiency oil-based flushing spacer liquid and preparation method thereof Download PDFInfo
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- CN103555304A CN103555304A CN201310557399.9A CN201310557399A CN103555304A CN 103555304 A CN103555304 A CN 103555304A CN 201310557399 A CN201310557399 A CN 201310557399A CN 103555304 A CN103555304 A CN 103555304A
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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
Abstract
The invention relates to a high-efficiency oil-based flushing spacer liquid. The flushing spacer liquid is prepared from the following components in parts by weight: 100 parts of clear water, 1.0-1.5 parts of a surfactant, 4.0-5.0 parts of a chelating agent, 2.0-4.0 parts of a suspension stabilizer, 0.6-0.8 part of a tackifier, 0.5-0.75 part of a viscosity enhancer, 25-15 parts of a weighting agent, 1.0-5.0 parts of a pH regulator, and 0.2-0.4 part of a defoaming agent. The invention provides a special high-efficiency flushing spacer liquid for oil-based drilling fluid, which has dual functions of flushing and spacing, is high in flushing efficiency, wide in density adjusting range and good in suspension stability, and can effectively improve the conditions of interfacial cementation and improve the quality of well cementation.
Description
Technical field:
The present invention relates to oil drilling engineering cementing technology, belong to a kind of efficient oil base flushing spacer fluid of Cementing technical field and preparation method thereof.
Background technology:
For a bite well (particularly exploitation well), can the quality of cementing quality, directly have influence on this well and continue to creep into, successfully produce, and directly affects the life-span of oil well and the recovery ratio of hydrocarbon-bearing pool.
In well cementing operation, in order to improve grout, replace the efficiency of drilling fluid, improve the bonding quality of cement mantle, to be everlasting and to inject a kind of liquid between drilling fluid and grout, this liquid is called spearhead.Spearhead can be divided into washing fluid and spacer pad by its character.Washing fluid is generally and in water, adds tensio-active agent or be mixed and form with drilling fluid dilution, and its effect is: (1) dilution and dispersed drilling fluid, prevent flocculation and the gelling of drilling fluid or grout; (2) effectively wash away the loose mud cake on the borehole wall and sleeve pipe, improve the consolidation strength of cement mantle the first cement plane and the second cement plane; (3) improve the rheological of drilling fluid and grout, to realize the flocculation of grout, replace.Spacer pad is all adjustable viscous fluids of viscosity, density and gel strength, is mainly used in isolation and plug flow displacement drilling fluid, is usually used in plug flow displacement cementing design.The Main Function of spacer pad is: (1) isolates drilling fluid and grout in cementing job, cleans well, changes the wettability of sleeve surface, makes it to be easy to grout cementing, does not affect the rheological that maybe can improve grout and drilling fluid; (2) in the well of dehydration is strictly controlled in low pressure well section and weak zone and requirement, can be used as damping fluid uses; (3) prevent the pollution of grout and the flocculation multiviscosisty of drilling fluid.In actual production operation, washing fluid and spacer pad can be used alone and also can use simultaneously.
At present, there is part shortcoming and defect in the design of the flushing spacer fluid of China research and development, and design studies has hysteresis quality, and the effect of field application of the flushing spacer fluid of developing cannot reach standard-required.The long-term employing in the most of oil fields of China be take clear water as main water-base mud washing fluid, they have good developing result to water-based mud, but while using oil base drilling fluid drilling well, at the borehole wall and casing wall, can produce oil base mud cake, the generation of this mud cake can make between the borehole wall and casing wall and grout not cementing, conventional water base washing fluid cannot be rinsed well at all, finally can cause cement mantle interface agglutination poor-performing.In addition, in cementing operation, go back ubiquity temperature high, sealing segment length, the problem such as hole diameter is irregular, and mud and grout easily pollute mutually, and flush efficiency is low, and isolation effect is poor, and displacement efficiency is low, seriously restricts the raising of cementing quality.
Summary of the invention:
The object of the present invention is to provide a kind of flushing spacer fluid for oil base drilling fluid and preparation method thereof, to solve the problems such as fluid interface 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 efficient oil base flushing spacer fluid, it is characterized in that: described flushing spacer fluid is specially adapted for the oil base drilling fluid using in well cementation, and this flushing spacer fluid consists of by weight following component: 100 parts of clear water: 1.0～1.5 parts of tensio-active agents: 4.0～5.0 parts of sequestrants: 2.0～4.0 portions of suspension stabilizers: 0.6～0.8 part of tackifier: carry sticky carrying for 0.5～0.75 part and cut agent: 25～150 parts of weighting agents: 1.0～5.0 parts of pH value conditioning agents: 0.2～0.4 part of defoamer.
Described tensio-active agent 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.In the molecular formula of dodecyl polyoxyethylene (3) alcohol ether, contain three oxyethylene groups, in the molecular formula of dodecyl polyoxyethylene (9) alcohol ether, contain nine oxyethylene groups.
Described sequestrant is disodium ethylene diamine tetraacetate; Described suspension stabilizer is a kind of in sodium bentonite, sepiolite or attapulgite; Described tackifier are a kind of in Natvosol, Xylo-Mucine or treated starch; Described carrying sticky carries that to cut agent be sodium carbonate or calcium carbonate; Described weighting agent is a kind of in ground barium sulfate, water-ground limestone or ilmenite powder; Described pH value conditioning agent is sodium hydroxide or potassium hydroxide; Described defoamer is silicone antifoam agent.
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, stir 30min, room temperature is placed 24h, then adds successively 0.5～0.75 part to carry sticky carrying and cut agent, 4.0～5.0 parts of sequestrants, 1.0～1.5 parts of tensio-active agents, stir; Another part of clear water adds 0.6～0.8 part of tackifier, stir 30min, two parts of solution are mixed and stirred, add 25～150 parts of weighting agents to the density requiring, then add 1.0～5.0 parts of pH value conditioning agents, making the pH value of flushing spacer fluid is 8～11, stirs 1 hour, finally according to practical situation, adds 0.2～0.4 part of defoamer.
The present invention compares with existing other flushing spacer fluids, has the following advantages: 1. washing fluid and spacer pad are united two into one, have and rinse and isolation dual-use function.2. oil-base mud and oil base mud cake are had to good rinse capability and developing result, flush efficiency can reach 100%.3. density is at 1.10g/cm
3～1.80g/cm
3adjustable in scope, can guarantee strong well, deep & ultra-deep well bottomhole wellbore pressure balance.4. suspension stability is good, under normal temperature and hot conditions, all can keep good suspension stability.5. rheological property regulates and controls flexibly.During rig-site utilization, by construction requirement, carry out rheological parameter appropriate design and the cementing operation parameter designing of flushing spacer fluid turbulent flow or plug flow, can reduce the design difficulty of grout, improve displacement efficiency.
Embodiment:
The present invention compares with current achievement in research, can better remove oil-base mud and oil base mud cake, have and rinse and isolation dual-use function, can improve the affinity of second interface, there is the wide in range density scope of application simultaneously, suspension stability is good, and preparation is simple, has practicality widely.
Below the present invention is described further:
A kind of efficient oil base flushing spacer fluid, it is characterized in that: described flushing spacer fluid is specially adapted for the oil base drilling fluid using in well cementation, and this flushing spacer fluid consists of by weight following component: 100 parts of clear water: 1.0～1.5 parts of tensio-active agents: 4.0～5.0 parts of sequestrants: 2.0～4.0 portions of suspension stabilizers: 0.6～0.8 part of tackifier: carry sticky carrying for 0.5～0.75 part and cut agent: 25～150 parts of weighting agents: 1.0～5.0 parts of pH value conditioning agents: 0.2～0.4 part of defoamer.
Described tensio-active agent, by dodecyl polyoxyethylene (3) alcohol ether (AEO3), dodecyl polyoxyethylene (9) alcohol ether (AEO9), sorbitan monooleate polyxyethylated alcohol (Tween80) and composite the forming of sodium lauryl sulphate (SDS), is: AEO3:AEO9:Tween80:SDS=1:2:3:3 by weight.In the molecular formula of dodecyl polyoxyethylene (3) alcohol ether, contain three oxyethylene groups, in the molecular formula of dodecyl polyoxyethylene (9) alcohol ether, contain nine oxyethylene groups.
Described sequestrant is disodium ethylene diamine tetraacetate; Described suspension stabilizer is a kind of in sodium bentonite, sepiolite or attapulgite; Described tackifier are a kind of in Natvosol, Xylo-Mucine or treated starch; Described carrying sticky carries that to cut agent be sodium carbonate or calcium carbonate; Described weighting agent is a kind of in ground barium sulfate, water-ground limestone or ilmenite powder; Described pH value conditioning agent is sodium hydroxide or potassium hydroxide; Described defoamer is silicone antifoam agent.
This flushing spacer fluid is used the compound system of nonionogenic tenside and anion surfactant, nonionogenic tenside good stability wherein, acid and alkali, alkali, salt impact, stability in hard water is good, and there is good emulsifying and soil removability, good with other surfactant compatibility, add a small amount of anion surfactant can improve its cloud point, expand use range.AEO3 is a kind of lipophilic emulsifier, greasy dirt is had to good emulsifying and scourability, AEO9 is the emulsifying agent of good O/W type, there is low foaming and polymolecularity, Tween80 has more intense wetting ability, general as wetting agent, emulsifying agent, permeate agent, SDS is soluble in water, has good emulsifying, decontamination, infiltration, dispersiveness.The existing lipophilicity of this compound system has again wetting ability, can 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 (to press clear water total, lower same) suspension stabilizer, stir 30min, room temperature is placed 24h, then adds successively 0.5～0.75 part to carry sticky carrying and cut agent, 4.0～5.0 parts of sequestrants, 1.0～1.5 parts of tensio-active agents, stir.Another part of clear water adds 0.6～0.8 part of tackifier, stir 30min, two parts of solution are mixed and stirred, add 25～150 parts of weighting agents to the density requiring, then adding 1.0～5.0 parts of pH value conditioning agents to make the pH value of flushing spacer fluid is 8～11, stir 1 hour, finally according to practical situation, add 0.2～0.4 part of defoamer.
In the preparation method of this flushing spacer fluid, it is in order to guarantee that suspension agent and tackifier are uniformly dispersed in solution that 100 parts of clear water are divided into two parts.The water-soluble rear thick solution that all forms of suspension agent and tackifier, if successively add with being unfavorable for forming stable homogeneous solution in a clear water.
Make as stated above 8 kinds of flushing spacer fluids, component proportion sees attached list 1.
Suspension stability to 8 kinds of flushing spacer fluids is tested, and the results are shown in subordinate list 2.Experimental result shows flushing spacer fluid Auto-regulating System of Density of Heavy Medium wide ranges, and from 1.12～1.80 can free adjustment, under normal temperature and heating condition, standing rear levels density difference be all less than or equal to 0.02g/cm
3, there is well suspended stability.
Rheological to 8 kinds of flushing spacer fluids is tested, and the results are shown in subordinate list 3 and 4.In table, data draw, the rheological parameter n of flushing spacer fluid is between 0.6～0.8, and K is less than 1.0, has good rheological.
Embodiment 1, according to each component proportion in the preparation method of above-mentioned flushing spacer fluid and subordinate list 1, to make 1#(density be 1.12g/cm
3) flushing spacer fluid.According to standard SY/T5374-2000 Oil/gas Well cementing spearhead using method, the developing result of flushing spacer fluid liquid is tested.The instrument using in experiment is six fast rotational viscosimeters, sets rotating speed and is 200 and turn, and the oil base drilling fluid of use is self-control.Flush time is 5min, flush efficiency 100%.
Embodiment 2, according to each component proportion in the preparation method of above-mentioned flushing spacer fluid and subordinate list 1, to make 4#(density be 1.40g/cm
3) flushing spacer fluid.According to standard SY/T5374-2000 Oil/gas Well cementing spearhead using method, the developing result of flushing spacer fluid liquid is tested.The instrument using in experiment is six fast rotational viscosimeters, sets rotating speed and is 200 and turn, and the oil base drilling fluid of use is self-control.Flush time is 4.5min, flush efficiency 100%.
Embodiment 3, according to each component proportion in the preparation method of above-mentioned flushing spacer fluid and subordinate list 1, to make 8#(density be 1.80g/cm
3) flushing spacer fluid.According to standard SY/T5374-2000 Oil/gas Well cementing spearhead using method, the developing result of flushing spacer fluid liquid is tested.The instrument using in experiment is six fast rotational viscosimeters, sets rotating speed and is 200 and turn, and the oil base drilling fluid of use is self-control.Flush time is 3.5min, flush efficiency 100%.
Each component proportion data sheet in subordinate list 1 flushing spacer fluid system
Note: following formula number is the same.
The flushing spacer fluid suspension stability testing data table of subordinate list 2 different densities
The flushing spacer fluid rheometric test data sheet (room temperature) of subordinate list 3 different densities
The flushing spacer fluid rheometric test data sheet (90 ℃) of subordinate list 4 different densities
Claims (5)
1. an efficient oil base flushing spacer fluid, it is characterized in that: described flushing spacer fluid is specially adapted for the oil base drilling fluid using in well cementation, and this flushing spacer fluid consists of by weight following component: 100 parts of clear water: 1.0～1.5 parts of tensio-active agents: 4.0～5.0 parts of sequestrants: 2.0～4.0 portions of suspension stabilizers: 0.6～0.8 part of tackifier: carry sticky carrying for 0.5～0.75 part and cut agent: 25～150 parts of weighting agents: 1.0～5.0 parts of pH value conditioning agents: 0.2～0.4 part of defoamer.
2. efficient oil base flushing spacer fluid according to claim 1, it is characterized in that: described tensio-active agent 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.
3. in the molecular formula of tensio-active agent dodecyl polyoxyethylene according to claim 2 (3) alcohol ether, contain three oxyethylene groups, in the molecular formula of dodecyl polyoxyethylene (9) alcohol ether, contain nine oxyethylene groups.
4. efficient oil base flushing spacer fluid according to claim 1, is characterized in that: described sequestrant is disodium ethylene diamine tetraacetate; Described suspension stabilizer is a kind of in sodium bentonite, sepiolite or attapulgite; Described tackifier are a kind of in Natvosol, Xylo-Mucine or treated starch; Described carrying sticky carries that to cut agent be sodium carbonate or calcium carbonate; Described weighting agent is a kind of in ground barium sulfate, water-ground limestone or ilmenite powder; Described pH value conditioning agent is sodium hydroxide or potassium hydroxide; Described defoamer is silicone antifoam agent.
5. the preparation method of efficient 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, stir 30min, room temperature is placed 24h, then adds successively 0.5～0.75 part to carry sticky carrying and cut agent, 4.0～5.0 parts of sequestrants, 1.0～1.5 parts of tensio-active agents, stir; Another part of clear water adds 0.6～0.8 part of tackifier, stir 30min, two parts of solution are mixed and stirred, add 25～150 parts of weighting agents to the density requiring, then add 1.0～5.0 parts of pH value conditioning agents, making the pH value of flushing spacer fluid is 8～11, stirs 1 hour, finally according to practical situation, adds 0.2～0.4 part of defoamer.
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| CN104073225A (en) * | 2014-06-18 | 2014-10-01 | 山东省地矿工程勘察院 | Potassium salt drilling flushing fluid |
| CN104818957A (en) * | 2015-03-27 | 2015-08-05 | 中国石油化工股份有限公司 | Method for improving cement quality of cement-formation interfaces of deep wells |
| CN104910881A (en) * | 2015-04-21 | 2015-09-16 | 中国石油大学(华东) | Supercritical carbon dioxide completion fluid |
| CN104962260A (en) * | 2015-06-15 | 2015-10-07 | 中国石油天然气集团公司 | High-temperature spacer fluid suspension stabilizer for well cementation, preparation method of high-temperature spacer fluid suspension stabilizer and application of high-temperature spacer fluid suspension stabilizer |
| CN105131924A (en) * | 2015-08-18 | 2015-12-09 | 任丘市奥源石油科技有限公司 | Self-foaming flushing fluid tackifier, flushing fluid configuration reagent, and flushing fluid |
| CN105170016A (en) * | 2015-09-08 | 2015-12-23 | 中国石油大学(北京) | Surfactant, oil removing agent and preparation method thereof |
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