CN105567185A - Oil-based drilling fluid used for depleted reservoir oilfield and adopting crude oil as continuous phase - Google Patents
Oil-based drilling fluid used for depleted reservoir oilfield and adopting crude oil as continuous phase Download PDFInfo
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- CN105567185A CN105567185A CN201511024345.1A CN201511024345A CN105567185A CN 105567185 A CN105567185 A CN 105567185A CN 201511024345 A CN201511024345 A CN 201511024345A CN 105567185 A CN105567185 A CN 105567185A
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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
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
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Abstract
The invention provides an oil-based drilling fluid used for depleted reservoir oilfield and adopting crude oil as a continuous phase. The drilling fluid comprises crude oil, a salt solution and a treatment agent, wherein a volume ratio of the crude oil to the salt solution is 70-95:5-30; the treatment agent comprises an emulsifier, a wetting agent, organoclay, a filtrate reducer and a pH adjusting agent, and 1.5-2.5g of the emulsifier, 0.5-0.8g of the wetting agent, 1-3g of organoclay, 3-6g of the filtrate reducer and 1-3g of the pH adjusting agent are added to every 100mL of the crude oil and the salt solution; and the crude oil is crude oil recovered from an adjacent well. The oil-based drilling fluid adopting crude oil as a continuous phase has same borehole wall stability, inhibition and lubrication performances with routine oil-based drilling fluids, has cheaper and more easily available continuous phase than the routine oil-based drilling fluids, and can greatly reduce the drilling cost brought by an expensive continuous phase.
Description
Technical field
The invention belongs to petroleum exploration field, being specifically related to a kind of crude oil for debilitating hydrocarbon-bearing pool oil field is the oil base drilling fluid of external phase.
Background technology
The subordinate phase of hiding exploitation along with domestic conventional gas and oil enters coda gradually, carries out in order the transformation of old block work of taping the latent power.Well pattern thickening is the key measure that high water-cut stage old block improves recovery ratio, but because old block have passed through long-term exploitation, result in reservoir pressure exhaustion, Partial Block causes pressure gap between oily group large because of heavy wool group voidage-injection imbalane, formed and overlap pressure system more, in drilling process, leakage accident frequently occurs, and brings great challenge to drilling well, can suffer larger economic pressures with the oil base drilling fluid of routine.
Summary of the invention
For overcoming the problems referred to above, the object of this invention is to provide a kind of crude oil for debilitating hydrocarbon-bearing pool oil field is the oil base drilling fluid of external phase.
Another object of the present invention is to provide the preparation method of above-mentioned oil base drilling fluid.
Another object of the present invention is to provide the application of above-mentioned oil base drilling fluid in debilitating Reservoir Development.
For achieving the above object, the invention provides a kind of crude oil for debilitating hydrocarbon-bearing pool oil field is the oil base drilling fluid of external phase, and this drilling fluid comprises: crude oil, salts solution and treatment agent, and wherein, the volume ratio of described crude oil and salts solution is 70-95:5-30; Described treatment agent comprises emulsifying agent, wetting agent, organophilic clay, fluid loss agent and pH adjusting agent, in 100mL crude oil+salts solution: the consumption of emulsifying agent is 1.5-2.5g, the consumption of wetting agent is 0.5-0.8g, the consumption of organophilic clay is 1-3g, the consumption of fluid loss agent is 3-6g, the consumption of pH adjusting agent is for 1-3g; Described crude oil is the crude oil of offset well extraction, and the proterties of crude oil is: density 0.78-0.98g/cm
3, wax content 2.0%-9.9%, viscosity 4.07-9.15mPa.s, condensation point-28 is to-4 DEG C, sulphur content 0.20%-0.88%.
Because the biggest problem run in debilitating hydrocarbon-bearing pool oil-field development is the problem that reservoir pressure coefficient is on the low side, reservoir pressure is in debt.For this reason, the present invention is by preparing drilling fluid using the crude oil (meeting the crude oil of certain condition) of offset well extraction as the base oil of oil base drilling fluid, this drilling fluid has the following advantages: first crude oil and reservoir compatibleness higher, there is better reservoir protection effect; Secondly, the use of crude oil can reduce the cost of drilling fluid; Again, the leakage that pressure deficit causes also can not pollute reservoir.
Crude oil provided by the invention is that the oil base drilling fluid of external phase is compared with conventional oil base drilling fluid, it not only has the borehole wall stability identical with conventional oil base drilling fluid, inhibition and lubricity, and compared with conventional oil base drilling fluid, there is external phase that is more cheap, that be easy to get, the drilling cost that great number external phase is brought can be reduced significantly.
Be in the oil base drilling fluid of external phase at above-mentioned crude oil, preferably, described treatment agent also comprises weighting agent, and the consumption of weighting agent is make the density of drilling fluid meet 1.0-1.5g/cm
3be as the criterion.Further preferably, described weighting agent comprises the combination of one or more in Wingdale, barite, micro-manganese and micro mist barite.
Be in the oil base drilling fluid of external phase at above-mentioned crude oil, preferably, described salts solution comprises the combination of one or more in sodium chloride solution, calcium chloride solution, sodium formate solution, potassium formate solutions and Klorvess Liquid.Further preferably, the mass concentration of described salts solution is 20-40%.
Be in the oil base drilling fluid of external phase at above-mentioned crude oil, preferably, the combination of one or more in described emulsifier package oil scraper acid di-alcohol phthalein amine, glycerine boric acid oleic acid ester and bis-fatty acid ethoxycarbonyl hydroxyethyl methyl sulfate methyl ammonium.
Be in the oil base drilling fluid of external phase at above-mentioned crude oil, preferably, described bis-fatty acid ethoxycarbonyl hydroxyethyl methyl sulfate methyl ammonium, general formula is: [(RCOOHCH
2cH
2)
2nCH
3cH
2cH
2oH]
+cH
3sO
4 -, wherein R is the alkyl of C16-C18, is preferably C
18alkyl.In drilling fluid system provided by the invention, above-mentioned several emulsifying agent can make drilling fluid in the temperature range of the oil-water ratio scope of 70:30-95:5 and 50 DEG C-120 DEG C, keeps good emulsifying stability and high-temperature stability for a long time.
Be in the oil base drilling fluid of external phase at above-mentioned crude oil, preferably, described wetting agent comprises the combination of one or more in alkylphenol polyoxyethylene, octyl phenol, sulfo-succinic acid di-isooctyl sodium.
Be in the oil base drilling fluid of external phase at above-mentioned crude oil, preferably, described organophilic clay is oleophylic clay.Described oleophylic clay be by polynite through dispersion, purify, modified, replace the metal ion between cheating engaging layer with palmityl trimethyl ammonium chloride, obtain finally by dehydration, dry, grinding.
Be in the oil base drilling fluid of external phase at above-mentioned crude oil, preferably, described fluid loss agent comprises the combination of one or more in humic acid acetamide, valchovite, rock asphalt and oxidized bitumen.
Be in the oil base drilling fluid of external phase at above-mentioned crude oil, preferably, described pH adjusting agent is calcium oxide.
Present invention also offers the preparation method of above-mentioned oil base drilling fluid, the method comprises the following steps: under agitation condition, adds emulsifying agent, organophilic clay, salts solution, fluid loss agent, pH adjusting agent and wetting agent successively, obtain oil base drilling fluid in crude oil.
Crude oil provided by the invention is the difficult problem that the oil base drilling fluid of external phase successfully solves drilling fluid leakage Frequent Accidents in debilitating Reservoir Development.Not only reduce leakage formation damage (even if leakage, main component is also the crude oil of productive formation, therefore, the impact of formation environment is less), and greatly reduce economic pressures that leakage accident causes (oil phase after leakage in drilling fluid, also can with fresh oil in the lump extraction in follow-up exploitation).Meanwhile, drilling fluid uses the oil phase of productive formation, effectively reduces the preparation cost of oil base drilling fluid.
Crude oil provided by the present invention is the oil base drilling fluid beneficial effect of external phase:
1, the base oil that the solution of the present invention adopts comes in scene, low price, and supporting treatment agent dosage is few, and can effectively reduce oil base drilling fluid cost, comprehensive cost is low, and economic benefit is given prominence to.
2, scheme provided by the invention, the compatibleness of drilling fluid and reservoir is strong, and the injury caused reservoir after leaking is less.
3, scheme provided by the invention, low for reservoir pressure coefficient, and weighting agent usage quantity is little, greatly can alleviate solid phase particles injury.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Use same crude oil in embodiment 1-3, in table 1 and table 2, compared for physical properties and the rheological of the two of crude oil and petrifaction diesel respectively:
Table 1 crude oil and diesel oil physical properties contrast
Table 2 crude oil and diesel oil rheological property contrast
Embodiment 1
Present embodiments provide the oil base drilling fluid that a kind of crude oil is external phase, the component preparing this drilling fluid comprises:
Crude oil, 270mL;
Salts solution, the CaCl of 20%
2solution 30mL;
Emulsifying agent, oleic acid di-alcohol phthalein amine 6g;
Organophilic clay, 6g;
Fluid loss agent, oxidized bitumen 12g;
PH adjusting agent, calcium oxide 6g;
Wetting agent, alkylphenol polyoxyethylene 1.5g;
Weighting agent, Wingdale;
The step preparing this drilling fluid comprises:
Oleic acid di-alcohol phthalein amine is added, high-speed stirring (11000r/min) 20min in crude oil; Then CaCl is added
2solution high-speed stirring (11000r/min) 20min; Then add organophilic clay, stir 20min; Then add oxidized bitumen, stir 10min; Then add calcium oxide, stir 10min; Then add alkylphenol polyoxyethylene, and add weighting agent and be exacerbated to 1.2g/cm
3, stir 20min and obtain oil base drilling fluid.
Performance test (test result is in table 1) is carried out to obtained oil base drilling fluid:
Obtained oil base drilling fluid is heated to 50 DEG C and measures its rheological;
Pour in digestion tank by the drilling fluid after above-mentioned being completed, at 120 DEG C, aging 16h, is cooled to room temperature after aging, opens digestion tank, pours the crude oil base oil base drilling fluid after aging into height and stirs in cup, stirs 20min, and again surveys its rheological at 50 DEG C.
Embodiment 2
Present embodiments provide the oil base drilling fluid that a kind of crude oil is external phase, the component preparing this drilling fluid comprises:
Crude oil, 270mL;
Salts solution, the CaCl of 20%
2solution 30mL;
Emulsifying agent, glycerine boric acid oleic acid ester 4.5g;
Organophilic clay, 4.5g;
Fluid loss agent, rock asphalt 15g;
PH adjusting agent, calcium oxide 9g;
Wetting agent, octyl phenol 1.5g;
Weighting agent, Wingdale.
The step preparing this drilling fluid comprises:
Glycerine boric acid oleic acid ester is added, high-speed stirring (11000r/min) 20min in crude oil; Then CaCl is added
2solution high-speed stirring (11000r/min) 20min; Then add organophilic clay, stir 20min; Then add rock asphalt, stir 10min; Then add calcium oxide, stir 10min; Then add octyl phenol, and be exacerbated to 1.2g/cm with Wingdale
3, stir 20min and obtain oil base drilling fluid.
Performance test (test result is in table 1) is carried out to obtained oil base drilling fluid:
Obtained oil base drilling fluid is heated to 50 DEG C and measures its rheological;
Pour in digestion tank by the drilling fluid after above-mentioned being completed, at 120 DEG C, aging 16h, is cooled to room temperature after aging, opens digestion tank, pours the crude oil base oil base drilling fluid after aging into height and stirs in cup, stirs 20min, and again surveys its rheological at 50 DEG C.
Embodiment 3
Present embodiments provide the oil base drilling fluid that a kind of crude oil is external phase, the component preparing this drilling fluid comprises:
Crude oil, 270mL;
Salts solution, the CaCl of 20%
2solution 30mL;
Emulsifying agent, bis-fatty acid ethoxycarbonyl hydroxyethyl methyl sulfate methyl ammonium 6g ([(C
18h
37cOOHCH
2cH
2)
2nCH
3cH
2cH
2oH]
+cH
3sO
4 -);
Organophilic clay, 3g;
Fluid loss agent, valchovite 12g;
PH adjusting agent, calcium oxide 6g;
Wetting agent, sulfo-succinic acid di-isooctyl sodium 1.5g;
Weighting agent, Wingdale;
The step preparing this drilling fluid comprises:
Bis-fatty acid ethoxycarbonyl hydroxyethyl methyl sulfate methyl ammonium is added, high-speed stirring (11000r/min) 20min in crude oil; Then CaCl is added
2solution high-speed stirring (11000r/min) 20min; Then add organophilic clay, stir 20min; Then add valchovite, stir 10min; Then add calcium oxide, stir 10min; Then add sulfo-succinic acid di-isooctyl sodium, and add weighting agent and be exacerbated to 1.2g/cm
3, stir 20min and obtain oil base drilling fluid.
Performance test (test result is in table 3) is carried out to obtained oil base drilling fluid:
Obtained oil base drilling fluid is heated to 50 DEG C and measures its rheological;
Pour in digestion tank by the drilling fluid after above-mentioned being completed, at 120 DEG C, aging 16h, is cooled to room temperature after aging, opens digestion tank, pours the crude oil base oil base drilling fluid after aging into height and stirs in cup, stirs 20min, and again surveys its rheological at 50 DEG C.
The performance test of table 3 oil base drilling fluid
Note: aging condition is aging 16h at 120 DEG C.
Test case 1
The reservoir damage that this test case provides oil base drilling fluid is tested, and test result is in table 4.
On-the-spot oil base drilling fluid: water oil ratio is 80:20; Density is 1.2g/cm
3;
By percentage to the quality, this drilling fluid also comprises: 2% primary emulsion+2% auxiliary emulsifying agent+2% organophilic clay+4% oxidized bitumen+2% calcium oxide+1% wetting agent+weighting agent (Wingdale).
Potassium sulphonated polymer mud: density is 2.0g/cm
3; Every 100 parts of water comprise following component (by percentage to the quality): 2% wilkinite+0.5%NaOH+5%SMP+7%KCl+2% anti-sloughing agent+3%SMC+1% lubricant+weighting agent (barite).
The reservoir damage experiment test of table 4 oil base drilling fluid
The test result of table 4 shows; in the process of permeability resume figure measuring; the filter loss of original oil-based drilling fluid is larger; but due to the base fluid of crude oil drilling fluid and the compatibleness of rock core better; so its permeability resume figure is more than 90%; higher than other two kinds of drilling fluids, there is good reservoir protection effect.
Claims (10)
1. the crude oil for debilitating hydrocarbon-bearing pool oil field is an oil base drilling fluid for external phase, and this drilling fluid comprises: crude oil, salts solution and treatment agent, wherein,
The volume ratio of described crude oil and salts solution is 70-95:5-30;
Described treatment agent comprises emulsifying agent, wetting agent, organophilic clay, fluid loss agent and pH adjusting agent, in 100mL crude oil+salts solution: the consumption of emulsifying agent is 1.5-2.5g, the consumption of wetting agent is 0.5-0.8g, the consumption of organophilic clay is 1-3g, the consumption of fluid loss agent is 3-6g, the consumption of pH adjusting agent is for 1-3g;
Described crude oil is the crude oil of offset well extraction, and the proterties of crude oil is: density 0.78-0.98g/cm
3, wax content 2.0%-9.9%, viscosity 4.07-9.15mPa.s, condensation point-28 is to-4 DEG C, sulphur content 0.20%-0.88%.
2. oil base drilling fluid according to claim 1, wherein, described treatment agent also comprises weighting agent, and the consumption of weighting agent is make the density of drilling fluid meet 1.0-1.5g/cm
3be as the criterion.
3. oil base drilling fluid according to claim 2, wherein, described weighting agent comprises the combination of one or more in Wingdale, barite, micro-manganese and micro mist barite.
4. oil base drilling fluid according to claim 1, wherein, described salts solution comprises the combination of one or more in sodium chloride solution, calcium chloride solution, sodium formate solution, potassium formate solutions and Klorvess Liquid;
Preferably, the mass concentration of described salts solution is 20-40%.
5. oil base drilling fluid according to claim 1, wherein, the combination of one or more in described emulsifier package oil scraper acid di-alcohol phthalein amine, glycerine boric acid oleic acid ester and bis-fatty acid ethoxycarbonyl hydroxyethyl methyl sulfate methyl ammonium.
6. oil base drilling fluid according to claim 5, wherein, described bis-fatty acid ethoxycarbonyl hydroxyethyl methyl sulfate methyl ammonium, general formula is: [(RCOOHCH
2cH
2)
2nCH
3cH
2cH
2oH]
+cH
3sO
4 -, wherein R is the alkyl of C16-C18; Further preferably, R is C
18alkyl.
7. oil base drilling fluid according to claim 1, wherein, described wetting agent comprises the combination of one or more in alkylphenol polyoxyethylene, octyl phenol and sulfo-succinic acid di-isooctyl sodium.
8. oil base drilling fluid according to claim 1, wherein, described organophilic clay is oleophylic clay;
Preferably, described oleophylic clay be by polynite through dispersion, purify, modified, replace the metal ion between cheating engaging layer with palmityl trimethyl ammonium chloride, obtain finally by dehydration, dry, grinding.
9. oil base drilling fluid according to claim 1, wherein, described fluid loss agent comprises the combination of one or more in humic acid acetamide, valchovite, rock asphalt and oxidized bitumen;
Preferably, described pH adjusting agent is calcium oxide.
10. the crude oil for debilitating hydrocarbon-bearing pool oil field prepared described in claim 1-9 any one is a preparation method for the oil base drilling fluid of external phase, and the method comprises the following steps:
Under agitation condition, in crude oil, add emulsifying agent, salts solution, organophilic clay, fluid loss agent, pH adjusting agent and wetting agent successively, obtain oil base drilling fluid.
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|---|---|---|---|
| CN201511024345.1A CN105567185B (en) | 2015-12-30 | 2015-12-30 | A kind of crude oil for debilitating oil-gas reservoir oil field is the oil base drilling fluid of continuous phase |
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|---|---|---|---|
| CN201511024345.1A CN105567185B (en) | 2015-12-30 | 2015-12-30 | A kind of crude oil for debilitating oil-gas reservoir oil field is the oil base drilling fluid of continuous phase |
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| CN105567185B CN105567185B (en) | 2018-09-04 |
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| CN114560883A (en) * | 2022-03-07 | 2022-05-31 | 西安石油大学 | Boron-containing spiro crude oil treating agent and preparation method thereof |
| CN114806518A (en) * | 2021-01-21 | 2022-07-29 | 中国石油天然气股份有限公司 | Oil-based drilling fluid composition and oil-based drilling fluid |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111484835A (en) * | 2020-04-23 | 2020-08-04 | 新疆塔里木油田建设工程有限责任公司 | Water-soluble oil-based drilling fluid lubricant and preparation method thereof |
| CN114806518A (en) * | 2021-01-21 | 2022-07-29 | 中国石油天然气股份有限公司 | Oil-based drilling fluid composition and oil-based drilling fluid |
| CN114560883A (en) * | 2022-03-07 | 2022-05-31 | 西安石油大学 | Boron-containing spiro crude oil treating agent and preparation method thereof |
| CN114560883B (en) * | 2022-03-07 | 2024-01-26 | 西安石油大学 | Boron-containing spiro-type crude oil treating agent and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN105567185B (en) | 2018-09-04 |
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