CN1209439C - Oil-based mud flushing liquor and preparation method thereof - Google Patents
Oil-based mud flushing liquor and preparation method thereof Download PDFInfo
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- CN1209439C CN1209439C CN 02148985 CN02148985A CN1209439C CN 1209439 C CN1209439 C CN 1209439C CN 02148985 CN02148985 CN 02148985 CN 02148985 A CN02148985 A CN 02148985A CN 1209439 C CN1209439 C CN 1209439C
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Abstract
The present invention relates to oil base mud flushing liquid and a preparation method thereof, which mainly solves the problem of the poor cementation quality of two interfaces. The preparation method is characterized in that 2.5 to 3.5 parts by weight of sodium hydroxide and 4.0 to 5.0 parts by weight of ethylene diamine tetraacetic acid are added into clear water to be uniformly stirred and to be fully dissolved; 12.0 to 12.5 parts by weight of oleic acid is added to be stirred for 20 to 30 minutes; then, 2.0 to 2.2 parts by weight of sodium dodecyl sulfate and 5.0 to 5.5 parts by weight of alkyl radical fatty alcohol polyoxyethylene ether are added to be stirred for 55 to 65 minutes; finally, an organic silicon defoaming agent can be added. The oil base mud flushing liquid has the characteristic that an annular empty interface under a well is changed from an oil wet state to a water wet state. The cementation condition of a cement annular interface is improved by the flushing liquid, and the cementation quality of the well is enhanced.
Description
Technical field:
The present invention relates to the oil drilling cementing technology, belong to used oil-base mud washing fluid in well cementation spearhead field and preparation method thereof.
Background technology:
The oil field pumped into a kind of spearhead earlier and purifies second interface to improve cementing quality in cementing operation before injecting cement.When using the oil-base mud drilling well, drilling fluid directly contacts with grout, " cement soaks " can take place in drilling fluid, produces the heavy-gravity agglutinating matter, and flowing property reduces, viscosity shear force rises, be stained with this heavy-gravity agglutinating matter and slurry oil, oil film on the borehole wall and the casing wall, or be trapped in irregular hole diameter place, be difficult to replace out, to cause cement mantle interface agglutination poor performance like this, thereby have a strong impact on the quality of casing and cementing.
At present, though it is a lot of to have the kind that is used for mud flush liquid now, oil-base mud also there is certain developing result, but also exist certain limitation, particularly work as invert mud and present " hydrophobic " characteristic at the two interfaces of sleeve pipe and stratum, cement mantle interface agglutination poor performance, no matter on flush efficiency and temperature resistance, still with on the consistency of oil-base mud, all can't satisfy the requirement of cementing quality, all will have influence on next step perforation, pressure break, formation testing, also can have influence on the accuracy and the precision of exploration admission data, and directly affect the longterm planning exploitation in oil field, produce and oil well productivity.
Summary of the invention:
Poor in order to overcome existing washing fluid consistency, the replacement rate is low, the second interface affinity is bad to make the deficiency of cementing quality difference, the invention provides a kind of oil-base mud washing fluid and preparation method thereof, the washing fluid of this method preparation can better be removed oil-base mud and oil base mud cake, improve the affinity of second interface, improve cement mantle interface agglutination performance and displacement efficiency, guarantee cementing quality.
The technical solution adopted for the present invention to solve the technical problems is: add 2.5～3.5 parts of sodium hydroxide by weight in 71.3～74.5 parts in clear water and 4.0～5.0 parts of ethylenediamine tetraacetic acid (EDTA)s evenly stir, make it abundant dissolving and add 12.0～12.5 parts of oleic acid stirrings 20～30 minutes again, and then add 2.0～2.2 parts of sodium lauryl sulphate and 5.0～5.5 parts of alkyl fatty polyoxyethylenated alcohol stirred 55～65 minutes, add silicone antifoam agent at last again.
The molecular formula of above-mentioned sodium lauryl sulphate is C
12H
25OSO
3Na, the molecular formula of alkyl fatty polyoxyethylenated alcohol is RO (CH
2CH
2O) nH, the n in the formula are 8-10, and R is C
12, Fatty Alcohol(C12-C14 and C12-C18) wherein is a single fat alcohol, oleic molecular formula is CH
3(CH
2)
7-CH=CH-(CH
2)
7COOH, the molecular formula of sodium ethylene diamine tetracetate is (NaOOCH
2C)
2-N (CH
2)
2N-(CH
2COONa)
2
The invention has the beneficial effects as follows: because this washing fluid is by the formulated of technique scheme; make this washing fluid have the effect that separates drilling fluid and grout; prevent contact stain, good with the consistency of drilling fluid, can reduce the viscosity and the shear force of drilling fluid; raising is to the displacement efficiency of drilling fluid; the more effective second interface that washes down makes grout not flocculate, dodge coagulation phenomena, has improved the consolidation strength of second interface; thereby the raising cementing quality helps the protection of hydrocarbon zone.
Embodiment
Below with the present invention is further illustrated:
The preparation method of this washing fluid is: add 2.5～3.5 parts of sodium hydroxide by weight in 71.3～74.5 parts in clear water and 4.0～5.0 parts of ethylenediamine tetraacetic acid (EDTA)s evenly stir, make it abundant dissolving and add 12.0～12.5 parts of oleic acid stirrings 20～30 minutes again, and then add 2.0～2.2 parts of sodium lauryl sulphate and 5.0～5.5 parts of alkyl fatty polyoxyethylenated alcohol stirred 55～65 minutes, add silicone antifoam agent at last again.Wherein the molecular formula of sodium lauryl sulphate is C
12H
25OSO
3Na, the molecular formula of alkyl fatty polyoxyethylenated alcohol is RO (CH
2CH
2O) nH, the n in the formula are 8-10, and R is C
12, Fatty Alcohol(C12-C14 and C12-C18) wherein is a single fat alcohol, oleic molecular formula is CH
3(CH
2)
7-CH=CH-(CH
2)
7COOH, the molecular formula of sodium ethylene diamine tetracetate is (NaOOCH
2C)
2-N (CH
2)
2N-(CH
2COONa)
2
Can take following three kinds of schemes to describe:
| Clear water | 74.5 | 72.9 | 71.3 | |
| Effect | Well depth (m) | 4280 | 3935 | 4201 |
| Drilling fluid density (g/cm 3) | 1.18 | 1.17 | 1.19 | |
| Washing fluid annular space height (m) | 616 | 676 | 597 | |
| Annular space returns speed (m/s) | 1.71 | 1.82 | 1.81 | |
| Actual injection rate (the m of washing fluid 3) | 15 | 16 | 13.5 | |
| Spacer pad injection rate (m 3) | 7 | 7 | 8 | |
| Washing fluid duration of contact (min) | 6 | 6.2 | 5.5 | |
| Flushing rate (%) | 100 | 100 | 100 | |
| Interface cementing strength (Mpa) | 1.75 | 1.93 | 1.92 | |
| Consistency | Good | Good | Good | |
| The well cementation effect | High-quality | High-quality | High-quality | |
In such scheme, the proportioning of each composition and the effect of generation are as seen, this washing fluid has good temperature resistance and chemical stability, nontoxic, low bubble, and blending process is simple, has stronger breakdown of emulsion, scouring capability, can form flushing fast and effectively to the interface slurry oil, strengthen the wetting ability of second interface, improved the interface cementing strength of cement mantle; During actual the use, this washing fluid and invert mud and mortar architecture all have consistency preferably, particularly because the effective metal ion in the chelating invert mud of the composition in this washing fluid, and can not produce phenomenons such as flocculation, precipitation, thickening, satisfy the requirement of well cementation good quality project.
Embodiment 1, in the dark 10 well construction processes of grand celebration virtue, the washing fluid that table scheme 1 is prepared in applications, the flushing rate reaches 100%, and second interface is had very strong scouring capability, helps improving the displacement efficiency to drilling fluid, has improved the consolidation strength at cement mantle interface.
Embodiment 2, in the dark 701 well construction processes of grand celebration virtue, use the washing fluid of such scheme 2 preparations, the flushing rate reaches 100%, this washing fluid effectively washes the borehole wall and casing wall, good with oil-base mud and grout consistency, detrimentally affects such as no thickening, flocculation have improved the consolidation strength of second interface, and cementing quality is good.
Embodiment 3, in the dark 8 well construction processes of grand celebration virtue, the washing fluid of using such scheme 3 preparations has amphipathic, reduced interfacial tension, infiltration solubility property to oil film is good, and the emulsification solublization is strong, and the flushing rate reaches 100%, can effectively the oil-base mud on the borehole wall and the casing wall be rinsed well, make the interface become " water is wet " by " oil wet ", help the gluing with cement mantle, improve cementing quality.
Claims (5)
1, a kind of used oil-base mud washing fluid in spearhead field of cementing the well in the oil drilling cementing technology that relates to, it is characterized in that: each composition and proportioning are as follows by weight:
2.0～2.2 parts of sodium lauryl sulphate, 5.0～5.5 parts of alkyl fatty polyoxyethylenated alcohol, 12.0～12.5 parts of oleic acid, 4.0～5.0 parts of disodium ethylene diamine tetraacetate, 2.5～3.5 parts in sodium hydroxide, 71.3～74.5 parts in clear water.
2, oil-base mud washing fluid according to claim 1 is characterized in that: the molecular formula of sodium lauryl sulphate is C
12H
25OSO
3Na.
3, oil-base mud washing fluid according to claim 1 is characterized in that: the molecular formula of alkyl fatty polyoxyethylenated alcohol is RO (CH
2CH
2O) nH, the n in the formula are 8-10, and R is C
12
4, according to claim 1,3 described oil base mud well-cementing washing fluids, it is characterized in that: the Fatty Alcohol(C12-C14 and C12-C18) in the alkyl fatty polyoxyethylenated alcohol is a single fat alcohol.
5, a kind of method for preparing oil-base mud washing fluid as claimed in claim 1, it is characterized in that: the even stirring of sequestrant that adds sodium hydroxide and disodium ethylene diamine tetraacetate by above-mentioned weight part earlier in clear water makes it abundant dissolving, add oleic acid again and stirred 20～30 minutes, add sodium lauryl sulphate and alkyl fatty polyoxyethylenated alcohol again and stirred 55～65 minutes; The above-mentioned solution for preparing is added 0.01～0.02 part silicone antifoam agent by per 100 parts weight to get final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02148985 CN1209439C (en) | 2002-11-18 | 2002-11-18 | Oil-based mud flushing liquor and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02148985 CN1209439C (en) | 2002-11-18 | 2002-11-18 | Oil-based mud flushing liquor and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1405265A CN1405265A (en) | 2003-03-26 |
| CN1209439C true CN1209439C (en) | 2005-07-06 |
Family
ID=4751594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02148985 Expired - Fee Related CN1209439C (en) | 2002-11-18 | 2002-11-18 | Oil-based mud flushing liquor and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1209439C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103849364B (en) * | 2012-11-30 | 2016-12-21 | 天津中油渤星工程科技有限公司 | Oil base drilling fluid well cementation flushing liquor and preparation method |
| CN103965845B (en) * | 2013-02-05 | 2017-04-12 | 中国石油化工股份有限公司 | Flushing fluid for cementing of horizontal shale gas well |
| CN103555306B (en) * | 2013-11-07 | 2015-12-09 | 山东大学 | A kind ofly be applicable to oil-based mud flushing liquor of high temperature and high salt environment and preparation method thereof |
| CN103555304B (en) * | 2013-11-08 | 2016-06-08 | 沈阳工业大学 | A kind of oil base flushing spacer fluid and preparation method thereof |
| CN105670587B (en) * | 2016-01-12 | 2019-02-26 | 中国海洋石油集团有限公司 | A kind of multi-functional oil base mud cleans liquid and preparation method thereof |
| CN106675541A (en) * | 2016-12-16 | 2017-05-17 | 盘锦禹和石油科技有限公司 | Water-based flushing fluid |
| CN107987819B (en) * | 2017-12-20 | 2020-06-19 | 卫辉市化工有限公司 | Low-toxicity and low-foam oil-based mud flushing agent for well cementation and preparation method thereof |
| CN109135697B (en) * | 2018-09-18 | 2020-10-16 | 中国石油集团西部钻探工程有限公司 | High-temperature-resistant ultrahigh-density oil displacement isolation liquid and preparation method thereof |
| CN111826146B (en) * | 2020-08-06 | 2021-06-29 | 中国石油大学(北京) | Method for cleaning oil-based mud by using cloud point and in-situ emulsification in synergy manner and matched cleaning agent |
| CN115725284B (en) * | 2021-08-31 | 2024-03-01 | 中国石油天然气集团有限公司 | Flushing agent and application thereof |
-
2002
- 2002-11-18 CN CN 02148985 patent/CN1209439C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1405265A (en) | 2003-03-26 |
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