CN113773817A - Oil-based drilling fluid emulsifier with low-temperature fluidity - Google Patents
Oil-based drilling fluid emulsifier with low-temperature fluidity Download PDFInfo
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- CN113773817A CN113773817A CN202111117161.5A CN202111117161A CN113773817A CN 113773817 A CN113773817 A CN 113773817A CN 202111117161 A CN202111117161 A CN 202111117161A CN 113773817 A CN113773817 A CN 113773817A
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- emulsifier
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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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- 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
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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- General Life Sciences & Earth Sciences (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Lubricants (AREA)
Abstract
The invention discloses an oil-based drilling fluid emulsifier with low-temperature fluidity, and belongs to the technical field of petroleum drilling fluid additives. The emulsifier for the oil-based drilling fluid comprises the following components in parts by weight: 20-30 parts of emulsifier base material A, 20-30 parts of emulsifier base material B, 25-30 parts of tall oil acid, 10-15 parts of dioctyl terephthalate and 10-15 parts of acetyl tributyl citrate; the emulsifier base material A is prepared by mixing tall oil acid and epoxypropane and then reacting at the pressure of 0.1-0.5 MPa and the temperature of 150-180 ℃; the emulsifier base material B is prepared by reacting tall oil acid and maleic anhydride at 160-200 ℃, and then adding hydroxyethyl ethylenediamine for reaction. The oil-based drilling fluid emulsifier has strong emulsifying capacity and can show good fluidity at the low temperature of minus 25 ℃.
Description
Technical Field
The invention relates to the technical field of petroleum drilling fluid additives, in particular to an oil-based drilling fluid emulsifier with low-temperature fluidity.
Background
Most of wells in complex stratum development wells use the oil-based drilling fluid, along with the gradual expansion of exploration resources to remote areas such as Xinjiang and the sea, the outdoor operation temperature is as low as-15 ℃, and even as low as-30 ℃ in some extremely cold areas, so that the oil-based drilling fluid additive needs to have good fluidity at low temperature; in these areas, the temperature difference between the morning and the evening is large, and the drilling fluid is required to have good stability and rheological property at low temperature and high temperature. The emulsifier is a core treating agent of the oil-based drilling fluid and plays an important role in ensuring the emulsion stability and the rheological stability of the oil-based drilling fluid. At present, most of the common emulsifiers at home and abroad are liquid emulsifiers, and the high temperature resistance and the emulsifying property of the emulsifiers meet the requirements of rheological property and emulsion stability of the oil-based drilling fluid, thereby meeting the requirements of on-site construction of the oil-based drilling fluid. However, some liquid emulsifiers are fluid at high temperature, but viscous fluid and wax-like at low temperature, which causes great inconvenience to transportation, sampling and field use.
Disclosure of Invention
The invention aims to overcome the technical defects, provides the oil-based drilling fluid emulsifier with low-temperature fluidity, and solves the technical problem that the oil-based drilling fluid emulsifier in the prior art has poor fluidity at low temperature.
In order to achieve the technical purpose, the technical scheme of the invention provides an oil-based drilling fluid emulsifier with low temperature fluidity, which comprises the following components in parts by weight: 20-30 parts of emulsifier base material A, 20-30 parts of emulsifier base material B, 25-30 parts of tall oil acid, 10-15 parts of dioctyl terephthalate and 10-15 parts of acetyl tributyl citrate; the emulsifier base material A is prepared by mixing tall oil acid and epoxypropane and then reacting at the pressure of 0.1-0.5 MPa and the temperature of 150-180 ℃; the emulsifier base material B is prepared by reacting tall oil acid and maleic anhydride at 160-200 ℃, and then adding hydroxyethyl ethylenediamine for reaction.
Further, in the prepared emulsifier base material A, the mass ratio of the tall oil acid to the propylene oxide is (25-28) to (5-8).
Further, in the prepared emulsifier base material B, the mass ratio of the tall oil acid to the maleic anhydride is (5-6): 2-3.
Further, in the prepared emulsifier base material B, the mass ratio of the maleic anhydride to the hydroxyethyl ethylenediamine is (1-1.5): 1.
Further, reacting for 24-28 h at the temperature of 150-180 ℃ in the prepared emulsifier base material A.
Further, reacting for 6-8 h at 160-200 ℃ in the prepared emulsifier base material B.
And further, adding the hydroxyethyl ethylenediamine into the emulsifier base material B for reaction for 5-7 h.
Compared with the prior art, the invention has the beneficial effects that:
(1) the oil-based drilling fluid emulsifier with low-temperature fluidity at low temperature shows good fluidity at the low temperature of-25 ℃.
(2) The demulsification voltage value of the emulsifier with low-temperature fluidity at low temperature of the oil-based drilling fluid is more than 1300V; the drilling fluid has strong emulsification stability and does not separate out after standing for 24 hours; wide application temperature range, strong emulsifying capacity and electric stability.
(3) The oil-based drilling fluid emulsifier disclosed by the invention is simple in preparation process, convenient to operate, lower in cost and stable in product quality. Compared with the traditional oil-based drilling fluid emulsifier, the emulsifier disclosed by the invention is more resistant to low temperature, and is more convenient to transport, store and construct.
Detailed Description
The specific embodiment provides an oil-based drilling fluid emulsifier with low temperature fluidity, which comprises the following components in parts by weight: 20-30 parts of emulsifier base material A, 20-30 parts of emulsifier base material B, 25-30 parts of tall oil acid, 10-15 parts of dioctyl terephthalate and 10-15 parts of acetyl tributyl citrate; adding tall oil acid and epoxypropane into a dry reaction kettle for mixing to obtain an emulsifier base material A, wherein the mass ratio of the tall oil acid to the epoxypropane is (25-28) to (5-8), and then controlling the pressure to be 0.1-0.5 MPa and the temperature to be 150-180 ℃ for reacting for 24-28 h to obtain the emulsifier base material A; the emulsifier base material B is prepared by reacting tall oil acid and maleic anhydride for 6-8 hours at 160-200 ℃ according to a mass ratio of (5-6) to (2-3), then adding hydroxyethyl ethylenediamine for reacting for 5-7 hours, wherein the mass ratio of the maleic anhydride to the hydroxyethyl ethylenediamine is (1-1.5): 1, the tall oil acid and the maleic anhydride are subjected to anhydride esterification, and the hydroxyethyl ethylenediamine is added for acylation.
The ring-opening reaction of the propylene oxide and the tall oil acid generate substitution reaction to generate the emulsifier base material A.
The oil-based drilling fluid emulsifier with low-temperature fluidity provided by the embodiment is prepared by uniformly mixing and stirring all the components.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment provides an oil-based drilling fluid emulsifier with low temperature fluidity, which comprises the following components in parts by weight: 25 parts of emulsifier base a, 30 parts of emulsifier base B, 27 parts of tall oil acid, 13 parts of dioctyl terephthalate and 10 parts of acetyl tributyl citrate; the emulsifier base material A is prepared by adding tall oil acid and propylene oxide into a dry reaction kettle for mixing, wherein the mass ratio of the tall oil acid to the propylene oxide is 25:6, and then reacting for 28h at the temperature of 160 ℃ under the pressure of 0.2 MPa; the emulsifier base material B is prepared by reacting tall oil acid and maleic anhydride at 180 ℃ for 8 hours according to the mass ratio of 2:1, and then adding hydroxyethyl ethylenediamine to react for 5 hours, wherein the mass ratio of the maleic anhydride to the hydroxyethyl ethylenediamine is 1: 1.
Example 2
The embodiment provides an oil-based drilling fluid emulsifier with low temperature fluidity, which comprises the following components in parts by weight: 20 parts of emulsifier base a, 25 parts of emulsifier base B, 30 parts of tall oil acid, 10 parts of dioctyl terephthalate and 15 parts of acetyl tributyl citrate; the emulsifier base material A is prepared by adding tall oil acid and propylene oxide into a dry reaction kettle for mixing, wherein the mass ratio of the tall oil acid to the propylene oxide is 28:5, and then reacting for 24 hours at the temperature of 180 ℃ under the pressure of 0.8 MPa; the emulsifier base material B is prepared by reacting tall oil acid and maleic anhydride at a mass ratio of 5:2 at 160 ℃ for 8 hours, and then adding hydroxyethyl ethylenediamine to react for 5 hours, wherein the mass ratio of the maleic anhydride to the hydroxyethyl ethylenediamine is 1.5: 1.
Example 3
The embodiment provides an oil-based drilling fluid emulsifier with low temperature fluidity, which comprises the following components in parts by weight: 30 parts of emulsifier base a, 20 parts of emulsifier base B, 25 parts of tall oil acid, 15 parts of dioctyl terephthalate and 10 parts of acetyl tributyl citrate; the emulsifier base material A is prepared by adding tall oil acid and propylene oxide into a dry reaction kettle for mixing, wherein the mass ratio of the tall oil acid to the propylene oxide is 13:4, and then reacting for 25h at the temperature of 180 ℃ under the pressure of 0.1 MPa; the emulsifier base material B is prepared by reacting tall oil acid and maleic anhydride at a mass ratio of 28:13 at 200 ℃ for 6 hours, and then adding hydroxyethyl ethylenediamine to react for 5 hours, wherein the mass ratio of the maleic anhydride to the hydroxyethyl ethylenediamine is 1.1: 1.
Application performance testing and results
1. Flow properties at low temperatures
The pour points and the pour points of the examples 1-3 are tested according to the methods specified in GB/T510-2018 petroleum product pour point determination method and GB/T3535-2006 petroleum product pour point determination method, and the flow performance of the oil-based drilling fluid emulsifier at low temperature is characterized by the pour points and the pour points.
Table 1 pour and set point testing of oil-based drilling fluid emulsifiers of examples 1-3
| Test sample | Pour point (. degree. C.) | Freezing point (. degree. C.) |
| Example 1 | -30 | -33 |
| Example 2 | -33 | -36 |
| Example 3 | -27 | -30 |
The data in the table 1 show that the pour point and the condensation point of the emulsifier for the oil-based drilling fluid provided by the invention are both below-25 ℃, and the emulsifier has good flowing property at low temperature, and can meet the flowing property requirement of outdoor drilling operation at-25 ℃ on the liquid additive.
2. Determination of the breaking Voltage
The demulsification voltage value of the invention is tested according to the method specified in part 5.4 of SY/T6615-2005 emulsifier evaluation program for drilling fluid in the oil and gas industry standard, and the test result is shown in Table 2.
TABLE 2 results of measurement of demulsification voltage values of examples 1 to 3
| Test sample | ES(V) |
| Example 1 | 1456 |
| Example 2 | 1514 |
| Example 3 | 1398 |
Note: ES is the demulsification voltage value, which represents the electrical stability of the oil-based drilling fluid, and the higher the demulsification voltage, the stronger the stability of the oil-based drilling fluid.
The data in Table 2 show that the oil-based drilling fluid emulsifier has good electrical stability, shows that the demulsification voltage values are all larger than 400V, and reaches the emulsifier use standard.
3. Evaluation of emulsion stability of drilling fluid
The oil-separating state of the emulsifier for the oil-based drilling fluid is tested after standing for 24 hours according to a method specified in 5.6 in oil and gas industry standard SYT6615-2005 emulsifier evaluation program for drilling fluid. After standing for 24 hours, the three oil-based drilling fluid emulsifiers provided by the invention have no oil separation and show good emulsification stability.
4. Evaluation of oil-based drilling fluid Performance
The invention adopts the following oil-based drilling fluid system to evaluate the electric stability of the emulsifier of the oil-based drilling fluid, and comprises the following steps.
The test was carried out as follows:
preparing the oil-based drilling fluid: 210ml of 3# white oil is put into a 1000ml high-stirring cup, 9.0g of oil-based drilling fluid emulsifier, 9.0g of organic soil, 3.0g of sulfonated asphalt, 3.0g of calcium oxide, 90ml of calcium chloride aqueous solution with the mass fraction of 26% (weighed to 0.01g) and barite weighted to 1.8g/cm are sequentially added into the cup by an electric stirrer at the rotating speed of 1000r/min while stirring3。
Nine parts of oil-based drilling fluid are taken, and the oil-based drilling fluid emulsifier in the embodiment 1-3 is added into each three parts of oil-based drilling fluid respectively to obtain three test samples in the embodiment 1-3; loading three test samples corresponding to each embodiment into an aging kettle of a high-temperature stainless steel tank, and placing the aging kettle into a roller heating furnace to age for 16h at 120 ℃, 150 ℃ and 180 ℃ respectively; and cooling the nine parts of the oil-based drilling fluid to room temperature, stirring at a high speed of 12000r/min for 20min, taking down the high-stirring cup, heating to 50 +/-3 ℃, and measuring the rheological property, the electric stability and the high-temperature and high-pressure fluid loss properties after aging, wherein the test results are shown in table 3.
TABLE 3 evaluation of oil-based drilling fluids
Note: PV is plastic viscosity; YP is dynamic shear force; FLHTHP is the high temperature and high pressure fluid loss.
The evaluation result of the oil-based drilling fluid performance is shown in table 3, and the oil-based drilling fluid has small rheological property change amplitude, a demulsification voltage value larger than 900V, good rheological property and emulsion stability along with the temperature rise in the range of 120-180 ℃.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. The oil-based drilling fluid emulsifier with low temperature fluidity is characterized by comprising the following components in parts by weight: 20-30 parts of emulsifier base material A, 20-30 parts of emulsifier base material B, 25-30 parts of tall oil acid, 10-15 parts of dioctyl terephthalate and 10-15 parts of acetyl tributyl citrate; the emulsifier base material A is prepared by mixing tall oil acid and epoxypropane and then reacting at the pressure of 0.1-0.5 MPa and the temperature of 150-180 ℃; the emulsifier base material B is prepared by reacting tall oil acid and maleic anhydride at 160-200 ℃, and then adding hydroxyethyl ethylenediamine for reaction.
2. The oil-based drilling fluid emulsifier with low temperature fluidity according to claim 1, wherein the mass ratio of the tall oil acid to the propylene oxide in the emulsifier base material A is (25-28) to (5-8).
3. The oil-based drilling fluid emulsifier with low temperature fluidity according to claim 1, wherein the mass ratio of the tall oil acid to the maleic anhydride in the emulsifier base material B is (5-6) to (2-3).
4. The oil-based drilling fluid emulsifier with low temperature fluidity according to claim 1, wherein the mass ratio of the maleic anhydride to the hydroxyethylethylene diamine in the emulsifier base material B is (1-1.5): 1.
5. The oil-based drilling fluid emulsifier with low temperature fluidity according to claim 1, wherein the emulsifier base material A is prepared and reacted for 24-28 h at the temperature of 150-180 ℃.
6. The oil-based drilling fluid emulsifier with low temperature fluidity according to claim 1, wherein the emulsifier base material B is prepared by reacting for 6-8 hours at 160-200 ℃.
7. The oil-based drilling fluid emulsifier with low temperature fluidity according to claim 1, wherein the hydroxyethyl ethylenediamine is added into the emulsifier base material B after the emulsifier base material B is prepared, and the reaction is carried out for 5 to 7 hours.
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2021
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Denomination of invention: An oil-based drilling fluid emulsifier with low-temperature fluidity Effective date of registration: 20230530 Granted publication date: 20221227 Pledgee: Bank of China Limited Jingzhou Branch Pledgor: JINGZHOU JIAHUA TECHNOLOGY Co.,Ltd. Registration number: Y2023420000213 |