CN110564385A - High-temperature-resistant high-density oil-based drilling fluid for drilling shale and preparation method thereof - Google Patents
High-temperature-resistant high-density oil-based drilling fluid for drilling shale and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-temperature-resistant high-density oil-based drilling fluid for drilling shale and a preparation method thereof, wherein the drilling fluid comprises the following components: 240 parts of 0# diesel oil, 2-4 parts of a main emulsifier, 1.5-2.5 parts of an auxiliary emulsifier, 2-4 parts of a filtrate reducer, 1-1.5 parts of organic soil, 2-4 parts of a shear improver, 1-2 parts of a wetting agent, 60 parts of a 25% calcium chloride aqueous solution, 2 parts of an alkalinity regulator and 0-783 parts of barite powder, wherein the high-temperature resistant high-density oil-based drilling fluid can be used for drilling into a shale stratum, and the oil-water ratio is 8: 2, density of 2.2g/cm3The drilling fluid resists the temperature of 180 ℃, the rheological property of the drilling fluid is less influenced by the temperature, the performance is stable, and the application range is wide. The drilling fluid has stable performance and high demulsification voltage, the rheological property of the drilling fluid is easy to control under the conditions of high temperature and high density, the viscosity of the drilling fluid is not changed greatly under the high temperature condition, and the problem of high-temperature viscosity increase of the asphalt filtrate reducer used in the oil-based drilling fluid is solved.
Description
Technical Field
The invention relates to the technical field of petroleum, natural gas and shale gas drilling, in particular to a high-temperature-resistant high-density oil-based drilling fluid for drilling shale and a preparation method thereof.
background
as society develops, the demand for primary energy consumption increases, where the demand for oil and gas will increase from the current 7.2 to 11.5 million tons oil equivalent, rising from 24 to 31% by weight. According to statistics, the petroleum reserves of about 85 multiplied by 108t are not discovered in China so far, and 73 percent of the petroleum reserves are buried in the deep layer, so that the deep oil and gas resource exploration and development is the key for improving the comprehensive national strength of China and the oil and gas exploration and development benefits of various petroleum companies.
The drilling fluid is used as 'blood' of drilling engineering, plays a vital role in the whole drilling process, and the requirements on the performances of the drilling fluid are higher and higher due to the improvement of the drilling process technology, the increase of the number of horizontal wells and multi-branch wells, the increase of the drilling depth and the increase of the drilling depth. Generally, drilling fluids commonly used in drilling engineering are two systems of water-based drilling fluids or oil-based drilling fluids, and in order to overcome the problems of borehole wall instability and serious high-temperature viscosity increase of high-density oil-based drilling fluids when the existing oil-based drilling fluids are drilled into shale formations, a high-temperature-resistant high-density oil-based drilling fluid for drilling shale and a preparation method thereof are provided.
disclosure of Invention
The invention aims to provide a high-temperature-resistant high-density oil-based drilling fluid for drilling shale and a preparation method thereof, and aims to solve the problems of borehole instability and serious high-temperature tackifying of the high-density oil-based drilling fluid when the conventional oil-based drilling fluid drills into a shale stratum.
In order to achieve the purpose, the invention provides the following technical scheme: the high-temperature-resistant high-density oil-based drilling fluid for drilling shale comprises the following components:
240 portions of 0# diesel oil
2-4 parts of main emulsifier
1.5-2.5 parts of auxiliary emulsifier
2-4 parts of filtrate reducer
1-1.5 parts of organic soil
2-4 parts of lifting and cutting agent
1-2 parts of wetting agent
60 parts of 25% calcium chloride aqueous solution
Alkalinity regulator 2 parts
and 0-783 parts of barite powder.
Preferably, the fluid loss agent is prepared by reacting long-chain acrylate and acrylamide in a mass ratio of 1:3 at 70 ℃ for 6 hours by a dispersion polymerization method.
A preparation method of a high-temperature-resistant high-density oil-based drilling fluid for drilling shale comprises the following steps:
S1, taking materials: firstly, respectively weighing 2-4 parts of a main emulsifier, 1.5-2.5 parts of an auxiliary emulsifier, 2-4 parts of a cutting agent and 1-2 parts of a wetting agent, and weighing 240 parts of 0# diesel oil and 1-1.5 parts of organic soil;
S2, stirring: adding 240 parts of No. 0 diesel oil into a goblet, adding 2-4 parts of a main emulsifier, stirring for 5 minutes at a stirring speed of 10000 rpm, adding 1.5-2.5 parts of an auxiliary emulsifier at the same rotation speed, stirring for 5 minutes, adding 2-4 parts of a shear-improving agent at the same stirring speed, stirring for 5 minutes, adding 1-2 parts of a wetting agent, stirring for 10 minutes, adding 1-1.5 parts of organic soil under the stirring condition, stirring for 10 minutes, slowly adding 60 parts of a 25% calcium chloride aqueous solution, stirring for 10 minutes, sequentially adding 2-4 parts of a filtrate reducer and 2 parts of an alkalinity regulator, stirring for 20 minutes, adding 0-783 parts of barite powder, and stirring for 30 minutes at a stirring speed of 10000 rpm to prepare the high-temperature-resistant high-density oil-based drilling fluid.
Preferably, the method comprises the following steps:
S1, taking materials: firstly, respectively weighing 3 parts of a main emulsifier, 1.5 parts of an auxiliary emulsifier, 3 parts of a cutting agent and 2 parts of a wetting agent, and weighing 240 parts of 0# diesel oil and 1.5 parts of organic soil;
s2, stirring: adding 240 parts of 0# diesel oil into a goblet, adding 3 parts of main emulsifier, stirring for 5 minutes at a stirring speed of 10000 rpm, adding 1.5 parts of auxiliary emulsifier at the same rotating speed, stirring for 5 minutes, adding 3 parts of cutting agent at the same stirring speed, stirring for 5 minutes, adding 2 parts of wetting agent, stirring for 10 minutes, adding 1.5 parts of organic soil under the stirring condition, stirring for 10 minutes, slowly adding 60 parts of 25% calcium chloride aqueous solution, stirring for 10 minutes, sequentially adding 3 parts of filtrate reducer, 2 parts of alkalinity regulator, stirring for 20 minutes, adding 783 parts of barite powder, stirring for 30 minutes at a stirring speed of 10000 rpm, and thus obtaining the high-temperature-resistant high-density oil-based drilling fluid.
the invention provides a high-temperature-resistant high-density oil-based drilling fluid for drilling shale and a preparation method thereof, and the drilling fluid has the following beneficial effects:
The high-temperature-resistant high-density oil-based drilling fluid can be used for shale formations, and the oil-water ratio is 8: 2, resisting temperature of 180 ℃ and having a density of 2.2The drilling fluid has the advantages of good temperature resistance, high density, small temperature influence change of the rheological property of the drilling fluid, stable performance, wide application range, stable performance, high demulsification voltage, easy control of the rheological property of the drilling fluid under the conditions of high temperature and high density, small viscosity change of the drilling fluid under the condition of high temperature and solves the problem of high-temperature viscosity increase of asphalt filtrate reducer used by oil-based drilling fluid.
Drawings
FIG. 1 is a graph of the average kinetics of an aged precursor system of the present invention;
FIG. 2 is a graph of the mean kinetics of the system after aging at 180 ℃ in accordance with the present invention;
FIG. 3 is a graph of the average kinetics of the system of the present invention after aging at 200 ℃.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
example 1
240 parts of No. 0 diesel oil, 3 parts of a main emulsifier, 1.5 parts of an auxiliary emulsifier, 3 parts of a filtrate reducer, 1.5 parts of organic soil, 3 parts of a shear improver, 2 parts of a wetting agent, 60 parts of a 25% calcium chloride aqueous solution, 2 parts of an alkalinity regulator and 783 parts of barite powder;
The preparation method comprises the following steps: adding 240 parts of 0# diesel oil into a goblet, adding 3 parts of main emulsifier, stirring for 5 minutes at a stirring speed of 10000 rpm, adding 1.5 parts of auxiliary emulsifier at the same rotating speed, stirring for 5 minutes, adding 3 parts of cutting agent at the same stirring speed, stirring for 5 minutes, adding 2 parts of wetting agent, stirring for 10 minutes, adding 1.5 parts of organic soil under the stirring condition, stirring for 10 minutes, slowly adding 60 parts of 25% calcium chloride aqueous solution, stirring for 10 minutes, sequentially adding 3 parts of filtrate reducer, 2 parts of alkalinity regulator, stirring for 20 minutes, adding 783 parts of barite powder, stirring for 30 minutes at a stirring speed of 10000 rpm, and thus obtaining the high-temperature-resistant high-density oil-based drilling fluid.
Example 2:
high-temperature-resistant high-density oil-based drilling fluid temperature resistance evaluation experiment
The oil-based drilling fluid prepared in example 1 was hot rolled at temperatures of 120 ℃, 140 ℃, 160 ℃, 180 ℃ and 200 ℃ for 16h, and the properties of the oil-based drilling fluid were tested, and the test results are shown in table 1.
TABLE 1 System Performance at different aging temperatures
from the test results, the viscosity of the system is gradually increased along with the gradual increase of the temperature, but the rheological property is not changed greatly before and after aging, the demulsification voltage value of the system is also increased, when the aging temperature is increased to 200 ℃, the viscosity of the system is reduced compared with the viscosity after aging at 180 ℃, and meanwhile, the demulsification voltage value is reduced, so that the system is judged to resist the high temperature of 180 ℃.
example 3
Static settlement test experiment for high-temperature-resistant high-density oil-based drilling fluid
Selecting the oil-based drilling fluid prepared in the example 1, and testing the density of the prepared oil-based drilling fluid system to obtainBefore aging, pouring the prepared oil-based drilling fluid into a beaker for standing for 24 hours, respectively sampling the drilling fluid at the top and the bottom of the sample by using a needle tube for three times to measure the density of the drilling fluid, and finally taking an average value as the top and bottom densities of the sample after standing for 24 hours，(ii) a Reuse the sameThe method tests that the system is kept stand for 24 hours to get the density up and down after being aged at 180 ℃, and calculates the static settlement factor，，A value of 0.50 indicates that no static settling of the system has occurred,>0.52, which indicates poor static sedimentation stability, the test results are shown in Table 2,
TABLE 2 SF values of the system before and after aging
As can be seen from Table 2, the system sedimentation stability is reduced after aging at high temperature, but the system is stable because the SF value is still less than 0.52 after aging at 180 ℃.
Example 4
Multiple light scattering test experiment of high temperature resistant high density oil-based drilling fluid
The oil-based drilling fluid formulated in example 1 was kept on hold and the stability of the system was evaluated using a Turbiscan multiple light scattering test, which was evaluated mainly from two points:
1. And judging the stability of the system according to the average kinetic curve. When the intensity of the sample back-reflected light is not large, the back-reflected light curves of the samples are basically overlapped at different times, and the stability difference can not be clearly judged, so that the average kinetic curves of the top and the bottom of the sample after standing can be drawn, and if the system is stable, the intensity of the back-reflected light does not change along with the time, and the average kinetic curves are overlapped;
2. the Stability of the system was judged by the Stability kinetics Index TSI (Turbiscan Stability Index), and a smaller TSI value indicates a more stable system.
In the formula: h-total height of scan;
h-scanning point height;
i-number of scans;
Judging the stability of the sample by using the change of the average value kinetic curve of the top area and the bottom area of the sample, and respectively testing the change of the back scattering light intensity of the top area and the bottom area of the sample along with time, wherein the result is shown in figures 1-3;
As can be seen from the graphs in FIGS. 1 to 3, according to the average kinetic curves of the top and the bottom of the sample before and after the oil-based drilling fluid is aged, the back scattering light intensities of the top and the bottom of the sample before the oil-based drilling fluid is aged are almost consistent and do not change along with time, and the back scattering light intensities of the top and the bottom of the sample after the oil-based drilling fluid is aged at 180 ℃ change to generate a certain difference value, which indicates that the stability of the system is. However, the system has obvious sedimentation tendency as can be seen from the dynamic curve after being aged at 200 ℃. The TSI values before and after aging of the oil-based drilling fluid were calculated, and the results are shown in table 3,
TABLE 3 TSI values of oil-based drilling fluids before and after aging
As can be seen from the results in table 3, the drilling fluid stability after aging at 180 ℃ has little change compared with that before aging, and no sedimentation problem occurs, but the drilling fluid stability after aging at 200 ℃ is obviously poor, and a serious sedimentation problem occurs, so that the temperature resistance of the oil-based drilling fluid can be further judged to be 180 ℃.
Claims (4)
1. The high-temperature-resistant high-density oil-based drilling fluid for drilling shale is characterized by comprising the following components:
240 portions of 0# diesel oil
2-4 parts of main emulsifier
1.5-2.5 parts of auxiliary emulsifier
2-4 parts of filtrate reducer
1-1.5 parts of organic soil
2-4 parts of lifting and cutting agent
1-2 parts of wetting agent
60 parts of 25% calcium chloride aqueous solution
Alkalinity regulator 2 parts
And 0-783 parts of barite powder.
2. the high temperature resistant high density oil-based drilling fluid for drilling shale of claim 1, wherein: the fluid loss agent is prepared by reacting long-chain acrylate and acrylamide in a mass ratio of 1:3 for 6 hours at 70 ℃.
3. The preparation method of the high-temperature-resistant high-density oil-based drilling fluid for drilling the shale according to any one of claims 1-2, wherein the method comprises the following steps:
S1, taking materials: firstly, respectively weighing 2-4 parts of a main emulsifier, 1.5-2.5 parts of an auxiliary emulsifier, 2-4 parts of a cutting agent and 1-2 parts of a wetting agent, and weighing 240 parts of 0# diesel oil and 1-1.5 parts of organic soil;
S2, stirring: adding 240 parts of No. 0 diesel oil into a goblet, adding 2-4 parts of a main emulsifier, stirring for 5 minutes at a stirring speed of 10000 rpm, adding 1.5-2.5 parts of an auxiliary emulsifier at the same rotation speed, stirring for 5 minutes, adding 2-4 parts of a shear-improving agent at the same stirring speed, stirring for 5 minutes, adding 1-2 parts of a wetting agent, stirring for 10 minutes, adding 1-1.5 parts of organic soil under the stirring condition, stirring for 10 minutes, slowly adding 60 parts of a 25% calcium chloride aqueous solution, stirring for 10 minutes, sequentially adding 2-4 parts of a filtrate reducer and 2 parts of an alkalinity regulator, stirring for 20 minutes, adding 0-783 parts of barite powder, and stirring for 30 minutes at a stirring speed of 10000 rpm to prepare the high-temperature-resistant high-density oil-based drilling fluid.
4. The method for preparing the high-temperature-resistant high-density oil-based drilling fluid for drilling shale according to claim 3, wherein the method comprises the following steps:
s1, taking materials: firstly, respectively weighing 3 parts of a main emulsifier, 1.5 parts of an auxiliary emulsifier, 3 parts of a cutting agent and 2 parts of a wetting agent, and weighing 240 parts of 0# diesel oil and 1.5 parts of organic soil;
S2, stirring: adding 240 parts of 0# diesel oil into a goblet, adding 3 parts of main emulsifier, stirring for 5 minutes at a stirring speed of 10000 rpm, adding 1.5 parts of auxiliary emulsifier at the same rotating speed, stirring for 5 minutes, adding 3 parts of cutting agent at the same stirring speed, stirring for 5 minutes, adding 2 parts of wetting agent, stirring for 10 minutes, adding 1.5 parts of organic soil under the stirring condition, stirring for 10 minutes, slowly adding 60 parts of 25% calcium chloride aqueous solution, stirring for 10 minutes, sequentially adding 3 parts of filtrate reducer, 2 parts of alkalinity regulator, stirring for 20 minutes, adding 783 parts of barite powder, stirring for 30 minutes at a stirring speed of 10000 rpm, and thus obtaining the high-temperature-resistant high-density oil-based drilling fluid.
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| CN113861952A (en) * | 2021-11-26 | 2021-12-31 | 长江大学 | Brine-based drilling fluid and preparation method thereof |
| CN115216281A (en) * | 2022-06-30 | 2022-10-21 | 西南石油大学 | Reversible drilling fluid and preparation method and application thereof |
| CN115232606A (en) * | 2022-08-11 | 2022-10-25 | 中海石油(中国)有限公司 | Suspending agent for high-density oil-based waste liquid and preparation method thereof |
| CN115717061A (en) * | 2022-11-16 | 2023-02-28 | 延安大学 | High-temperature-resistant high-density soilless phase oil-based drilling fluid and preparation method thereof |
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| CN115216281A (en) * | 2022-06-30 | 2022-10-21 | 西南石油大学 | Reversible drilling fluid and preparation method and application thereof |
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| CN115232606A (en) * | 2022-08-11 | 2022-10-25 | 中海石油(中国)有限公司 | Suspending agent for high-density oil-based waste liquid and preparation method thereof |
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| CN115717061A (en) * | 2022-11-16 | 2023-02-28 | 延安大学 | High-temperature-resistant high-density soilless phase oil-based drilling fluid and preparation method thereof |
| CN115717061B (en) * | 2022-11-16 | 2023-10-13 | 延安大学 | High-temperature-resistant high-density soilless phase oil-based drilling fluid and preparation method thereof |
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Application publication date: 20191213 |