CN110951469A - Enhanced heat transfer type oil-based drilling fluid, drilling fluid base fluid and preparation method thereof - Google Patents
Enhanced heat transfer type oil-based drilling fluid, drilling fluid base fluid and preparation method thereof Download PDFInfo
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- 239000011780 sodium chloride Substances 0.000 claims abstract description 4
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- 239000010439 graphite Substances 0.000 claims description 14
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- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 13
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 13
- 239000005642 Oleic acid Substances 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 13
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 8
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 7
- 239000005751 Copper oxide Substances 0.000 claims description 7
- 229910000431 copper oxide Inorganic materials 0.000 claims description 7
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 6
- 150000001346 alkyl aryl ethers Chemical class 0.000 claims description 6
- -1 polyoxyethylene Polymers 0.000 claims description 6
- 239000012267 brine Substances 0.000 claims description 5
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 5
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 5
- 235000021355 Stearic acid Nutrition 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 4
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 4
- 239000008117 stearic acid Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 3
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 7
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- 239000007789 gas Substances 0.000 description 12
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002114 nanocomposite Substances 0.000 description 2
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- 238000005728 strengthening Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
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- 230000005764 inhibitory process Effects 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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- 239000003345 natural gas Substances 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
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- 239000004408 titanium dioxide Substances 0.000 description 1
Classifications
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
The invention discloses an enhanced heat transfer type oil-based drilling fluid, a drilling fluid base fluid and a preparation method thereof, wherein the oil-based drilling fluid base fluid consists of the following components in parts by weight: 100 parts of white oil, 0.4-2 parts of nano particles and 0.3-1 part of surfactant; taking an oil-based drilling fluid base fluid, adding calcium naphthenate and sorbitan monooleate, and mechanically stirring until all the oil-soluble components are dissolved; adding CaCl2Slowly adding saline water into the prepared oil phase, and fully stirring to prepare stable emulsion; then continuously stirring, adding organic soil, oxidized asphalt and calcium oxide powder, and stirring to completely dissolve all the components; and adding barite for regulation according to the density of the required drilling fluid, and finally fully stirring to obtain the enhanced heat transfer type oil-based drilling fluid. The base fluid is used for preparing the oil-based drilling fluid, so that the thermophysical property parameters of the oil-based drilling fluid are improved, and the problem of overhigh temperature of the drilling fluid in the current drilling process is solved.
Description
Technical Field
The invention relates to a heat transfer enhanced oil-based drilling fluid, a drilling fluid base fluid and a preparation method thereof, belongs to the technical field of petroleum and natural gas drilling, and particularly relates to exploitation of deep-well and ultra-deep-well with high temperature such as deep shale gas.
Background
With the continuous development of the oil industry, more and more conventional oil and gas resources are exploited in large quantities, and various large oil and gas companies aim at the conventional oil and gas resources, wherein the oil and gas resources have the characteristics of complex reservoir geological structure, high exploitation difficulty, high development cost and the like. In unconventional oil and gas resources, the development of the shale gas has obvious realities, the shale gas resource reserves in China are huge, and the shale gas resource reserves have wide exploration and development prospects. At present, a great problem faced by shale gas exploitation is that due to complex reservoir conditions, a large amount of heat is generated in a long-time drilling process. The traditional oil-based drilling fluid cannot transfer heat in time due to weak heat transfer capacity, the drilling fluid cannot well cool and wet a drill bit, and even various guide instruments can be damaged by long-time drilling work, so that the working efficiency is reduced.
The drilling fluid is known as blood in the drilling process and plays a great role in the drilling process. The drilling fluid mainly comprises an oil-based drilling fluid and a water-based drilling fluid, and compared with the water-based drilling fluid, the oil-based drilling fluid has obvious advantages in the aspects of well wall stability, lubrication and blockage prevention, inhibition of hydration and expansion of shale and rapid drilling, and is widely used as an important means for drilling unconventional oil and gas resources such as deep wells, ultra-deep wells, horizontal wells, shale gas and the like. During the drilling process, the drilling fluid enters the drill rod through ground equipment, flows out of a drill bit water hole and returns upwards through the annular space, and during the process, the drilling fluid and parts such as a well wall stratum, a drill string and a casing pipe generate a complex heat exchange process. At present, the problem of overhigh temperature of the drilling fluid is mainly solved by adding a ground cooling device, increasing the circulation time, adding a pipeline cooling device and intermittently drilling. Such solutions only address the problem surface, some of which are costly and have limited success.
Oil-based drilling fluids have a poor heat transfer capability compared to water-based drilling fluids, and prolonged drilling operations can result in rapid increases in bottom hole temperatures. The conventional oil-based drilling fluid has poor heat transfer efficiency, so that the conventional oil-based drilling fluid has poor heat exchange capacity and cannot timely reduce the temperature at the bottom of a well, and the working efficiency of a well site is reduced.
Disclosure of Invention
Aiming at the problems, the invention mainly overcomes the defects in the prior art and provides the heat transfer enhancement type oil-based drilling fluid, the drilling fluid base fluid and the preparation method thereof.
The drilling fluid improves the thermophysical property constant of the drilling fluid by adding the nano composite material into the base fluid of the oil-based drilling fluid, and the addition of a small amount of nano material does not have great influence on the performance of the drilling fluid. In addition, the addition of a small amount of nano materials can also improve the rheological property of the drilling fluid, reduce the friction resistance and enhance the quality of mud cakes.
The technical scheme provided by the invention for solving the technical problems is as follows: the heat transfer enhancement type base fluid for the oil-based drilling fluid comprises the following components in parts by weight: 100 parts of white oil, 0.4-2 parts of nano particles and 0.3-1 part of surfactant.
The further technical scheme is that the composition comprises the following components in parts by weight: 100 parts of white oil, 0.4-1 part of nano particles and 0.3-0.6 part of surfactant.
The further technical scheme is that the nano particles are any one or more of nano aluminum oxide, nano titanium dioxide, nano graphite, nano copper oxide and nano silicon dioxide.
The further technical proposal is that the nano-particles are nano-alumina or nano-titanium dioxide, and the particle size is 20nm to 100 nm.
The further technical scheme is that the surfactant is any one or more of oleic acid, sodium dodecyl benzene sulfonate, polyoxyethylene alkyl aryl ether, stearic acid and sorbitan monooleate.
A preparation method of a heat transfer enhancement type oil-based drilling fluid base fluid comprises the following steps:
s1, putting 100 parts of white oil in a beaker, adding 0.4-2 parts of nanoparticles, and mechanically stirring for 15min at the rotating speed of 1000 r/min;
step S2, adding 0.3-1 part of surfactant, and mechanically stirring for 20min at the rotating speed of 1000 r/min;
and step S3, performing ultrasonic dispersion with frequency of 40KHz and power of 360w for 30min by using an ultrasonic cleaning machine.
The heat transfer enhancement type oil-based drilling fluid is prepared from the following components in parts by weight based on 100 parts by weight of drilling fluid: 60-90 parts of oil-based drilling fluid base fluid, 1-2 parts of calcium naphthenate, 1-2 parts of sorbitan monooleate and CaCl210-40 parts of brine, 0.5-3 parts of oxidized asphalt, 0.5-3 parts of calcium oxide powder and 2-5 parts of organic soil.
The further technical proposal is that the CaCl is2The brine concentration was 25%.
A preparation method of the enhanced heat transfer type oil-based drilling fluid comprises the following steps:
(1) taking 60-90 parts of oil-based drilling fluid base fluid, adding 1-2 parts of calcium naphthenate and 1-2 parts of sorbitan monooleate, and mechanically stirring until all the oil-soluble components are dissolved;
(2) adding 10-90 parts of CaCl2Slowly adding saline water into the oil phase prepared in the step (1), and fully stirring to prepare stable emulsion;
(3) continuously stirring, and adding 2-5 parts of organic soil, 0.5-3 parts of oxidized asphalt and 0.5-3 parts of calcium oxide powder for mechanical stirring;
(4) and adding barite for regulation according to the density of the required drilling fluid, and finally fully stirring to obtain the enhanced heat transfer type oil-based drilling fluid.
The further technical scheme is that the stirring time in the step (1) is 1h, the rotating speed is 1000r/min, the stirring time in the step (3) is 40min, and the rotating speed is 1000r/min
The invention has the following beneficial effects:
(1) the heat conduction efficiency of the drilling fluid can be greatly improved by adding a small amount of nano particles, and the nano materials are low in price, namely alumina, copper oxide, silicon dioxide, titanium dioxide and graphite, and the addition is only 0.4-2%, so that the cost is reduced to a great extent;
(2) the invention adds a plurality of surfactants to modify the surface of the nano-particles, thereby preparing the oleophylic and hydrophilic nano-composite material. The effect of surfactants on nanoparticles includes two aspects: first, the particles are coated with a surfactant. On the surface of the nano-particles, a ring structure or a long-chain branch in the surfactant can play a role in increasing steric hindrance and strengthening the dispersion of the nano-particles; secondly, forming an electric double layer, selecting a proper surfactant to enable the surface of the nano particles to adsorb ions to form the electric double layer, greatly reducing the attraction among the particles through the repulsion of the electric double layer, and reducing the agglomeration degree of the particles so as to realize the purpose of strengthening the stable dispersion of the nano particles;
(3) the thermal physical property parameters of the oil-based drilling fluid are improved by improving the base fluid of the oil-based drilling fluid, so that the nano particles of the oil-based drilling fluid are prevented from being incapable of being fully dispersed in the drilling fluid;
(4) compared with the traditional method for reducing the temperature of the well bottom by using an external means, the method starts from the drilling fluid, effectively improves the heat conduction efficiency of the drilling fluid and reduces the temperature of the well bottom while reducing manpower and material resources, and is also favorable for improving the lubricity, rheological property and filtration loss reduction of the drilling fluid due to the addition of a small amount of nano materials.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The invention relates to a heat transfer enhancement type base fluid of an oil-based drilling fluid, which is prepared by the following steps:
putting 100 parts of white oil in a beaker, adding 0.4 part of nano graphite with the particle size of 30nm, and mechanically stirring for 15min at the rotating speed of 1000 r/min; then adding 0.3 part of oleic acid, and mechanically stirring for 20min at the rotating speed of 1000 r/min; ultrasonic dispersion was carried out for 30min at a frequency of 40KHz and a power of 360w using an ultrasonic cleaner.
Example 2
The enhanced heat transfer type oil-based drilling fluid base fluid is prepared according to the same steps as in example 1, and is different from the example 1 in that the addition amount of the nano graphite is changed into 1 part.
Example 3
The heat transfer enhancement type base fluid for the oil-based drilling fluid is prepared according to the same steps as in example 1, and is different from the base fluid in example 1 in that the addition amount of 0.3 part of sorbitan monooleate is changed from oleic acid.
Example 4
The enhanced heat transfer type oil-based drilling fluid base fluid is prepared according to the same steps as in example 1, and is different from the base fluid in example 1 in that the addition amount of nano graphite is 0.6 parts, and the addition amount of oleic acid is changed into sorbitan monooleate, and is 0.3 part.
Example 5
The enhanced heat transfer type oil-based drilling fluid base fluid is prepared according to the same steps as the example 1, and is different from the example 1 in that nano graphite is changed into nano alumina, the particle size is 20nm, and the addition amount is 0.4 part; the oleic acid is changed into polyoxyethylene alkyl aryl ether, and the addition amount is 0.3 part.
Example 6
The heat transfer enhancement type base fluid for the oil-based drilling fluid is prepared according to the same steps as the example 1, and is different from the example 1 in that nano graphite is changed into nano alumina, the addition is 0.8 part, and oleic acid is changed into polyoxyethylene alkyl aryl ether, and the addition is 0.3 part.
Example 7
The heat transfer enhancement type base fluid for the oil-based drilling fluid is prepared according to the same steps as in example 1, and is different from the base fluid in example 1 in that nano graphite is changed into nano copper oxide, the addition amount of the nano copper oxide is 0.4 part, the particle size of the nano copper oxide is 20nm, oleic acid is changed into stearic acid, and the addition amount of the oleic acid is 0.3 part.
Example 8
The heat transfer enhancement type base fluid for the oil-based drilling fluid is prepared according to the same steps as in example 1, and is different from the base fluid in example 1 in that nano graphite is changed into nano copper oxide, the particle size is 20nm, the addition amount is 0.8 part, and oleic acid is changed into stearic acid, and the addition amount is 0.4 part.
Example 9 a heat transfer enhancement type base fluid for an oil-based drilling fluid of the present invention was prepared by the same procedure as in example 1, except that nano-graphite was changed to nano-silica having a particle size of 20nm and the amount added was 0.4 part, unlike example 1.
Example 10
The heat transfer enhancement type base fluid for the oil-based drilling fluid is prepared according to the same steps as in example 1, and is different from the base fluid in example 1 in that nano graphite is changed into nano silicon dioxide, the particle size of the nano silicon dioxide is 20nm, the addition amount of the nano silicon dioxide is 0.8 part, and oleic acid is changed into sodium dodecyl benzene sulfonate, and the addition amount of the sodium dodecyl benzene sulfonate is 0.4 part.
Example 11
The enhanced heat transfer type base fluid for the oil-based drilling fluid is prepared according to the same steps as in example 1, and is different from example 1 in that nano graphite is changed into nano titanium dioxide, the particle size is 20nm, and the addition amount is 0.4 part. The oleic acid is changed into sodium dodecyl benzene sulfonate, and the addition amount is 0.3 part.
Example 12
The heat transfer enhancement type base fluid for the oil-based drilling fluid is prepared according to the same steps as in example 1, and is different from the base fluid in example 1 in that nano graphite is changed into nano titanium dioxide, the particle size of the nano titanium dioxide is 20nm, the addition amount of the nano titanium dioxide is 0.8 part, and oleic acid is changed into polyoxyethylene alkyl aryl ether, and the addition amount of the polyoxyethylene alkyl aryl ether is 0.4 part.
Comparative example 1
This example illustrates a conventional oil-based drilling fluid base fluid.
100mL of white oil was placed in a beaker and the thermophysical parameters were measured.
The density is measured by using a float type densimeter, and finally the thermal conductivity and specific heat capacity of the samples of examples 1-12 and comparative example 1 are measured by an instantaneous line steady state method, and the test results are shown in table 1; the instrument is a DRE series thermal conductivity coefficient tester produced by Hunan Tan instruments Ltd.
The invention relates to an enhanced heat transfer type oil-based drilling fluid which comprises the following steps:
taking 100 parts by weight of drilling fluid as a reference, taking 60-90 parts of the oil-based drilling fluid base fluid prepared in the examples 1-12, adding 1-2 parts of calcium naphthenate and 1-2 parts of sorbitan monooleate, and mechanically stirring for 1h at the rotating speed of 1000r/min until all the used oil-soluble components are dissolved;
10-40 parts of CaCl with the concentration of 25%2Slowly adding saline water into the prepared oil phase, and fully stirring; then, continuously stirring, adding 2-5 parts of organic soil, 0.5-3 parts of oxidized asphalt and 0.5-3 parts of calcium oxide powder, and mechanically stirring for 40min at the rotating speed of 1000r/min to fully disperse all the components;
according to the density of the required drilling fluid, a proper amount of barite is added for regulation, and finally, the drilling fluid is fully stirred to obtain 12 parts of different enhanced heat transfer type oil-based drilling fluids, and thermophysical property parameters of the drilling fluids are respectively measured and are shown in table 2.
Comparative example 2
This example illustrates a conventional oil-based drilling fluid and its method of deployment
Taking 60-90 parts of white oil based on 100 parts of drilling fluid by weight, adding 1-2 parts of calcium naphthenate and 1-2 parts of sorbitan monooleate, and mechanically stirring for 1 hour at the rotating speed of 1000r/min until all the oil-soluble components are dissolved;
adding 10-40 parts of CaCl2Brine is slowly added to the oil phase just prepared in step and stirred well; then, continuously stirring, adding 2-5 parts of organic soil, 0.5-3 parts of oxidized asphalt and 0.5-3 parts of calcium oxide powder, and mechanically stirring for 40min at the rotating speed of 1000r/min to fully disperse all the components;
and adding a proper amount of barite for regulation according to the density of the required drilling fluid, and finally fully stirring to obtain the enhanced heat transfer type oil-based drilling fluid. The measured thermophysical parameters are shown in Table 2.
The specific heat conductivity coefficient test method comprises the following steps:
(1) pouring the prepared enhanced heat transfer type oil-based drilling fluid into a 100mL graduated scale in a 100mL graduated cylinder, slightly putting a densimeter into the fluid after bubbles are eliminated, (loosening hands immediately after the measuring cylinder cannot be put in the fluid and preventing the densimeter from being damaged by touching the bottom), and reading, wherein when reading, eyes look at the meniscus level and the density of the drilling fluid is read by taking a scribed line at the lower part of the meniscus as the standard;
(2) pouring the drilling fluid into a 100mL beaker, inserting a sensor chip of a thermal conductivity tester into the drilling fluid, opening the tester, selecting a new experiment, inputting the density tested in the step (1), selecting 0.5A of input current, and testing after the temperature of the drilling fluid is stable;
(3) data are read from a computer, measurement is repeated three times, and the average values of the thermal conductivity, the specific heat capacity and the thermal diffusivity are calculated.
TABLE 1 enhanced heat transfer type oil-based drilling fluid base fluid thermophysical property parameter table
TABLE 2 enhanced heat transfer type oil-based drilling fluid thermophysical property parameter table
As can be seen from the data in tables 1 and 2 above:
after the heat conductivity coefficient and the specific heat capacity of the base fluid of the enhanced heat transfer type oil-based drilling fluid are measured, the heat conductivity coefficient and the specific heat capacity of the base fluid are obviously improved, and the heat diffusion coefficient calculated by a formula is also greatly improved. Compared with the traditional oil-based drilling fluid, the heat conductivity coefficient, the specific heat capacity and the thermal diffusion coefficient of the enhanced heat transfer oil-based drilling fluid prepared by using the base fluid are greatly improved.
Therefore, the enhanced heat transfer type oil-based drilling fluid can effectively improve the thermophysical parameters of the oil-based drilling fluid, so that the purpose of reducing the bottom hole temperature is achieved.
As can be seen from the data of the drilling fluid base fluid in the examples 1-12 in the table 1, compared with the data in the comparative example 1, the thermal physical property parameters of the enhanced heat transfer type oil-based drilling fluid base fluid are greatly improved, the thermal conductivity coefficient is improved by 53 percent at most, the specific heat capacity is improved by 37 percent at most, and the thermal diffusion coefficient is improved by 23 percent at most.
Compared with the drilling fluid of the comparative example 2, the drilling fluid prepared in the examples 1-12 in the table 2 has the advantages that the drilling fluid thermal property parameters are improved, the thermal conductivity coefficient is improved by 44.2% to the maximum, the specific heat capacity is improved by 31% to the maximum, and the thermal diffusion coefficient is improved by 19% to the maximum, which shows that the heat transfer performance of the drilling fluid can be improved by using the enhanced heat transfer type oil-based drilling fluid prepared by using the enhanced heat transfer type oil-based drilling fluid base fluid.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (10)
1. The enhanced heat transfer type base fluid for the oil-based drilling fluid is characterized by comprising the following components in parts by weight: 100 parts of white oil, 0.4-2 parts of nano particles and 0.3-1 part of surfactant.
2. The enhanced heat transfer oil-based drilling fluid base fluid is characterized by comprising the following components in parts by weight: 100 parts of white oil, 0.4-1 part of nano particles and 0.3-0.6 part of surfactant.
3. The enhanced heat transfer oil-based drilling fluid base fluid as claimed in claim 2, wherein the nanoparticles are any one or more of nano alumina, nano titania, nano graphite, nano copper oxide and nano silica.
4. The enhanced heat transfer oil-based drilling fluid base fluid according to claim 3, wherein the nano particles are nano aluminum oxide or nano titanium dioxide, and the particle size of the nano aluminum oxide or nano titanium dioxide is 20 nm-100 nm.
5. The enhanced heat transfer oil-based drilling fluid base fluid according to claim 2, wherein the surfactant is any one or more of oleic acid, sodium dodecylbenzene sulfonate, polyoxyethylene alkyl aryl ether, stearic acid and sorbitan monooleate.
6. The preparation method of the enhanced heat transfer oil-based drilling fluid base fluid as claimed in any one of claims 1 to 5, characterized by comprising the following steps:
s1, putting 100 parts of white oil in a beaker, adding 0.4-2 parts of nanoparticles, and mechanically stirring for 15min at the rotating speed of 1000 r/min;
step S2, adding 0.3-1 part of surfactant, and mechanically stirring for 20min at the rotating speed of 1000 r/min;
and step S3, performing ultrasonic dispersion with frequency of 40KHz and power of 360w for 30min by using an ultrasonic cleaning machine.
7. The heat transfer enhancement type oil-based drilling fluid is characterized by comprising the following components in parts by weight based on 100 parts by weight of the drilling fluid: the oil-based drilling fluid base fluid of any one of claims 1 to 5, 60 to 90 parts, 1 to 2 parts of calcium naphthenate, 1 to 2 parts of sorbitan monooleate, CaCl210-40 parts of brine, 0.5-3 parts of oxidized asphalt, 0.5-3 parts of calcium oxide powder and 2-5 parts of organic soil.
8. The enhanced heat transfer oil-based drilling fluid of claim 7, wherein the CaCl is2The brine concentration was 25%.
9. The preparation method of the enhanced heat transfer type oil-based drilling fluid is characterized by comprising the following steps of:
(1) taking 60-90 parts of the oil-based drilling fluid base fluid of any one of claims 1-5, adding 1-2 parts of calcium naphthenate and 1-2 parts of sorbitan monooleate, and mechanically stirring until all the oil-soluble components are dissolved;
(2) adding 10-40 parts of CaCl2Slowly adding saline water into the oil phase prepared in the step (1), and fully stirring to prepare stable emulsion;
(3) continuously stirring, adding 2-5 parts of organic soil, 0.5-3 parts of oxidized asphalt and 0.5-3 parts of calcium oxide powder, and mechanically stirring;
(4) and adding barite for regulation according to the density of the required drilling fluid, and finally fully stirring to obtain the enhanced heat transfer type oil-based drilling fluid.
10. The preparation method of the enhanced heat transfer oil-based drilling fluid, according to claim 9, wherein the stirring time in the step (1) is 1h and the rotation speed is 1000r/min, and the stirring time in the step (3) is 40min and the rotation speed is 1000 r/min.
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| US20120015852A1 (en) * | 2010-06-28 | 2012-01-19 | Baker Hughes Incorporated | Nanofluids and Methods of Use for Drilling and Completion Fluids |
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