High-temperature-resistant ultrahigh-density oil-based drilling fluid and preparation method thereof

An oil-based drilling fluid with ultra-high density technology, applied in the field of petroleum drilling engineering, to achieve the effects of small reservoir damage, good emulsification stability, and simple preparation

Inactive Publication Date: 2020-09-18
古莱特科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, for the temperature resistance > 150 ℃, density higher than 2.80g / cm 3 And there is no record of the base drilling fluid with good balanced rheology and settlement stability oil

Method used

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  • High-temperature-resistant ultrahigh-density oil-based drilling fluid and preparation method thereof
  • High-temperature-resistant ultrahigh-density oil-based drilling fluid and preparation method thereof
  • High-temperature-resistant ultrahigh-density oil-based drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This embodiment provides a density of 2.4g / cm 3 High temperature resistant ultra-high density oil-based drilling fluid, including the following components:

[0050] The water-in-oil base liquid is composed of No. 0 diesel oil and a 25% calcium chloride aqueous solution with a volume ratio of 85:15;

[0051] Calculated per 100mL of water-in-oil base fluid, the addition amount of other components is:

[0052] PF-MOMUL 0.8g, PF-MOCOAT 1g, PF-MOWET-260 1g, modified asphalt 5g, calcium oxide 3g, organic bentonite 1.5g, barite 192g, micromanganese powder Micromax 128g.

[0053] The preparation method of the above-mentioned high-temperature-resistant ultra-high-density oil-based drilling fluid comprises the following steps:

[0054]A. Measure 255mL No. 0 diesel oil with a measuring cylinder, pour it into a high-speed mixing cup, add PF-MOMUL 2.4g, PF-MOCOAT 3g, PF-MOWET-260 3g, and stir for 4 minutes;

[0055] B. Add 45 mL of 25% calcium chloride aqueous solution and stir f...

Embodiment 2

[0060] This embodiment provides a density of 2.6g / cm 3 High temperature resistant ultra-high density oil-based drilling fluid, including the following components:

[0061] Water-in-oil base fluid, including No. 0 diesel oil with a volume ratio of 90:10 and a calcium chloride aqueous solution with a concentration of 25%;

[0062] Calculated per 100mL of water-in-oil base fluid, the addition amount of other components is:

[0063] PF-MOMUL 0.8g, PF-MOCOAT 1g, PF-MOWET-260 2g, humic acid amide 5g, calcium oxide 2g, organic bentonite 1g, barite 234g, micromanganese powder Micromax 156g.

[0064] The preparation method of the above-mentioned high-temperature-resistant ultra-high-density oil-based drilling fluid comprises the following steps:

[0065] A. Measure 270mL No. 0 diesel oil with a measuring cylinder, pour it into a high-speed mixing cup, add PF-MOMUL 2.4g, PF-MOCOAT 3g, PF-MOWET-260 6g, and stir for 5 minutes;

[0066] B. Add 30 mL of 25% calcium chloride aqueous solut...

Embodiment 3

[0071] This embodiment provides a density of 2.8g / cm 3 High temperature resistant ultra-high density oil-based drilling fluid, including the following components:

[0072] Water-in-oil base fluid, including No. 0 diesel oil with a volume ratio of 90:10 and a calcium chloride aqueous solution with a concentration of 25%;

[0073] Calculated per 100mL of water-in-oil base fluid, the addition amount of other components is:

[0074] PF-MOMUL 1g, PF-MOCOAT 1g, PF-MOWET-260 2g, modified asphalt 6g, calcium oxide 3g, organic bentonite 0.3g, barite 291g, micromanganese powder Micromax 194g.

[0075] The preparation method of the above-mentioned high-temperature-resistant ultra-high-density oil-based drilling fluid comprises the following steps:

[0076] A. Measure 270mL No. 0 diesel oil with a measuring cylinder, pour it into a high-speed mixing cup, add PF-MOMUL 3g, PF-MOCOAT 3g, PF-MOWET-260 6g, and stir for 6 minutes;

[0077] B. Add 30mL of 25% calcium chloride aqueous solution...

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Abstract

The invention provides a high-temperature-resistant ultrahigh-density oil-based drilling fluid which comprises the following components: a water-in-oil base fluid, a main emulsifier, an auxiliary emulsifier, a filtrate reducer, an alkalinity regulator, organic soil, a wetting agent and a weighting agent, and the weighting agent comprises barite and micro-manganese powder Micromax. In addition, theinvention further provides a preparation method of the high-temperature-resistant ultrahigh-density oil-based drilling fluid. According to the high-temperature-resistant ultrahigh-density oil-based drilling fluid and the preparation method thereof provided by the invention, the high-temperature-resistant ultrahigh-density oil-based drilling fluid with the highest density of 3.0g / cm<3>, the high-temperature and high-pressure filtration loss of less than or equal to 6mL, the plastic viscosity PV of less than or equal to 71mPa. S, the dynamic shear force YP of less than or equal to 32Pa and thedynamic settling density difference Rho of less than or equal to 0.05g / cm<3> is provided, the viscous shear value is within a reasonable range, the rheological property is good, and the drilling requirements of three-high wells can be met.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling engineering, in particular to drilling fluid and a preparation method thereof. Background technique [0002] With the further development of exploration and development technology, the drilling of ultra-deep, ultra-high temperature, and ultra-high pressure "three super wells" is increasing. Due to high formation pressure and high downhole temperature (180-200°C), the drilling process faces technical difficulties such as high pressure (higher than 70MPa) and high water sensitivity, easily collapsed mud shale, and easily creeping salt-gypsum layers. For the above formations, oil-based drilling fluid is the main technical solution. Compared with water-based drilling fluid, it has high temperature resistance, salt resistance, calcium intrusion resistance, good borehole wall stability, good lubricity and less damage to oil and gas layers. And many other advantages. [0003] When dealing wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/36
CPCC09K8/36
Inventor 王威徐同台武星星黄献西卢书义
Owner 古莱特科技股份有限公司
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