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Ultra-high density oil-based drilling fluid and preparation method thereof

An oil-based drilling fluid, ultra-high-density technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem that it is difficult to adapt to long-term drilling and completion requirements, and the drilling displacement cannot meet the requirements of purifying the wellbore. , rheology and suspension ability are difficult to coordinate and other problems, to achieve good emulsion stability, expand the range of density use, and low preparation costs.

Active Publication Date: 2016-06-01
成都西油华巍科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for a long time, ultra-high density (≥2.4g / cm 3 ) oil-based drilling fluid due to its extremely high solid content, its rheological properties and suspension capacity are difficult to coordinate, or the viscosity is too high, the flow resistance is too large, and the drilling displacement cannot meet the requirements of wellbore purification; or the viscosity is insufficient, and the weighting agent Severe subsidence at high temperature, low flow rate or static state in the well
Therefore, the ultra-high-density oil-based drilling fluids in the prior art have the problems of poor emulsification stability and rheological properties, which can easily cause the well wall to fall and collapse, and complex situations such as jamming and long drilling cycles occur, leading to failures
Therefore, ultra-high-density oil-based drilling fluids are extremely difficult to prepare and have poor stability, making it difficult to adapt to the long-term drilling and completion requirements of ultra-deep oil and gas wells and high-pressure shale gas wells

Method used

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  • Ultra-high density oil-based drilling fluid and preparation method thereof
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  • Ultra-high density oil-based drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: A density of 2.80g / cm 3 , An ultra-high density oil-based drilling fluid with an oil-water ratio of 95:5. It is prepared from the following raw materials in weight percentage, base oil: 285.0ml; emulsifier: 6.0g; wetting agent: 4.8g; organic soil: 6.0g; fluid loss agent: 12.0g; cutting agent: 0.8g ; Alkalinity regulator: 6.0g; calcium chloride aqueous solution with a mass concentration of 20%: 15.0ml; weighting agent: 1382.0g.

[0050] The preparation method includes the following steps:

[0051] a. Add the base oil to the high mixing cup, then add the emulsifier and wetting agent, and stir at a high speed of 12000r / min for 10 minutes to make the system mix evenly;

[0052] b. Under the condition of maintaining stirring, add the alkalinity regulator and calcium chloride brine into the high stirring cup, and stir at 12000r / min for 10 minutes at a high speed to mix and stir the added components evenly;

[0053] c. Under the condition of maintaining stirring, add cutti...

Embodiment 2

[0057] Example 2: A density of 2.50g / cm 3 , An ultra-high density oil-based drilling fluid with an oil-water ratio of 9:1. It is prepared from the following raw materials in weight percentage, base oil: 270ml; emulsifier: 6.0g; wetting agent: 4.8g; organic soil: 7.2g; fluid loss agent: 12.0g; cutting agent: 0.5g; Alkalinity regulator: 6.0g; calcium chloride aqueous solution with a mass concentration of 20%: 30.0ml; weighting agent: 1125.0g.

[0058] The preparation method is the same as the preparation method described in Example 1.

Embodiment 3

[0059] Example 3: A density of 2.00g / cm 3 , An ultra-high density oil-based drilling fluid with an oil-water ratio of 9:1. It is prepared from the following raw materials in weight percentage, base oil: 270ml; emulsifier: 7.2g; wetting agent: 4.2g; organic clay: 5.1g; fluid loss agent: 12.0g; alkalinity regulator: 9.0g ; Calcium chloride aqueous solution with a mass concentration of 30%: 30.0ml; plugging agent: 6.0g; weighting agent: 600.0g.

[0060] The preparation method includes the following steps:

[0061] a. Add the base oil to the high mixing cup, then add the emulsifier and wetting agent, and stir at a high speed of 12000r / min for 10 minutes to make the system mix evenly;

[0062] b. While stirring at high speed, add the alkalinity regulator and calcium chloride brine into the high stirring cup, stir at 12000r / min for 10 minutes at a high speed to mix and stir the added components evenly;

[0063] c. Under high-speed stirring, add organic soil, fluid loss agent, and plugging ...

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Abstract

The present invention discloses an ultra-high density oil-based drilling fluid and a preparation method thereof. Oil-based drilling fluids in the prior art have the problems of poor emulsion stability and rheology, and easily lead to well wall chipping and collapsing, and blocking, long drilling cycle and other complex situations can be caused. The ultra-high density oil-based drilling fluid has a density of 0.93g / cm<3> to 2.80g / cm<3>, and comprises base oil, an emulsifier, a wetting agent, a tackifier, a filtrate loss reducer, a shear strength improving agent, an alkalinity adjusting agent, an aqueous solution of calcium chloride, a blocking agent, a weighting agent and the like, a formula and the preparation method of the ultra-high density oil-based drilling fluid are improved. The ultra-high density oil-based drilling fluid has good emulsifying stability and rheology, as well as mud shale strong inhibition, has the characteristics of small dosages of a variety of treatment agents, low preparation cost, high emulsion-breaking voltage, good rheology, low fluid loss, resistance to water, soil and salt and water-based drilling fluid and strong cement paste pollution performance and the like, and can be used in special drilling work in ultra-high pressure oil and gas wells, shale gas wells and strong water sensitive formation extended reach wells, horizontal wells and the like.

Description

Technical field [0001] The invention relates to the technical field of oil-based drilling fluids for oil and natural gas and shale gas drilling engineering, in particular to an ultra-high-density oil-based drilling fluid and a preparation method thereof. Background technique [0002] At present, China's onshore and offshore oil and gas drilling and production are extending to deep (under 4500m deep), ultra-deep (under 6000m deep) and shale gas and other oil and gas fields, such as Sichuan, Xinjiang, South China Sea and other oil regions. During the drilling process, it faces technical problems of high pressure (above 70MPa) and high water sensitivity, easy to collapse mud shale. [0003] When drilling horizontal wells in the above formations to develop oil and gas, oil-based drilling fluids are required. Compared with water-based drilling fluids, oil-based drilling fluids have many advantages such as high temperature resistance, salt resistance, calcium invasion resistance, wellbo...

Claims

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Application Information

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IPC IPC(8): C09K8/32
Inventor 宋芳徐兴华
Owner 成都西油华巍科技有限公司
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