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Diesel oil-based drilling fluid with high saline water pollution resistance and preparation method thereof

A diesel-based drilling fluid and brine technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of HTHP large water loss, poor rheological control, poor fluidity of drilling fluid, etc., to reduce labor intensity, Good emulsification stability, the effect of reducing solid phase content

Inactive Publication Date: 2021-03-19
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oil-based drilling fluid system used by companies such as Halliburton and MI SWACO in northern Pakistan has a density of more than 2.00g / cm 3 Finally, the performance of drilling fluid is poor, which is characterized by high dynamic shear force, poor fluidity of drilling fluid, large HTHP water loss, and demulsification voltage value lower than 1200V, which cannot meet the needs of safe drilling downhole.
[0004] Summarizing and analyzing the existing technology, there are still the following problems: (1) Poor rheological control, manifested in high dynamic shear force, high initial shear force and final shear force at high density; (2) Poor high temperature stability, manifested in After high temperature and high pressure, the water loss is large under high temperature and high pressure, and the demulsification voltage value drops rapidly; (3) The anti-pollution ability is poor, which is manifested in the deterioration of the rheology of the system after the intrusion of salt water and gypsum, and the demulsification voltage value drops rapidly

Method used

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  • Diesel oil-based drilling fluid with high saline water pollution resistance and preparation method thereof
  • Diesel oil-based drilling fluid with high saline water pollution resistance and preparation method thereof

Examples

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Embodiment 1

[0030] As the best embodiment of the present invention, diesel oil, composite emulsifier, calcium chloride brine, calcium oxide, organic bentonite, high temperature resistant fluid loss reducer, and density regulator are prepared in parts by weight, and the components are in parts by weight The ratio is 25:2:4:1.7:1.5:2.5:64.3. A preparation method of high resistance to salt water pollution diesel base drilling fluid, comprising the following steps:

[0031] Step 1: Put 25 parts of diesel oil into a high stirring cup, add 2 parts of compound emulsifier, and stir at high speed for 10 minutes at a speed of 12000r / min.

[0032] Step 2: Add 4 parts of calcium chloride brine, and perform high-speed stirring for 10 minutes at a speed of 12000 r / min.

[0033] Step 3: Add 1.7 parts of calcium oxide powder, and perform high-speed stirring for 10 minutes at a speed of 12000 r / min.

[0034] Step 4: Add 1.5 parts of organic bentonite, and perform high-speed stirring for 20 minutes at a ...

Embodiment 2

[0038] As the best implementation mode of the present invention, a preparation method of diesel-based drilling fluid with high resistance to salt water pollution is configured according to the same steps as in Example 1, and the difference from Example 1 is that the addition amount of the composite emulsifier is changed to 1.5 parts.

Embodiment 3

[0040] As the best implementation mode of the present invention, a preparation method of diesel-based drilling fluid with high resistance to salt water pollution is configured according to the same steps as in Example 1, and the difference from Example 1 is that the amount of calcium chloride brine is changed to 3.5 parts .

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Abstract

The invention discloses a diesel oil-based drilling fluid with high saline water pollution resistance, which relates to the technical field of petroleum drilling engineering and comprises diesel oil,a compound emulsifier, calcium chloride saline water, calcium oxide, organic bentonite and a high-temperature-resistant filtrate reducer. wherein the weight ratio of the diesel oil to the compound emulsifier to the calcium chloride saline water to the calcium oxide to the organic bentonite to the high-temperature-resistant filtrate reducer is (20-25):(1-2):(3-4):(1-2): (1-2): (2.5-4). The diesel oil-based drilling fluid is simple in formula and convenient to prepare on site, and has the characteristics of strong saline water pollution resistance, good flowing property, good emulsifying stability, high demulsifying voltage value and good high-temperature stability.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling engineering, in particular to a diesel-based drilling fluid system highly resistant to salt water pollution and a preparation method thereof, which is particularly suitable for drilling salt rock gypsum formations. Background technique [0002] The northern part of Pakistan is mostly a piedmont structure, and high-pressure saline layers, salt rocks, and gypsum formations are common, and there are many faults, repeated formation reversals, and complex formation pressure systems. Western companies generally use diesel-based drilling fluids for drilling. Due to the intrusion and pollution of formation brine, high-density oil-based drilling fluids have poor anti-pollution ability, high viscosity and shear, and difficulty in fluidity control. At the same time, the bottom hole temperature is as high as 175°C, resulting in oil-based mud emulsification. Instability will further deteriorate the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32
CPCC09K8/32
Inventor 黎凌吉永忠李巍杨刚程文博丁振龙李林侦马里任浩
Owner BC P INC CHINA NAT PETROLEUM CORP
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