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A kind of calcium nitrate environment-friendly drilling fluid and preparation method thereof

A drilling fluid and calcium nitrate technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of difficulty in running 339.7mm surface casing, frequent downhole accidents, and difficulty in hole cleaning, etc. The effect of wellbore stability, formation collapse prevention and gypsum contamination resistance

Active Publication Date: 2017-04-19
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

This special wellbore structure makes it difficult to clean the wellbore, resulting in frequent downhole accidents, especially the difficulty in running the 339.7mm surface casing, and the common problem of not being able to run to the bottom
[0004] The block is located in the natural protection area of ​​the Amazon tropical rainforest, and has extremely high environmental protection requirements. The local government has specially formulated laws related to petroleum environmental protection to force the drilling cuttings and waste liquid to be discharged directly in non-toxic landfills. The discharge standards include non-toxic, low electrical conductivity, and low oil pollution Drilling fluid materials and systems have put forward higher requirements based on environmental protection. Potassium sulfate and formate environmental protection drilling fluids widely used in China cannot be used locally due to conductivity requirements.

Method used

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  • A kind of calcium nitrate environment-friendly drilling fluid and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Choose the calcium nitrate that mass percent is 3%, the xanthan gum of 0.3%, the low viscosity polyanionic cellulose of 0.5%, the sodium hydroxide of 0.1%, the preservative (formaldehyde or glutaraldehyde) of 0.03%, all the other are clear water and other raw materials,

[0028] 1) Fill the on-site slurry mixing tank with the above-mentioned clean water;

[0029] 2) Add 0.5% low-viscosity polyanionic cellulose and 0.3% xanthan gum to the clear water according to the above mass percentage, and fully stir and mix evenly;

[0030] 3) Add 3% calcium nitrate of the above-mentioned proportioning to the uniformly stirred mixture;

[0031] 4) Add 0.03% formaldehyde or glutaraldehyde in the above ratio to the mixture obtained in step 3), and stir to dissolve it;

[0032] 5) Add 0.1% sodium hydroxide in the above ratio to the mixed fluid obtained in step 4), and adjust the pH value to 7 to prepare drilling fluid.

[0033] 6) When the drilling fluid obtained in step 5) is used,...

Embodiment 2

[0041] Choose the calcium nitrate that is 5% by mass percentage, 1% xanthan gum, 1% low-viscosity polyanion cellulose, 0.3% potassium hydroxide, 0.1% formaldehyde, the rest are raw materials such as clear water,

[0042] 1) Fill the on-site slurry mixing tank with the above-mentioned clean water;

[0043] 2) Add 1% low-viscosity polyanionic cellulose and 1% xanthan gum to the clear water according to the above mass percentage, and fully stir and mix evenly;

[0044] 3) Add 5% calcium nitrate of the above-mentioned proportioning to the uniformly stirred mixture;

[0045] 4) Add 0.1% formaldehyde in the above ratio to the mixture obtained in step 3), and stir to dissolve it;

[0046] 5) Add 0.3% sodium hydroxide in the above ratio to the mixed fluid obtained in step 4), and adjust the pH value to 8.5 to prepare drilling fluid.

[0047] 6) When the drilling fluid obtained in step 5) is used, a plugging agent with a mass percentage of 0.3% is added to the obtained drilling fluid...

Embodiment 3

[0056] Choose the calcium nitrate that mass percent is 4%, the xanthan gum of 0.7%, 0.7% low-viscosity polyanionic cellulose, the potassium hydroxide of 0.2%, the formaldehyde of 0.07%, all the other are raw materials such as clear water,

[0057] 1) Fill the on-site slurry mixing tank with the above-mentioned clean water;

[0058] 2) Add 0.7% xanthan gum and 0.7% low-viscosity polyanionic cellulose to the clear water according to the above mass percentage, and fully stir and mix evenly;

[0059] 3) Add 4% calcium nitrate of the above-mentioned proportioning to the homogeneously stirred mixture;

[0060] 4) Add 0.07% glutaraldehyde in the above ratio to the mixture obtained in step 3), and stir to dissolve it;

[0061] 5) Add 0.2% sodium hydroxide in the above ratio to the mixed fluid obtained in step 4), and adjust the pH value to 7.5 to prepare drilling fluid.

[0062] 6) When the drilling fluid obtained in step 5) is used, a lost circulation agent with a mass percentage o...

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Abstract

The invention provides a calcium nitrate environment-friendly drilling fluid and a preparation method thereof. The calcium nitrate environment-friendly drilling fluid is at least prepared from the following components in percentage by mass: 3-5% of an inorganic flocculating agent, 0.3-1% of a viscosity improver, 0.5-1.0% of a filtrate reducer, 0.1-0.3% of an alkalinity controller, 0.03-0.1% of a preservative, and the balance of clear water. The drilling fluid has low viscosity and high shearing performance, good fluidity, strong gypsum pollution resistance, great solid-phase capacity, a thin and firm mud cake, easily-adjustable rheological property, moderate flocculation, stability, and an outstanding anti-sloughing effect.

Description

technical field [0001] The invention relates to a drilling fluid in oil and gas field drilling operations and a preparation method, and is a formula and a preparation method of an environmentally friendly calcium nitrate drilling fluid particularly suitable for drilling large boreholes in the surface layer of the SACHA block in Ecuador. Background technique [0002] The SACHA block in Ecuador belongs to the marine environment Cenozoic sand-mudstone deposits, and the main strata are Late Tertiary, Tertiary, and Cretaceous. Among them, the Late Tertiary and Tertiary are relatively new formations, with thick mudstone formations, long well sections, undercompaction, poor stability, strong water absorption, high dispersion, severe slurry formation, and extremely prone to wellbore There are a series of downhole complexities such as cross collapse, bit balling, resistance and jamming during tripping, and even filling or scrapping. [0003] The target formation in Ecuador is heavy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/12C09K8/16C09K8/24
CPCC09K8/10C09K8/12C09K8/206
Inventor 李宝军杨斌崔贵涛张岳荣蒋振伟苏欢郑玉辉罗勇宁小军王兆政陈灿张斌方曦
Owner BC P INC CHINA NAT PETROLEUM CORP
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