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Coal-to-liquid synthetic base drilling fluid with constant rheological property in deep water

A synthetic base and drilling fluid technology, which is applied in the petroleum industry, drilling compositions, preparation of liquid hydrocarbon mixtures, etc., can solve problems such as pressure control, achieve cost reduction, low biological toxicity, and improve working time.

Active Publication Date: 2014-08-06
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve problems such as pressure control in deepwater drilling, the present invention provides a deepwater constant rheological synthetic base drilling fluid system using coal-based oil as the base fluid

Method used

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  • Coal-to-liquid synthetic base drilling fluid with constant rheological property in deep water
  • Coal-to-liquid synthetic base drilling fluid with constant rheological property in deep water
  • Coal-to-liquid synthetic base drilling fluid with constant rheological property in deep water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The coal oil provided by Beijing Shengshi Rongzhuang Chemical Technology Research Institute is selected. Its preparation method is as follows: the raw coal is reacted with oxygen and water vapor to gasify all the coal, and the crude gas obtained is converted, desulfurized, and decarbonized into H 2Clean synthesis gas with a / CO volume ratio of 1.2~2, under the conditions of 2~5MPa, 200°C~295°C, add catalyst and its carrier, and make the synthesis reaction of the synthesis gas by Fischer-Tropsch method to generate hydrocarbons compound; then rectifying the synthesized hydrocarbon compound at 160-300°C to obtain C9-C24 normal alkanes, adding a flow regulator to the normal alkanes so that the mass fraction of the flow regulator is 2% ~5%, the coal-to-oil is obtained.

[0034] The coal-to-oil was analyzed for components, and found through analysis: the coal-to-oil used in the present invention is mainly composed of C9~C24 n-alkanes and a flow regulator, wherein the content...

Embodiment 2

[0040] a. formula: the coal-to-oil (synthetic base liquid) of embodiment 1: 70 parts by volume;

[0041] Aqueous calcium chloride solution with a mass fraction of 25%: 30 parts by volume; and

[0042] Calculate based on the total volume (100 parts) of coal-to-oil and calcium chloride aqueous solution,

[0043] The organic soil has a mass volume ratio of 2.8%, wherein the organic soil is a product formed by modifying bentonite with an alkyl quaternary ammonium salt with a long chain (C12-C30).

[0044] The emulsifier has a mass volume ratio of 3.0%, wherein the emulsifier is formed by mixing a main emulsifier and an auxiliary emulsifier in a mass ratio of 3:1. The main emulsifier is a mixture of palmitic acid and oleic acid, the condensate of EO / PO and propylene glycol, and tall oil amide in a mass ratio of 3:1:2, and the hydrophobic group of the condensate of EO / PO and propylene glycol The molecular weight of the group is 1800; tall oil amide is the product of the reaction o...

Embodiment 3

[0051] a. formula: the coal-to-oil (synthetic base liquid) of embodiment 1: 80 parts by volume;

[0052] Mass fraction is 25% calcium chloride aqueous solution: 20 parts by volume;

[0053] Calculate based on the total volume (100 parts) of coal-to-oil and calcium chloride aqueous solution,

[0054] The organic soil has a mass volume ratio of 2.5%, wherein the organic soil is a product formed by modifying bentonite with an alkyl quaternary ammonium salt with a long chain (C12-C30).

[0055] The emulsifier has a mass volume ratio of 2.8%, wherein the emulsifier is formed by mixing the main emulsifier and the auxiliary emulsifier in a mass ratio of 3:1. The main emulsifier is a mixture of palmitic acid and oleic acid, the condensate of EO / PO and propylene glycol, and tall oil amide in a mass ratio of 3:1:2, and the hydrophobic group of the condensate of EO / PO and propylene glycol The molecular weight of the group is 1800; tall oil amide is the product of the reaction of tall o...

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Abstract

The invention provides coal-to-liquid (CTL) synthetic base drilling fluid with constant rheological property in deep water. The drilling fluid comprises the following components in part by volume: 60 to 90 parts of CTL and 10 to 40 parts of aqueous solution of calcium chloride; and based on the total volume of CTL and aqueous solution of calcium chloride, the drilling fluid also comprises 2.0 to 3.5 percent mass volume of organic soil, 2 to 5 percent mass volume of emulsifier, 1.5 to 3.5 percent mass volume of calcium oxide, 0.5 to 1.5 percent mass volume of wetting agent, 1 to 4 percent mass volume of filtrate reducer and 32 to 100 percent mass volume of heavy weight additive.

Description

technical field [0001] The invention relates to a coal-to-oil deep-water constant rheology synthetic base drilling fluid. Background technique [0002] Compared with shallow water drilling, the main problems faced by deep water drilling include wellbore stability, large amount of drilling fluid, narrow pressure window for formation safe operation, wellbore cleaning, drilling fluid thickening at low temperature, shallow natural gas and gas hydrate formation, etc. problems in many ways. In consideration of smooth operation and safety, synthetic-based drilling fluid provides superior wellbore stability and maximum ROP, so deepwater and ultra-deepwater operations basically use synthetic-based drilling fluid system as the first choice. However, the rheology of traditional synthetic-based drilling fluids is greatly affected by temperature and pressure. For example, in deepwater operations in the South China Sea with a water depth of 1000m, since the mudline temperature is around ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/32C10G2/00
Inventor 罗健生李自立田荣剑耿铁刘刚温明宋鲁李怀科
Owner CHINA NAT OFFSHORE OIL CORP
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