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Full oil base drilling fluid

A drilling fluid, all oil-based technology, applied in the field of oil drilling, can solve the problems of low ROP, increased drilling cycle and production cost, increased dynamic shear force and plastic viscosity, etc., to improve comprehensive performance, save production costs, The effect of improving the dynamic plastic ratio

Active Publication Date: 2015-07-22
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

[0004] The amount of organic soil in the existing full oil-based drilling fluid is as high as 4.0-6.0%. If the addition of too high organic soil causes the dynamic shear force and plastic viscosity of the system to rise simultaneously, the dynamic-plastic ratio will be lower than 0.25, which is not conducive to suspension Carrying cuttings and keeping the wellbore clean can easily lead to downhole accidents
In addition, the repeated cutting of cuttings near the drill bit will lead to a lower ROP, which will significantly increase the drilling cycle and production costs

Method used

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  • Full oil base drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0046]Prepare full oil-based drilling fluid according to the following proportions and the above-mentioned preparation methods:

[0047] Diesel: 100L; cetyl stearate: 2.0Kg; N-hexadecanoic acid amide: 1.0Kg; polyoxyethylene lauryl ether: 1.0Kg; ethylenediamine octadecanoic acid amide polymer: 1.0Kg; Rubber: 0.5Kg; Calcium Oxide: 2.0Kg; Organic Soil: 3.0Kg; Organic Lignite: 2.0Kg.

example 2

[0049] Prepare full oil base drilling fluid according to the following proportions:

[0050] White oil: 100L; octadecyl stearate: 2.0Kg; stearyl amide: 1.0Kg; lauryl polyoxyethylene ether: 1.0Kg; ethylenediamine stearylamide polymer: 1.0Kg; polystyrene Calcium Oxide: 2.0Kg; Organic Soil: 3.0Kg; Organic Lignite: 2.0Kg; Barite: 55Kg.

example 3

[0052] Prepare full oil base drilling fluid according to the following proportions:

[0053] Gas oil: 100Kg; cetyl stearate: 2.0Kg; octadecanoic acid amide: 1.0Kg; lauryl alcohol polyoxyethylene ether: 1.0Kg; ethylenediamine octadecanoic acid amide polymer: 1.0Kg; polyethylene Toluene: 0.3Kg; Calcium Oxide: 2.0Kg; Organic Soil: 3.0Kg; Organic Lignite: 2.0Kg; Barite: 160Kg.

[0054] The performance parameters of the full oil-based drilling fluid prepared in the above three examples are shown in Table 1

[0055] Table 1

[0056]

[0057] in:

[0058] PV: plastic viscosity; YP: dynamic shear force; YP / PV: dynamic plastic ratio; ES: demulsification voltage; FL·HTHP: high temperature and high pressure filtration loss.

[0059] The above results show that the all-oil-based drilling fluid system of the present invention has high dynamic shear force, low plastic viscosity and high dynamic-plastic ratio, and the drilling fluid has strong suspending ability and thixotropy, and can...

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Abstract

The invention discloses full oil base drilling fluid with high dynamic shear force ratio. The full oil base drilling fluid comprises base oil and other ingredients on the basis of the volume of the base oil: 1.5-2.5% of main emulsifying agent, 0.5-1.0% of auxiliary emulsifying agent, 0.8-1.0% of reverse wetting agent, 0.8-1.0% of shearing potentiator, 0.3-0.5% of thermoplastic flow type regulating agent, 2.0-3.0% of calcium oxide, 1.0-3.0% of organic soil, 1.5-2.0% of fluid loss additive and weighting material, and due to the addition amount of the weighting material, the density of the full oil base drilling fluid is 0.89-2.50g / cm<3>. The addition amount of the organic soil in the full oil base drilling fluid system is reduced by 1.0-3.0% through adding the thermoplastic fluid type regulating agent, the dynamic shear force ratio of the system is obviously improved and can achieve more than 0.45, the rheological property of the system can be improved, the comprehensive properties can be improved, and the production cost can be saved.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to an all-oil-based drilling fluid. Background technique [0002] Drilling fluid is a general term for various circulating fluids that meet the needs of drilling operations in oil and gas exploration and development. Power, acquisition of formation data, protection of oil and gas reservoirs and other functions are the main components of drilling engineering technology. [0003] Oil-based drilling fluid is an oil-based suspension or emulsion prepared by using oil as the base fluid (also known as the continuous phase) and adding emulsifiers, wetting inversion agents, lipophilic colloids, fluid loss reducers or brine, etc. . If the water content is less than 5% (some consider 10%), it is called full oil-based drilling fluid (oil-based suspension); if the water content is greater than 5%, it is called water-in-oil emulsion drilling fluid. Oil-based drilling fluid has strong inhibito...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/32
Inventor 黄达全王伟忠龚纯武郭剑梅孙双魏尽然袁明曹孜英
Owner BC P INC CHINA NAT PETROLEUM CORP
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