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Solid-free water-base thermal insulation packer fluid suitable for deep water

A technology without solid phase and packing fluid, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of solid phase deposition of oil-based mud, avoid damage, good environmental compatibility, and less types of raw materials Effect

Inactive Publication Date: 2015-11-11
YANGTZE UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a solid-free water-based thermal insulation packer fluid suitable for deep water. The solid-free water-based packer fluid adjusts the density of the system by adding soluble salts, and in the equilibrium annulus zone Solve the problem of solid phase deposition of oil-based mud while pressing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Solid-free water-based thermal insulation sealant fluid 1 includes 0.5% xanthan gum, 0.4% azure gum, 0.3% modified cellulose, 20% diethylene glycol, 10% polyethylene glycol 200, 0.2% Glutaraldehyde, 10% NaCl, 10% sodium formate, 0.2% dodecyl dimethyl benzyl ammonium chloride, the balance is fresh water; its density: 1.19g / cm 3 .

Embodiment 2

[0024] Solid-free water-based thermal insulation sealant fluid 2 includes 0.6% xanthan gum, 0.5% azure gum, 30% diethylene glycol, 15% NaCl, 10% potassium formate, 0.2% dodecane Dimethyl benzyl ammonium chloride, the balance is fresh water; its density: 1.20g / cm 3 .

Embodiment 3

[0026] Solid-free water-based thermal insulation sealant fluid 3 includes 0.5% xanthan gum, 0.8% guar gum, 20% diethylene glycol, 10% polyethylene glycol 400, 0.2% dodecyldimethyl Benzyl ammonium bromide, 15% NaCl, 15% NaBr, the balance is fresh water; its density: 1.23g / cm 3 .

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Abstract

The invention discloses solid-free water-base thermal insulation packer fluid suitable for deep water. The solid-free water-base thermal insulation packer fluid comprises, by weight, 0.5-1.5% of flowing deformation adjusting agent, 10-30% of polyhydric alcohol, 5-30% of soluble salt, 0.2-0.6% of bactericide and the balance water. The soluble salt is any one of or any compound of NaCl, KCl, NaBr, CaBr2, CaCl2, potassium formate and sodium formate. A solid-free water-base thermal insulation packer fluid system good in performance can be obtained through the soluble salt, and thus the problems of solid-phase sedimentation, environment pollution and the like of oil-base packer fluid are solved; due to the fact that the polyhydric alcohol is added in the system, the heat conduction coefficient of the system is decreased to be 62% that of water or even lower, and the thermal insulation effect similar to that of the oil-base thermal insulation packer fluid is achieved.

Description

technical field [0001] The invention relates to a completion fluid used in the field of petroleum drilling engineering, in particular to a solid-phase-free water-based heat-insulating and sealing fluid suitable for deep water. Background technique [0002] Thermal insulation packer fluid refers to the general term for the fluid filled between the tubing and the casing annulus to meet the thermal insulation of the tubing with multiple functions such as heat insulation. It mainly has the functions of reducing the heat loss of tubing, balancing annular pressure, and protecting the integrity of oil and gas wells. It is an important part of well completion engineering technology. In deep-water oil and gas wells, because the temperature of the tubing is much higher than that of the seawater near the seabed, a large amount of heat is lost in the tubing, resulting in a decrease in the temperature inside the tubing, the formation of natural gas hydrates, the precipitation of wax and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/40C09K8/52
CPCC09K8/40C09K8/52C09K2208/22
Inventor 许明标由福昌周姗姗
Owner YANGTZE UNIVERSITY
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