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Sodium silicate containing polyalcohol drilling fluid for offshore drilling

A technology for marine drilling and sodium silicate, applied in the field of drilling fluid, can solve the problems of large amount of drilling fluid, poor rheology of drilling fluid, and difficulty in mixing of bentonite, so as to save drilling cost, good rheology, and high inhibition. Effect

Inactive Publication Date: 2016-02-17
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous development of oil and gas reservoirs on land and in the sea, looking at the research, development and application of drilling fluids at home and abroad for decades, it can be found that the main problems faced by offshore drilling fluids are: the high salinity of seawater makes it difficult for bentonite to dissolve in seawater Medium mixing slurry; hydration and dispersion of fine solid particles leads to large amount of drilling fluid; poor rheology of drilling fluid makes wellbore cleaning difficult, and hydration of rock particles leads to instability of wellbore

Method used

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  • Sodium silicate containing polyalcohol drilling fluid for offshore drilling
  • Sodium silicate containing polyalcohol drilling fluid for offshore drilling
  • Sodium silicate containing polyalcohol drilling fluid for offshore drilling

Examples

Experimental program
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Effect test

Embodiment 1

[0016] 1. A preparation method and basic rheological parameter measurement of sodium silicate polyalcohol drilling fluid for ocean drilling.

[0017] (1) Its preparation method is as follows:

[0018] This drilling fluid comprises seawater, bentonite, sodium carbonate, viscosifier, fluid loss reducer and inhibitor, and its weight and number ratio is, 400mL seawater: bentonite: sodium carbonate: viscosity increaser: fluid loss reducer: inhibitor= 100:5:5:0.4:0.7:8.

[0019] 1) Firstly, according to the above-mentioned ratio, weigh an appropriate amount of seawater, bentonite, viscosifier, fluid loss control agent, inhibitor and auxiliary agent.

[0020] 2) Add 400ml seawater into the container, and then add 5% bentonite, 5% Na 2 CO 3 , 0.4% PAC142, 0.7% lignite resin, 3% sodium silicate, NaOH to adjust the pH to 12, 5% polyethylene glycol, and fully stir to obtain sodium silicate polyalcohol drilling fluid.

[0021] (2) Measurement of basic rheological parameters.

[0022]...

Embodiment 2

[0037] This drilling fluid comprises seawater, bentonite, sodium carbonate, viscosifier, fluid loss reducer and inhibitor, and its weight and number ratio is, 400mL seawater: bentonite: sodium carbonate: viscosity increaser: fluid loss reducer: inhibitor= 100:3:3:0.1:0.5:5.

[0038] Described tackifier is PAC142. The fluid loss control agent is lignite resin. The inhibitor is sodium silicate and polyethylene glycol, and the weight ratio of sodium silicate and polyethylene glycol is sodium silicate:polyethylene glycol=3:5. The drilling fluid also includes NaOH, which adjusts the pH to 12. Others are with embodiment 1.

Embodiment 3

[0040] This drilling fluid comprises seawater, bentonite, sodium carbonate, viscosifier, fluid loss reducer and inhibitor, and its weight and number ratio is, 400mL seawater: bentonite: sodium carbonate: viscosity increaser: fluid loss reducer: inhibitor= 100:8:8:0.7:1:10.

[0041] Described tackifier is PAC142. The fluid loss control agent is lignite resin. The inhibitor is sodium silicate and polyethylene glycol, and the weight ratio of sodium silicate and polyethylene glycol is sodium silicate:polyethylene glycol=3:5. The drilling fluid also includes NaOH, which adjusts the pH to 12. Others are with embodiment 1.

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Abstract

The invention relates to a sodium silicate containing polyalcohol drilling fluid for offshore drilling. The drilling fluid is prepared from seawater, bentonite, sodium carbonate, a tackifier, a filtrate reducer and an inhibitor in weight part ratio. The drilling fluid is a high-blocking type drilling fluid which has higher inhibitive ability and lubricity and is suitable for being used for offshore drilling, is simple to prepare and is easily operated for site operation.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to a sodium silicate polyalcohol drilling fluid for marine drilling. Background technique [0002] With the continuous development of oil and gas reservoirs on land and in the sea, looking at the research, development and application of drilling fluids at home and abroad for decades, it can be found that the main problems faced by offshore drilling fluids are: the high salinity of seawater makes it difficult for bentonite to dissolve in seawater Medium mixing slurry; the hydration and dispersion of fine solid particles leads to a large amount of drilling fluid; the poor rheology of drilling fluid makes it difficult to clean the wellbore, and the hydration of rock particles leads to instability of the wellbore. Contents of the invention [0003] In view of the above problems, the present invention provides a drilling fluid, which has better inhibitory, plugging and lubricating properties, and is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/12
Inventor 潘一李沼萱刘天龙杨双春荣继光唐佳斌温航李剑虹
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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