Foam drilling fluid and preparation method thereof

A drilling fluid and foam technology, applied in the field of oil drilling fluid, can solve the problems of small foaming volume and short half-life time, and achieve the effect of good suspension performance, strong anti-pollution ability and solving reservoir pollution.

Inactive Publication Date: 2017-02-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the system does not contain fibrous material and t

Method used

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  • Foam drilling fluid and preparation method thereof
  • Foam drilling fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Under normal temperature and pressure conditions, disperse 3g of sepiolite in 142.5g of deionized water for 10 hours of prehydration treatment (prehydration treatment is to dissolve sepiolite in water to make its fiber structure more stretchable, and it takes a certain amount of time ), then add 3g sodium lauryl sulfate and 1.5g sodium dodecylbenzenesulfonate. Wherein the mass percentages of sodium lauryl sulfate (the first foaming agent), sodium dodecylbenzenesulfonate (the second foaming agent) and sepiolite (inorganic fiber) are respectively 2%, 1%, 2%. %. Stir evenly at 60°C and foam at room temperature with a mixer at 5000 rpm for 5 minutes to obtain foam drilling fluid with a foam volume of 880ml and a foam half-life of 60 minutes.

[0017] The foaming effect of the foam drilling fluid prepared in this embodiment is as follows: figure 1 shown.

Embodiment 2

[0019] Under normal temperature and pressure conditions, 4.5g of sepiolite was dispersed in 138.75g of deionized water for 12 hours of prehydration treatment, and then 4.5g of sodium dodecylsulfate and 2.25g of sodium dodecylbenzenesulfonate were added. Wherein the mass percentages of sodium lauryl sulfate (the first foaming agent), sodium dodecylbenzenesulfonate (the second foaming agent) and sepiolite (inorganic fiber) are respectively 3%, 1.5%, 3%. %. Stir evenly at 80°C and foam at room temperature at 7,500 rpm for 4.5 minutes to obtain a foam drilling fluid with a foam volume of 860ml and a foam half-life of 65 minutes.

Embodiment 3

[0021] Under normal temperature and pressure conditions, 1.5g of sepiolite was dispersed in 139.5g of deionized water for prehydration treatment for 8 hours, and then 6g of sodium dodecylsulfate and 3g of sodium dodecylbenzenesulfonate were added, of which ten The mass percentages of dialkyl sodium sulfate (the first foaming agent), sodium dodecylbenzenesulfonate (the second foaming agent) and sepiolite (inorganic fiber) are 4%, 2%, and 1%, respectively. Stir evenly at 60°C and foam at room temperature with a mixer at 5000 rpm for 5 minutes to obtain a foam drilling fluid with a foam volume of 960ml and a foam half-life of 50 minutes.

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Abstract

A foam drilling fluid is prepared from, in percentage by mass, 2%-4% of a first foaming agent, 1%-2% of a second foaming agent, 1%-3% of inorganic fibers and the balance of water, wherein dosage of the first foaming agent is the double of that of the second foaming agent. Under the normal-temperature and normal-pressure conditions, the inorganic fibers are dispersed in deionized water for prehydration treatment for 8-12 h, then the first foaming agent and the second foaming agent are added and evenly stirred at 60-80 DEG C, the mixture is foamed at the rotating speed of 5,000-8,000 rpm for 3-5 min, and the foam drilling fluid is prepared. The foam drilling fluid has good foaming capacity, high high-temperature-resistant and anti-pollution capacity, good dynamic yield point, good yield point and plastic viscosity ratio, good suspension property, higher inhibitive ability and proper water loss, can maintain the higher rate of penetration and water and rock carrying capacity in the drilling process and effectively solves the complex problems of wellbore instability, tool sticking, reservoir pollution and the like.

Description

technical field [0001] The invention relates to a high-temperature-resistant and anti-pollution foam drilling fluid and a preparation method thereof, belonging to the technical field of petroleum drilling fluids. Background technique [0002] Drilling fluid is one of the necessary materials used to balance formation pressure and ensure safe and smooth drilling during drilling. For deep oil and gas reservoirs with high shale content and high formation water salinity, it is best to use oil-based drilling fluids. However, oil-based drilling fluids cause serious environmental pollution, are easy to catch fire, and cost high. Conventional water-based drilling fluid density is difficult to control at 1.0g / cm 3 Below, the inhibition is poor, and when encountering high-salt deep well formations, the performance is prone to change, resulting in instability of the borehole wall and damage to the reservoir. Foam drilling fluid has low density, strong inhibition, good plugging ability...

Claims

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Application Information

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IPC IPC(8): C09K8/38C09K8/03C09K8/035
CPCC09K8/38C09K8/03C09K8/032C09K8/035C09K2208/08
Inventor 孙德军李振邦张厉董志浩
Owner SHANDONG UNIV
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