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A kind of antifreeze foam drainage agent and its preparation method and application

A technology of foam drainage agent and reaction container, which is applied in the direction of chemical instruments and methods, earth drilling, mining fluids, etc. It can solve problems such as inability to drain water, affect normal production, and unstable production, and improve thermal stability. and salt tolerance, good compounding and synergistic effects, and the effect of lowering the freezing point

Active Publication Date: 2018-05-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although rod casting drainage has temporarily solved the problem of production decline caused by water outflow from gas wells, there are also some unsatisfactory aspects of rod casting drainage. When casting rods, the well needs to be shut down temporarily, and production is unstable. Sometimes, oil pipes will be blocked and normal production will be affected.
At the same time, due to the geographical location of Liaohe Oilfield, the winter is relatively long, and the general foaming agent will freeze when it is lower than zero degrees Celsius, which cannot make the foaming agent flow from the wellhead on the ground to the bottom of the well through the dosing device, thus It will not be able to achieve the purpose of drainage and gas recovery

Method used

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  • A kind of antifreeze foam drainage agent and its preparation method and application
  • A kind of antifreeze foam drainage agent and its preparation method and application
  • A kind of antifreeze foam drainage agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides an antifreeze foam drainage agent.

[0030] In terms of weight percentage, the raw material composition of the antifreeze foam drainage agent is: fatty alcohol polyoxyethylene ether phosphate sodium salt 30%, sodium α-olefin sulfonate 20%, polyanionic cellulose 2.5%, and coconut diethanolamide 1.5%, ethylene glycol 3%, potassium carbonate 1.5%, sodium chloride 1.2%, urea 0.8%, sodium acetate 0.6%, and the balance is water.

[0031] The preparation steps of the foaming agent in this embodiment are as follows:

[0032] (1) Add fatty alcohol polyoxyethylene ether phosphate sodium salt and α-olefin sulfonate sodium to the reaction kettle in sequence, and stir at room temperature for 25 minutes, and the stirring speed is 300 rpm;

[0033] (2) Add polyanionic cellulose and coconut acid diethanolamide to the above reaction kettle in sequence, and stir at room temperature for 15 minutes, and the stirring speed is 300 rpm;

[0034] (3) Add ethylene glycol, potass...

Embodiment 2

[0066] This embodiment provides an antifreeze foam drainage agent.

[0067] In terms of weight percentage, the raw material composition of the antifreeze foam drainage agent includes: fatty alcohol polyoxyethylene ether phosphate sodium salt 25%, sodium α-olefin sulfonate 15%, polyanionic cellulose 2%, and coconut oil diethanolamide 1%, isopropanol 2%, potassium carbonate 1.2%, sodium chloride 1%, urea 0.6%, sodium acetate 0.5%, and the balance is water.

[0068] The preparation steps of the antifreeze foam drainage agent in this embodiment are as follows:

[0069] (1) Add fatty alcohol polyoxyethylene ether phosphate sodium salt and α-olefin sulfonate sodium to the reaction kettle in sequence, and stir at room temperature for 20 minutes at a stirring speed of 200 rpm;

[0070] (2) Add polyanionic cellulose and coconut acid diethanolamide to the above-mentioned reaction kettle solution in sequence, and stir at room temperature for 10 minutes, and the stirring speed is 200 rpm;

[0071]...

Embodiment 3

[0103] The antifreeze foam drainage agent provided in the above examples 1 and 2 is applied to the drainage and gas production of natural gas wells, and the wellhead dosing tank (such as figure 1 (Shown), the liquid antifreeze foam drainage agent is added from the casing into the wellbore. After the pressure is balanced, the liquid flows to the bottom of the well by its own gravity, mixes with the fluid at the bottom of the well, and generates foam after being agitated by the airflow, thereby reducing The back pressure at the bottom of the well is improved, the water-carrying capacity of the gas flow is improved, and the goal of increasing the natural gas production is achieved.

[0104] The construction steps for adding medicine (adding antifreeze foam drainage agent) to natural gas well casing are as follows:

[0105] 1) Close the outlet valve (9) and balance valve (6) of the dosing tank (3), and open the drain valve (4) to drain;

[0106] 2) Open the feeding inlet valve (2) of th...

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Abstract

The invention provides an antifreezing foaming drainage agent, and a preparation method and application thereof. The antifreezing foaming drainage agent is prepared from the following raw materials in percentage by weight: 20-35% of fatty alcohol polyethenoxy ether phosphate sodium salt, 10-20% of sodium alpha-olefin sulfonate, 2-3% of polyanionic cellulose, 1-2% of coco fatty acid diethanol amide, 2-4% of alcohol, 1-1.5% of potassium carbonate, 1-1.5% of sodium chloride, 0.5-1% of urea, 0.5-1% of sodium acetate and the balance of water. The preparation method comprises the following step: sequentially adding the raw materials into a reaction vessel while stirring. The antifreezing foaming drainage agent provided by the invention has the advantages of excellent oil resistance, excellent salt tolerance, excellent foaming capacity, excellent water carrying capacity and low solidifying point (-30 DEG C), and is suitable for drainage and gas recovery operation of natural gas wells under severe cold conditions.

Description

Technical field [0001] The application relates to a foam drainage agent suitable for drainage and gas recovery of natural gas wells in oil fields, and belongs to the technical field of natural gas extraction. Background technique [0002] Natural gas is a high-quality, clean and efficient energy source. It plays a pivotal role in the development of the national economy. In recent years, as the natural gas wells in Liaohe Oilfield have entered the late stage of development, the formation pressure has declined and the gas wells have entered a period of high water cut, making the gas wells unable to rely on their own energy to push the liquid flowing into the bottom of the well to the ground, resulting in fluid accumulation in the wellbore, resulting in natural gas production The decline will cause serious flooding and stop production of gas wells, so it is imperative to drain gas wells. Although the casting of rod drainage temporarily solved the problem of the decline in producti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/58E21B43/22
CPCC09K8/58C09K8/584C09K2208/08E21B43/16
Inventor 刘强袁鹏李瑞马昌明王浩郑猛张俊柳荣伟陈小凯刘建山高峰赵剑飞王奇邓红涛管紫君
Owner PETROCHINA CO LTD
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