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Antifreezing foaming drainage agent, and preparation method and application thereof

A foam drainage agent and reaction container technology, which is applied in chemical instruments and methods, earthwork drilling, and fluid extraction, etc., can solve the problems of inability to perform drainage and gas extraction, affect normal production, and produce unstable production, and improve thermal stability. and salt tolerance, good compounding and synergistic effect, the effect of lowering freezing point

Active Publication Date: 2016-06-15
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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  • Antifreezing foaming drainage agent, and preparation method and application thereof
  • Antifreezing foaming drainage agent, and preparation method and application thereof
  • Antifreezing foaming drainage agent, and preparation method and application thereof

Examples

Experimental program
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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%, α-olefin sodium sulfonate 20%, polyanionic cellulose 2.5%, coconut acid 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 the present embodiment are as follows:

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

[0033] (2) Add polyanionic cellulose and coconut acid diethanolamide successively in above-mentioned reactor, stir 15 minutes at normal temperature, stirring speed is 300 rev / mins;

[0034] (3) Add ethylene glyc...

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%, α-olefin sodium sulfonate 15%, polyanionic cellulose 2%, coconut acid 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 antifreeze foam drainage agent in the present embodiment are as follows:

[0069] (1) Add fatty alcohol polyoxyethylene ether phosphate sodium salt and α-olefin sulfonate sodium successively into the reaction kettle, stir at normal temperature for 20 minutes, and the stirring speed is 200 rpm;

[0070] (2) Add polyanionic cellulose and coconut acid diethanolamide successively in above-mentioned reactor solution, stir 10 minutes at normal temperature, stirring speed is 200 rev / mins;

[0071] (3)...

Embodiment 3

[0103] The antifreeze foam drainage agent that above-mentioned embodiment 1 and 2 provides is applied in the drainage gas recovery of natural gas well, utilizes wellhead dosing tank (such as figure 1 As shown), the liquid antifreeze foam drainage agent is added into the wellbore from the casing. 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 air flow, thereby reducing the The back pressure at the bottom of the well is improved, the water-carrying capacity of the gas flow is improved, and the purpose of increasing natural gas production is achieved.

[0104] The construction steps of dosing (adding antifreeze foam drainage agent) to the casing of natural gas wells are as follows:

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

[0106] 2) Open the feeding inl...

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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 recovery of natural gas wells in oil fields, and belongs to the technical field of natural gas recovery. 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 later stage of development, the formation pressure has decayed, and the gas wells have entered a period of high water cut, so that the gas wells cannot rely on their own energy to push the liquid flowing into the bottom of the well to the surface, resulting in liquid accumulation in the wellbore, resulting in a decrease in natural gas production. If the decline is serious, it will cause water flooding and stop production of the gas well, so the drainage of the gas well is imperative. Rod drainage has temporarily solved the problem of pr...

Claims

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Application Information

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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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