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Foaming system for air foam flooding and its preparation method and application

An air foam flooding system technology, applied in chemical instruments and methods, mining fluids, earth drilling and mining, etc., can solve the problems of increased construction difficulty, limited plugging capacity, increased construction cost, etc., to reduce construction procedures and operational difficulties , Increased construction cost and strong plugging performance

Active Publication Date: 2022-02-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the known foaming systems have good foaming and foam stabilizing properties, there are still two problems in the actual application process of air foam flooding: one is that the commonly used foaming systems have weak foam stabilizing ability, and usually the foam The stabilization time does not exceed 500 seconds, and polymer stabilizers need to be added to meet the design requirements of the scheme when preparing the foam solution during on-site construction, which increases the difficulty of construction
Second, although the foam has a certain sealing effect, the sealing capacity is limited, and the oil reservoir still faces the risk of gas channeling. Gas channeling will cause oxygen in the air to enter the oil well, causing explosion hazards
Faced with this problem, in the application process of air foam flooding, it is usually necessary to equip a high-power oxygen removal device to reduce the oxygen content in the air to a safe range, which greatly increases the construction cost

Method used

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  • Foaming system for air foam flooding and its preparation method and application

Examples

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Comparison scheme
Effect test

Embodiment 1

[0049] A foaming system for air foam flooding, the weight percentage of each component is:

[0050] Fatty alcohol polyoxyethylene ether sodium sulfate (carbon number is 12): 10%;

[0051] Sodium α-alkenyl sulfonate (14 carbons): 25%;

[0052] Silicone polyether emulsion: 5%;

[0053] Acetone: 10%;

[0054] Hydroxylamine hydrochloride: 10%;

[0055] The balance is tap water, and the sum of the weight percentages of each component is 100%.

[0056] The preparation method of the foaming system for air foam flooding of the present embodiment specifically comprises the following steps:

[0057] Step 1. Add measured water and acetone to the reaction kettle respectively, and stir evenly;

[0058] Step 2. Slowly add a good amount of hydroxylamine hydrochloride into the solution prepared in step 1, stir while adding, and stir for 1 hour until the hydroxylamine hydrochloride is completely dissolved, and keep the temperature of the reaction kettle at 30°C;

[0059] Step 3. Slowly a...

Embodiment 2

[0062] A foaming system for air foam flooding, the weight percentage of each component is:

[0063] Fatty alcohol polyoxyethylene ether sodium sulfate (carbon number is 14): 20%;

[0064] Sodium α-alkenyl sulfonate (16 carbons): 15%;

[0065] Modified silicone polyether emulsion: 7%;

[0066] Acetone: 12%;

[0067] Hydroxylamine hydrochloride: 13%;

[0068] The balance is tap water, and the sum of the weight percentages of each component is 100%.

[0069] The preparation method of the foaming system for air foam flooding of the present embodiment specifically comprises the following steps:

[0070] Step 1. Add measured water and acetone to the reaction kettle respectively, and stir evenly;

[0071] Step 2. Slowly add a good amount of hydroxylamine hydrochloride into the solution prepared in step 1, stir while adding, and stir for 0.5 hours until the hydroxylamine hydrochloride is completely dissolved, and keep the temperature of the reaction kettle at 32°C;

[0072] Step...

Embodiment 3

[0075] A foaming system for air foam flooding, the weight percentage of each component is:

[0076] Fatty alcohol polyoxyethylene ether sodium sulfate: 30%;

[0077] Silicone polyether emulsion: 2%;

[0078] Acetone: 11%;

[0079] Hydroxylamine hydrochloride: 12%;

[0080] The balance is tap water, and the sum of the weight percentages of each component is 100%.

[0081] The preparation method of the foaming system for air foam flooding of the present embodiment specifically comprises the following steps:

[0082] Step 1. Add measured water and acetone to the reaction kettle respectively, and stir evenly;

[0083] Step 2. Slowly add a good amount of silicone resin polyether emulsion into the solution prepared in step 1, stir while adding, and stir for 1.5 hours until the solution is fully mixed and uniform, and keep the temperature of the reactor at 30°C;

[0084] Step 3. Slowly add a good amount of hydroxylamine hydrochloride into the solution prepared in step 2, stir wh...

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Abstract

The invention discloses a foaming system for air foam flooding. The components and their weight percentages are: 30%-50% of surfactant, 2%-13% of stabilizer, 20%-25% of deoxidizing aid, The amount is water. The foaming system for air foam flooding of the present invention is suitable for oil reservoirs with a temperature of 40-80 DEG C, and has strong foaming performance, foam stabilizing performance and oxygen removal ability. It also discloses its preparation method, in which a stabilizer is added during the preparation process, no additional stabilizer is needed during construction, no need to add an oxygen removal device at the wellhead to deoxidize the air, and after being injected into the formation alternately or together with the air, it has a relatively Strong plugging performance, and can greatly reduce the risk of oxygen intrusion into the oil well, and realize the safe, efficient and low-cost operation of air foam flooding.

Description

technical field [0001] The invention belongs to the technical field of oil field development, and in particular relates to an air foam flooding foaming system and its preparation method and application. Background technique [0002] Air foam flooding is an enhanced oil recovery technology in which air and foaming agent are mixed in a certain proportion on the ground or in the oil layer to form foam as a means of oil displacement. This technology organically combines air flooding and foam flooding, which can not only significantly improve the sweep efficiency, but also improve the oil washing efficiency. It is an enhanced oil recovery technology with broad application prospects. [0003] Foaming system (also called foaming system) is the core of air foam flooding technology, and foaming system is usually composed of surfactant, stabilizer and water. At present, the known foaming system formulations mainly include the following types: Patent document 201210191135.1 discloses ...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/584C09K8/588C09K8/94E21B43/22
CPCC09K8/58C09K8/584C09K8/588C09K8/94E21B43/166E21B43/16
Inventor 范伟熊维亮李姝蔓赵继勇李兆国张永强杨金龙余光明王靖华刘静李文宏刘蕾王丽莉
Owner PETROCHINA CO LTD
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