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Foaming agent suitable for oil-field development

A foaming agent technology for oilfield development, applied in the foaming agent field of oilfield foam profile control, oil displacement, drilling and drainage and gas recovery, it can solve the problems that limit the wide application of foam, and achieve good biodegradability and foaming And the effect of good foam stability and wide adaptability

Active Publication Date: 2013-10-30
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This limits the wide application of foam in oilfield development to some extent

Method used

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  • Foaming agent suitable for oil-field development
  • Foaming agent suitable for oil-field development

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The foam scanner was used to determine the foamability and foam stability of different foaming agents. The foam measuring instrument by airflow method was used to inject nitrogen at a flow rate of 30 mL / min at a constant temperature of 45°C and injected for 5 minutes. The foam volume generated at the end of the gas injection is used as the foaming performance of the blowing agent, that is, the foaming volume (V). The time taken when the foam volume decays to half is used as the foam stability evaluation index, namely the foam half-life (t). Foam Composite Index (FCI) can consider both foaming volume and foam half-life at the same time, and its calculation relationship is FCI=3V·t / 4.

[0018] The foam properties of different foaming agents are shown in Table 1. It can be seen from Table 1 that the foaming volume of different foaming agents is higher than 160mL, the half-life of the foam is higher than 60min, and the comprehensive foam index is higher than 8000mL·min, indic...

Embodiment 2

[0022] The experimental method of foam profile control and oil displacement effect of foaming agent is as follows: (a) Select a 4.5cm × 4.5cm × 30cm artificial three-layer heterogeneous core with a coefficient of variation of 0.72 and a permeability of 1100×10 -3 μm 2 Around, the porosity is 22-25%. Evacuate to -1.0MPa for two hours, then saturate with water, and measure the core pore volume. Saturate the simulated oil of Daqing Oilfield (viscosity 9.5cp), determine the oil saturation, and age for more than 12 hours. (b) Water drive oil to 98% water cut, record injection pressure, oil production and water production, and calculate water drive recovery. (d) In foam flooding, nitrogen is selected as gas, gas and liquid are injected at the same time, gas-liquid ratio is 1:1, and 0.5 times the core pore volume (PV) of the foaming agent solution to be tested is injected. Then follow-up water flooding to 98% water cut, record the injection pressure, oil production and water producti...

Embodiment 3

[0028] The foaming agent drainage capacity is measured. Under the condition of 90℃ simulating gas well tubing, the foaming agent solution is foamed by air agitation, and the drainage capacity in a certain period of time is measured. The drainage capacity of different foaming agents is shown in Table 3. It can be seen from Table 3 that the liquid carrying capacity of different foaming agents is close to 150 mL, and the foaming agent numbered 3# takes the shortest time. This shows that different foaming agents have good drainage capacity, which can meet the needs of gas well foam drainage and gas recovery.

[0029] Table 3 Drainage capacity of foaming agent

[0030] Experiment number Foaming agent composition and ratio Liquid carrying capacity (mL) Liquid carrying time (min) 1# Sodium α-olefin sulfonate (containing 14 to 16 carbons) 0.5wt%, lauramide propyl dimethyl betaine 0.35wt%, partially hydrolyzed polyacrylamide (molecular weight 16 million) 0.02%145.613.4 2# Sodium α-ole...

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Abstract

The invention provides a foaming agent suitable for oil-field development. The foaming agent suitable for oil-field development comprises the following components by weight percent: 0.05-1.0% of anionic surfactant, 0.05-1.0% of amphoteric surfactant, 0-1.0% of nonionic surfactant, 0.01-1.0% of foam stabilizer, 0-0.8% of inorganic salt and the balance water. The composition and proportioning of the foaming agent can be adjusted at any time according to the actual situations of different application fields of oil-field development, the foaming agent is convenient in production, has wide applicability and remarkable economic benefit; and the foaming agent has good biodegradability and can not pollute the environment or damage the formation.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a foaming agent used for oilfield foam profile control, oil displacement, well drilling and drainage and gas recovery. Background technique [0002] Since the idea of ​​using foam as a fluidity control agent was first proposed in 1958, many research institutions at home and abroad have conducted research on foam technology for more than 40 years. At present, foam is widely used in oil displacement, profile control, fracturing and drilling operations. Foam is a dispersion system formed by gas in the liquid phase under the action of a blowing agent. The main reason why foam has the effect of profile control and oil displacement is the seepage characteristics of foam in porous media, that is, the foam "blocks large but not small , water blocking but not oil blocking” effect, causing the foam to advance evenly in the high and low permeability layers. At the same time, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
Inventor 刘宏生曾嘉郭松林
Owner PETROCHINA CO LTD
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