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Foaming agent suitable for oil-field development

A technology for oil field development and foaming agent, which is used in the foaming agent field of foam profile control, oil displacement, drilling and drainage and gas production in oilfields, can solve the problems of restricting the wide application of foam, and achieve good biodegradability and low production cost. , the effect of significant economic benefits

Active Publication Date: 2012-06-20
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] Use a foam scanner to measure the foamability and foam stability of different foaming agents. Under the condition of constant temperature of 45°C, nitrogen gas is injected at a flow rate of 30mL / min for 5 minutes. The foam volume produced at the end of gas injection is used as the foaming performance of the blowing agent, namely the foaming volume (V). The time taken for the foam volume to decay to half is used as the foam stability evaluation index, that is, the foam half-life (t). Foam Composite Index (FCI) can take into account both foam volume and foam half-life, and its calculation relationship is FCI=3V·t / 4.

[0018] The foam properties of different blowing agents are shown in Table 1. It can be seen from Table 1 that the foaming volume of different blowing agents is higher than 160mL, the foam half-life is more than 60min, and the foam composite index is higher than 8000mL·min, which shows that different blowing agents have very good foam performance and can mee...

Embodiment 2

[0022] The experimental method of foam profile control and oil displacement effect of foaming agent is as follows: (a) select artificial three-layer heterogeneous core of 4.5 cm × 4.5 cm × 30 cm, the coefficient of variation is 0.72, and the permeability is 1100 × 10 -3 μm 2 Around 22-25% porosity. Vacuum down to -1.0MPa for two hours, then saturate with water, and measure the core pore volume. Saturated Daqing oilfield simulated oil (viscosity 9.5cp), determine oil saturation, aged for more than 12 hours. (b) Water drive oil to 98% water cut, record injection pressure, oil production and water production, and calculate water flooding recovery. (d) During foam flooding, nitrogen gas is selected as the gas, gas and liquid are injected simultaneously, the 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 injection pressure, oil production and water pro...

Embodiment 3

[0028] For the measurement of the drainage capacity of the foaming agent, under the condition of simulating the gas well tubing at 90°C, the foaming agent solution is made to generate foam by means of air flow agitation, and the drainage capacity within 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 150mL, 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 blowing agent

[0030] experiment number Foaming agent composition and ratio Carrying capacity (mL) Liquid carrying time (min) 1# Sodium α-olefin sulfonate (containing 14-16 carbons) 0.5wt%, lauryl amidopropyl dimethyl betaine 0.35wt%, partially hydrolyzed pol...

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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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IPC IPC(8): C09K8/584C09K8/594C09K8/38
Inventor 刘宏生曾嘉郭松林
Owner PETROCHINA CO LTD
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