Foam stabilizer for nitrogen foam combination flooding, foam composition, oil extraction method and application

A nitrogen foam and compound flooding technology, which is applied in the direction of drilling composition, chemical instruments and methods, and production fluids, can solve the problems of foam instability and poor temperature resistance of the foam system, and achieve simple and stable preparation methods Good, simple construction process

Inactive Publication Date: 2015-09-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The foam stabilizer can solve the problems of poor temperature resistance of the foam system and foam instability when nitrogen foam composite flooding is applied to fractured reservoirs with edge and bottom water in middle and deep formations

Method used

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  • Foam stabilizer for nitrogen foam combination flooding, foam composition, oil extraction method and application
  • Foam stabilizer for nitrogen foam combination flooding, foam composition, oil extraction method and application
  • Foam stabilizer for nitrogen foam combination flooding, foam composition, oil extraction method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The foam stabilizing performance of the foam stabilizer at room temperature was determined by high-speed stirring method.

[0030] According to foaming agent (being made up of 0.3% alpha-olefin sodium sulfonate and 0.2% sodium lauryl sulfate by mass concentration) mass concentration is 0.5%, foam stabilizer (by polyanionic cellulose, agar Powder, β-cyclodextrin, sodium tripolyphosphate and triethanolamine are composed according to the mass ratio of 55:7:3:3:2) and the mass concentration is 0.07%, which is prepared into 1000mL of foam composition (being an aqueous solution), pH The value is 6-9, and the preparation method is as follows: mix the raw materials in proportion, stir at 65° C. for 20-35 minutes, mix well, and cool to obtain the foam composition.

[0031] Take 200mL of the above solution in an automatic mixer, stir at high speed (3000rad / min) for 60s, pour the foam into a 1000mL graduated cylinder and read the foam volume as the foam volume. At the same time, ...

Embodiment 2

[0036] The foam stabilizing performance of the temperature-resistant foam stabilizer was determined by high-speed stirring method.

[0037] Take 300mL of the foam composition in Example 1 and put it into a high-temperature and high-pressure reaction kettle or a high-temperature-resistant steel cylinder, seal it and put it in a high-temperature thermostat, take it out after keeping the temperature at 120°C for 24 hours, and open the kettle body or a resistant steel cylinder after naturally cooling to room temperature. Take out the sample solution from the high-temperature steel cylinder for later use, take 200mL of the above-mentioned sample solution in an automatic mixer with a measuring cylinder, stir at a high speed (3000rad / min) for 60s, pour the foam into a 1000mL measuring cylinder and read the foam volume, which is the after-temperature resistance foam volume. At the same time, start timing immediately after pouring the foam into the 1000mL measuring cylinder, and record...

Embodiment 3

[0042] Concentration comparison of foam stabilizers.

[0043] A foam stabilizer composed of polyanionic cellulose, agar powder, β-cyclodextrin, sodium tripolyphosphate and triethanolamine is used in a mass ratio of 55:7:3:3:2, for foam stabilizers containing different concentrations The foam composition is carried out the test of foaming volume and foam half-water period, and test is carried out at normal temperature, and test method is identical with embodiment 1. Wherein, based on the total mass of the foam composition, the mass concentration range of the foam stabilizer is 0.01%-0.12%, and the blowing agent (by mass concentration is 0.3% alpha-olefin sodium and mass concentration is 0.2% ten Dialkyl sodium sulfate) mass concentration is 0.5%, the pH value of the foam composition is 6-9, and the preparation method of the foam composition is the same as that in Example 1. The experimental results are shown in Table 3.

[0044] The impact of table 3 foam stabilizer concentra...

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Abstract

The invention provides a foam stabilizer for nitrogen foam combination flooding, a foam composition, an oil extraction method and application. The foam stabilizer includes the following raw materials: polyanionic cellulose, agar powder, beta-cyclodextrin, sodium tripolyphosphate and triethanolamine, with a mass ratio of (50-65):(5-10):(2-5):(3-6):(1-5). The foam composition includes the following raw materials: 0.2-0.5wt% of sodium alpha-olefin sulfonate, 0.1-0.3wt% of sodium lauryl sulfate, and 0.01-0.12wt% of a foam stabilizer and the balance of water. The method for preparing the foam composition is as follows: mixing the raw materials, stirring at 60-90 DEG C for 20-35 minutes, and cooling. The oil extraction method is as follows: injecting the foam composition and nitrogen into the target oil layer in a synchronous or alternating manner. The foam stabilizer provided by the invention can solve the problems that when the nitrogen foam combination flooding is applied to fractured reservoir with deep edge and bottom water, the temperature resistance of the foam system is poor, the foam is unstable, and the like.

Description

technical field [0001] The invention belongs to the technical field of oil stabilization and water control in the field of oilfield development, and in particular relates to a foam stabilizer for nitrogen foam composite flooding and a foam composition containing it, and a nitrogen foam composite compounding agent using the foam composition. The oil recovery method of flooding, and the application of the foam stabilizer and the foam composition are especially suitable for medium-deep edge-bottom water fractured reservoirs. Background technique [0002] In the process of oil field production, when the edge-bottom water fractured reservoir enters the middle and late stage of water flooding development, the underground deficit is serious, and the remaining oil is mostly distributed in the corners of low-permeability layers and pores, the remaining oil is highly dispersed, and the reservoir is heterogeneous. The property is strong, once the edge and bottom water break through, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/594E21B43/22
CPCC09K8/594E21B43/168
Inventor 刘强李瑞马昌明王立军王迪张俊赵剑飞柳荣伟吕孝明邓红涛安志杰蒋伟管紫君
Owner PETROCHINA CO LTD
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