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Foam profile control system suitable for advanced profile control of oilfield and preparation method of foam profile control system

A foam and system technology, applied in chemical instruments and methods, mining fluids, earthwork drilling, etc., can solve the problems of easily broken glue, unstable gel foam system, poor sealing effect, etc., and achieve strong salt resistance. Effect

Active Publication Date: 2014-11-19
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, before the foam solution in the prior art is gelled and after the gel foam system is broken, the plugging effect is poor, and the gel foam system is unstable and easy to break.

Method used

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  • Foam profile control system suitable for advanced profile control of oilfield and preparation method of foam profile control system
  • Foam profile control system suitable for advanced profile control of oilfield and preparation method of foam profile control system
  • Foam profile control system suitable for advanced profile control of oilfield and preparation method of foam profile control system

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Experimental program
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preparation example Construction

[0049] The present invention also provides a preparation method of the above-mentioned foam profile control system, comprising the following steps:

[0050] (1) Mix the second surfactant with water, stir to dissolve it completely, and obtain the second surfactant aqueous solution. Add the particles into the second surfactant aqueous solution and stir for 12 hours, and then use an ultrasonic emulsifier to homogenize and disperse for 30 minutes, so that the particles are uniformly dispersed in the second surfactant aqueous solution. Then, the first surfactant and the foam stabilizer were sequentially added into the second surfactant aqueous solution and stirred slowly for 2 hours to obtain a mixed solution A of the first surfactant, the second surfactant, granules and the foam stabilizer;

[0051] (2) Mix the polymer, inorganic salt and water, stir for 2 h to dissolve completely, and obtain a polymer solution. Then add the crosslinking agent, stabilizer, and regulator into the ...

Embodiment 1

[0057] Embodiment 1, parameters and foam performance of foam profile control system

[0058] Table 1 provides specific examples 1-6 of foam profile control systems suitable for oilfield depth profile control. All are prepared according to the preparation method of the above-mentioned foam profile control system. Then the interfacial tension, bubble volume, foam half-life, gelation time and gel strength at each temperature were measured.

[0059] The US TX500C spinning drop interfacial tensiometer was used to measure the oil-water interfacial tension at 45°C and 4000 rpm. The oil used in the experiment was Daqing crude oil. The foaming ability and foam stabilizing ability of the foam profile control system were measured by Roche foam meter and ultrasonic emulsification machine (manufactured by Hangzhou Chenggong Ultrasonic Equipment Co., Ltd., the instrument model is YPSH520202). Inject carbon dioxide, natural gas or nitrogen into the profile control system for 5 minutes, mix...

Embodiment 2

[0065] Embodiment 2, oil displacement effect of foam profile control system

[0066] 1. Water flooding plugging experiment

[0067]Experimental research method of water flooding foam plugging: a) In a constant temperature box at 90°C, select parallel sand-packing pipes with permeability of 600mD (low-permeability sand-filling pipes) and 3000mD (high-permeability sand-filling pipes). It is 120cm and the diameter is 2.4cm. Evacuate the saturated water in the sand-filled pipe, measure the volume of saturated water, and obtain the pore volume of the sand-filled pipe; then measure the water permeability. b) Inject crude oil into the sand filling pipe, measure the volume of water flowing out from the outlet end, which is the volume of saturated crude oil in the sand filling pipe; the ratio of crude oil volume to pore volume is the oil saturation. c) Water flooding to a water cut above 98%, calculate the diversion rate and recovery factor of the high-permeability and low-permeabili...

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Abstract

The invention discloses a foam profile control system suitable for advanced profile control of an oilfield. A liquid of the system is prepared from a first surfactant, a second surfactant, granules, a foam stabilizer, a polymer, a crosslinking agent, a stabilizer, an adjustor, inorganic salt, a control agent and water. The foam profile control system has three characteristics of foam, gels and granules at the same time, and has a strong deep sealing capacity to a high-permeability oil layer, namely, has an effect on expanding the swept volume. The system further can reduce the oil-water interface tension, and mainly exerts a gel performance at a low-permeability layer and a foam property at a high-permeability layer, that is, the system has the effects on improving the oil dispelling efficiency and selectively plugging water. When the system is used, as gases exist, the use level of the foam profile control system is reduced, and the foam profile control system has the characteristics of temperature resistance and salt resistance at the same time.

Description

technical field [0001] The invention relates to a foam profile control system formula used for foam profile control in oil field development, in particular to a foam profile control system used for oil field depth profile control and a preparation method thereof. Background technique [0002] As oilfield development enters the middle and late stages, the water production situation of oil wells is becoming more and more serious. After the oil well produces water, the heterogeneous multiple oil layers and the homogeneous loose sandstone layer will be damaged, resulting in sand production in the oil well, which reduces the production capacity of the oil well. If the sand production is severe, the oil layer will be buried or the oil layer will collapse, resulting in the shutdown of the oil well. . [0003] In the process of water flooding and polymer flooding, in the case of co-injection and production of oil layers with different permeability, the injected water and polymer ad...

Claims

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Application Information

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IPC IPC(8): C09K8/512C09K8/518C09K8/58E21B33/13E21B43/22
CPCC09K8/512C09K8/518C09K8/58C09K2208/10C09K2208/18
Inventor 刘宏生王景芹杨莉吕昌森曹瑞波潘峰罗锋李勃王楠楠
Owner PETROCHINA CO LTD
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