Thick oil huff and puff deep channel blocking system and injection method thereof

A systematic and deep technology, applied in chemical instruments and methods, mining fluids, earth drilling and mining, etc., can solve problems such as poor channel sealing effect, poor channel sealing effect, and poor stability of foam plugging agent, so as to improve the development effect, Improve the effect of sweeping volume and uniformity of steam absorption profile

Active Publication Date: 2011-05-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

At present, the commonly used inorganic particles are difficult to enter the deep part of the formation, the plugging distance is short, and the steam continues to point after the bypass flow, and there are...

Method used

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Embodiment Construction

[0008] The present invention will be described in detail below in conjunction with the examples.

[0009] Since the formation temperature decreases sequentially from the wellhead to the deep formation after steam injection, the thermal thixotropic system should be injected first, then the temperature-resistant supramolecular system, and finally the solidification system.

[0010] In order to make the deep channel sealing system preferentially injected into the high-permeability layer, the injection rate is controlled at 6-10m 3 h -1 . The injection pressure of the deep channel sealing system does not exceed 80% of the fracture pressure of the formation; the difference between the injection pressure of the deep channel sealing system and the initial formation pressure does not exceed 4.0MPa.

[0011] There are two test wells A and B, see Table 1 and Table 2 for their basic information, and Table 3 and Table 4 for working fluid injection.

[0012] Table 1 Overview of Well A (...

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Abstract

The invention provides a thick oil huff and puff deep channel blocking system and an injection method thereof. Solidification channel blocking agent composed of sodium and soil aqueous solution with the mass fraction of 4.0% to 6.0% and cement slurry with the mass fraction of 4.0% to 6.0% is adopted in a near wellbore zone, wherein the volume ratio of the two solutions is (0.8 to 1.2) : 1; temperature resistance supermolecule channel blocking agent composed of HPAM (polyacrylamide) aqueous solution with the mass fraction of 4.0% to 6.0% and phenolic resin aqueous solution with the mass fraction of 1.0% to 1.4% is adopted in a transition zone, wherein the volume ratio of the two solutions is (0.8 to 1.2) : 1; and temperature sensitive polymer aqueous solution with the mass fraction of 2.0%to 4.0% is taken as thermal thixotropic channel blocking agent in a far wellbore zone. According to the invention, steam channeling of large porous channels is blocked with the solidification channelblocking agent and the temperature resistance supermolecule channel blocking agent, and steam channeling generated by fine slits is blocked with the thermal thixotropic channel blocking agent, so that the purpose of deep channel blocking is achieved through combined blocking of the blocking agents.

Description

Technical field: [0001] The invention relates to a technology for further enhancing crude oil recovery in the technical field of oil and gas field development engineering, in particular adopting a deep channeling system to improve the swept volume of steam in a steam huff and puff well, thereby enhancing crude oil recovery. technical background: [0002] During the process of steam huff and puff, due to the influence of unfavorable factors such as heterogeneity of the oil layer, high density difference between steam and heavy oil, and high mobility ratio, steam overlay and steam fingering occur in the oil layer, resulting in a gap between wells and wells. Steam channeling occurs. Steam channeling makes the vertical suction section of the oil layer uneven, and the steam advances unevenly in the horizontal direction, so that the swept volume of the steam becomes smaller, thereby reducing the recovery rate of heavy oil thermal recovery and increasing energy consumption. Using ...

Claims

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Application Information

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IPC IPC(8): C09K8/46E21B43/24E21B33/13E21B43/22
Inventor 戴彩丽由庆纪文娟薄启炜赵福麟陈新民
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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