Profile controlling and flooding composition and profile controlling and flooding method

Abstract

The invention provides a profile controlling and flooding composition and a profile controlling and flooding method. The profile controlling and flooding composition comprises a first blocking agent and a second blocking agent, wherein the first blocking agent comprises the following components in parts by weight: 0.08-0.11 part of xanthan gum, 0.25-0.34 part of a retarder, 0.8-1.2 parts of a nonionic surfactant, 1-3 parts of aluminum hydroxide and 98-99 parts of water; the first blocking agent also contains 350ppm to 430ppm of polyacrylamide; the second blocking agent comprises the following components in parts by weight: 0.18-0.23 part of aluminum citrate, 0.18-0.21 part of sodium dichromate, 0.8-1.2 part of acetic acid, 0.4-0.6 part of a gel accelerant and 97-98 parts of water. The profile controlling and flooding composition is good in blocking property in oil preservation at a temperature higher than 150 DEG C, simple in gel formation process, resistant to scouring, wide in application range and capable of realizing both water flooding and alkali flooding.

Description

technical field [0001] The invention relates to a control and flooding composition and a control and flooding method, belonging to the technical field of oil and gas well development control and flooding. Background technique [0002] my country's low-permeability and ultra-low-permeability oilfields are relatively rich in reserve resources. With the advancement of petroleum exploration and development technology, the proportion of proven and produced geological reserves in low-permeability oilfields to the total geological reserves has increased significantly. According to preliminary statistics, among the recent proven reserves, low-permeability reserves account for as high as 60%-70%. These low-permeability oil fields have the characteristics of wide reservoir area, large reserves, low abundance, poor physical properties, and difficult development. The development of low-permeability and ultra-low-permeability oilfield reserves has become an important potential for the st...

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Problems solved by technology

[0003] The patent document with the notification number CN1464007A discloses a temperature-resistant and salt-resistant water-absorbing resin. Although it can drive and plug some oil fields with large pores and large fractures, the water-absorbing resin is only suitable for oil fields below 150°C. High ultra-low permeability oilfields are still unusable and easy to be washed away; the patent with the notification number CN104140801A discloses an aluminum gel control and displacement agent. However, the preparation process is complicated, and the gelation process is also affected by the temperature and pH of the reservoir, so the scope of application is still limited

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