Modified petroleum coke granule composite profile control water blocking agent and multi-round bidirectional blocking control technology

Abstract

The invention discloses a modified petroleum coke granule composite profile control water blocking agent and a multi-round bidirectional blocking control technology. The water blocking agent comprises agents A, B and C, the agent A comprises the ingredients: polyacrylamide solution with the concentration of 0.1-0.3% (by weight), sodium silicate, aluminum potassium sulfate, hydrochloric acid with the concentration of 30% ( by weight), and calcium chloride, the agent B comprises polyacrylamide solution with the concentration of 0.1-0.3% (by weight), modified petroleum coke granules of 20-800mum and surfactant, and the agent C comprises the ingredients: polyacrylamide solution with the concentration of 0.3-0.7% (by weight), N-N' methylene bisacrylamide, organic chromium crosslinking agent, and thiocarbamide; and the multi-round bidirectional blocking control technology is of a multi-round bidirectional blocking control measure developed according to geologic features, state and oil producing conditions of different regions of oil fields; and the water blocking agent is matched with the blocking control technology, so that the problems that the conventional profile control water blocking agent is low in strength, and bad in anti-erosion property and shearing resistance property can be solved, further digging of remaining petroleum is conducted, the water content ratio of an oil well can be reduced, the effect of displacement in flooding can be improved, and the production demand of the oil field can be met.

Description

technical field [0001] The invention relates to oil exploitation in an oil field, in particular to a compound profile control water plugging agent of modified petroleum rubber particles and multi-round two-way plugging control technology. Background technique [0002] With the development of oilfield water injection, due to the difference in permeability of each oil layer, the injected water will rush along the high permeability layer, especially the low permeability oil layer is repeatedly artificially fractured, resulting in serious water flooding of each sedimentary unit of the oil layer, and the plane, interlayer, The production difference in the layer is relatively prominent, some wells have low efficiency and serious invalid circulation, and the water cut of oil wells rises rapidly, resulting in premature water flooding of oil wells. Water production from oil wells is a common problem. Due to the water flooding large pores and fractured oil layers formed by water injec...

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Problems solved by technology

[0003] The object of the present invention is to provide a modified petroleum rubber particle composite profile control and water shutoff agent for the above problems, which has excellent performance in temperature resistance, salt resistance and shear resistance, and is a selective profile control and water shutoff agent. It solves the problems of low strength, poor erosion resistance and shear resistance of conventional profile control and water shutoff agents, and is suitable for profile control and water shutoff requirements of deep wells and low permeability reservoirs with different formation temperatures, and meets the needs of oilfield production; at the same time Provide a multi-round two-way plugging adjustment technology to further tap the remaining oil, reduce the water cut ratio of the oil well, improve the recovery rate, improve the utilization rate of injected water, and improve the water injection displacement effect

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