Method for water plugging for petroleum well with oil phase microparticle plugging agent

Abstract

The invention provides a method for water plugging for a petroleum well with an oil phase microparticle plugging agent. The method comprises the following steps: (1) screening the particle size range of the oil phase microparticles used according to different penetration rates and further selecting the radius size of the needed oil phase microparticle plugging agent according to the bridging principle; (2) mixing intermediate oil and superfine calcium carbonate together to prepare the oil phase microparticle plugging agent with the radius size needed in the step (1); (3) injecting the prepared oil phase microparticle plugging agent into the pumping well mouth of the petroleum well; (4) plugging to the high penetration water outlet section by the oil phase microparticle plugging agent; (5) when bottom water bursts again, injecting the oil phase microparticles in different particle sizes into the well again to control the bottom water bursting for many times, thereby uplifting the oil-water interface evenly and improving the bottom water wave and volume. The method can perform water plugging treatment for a high water well, lowers the anisotropy, and evenly uplifts the oil-water interface to the horizontal segment to improve the recovery efficiency.

Description

technical field [0001] The invention relates to a method for shutting off water in an oil well, in particular to a method for shutting off water in an oil well with an oil-phase microparticle plugging agent. Background technique [0002] Sandstone reservoirs with bottom water in the oilfield are mainly developed by horizontal wells. Due to the sufficient energy of the bottom water and serious heterogeneity of the reservoir, the development of horizontal wells shows that the bottom water coning into the high-permeability section along the high-permeability section and flooding, resulting in a large number of The remaining oil cannot be recovered. With the deepening of oilfield development, the water cut of horizontal wells continues to rise, and the number of high-water-cut and low-efficiency horizontal wells continues to increase. Improving the development effect of horizontal wells has become a difficult problem in current development. [0003] Existing oilfield horizontal...

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Problems solved by technology

Mechanical sealing is suitable for casing completion, and it can only be aimed at the wellbore, and it cannot be precisely sealed for multi-stage high-permeability sections; the process of cement extrusion and multiple injection is difficult and expensive, and only the skin of the reservoir is blocked to facilitate water channeling in the later stage ;The water-soluble chemical plugging agent deep plugging technology can be used for deep plugging, but it is difficult to select the plugging agent under high temperature and high salinity conditions, and it is not selective for the reservoir space. Multiple supporting measures before and after are expensive

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