Two Plug Composite Wells Water Shutoff Technology

The oil well producing water is in the oil-field development process the universal existence question which influences the oil well production, the oil gas collection and transportation, oil-field development and so on seriously, specially regarding water drive (flood water, side water, bottom water) oil field. In the water mining later period, the oil well producing water is the inevitable phenomenon. For the reservoir quality's non-uniformity as well as the unsuitable development plan and the mining measure and so on which cause the water in longitudinal and on crosswise advances very the non-uniformity, creates the oil well premature flooding, the oil-field recovery ratio reduces. Therefore, in the oil-field water-injection's development, must promptly pay attention to the oil well producing water trend, use all kinds of measures to look for the water so as to definite the water leakage position and adopt the corresponding water plugging technology.The water plugging technology mainly divides into the machinery to shut off the water and chemistry shuts off the water two big kinds. Chemistry shuts off the water includes the selective water plugging and the non-selective water plugging. At present, the domestic and foreign chemistry shut off the water the mainly exist perquisite to shut off the water the working time with the level selectivity to be short and the low water plugging efficiency question. In view of the kind of present situation, Shengli oil field Gudao oil plants and SWPI cooperation, carries on "Two Plugs Compound Oil well Water plugging Technology Research" in the room the research and the craft technical design, has obtained the encouraging research results. Divided from the theory and the practice solves the perquisite to shut off the water the working time with the level selectivity to be short and the low water plugging efficiency question.Two plugs the compound water plugging technology of oil well uses the modified resin—gel as the first plug and seals off the oil well depth portion the channel. The plug should have the good selectivity, use stratum the oil stream and the fluent difference seals off the channel. But the first plug still has the shortcoming like the present organic selective plugging agent's. That is not reliable with the stratum wall surface adsorption. And it has the certain contraction, easily washes out under the different pressure function which reduces the water plugging term of validity and the water plugging efficiency. Therefore, we will pump the second plug for reinforcing the function of the first plug. The oil-field uses the compound permeable cement system against the migration of the...