The Research Of Selective Water Shutoff Agent In Horizontal Well

The most striking drawback of horizontal well is easing to produce perceptible water for its horizontal hole with oil reservoir, and then leads precipitous rising of water cut, the most serious result is watered producer. Now, the water shutoff agents of horizontal well mainly are those agents used in conventional wells, the evaluation and testing ways are similar too, the effect of water shutoff is not well. How to improve the water shutoff effect in horizontal well is a important question that we meet in horizontal water shutoff area. According to the geologic section of horizontal well in No.10oil sub-company of daqing oilfield, this article we mainly researched on such two sides:the first is get out a kind of synthetic oil-soluble colophony, adding it into selective water shutoff gum system to improve stability and effect of water shutoff agent, and it can get effect of temporary shield shutoff on reservoir. The second is optimized the dispensation of water shutoff agent and the molecular weight of polymer, and determined using high molecular weight polymer to improve stability of water shutoff gum and shutoff ability to bottom water coning in horizontal well.