Water shut off technological process for viscous crude well

Abstract

The present invention relates to a thick oil well water shut off technological process for thick oil well water shut off layer and improving exploitation effect. The process bases on 'deep move shallow shut off' principal, first selectively shutting off the big diameter for the oil layer by degradable organic shut off additives, then sealing the opening by high temperature resistant inorganic shut off additives, and realizing selective water shut off by pressure control and degradation of organic matter. The water shut off process is reasonable in design, reliable in criterion, and has the characteristic of small construction risk, high success rate and long validity period compared with other thick oil well water shut off processes, and provides a new effective process for solving the water shut off problem for thick oil especially middle thick oil well.

Description

Technical field: [0001] The invention relates to a process for oil wells, especially heavy oil wells, to block water layers and improve production effects. Background technique: [0002] With the continuation of the oilfield development process, the water content of crude oil and the water production of oil wells continue to increase, which has a negative impact on crude oil production and production effects. Blocking the water layer and improving the production effect have become an important issue in the production of heavy oil wells. Since ordinary chemical water shutoff cannot withstand high temperature, the current conventional heavy oil water shutoff mainly adopts two methods: mechanical water shutoff and cement partition water shutoff. However, due to multiple rounds of huff and puff in heavy oil wells with steam injection thermal recovery, channeling outside the pipe often occurs, making it impossible to implement mechanical water shutoff, while cement diaphragm wat...

AI Technical Summary

Problems solved by technology

However, due to multiple rounds of huff and puff in heavy oil wells with steam injection thermal recovery, channeling outside the pipe often occurs, making it impossible to implement mechanical water shutoff, while cement diaphragm water shutoff is due to the cement solidification time and the fluidity of the cement slurry after dehydration in the formation. Influenced by factors such as variation, the plugging radius is small, the construction risk is high, and the effective time is short

In order to increase the plugging radius, a variety of high-temperature resistant inorganic plugging agents have been tested on site, but such plugging agents cause serious formation pollution, resulting in a significant decline in the throughput of oil wells, which cannot fully meet production needs