New technology for recovering production and increasing production of shut down wells in pgz oilfield

Abstract

The invention provides a PGZ oil field abandoned well exploitation recovery and production increasing novel technique, aims to improve crude oil recovery exploitation degree and greatly improve well yield and change abandoned dead oil field with high water content into living oil field capable of producing oil base on operation and construction treatment. According to the PGZ oil field abandoned well exploitation recovery and production increasing novel technique, a slowly expanding selective water plugging technique and a slowly expanding selective water plugging fixing technique with high plugging intensity, good stability, long effective period and no perpetual harm to stratum are adopted and a critical novel technique enabling fluid to steering flow is introduced. The dominant mechanism of the fluid steering flow technique is that water in high pressure water layer leaks into matrix oil layer at the presence of a steering agent and crude oil in the matrix oil layer is driven to flow to a shaft bottom under flow pressure difference, so as to be exploited.

Description

technical field [0001] The invention belongs to the technique of increasing oil recovery in oil field exploitation, in particular adopting a profile control and plugging technique utilizing novel slow-swelling particles, microscopic flow direction changing agent and slow-swelling fixed changing agent. Background technique [0002] In order to further improve the recovery rate of water flooding in the water cut period, since the 1950s, people have adopted profile control and water shutoff technologies such as adjusting the water absorption profile and redirecting fluid in deep oil layers. The research on the corresponding profile control and water shutoff reagents and their systems has also attracted the attention of many petroleum workers and researchers. In view of the actual situation that many oil wells in most oilfields are shut down due to excessive water flooding, and the remaining underground oil cannot be recovered, efforts to develop a plugging agent with excellent ...

AI Technical Summary

Problems solved by technology

Water plugging with polyacrylamide is still considered to be the most classic and commonly used technical method in oil fields, but its application is limited due to its poor temperature resistance and salt resistance, easy degradation, and damage to the formation to varying degrees

Although the emergence of various cross-linked polyacrylamide systems has improved its temperature resistance and salt resistance to a certain extent, however, the inorganic cross-linking agents used such as potassium dichromate, aluminum citrate, various chromium salts, etc. There is a certain pollution to the environment. At the same time, in order to improve the gel strength, adding a large amount of cross-linking agent will also cause premature dehydration of the polymerized gel. These phenomena have attracted the attention of oilfield workers and researchers.

As the comprehensive water content of my country's water injection development oilfields continues to rise, the difficulty of water plugging and profile control is becoming more and more difficult, and the amount of original water plugging and profile control agents is gradually increasing or the effect is getting worse.

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