Temperature-resistant salt-tolerate inorganic particle water-blocking agent

Abstract

The invention provides a temperature-resistant salt-tolerate inorganic particle water-blocking agent. The water-blocking agent comprises following components by weight: 55%-59% of a dry-material mixture sample and 1%-7% of a retarder, with the balance being water. The main component of the dry-material mixture sample is a mixture of cement and coal ash. The retarder is one compounds selected form a group of sodium lignosulphonate, modified sodium lignosulphonate, potassium lignosulphonate and modified potassium lignosulphonate, or a mixture of several compounds selected from the group. The curing time of the inorganic particle water-blocking agent is controllable and the compressive strength of the water-blocking agent is high. When being pumped into stratums by a high-pressure pump, the water-blocking agent can settle and cure in underground pores, thus blocking a certain well section or a water exit position. The water-blocking agent can have good effects for determining accurately the water exit position, or for blocking bottom water of parts need to be blocked and edge and bottom water of the parts need to be blocked, and is suitable for oil reservoirs having moderate and high permeability and various temperatures.

Description

technical field [0001] The invention relates to a plugging agent for oil well water plugging, in particular to a temperature-resistant and salt-resistant inorganic particle water plugging agent. Background technique [0002] Water production from oil wells is a common problem in water drive oilfields. For oil fields developed by artificial water injection, due to factors such as anisotropy of reservoir permeability, difference in oil-water viscosity, and unbalanced hydrodynamic field during development, the phenomenon of vertical single-layer intrusion and plane tongue intrusion of injected water will result, and oil well production will After a certain period of time, water will be seen, and the water content will continue to rise. For oil reservoirs exploited by natural water flooding, due to various geological production factors of the reservoir, after a certain period of production, the edge water and bottom water intruding into the reservoir will eventually break throu...

AI Technical Summary

Problems solved by technology

However, there are few reports on inorganic particle water shutoff agents used in fracture-cavity bottom water reservoirs.