초록 ▼

Improved techniques are provided for controlling the injection of a cellulose powder/water mixture input into a formation through an injection well for recovery of hydrocarbons. The initial dosing rate of powder added to the water is increased as a function of both the monitored pressure of the mixt

Improved techniques are provided for controlling the injection of a cellulose powder/water mixture input into a formation through an injection well for recovery of hydrocarbons. The initial dosing rate of powder added to the water is increased as a function of both the monitored pressure of the mixture in the wellbore in the vicinity of the formation, and the monitored flow rate of the injected mixture. The water flow rates and the flow dosing rates are optimised, and the mixture is controlled to obtain setting within the formation to enhance the recovery of hydrocarbons. A mixing tank is designed to prevent premature setting of the mixture. Portable equipment is provided for injecting the powder/water mixture into the formation, thereby increasing the versatility of the equipment reducing the overall costs of the recovery operation.

대표청구항 ▼

[ What is claimed is:] [12.] A system for controlling the injection of a powder/water mixture through an injection well and into a formation for recovery of hydrocarbons, the system comprising:a mixing tank for mixing a selected initial dosage rate of powder with water to form an initial powder/wate

[ What is claimed is:] [12.] A system for controlling the injection of a powder/water mixture through an injection well and into a formation for recovery of hydrocarbons, the system comprising:a mixing tank for mixing a selected initial dosage rate of powder with water to form an initial powder/water mixture ratio;a pressure sensor for monitoring the pressure of the mixture in the well bore;fluid control means for maintaining a desired flowrate of the mixture into the injection well;a flowmeter for monitoring the flowrate of the mixture injected into the injection well; anddosage control means for automatically increasing the selected initial dosing rate of powder at a rate functionally related to the monitored pressure and the monitored flowrate. [22.] A method of recovering oil from a hydrocarbon field, which method includes delivering a mixture of a gel-forming material and water downhole so that the gel-forming material hydrates to form a viscose gel after deliver, injecting water into one or more injection well, and recovering an oil/water mixture from a production well, characterized by monitoring the back pressure of the gel-forming material and water mixture and varying in response thereto the concentration of the gel-forming material in the mixture to vary the viscosity of the gel downhole.