Down-hole pressure monitoring system

A chemical injection system for a well production string comprising:

• a) a chemical injection system comprising a chemical reservoir and a primary chemical injection pump connected thereto;
• b) a capillary tubing string connecting the chemical injection system to at least one injection mandrel having a check valve therein located within the production string;
• and
• c) a computer means associated with said chemical injection system for regulating, and maintaining a chemical fluid pressure on the check valve equal to varying pressures of the well production flow stream thereby establishing and maintaining a near zero differential across the check valve, the computer further having program means for comparing the chemical pressure fluctuations to historical data and adjusting chemical pressure and flow to override the check valve and enter the production string as necessary to ensure proper well flow charterristics.

A method for obtaining useful real time bottom-hole oil and gas pressure fluctuations from a production well by monitoring a chemical injection system pressure comprising the steps of:

• a) installing a chemical injection system on a production oil and gas well comprising:
• i) a chemical injection system comprising a chemical reservoir and a primary chemical injection pump connected thereto;
• ii) a capillary tubing string connecting the chemical injection system to a ported injection mandrel having at least one double check valve therein located near the lowermost point of the production string extending down-hole;
• iii) a supplemental pump means associated with the chemical injection system for regulating and maintaining a static pressure on the check valve in a manner whereby chemical pressure on one side of the check valve is equal to down-hole oil and gas pressure on the opposite side of said check valve;
• and
• iv) a computer comprising means for monitoring and recording down-hole well pressure fluctuations by monitoring chemical pressure fluctuations, performing analytical analyzes and comparing instant by instant recorded data with previously recorded data sets and automatically controlling the injection system for real time chemical injection adjustments based on the analytical analyses;
• b) pressurizing the chemical injection system and adjusting the supplemental chemical pump to maintain pressure on a chemical, acting on one side of the check valve, equal to the well pressure on the other side of the check valve;
• c) monitoring the chemical injection system and periodically adjusting and recording chemical pressure changes resulting from well pressure fluctuations;
• and
• d) applying analytical data correction formulas to the pressure changes to derive a more accurate picture of the well production characteristics.