Automated method for selecting oil producing wells to subsea demulsifier injection

Abstract

The present invention refers to automated method for the selection of oil producing wells that are candidates for subsea demulsifier injection, with application in mature fields after the start of water production, aiming at increasing oil and gas production and reducing the instability of the wells.

1 - AUTOMATED METHOD FOR SELECTING OIL PRODUCING WELLS TO SUBSEA DEMULSIFIER INJECTION, characterized by comprising the following steps:
 1. Evaluating the well production data;   2. Identifying the flow regime of the well in production between the injection point of the product and the surface;   3. Simulating the steady flow regime to quantify the oil production gain with the separation of the water-oil phases (without emulsion), using the updated representative model of the wed;   4. Simulating flow in a transient regime to evaluate the gain in flow stabilization with the phase separation (viscosity without emulsion);   5. Preparing the well for the injection of the demulsifying chemical specified for subsea injection and start the injection;   6. Performing the selection of the injected demulsifier chemical product and identifying the most appropriate dosage;   7. Optimizing surface demulsifier injection;   8. Monitoring the production and quality of water during the productive life of the well.   
     
     
         2 - AUTOMATED METHOD FOR SELECTING OIL PRODUCING WELLS TO SUBSEA DEMULSIFIER INJECTION, according to  claim 1 , characterized by the steps (1 to 5) of selection of the wells being automated in a tool web which reads information from the integrated production database (steps 1 and 2) and from the PI in real time, associates it with the simulation results (step 3 and 4), makes a check first of the method requirements and, through established calculation assumptions, informs the potential for oil gain with the application of the product. 
     
     
         3 - AUTOMATED METHOD FOR SELECTING OIL PRODUCING WELLS TO SUBSEA DEMULSIFIER INJECTION, according to  claim 1 , characterized in thar the wells that present the greatest potential for oil gain are those that produce stable emulsions (without free water), with high viscosity and with water content greater than 30%. 
     
     
         4 - AUTOMATED METHOD FOR SELECTING OIL PRODUCING WELLS TO SUBSEA DEMULSIFIER INJECTION, according to  claim 1 , characterized in that the well flow regime has a Reynolds number lower than 1×10 5  at the base of the riser. 
     
     
         5 - AUTOMATED METHOD FOR SELECTING OIL PRODUCING WELLS TO SUBSEA DEMULSIFIER INJECTION, according to  claim 1 , characterized in that the selection of the demulsifier chemical product for underwater injection is carried out by bottle test at temperature and flow time, between the injection point and the platform.