Abstract
This paper presents a field study of reperforation on three vertical oil producers wells suffering poor reservoir quality by combining deep penetration charges guns with propellent materials. Perforation charges will form the perforation tunnel and secondly the burning of the propellent material will create high gas pulse that will go through the perforating tunnels and create near wellbore fractures to overcome the near wellbore damage and improve communication with the reservoir and hence improve productivity.
Propellent simulations were carried out and results show the ability to create fractures and the estimated fracture lengths would extend beyond the wellbore damage, improving the communication between the formation and the wellbore. The propellent is in the form of sleeves installed and secured over the conventional gun carrier loaded with deep penetration charges. When the guns are detonated, the sleeve charge is ignited and instantly producing a burst of high-pressure gas which goes through perforating tunnels to generate fractures near the wellbore. The perforating job was designed with the wells on balance to enhance their productivity. The guns with propellent sleeve were successfully deployed in the wells with downhole pressure transient recorded using fast-recording pressure gauge.
After this work on Well-1, Well-2 and Well-3, several months of production monitoring of those wells show the success of the technique and demonstrate an area of applicability in such mature, low pressure reservoir suffering from near wellbore damage. The simulation of the work and how the actual gauge job data matched the simulation have been an important factor in the success in enhancing the well real performance.
