Method for completion, maintenance and stimulation of oil and gas wells
A method for inducing motion in solid particulates in a solid/liquid mixture located in proximity to the periphery of a wellbore or in the formation zone adjacent to a wellbore in an oil or gas formation. The method includes introducing a gas impulse device into the wellbore. It then requires firing the gas impulse device so as to generate impulses of high pressure compressed gas, thereby to produce pressure waves within the wellbore and its surrounding formation. This causes motion of the solid particulates which permits settling and/or redistribution of the solid particulates. In some cases it even causes particulate flow, as in cold heavy oil production with sand (CHOPS). The method also frees blockages caused by the solid particulates and stimulates productivity. The method may inter alia be used in gravel pack construction and maintenance, well cementing operations and in CHOPS stimulation.
1. A method for stimulating production in cold heavy oil production with sand operations in an oil laden sand formation, the method including the following steps:
introducing a gas impulse device into a wellbore up to a depth whereat oil laden sand is present in the formation adjacent to the wellbore;
firing the gas impulse device periodically so that the device generates impulses of high pressure compressed gas and the pressure waves therefrom generate vibrations which dislodge the oil laden sand trapped in perforations of the wellbore and blockages of oil laden sand flow in the formation, improving flow of the oil laden sand into the wellbore; and
pumping the oil laden sand that has flowed into the wellbore, thereafter to effect the separation of the oil from the sand, said step of pumping occurring while said step of firing is executed.