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"Plastisoft™ Perforation combined with bottomhole chemical treatment;

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Combined Plastisoft™ Perforation Process

To do a combined Plastisoft™ well Perforation job a workover crew is required with a standard set of equipment and a pump truck. The perforator is run into the targeted treatment interval on tubing and gets tied to the geological cross-section by logging methods.

Next, the pump truck exerts initial pressure of 10 atm on the wellhead, thus setting the perforator into the work position; the tool’s mill-disks get pressed to the production casing from inside. As the tubing and perforator move up and down along the treated interval, the pressure in the tubing line keeps growing, the mill-disks pierce the production casing wall and get outside it forming up lengthwise diametrically opposed slots. In distinction to other similar technologies, as the tubing and perforator continue moving up and down along the treated interval, a special working lateral surface of the mill-disks physically impacts edges of the newly-cut slots, milling them and preventing the slots from closing, providing in this way a high quality of the production casing opening-up.

Next the perforator’s fluid jets at the high pressure of 150-300 atm wash out the cement column and adjacent rock making caverns in the wellbottom zone up to 1.5 ft deep, depending on the formation geological structure. If required, the lengthwise slots can be oriented as per set azimuth. The azimuth orientation is carried out through standard logging methods at high accuracy.

Interpretation result of the SAT method during quality checkup of the Plastisoft perforation	Casing cut by a combined Plastisoft perforator (external view)	Casing cut by a combined Plastisoft perforator (inside view)

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