WebJul 1, 2004 · PURE perforating is a patented method developed by Schlumberger employing a dynamic underbalance to remove perforating debris, minimise crushed zone damage … Web1.1.7 Underbalance and overbalance pressure. ... When perforating fluid contains solid particles, the solid particles will enter perforation channels or microfractures under overbalance pressure and plug or even fill up the perforations. The smaller solid particles may enter the reservoir through perforation channel walls, and formation damage ...

PURE Clean Perforations System Dynamic Underbalance …

WebMar 13, 2013 · Dynamic-underbalance (DUB) perforating is a completion technique that uses a perforating system engineered to create a rapid underbalance immediately upon … WebAn enhanced technique known as dynamic underbalanced (DUB) perforating creates a negative pressure differential or underbalance, causing fluid to move toward the wellbore, even in an initial overbalanced static condition. DUB is important to create open, undamaged perforations and optimize well productively. binary to json converter

Overbalance Pressure - an overview ScienceDirect Topics

WebThis variation in wellbore pressure is reflected in relation to the transient underbal-ance, and it is the maximum dynamic underbalance—not the initial underbalance—that governs perforation cleanup. Figure 56 shows the results of Tests 1 through 4 with the same charge and starting at an ini-tial underbalance of 1,000 psi. Web40650 Hurley Lane, Paeonian Springs, VA 20129 Phone: (540) 882-4404 - Fax: (540) 882-4190 [email protected] WebSep 12, 2005 · A new approach produces a well dynamic underbalance (the transient underbalance just after creating the perforation cavity). By basing the job design on the properties of the reservoir, wellbore, and gun string, the technique consistently minimizes perforation damage and thus maximizes productivity. binary to marie assembly language