API RP 19B:2006 pdf download

API RP 19B:2006 pdf download.Recommended Practices for Evaluation of Well Perforators.
2.4.4 Pressure Vessel
The minimum inside diameter of the pressure vessel shall be 12 inches. Suitable pressure sensing and remote recording equip. ment shall be used to obtain a permanent record of the pressure protile for the complete test. All equipment nuist be calibrated against a suitable reference standard at intervals not exceeding six months.
2.4.5 MountIng of Core Target
The gun shall be sufficiently secured to the core target to assure correct clearance and alignment. If bolts are used to hold the shooting end fixture and vent tube end fixture to the core, the end fixture must be free to travel in the direction of the core so as to transmit the stress uniformly. The entire target shall be centralized (±1.0 inch) in the shooting vessel (refer to Figure 4).
2.4.6 PerforatIng Tool
The tool to he tested will be a single-shot section of the gun. This gun scction must he a duplicate of the field gun.
2.5 TEST CONDITiONS AND PROCEDURE
2.5.1 Chamber Fluid
The chamber fluid shall he waler and maintained at anìhient temperature throughout the test.
2.5.2 Clearance
With the exception of zero-phased perforators used with eccentering devices, bullet and jet perforators shall be tested at a clearance of 0.5 inch. Zero-phased perfurators used with eccentering devices shall be tested at the clearance assumed in a well.
2.5.3 Charge Selection and Aging
The required number of charges shall be samples taken uniformly from a minimum production run of 1000 RI)X or PFTN charges (a production run of only 300 charges is required for high temperature explosives) and packaged in the rnanufacturingl service company’s standard shipping containers. These charges shall be stored for a minimum of four weeks prior to testing to allow some aging to occur.
2.5.4 Number of Shots
Tests are to consist of a minimum of three shots made under stated conditions. Test shot results must he indicative of average performance expected from production charges.
2.5.5 Firing Pressure
The pressure vessel will be pressured to 3,0(X) psi. The system will be held static for 5 minutes befure shooting to check for leaks. If the core is fully saturated there should be a small fluid flow initially from the vent tube, until stress equalization occurs. The perforating gun is tired with a closed system. The pressure gauges and pumps are thus protected from the shock of firing.
2.5.6 DetermInation of Depth of Penetration
The depth of penetration shall be determined by the maximum depth from the exterior steel face plate to the end of the perforation tunnel, as determined by probing for weakened rock beyond the perforation tip.
2.5.7 Faceplate Hole Diameter
The hole diameter shall be measured along the short and long elliptical axes and reported along with the average of the two measurements. Such measurements shall be made from outside the faceplate with a caliper, whose amis readily pass through the perforation. Tbe short axis shall be the smallest through hole diameter measured. Hole diameter shall he reported to the nearest 0.01 inch.
3.2 REFERENCE DATA
A reference charge test shall be conducted at atmospheric pressure and ambient ternper.iture employing the steel target and the test described herein.
3.3 TEST TARGET
Tests shall be conducted with a laminated target consisting of mild-steel (ASTM A36) flat plates. I inch thick with a faceplate /8 inch thick. Cross sectional area of the plates shall be chosen for repeatable data collection. Typical target configuration is shown in Figure 8. The target thickness must be at least 0.5 inch greater than the average penetration depth recorded.
3.4 PERFORATING SYSTEM SELECTION
The perforating system to be tested shall consist o the gun associated hardware, and firing head. Production equipment (or specially modified hardware to the same specification) shall be utilized, including gun body. adapers, transfer subs, and explosive components. The free volume to explosive load ratio must be the same or less than a fully loaded field configuration gun: or previously established in a separate test by firing a minimum of one charge after holding at time and temperature at an equal or lower free volume to explosive load ratio for this explosive. For tubing conveyed systems, at least one transfer must be demonstrated on the same or a separate test utilizing a production transfer sub. At least one charge shall be tired subsequent to the transfer. For wireline conveyed systems. any electrical or mechanical switches shall be included if recommended by the service company for this application, unless previously qualified in a separate test.