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API RP 19B-2006 pdf free download

API RP 19B-2006 pdf free download.Recommended Practices for Evaluation of Well Perforators.
1.2.1 Target Preparation Concrete for the target and test briquettes shall be mixed using a cement-sand-slurry consisting of the following: a. 1 part or 94 lb of API Class A or ASTM Type I cement. b. 2 parts or 188 lb ±1% of dry sand. (The sand shall meet API RP 56, Second Edition requirements for 16 – 30 frac sand. The sand shall be stored in a dry location prior to use.) c. 0.52 part or 49 lb ±1% of potable water. d. The ratio of sand to cement shall be between 2.02 and 1.98. The ratio of water to cement shall be between 0.5252 and 0.5148. 1.2.2 Required Documentation Each distinct quantity of concrete (truckload or similar) used in the preparation of a target must include a written report from the concrete supplier listing the actual amounts of cement, sand, and water used. Quantities shall be reported in the units utilized during the measuring process, with no conversions or adjustments. The testing company shall maintain supporting documentation that the sand complies with API RP 56 for 16 – 30 frac sand. At a minimum, this shall consist of sieve analysis data for all loads of frac sand received by the concrete supplier. The testing company shall maintain supporting documentation that the casing used in the construction of the target meets the reported grade and weight. 1.2.3 Target Configuration The shape of the outer target form shall be circular and the size determined by the shot pattern and anticipated penetrating capability of the perforating system to be tested. Positioning of the tubing or casing within the target shall be determined by the gun phasing used in the test. For zero-phased perforators, the casing or tubing shall be set in the target form such that a minimum of three inches of the specified concrete composition surrounds the tubing or casing in all directions.
1.2.4 Target Curing Conditions The target shall be allowed to cure at a temperature within the concrete greater than 32°F (0°C) for a minimum of 28 days. The top surface of the concrete target shall be covered continuously during the entire curing period with a minimum of three inches of potable water. All strength test specimens shall be kept immersed in water at the same temperature as the concrete test target until they are used. 1.2.5 Target Compressive Strength Evaluation Target compressive strength shall be evaluated using 2-in. cubes (briquettes) made from the same concrete as the target, prepared and tested as prescribed in 1.2.1 through 1.2.5. Prior to or within 24 hours after conducting a test, the briquettes shall be tested and must have an average compressive strength of not less than 5,000 psi. Compressive Strength Evaluation Apparatus The molds shall not have more than three cube compartments. The parts of the molds when assembled shall be positively held together. The molds shall be made of hard metal, not attacked by the cement mortar, with a Rockwell hardness number not less than 55 HRB. The sides of the mold shall be sufficiently rigid to prevent spreading or warping. The interior faces of the molds shall be plane surfaces and shall conform to the tolerances in Table 1. A base plate having a minimum thickness of 1 / 4 in. shall be used. Preparation of Molds Apply a thin coating of release agent (aerosol lubricant for example) to the interior faces of the mold and contact surface of the base plate. Wipe the mold faces and base plate with a cloth as necessary to remove any excess release agent and to achieve a thin, even coating. Seal the surfaces where the halves of the mold join by applying a coating of light grease. The amount should be sufficient to extrude slightly when the two halves are tightened together. Remove any excess grease with a cloth. After placing the mold on its base plate (and attaching with clamps if applicable), apply grease to the exterior contact line of the mold and base plate to achieve a water tight seal. Placing Slurry in Molds The slurry sample shall be procured midway during the target pour. For large targets requiring multiple concrete trucks, the sample shall be taken from the truck filling the middle portion of the target. Preparation of the specimens shall begin within 15 minutes of procuring the sample. Stir the slurry by hand using a non-absorbent spatula or puddling rod to minimize segregation. Place slurry in each specimen compartment in the prepared molds in a layer equal to one-half of the mold depth. The slurry shall be placed in all the specimen compartments before commencing the puddling operation. Puddle each specimen 25 times using a glass or noncorroding metal rod approximately 8 in. long by 1 / 4 in. in diameter. After puddling the layer, the remaining slurry shall again be stirred. Fill the molds to overflowing and puddle as with the first layer. After puddling, the excess slurry shall be struck even with the top of the mold, using a straightedge. Specimens in molds which show evidence of leaking shall be discarded. For one test determination, not less than six specimens shall be prepared.

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