Question

Explain them:

Wireline perforation?

Tubing conveyed perforating?

Answer 1

Wireline (or electric line) is the traditional way to run perforating guns and with good reason: Wireline provides the advantages of real-time depth control and selectivity along with reduced logistics compared with deployment on tubing. Although wireline perforating guns were initially categorized by whether they are used before the completion is run (casing guns) or through the completion (through-tubing guns), today any type of engineered perforating system can be run on wireline along with a wide variety of other explosive devices.

TCP perforation , the perforation is deployed using Drillpipes or Production tubing or Coiled tubing , the good thing is that all perforations will see the same designed static underbalance , bigger gun sizes and higher shot densities can be deployed and same string of TCP can be used to run DST after perforation in case of exploration or in case of it is required to know well productivity prior to installation of completion ,in case of Shoot and drop TCP operations where gun is deployed on production tubing , this process can save rig time as long as rat hole is available to accomodate TCP string , the drawback of TCP is that it is required to Kill the well after perforation in order to Pull out of hole and run the completion, in case of shoot and drop you don't know if gun is fired completely unless you run with production log or downhole camera.