Cased Hole Electric Line Tools Wireline (cabling)

1 cased hole electric line tools

1.1 cement bond tools
1.2 casing collar locators
1.3 gamma perforating tools
1.4 wireline pressure setting assemblies (wlspa)

cased hole electric line tools
cement bond tools

a cement bond tool, or cbt, acoustic tool used measure quality of cement behind casing. using cbt, bond between casing , cement bond between cement , formation can determined. using cbt data, company can troubleshoot problems cement sheath if necessary. tool must centralized in function properly.

two of largest problems found in cement cbt s channelling , micro-annulus. micro annulus formation of microscopic cracks in cement sheath. channelling large, contiguous voids in cement sheath form, typically caused poor centralization of casing. both of these situations can, if necessary, fixed remedial electric line work.

a cbt gains measurements rapidly pulsing out compressional waves across bore , pipe, cement, , formation. compressional pulse originates in transmitter @ top of tool, which, when powered on surface sounds rapid clicking sound. tool typically has 2 receivers, 1 3 feet away receiver, , @ 5 feet transmitter. these receivers record arrival time of compressional waves. information these receivers logged traveltimes 3 , 5 foot receivers , micro-seismogram.

recent advances in logging technologies have allowed receivers measure 360 degrees of cement integrity , can represented on log radial cement map , 6-8 individual sector arrival times.

casing collar locators

casing collar locator tools, or ccl s, among simplest , essential in cased hole electric line. ccl s typically used depth correlation , can indicator of line overspeed when logging in heavy fluids.

ccl log

a ccl operates on faraday s law of induction. 2 magnets separated coil of copper wire. ccl passes casing joint, or collar, difference in metal thickness across 2 magnets induces current spike in coil. current spike sent uphole , logged s called collar kick on cased hole log.

gamma perforating tools

a cased hole gamma perforator used perform mechanical services, such shooting perforations, setting downhole tubing/casing elements, dumping remedial cement, tracer surveys, etc. typically, gamma perforator have sort of explosively initiated device attached it, such perforating gun, setting tool, or dump bailor. in instances, gamma perforator used merely spot objects in well, in tubing conveyed perforating operations , tracer surveys.

gamma perforators operate in same way open hole natural gamma ray tool. gamma rays given off naturally occurring radioactive elements bombard scintillation detector mounted on tool. tool processes gamma ray counts , sends data uphole processed computerized acquisition system, , plotted on log versus depth. information used ensure depth shown on log correct. after that, power can applied through tool set off explosive charges things perforating, setting plugs or packers, dumping cement, etc.

wireline pressure setting assemblies (wlspa)

setting tools used set downhole completion elements such production packers or bridge plugs. setting tools typically use expanding gas energy slow burning explosive charge drive hydraulic piston assembly. assembly attached plug or packer means of setting mandrel , sliding sleeve, when stroked piston assembly, squeezes elastomer elements of packing element, deforming sufficiently wedge place in tubing or casing string. completion packers or plugs have specially designed shear mechanism release setting tool element allowing retrieved surface. packer/plug however, remains down hole barrier isolate production zones or permanently plug off bore.