PetroSkills: Formation Damage and Matrix Stimulation Core

it is a common occurrence for an oil and

gas operator organization to bring on a

well after initial Drilling and

completion or after a workover and

observe that the production rate is not

as expected if rates are greater than

expected there is some interest and

evaluation as to why and a study May

commence action is often limited to

observing possible rate decline say

waiting two or 3 months and then

assessing production performance but

this outcome contrasts greatly to the

scenario where initial production from a

newly started up well is less than

expected not accurately identifying the

correct cause or causes of less than

expected production will often lead to

costly remedial attempts that likely

will result in the failure to achieve a

Well's maximum productive capacity

conversely proper investigative studies

that lead to identification of true

formation damage will provide the

engineer with proven remediation tools

to regain well productivity if acidizing

a formation is chosen as a remediation

step to take the stimulation design

engineer must also understand corrosion

control iron control acid diversion Etc

to achieve Optimum stimulation results

poor corrosion control practices can

lead to catastrophic failure of well

completions Elemental iron is often

present throughout a reservoir lithology

and ignoring the effects of iron that

goes into solution during an acid job to

restore productivity can readily turn a

successful acid job into a failure this

is due to the precipitation of iron as

pH Rises during Flowback and cleanup

following an acid job if proper acid

diversion techniques are not properly

analyzed and designed as a fundamental

component of an acid job job the acid

pumped may just react the most permeable

portions of the reservoir thus leading

to job failure the chemistry of

limestone and Sandstone remedial acid

job treatments to restore production

differ greatly this proper rock

minerology identification and lab

testing with acid processes is mandatory

in restoring lost production properly

identifying formation damage and

applying remedial actions will provide

the opportunity to restore a well to its

maximum

productivity