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→Reasons for workovers
==Reasons for workovers==
==Reasons for workovers==
[[file:workovers_fig1.png|thumb|{{figure number|1}}Components of a well.]]
file:workovers_fig1.png|{{figure number|1}}Components of a well.
file:workovers_fig2.png|{{figure number|2}}Horizontal cross section of a well.
[[file:workovers_fig2.png|thumb|{{figure number|2}}Horizontal cross section of a well.]]
Workovers may be required for one or more of the following reasons:
Workovers may be required for one or more of the following reasons:
* Lease requirements
* Lease requirements
* Abandonments
* Abandonments
[[file:workovers_fig3.png|thumb|left|{{figure number|3}}Casing repair via squeeze cementing.]]
The majority of workovers are done because the well is not performing up to expectations (see [[Production problems]]). Careful analysis will determine if the decline is abnormal or the result of normal reservoir depletion. If deemed abnormal, it must be determined if the problem is in the reservoir inflow system, the wellbore outflow system, or both. Inflow problems can be corrected with [[stimulation]] procedures such as acidizing, fracturing, scale, or paraffin treatments (see [[Stimulation]]) or by reperforating or additional perforating. Outflow problem resolution may require equipment changes, cleanouts, or chemical treatments.
The majority of workovers are done because the well is not performing up to expectations (see [[Production problems]]). Careful analysis will determine if the decline is abnormal or the result of normal reservoir depletion. If deemed abnormal, it must be determined if the problem is in the reservoir inflow system, the wellbore outflow system, or both. Inflow problems can be corrected with [[stimulation]] procedures such as acidizing, fracturing, scale, or paraffin treatments (see [[Stimulation]]) or by reperforating or additional perforating. Outflow problem resolution may require equipment changes, cleanouts, or chemical treatments.