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→Problem prevention and correction
==Problem prevention and correction==
==Problem prevention and correction==
[[Table 1]] summarizes potential rock fluid reactions based on knowledge of clays present, damage prevention, and corrective procedures.<ref name=Kersey_1986>Kersey, D. G., 1986, The role of petrographic analyses in the design of non-damaging drilling, completion, and [[stimulation]] programs: Society of Petroleum Engineers Paper No. 14089.</ref> Prevention is preferred and, when possible, is likely to cost less than correction.
[[Table 1]] summarizes potential rock fluid reactions based on knowledge of clays present, damage prevention, and corrective procedures.<ref name=Kersey_1986>Kersey, D. G., 1986, The role of petrographic analyses in the design of non-damaging drilling, completion, and [[stimulation]] programs: Society of Petroleum Engineers Paper No. 14089.</ref> Prevention is preferred and, when possible, is likely to cost less than correction.''
{| class = "wikitable"
|-
|+ {{table number|1}}Rock-fluid potential problems, prevention, and corrective action
|-
! Potential Problem || Contributing Minerals || Damaging Fluids and System || Damage Prevention || Damage Correction
|-
| Clay swelling (water sensitive) || Smectite lllite-Smectite Chlorite-Smectite lllite Kaolinite || Fluids and System Freshwater-based fluids Any water with inadequate concentration of cations || Oil-based mud Potassium Ammonium chloride Calcium chloride || Preflush with HCl and NH<sub>4</sub> CI HCI/HF acidize Postflush with NH<sub>4</sub> CI and clay stabilizer
|-
| Fines movement (rate sensitive) || Kaolinite lllite Chlorite lllite-smectite Chlorite-smectite Clay size particles of quartz or other minerals || High transient pressure High flow rates || Perforate slightly under-balanced (1000 psi) Increase well rate slowly Maximize perforations per ft Select rate less than critical velocity Use clay stabilizer || Preflush if needed with HCl and NH<sub>4</sub> CI Acidize with HCI/HF Postflush with NH<sub>4</sub> CI and clay stabilizer
|}
===Laboratory tests===
===Laboratory tests===