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PHPA

Discription

PHPA is a partially hydrolysed polyacylamide of medium molecular weight. PHPA is a water soluble encapsulating polymer which is used to stabilize hydratable and dispersible claystone. PHPA is supplied as a powder.

Application

PHPA can be added to water based drilling muds o its own or in combination with KCL, to inhibit shale bearing formation. Due to PHPA’s encapsulating property, clay and shale problems such as sloughing and bit balling are effectively prevened. PHPA reduce uncontrolled build up of colloid solid and thus ensures control of viscosity at high penetration rate. This effect of PHPA on viscosity, decreases in high salt concentration. PHPA loses it’s effectiveness at higher calcium and magnesium ion concentration. These bi – valent cations should be kept to minimum with Soda ASH.

Recommended treatment

PHPA is added to obtain good solids control and stability of the well bore and should be add on regular basis. Treatment of 1.5 to 10 kg/m3 (0,5 to 3,5 bbp) is normally adequate initially. The concentration of PHPA in system should normally be kept in excess at 0,5 to 1,5 kg/m3(0,2 to 0,5 ppb). Calcium should be kept below 200 mg/l.

Typical physical properties

Appearance………………… White powder

Activity…………………….30%

Bulk density…………………860kg/m3(53,5 lb/ ft3)

Solubility …………………………Readily in freshwater and saturated brines

Temperature stability, 0C……….1500C( 300 0F)

Safe handling recommendations

Utilize normal precaution for employee protection when handling chemical products.

Use of appropriate respirator gloves, goggles and apron is recommended for employee comfort and protection.

Shipping

PHPA does not have a restricted classification for transportation by the international or domestic regulatory agencies.

Packing

PHPA is packaged in 25 kg multi – wall paper sacks

 
 
 
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