Can you drill cement with PHPA mud?

Do not drill cement with PHPA muds, unless the system will be replaced after drilling out, because PHPA muds are sensitive to high pH, especially in the presence of high calcium levels. If drilling cement with a PHPA system is unavoidable, pretreat the system with 0.251bmlbbl [0.7 kg/m3] sodium bicarbonate.

What is the technology of PHPA mud systems?

Although more is known from field applications about how practices, although more is known from field applications about how the products work and the systems behave, the technology of PHPA mud systems is still developing. Drilling of oil and gas wells always results in the incorporation of native clays into the mud system.

How has PHPA mud changed the drilling process?

In wells drilled with PHPA mud, the number of bits was reduced from seven to two, rotating hours were reduced from 128 to 58, drilling progress was increased from 254 to 499 ftlD [77 to 152 mId], and total days were reduced from 12 to 6.

Can PHPA be used in laboratory mud?

However, we have used 1lbm/bbl [2.9-kg/m3] PHPA concentration in NaCI and KCl muds in mud weights> 18 Ibm/gal [>2160 kg/m3] successfully. Interestingly, laboratory muds prepared with 1.01bmlbbl [2.9 kg/m3] PHPA at 18lbm/gal [2160 kg/m3] are much too viscous to pump.

Can PHPA be added to salt mud?

We experienced one case in which PHPA added to a salt mud produced high permanent viscosity. In this case, the system had a mud weight of 15.6lbm/gal [1870 kg/m3], a chloride concentration of 125,000 mg/L, and a high concentration of filtration control additives.

Can PHPA mud be used offshore?

In North Sea applications, PHPA muds are being used offshore The Netherlands successfully and routinely. However, poor results were obtained in offshore Norway and U.K. applications because of formation reactions, inadequate mixing and solids-control equipment, and general inexperience with water-based muds.