I. Application of PAC in drilling fluid
Petroleum PAC is ideal for inhibitors and fluid loss additive because the mud fluid prepared by PAC can inhibit the dispersion and expansion of clay and shale in a high salt medium to control the wellbore pollution.
II. Application of PAC in workover fluid
The workover fluid prepared with petroleum grade PAC is of the low solid phase, which will not block the permeability of the production layer due to solids and damage the production layer. Moreover, it has a low water loss, which can reduce the amount of water entering the production layer.
i. The workover fluid prepared with PAC has the advantages that other workover fluids do not have.
ii. It protects the production layer from permanent damage.
iii. It has the carrying capacity of cleaning the well hole and reduces the workload of maintaining the well hole.
iv. It has the ability to resist water and sediment infiltration and rarely bubbles.
v. It can be stored or transferred from well to well, and its cost is lower than that of ordinary mud workover fluid.
III. Application of PAC in fracturing fluid
The fracturing fluid prepared with petroleum grade PAC can resist a 2% KCI solution (must be added when preparing fracturing fluid) and has good solubility. It is convenient to use and can be prepared on-site. Also, it has a fast gumming speed and strong carrying capacity. The fracturing effect is more excellent when it is used in formations with low osmotic pressure.