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How does the polyacrylamide works in oilfield industry
How does the polyacrylamide works in oilfield industry?
A polyacrylamide flocculant used in tertiary oil recovery
Polyacrylamide flocculant thickening, flocculation and fluid rheology regulating effect on the performance have made it in the oil acts as an important role. It is widely used for drilling, plugging, water acidification, fracturing, wash well, completion, drag reduction, scale and drive oil regard. In general, the use of polyacrylamide flocculant to improve oil recovery rates (EOR). In particular, many have entered the field of secondary, tertiary recovery, reservoir depth of 1000m above generally in some reservoir depth of 7000m, heterogeneity and offshore oilfield in oil production operations to the proposed more stringent conditions, deep oil and offshore oil corresponding to PAM also raised new demands to shear resistance, high temperature (above 100 ℃ up to 200 ℃), resistance to calcium ion, magnesium ion, seawater degradation.
Second, the modifier used for water shutoff
In the oil production process, due to the heterogeneity of the formation, often produce flooding problems, the need for water shutoff, and its essence is to change the water flow in the formation of the state in order to reduce oil field produced water to maintain reservoir energy, improve oil ultimate recovery purposes. Polyacrylamide flocculant chemical class selective blocking agent of the oil and water infiltration capacity, reduced permeability to oil up more than 10%, while reducing the water permeability of more than 90%. Selective water shutoff feature that is not available to other blocking agent, usually according to the type of formation to select the appropriate molecular weight polyacrylamide. Good homogeneity, high average permeability of the reservoir, the choice of the relative molecular mass (. (500 ~ .700) × 10) polyacrylamide flocculant; bedrock low permeability fractured reservoir permeability changes or large the reservoir, the choice of high molecular weight (1000 × 10. above) polyacrylamide. When using polyacrylamide crosslinking may not use, but can generate aluminum, chromium salts, zirconium salts crosslinked gel use, you can add some mutual capacitance polymer resin to form a network, so that it has a higher temperature resistance. This method has been applied in water shutoff high water oil reservoirs in the country carbonate end, achieved remarkable results. Polyacrylamide can also be adjusted within the formation water injection profile and block large pores, the practice has achieved good results.
Used as a drilling fluid and fracturing fluid additives modifier
As drilling adjusting agent, often used partially hydrolyzed polyacrylamide (HPAM), which consists of polyacrylamide hydrolysis. Its role is to regulate the rheology of the drilling fluid to carry cuttings, lubricate the drill bit, reduce fluid losses. The proportion of the drilling fluid polyacrylamide modulated low, reduce reservoir pressure and clogged, easy to find oil and gas layer and facilitates drilling, drilling speed than conventional drilling 19% higher than the penetration rate is about 45% higher. Additionally, it can greatly reduce sticking accidents, reduce equipment wear and tear, and can prevent the occurrence of lost circulation and collapse.
As could be used as oil well cement additives, drilling fluid, completion fluids and workover fluid additives, oil field water treatment agent.
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