Water-soluble And Oil-soluble Paraffin Remover And Inhibitor Development And Applications

The paraffin removing and inhibiting techniques that common used in oilfield are just such following six kinds of: mechanical paraffin removing technique, thermo paraffin removing and inhibiting technique, surface energy paraffin inhibiting technique(inside lining and coating tubes), chemical paraffin removing and inhibiting technique, magnetic paraffin inhibiting technique, microbiological paraffin removing and inhibiting technique. Using chemicals to remove and inhibit paraffin, we can get such effects as pour point depression, viscosity reduction and unplugging, with some chemicals. The two kinds of paraffin removing and inhibiting chemical compounded in room are mainly combined from two kinds of nonionic surfactants, in another word; they are combined from 1# surfactant and 2# surfactant. At the same time, adding other surfactants into the system for making the chemicals have paraffin removing, inhibiting and viscosity reducing effects. The 1# surfactant use self-made N-204 as initial agent, and is compounded through the copolymerization among double mental cyanide catalyst(DMC) , ethylene oxide and propylene oxide. Controlling reaction conditions, we can compound out different surfactants with different molecular weight and different molecular weight distribution, and so to observe and study the effects of some factors to the molecular weight and molecular weight distribution of the surfactants, such as the kind of assistant catalyst and main/assistant catalyst mole ratio. At the same time, we can compute the molecular weight and molecular weight distribution of the compounded surfactants and then observe and study the effect of surfactants molecular weight and molecular weight distribution on viscosity. The 2# surfactant takes polyethylene poltmine as initial agent. Choosing calcium acetate as catalyst and make copolymerization with ethylene oxide, propylene oxide, we can compound out highly branched polyether. The gel permeation chromatography (GPC) experiment shows that the molecular weight distribution of polyether taking calcium acetate as catalyst is comparatively narrow.Using water basing paraffin removing and inhibiting chemicals on the four oil samples in this experiment, to the regions corresponding with F126-86, 150-52, the formula is: 10%1# surfactant+12.5%2# surfactant +l%viscosity reducing chemical PAE+10%methanol, the rest is water. To 100-56, the region corresponding with the oil sample without label, the formula is: 12.5%1# surfactant+12.5%2# surfactant+l%viscosity reducing chemical PAE+10%methanol, the rest is tap water. We keep the total concentration of surfactants on .25%, to the oil sample whose water content is over 30%, when the chemical adding amount is 100ppm, paraffin-inhibiting ratio is over 60% and the viscosity-reducing ratio is over 40%. Using oil basing paraffin removing and inhibiting agents, the formula is: 2%1# surfactant+2%2# surfactant+1% viscosity reducing chemical, the rest is xylene. In this formula, the total concentration of surfactants is 5%. To the oil samples whose water content is between 0~50%, when the chemical adding amount is 2%, paraffin inhibiting ratio is over 50% and viscosity is over 30%. To the four oil samples in this experiment, the adding amount of water basing paraffin removing and inhibiting agent is 100 ppm, the adding amount of oil basing paraffin removing and inhibiting agent is 2%. With such adding amount, paraffin inhibiting ratio and viscosity reducing ratio can all get to the required standard. Dynamic paraffin inhibiting experiments show that: because oil is in the state of flowing, dynamic paraffin inhibiting ratio is higher than static paraffin inhibiting ratio apparently. Paraffin depositing experiments show that: the depositing amount of paraffin decreases apparently after adding paraffin removing and inhibiting agents.On-spot tests show that: to the wells whose load is normal and submergence depth is shallower than 100m, comparing with cyclic chemical adding, droplet adding can make load and load ratio decrease and can also m...