Abstract
A water-soluble phenolic resin composite crosslinking agent was synthesized by the combination of water-soluble phenolic resin and metal ions promote cross-linking agent. The water-soluble excellent multi-methylol phenolic resin was synthesized by two-step method, followed by addition of an appropriate amount of metal ions to improve their gelling properties. The two-step method could promote the reaction of phenol and formaldehyde, so the main product was multi-methylol phenolic resin. The introduction of metal ions promoted cross-linking agent to make excellent gelling properties. This new kind of crosslinking agent was odor less, low toxicity, and efficient. Based on this kind of water-soluble phenolic resin composite crosslinking agent, the partially hydrolysed polyacrylamide showed good gelling properties. The minimum amount of cross-linking agent was 0.1% with high gelling strength; its gelation temperature could be adjusted from 60°C-120°C and its gelling time could be controlled between 8h and 48h. The stability of gel system was more than 60 days. The composite crosslinking agent has great prospects in the field of oilfield water shutoff profile.
Highlights
Polymer gel technology can effectively expand the sweep volume and increase the oil displacement efficiency [1,2]
hydrolyzed polyacrylamide (HPAM) uses the amide and carboxyl groups it takes to adsorb on the surface of the rock rich in hydroxyl, while the rest is left in space to block out the aquifer
The gel strength increased significantly, about 20000mPa s. This is due to the rapid complexation of metal ions and carboxylic acid groups in the form of coordination bonds; and phenolic resin crosslinking agent and polyacrylamide amide crosslinking are combined in the form of covalent cross-linking, complexing crosslinking and chemical crosslinking cooperate with each other, which lead to speed up the crosslinking effect
Summary
Polymer gel technology can effectively expand the sweep volume and increase the oil displacement efficiency [1,2]. Due to the large amount of the crosslinking agent, it is easy to cause pollution to the environment, and it is susceptible to the influence of salinity It is restricted in use [13,14]. The main components of organic phenolic compounds are phenol and formaldehyde, which can be combined with carboxyl group by covalent bonding to network structure. It is common used because of its controllable crosslinking speed, better stability of gel. The composite crosslinking agent compared with the conventional phenolic resin crosslinking agent, it has long shelf life, without excitant odour, low toxicity, gelling time shorter, gel strength, gel stability is better, a wider range of applicable temperature and the concentration and can be widely used in oil field water shutoff profile control field
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