Bio-enzymes breaking rubber and fracture against harm technology
According to the bio-enzymes characteristic and mechanism of action, it can be widely used in solve the following issues:
1. Clear the drilling fluid pollution
During the drilling, the pollutant usually is the carbonate weighting agent, the polymer in the drilling fluid or the carbonate particles. It is difficult to clear these pollutants very effectively, especially in the lower permeability oil deposit.
The traditional method in China is the using strong acid, oxidant or the mechanical method to clear the pollutant, but these methods have many defects. Along with the biotechnology development, the bio-enzymes as the breaking rubber agent will clear the drilling fluid damage to the layer; without the traditional method some merits, it have been mature applied at overseas.
The bio-enzymes is different to the acidized and oxidized process, it only has the degradation ability to the special substrate, but no activation to others material. Therefore it can avoids and clear the side effects produced by using the acid or oxidant, such as the column corrosion and metal fragments pollution, etc. Meanwhile during the liquid injection process, due to the bio-enzymes reaction speed is lower than the chemical agent, it won’t occur the partial filter cake corrosion or loss into the layer phenomenon.
2. Bio-enzymes fracture breaking rubber agent
The waterpower fracture is one of operation for happening lots polymer harm. Input the breaking rubber agent in the fracture liquid during the fracture operation, that make the polymer freeze the rubber and crack, then the polymer macromolecule decompose the smaller molecule which can be discharged from the endokinetic fissure. If the polymer in the power fracture liquid can’t fully degradation, it will damage the diversion ability of the support agent filling layer and the original permeability in the layer, also cause the disposal well capacity descend by a wide margin.
Bio-enzymes as the breaking rubber agent have been used widely overseas. Bio-enzymes can make the polymer hydrolyze the smallest molecule. The crosslinking agent and polysaccharide polymer molecule size not influence the specificity enzymes degradation range to the objective polymer. In the suitable temperature and PH circumstances, even the very lowest enzymes thickness, it reaction time is long enough and can make the substrate polymer depredates to unimolecule material, so it reduce the harm to the polymer greatly. Compared with the traditional breaking rubber agent, even the bios-enzymes breaking rubber agent take part in the breaking rubber reaction, that the bio-enzymes itself can’t be consumed in the reaction process. The bio-enzymes can reaction for the long time under the catalytic agent action in the reaction process, that can utmost decrease the layer harm caused by fracture.
