Novel complex surface active degradation agent used for releasing the blocking of Polymer/Surfactant flooding
A composite surface and surface active technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., to achieve the effects of long validity period, meeting the requirements of on-site construction, and extensive economic and social benefits
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[0034] Artificial rock core is used, the specification is Φ2.5cm×10.0~10.3cm, and the gas permeability is 335×10 -3 ~393×10 -3 μm 2 , the high-concentration (3500mg / L) polysurfactant prepared by using sewage was injected into the rock core up to 5PV to simulate formation blockage, causing about 80% of its pores to be blocked, and the composite surface-active degradation agents of various concentrations in Table 1 were used Blocking removal, under the condition of 45°C, the reaction time is 24h, the experimental results are shown in Table 2:
[0035] Table 1
[0036]
[0037] Table 2 Plugging removal experiment of polymeric surface agent plugged core (injection of polymeric surface agent 5PV, flow rate 1mL / min)
[0038] the rock
[0039] From all the examples, it can be seen that the composite surface-active degradation agent is used in tertiary oil recovery to remove plugging in flooding water wells with polysurfactants, and has the effect of unblocking ...
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