Weak Gel Profile Control Agent, And In Nine Oil Extraction Plant

Weak gel profile controlling and oil-displacing system is just such a kind of system: using polymers whose concentration is a little higher than polymeric displacing concentration, and adding little delaying cross-linking agent into it, make it be weak gel slowly in stratum. One side, weak gel has some intensity, and can produce some sealing to the high osmotic channels in stratum making succeeding injecting water flow to mid-low osmotic layers, so getting profile controlling. Another side, because the cross-linking intensity is not high, weak gel in the high osmotic channels can also move to the deep stratum slowly under the pushing of the succeeding water and produce oil displacing consequence as same as polymeric displacement. Such dynamic conformance consequence is far better than the conformance consequence of regular gel, so can enlarge swept volume and enhance oil productivity on more extent.The article screened out the best formula of gel solution: polyarylamid content is 0.3%, phenol content is 1.1%, cross-linking agent content is 1.2%, adjusting agent content is 0.4%. In such kind of formula, the gelation intensity of gel solution is comparative high; the gelating time is comparative long. The gelation intensity of gel solution is increasing ana the gelating time is getting shorter with the increasing of cross-linking agent content (other indigent contents are not changing). The gelation intensity of gel solution is increasing and the gelating time is getting shorter with the increasing of phenol content (other indigent contents are not changing). The gelating time is getting shorter with the increasing of adjusting agent content (other indigent contents are not changing), but such change has litter influence on the gelation intensity of gel solution. The gelation intensity of gei solution is increasing and the gelating time is getting shorter with the increasing of temperature (other indigent contents are not changing). The reaction between phenol and methonal cross-linking agent cause the cloudiness appear obviously in the gel solution long before gelating. But filtering experiments and core displacing tests show that the existing of phase separating substances has little influence on the sweeping and inputting ability of gel solution, and the influence is not worth mentioning.Weak gel not only can produce sealing, but also can move to the deeper stratum slowly along high osmotic layers under the pushing of succeeding water. It can enlarge swept area and enhance oil-displacing efficiency, improve exploiting consequence. Weak gel profile controlling and oil-displacing agent has comparative good selectivity on permeability, it prefer to move into high osmotic large channels and those move into low osmotic channels are very little.On-spot tests show that taking weak gel profile control on deep stratum in peripheral oilfields is viable and the prospecting of popularizing using is good. First, looking from stratum conditions, air permeability is over 87X10-3 m2, porosity is over 20%, the pay thickness of single layer is over 0.8m, the sand developing area is large, high water displacing controlling oil layers can all use this technique. Second, looking from water inputting wells, the common well's'can also get comparative good consequence after profile control, such wells can't achieve of profile control respectively on each layer. Through weak gel profile control, the contradictions between layers, on plane, or in layers containing of oilfield exploitation can be resolved successfully, oil productivity can be enhanced by over 2%.