Recovery Method and Parameter Optimization of a Pilot Test for Conformance Control Flooding and Thermal Recovery in the Offshore Heavy Oilfield

Table 9

The experiment scheme and results of the combined operation.

Scheme	Steam injection velocity (t/d)	Shut-in time (d)	Steam injection quantity in a cycle (t)	Steam injection temperature (°C)	Cycle time of thermal fluid huff and puff (month)	Polymer concentration (mg/L)	Slug size (PV)	Interval time of polymer injection (month)	Production-injection ratio	Scheme result			Comprehensive evaluation index
										Accumulative oil increment (10^4 m^3)	Production-injection ratio	Recovery ration increment (%)
21	120	2	3500	260	9	2000	0.04	6	0.8	5.632	11.153	14.558	10.448
22	120	2	4000	265	18	3500	0.08	12	0.9	9.061	11.409	14.497	11.656
23	120	3	4500	275	9	2500	0.08	15	1	4.638	11.583	15.427	10.549
24	120	3	5000	270	18	3000	0.04	9	1.1	7.593	13.033	15.186	11.937
…	…	…	…	…	…	…	…	…	…	…	…	…	…
49	150	4	3500	265	9	2500	0.10	12	1.1	5.757	10.953	14.961	10.557
50	150	4	4000	260	18	3000	0.06	6	1	9.027	11.988	14.442	11.819
51	150	5	4500	270	9	2000	0.06	9	0.9	4.436	11.527	14.743	10.235
52	150	5	5000	275	18	3500	0.10	15	0.8	7.382	11.212	14.764	11.119