Abstract
It was deemed important to calculate the thermal recovery production model of tight oil reservoirs after fracturing and packing based on the field data of an oilfield in Bohai Sea, China. The thermal recovery production of a tight oil reservoir after fracturing is demonstrated through theoretical calculation and practical field data on the premise of five hypotheses. Fractures change the fluid flow capacity of the reservoir. Combined with the relevant theories of reservoir thermal production, the dual porosity system in the fractured zone and the single porosity system in the unfractured zone were established. The calculation models of heat loss in the fractured and unfractured zones were derived to determine the thermal recovery heating radius of the reservoir after fracturing and packing. Combined with the pseudo-steady state productivity formula of the composite reservoir, a production calculation model of thermal recovery after fracturing and packing in the tight oil reservoir was established. The results showed that the heating radius of the reservoir after fracturing and packing is smaller than that of the unfractured reservoir, and the additional heat absorption of the fracture system generated by fracturing and packing reduces the thermal recovery effect. The thermal recovery productivity of heavy oil reservoirs is mainly affected by the heating radius. With the increase of fracture density, the heating radius decreases and production decreases. The increase of fracture porosity also leads to the decrease of the heating radius and the production. The calculation result of this model is improved after tight oil reservoir fracturing during the production period, which indicates that the model has a better prediction effect of the production of the tight reservoir after fracturing and packing.
Highlights
The recoverable reserves of global heavy oil are about 400 billion tons, 2.7 times that of conventional crude oil
Because the viscosity of heavy oil is sensitive to temperature and decreases rapidly with the increase of temperature, thermal recovery technologies such as steam flooding integrated with fracturing or other measures are adopted for the development of heavy oil
Compared with conventional heavy oil reservoirs, the characteristics of conventional heavy oil reservoirs and the influence of fractures after fracturing and packing should be considered during thermal recovery
Summary
The recoverable reserves of global heavy oil are about 400 billion tons, 2.7 times that of conventional crude oil. As an effective stimulation and sand control measure in tight in tight reservoirs, there has been no relevant study on the influence of proppant in hyreservoirs, there has been no relevant study on the influence of proppant in hydraulic draulic fractures on the subsequent thermal production capacity. A heat loss calculation model is derived and the heating radius of thermal recovery after reservoir fracturing and packing are determined. Incorporated with the pseudo-steady state statedeliverability deliverabilityequation equationofofthe thecompound compoundreservoir, reservoir, a production calpseudo-steady a production calcuculation model of the thermal recovery of the tight oil reservoir after fracturing and packlation model of the thermal recovery of the tight oil reservoir after fracturing and packing ing is established.
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