| Carbonate is an important oil and gas reservoir, which the main feature is also a kind of fractured reservoirs. Our Tahe Oilfield is a kind of typical carbonate fissure cave reservoir. Nowadays waterflood development has become the most common way to develop the fractured reservoirs, however there are all kinds of problems taking waterflooding to develop the reservoir. how to improve water injection utilization, reduce water channeling between the water wells with the oil wells deserve our to study. This paper based on the data fields fractured, fractured interior design templates developed, based on the principle of different tracer production monitoring rule to judge the combinations fracture and cavity. On the basis of reservoir conditions suitable blocking agents were studied and analyzed layout orientation blocking agents. Completed the following studies:(1) Through the indoor physical model experiments analysis of tracer concentration change under different combinations of fractured situation analysis, acquire the rule of tracer production under different combinations of stitch holes;(2) According to the characteristics of high temperature and salinity reservoirs, develop an crosslinking in situ polymerization gel blocking agents, and to determine the appropriate blocking agent formulation components.(3) Based on the characteristics of reservoir of high temperature and high salt, developed a kind of easy pumping,appropriate gel time, gel strength, controllable high sealing ability strong, resistant to high temperature and high salinity, erosion resistance in situ copolymerization crosslinking gel plugging agent, and the formula of the plugging agent suitable.(4) Take blocking agents to evaluation with the core physics simulation. The single core flow experiment results show that the gel plugging agent on different permeability, fracture width slit channel has strong ability of plugging;(2) after30PV injected water, core plugging rate changed little, with good abrasion resistance;(3) the double core flow experiment results show that the gel plugging agent has good selective injection, have preferential access to large cracks, the crack closure rate reached98%.(5) In accordance with fractured own characteristics, due to the effects of lead water injection wells corresponding shutoff research, which mainly blocking agent caulking not plugging holes as the fundamental starting point, analyzes and summarizes the situation under different combinations of stitch hole layout orientation blocking agent.Indoor carbonate fracture cave reservoir tracer monitoring, aimed at determining the relationship between connectivity between injection and production wells to provide a theoretical basis for oilfield tracer monitoring, thus providing technical support to improve water flooding effect. |
