Abstract
The SD107 gel system developed has good oil–water phase selective gelation and oil–water phase selective blocking properties. The static gel-forming experiment results showed that the gel water shutoff system formulated with oilfield reinjection water (oil content < 0.05%) has a viscosity of 200 mPa·s after gelation, and the gel water plugging system formulated with oilfield produced fluid (oil content ≥ 20.0%) had a viscosity of 26 mPa·s after gelation. Results of the core physical simulation experiment indicated that the enhanced recovery rate was the highest (34.6%) when the resistance ratio of the high-low permeability core was about 10.0 after plugging. As per the fluid volume (Q) of the oil well to be blocked, the maximum production pressure difference (∆P) was predicted, and on the basis of economic output, the resistance of the oil section, the resistance of the high water cut section, and the resistance of the water outlet section after plugging was used to calculate the plugging depth (re1, the limit water plugging radius), which offers a basis for the design of water plugging process parameters for horizontal wells. The field water plugging test results showed that after using this water plugging technology, the daily oil production increased from about 4 t/d to 20 t/d, the daily oil increase was 16 t/d, and the water cut decreased from 75% to about 25%. The water-blocking construction was a success.
Highlights
Casing and perforating completions, screen completions and open hole completions are the three main methods for horizontal well completion [1], and 70% of domestic and90% of foreign horizontal wells are completed by screen [2]
Development, most of the horizontal Wells have entered the medium and high water cut period, and water plugging has turn into the main method of enhancing oil recovery in the later period of horizontal well development in China
Water plugging technology in horizontal wells can be split into mechanical water shutoff and chemical selective water shutoff [3]: mechanical water shutoff includes preset working cylinders, packers, etc., and chemical water shutoff methods include the usual injection plugging agent, ACP seals the well section, etc
Summary
Screen completions and open hole completions are the three main methods for horizontal well completion [1], and 70% of domestic and. Chemical selective water plugging is to use the different chemical properties of plugging agent in oil and water environment to achieve the goal of water plugging without oil plugging or less oil plugging It applies to horizontal wells with unclear water-producing horizons or physical separation due to wellbore structure or technology [5]. The emulsion plugging agent was implemented for 42 well times, with an effective rate of 59.5% and a cumulative oil increase of 2.61 × 104 t. Kadyrov et al [8] proposed a new technology to control poor water production in the open-hole section of horizontal wells aimed at carbonate reservoirs. The comprehensive use of reservoir simulation to design the water plugging gel provides the best choice for plugging the water production area, thereby enhancing the recovery efficiency of steam-assisted heavy oil. The new water plugging system have been applied in field tests, which offers a basis for the design of water plugging process parameters for horizontal wells, and improves the pertinence and pertinence of water plugging design in horizontal wells
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