Balanced injection and recovery method of thickened oil thermal recovery horizontal well

Abstract

The invention relates to a balanced injection and recovery method of a thickened oil thermal recovery horizontal well. The method comprises steps as follows: before well completion of the horizontal well, a horizontal well section is designed section by section according to the permeability and oil saturation distribution of horizontal sections; the flow intensity of the horizontal sections is designed through comprehensive consideration of steam injection, production and wellbore flowing of the horizontal sections designed in the step 1; the sand blocking accuracy of a sand control screen pipe is designed according to distribution of the sand granularity of the stratum; a completion pipe string is designed and tripped in according to design results of steps 1 to 3; an injection and recovery integrated pipe string is designed and tripped in, steam injection is performed on the horizontal well section, and steam can be injected into corresponding well sections from flowing control devices of the section; the injection and recovery integrated pipe string is tripped out, a conventional production pipe string is tripped in for production, output liquids of all the segmentation sections can flow into a wellbore from respective flowing control devices. The balanced injection and recovery method of the thermal recovery horizontal well is provided, can realize uniform steam injection inside a pipe and outside the pipe in the horizontal well section at the steam injection stage of the thermal recovery horizontal well, can balance the output liquids in the horizontal well section at the production stage and can also perform the sand control function.

Description

technical field [0001] The invention relates to a method for balanced injection and production of horizontal wells in thermal recovery of heavy oil. Background technique [0002] In the process of steam injection in horizontal wells for thermal recovery of heavy oil, since the horizontal well section has a certain length, the conventional steam injection string has only one steam injection point, which makes the pressure distribution in the horizontal section of the string uneven. This causes uneven steam absorption in the horizontal section, resulting in local intrusion, steam channeling, and steam overflow, resulting in loss of production capacity. Analysis of thermal recovery horizontal well monitoring data in a heavy oil field in China shows that “steam channeling” is very serious during steam injection in horizontal wells, more than 70% of them have different degrees of steam channeling, and about 80% of wells have uneven production in the horizontal section, which seri...

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Problems solved by technology

There is no balanced liquid production control device in the horizontal well section of the two steam injection methods. Due to the difference in permeability of the horizontal section and the influence of the pressure drop of the wellbore flow, the uneven production of the horizontal well section will still be caused during production, which will affect the productivity of the horizontal well.

Both steam injection methods need to inject steam into the horizontal section, the construction process is complicated and the operation risk is high

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