Processing method for reduction in formation pressure of carbonatite single well

Abstract

The invention provides a processing method for pressure decrease of a carbonatite single well. The carbonatite single well is a volatile reservoir single well. The reservoir type of the single well is a cave reservoir. The formation pressure of the single well is smaller than saturation pressure of oil reservoir and degassing occurs. The method comprises following steps: 1), measuring formation pressure of the single well in order to obtain difference between saturation pressure of oil reservoirs and formation pressure of the single well, wherein the difference is ground saturation pressure difference; 2), obtaining geological reserves of the single well; 3), obtaining secondary gas volume of the single well according to geological reserves of the single well; 4), obtaining required water filling quantity for restoring formation pressure of the single well above saturation pressure of oil reservoirs according to specific pressure drop of oil production and secondary gas volume prior to degassing; 5), filling water to the single well. The technical scheme can obtain required water filling quantity for restoring formation pressure of the single well above saturation pressure of oil reservoirs and helps avoid the drowning single well during a water filling process.

Description

technical field [0001] The invention relates to a treatment method for reducing the formation pressure of a single carbonate rock well, in particular to a method for treating a single well when the formation pressure of a single carbonate well is lower than the saturation pressure of its oil reservoir. Background technique [0002] Under normal circumstances, most of the oil field development release wells use well pattern water injection and gas injection to maintain the reservoir pressure, so as to avoid the undesired formation degassing or reverse condensation when the well pressure is lower than the reservoir saturation pressure during the reservoir development process. However, the above-mentioned method of maintaining reservoir pressure usually needs to be carried out under the condition that there is a well connected. [0003] For single wells with relatively isolated reservoirs, especially single wells in carbonate volatile oil reservoirs, due to relatively isolated ...

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Problems solved by technology

Even if a single well that is suitable for large-scale water injection is judged based on the above experience, there are still problems such as difficult to accurately determine the water injection volume and prone to water flooding during the water injection process. At present, there is no mature method for reducing the formation pressure of a single well in a carbonate volatile oil reservoir. The technology to supplement the formation energy method can only allow the production to decrease

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