| 摘要 |
The invention provides for injecting of high-pressure miscible natural gas directly into a newly opened or previously produced liquid hydrocarbon reservoir to saturate liquid hydrocarbons to improve their mobility to flow toward and into producing wells. Concurrent injection of gas, miscible or otherwise, into the hydrocarbon zone's gas cap supplies additional pressuring effects to aid the resaturation process. Downhole float operated injectors are improved to operate at high pressures maintained within the wellbore to assure liquid hydrocarbon flow completely out of the formation. The improved injector system then senses the difference between liquid and gas and closes its valve to retain the gas within the wellbore. Rejected gas is redirected into the reservoir's gas cap for its continued benefits. Two liquid-producing systems utilize: 1) a liquid column and backpressure valve or, 2) an extended-float-length injector to permit the injector's float to open at high differential pressures created by maintaining the wellbore at pressure above liquid saturation levels.
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