A method of carbon dioxide water control in horizontal wells to improve bottom water gas reservoir recovery
A carbon dioxide, horizontal well technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of reduced gas reservoir recovery rate and gas well productivity, etc., to improve gas reservoir recovery rate, slow down The rate of formation pressure drop and the effect of enhanced oil recovery
Active Publication Date: 2022-07-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0011] In order to solve the above technical problems, the present invention provides a water control method for horizontal wells that is simple in construction, economical, effective, safe and environmentally friendly, fundamentally overcomes the defects of the prior art, and effectively solves the problems caused by bottom water cones in the development process of horizontal wells in gas fields. Water flooding caused by gas flow, reduced productivity of gas wells, and reduced recovery of final gas reservoirs
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[0068] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, as long as there is no conflict, each embodiment of the present invention and each feature of each embodiment can be combined with each other, and the formed technical solutions all fall within the protection scope of the present invention.
[0069] The method for improving the recovery ratio of bottom water gas reservoirs by carbon dioxide water control in a horizontal well of the present invention comprises the following steps:
[0070] (1) On the basis of fine geological understanding and production performance analysis, CO injection from gas reservoirs 2 Guided by the screening conditions, carry out gas injection enhanced oil recovery selection in horizontal wells, and select areas suitable for the development of gas injection including CO injection. 2 Production well groups of horizontal wells and production...
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The invention proposes a method for improving the recovery rate of bottom water gas reservoirs by carbon dioxide water control in horizontal wells. 2 Screening Criteria for Enhanced Gas Reservoir as the Basis for Screening CO 2 Injection-production well group; determine CO 2 The total amount of injection and the injection rate, CO 2 It is injected into the gas-water interface of the water-flooded horizontal well, and the injection-production ratio is controlled at 1:1. 2 When the content exceeds 10%, shut down the well, calculate the gas production and water production of the production well, and evaluate the CO 2 Displacement effect and water control effect. The method for improving the recovery rate of bottom water gas reservoirs by controlling water in a horizontal well with carbon dioxide of the present invention can restrain the coning speed of bottom water, increase the water-free gas production period of gas wells, and finally improve the recovery rate of gas reservoirs.
Description
technical field [0001] The invention relates to a method for exploiting natural gas, in particular to a method for increasing the recovery rate of bottom water gas reservoirs by controlling carbon dioxide water in horizontal wells. Background technique [0002] Most of the gas reservoirs in my country belong to different degrees of water drive gas reservoirs, among which gas reservoirs with active edge and bottom water account for about 40-50%. Due to the low recovery degree of gas reservoirs when water breakthrough occurs, water control measures need to be taken in time. A large number of research and development examples show that gas-liquid two-phase flow will occur in gas reservoirs after edge-bottom water intrusion, resulting in reduced gas well productivity and gas wells. The water-free gas production period is shortened, the gas reservoir abandonment pressure is increased, and the ultimate recovery factor is greatly reduced. How to control water has been a difficult ...
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IPC IPC(8): E21B43/16E21B43/32
CPCE21B43/164E21B43/32Y02P90/70
Inventor 贾英严谨史云清郑荣臣
Owner CHINA PETROLEUM & CHEM CORP