Method for increasing bottom-water gas reservoir recovery rate through carbon dioxide water control in horizontal well
A carbon dioxide and horizontal well technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of gas reservoir recovery reduction and gas well productivity reduction, so as to improve gas reservoir recovery and increase The effect of improving oil recovery and improving the water-free gas recovery period of gas wells
Active Publication Date: 2020-08-25
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 in conjunction with the accompanying drawings and specific embodiments. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
[0069] The method for increasing the recovery of bottom water gas reservoirs by controlling water in horizontal wells with carbon dioxide according to the present invention comprises the following steps:
[0070] (1) On the basis of fine geological understanding and production performance analysis, inject CO into gas reservoirs 2 Guided by the screening conditions, the horizontal well gas injection enhanced oil recovery area was selected, and the area suitable for CO2 injection was selected. 2 Production well groups of horizontal wells and production wells;
[0071] Contai...
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The invention provides a method for increasing the bottom-water gas reservoir recovery rate through carbon dioxide water control in a horizontal well. A CO2 injection-production well group is selectedbased on a screening criteria for increasing the gas reservoir recovery rate through CO2; and the total injection amount and injection rate of CO2 are determined, CO2 is injected into a gas-water interface of the water-flooded horizontal well through a pipe column, the injection-production ratio is controlled to be 1:1, when the content of CO2 in a production well exceeds 10%, the well is shut down, the gas yield and water yield of the production well are calculated, and the CO2 displacement effect and the water control effect are evaluated. According to the method for increasing the bottom-water gas reservoir recovery rate through carbon dioxide water control in the horizontal well, the coning speed of the bottom water can be inhibited, the water-free gas production period of a gas wellis improved, and the gas reservoir recovery rate is finally increased.
Description
technical field [0001] The invention relates to a method for exploiting natural gas, in particular to a method for controlling carbon dioxide water in a horizontal well and increasing the recovery rate of bottom water gas reservoirs. Background technique [0002] Most of the gas reservoirs in my country belong to different degrees of water drive gas reservoirs, among which the gas reservoirs with active edge and bottom water account for about 40-50%. Since the recovery degree of gas reservoirs is low when water breaks through, timely water control measures need to be taken. 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 productivity of gas wells and The water-free gas production period is shortened, the abandonment pressure of the gas reservoir is increased, and the ultimate recovery rate is greatly reduced. How to control water has always been a dif...
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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