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Step-by-step deep profile control method based on pressure field and flow velocity field distribution

A technology of deep profile control and flow velocity field, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc. It can solve the problems of large differences and insufficient consideration of the influence and combination of flow velocity on the performance of profile control agents.

Active Publication Date: 2014-03-19
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

The distribution of pressure field and velocity field in the formation varies greatly with different spatial positions. Although the current deep profile control technology adopts a multi-stage composite method in the design of slugs, it is not consistent with the current distribution of pressure field and velocity field. In combination, at the present stage, in the evaluation of profile control agent performance experiments, the influence of flow rate on profile control agent performance has not been fully considered

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  • Step-by-step deep profile control method based on pressure field and flow velocity field distribution
  • Step-by-step deep profile control method based on pressure field and flow velocity field distribution
  • Step-by-step deep profile control method based on pressure field and flow velocity field distribution

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Embodiment Construction

[0019] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0020] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0021] Assumption conditions: homogeneous horizontal infinite formation, permeability K, fluid viscosity μ.

[0022] One production well A, one water injection well B, the well spacing is 2a, and the wellbore radius is R w , the injection well pressure is P 注 . The injection volume per unit thickness of the water injection well is q, and the production volume per unit thickness of the production well is q. At any point M in the formation, the distance to the production well A is r 1 , the distance to the injection well is r 2 , through physical simulation experiments, the optimal injection depth obtained is r 0 , the schematic diagram is as figure 1 .

[0023] Generally, the range of profile control refers to the distanc...

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Abstract

The invention discloses a step-by-step deep profile control method based on pressure field and flow velocity field distribution. The step-by-step deep profile control method includes the following steps: screening profile control agents according to actual stratum conditions of an oil field, conducting step-by-step profile control step dividing according to an actual stratum falloff curve, dividing a stratum into a near-well zone, a far-well zone and a stratum deep part, measuring the relationship between the profile control agent injection amount and the recovery efficiency through a physical modeling test, obtaining the optimum injection depth r0 of the profile control agents by calculating the input-output ratio, setting test conditions to measure the breakthrough pressure gradient of the profile control agents according to the flow velocity field distribution, drawing an equivalent plate of the breakthrough pressure gradient, screening a profile control agent formula of each section plug on the equivalent plate of the breakthrough pressure gradient when the breakthrough pressure gradient of the profile control agents is equal to the stratum pressure gradient according to the equal-pressure-drop gradient principle, combining the profile control section plugs, conducting cost calculation on each section plug combination, and obtaining the section plug combinations, namely the optimal section plug combination, with the lowest cost in an optimized mode.

Description

technical field [0001] The invention relates to a step-by-step deep profile control method based on the distribution of pressure field and flow velocity field, belonging to the field of oil and gas field development. Background technique [0002] Water injection development is the most commonly used development method for oil reservoirs at present. When the self-spraying energy of the oil layer is continuously consumed, water injection is required to supplement the energy and maintain normal production. After long-term water injection development, the heterogeneity of the reservoir is more serious, and the injected water advances unevenly along the high-permeability strip, resulting in a large area of ​​injected water in the high-permeability layer. The oil-rich area cannot be injected effectively, the effect of water driving is poor, and the production of reserves is very uneven, which seriously affects the development effect of water flooding and polymer flooding. For oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B47/00E21B49/00
Inventor 赵娟张健吕心瑞吕鑫
Owner CHINA NAT OFFSHORE OIL CORP
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