Method for reshaping well pattern by adjusting target point position of water injection well through directional sidetracking
A water injection well and sidetracking technology, which is applied in directional drilling, wellbore/well components, production fluid, etc., can solve problems such as inability to adjust well pattern, low economic benefits, and low recovery
Inactive Publication Date: 2019-02-15
山东石大油田技术服务股份有限公司
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Problems solved by technology
So far, water flooding development is the most important development method. In order to improve the recovery rate, the current water injection is generally arranged according to the area or ranks. After long-term water injection, after the main flow of water injection is formed, the remaining oil between the wells is often not affected, resulting in recovery. low rate
If the flow field is changed, the past practice is to drill new wells or adjust wells, but under the current oil price, the economic benefits are low, and it is impossible to adjust the well pattern by drilling wells or adjusting wells (oil-water well exchange) as in the past
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[0007] The present invention will be described in detail below in conjunction with specific embodiments.
[0008] The present invention uses directional sidetracking to adjust the target position of a water injection well to reshape the well pattern. The method of directional sidetracking or radial perforation is adopted to adjust the underground water injection well to the non-main flow line, so that the water is flooded after water injection. Weak streamlines, thereby driving the remaining oil. At present, radial perforation can penetrate more than 100 meters into the formation, with controllable azimuth and direction, and form a new flow field in areas where there is ample remaining oil. Therefore, it is operability under existing conditions.
[0009] Such as figure 1 As shown, directional sidetracking or radial perforation is performed on the water well 2 around the remaining oil layer 1, as indicated by the black arrow pointing outwards. After water injection, the water drive...
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The invention discloses a method for reshaping a well pattern by adjusting the target point position of a water injection well through directional sidetracking. The underground water injection well isadjusted onto a non-mainstream line in a directional sidetracking or radial perforating mode, and thus after water injecting, a weak stream line is subjected to water drive, so that remaining oil isdriven. The method has the beneficial effects that the method is cheaper than new well digging, the price is lowered greatly, the target point can be controlled through well sidetracking, and the price is low.
Description
Technical field [0001] The invention belongs to the technical field of oilfield exploitation, and relates to a method for adjusting well patterns for oilfield water injection development. Background technique [0002] As a non-renewable resource, oil plays an important role in the country's economic development. With the deepening of exploration and development, the difficulty of mining will gradually increase. Therefore, improving oil recovery is an eternal theme in the process of oilfield development, which runs through the entire process of oilfield development. So far, waterflooding development is the most important development method. In order to improve the recovery rate, the current water injection is generally carried out according to the area or ranks. After the formation of the main water injection field after long-term water injection, the remaining oil between the wells is often not spread, resulting in recovery The rate is low. If the flow field is changed, the pas...
Claims
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Login to View More IPC IPC(8): E21B43/20E21B43/30E21B7/04E21B43/11
CPCE21B7/04E21B43/11E21B43/20E21B43/30
Inventor 叶卫保温鸿滨成燕良马中跃朱卫娜许彪吕景华谷加刚
Owner 山东石大油田技术服务股份有限公司