Determination method of optimal injection-production well spacing for vertical well multi-layer fracturing water injection development
A determination method, injection-production well technology, applied in the direction of production fluid, wellbore/well components, earthwork drilling and production, etc., can solve problems such as lack of optimal well spacing determination method
Active Publication Date: 2022-04-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
At present, the determination of optimal well spacing is only for single-layer fracturing, but the method for determining optimal well spacing for multi-layer fracturing water injection development of vertical wells is lacking.
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[0025] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below, together with the accompanying drawings, and are described in detail as follows.
[0026] For a vertical multi-layer fractured well group (see figure 1 ), n layers are mined together, and the permeability of each layer is k i , with a porosity of Φ i , crude oil viscosity is μ i , with thickness h i , the original oil saturation is s oi , the oil well undergoes multi-layer fracturing, and the fracture length of each layer is x fi , the injection-production pressure difference is △P, and the production decline rate after vertical well fracturing is D 0 . Based on this, the optimal distance between the oil well and the water well (referred to as the injection-production well spacing) is determined to achieve the highest cumulative oil production of the oil well.
[0027] Such as image 3 as shown, image 3...
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The present invention provides a method for determining the optimum injection-production well spacing for vertical well multi-layer fracturing water injection development. The method for determining the optimal injection-production well spacing for vertical well multi-layer fracturing water injection development comprises: Step 1, determining the start-up pressure gradient of each layer; 2. Determine the equivalent well diameter of each layer according to the fracture length of each layer; Step 3. Given an injection-production well spacing L, calculate the initial production of each layer; Step 4. Calculate the cumulative oil production of each layer after N years of production; Step 5. Calculate the total cumulative oil production of the well group after N years; Step 6. Determine the optimal injection-production well spacing. The injection-production well spacing obtained by the method for determining the optimal injection-production well spacing for multi-layer fracturing water injection development of vertical wells fully considers the seepage characteristics of fracturing vertical wells and the actual production of water injection development, and provides a reliable basis for oilfield development.
Description
technical field [0001] The invention relates to the field of multi-layer fracturing reconstruction of vertical wells in low-permeability oil reservoirs, in particular to a method for determining the optimum injection-production well spacing for water injection development of multi-layer fracturing of vertical wells. Background technique [0002] Vertical well multi-layer fracturing technology is an effective technical means to develop tight oil reservoirs. The determination of reasonable injection-production well spacing plays a key role in the sustainable and efficient development of low-permeability reservoirs. The matching of fracture parameters and well spacing in fracturing wells Relationships play an important role in improving productivity and developing reservoirs efficiently. At present, the determination of optimal well spacing is only for single-layer fracturing, but the optimal well spacing determination method for multi-layer fracturing and water injection devel...
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IPC IPC(8): E21B43/30E21B43/26E21B43/20
CPCE21B43/30E21B43/26E21B43/20
Inventor 李超任允鹏牛祥玉贾艳平李景梅刘晓英孙渡陈辉高伟魏杰王倩
Owner CHINA PETROLEUM & CHEM CORP