Method of Determining Well Spacing for Water Injection Development in Low Permeability Sandstone Reservoir
A low-permeability technology for sandstone reservoirs, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of limited indoor core sampling, low reliability of start-up pressure gradient, and unrepresentative reservoirs, etc. achieve the effect of avoiding paralysis
Active Publication Date: 2022-01-11
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
Similarly, due to the fact that the conditions of the actual reservoir in the ground are different from those of the laboratory test, and the indoor core sampling is limited, it cannot represent the real reservoir.
Therefore, it is not reliable to determine the threshold pressure gradient by fitting the laboratory core displacement test data.
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[0044] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.
[0045] Such as figure 1 as shown, figure 1 It is a flow chart of the method for determining the well spacing for water injection development in low-permeability sandstone reservoirs of the present invention.
[0046] Step 101, measuring and calculating the theoretical and technical limit well spacing, the economic limit well spacing and the economically reasonable well spacing for water injection development of low-permeability sandstone reservoirs;
[0047] Step 102, according to the dynamic analysis results of the low-permeability sandstone reservoir developed by water injection, determine whether the water injection effect can be seen in the production well;
[0048] Step 103, according to the analysis of the water injection effect in the producti...
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The invention provides a method for determining the well spacing for water injection development of low-permeability sandstone reservoirs, comprising: step 1, measuring and calculating the theoretical and technical limit well spacing, economic limit well spacing and economical reasonable well spacing for water injection development of low-permeability sandstone reservoirs; step 2 , determine whether the water injection effect can be seen in the oil production well; step 3, determine the relationship between the driving pressure gradient and the starting pressure gradient; step 4, quantitatively determine the speed of energy transfer in the reservoir formation; step 5, quantitatively determine the reservoir The strength of the seepage capacity of the formation; Step 6, determine the actual technical limit well spacing of the reservoir; Step 7, determine the well spacing for water injection development in low-permeability sandstone reservoirs. The method for determining the well spacing for water injection development in low-permeability sandstone reservoirs ensures that under the well spacing designed in the development plan, an effective displacement system can be established between the injection and production wells, the reserves controlled by the well pattern can be truly produced, and the oil The production capacity of the reservoir can be truly released, so as to avoid the low-permeability sandstone reservoir developed by water injection from being paralyzed after being put into production.
Description
technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for determining well spacing for water injection development in low-permeability sandstone reservoirs. Background technique [0002] During the development of medium and high permeability sandstone reservoirs, the influence of well spacing on the development effect is not very prominent. When designing well spacing in reservoir development plans, more attention is paid to production speed, stable production period, reserve control degree, ultimate recovery rate, economic benefits, etc., and less attention is paid to well spacing. Because in general, regardless of the designed well spacing in medium- and high-permeability sandstone reservoirs, the hydrodynamic forces between the injection and production wells are connected, and an effective displacement system can be established between the injection and production wells. The reserves can be produced, but th...
Claims
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IPC IPC(8): E21B43/30E21B43/20
CPCE21B43/30E21B43/20
Inventor 杨小平张强田同辉姜书荣刘旋翟亮徐耀东许彦群季雅新唐军
Owner CHINA PETROLEUM & CHEM CORP