Carbon dioxide driven technical limit spacing optimization method
A carbon dioxide and optimization method technology, which is applied in earthwork drilling, wellbore/well components, production fluid, etc., can solve problems such as large deviations in calculation results, achieve the effects of improving accuracy, increasing economically recoverable reserves, and reducing development costs
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Embodiment 1
[0030] Embodiment 1, a method for optimizing the limit well spacing of carbon dioxide flooding technology under different production pressure differences, including the following five steps:
[0031] S1. Use the downhole sampler to extract crude oil samples from the L reservoir formation in the wellbore separator of the production well. Using the extracted formation crude oil samples, it is determined through laboratory experiments that the viscosity of the L reservoir formation crude oil is 0.78mPa·s. The specific extraction and determination process can be Obtained by a method for predicting the minimum miscible pressure of CO2 flooding in the patent publication number CN104462753A, which is a prior art and will not be described in detail here;
[0032] S2. Through the formation temperature and pressure test, it is determined that the formation temperature of the L reservoir is 151°C and the formation pressure is 60MPa. The viscosity of CO2 under the formation temperature and...
Embodiment 2
[0043] Embodiment 2. On the basis of Embodiment 1, the step S4 determines that the relationship between the start-up pressure gradient and the flow rate is specifically:
[0044] Through the core displacement experiment, the minimum start-up pressure gradient of CO2 flooding under different permeability cores under bound water, different pressures and different crude oil viscosities was measured, and the change curve of the start-up pressure gradient with the mobility was obtained. The fluidity change relation is:
[0045] G=1 / a·(K / μ) -b
[0046] In the formula: G is the starting pressure gradient, the unit is MPa / m; K is the air permeability, the unit is 10-3μm2; μ is the fluid viscosity, the unit is mPa s; a=3.226, b=0.5992.
Embodiment 3
[0047] Embodiment 3, on the basis of Embodiment 1, the specific steps for establishing the CO2 flooding technology limit well spacing calculation formula in the step S5 are:
[0048] S51. Using the reservoir engineering method, establish the bottom hole flow pressure of the production well as P wf Time CO 2 Calculation formula of limit oil supply radius of flooding technology;
[0049]
[0050] In the formula: r 泄油 is the oil drainage radius around the production well, in m; P f is formation pressure in MPa; P wf is the bottomhole flow pressure of the production well, in MPa; μ o is the viscosity of formation crude oil, in mPa s;
[0051] S52. Using the reservoir engineering method, establish a formula for calculating the limit displacement radius of the CO2 flooding technology when the bottom hole pressure of the injection well is Pe;
[0052]
[0053] In the formula, r displacement is the displacement radius around the gas injection well, in m; Pf is the formatio...
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