Prediction method and system for thermal recovery pressure distribution of vertical wells in low-permeability heavy oil reservoirs
A pressure distribution, oil and oil technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve problems such as the inability to accurately describe the seepage characteristics of low-permeability heavy oil reservoirs
Active Publication Date: 2019-08-30
CHINA PETROLEUM & CHEM CORP +1
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Therefore, the introduction of conventional start-up pressure gradients cannot accurately describe the seepage characteristics of low-permeability heavy oil reservoirs after thermal recovery
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[0051] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
[0052] In the process of thermal recovery of low-permeability heavy oil reservoirs, the change of temperature affects the viscosity of crude oil, and then affects the start-up pressure gradient. Affected by the heating radius, the starting pressure gradient increases gradually along the wellbore. Therefore, the present invention proposes the concept of variable starting pressure gradient for the first time, ...
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The invention discloses a low-permeability heavy oil reservoir vertical shaft thermal recovery pressure distribution prediction method and system. The method comprises the following steps of building a variable-starting-pressure gradient model, building a low-permeability heavy oil reservoir variable-starting-pressure gradient model according to the temperature distribution in different positions at the shaft bottom of a vertical shaft, building a seepage flow model, zoning a vertical shaft thermal recovery seepage flow field according to the variable-starting-pressure gradient distribution features so as to build a seepage flow equation corresponding to each zone, building a pressure distribution prediction model, and solving the seepage flow equation of each zone according to the variable-starting-pressure gradient model so as to obtain the pressure distribution prediction model of each zone. The theoretical basis is provided for optimizing the reasonable development mode and the well-net and distance.
Description
technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a method and system for predicting the distribution of thermal recovery pressure in vertical wells of low-permeability heavy oil reservoirs. Background technique [0002] With the continuous development of oil extraction and the further development of oil recovery technology, low-grade oil reservoirs such as low-permeability and extra-low-permeability heavy oil reservoirs have become the focus of development. According to laboratory experiments, when fluid seeps in low-permeability and heavy oil reservoirs, an additional pressure gradient must overcome the resistance caused by the adsorption film or hydration film on the rock surface to flow. This additional pressure gradient is called threshold pressure gradient, which is common in the above two types of reservoirs. Due to the existence of threshold pressure gradient, the conventional linear se...
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IPC IPC(8): E21B43/24
Inventor 曹立迎徐婷秦学杰曹丽丽宋传真宋文芳杨森
Owner CHINA PETROLEUM & CHEM CORP