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Tight oil steam flooding steam temperature design method

A technology of steam temperature and design method, which is applied in earth-moving drilling, production fluid, wellbore/well components, etc., can solve the problem of ineffective supplementary formation energy and enhanced oil recovery method, low recovery rate, large production decline, etc. problems, to achieve the effect of improving the development effect

Inactive Publication Date: 2020-04-17
PETROCHINA CO LTD
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Problems solved by technology

[0005] Aiming at the problem that the current quasi-natural energy development of "horizontal well + volume fracturing" in the development of tight oil reservoirs leads to large production decline and low recovery rate in the later stage, and there is no effective method to supplement formation energy and enhance recovery rate, it is proposed to use steam The high-temperature field formed by flooding heats crude oil, and relies on the thermal expansion of crude oil to increase the formation energy

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  • Tight oil steam flooding steam temperature design method
  • Tight oil steam flooding steam temperature design method
  • Tight oil steam flooding steam temperature design method

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Embodiment Construction

[0029] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified, rather than indicating or implying that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative impor...

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Abstract

The invention discloses a tight oil steam flooding steam temperature design method, and aims at defining the optimal steam temperature range in a tight oil reservoir and calculating the change degreeof formation pressure when the temperature of the oil reservoir is heated to different degrees by taking a crude oil thermal expansion coefficient and a compression coefficient tested by a high-temperature and high-pressure phase analyzer as the basis. Meanwhile, a calculation method of the optimal steam temperature is provided under the condition of considering the starting pressure gradient andthe rupture pressure. According to the method, the limitation that steam flooding is only suitable for thick oil development in the past is broken through, a theoretical basis is provided for tight oil supplementing stratum energy parameter optimization and a new method is provided for improving the tight oil development effect.

Description

Technical field [0001] The invention belongs to the technical field of tight oil enhanced recovery efficiency in oil and gas field development, and specifically relates to a method for designing tight oil steam flooding steam temperature. Background technique [0002] Tight oil refers to the oil stored in tight sandstone, tight carbonate rock and other reservoirs with an effective permeability of less than or equal to 0.3mD. Broadly speaking, tight oil refers to oil produced in low-porosity and low-permeability shale or other tight rock reservoirs. Tight oil is an important type of unconventional reservoir. Due to the low permeability of the reservoir, it is difficult to establish an effective displacement pressure system for water injection under the economic limit well pattern. At present, the method of "horizontal well + volume fracturing" is usually adopted. Quasi-natural energy development. The formation energy cannot be effectively supplemented, resulting in a large decli...

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Application Information

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IPC IPC(8): E21B43/24E21B49/00
CPCE21B43/24E21B49/00
Inventor 郑自刚张庆洲李兆国张永强熊维亮李花花段文标王靖华李姝蔓袁颖婕
Owner PETROCHINA CO LTD
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