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Casing deformation well oil bailing method

A technology for injecting wells and oil-water separation, which is applied in earthwork drilling, wellbore/well components, and production fluids, etc. It can solve problems such as insufficient liquid level and inability to carry out oil extraction operations, and achieve the effect of reducing liquid density and oil extraction Good, low-cost effect

Inactive Publication Date: 2018-11-20
PETROCHINA CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The invention provides a method for oil fishing in casing variable wells to solve the problem that the liquid level is not high enough to carry out oil fishing operations

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  • Casing deformation well oil bailing method

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Embodiment Construction

[0014] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0015] Such as figure 1 As described above, the present invention provides a method for pulling oil in casing-changing wells, comprising the following steps: step S10, preparing foaming agent and foaming; step S20, injecting foaming agent into the downhole oil-water mixture and standing for a set time ; Step S30 , after the oil-water mixture has risen to the standard height for oil extraction, lower an oil extraction tool into the well for oil extraction.

[0016] By injecting the foaming agent into the downhole oil-water mixture, since the foaming agent is mixed with air bubbles, bubble oil and / or bubble water can be formed in the downhole oil-water mixture, thereby reducing the liquid densit...

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Abstract

The invention provides a casing deformation well oil bailing method which comprises the following steps: S10, preparing a foaming agent and foaming; S20, injecting the foaming agent into a downhole oil-water mixture, and standing for set time; S30, tripping an oil bailing tool into the casing deformation well for bailing oil after the oil-water mixture rises to an oil bailing suction range. The method disclosed by the invention has the beneficial effects that the foaming agent is injected into the downhole oil-water mixture, and since the foaming agent is mixed with bubbles, bubble oil and / orbubble water can be formed in the downhole oil-water mixture. Therefore, the liquid density can be reduced, the oil layer does not leak under the condition that the liquid level height is increased, and the liquid level can reach the suction ability range of oil bailing equipment.

Description

technical field [0001] The invention relates to the field of oil extraction methods, in particular to an oil extraction method for casing variable wells. Background technique [0002] As the years of oilfield development increase, the production of some wells will gradually decrease, and these wells cannot create economic benefits by using conventional uninterrupted oil recovery methods such as pumping units. and other more economical ways to recover oil. Among them, oil extraction refers to a process in which the oil extraction pump is lowered into the casing of the oil well, sucked under the power of the oil extraction lifting equipment, and a negative pressure is generated to extract the oil-water mixture in the well to the ground. A necessary condition must be met in order to achieve oil well extraction: the oil-water level must be high enough to rise above the pump after the negative pressure is generated by the pump. However, in some oil wells, there is casing deform...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00
CPCE21B43/00E21B43/122
Inventor 庞全书王德伟贾财华王国军杨依峰段效威孙强孙立超王慧姜英鹏王铁钊汪宁
Owner PETROCHINA CO LTD