A ball-assisted well flushing string
A technology for flushing well pipes and throwing balls, which is applied in the directions of flushing wellbore, wellbore/well components, and production fluid, etc., can solve the problem of no solution, and achieve the effect of prolonging the pump inspection period and realizing the normal circulation.
Active Publication Date: 2020-05-08
PETROCHINA CO LTD
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[0005] There is currently no effective workaround for this
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[0029] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the accompanying drawings in the embodiments of the application. Apparently, the described embodiments are only part of the embodiments of the application, not all of them. Based on the implementation manners in this application, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the scope of protection of this application.
[0030] It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purpos...
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The invention provides a ball-injecting auxiliary well-washing pipe string comprising a casing pipe, a screen pipe, a packer, a packing cup and an oil production pipe string. Perforation shot holes are formed in the casing pipe, a first annular space is formed by the screen pipe and the casing pipe, plugging adjusting balls are accommodated in the first annular space, screen holes of the screen pipe do not allow the plugging adjusting balls to pass through and allow liquid to pass through; the packer is connected to the upper end of the screen pipe, the packing cup is connected to the lower end of the screen pipe, and the plugging adjusting balls are limited in the position, between the packer and the packing cup, of the first annular space; an oil pumping pump is arranged in the oil production pipe string, the oil production pipe string is arranged above the packer, and a second annular space is formed by the oil production pipe string and the casing pipe; and the oil production pipestring is internally provided with a check valve which communicates from bottom to top. According to the ball-injecting auxiliary well-washing pipe string, it can be ensured that a well-washing liquiddoes not flow into a stratum to pollute the stratum by utilizing the plugging adjusting balls to control the well-washing liquid in the process of well washing; in addition, the oil pumping pump in the oil production pipe string and the perforation shot holes in the casing pipe can further be cleaned simultaneously, normal circulating of the well-washing liquid is realized, and the pump inspection cycle is prolonged.
Description
technical field [0001] The application belongs to the technical field of petroleum exploitation, and in particular relates to a throwing-assisted well flushing pipe string. Background technique [0002] In the process of mining some saline formations, affected by many formation factors such as sand production, scaling, and wax formation, the oil well pump needs to be cleaned regularly to extend the pump inspection period. However, due to the particularity of the saline formation, if the flushing fluid is injected into the formation during the well flushing process, the saline formation will be dissolved in the flushing fluid, which may cause the formation to collapse. [0003] For this, Chinese utility model CN205297364U proposes a kind of anti-pollution well washing process string through the oil layer, and the well washing fluid will not enter the formation during the well washing process. Specifically, during the well cleaning operation of the process string, the well cl...
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IPC IPC(8): E21B21/00E21B43/08E21B21/10E21B43/14
CPCE21B21/00E21B21/10E21B43/086E21B43/14
Inventor 安岩张洪君黄志佳李楠何得海安泽典魏冉冉爱华史策戴双宁张越刘双亮
Owner PETROCHINA CO LTD