Underground tail end hydraulic switch

A technology of hydraulic switch and hydraulic sliding sleeve, which is applied in wellbore/well components, wellbore/well valve devices, earthwork drilling and production, etc. It can solve the problem of no downhole pipeline end device controlling hydraulic switch, no existing reference technology, Structure and application problems, to achieve the effect of eliminating the need for locking devices, compact and reasonable structure, and ensuring control accuracy

Pending Publication Date: 2018-12-25
MIANYANG GUMEI TECH
0 Cites 4 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0003] In the prior art, there is no control hydraulic switch for the end device of the d...
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Abstract

The invention discloses an underground tail end hydraulic switch, and aims to solve the problem that, under the prior technical conditions in the field of petroleum exploitation, constrained by the horizontal section of a horizontal well and a deep well section of a well with a large slope, a test device at the tail end of an underground pipeline cannot be controlled by using a switch, and the bottom condition of the petroleum well cannot be tested is solved. The device comprises a shell, a ball seat hydraulic sliding sleeve assembly, a connecting plate, a push rod, and an opening and closingmechanism, the opening and closing mechanism comprises a valve core, a valve core control spring and a sleeve. In view of the defects in the prior art, the prior underground hydraulic control technology is used to provide a brand-new (improved) underground hydraulic switch without changing the prior petroleum well operation specifications. According to the invention, the on-off control of the switch of the test device at the tail end of the underground petroleum is achieved without changing the electrical drive environment, and the normal operation of the petroleum well is not affected. The device has the advantages of ingenious conception and reasonable design, is a brand-new exploration to the underground hydraulic switch structure, and has remarkable progressive significance on the petroleum well detection.

Application Domain

ConstructionsWell/borehole valve arrangements +1

Technology Topic

Underground pipelinePetroleum +4

Image

  • Underground tail end hydraulic switch
  • Underground tail end hydraulic switch
  • Underground tail end hydraulic switch

Examples

  • Experimental program(1)

Example Embodiment

[0030] Example 1
[0031] The downhole end hydraulic switch of this embodiment includes a housing, a ball seat hydraulic sliding sleeve assembly, a connecting plate, a push rod, and an opening and closing mechanism. The opening and closing mechanism includes a valve core, a valve core control spring matched with the valve core, and a casing , The casing is set on the push rod. The ball seat hydraulic sliding sleeve assembly includes a hydraulic sliding sleeve, a ball arranged in the hydraulic sliding sleeve, and a ball return spring. The hydraulic sliding sleeve is provided with a counterbore and the ball return spring can press the ball on the bottom of the counterbore. The two sides of the connecting plate are respectively connected with the ball seat hydraulic sliding sleeve assembly and the push rod. The inner side of the shell is provided with a hole matching with the connecting plate; the hole is provided with a pressure control spring acting on the connecting plate.
[0032] In this embodiment, the ball seat hydraulic sliding sleeve assembly is arranged at one end of the housing, the ball seat hydraulic sliding sleeve assembly is connected to the push rod through a connecting plate, and the inner wall of the housing is provided with a ball seat hydraulic sliding sleeve assembly. The limit structure of the limit position. The casing is composed of an inner tube and an outer tube, a flow channel is arranged between the inner tube and the outer tube, and the opening and closing mechanism is arranged at both ends of the flow channel; the opening and closing mechanism in the flow channel is a sealed cavity. The push rod and the opening and closing mechanism constitute the switch body, and the front end of the switch body is provided with a pressure control spring, which can balance the thrust transmitted by the hydraulic sliding sleeve assembly of the ball seat. In this embodiment, steel balls can be selected for the sphere.
[0033] In this structure, the opening and closing mechanism can switch and control the flow channel; further, the ball seat hydraulic sliding sleeve assembly can move within a limited distance S relative to the shell, and the push rod can move the ball seat hydraulic sliding sleeve assembly to the distance S Passed to the sleeve, the push rod can trigger the sleeve to move the distance S so that the valve core moves to the inside of the housing and opens the flow path to form convection.
[0034] Further, the push rod of this embodiment includes one push rod and two push rods. The ball seat hydraulic sliding sleeve assembly is connected to the first casing through the connecting plate and the push rod section, and the ball seat hydraulic sliding sleeve assembly passes through the connecting plate. And the push rod section pushes the first sleeve to move, the first sleeve is connected to the second sleeve through the second section of the push rod and the first sleeve pushes the second sleeve and the first sleeve through the second section of the push rod The tube moves synchronously. In this structure, the two sections of the putter can be several, that is, the putter can be formed into N sections (N is a natural number, and ≥1).
[0035] The working process of the device is as follows: When the device is in normal operation (ie pumping oil into the well), such as figure 1 As shown, under the action of the sleeve and the pressure control spring, the valve core makes the flow path switch connecting the sealing cavity and the oil pipe in the "off" state; figure 2 As shown, when a control pressure P is applied on the well control , Under the action of pressure, the sphere prevents fluid from passing through the tubing and causes hydraulic pressure to act on the hydraulic sliding sleeve, causing the hydraulic sliding sleeve to forcibly move to the bottom of the well, thereby pushing the push rod and casing to the bottom of the well, and finally the valve core loses its sleeve. With the support of the tube, the spool moves into the tubing under the action of the spool control spring to open the sealing chamber flow path, and the spool automatically locks the reset movement of the casing, thus ensuring the continuous open state of the flow path, completing the switch "open" ”Control function. In the end image 3 As shown in the open state.

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Description & Claims & Application Information

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