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Double-spring balancing cylinder assembly

A technology for a spring assembly and a balance cylinder, which is applied in the field of a double-spring balance cylinder assembly, can solve the problems of increasing the processing difficulty, lengthening the length of the instrument, the length of the piston, etc., and achieves the effect of simplifying the difficulty of maintenance, balancing the internal and external pressure difference, and increasing reliability.

Inactive Publication Date: 2018-10-02
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the coring instrument uses the stretchability of the skin bag to balance the inside and outside. Due to the limited stretchability of the skin bag and the fact that the skin bag is easy to age, the skin bag often bursts, causing an enema and seriously damaging the instrument.
Optionally, if the conventional balance piston type is used for internal and external pressure balance, due to the relatively large oil tank, the required piston is relatively long, which increases the difficulty of processing, and at the same time lengthens the length of the instrument, increasing the risk of the instrument being stuck in downhole operations

Method used

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Effect test

Embodiment 1

[0037] combine figure 1 , figure 2 As shown, Embodiment 1 of the present invention provides a double-spring balance cylinder assembly, including a cylinder body 6, which is used for parallel installation on the side of the well wall coring cylinder, and at least two pistons are arranged inside the cylinder body 6 cavity; the piston cavity is provided with a sealing base 2, a sealing piston 5 and a spring assembly arranged between the sealing base 2 and the sealing piston 5, and the cavity on the side of the sealing piston 5 away from the spring assembly is a hydraulic oil cavity.

[0038] In the specific operation, the arrangement of multiple piston chambers can effectively shorten the overall length of the cylinder body 6 on the premise of ensuring the reliability of the instrument, can effectively reduce the overall volume of the balance cylinder, and can effectively expand the scope of adaptation of the balance cylinder assembly ;Through the parallel arrangement, the side...

Embodiment 2

[0053]Embodiment 2 of the present invention provides a double-spring balance cylinder assembly. The main structure is similar to Embodiment 1, and also includes a cylinder body. At least two piston cavities are arranged inside the cylinder body; The piston and the spring assembly arranged between the sealing base and the sealing piston, the cavity on the side of the sealing piston facing away from the spring assembly is a hydraulic oil cavity; for the specific setting of the main structure, please refer to the records in the first embodiment, where the purpose is to explain the difference between the two.

[0054] In this embodiment, the interior of the cylinder is provided with three piston chambers arranged in parallel, and each piston chamber is provided with a sealing base, a sealing piston, and a spring assembly arranged between the sealing base and the sealing piston to form independent The piston cylinder system, and together achieve pressure balance operation.

[0055...

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Abstract

The invention discloses a double-spring balancing cylinder assembly. The double-spring balancing cylinder assembly comprises a cylinder body, the cylinder body is used for parallelly being installed on the side face of a sidewall coring barrel, and the cylinder body is internally provided with at least two piston cavities. The piston cavities are internally provided with sealing bases, sealing pistons and spring assemblies, wherein the spring assemblies are arranged between the sealing bases and the sealing pistons, and cavities on the sides, deviating from the spring assemblies, of the sealing pistons are hydraulic oil cavities.

Description

technical field [0001] The present application relates to but not limited to the field of marine exploration, especially a double-spring balance cylinder assembly. Background technique [0002] At present, conventional wellbore coring instruments use a hydraulic pump to drive a hydraulic motor to drive a diamond drill bit to drill cores for coring operations, and the power required for the drill bit is relatively large during coring operations. Due to the relatively large flow rate of the hydraulic pump, the required hydraulic oil tank is also relatively large. For downhole instruments, larger oil tanks mean that the design of internal and external balance is more difficult, and the length of internal and external pressure balance cylinders is lengthened. [0003] In the prior art, the coring instrument uses the stretchability of the skin bag to balance the inside and outside. Due to the limited stretchability of the skin bag and the fact that the skin bag is easy to age, t...

Claims

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Application Information

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IPC IPC(8): E21B25/00
CPCE21B25/00
Inventor 冯永仁刘铁民田志宾陈永超
Owner CHINA NAT OFFSHORE OIL CORP
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