CN101666228A - Hydraulic accumulating device of telescoping ram - Google Patents

Abstract

The invention provides a hydraulic accumulating device of a telescoping ram, comprising a backup arm and a backup arm hydraulic circuit, wherein at least two accumulators are installed in a parallel connection between the backup arm and the backup arm hydraulic circuit and are all independently provided with hydraulic reset components; and the accumulator control circuit which controls the conduction and the disconnection between the accumulators and the backup arm as well as the backup arm hydraulic circuit is installed between the accumulators and the backup arm as well as the backup arm hydraulic circuit. The invention adopts the accumulators, utilizes the accumulators to control the connection between the accumulators and the backup arm as well as the backup arm hydraulic circuit, andrealizes the function that the accumulators store energy when an instrument is energized and supply energy to the backup arm when the energy is off, thereby effectively avoiding the problem of the instrument withdrawing sticking caused by the condition that the backup arm can't be withdrawn without power when the instrument is failed.

Description

A kind of hydraulic accumulating device of telescoping ram

Technical field

The present invention relates to a kind of hydraulic accumulating device of telescoping ram.

Background technology

At present, in the employed downhole instrument of oil exploration, the overwhelming majority uses the instrument of the borehole wall, and in the process that this instrument is carried on instrument, generally all need to be withdrawn among the body of instrument, bump and meet the card accident with the borehole wall and internal surface of sleeve pipe generation extension to prevent to carry on the instrument in the process.

Traditional safety device major part belongs to " spring automatically reset formula ", and purposes is limited, volume is also bigger and pure spring mechanical resets.Also have and use common accumulator, the accumulator that uses is " long tube type " helical spring accumulator at present.This accumulator will be accumulated enough hydraulic pressure energy, must design very long helical spring, causes the accumulator entire length longer, if be concatenated on the instrument, tool length will increase a lot, in lifting the instrument process, meets the easier generation of card accident.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of telescoping ram resetting structure that can not increase tool length, reset reliable and stable.

In order to address the above problem, the invention provides a kind of hydraulic accumulating device of telescoping ram, comprise backup arm and backup arm hydraulic circuit, between described backup arm and backup arm hydraulic circuit, at least two accumulators also have been arranged in parallel, all be provided with the hydraulic pressure reposition element in the described accumulator separately, also be provided with the accumulator control loop of the described accumulator of control and described backup arm and conducting of backup arm hydraulic circuit or disconnection between described accumulator and described backup arm and the backup arm hydraulic circuit.

Further, described accumulator control loop comprises the normally close valve and the normally open valve of electromagnetic action; One end of described normally close valve links to each other with the output of described backup arm hydraulic circuit, and the other end links to each other with the input of described backup arm; The output of the described accumulator of one end of described normally open valve links to each other, and the other end links to each other with the input of described backup arm.

Further, described hydraulic pressure reposition element adopts spiral spring.

Further, described hydraulic pressure reposition element adopts disk spring.

The present invention has following advantage:

1, the present invention adopts accumulator, and by being communicated with between accumulator control loop control accumulator and backup arm and the backup arm hydraulic circuit, realized that accumulator gets accumulation of energy when electric at instrument, the function of energy is provided for backup arm during outage, can effectively avoid instrument when running into fault, can't regain, thereby cause instrument to regain the problem of meeting card because of the unpowered operation of backup arm.

2, the present invention adopts a plurality of accumulators to be arranged in parallel, and is arranged on instrument and directly makes progress, and when guaranteeing reset force, has effectively reduced tool length, has reduced instrument and has lifted the possibility of meeting card in the process.

3, hydraulic pressure reposition element of the present invention adopts disk spring, and reset force is bigger.

Description of drawings

Below in conjunction with accompanying drawing embodiments of the present invention are described further:

Fig. 1 shows a kind of hydraulic accumulating device of telescoping ram operating principle of the present invention schematic diagram;

Fig. 2 shows the structural representation of spiral spring in a kind of hydraulic accumulating device of telescoping ram of the present invention;

Fig. 3 shows disk spring structural representation in a kind of hydraulic accumulating device of telescoping ram of the present invention;

Fig. 4 shows a kind of hydraulic accumulating device of telescoping ram of the present invention installation site schematic diagram.

The specific embodiment

As shown in Figure 1, the present invention includes backup arm 2 and backup arm hydraulic circuit 5, between backup arm 2 and backup arm hydraulic circuit 5, at least two accumulators 1 also have been arranged in parallel, all be provided with hydraulic pressure reposition element 3 in the accumulator 1 separately, also be provided with the accumulator control loop 10 of control accumulator 1 and backup arm 2 and 5 conductings of backup arm hydraulic circuit or disconnection between accumulator 1 and backup arm 2 and the backup arm hydraulic circuit 5.

The present invention adopts accumulator 1, and by being communicated with between accumulator control loop 10 control accumulators 1 and backup arm 2 and the backup arm hydraulic circuit 5, realized that accumulator 1 gets accumulation of energy when electric at instrument, the function of energy is provided for backup arm 2 during outage, can effectively avoid instrument when running into fault, can't regain, thereby cause instrument to regain the problem of meeting card because of backup arm 2 unpowered operations.

The present invention adopts a plurality of accumulators 1 to be arranged in parallel, and is arranged on instrument and directly makes progress, and when guaranteeing reset force, has effectively reduced tool length, has reduced instrument and has lifted the possibility of meeting card in the process.

Accumulator control loop 10 comprises the normally close valve 6 and normally open valve 7 of electromagnetic action, and normally close valve 6 is two position two-way valve with normally open valve 7; Wherein:

Instrument gets when electric, and normally close valve 6 is communicated with the path between accumulators 1 and the backup arm hydraulic circuit 5, the path between normally open valve 7 disconnection accumulators 1 and the backup arm 2;

During the instrument outage, the path that normally close valve 6 disconnects between accumulator 1 and the backup arm hydraulic circuit 5, the path that normally open valve 7 is communicated with between accumulator 1 and the backup arm 2.

As shown in Figure 2, among the present invention, hydraulic pressure reposition element 3 adopts spiral spring 31.

As shown in Figure 3, among the present invention, hydraulic pressure reposition element 3 adopts disk spring 32.Disk spring 32 external diameters are 63 millimeters, and internal diameter is 31 millimeters, satisfy the piston size requirement of accumulator 1.Hydraulic pressure reposition element 3 of the present invention adopts disk spring 32, and reset force is bigger.

As shown in Figure 4, among the present invention, at least two accumulators 1, at least two accumulators 1 are arranged in parallel as a whole, all be provided with hydraulic pressure reposition element 3 at least two accumulators 1 separately, as a whole at least two accumulators 1 be set radially link to each other with instrument along instrument 2.

Among the present invention, at least two accumulators 1 adopt integrated casing 4 designs.A plurality of accumulator integrated casing designs among the present invention, profile is more attractive in appearance.

Be when the present invention is adopted disk spring 32 as hydraulic pressure reposition element 3 below, designing and calculating and verification experimental verification when system needs pressure to be 24.8MPa:

Single accumulator 1 disk spring 32 decrement H process when system pressure is 24.8MPa is calculated as can be known:

H＝18.2。

The oil reserve of setting single accumulator 1 is q

The oil reserve of single accumulator 1 is exactly accumulator 1 internal capacity, that is:

$q=\mathrm{\π}{\left(\frac{D}{2}\right)}^{2}H$

$=3.14\×{\left(\frac{66}{2}\right)}^2\×18.2$

$=63.23\mathrm{mL}$

Accumulator 1 progression $n=\frac{Q}{q}$

$=\frac{202.58}{63.23}$

$=3.25$

Wherein: D is a piston diameter; S is a piston area; Q is the accumulator total oil reserve.

Consider the factors such as trace leakage of hydraulic system,, adopt four accumulators 1 to carry out parallel connection accumulator 1 number rounding to 4.

Accumulation of energy expectation function of the present invention checking comprises two kinds of theoretical validation and experimental tests.

Below, at first carry out theoretical validation:

The maximum oil-filled amount Q (unit is ml) of the present invention:

Q＝4q

＝4×63.26

＝253.04

Four backup arms 2 are regained needed oil mass fully and are known as 202.58, and oil reserve of the present invention is 253.04, regain needed oil mass fully much larger than four backup arms 2, and hence one can see that meets design requirement.

Being calculated as follows of surplus pressure of the present invention when four backup arms 2 are regained fully:

Disk spring 32 burst sizes:

H ₁＝202.58/4S＝14.81

This moment, instrument disk spring 32 total elongations deducted the decrement that burst size is exactly a disk spring 32:

f＝34.06-14.81＝19.25

Accumulator 1 surplus pressure:

In the following formula: t is the thickness of butterfly spring 32; D is disk spring 32 external diameters; Single disk spring 32 deflections of f; h ₀The calculated value of deflection when being disk spring 32 pressings; E modulus of elasticity (MPa); μ is a poisson's ratio; K ₁, K ₄Be coefficient.

${\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="A2009100933250010H1.png,A2009100933250010H2.png"\; state="\{\{state\}\}">K</figure-callout>}}_1=\frac{1}{\mathrm{\&pi;}}\&CenterDot;\frac{{\left(\frac{(C-1)}{C}\right)}^2}{\frac{C+1}{C-1}-\frac{2}{\ln C}}$ $K_4=\sqrt{-\frac{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A2009100933250010H1.png,A2009100933250010H2.png"\; state="\{\{state\}\}">C</figure-callout>}}_1}{2}+\sqrt{\left(\frac{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A2009100933250010H1.png,A2009100933250010H2.png"\; state="\{\{state\}\}">C</figure-callout>}}_1}{2}\right)+{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="A2009100933250009H1.png,A2009100933250010H2.png"\; state="\{\{state\}\}">C</figure-callout>}}_2}}$

${\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A2009100933250010H1.png,A2009100933250010H2.png"\; state="\{\{state\}\}">C</figure-callout>}}_1=\frac{{\left(\frac{t^{\&prime;}}{t}\right)}^2}{(\frac{1}{4}\&CenterDot;\frac{H_0}{t}-\frac{t^{\&prime;}}{t}+\frac{3}{4})(\frac{5}{8}\&CenterDot;\frac{H_0}{t}-\frac{t^{\&prime;}}{t}+\frac{3}{8})}$

${\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="A2009100933250009H1.png,A2009100933250010H2.png"\; state="\{\{state\}\}">C</figure-callout>}}_2=\frac{C_1}{{\left(\frac{t^{\&prime;}}{t}\right)}^3}[\frac{5}{32}{(\frac{H_0}{t}-1)}^2+1]$

In the following formula: C=D/d, d are disk spring 32 internal diameters.

Obtain surplus pressure of the present invention through above formula clearing and also have the known frictional resistance 0.5MPa of 1.19MPa much larger than the contraction of single backup arm 2, hence one can see that satisfies design condition.

The present invention has also passed through repeatedly the lab simulation test, suppress accumulation of energy respectively to the single accumulator 1 among the present invention and behind system pressure, open backup arm 2, instrument carries out emergency power off, normally open solenoid valve 7, smooth opening, backup arm 2 can be in 2 minutes automatic drawing back, this moment, surplus pressure of the present invention still more than 1.19MPa, reached designing requirement fully.

Accumulator control loop 10 of the present invention powers on for before instrument sets operation at every turn normally close valve 6, and the present invention carries out oil-filled accumulation of energy automatically and increases up to motor current, represents accumulation of energy of the present invention to finish, and powers on to preserve energy of the present invention for this moment normally open valve 7.Power on for normally close valve 6 and set operation.The accumulator control loop 10 in the present invention, also can adopt many cover parallel-connection structures, and corresponding respectively many cover backup arms 2 are controlled.

When emergency appears in system (as the instrument sudden power), normally open valve 7 is opened automatically, and accumulator 1 is pressed into the hydraulic oil that stores the contraction oil pocket of backup arm 2 through normally open valve 7.Make instrument rely on energy of the present invention to withdraw automatically, avoid instrument to block, play the effect of safe unfreezing in the down-hole.

The present invention is a kind of brand-new design, also has following 3 advantages:

1, single accumulator 1 can produce bigger hydraulic pressure and can (be determined by amount of spring compression), and single accumulator 1 is highly lower, can be assemblied on the diametric(al) of instrument to use;

2, the in parallel use that be easy to superpose of the single accumulator 1 among the present invention is placed side by side each accumulator 1, is communicated with conduit to get final product;

3, the shell among the present invention 4 can design respectively, make by single accumulator 1, also can be according to the monolithic case 4 of good accumulator 1 being made of one of quantity of calculated in advance.

In sum; being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention, therefore; all any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (4)

1, a kind of hydraulic accumulating device of telescoping ram, it is characterized in that: comprise backup arm (2) and backup arm hydraulic circuit (5), between described backup arm (2) and backup arm hydraulic circuit (5), at least two accumulators (1) also have been arranged in parallel, all be provided with hydraulic pressure reposition element (3) in the described accumulator (1) separately, also be provided with the accumulator control loop (10) of described accumulator of control (1) and described backup arm (2) and (5) conducting of backup arm hydraulic circuit or disconnection between described accumulator (1) and described backup arm (2) and the backup arm hydraulic circuit (5).

2, hydraulic accumulating device of telescoping ram as claimed in claim 1 is characterized in that: described accumulator control loop (10) comprises the normally close valve (6) and normally open valve (7) of electromagnetic action; One end of described normally close valve (6) links to each other with the output of described backup arm hydraulic circuit (5), and the other end links to each other with the input of described backup arm (2); The output of the described accumulator of one end (1) of described normally open valve (7) links to each other, and the other end links to each other with the input of described backup arm (2).

3, hydraulic accumulating device of telescoping ram as claimed in claim 2 is characterized in that: described hydraulic pressure reposition element (3) adopts spiral spring (31).

4, hydraulic accumulating device of telescoping ram as claimed in claim 2 is characterized in that: described hydraulic pressure reposition element (3) adopts disk spring (32).

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