CN101666228B - 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, and realizes 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avoiding the problem of the instrument withdrawing sticking caused by the condition that the backup arm can't be withdrawn without power when the instrument is failed.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 downhole instrument that oil exploration is used, 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 retracted among the body of instrument, touch and meet the card accident to prevent from carrying on instrument producing to hang with the borehole wall and internal surface of sleeve pipe in process.

Traditional safety device major part belongs to " spring automatic reset formula ", and purposes is limited, volume is also larger and pure spring mechanical resets.Also have and use common accumulator, the accumulator that uses at present is

" long tube type " helical spring accumulator.This accumulator will be accumulated enough hydraulic energies, must design very long helical spring, causes the accumulator entire length longer, if be concatenated on instrument, tool length will increase a lot, in lifting the instrument process, meets the card accident and more easily occurs.

Summary of the invention

The technical problem to be solved in the present invention is to provide 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, at least two accumulators also have been arranged in parallel between described backup arm and backup arm hydraulic circuit, all be provided with separately the hydraulic reposition element in described accumulator, also be provided with the accumulator control loop of controlling described accumulator and described backup arm and the conducting of backup arm hydraulic circuit or disconnection between described accumulator and described backup arm and backup arm hydraulic circuit.

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

Further, described hydraulic reposition element adopts spiral spring.

Further, described hydraulic reposition element adopts disk spring.

The present invention has following advantage:

1, the present invention adopts accumulator, and control being communicated with between accumulator and backup arm and backup arm hydraulic circuit by the accumulator control loop, 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 can't regain because of the unpowered operation of backup arm when running into fault, thereby cause instrument to regain the problem of meeting card.

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

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

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-shape spring structure schematic diagram 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, at least two accumulators 1 also have been arranged in parallel between backup arm 2 and backup arm hydraulic circuit 5, all be provided with separately hydraulic reposition element 3 in accumulator 1, also be provided with the accumulator control loop 10 of controlling accumulator 1 and backup arm 2 and 5 conductings of backup arm hydraulic circuit or disconnection between accumulator 1 and backup arm 2 and backup arm hydraulic circuit 5.

The present invention adopts accumulator 1, and control being communicated with between accumulators 1 and backup arm 2 and backup arm hydraulic circuit 5 by accumulator control loop 10, 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 can't regain because of the unpowered operation of backup arm 2 when running into fault, thereby cause instrument to regain the problem of meeting card.

The present invention adopts a plurality of accumulators 1 to be arranged in parallel, and is arranged on the instrument footpath upwards, when guaranteeing reset force, has effectively reduced tool length, has reduced instrument and has lifted the possibility of meeting card in 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 backup arm hydraulic circuit 5, the path between normally open valve 7 disconnection accumulators 1 and backup arm 2;

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

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

As shown in Figure 3, in the present invention, hydraulic 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 reposition element 3 of the present invention adopts disk spring 32, and reset force is larger.

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

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

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

Single accumulator 1 disk spring 32 decrement H processes when system pressure is 24.8MPa are 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 piston diameter; S is piston area; Q is the accumulator total oil reserve.

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

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 disk spring 32:

f＝34.06-14.81＝19.25

Accumulator 1 surplus pressure: $P=\frac{4E}{1-{\mathrm{\&mu;}}^2}\frac{t^4}{K_1{\&CenterDot;\mathrm{<figure-callout\; id="2"\; label="D"\; filenames="H2009100933258E00011.png,H2009100933258E00022.png"\; state="\{\{state\}\}">D</figure-callout>}}^2}{\&CenterDot;\mathrm{<figure-callout\; id="4"\; label="K"\; filenames="H2009100933258E00012.png,H2009100933258E00021.png"\; state="\{\{state\}\}">K</figure-callout>}}_4^2\&CenterDot;\frac{f}{t}\&CenterDot;[{\mathrm{<figure-callout\; id="4"\; label="K"\; filenames="H2009100933258E00012.png,H2009100933258E00021.png"\; state="\{\{state\}\}">K</figure-callout>}}_4^2\&CenterDot;(\frac{h_0}{t}-\frac{f}{t})(\frac{h_0}{t}-\frac{f}{2t})+1]$

In 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 pressing; E modulus of elasticity (MPa); μ is poisson's ratio; K ₁, K ₄Be coefficient.

$K_1=\frac{1}{\mathrm{\&pi;}}\&CenterDot;\frac{{\left(\frac{(C-1)}{C}\right)}^2}{\frac{C+1}{C-1}-\frac{2}{\ln C}}$ $K_4=\sqrt{-\frac{C_1}{2}+\sqrt{\left(\frac{C_1}{2}\right)+{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="H2009100933258E00011.png,H2009100933258E00022.png"\; state="\{\{state\}\}">C</figure-callout>}}_2}}$

$C_1=\frac{{\left(\frac{t^{\&prime;}}{t}\right)}^2}{(\frac{1}{4}\&CenterDot;\frac{H_0}{t}-\frac{t^{\&prime;}}{t}+\frac{3}{4})(\frac{5}{8}\&CenterDot;\frac{H_0}{t}-\frac{t^{\&prime;}}{t}+\frac{3}{8})}$

${\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="H2009100933258E00011.png,H2009100933258E00022.png"\; state="\{\{state\}\}">C</figure-callout>}}_2=\frac{C_1}{{\left(\frac{t^{\&prime;}}{t}\right)}^3}[\frac{5}{32}{(\frac{H_0}{t}-1)}^2+1]$

In 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 1.19MPa much larger than the known frictional resistance 0.5MPa of 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 respectively accumulation of energy to the single accumulator 1 in the present invention and open backup arm 2 after system pressure, 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 until motor current increases, and represents that accumulation of energy of the present invention finishes, 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 many cover backup arms 2, control respectively.

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

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

1, single accumulator 1 can produce larger hydraulic energy (being 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 in the present invention, placed side by side each accumulator 1, is communicated with conduit to get final product;

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

In sum; these are only preferred embodiment of the present invention, is not for restriction protection scope of the present invention, therefore; all any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.

Claims (3)

1. hydraulic accumulating device of telescoping ram, it is characterized in that: comprise backup arm (2) and backup arm hydraulic circuit (5), at least two accumulators (1) also have been arranged in parallel between described backup arm (2) and backup arm hydraulic circuit (5), all be provided with separately hydraulic reposition element (3) in described accumulator (1), also be provided with the accumulator control loop (10) of controlling described accumulator (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 backup arm hydraulic circuit (5), 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) is connected with the output of described backup arm hydraulic circuit (5), and the other end is connected with the input of described backup arm (2), one end of described normally open valve (7) is connected with the output of described accumulator (1), and the other end is connected with the input of described backup arm (2).

2. hydraulic accumulating device of telescoping ram as claimed in claim 1, is characterized in that: described hydraulic reposition element (3) employing spiral spring (31).

3. hydraulic accumulating device of telescoping ram as claimed in claim 1, is characterized in that: described hydraulic reposition element (3) employing disk spring (32).

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