CN203642904U - Crack-fracture form depicting device - Google Patents

Abstract

The utility model relates to a crack-fracture form depicting device. The crack-fracture form depicting device includes a probe, a limiting valve, a connector, a flexible spring, a detector shell, a pressure sensor, a uniform pressure fixing plate, a display, a power supply and a wire; the probe is fixedly connected to the connector through the limiting valve; the flexible spring is connected with the probe through the connector; the pressure sensor is located at the top end of the flexible spring; the detector shell is fixedly connected with the uniform pressure fixing plate; and the power supply is fixedly connected with the uniform pressure fixing plate. With the crack-fracture form depicting device adopted, the defect of incapability of depicting the form of a crack-fracture existing in a traditional method can be overcome, and the form of the crack-fracture can be accurately depicted.

Description

Crack-fracture morphology is portrayed device

Technical field

The utility model relates to natural petroleum gas field field, and especially a kind of hydrocarbon reservoir crack-fracture morphology is portrayed device.

Background technology

In fractured reservoirs performance history, the aperture in crack, factor of porosity, permeability is evaluated most important, observe based on rock core, the observation of field analogous outcrop, can determine the occurrence in crack, density, but because complicacy and the Extending Law of crack geologic setting are irregular, only depend on simple measurement fracture length, occurrence and naked eyes are simply evaluated the degree of roughness of fracture, three-dimensional configuration that cannot accurate description crack, and the roughness of the form fracture fracture in crack, the diafiltration in crack of aperture and fluid has considerable influence, crack-fracture is described as a simple broken line or smooth curve by classic method, obviously the true Extending Law in this and crack is inconsistent, thereby can not be used for describing degree of roughness and the metamorphosis of crack fracture.

Utility model content

The utility model is intended to address the above problem, and provides a kind of crack-fracture morphology to portray device, and it has overcome the drawback that classic method cannot accurately be portrayed crack-fracture morphology, and its technical scheme adopting is as follows:

A kind of crack-fracture morphology is portrayed device, comprise probe, limit valve, adapter, coil tension spring, probe body, pressure transducer, even pressure fixed head, display, power supply, wire, described probe is fixed in adapter by limit valve, described coil tension spring is connected with probe by adapter, described pressure transducer is positioned at the top of coil tension spring, described probe body is fixed in even pressure fixed head, and described power supply is fixed in even pressure fixed head.

On technique scheme basis, described probe body is linearly equidistantly fixed in even pressure fixed head.

On technique scheme basis, described coil tension spring is positioned at probe body, and probe is connected with spring by adapter, and probe can move up and down.

The utlity model has following advantage: reasonable in design, easy to use, simple to operate, and based on the derived algorithm of data processing of this device, the form that can accurately portray crack-fracture, is applicable to field rock mass fracture, rock core crack fracture morphology is accurately described, easy to learn, easy to carry, the data that obtain of this measurement device are carried out repeatedly to the form that can accurately portray crack-fracture after iteration fractal interpolation, reach the requirement that oil-gas field development fracture shape is described.

Brief description of the drawings

Fig. 1 is perspective view of the present utility model;

Fig. 2 is that relative altitude and the point position that the utility model measures changes schematic diagram;

Fig. 3 is that the crack fracture morphology that the utility model is measured after iteration fractal interpolation of data changes schematic diagram;

Fig. 4 is that the crack fracture morphology that the utility model is measured after data second iteration fractal interpolation changes schematic diagram;

In Fig. 1: 1. probe, 2. limit valve, 3. adapter, 4. coil tension spring, 5. probe body, 6. pressure transducer, 7. even pressure fixed head, 8. display, 9. power supply, 10. wire, 11. rock mass to be measured, 12. rock mass slotted lines.

Embodiment

Below in conjunction with accompanying drawing 1, the utility model is described in further detail:

Shown in accompanying drawing 1, a kind of crack-fracture morphology is portrayed device, comprise probe 1, limit valve 2, adapter 3, coil tension spring 4, probe body 5, pressure transducer 6, even pressure fixed head 7, display 8, power supply 9, wire 10, described probe 1 is fixed in adapter 3 by limit valve 2, described limit valve 2 its effects are that the scope of activities of probe 1 is dwindled, probe 1 only can be moved at above-below direction, can not vacillate now to the left, now to the right, improve the precision of measuring, described coil tension spring 4 is connected with probe 1 by adapter 3, described adapter 4 its effects are by the elasticity energy in coil tension spring 4 that is converted into of the displacement that moves up and down of probe 1, described pressure transducer 6 is positioned at the top of coil tension spring 4, its effect is the pressure of Measurement accuracy coil tension spring 4 to it, described probe body 5 is fixed in even pressure fixed head 7, described power supply 9 is fixed in even pressure fixed head 7, described wire 10 its effects are by power supply 9 and display 8, pressure transducer 6 is communicated with.

Preferably, described probe body is linearly equidistantly fixed in even pressure fixed head, and its effect is to make the data that read more representative, is convenient to data later stage fractal interpolation.

Preferably, described coil tension spring is positioned at probe body, and probe is connected with spring by adapter, and probe can be moved up and down in probe body, and the moving displacement amount of probe above-below direction can effectively be delivered on coil tension spring simultaneously.

In use, first by fixing rock mass 11 to be measured, on the uneven surface in rock mass crack, draw a series of slotted lines 12, probe 1 is parallel with slotted line 12, even pressure fixed head 7 is pressed gently, made the registration of display screen 8 all non-vanishing, record the registration N of each display, if the stiffness factor of coil tension spring 4 is k, the relative altitude H of the probe 1 crack-fracture of surveying is:

H＝N/k （1）

Suppose that the utility model measures six groups of crack-fracture relative altitude data, as shown in table 1.

The position of table 1 measurement point and relative altitude change

Measurement is counted	Point position/cm	Elevation H/mm
			1	0	2.421
2	10	3.586
			3	20	5.962
4	30	8.716
			5	40	9.381
6	50	11.746

According to the data in table 1, can obtain the variation diagram (Fig. 2) of relative altitude and point position.The data that table 1 obtains are the actual fluctuating of crack-fracture, have from affinity between data, can utilize fractal interpolation principle to carry out crack-fracture morphology and portray, and for the feature of crack fracture, the data processing that this device adopts is as follows:

Fractal interpolation form R ²→ R ²form be:

$w\left[\begin{array}{c}x\\ y\end{array}\right]=\left[\begin{array}{cc}a& b\\ c& d\end{array}\right]\left[\begin{array}{c}x\\ y\end{array}\right]+\left[\begin{array}{c}e\\ f\end{array}\right]---\left(2\right)$

Wherein a, b, c, d, e, f are real number, and formula (2) is one linear transformation the most widely, by b=0, carries out fractal interpolation computing according to formula (2).

The point position measuring, the data set { (x of relative altitude composition _i, y _i) | i=0,1 ... N}, the transformation for mula of n fractal interpolation is:

$\left\{\begin{array}{c}{x}_{\mathrm{ni}}=a_n{x}_i+e_n\\ y_{\mathrm{ni}}=c_n{x}_i+d_n{y}_i+f_n\end{array}\right.i=\mathrm{0,1},...N;n=\mathrm{1,2},...N---\left(3\right)$

Can be obtained by formula (3):

$\left\{\begin{array}{c}{a}_n=(x_n-x_{n-1})/(x_N-x_0)\\ e_n=(x_N{x}_{n-1}-x_0{x}_n)/(x_N-x_0)\\ c_n=(y_n-y_{n-1}-d_n(y_N-y_0))/(x_N-x_0)\\ f_n=(x_N{y}_{n-1}-x_0{y}_n-d_n(x_N{y}_0-x_0{y}_N))/(x_N-x_0)\end{array}\right.---\left(4\right)$

D _ito ratio of compression, produce the feature in crack in length and breadth according to rock fracture, adopt Trendline fitting process to determine d _i, to data set { (x _i, y _i) | i=0,1 ... N} carries out the matching of polynomial trend line, wherein, matching number of times meets degree of fitting C>0.85, thinks the polynomial curve F(x of matching) can reflect that the overall trend of data set changes, after matching, residual values reflects in length and breadth to ratio of compression d _isize.Collection { (x fetches data _i, y _i) | i=0,1 ... in N} with polynomial fitting curve F(x) point of distance maximum (being parallel to y direction of principal axis), be designated as (x _r, y _r), corresponding ultimate range (being parallel to y direction of principal axis) is designated as u, as (x _r, y _r) be positioned at polynomial fitting curve F(x) and top (being y axle forward) time, u get on the occasion of; Otherwise u gets negative value.

x _s＝a _ix _r+e _i （5）

Obtain polynomial fitting curve F(x) upper corresponding point (x _s, y _s), cross interpolation section adjacent both ends point (x _i-1, y _i-1) and (x _i, y _i) make a straight line L, and obtain (x _s, y _s) with this straight line at the distance v being parallel on y direction of principal axis _i, as (x _s, y _s) be positioned at straight line L when top, v _iget on the occasion of; Otherwise v _iget negative value.

D is compared in longitudinal extension _ican be expressed as:

d _i＝v _i/u （6）

Can determine coefficient a, b, c, d, e, the f of fractal interpolating function according to formula (4)-(6), carry out different iterations interpolation arithmetics according to different accuracy requirement.Data set in table 1 is carried out obtaining table 2 after an iteration fractal interpolation, obtain the crack fracture morphology variation diagram (Fig. 3) after iteration fractal interpolation one time according to table 2 data.

Table 2 is the data preparation table after iteration fractal interpolation of crack fracture

Data set in table 1 is carried out obtaining crack fracture morphology variation (Fig. 4) after second iteration fractal interpolation.As seen from Figure 4, the form of crack-fracture can portray out preferably, according to the accuracy requirement of petroleum engineering exploitation, can carry out three times, four times iterated interpolation computings, until the fracture morphology in crack reaches accuracy requirement.

With way of example, the utility model is illustrated above, but the utility model is not limited to above-mentioned specific embodiment, all any changes of doing based on the utility model or modification all belong to the claimed scope of the utility model.

Claims (3)

1. a crack-fracture morphology is portrayed device, by probe (1), limit valve (2), adapter (3), coil tension spring (4), probe body (5), pressure transducer (6), even pressure fixed head (7), display (8), power supply (9), wire (10) composition, described probe (1) is fixed in adapter (3) by limit valve (2), described coil tension spring (4) is connected with probe (1) by adapter (3), described pressure transducer (6) is positioned at the top of coil tension spring (4), described probe body (5) is fixed in even pressure fixed head (7), described power supply (9) is fixed in even pressure fixed head (7).

2. a kind of crack-fracture morphology according to claim 1 is portrayed device, it is characterized in that: described probe body (5) is linearly equidistantly fixed in even pressure fixed head (7).

3. a kind of crack-fracture morphology according to claim 1 is portrayed device, it is characterized in that: described coil tension spring (4) is positioned at probe body (5), and probe (1) can move up and down in probe body (5).

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