CN102606133B - Production method for calibration block of radioactive fluid density logging instrument - Google Patents

Abstract

The invention discloses a production method for a calibration block of a radioactive fluid density logging instrument. The method includes: making density calibrated scales equal in length and width but unequal in height according to the dimension of the sampling channel of the radioactive fluid density logging instrument, calculating scale coefficients of the fluid density logging instrument in air and pure water respectively and storing; placing the radioactive fluid density logging instrument in air, placing the density calibrated scales equal in length and width but unequal in height into sampling chambers respectively, using a logging ground system to read the scale coefficients and record displayed values of fluid density, and setting up data tables of the density calibrated scales unequal in height and the corresponding density values; determining the height values of the density calibrated scales unequal in height according to the data tables when the density value error is zero; and making a density calibration block according to the height values of the density calibrated scales. Using the method can produce corresponding standard calibration blocks for various radioactive fluid density logging instrument, the problem that errors of the calibration block are out of standard is effectively solved, and scale precision of the instrument is improved.

Description

Radioactive fluid densilog instrument calibration block preparation method

Technical field

The present invention discloses a kind of radioactive fluid densilog instrument calibration block preparation method, belongs to oilfield field downhole well fluid density measure instrumentation technical field.

Background technology

At present, when oil gas field carries out production logging, radioactive fluid densilog instrument is for measuring the density of downhole well fluid, to determine the content of each phase of borehole fluid and the regularity of distribution along pit shaft thereof, thus determine that moisture content, dividing flow body interface are to draw production profile, before radioactive fluid densilog instrument is logged well, need to carry out scale with calibration block.

Existing radioactive fluid densilog instrument by gamma ray source, sampling channel and probe three part form, when Media density in sampling channel changes, the counting of probe is just along with changing, the counting of well logging ground-based system record probe, adopts calibration data to calculate the fluid density value just can measured in real time in pit shaft.Before well logging, the calibration block of standard need be put in the sampling channel of densilog instrument, densilog instrument is demarcated.The calibration block of standard ensures the instrument measurements most important condition accurately, and reach this requirement, the density instrument for different size or same specification different batches should adopt corresponding density graduation block respectively.The instrumental constant such as sampler chamber length, instrument wall thickness of the densilog instrument produced due to different manufacturer or same producer different batches there are differences, and uses the density graduation block of same specification inevitably to produce error and exceeds standard.

Summary of the invention

The object of the invention is to overcome the large defect of existing FDT calibration block error, a kind of preparation method of radioactive fluid densilog instrument calibration block is provided, and produce the standard calibration block of all kinds of radioactive fluid densilog instrument according to the method.

For achieving the above object, the technical solution used in the present invention is as follows:

One, according to length and the width of the size determination rule of the sampling channel of radioactive fluid densilog instrument, the density graduation chi that each length is all identical, width is all identical, highly not identical is made;

Two, powered to FDT by well logging ground-based system, after FDT is working properly, radioactive fluid densilog instrument is placed in air, 0.00g/cm is carried out to it ³scale; Radioactive fluid densilog instrument sampler chamber is placed in pure water, 1.00g/cm is carried out to it ³scale; Use Logging Software to carry out calibration factor calculating, and preserve;

Three, radioactive fluid densilog instrument is placed in air, the density graduation chi that each length is all identical, width is all identical, highly not identical is put into respectively in sampler chamber, the calibration factor preserved by well logging ground-based system read step two, and recorded stream bulk density show value, set up the tables of data of the density graduation chi of the differing heights density value corresponding with it.

Four, according to step 3 the data obtained table, the height value of the density graduation chi of differing heights when density value error is zero is determined.

Five, according to the height value of the density graduation chi of step 4 gained, density graduation block is made.

The corresponding standard calibration block that the present invention can produce for all kinds of radioactive fluid densilog instrument, efficiently solves the problem that calibration block error exceeds standard, and improves the scale precision of instrument.

Accompanying drawing explanation

Fig. 1 is radioactive fluid density instrument sampler chamber schematic diagram of the present invention;

Fig. 2 is rule of the present invention length and wide schematic diagram;

Fig. 3 is altitude scale chi schematic diagram of the present invention.

Detailed description of the invention

Below in conjunction with accompanying drawing 1, Fig. 2, Fig. 3, the present invention will be further described:

Embodiment one: the present invention realizes according to the following steps:

One, according to length and the width of the size determination rule of the sampling channel of radioactive fluid densilog instrument 1, making density graduation chi 3 length is 42.60mm, width is 12.40mm, the material being highly respectively 0.5mm, 1.0mm, 5.0mm, 10.0mm, 20.0mm is density graduation chi 3a, 3b, 3c, 3d, 3e of aluminium matter, sees Fig. 2 and Fig. 3;

Two, powered to FDT by well logging ground-based system, after it is working properly, radioactive fluid densilog instrument is placed in air, 0.00g/cm is carried out to it ³scale; Radioactive fluid densilog instrument sampler chamber is placed in pure water, 1.00g/cm is carried out to it ³scale; Use fluid density Calibration Software to carry out the calculating of calibration factor A and B, and preserve;

Three, radioactive fluid densilog instrument 1 is placed in air, the density graduation chi 3 of differing heights is put into successively in sampler chamber 2, calibration factor A and B preserved by well logging ground-based system read step two, observe the fluid density show value of well logging ground-based system, packing density value is 0.10g/cm respectively ³, 0.40g/cm ³, 0.70g/cm ³, 1.00g/cm ³, 1.20g/cm ³time density graduation chi 3 overall height H 1; Require that density error value D1 measured by well logging ground-based system is at ± 0.01g/cm ³within, in record sampler chamber 2 in rule 3 overall height H 1 and error amount D1 to table 2; By putting in sampler chamber 2 or reducing 3a0.5mm or 3b1.0mm rule, well logging ground-based system display density error value D2 is at ± 0.01g/cm ³within, in record sampler chamber 2 in rule 3 overall height H 2 and error amount D2 to table 1.

Table 1 density graduation chi height sampling data table

Four, measured data are substituted into interpolation calculation formula, calibration block can be obtained at 0.10g/cm ³, 0.4g/cm ³, 0.7g/cm ³, 1.00g/cm ³, 1.20g/cm ³the calibrated altitude H of position, its design formulas is:

$H=H1-\frac{H1-H2}{D1-D2}\×D1$

In formula, H------error is 0.00g/cm ³time, the height of density graduation block;

H1------first sampled point, the height of density graduation chi;

D1------first sampled point, the measure error of density instrument;

H2------second sampled point, the height of density graduation chi;

D2-------second sampled point, the measure error of density instrument;

According to the above-mentioned manufactured size tables of data calculating density instrument calibration block, see list 2

The manufactured size tables of data of table 2 radioactive fluid densilog instrument 1 calibration block

Scale value	0.10g/cm 3	0.40g/cm 3	0.70g/cm 3	1.00g/cm 3	1.20?g/cm 3
						Instrument is numbered	Highly (mm)	Highly (mm)	Highly (mm)	Highly (mm)	Highly (mm)
1	4.25	16.18	28.71	41.33	48.40

The density graduation chi height of the different scale values five, obtained according to table 3, makes fluid density calibration block.

Fluid density calibration block made by embodiment one is checked by the following method:

1, well logging ground-based system is powered to FDT 1, treats that it is working properly.

2, radioactive fluid densilog instrument 1 is placed in air, and ensures that its sampler chamber 2 is placed in air completely, carry out 0.00g/cm ³scale.

3, in radioactive fluid densilog instrument 1 sampler chamber 2, density graduation block 1.00g/cm is put into ³position, well logging ground-based system carries out 1.00g/cm ³scale.

4, use well logging ground-based system to carry out calibration factor calculating, and preserve.

5, in radioactive fluid densilog instrument 1 sampler chamber 2, density graduation block 1.20g/cm is put into ³position, well logging ground-based system is measured, and record gained density value, its error is 0.011g/cm ³within.

6, repeat step 5, in radioactive fluid densilog instrument 1 sampler chamber 2, put into calibration block 0.70g/cm respectively ³, 0.40g/cm ³, 0.10g/cm ³position, record gained density value, its maximum deviation is at ± 0.02g/cm ³within.

7, if all position deviations are all at ± 0.02g/cm ³within, test ending.

By inspection, adopt the radioactive fluid density graduation block convection cell density instrument made according to the present invention to carry out scale, scale inspection worst error, in allowed band, reaches standard-required.

According to the step of embodiment one, according to length and the width of the size determination rule of the sampling channel of radioactive fluid densilog instrument, the density graduation block of the radioactive fluid densilog instrument of different size can be made.

Claims (1)

1. a radioactive fluid densilog instrument calibration block preparation method, is characterized in that: comprise the following steps:

One, according to length and the width of the size determination rule of the sampling channel of radioactive fluid densilog instrument, the density graduation chi that each length is all identical, width is all identical, highly not identical is made;

Two, powered to FDT by well logging ground-based system, until after FDT is working properly, radioactive fluid densilog instrument is placed in air, 0.00g/cm is carried out to it ³scale; Radioactive fluid densilog instrument sampler chamber is placed in pure water, 1.00g/cm is carried out to it ³scale; Use Logging Software to carry out calibration factor calculating, and preserve;

Three, radioactive fluid densilog instrument is placed in air, the density graduation chi that each length is all identical, width is all identical, highly not identical is put into respectively in sampler chamber, the calibration factor preserved by well logging ground-based system read step two, and recorded stream bulk density show value, set up the tables of data of the density graduation chi of the differing heights density value corresponding with it;

Four, according to step 3 the data obtained table, the height value of the density graduation chi of differing heights when density value error is zero is determined;

Five, according to the height value of the density graduation chi of step 4 gained, density graduation block is made.