CN101881159A

CN101881159A - Lithology and density logging instrument

Info

Publication number: CN101881159A
Application number: CN200910135974XA
Authority: CN
Inventors: 高怀雪; 黄文帜
Original assignee: BEIJING GI BO-RAN SCIENCE AND TECHNOLOGY Co Ltd
Current assignee: BEIJING GI BO-RAN SCIENCE AND TECHNOLOGY Co Ltd
Priority date: 2009-05-07
Filing date: 2009-05-07
Publication date: 2010-11-10

Abstract

The invention provides a lithology and density logging instrument, which relates to an instrument for measuring formation lithology and the density. The invention is mainly used for the exploration and the development of petroleum and natural gas. Firstly, a heat insulation bottle base is fixed on a metal case of a probe through screws, then, all elements inside the probe are sequentially ranged and fixed in sequence to be encapsulated in a heat insulation bottle, a circuit inside the heat insulation bottle is connected with a circuit board through a multi-core cable, at the same time, an electric wire led out from the multi-core cable is led to the upper end of the probe through a groove arranged on the inner side of the probe case to be connected with an electronic signal processing circuit, and the communication of the whole control circuit is realized.

Description

Litho-density tool

(1), technical field

The present invention relates to a kind of instrument of measuring formation lithology and density, be mainly used in the exploration and development of petroleum and natural gas.

(2), background technology

At present, being used for the litho-density tool of oil well logging, at first is to utilize isotope to stratum radiation gamma ray, utilizes probe to measure intensity through the gamma ray of stratum scattering and absorption again.Then, according to photoelectric absorption and the Compton-Woo effect that Compton-Wu has instruction scattered gamma rays and stratum to act on, measure the rock property and the rock density on stratum simultaneously.But because drilling environment is very abominable, logging instrument will be worked under the condition of HTHP usually.At present, both at home and abroad on all densilog instruments, only be that the electronic signal process circuit is packed in the metal heat preservation bottle, and then be sealed in the metal bearing shell.And the inner circuit part of probe, because technical reason still can't be encapsulated in and realize the high temperature protection function in the vacuum flask.And, the internal placement of common litho-density tool probe complicated circuit, electric wire and gamma-ray source chamber.Litho-density tool among the present invention is after having increased vacuum flask, and the circuit of original probe inside, electric wire, chamber, source etc. are encapsulated in the vacuum flask, have guaranteed like this to pop one's head in and can work under the environment of 175 ℃ of high pressure 140Mpa of high temperature.But, the litho-density tool probe that relates among the present invention, its external diameter does not change, thereby vacuum flask has occupied certain space.Like this, the probe inner space just becomes narrow and small, and it is also more difficult to connect up.

(3), summary of the invention

In order to overcome above problem, the invention provides a kind of litho-density tool, the problem of difficult wiring after it can solve the inner high temperature protection problem of probe and increase vacuum flask.

The technical solution adopted for the present invention to solve the technical problems is: at first vacuum flask base is screwed on the metal shell of probe, the inner all components and parts of will popping one's head in then are arranged in order fixing in order, are encapsulated in the vacuum flask.The circuit of vacuum flask inside is connected with circuit board by a multicore cable, and simultaneously, the fluting of electric wire through the probing shell inboard of being drawn by multicore cable causes the probe upper end, is connected with the electronic signal process circuit, realizes the connection of The whole control circuit.Wherein, the fluting of probing shell inboard is formed by spark machined, and slotting position is in the place little to the probing shell intensity effect, in the enclosure footpath center line 150 directions.Simultaneously, in order to guarantee the intensity of shell, to plate one deck strengthening material at the external surface of probe fluting one side.

Along with going deep into of domestic well logging work, the mining depth in oil field improves constantly.And the output in China gas field is also continuing to increase, and traditional oil producing operation progressively strides forward to gas production.This resistance to elevated temperatures to logger has proposed certain requirement.The present invention just in time can address this problem.

(4), description of drawings

The invention will be further described below in conjunction with accompanying drawing.

Fig. 1 is the litho-density tool schematic diagram;

Fig. 2 is the vacuum flask structural representation;

Fig. 3 is a probing shell front view schematic diagram;

Fig. 4 is a probing shell vertical view schematic diagram;

Fig. 5 is that probing shell A-A is to sectional drawing.

(5), the specific embodiment

With reference to Fig. 1, litho-density tool mainly is made up of probe 6, electronic signal process circuit 4, telescoping ram 5 three parts.The electronic signal process circuit at first is loaded in the metal heat preservation bottle, and then is encapsulated in the metal bearing shell.It is by logging cable 2, transfer of data pipe nipple 3 order of plane system 1 responsively, the work of control logging instrument, the collection, high voltage control, door adjustment, the data that realize valid data send and control PHA plate, and upload gamma energy spectrum and other lithological information.Litho-density tool can directly be articulated on 5700 ground systems.Probe 6 is installed on the telescoping ram 5, and telescoping ram 5 is tightly pushed probe 6 to the borehole wall during well logging.

Among Fig. 2, the vacuum flask internal construction is upper shell 1, storehouse, source 2, window 3, vacuum flask 4, vacuum flask base 5, shield 6, lower house 7, circuit board 8, vacuum flask plug 9.

The probe section is the core component of instrument, and inner probe cans be compared to the heart of instrument, and the detection efficient of probe is the key index of instrument.Probe inside comprises a long and short two probe assembly, two circuit modules and a power module, and the storehouse, source in custom-designed placement 137Cs source.

This instrument in order to satisfy the shielding requirements of selected probe, adopts the form of structure that adds windowing on the shield in design process, core body adopts eccentric orfice, satisfies crystal---photomultiplier back screen effect.

In the schematic diagram 3,4, probing shell 10, probe helmet 11, volume pin 12.

Claims

1. a litho-density tool mainly is made up of electronic signal process circuit 4, telescoping ram 5 and probe assembly 6.The electronic signal process circuit is inner mainly to be made up of the motor of circuit board, connecting line and telescoping ram.Electronic signal process circuit 4 transfers to the circuit board that probing shell is encapsulated in vacuum flask inside with signal after receiving the instruction that ground system 1 transmits, and control probe emission gamma ray is surveyed the formation rock performance.

2. litho-density tool according to claim 1 is characterized in that: increased insulation in the probe, components and parts such as the probe in the probe, circuit board all are encapsulated in the vacuum flask.

3. litho-density tool according to claim 1 is characterized in that: the inner fluting of probing shell, be convenient to cabling.