CN201802395U

CN201802395U - Dual laterolog tool

Info

Publication number: CN201802395U
Application number: CN2010201071016U
Authority: CN
Inventors: 高怀雪; 黄文帜
Original assignee: JIAI TECHNOLOGY (BEIJING) Co Ltd
Current assignee: Ji AI (Tianjin) Petroleum Engineering Co., Ltd.
Priority date: 2010-02-03
Filing date: 2010-02-03
Publication date: 2011-04-20
Anticipated expiration: 2020-02-03

Abstract

The utility model relates to a dual laterolog tool for measuring the electrical resistivity of a formation, which is mainly applied in the exploratory development of petroleum and natural gas. The dual laterolog tool (DLT) is implemented by arranging electronic circuits in the interior of an electrode system so as to achieve the circuit/probe integration. The DLT can directly replace the component 1229 or 1239 in the system 3700 or 5700 in the prior art to complete the combined logging and can provide the measured values of lateral electrical resistivity at two different depths. In combination with other well logging data, the utility model can visually and accurately detect the permeable formation and determine the oil/water formation, and can determine and evaluate the oil-bearing property of the formation.

Description

Dual laterolog equipment

Technical field

The utility model relates to a kind of instrument of Formation Resistivity Measurement, is mainly used in the exploration and development of petroleum and natural gas.

Background technology

Dual laterolog equipment is by insulating short section, and electronic circuit, electrode system are popped one's head in and bottom electrode is formed.In the well of high resistivity stratum and salt-water mud, it can provide the information of fracture porosity, is the main means of layer resistivity definitely.Along with going deep into of domestic well logging work, the mining environment in oil field is complicated day by day, and the degree of depth 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 stability to logger has proposed certain requirement.Present dual laterolog equipment both domestic and external, vertical resolution is poor, and investigation depth is low, tool length is long, and volume is big, is not easy to construction and implements, and it is not high to measure stability, and bad in dark, the shallow side direction curve repeatability on impermeability stratum, and radial investigation characteristics is poor;

Summary of the invention

In order to overcome above problem, the utility model provides a kind of dual laterolog equipment, and it all is installed in electrode system inside with electronic circuit, and instruments weight is lighter like this, and length is shorter.

Above-mentioned purpose of the present utility model is to realize like this, a kind of dual laterolog equipment, form by insulating short section, electrode system probe and electronic circuit, bottom electrode three parts, wherein, probe is integrated with electronic circuit, electronic circuit is divided into electronic circuit and following electronic circuit, and is assembled in the top and bottom of probe respectively.

In addition, the plate of being responsible for depth side direction power control circuit in the described electronic circuit down is fixed in the absorber, and vacuum flask is enclosed within described absorber outside.

Technique effect of the present utility model is: measured electric current and voltage are realized the power control of depth side direction according to certain calculation method, improved the output and the received signal to noise ratio of power; Adopt double shielding electode, principal current is focused on, reduced the influence of cable, stratum and mud.Electrode adopts stainless steel electrode and glass fibre reinforced plastic insulating cover to form, and has characteristics such as anticorrosive, durable in use, be suitable for the well logging of various stratum, and dismounting is easy to maintenance.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is the dual laterolog equipment schematic diagram;

Fig. 2 is the vacuum flask schematic diagram;

Fig. 3 is last electronics circuit pack schematic diagram;

Fig. 4 is following electronic circuit assembly schematic diagram;

The specific embodiment

With reference to Fig. 1, dual laterolog equipment mainly is made up of insulating short section 1, electrode system probe and electronic circuit 2, bottom electrode 3 three parts.Electronic circuit at first is loaded in the metal heat preservation bottle, and then is fixed on bilateral in the metal bearing shell.Dual laterolog equipment can directly substitute existing 1229 or 1239 in 3700 or 5700 systems, and can finish combination logging, and the measured value of two kinds of different depth side direction resistivity can be provided simultaneously.Cooperate with other well-log informations, can divide permeable formation intuitively and accurately, judge oil-water-layer, determine and evaluation stratum oily property.

Among Fig. 2, the vacuum flask internal construction is probe line 21, fixing hole 22, A10 plate 23, absorber 24, vacuum flask 25, vacuum flask base 26, vacuum flask plug 27,3516 code communication plates.

The pressure balance probe mainly contains the cage ring of one group of annular and the laminates of electrode is formed.The electrode system assembly is installed on the axle core of an insulation; (0.5～1.8mm) makes probe can adapt to the bending of less degree and the change in long term of different heat expansions with the electrode system assembly with the protection gap by compression prestress to be contained in the interior compression spring of A1 electrode; compression prestress obtains by the following pipe nipple of tightening on the axle, guarantees sealing with " O " RunddichtringO.In the upper end of pressure balance probe preamplifier is housed, probe inside is full of silicone oil.In addition, the downhole electronics core shell is arranged as the A2 electrode, another the same long metal shell with A2 is as A2 ' electrode, and it hangs over the lower end of pressure balance probe.

Fig. 3 has shown last circuit pack 31, alignment pin 32, fixed screw 33.

Fig. 4 has shown alignment pin 41, ply-yarn drill 42, lower casing 43, following circuit pack 44.

This instrument is realized the power control of depth side direction to measured electric current and voltage according to certain calculation method, has improved the output and the received signal to noise ratio of power; Adopt double shielding electode, principal current is focused on, reduced the influence of cable, stratum and mud.This electrode apparatus adopts stainless steel electrode and glass fibre reinforced plastic insulating cover to form, and has characteristics such as anticorrosive, durable in use, be suitable for the well logging of various stratum, and dismounting is easy to maintenance.

Electronic circuit 2 comprises two parts, last electronic circuit and following electronic circuit.At first will descend electronic circuit to be responsible for the A10 plate of depth side direction power control circuit, be fixed in the absorber 24, with screw absorber is fixed, then vacuum flask 25 is enclosed within absorber 24 outsides, the rotation screw thread, make electronic circuit be encapsulated in vacuum flask inside fully, again vacuum flask base 26 is screwed in the metal bearing shell of instrument.The circuit of vacuum flask inside is connected with electrode system is inner by three 17 core plugs, and simultaneously, the power cable of being drawn by multicore cable is connected with probe circuit the probe lower end through causing of tool housing inboard, realizes the connection of control circuit.At last sealing ring is rotated thread set in the probe lower end, thereby realize the installation of electronic circuit down.For following electronic circuit, the following electronic circuit of the dual laterolog equipment in the utility model has guaranteed that electronic circuit can work under the environment of about 195 ℃ of high temperature after having increased vacuum flask.Last electronic circuit is installed in the upper end of probe, is divided into supervisory electronic circuit, scale change-over circuit, depth lateral current source, voltage and current measuring circuit.Upward line component is the high temperature high voltage resistant electronic devices and components, does not use the insulation measure so go up electronic circuit, directly once arranges in order to be fixed on the instrument support, then cover envelope sealing ring.

In addition, this instrument is realized the power control of depth side direction to measured electric current and voltage according to certain calculation method, has improved the output and the received signal to noise ratio of power; Adopt double shielding electode, principal current is focused on, reduced the influence of cable, stratum and mud.This electrode apparatus adopts stainless steel electrode and glass fibre reinforced plastic insulating cover to form, and has characteristics such as anticorrosive, durable in use, be suitable for the well logging of various stratum, and dismounting is easy to maintenance.

Claims

1. dual laterolog equipment, form by insulating short section (1), electrode system probe and electronic circuit (2), bottom electrode (3) three parts, it is characterized in that: probe is integrated with electronic circuit, electronic circuit is divided into electronic circuit and following electronic circuit, and is assembled in the top and bottom of probe respectively.

2. dual laterolog equipment according to claim 1 is characterized in that: the plate of being responsible for depth side direction power control circuit in the described electronic circuit down is fixed in the absorber, and vacuum flask is enclosed within described absorber outside.