CN1560432A

CN1560432A - Method for micrometering well by detectors series setted in well

Info

Publication number: CN1560432A
Application number: CNA2004100219161A
Authority: CN
Inventors: 林叶; 叶林; 胡一川; 吴月友
Original assignee: Sichuan Petroleum Administration Bureau
Current assignee: China National Petroleum Corp; Sichuan Petroleum Administration Bureau
Priority date: 2004-02-27
Filing date: 2004-02-27
Publication date: 2005-01-05
Anticipated expiration: 2024-02-27
Also published as: CN1298964C

Abstract

The invention is a method for series micrometering well in silo demodulator, which belongs to geology and mineral exploration technology field. It uses cable to connect the demodulators in well in series, realizes the ground shallow pit explosion activation, the silo demodulator receives, because the demodulator is arranged in the different layer in series, and it can be attached to the well wall by the pushing device, it can acquire accurate and reliable signal of different layers in one time, because of the shallow pit activation, the construction is convenient, the method can be applied to oil earthquake exploration, mineral geology detection, city construction plan project exploration, exploration detection of high building and water conservation shallow geology mineral.

Description

A kind of method of well geophone string data micro logging

Technical field: a kind of method of well geophone string data micro logging, be used for oil seismic exploration, the exploration investigation in ore deposit geological survey, physical construction planning engineering exploration, highrise building and quality ore deposit, hydraulic engineering shallow-layer ground, belong to the technical field of ground quality miner journey exploration.

Background technology: the method that adopts when carrying out the micro logging technology at present is in well shooting, earthquake-wave-exciting, the method that instrument writes down is accepted and reached to surface geophone, way is: according to work area geology, the difference of condition and survey tasks, diameter 75mm is beaten in work area in construction, the above straight well of dark 10m is provided with the blast shot point according to certain interval then in well, excite blast to produce the focus ripple then;

The specific practice of prior art has two kinds:

The one, the pointwise setting, point-by-point excitation: once the explosive of a point is delivered to desired depth, finish just to blow out after being provided with an of point and excite, the seismic wave of a point of register instrument record, and then the explosive of another point delivered to the predetermined degree of depth, blow out after setting is finished again and excite, recorder is record again;

The 2nd, be provided with afterwards earlier and excite: earlier explosive is delivered to one by one each predetermined shot point position of down-hole, and be fixed on this position, after all shot point settings are finished, excite one by one again, gather and record; The shortcoming of two kinds of methods of prior art is: the actual blast shot point degree of depth and the working design degree of depth goodness of fit are poor, because the position of each shot point of down-hole, the stratum, the difference of environment, the energy that blast excites the back to be produced, frequency significant wave characteristic effect is also inequality, therefore the uniformity of seismic data can not get guaranteeing, the method that pointwise is provided with point-by-point excitation causes the borehole wall to collapse easily, and the setting of back can not be carried out, the method of back secondary is set because well head has tens pairs of connecting lines earlier, the more or less freely numbering mistake that causes connecting line, and cause exciting the obstructed of wrong and circuit, short circuit or leaky, the method of prior art also wastes time and energy in force in addition, and labour intensity is very big.

The objective of the invention is: the design shot point that will explode is arranged in the shallow hole on ground, by cable wave detector is arranged on the down-hole by certain distance, the signal of telecommunication that after exciting wave detector is received is delivered to the method for a kind of well geophone string data micro logging that writes down and gather in ground through transmission line.

Summary of the invention: according to the principle of micro logging, excite in the well with prior art, the method that surface geophone receives changes ground shallow hole blast into and excites, the method that well geophone receives, way is: at first make a call to a shallow hole on the ground in construction work area, explosive is arranged in the shallow hole, then with 24 wave detector cores, be fixed on the low electrical cables of 96 pairs of cores according to certain spacing distance, make wave detector form the string data structure, the top sub of low electrical cables inserts the cable connector on ground, insert detecting instrument through the land cable joint again and carry out record, in order to make the wave detector that forms the string data structure in the lower going-into-well can be adjacent to the borehole wall, the 3rd the step be in the wave detector lower going-into-well that will form the string data structure in, with the wave detector G.I.H of a pushing device that forms by canvas hose with the string data structure with the string equal length, before going into the well, the bottom of canvas hose is shut, and be connected a weight with the bottom of the wave detector of string data structure, so that canvas fire hose generation and string G.I.H at canvas hose.

Advantage of the present invention is: owing to be that the hole more shallow on ground excites, be convenient to dig a pit, hole, etc., also cost can be saved,, and under the backup of pushing device, the borehole wall can be adjacent to because wave detector is positioned in the different location of down-hole, so not only once just can obtain the signal of different layers position, and the data of gathering has higher accuracy and reliability, simultaneously, owing to be the signals collecting of once carrying out the multilayer position, so simplified the program of construction greatly, reduced the intensity of work.

Marginal data:

Fig. 1 is a schematic diagram of the present invention.

Specific implementation method: provide most preferred embodiment of the present invention: at first make a call to a shallow well 8 on the ground in construction work area below in conjunction with accompanying drawing, the diameter of shallow well 8 is 50-100mm, the degree of depth 〉=10m, as the blast explosive source, explosive is arranged in the shallow well 8, then with 24 wave detectors 3, spacing distance according to each 0.5m-2m is fixed on the low electrical cables 4 with 96 pairs of cores, make wave detector 3 form string, the top sub of low electrical cables 4 inserts the cable connector 11 on ground, insert detecting instrument 7 through land cable joint 11 again and carry out record, in order to make the wave detector 3 that forms the string data structure in the lower going-into-well 10 can be adjacent to the borehole wall, the 3rd step was: in wave detector 3 lower going-into-wells 10 that will form the string data structure, with one in wave detector 3 lower going-into-wells 10 of the pushing device 2 that forms by canvas hose of string equal length and string data structure, before going into the well, the bottom of pushing device 2 is shut, and be connected a weight 9 with the bottom of the wave detector 3 of string data structure at pushing device 2, so that pushing device 2 and string are brought into the bottom of well 10, pushing device 2 can be formed by canvas hose, also can be empty and inflatable flexible banded structure formation in the middle of other; During work, after weight 9 arrives the bottom of well 10, the string of stretching G.I.H, booster air pump 5 is pushing device 2 inflations under the effect of power supply 6 then, pushing device 2 is expanded, behind pushing device 2 inflations, string will be pushed against on the borehole wall tightly, reach the purpose that string and the borehole wall closely contact; After the focus ripple that the ground shallow well excites is excited, seismic wave can pass to the wave detector 3 of down-hole different depth position by stratum 1, wave detector 3 is transferred to detecting instrument 7 line item of going forward side by side with the signal that receives by low electrical cables 4, so just can finish the micro logging work of a bite well.

Claims

1. the method for a well geophone string data micro logging is characterized in that: this method is at ground shallow well blast earthquake-wave-exciting, receives the seismic wave signal by well geophone, and way is:

The first step is made a call to a shallow well on the ground in construction work area, and the diameter of shallow well is 50-100mm, the degree of depth 〉=10m;

Second step was that the spacing distance of wave detector according to each 0.5m-2m is fixed on the low electrical cables;

The 3rd step was earlier the bottom of pushing device to be shut, and the pushing device that then lower end is connected weight is the pushing device inflation then with the string G.I.H, excites the focus of ground shallow well at last.