CN1167871A

CN1167871A - Method and apparatus for measuring position of mud loss

Info

Publication number: CN1167871A
Application number: CN 97111751
Authority: CN
Inventors: 李相方; 车仕华; 管丛笑; 隋秀香
Original assignee: China University of Petroleum Beijing
Current assignee: China University of Petroleum Beijing
Priority date: 1997-05-07
Filing date: 1997-05-07
Publication date: 1997-12-17
Anticipated expiration: 2017-05-07
Also published as: CN1060247C

Abstract

A method and its apparatus for quickly and accurately measuring the position of mud loss are disclosed. Said apparatus is composed of tracer, flowmeter, tracer probe, mud loss position measurer, microcomputer and printer. When measuring, tracer along with mud is input to well while time counting begins. The mud flows going in and coming from well are measured. The present of tracer at well head is detected to obtain the time needed by mud travelling a round in well. The well depth where mud loss takes place can be calculated out according to the corss-section over mud loss layer and the time difference and flow difference of mud circulation before and after mud loss occurs.

Description

Measuring position of mud loss method and device thereof

The present invention relates to a kind of measuring position of mud loss method and device thereof.

At present, the method for measurement drop ply position has multiple, is the frictional resistance mensuration of the leakage position of US4346594 as the patent No., and it is that standpipe pressure changes when utilizing leakage, determines the position of drop ply by a cover annular space hydraulic model.Though this method can promptly be obtained drop ply position, but, because it is a lot of to influence the factor of standpipe pressure, remove manifold of ground and pump, down-hole string, outside the factor of nozzle aspect is distinguished easily, drilling fluid types, performance, annular space fluidised form and borehole wall situation etc. are difficult to accurately calculate to the influence of standpipe pressure, and, in common well drilling well, the annular space circulation presses consumption only to account for the sub-fraction of standpipe pressure, and after the leakage, annular space returning fluid amount reduces (or lose and return), only causes that again this sub-fraction standpipe pressure changes, obviously, determine that with this degree of accuracy of leakage position is not high.And for example leak detector and flow rate and direction instrument (LSX-2-Zhongnan Polytechnic Univ), their need with the position that can measure drop ply under the cable in the well, and therefore, time of its cost of leaking hunting is long, and easily is stuck in the well.Use the stifled method of more examination by rule of thumb to determine drop ply position and leak stopping for another example at the scene, its consumed time is long, and blindness is big.

The purpose of this invention is to provide a kind of can be rapidly, exactly to the measuring system of leakage position and hydraulic characteristic(s) under the different drilling conditions, make and handle leakage and have scientific basis.

The object of the present invention is achieved like this:

A kind of measuring position of mud loss method is characterized in:

(1) tracer and mud together enter the well inlet, and pick up counting;

(2) mud flow rate of measurement well import and export;

(3) survey the appearance of tracer, obtain mud and in well, circulate time in a week in the well outlet;

(4) return outflow after time difference, mud entrance flow and the leakage according to one week of mud circulation before and after the above annular space sectional area of lost-circulation zone, the leakage generation, calculate lost-circulation zone place well depth.

A kind of measuring position of mud loss device, be characterized in: this device comprises tracer, flow meter, tracer probe, measuring position of mud loss instrument, microcomputer, printer, tracer together enters the well inlet with mud and exports out from well, flow meter is installed in the mud import and export of well respectively, the tracer probe is installed in the mud exit of well, the measuring position of mud loss instrument is connected with tracer probe and the flow meter that is installed in the mud import and export of well respectively, microcomputer is connected with the measuring position of mud loss instrument, and printer is connected with microcomputer.

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

Fig. 2 is a leakage position calculation schematic diagram of the present invention;

Fig. 3 is float level meter measuring circuit figure of the present invention.

Among the figure: the 1-tracer; The 2-flow instrument; 3-tracer detector; 4-measuring position of mud loss instrument; The 5-A/D plate; The 6-microcomputer; The 7-printer; The 8-lost-circulation zone; The 9-sleeve pipe; The 10-bore hole annulus.

Below in conjunction with embodiment the present invention is further described:

Trace method measuring position of mud loss method and device thereof, this device is made up of tracer, flow meter, tracer detector, measuring position of mud loss circuit, A/D plate, microcomputer, printer.Microcomputer can use compatibles such as COMPAQ486 or IBM, and microcomputer links by A/D plate and measuring position of mud loss instrument, realizes data acquisition and processing.Tracer is the red high-temperature resistance plastice paper of sheet, plastic beads (diameter is 2～4mm, and density and mud are suitable), or liquid (high sticking saturated brine or diesel oil).Flow instrument is the float type level gauge that Shanghai oil instrucment and meter plant makes, and is installed in respectively on the import and export jar of mud circulating system, is used to measure the mud amount into and out of the well circulating system.The tracer detector mainly is made up of the resistivity sensor that oil instrucment and meter plant in Shanghai makes, be contained in the mud circulation exit, be used to detect the resistivity of mud, circulate time (can directly pick up) in a week from vibrosieve for solid tracers thereby measure the liquid tracer.When leakage takes place,, cause the above mud upward velocity of drop ply to reduce, thereby make tracer return out time retardation a period of time △ T on ground because the part mud stratum of bleeding is arranged.Just can try to achieve lost-circulation zone place well depth X according to △ T and import and export mud amount, referring to Fig. 4.

X = \frac{Q_{2} Q}{(Q - Q_{2}) A} ΔT

Q____ mud entrance flow in the formula;

Q ₂Leakage back return of drilling mud of _ _ _ flow;

The above annular space sectional area of A____ lost-circulation zone;

The time difference in one week of mud circulation before and after △ T___ leakage takes place.

The mud circulation week age that records with tracer before the above annular space sectional area of lost-circulation zone A can take place by leakage is calculated, and is adopted trial and error procedure finally to calculate drop ply position.

Trace method measuring position of mud loss instrument is made up of measuring position of mud loss circuit and A/D plate, be used for controlling mud import and export jar float level meter and tracer detector, show test value with voltage signal, and be converted to digital analogue signal input Computer Processing by the A/D plate.

Claims

1. measuring position of mud loss method is characterized in that:

(1) tracer and mud together enter the well inlet, and pick up counting;

(2) mud flow rate of measurement well import and export;

2. measuring position of mud loss method according to claim 1 is characterized in that: the mud circulation week age that records with tracer before the above annular space sectional area of lost-circulation zone can take place with leakage is calculated.

3. measuring position of mud loss device, it is characterized in that: this device comprises tracer, flow meter, tracer probe, measuring position of mud loss instrument, microcomputer, printer, tracer together enters the well inlet with mud and exports out from well, flow meter is installed in the mud import and export of well respectively, the tracer probe is installed in the mud exit of well, the measuring position of mud loss instrument is connected with tracer probe and the flow meter that is installed in the mud import and export of well respectively, microcomputer is connected with the measuring position of mud loss instrument, and printer is connected with microcomputer.

4. measuring position of mud loss device according to claim 3 is characterized in that: the measuring position of mud loss instrument of this device is made up of measuring position of mud loss circuit and A/D plate.

5. measuring position of mud loss device according to claim 3 is characterized in that: the tracer of this device is the visual solid matters of naked eyes.

6. measuring position of mud loss device according to claim 5 is characterized in that: the tracer of this device is red high-temperature resistance plastice paper of sheet or plastic beads.

7. measuring position of mud loss device according to claim 3 is characterized in that: the tracer of this device is a liquid substance.

8. measuring position of mud loss device according to claim 7 is characterized in that: the tracer of this device is high sticking saturated brine or diesel oil.

9. measuring position of mud loss device according to claim 5 is characterized in that: the tracer probe of this device can save.

10. measuring position of mud loss method according to claim 1 is characterized in that: tracer can export mud vibrating screen from well and picks up when tracer was solid matter.