Drilling fluid leakage determining instrument

Abstract

The invention provides a drilling fluid leakage determining instrument. The drilling fluid leakage determining instrument comprises a measuring instrument mainly composed of an upper positioning joint, a lower centralizer, a flow guide pipe component, a pressure and temperature measuring component, an electronic measurement and control component, an upper centralizer and a male gun head which are connected with one another, wherein a rotor flow meter is arranged in the flow guide pipe component; the pressure and temperature measuring component comprises a pressure and temperature sensor; the electronic measurement and control component comprises a system controller, a data memory and a power supply. The drilling fluid leakage determining instrument further comprises an outer barrel short joint and cable transmission equipment, wherein the outer barrel short joint forms a butt joint relation with the upper positioning joint of the measuring instrument, and the cable transmission equipment forms butt joint with the male gun head of the measuring instrument. The drilling fluid leakage determining instrument provided by the utility model adopts three ways of pressure, flow rate and temperature to perform measurement and comprehensive analysis on drilling fluid leakage positions so as to accurately obtain leakage horizons. The instrument is mounted at a position close to a drill bit in the form of the short joint and can perform leakage position measurement after leakage occurs and transmit data in a down-into-cable butt joint way, thereby avoiding well control risk caused by the fact that a drilling tool is out of a downhole.

Description

technical field [0001] The invention relates to a drilling fluid leakage judging instrument in the field of oil and gas drilling detection instruments, in particular to an instrument for judging the leakage layer. Background technique [0002] During oil and gas drilling, wellbore stability is a widespread problem. It is very harmful and usually causes some complex problems downhole. The key to the plugging work is to determine the position of the lost zone as soon as possible after the lost circulation occurs, so as to take effective plugging measures in time to ensure the normal drilling. But so far, there is no more accurate method for determining the location of the leak, or some have limitations, which are not suitable for judging the location of the leak in the case of complex leaks. my country began to develop leakage measurement instruments in the 1970s. Most of these instruments were developed with the help of the principle of fluid dynamics. It either converts th...

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Problems solved by technology

[0003] 1. The accuracy of determining the position of the leakage layer is poor, which affects the success rate of plugging

[0004] 2. After lost circulation, cable or drill pipe is used to measure, which has certain risks. For example, the collapse of the well wall may easily cause pipe sticking accidents, and the construction is more complicated;

[0005] 3. Most of the instruments need to be tripped out after leakage occurs, and then lowered into the instrument for measurement

This not only increases the risk of well control, but also makes the construction complicated and cumbersome

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