CN85201390U

CN85201390U - Continuous measurement device for aq. drilling slurry density

Info

Publication number: CN85201390U
Application number: CN 85201390
Authority: CN
Inventors: 刘克文
Original assignee: Institute Of Drillnig Technology Shengli Oilfield
Current assignee: Institute Of Drillnig Technology Shengli Oilfield
Priority date: 1985-04-09
Filing date: 1985-04-09
Publication date: 1986-02-12

Abstract

The utility model relates to a continuous measurement cevice for aq. Drilling slurry density. The most fundamental principle of hydraulic pressure is applied; a specially designed slurry tower and a special display device are used; the aq. Drilling slurry density can be continuously measured via only the communication of two small air flow. The continuous measurement cevice and the currently used densimeter for the aq. Slurry have no difference in measurement precision. The utility model has the advantages of convenient use, convenient maintenance and visual display; the used is not subjected to the limitation of the power supply and the influences of the factors, such as the temperature, the humidity, etc. Of the field.

Description

Continuous Measurement Device for aq. drilling slurry density

The utility model belongs to the fluid density continuous measuring device.

In drilling engineering, in order to carry out balanced drilling and when the bad ground drilling well, to need the density of continuous coverage drilling mud.The general hydraulic principle measurement fluid density of using can be measured fluid pressure differential with diaphragm, the method for also available ventilation bubbling (as U.S. patent (11) 3,955,411 (45) May11,1976).For continuous coverage must allow the continuous flows through sensor of liquid.The general form that adopts electricity of the transmission of measuring-signal and demonstration, minority also has the method that adopts the demonstration of U-shaped pipe fluid column.

In said method, flowing of liquid has interference to measurement; Circuit will be subjected to the influence of scene temperature, humidity; U-shaped pipe fluid column shows the shortcoming that exists scale not fix simultaneously.The present invention has overcome above-mentioned various shortcoming.

The utility model also can be used to the general fluid density of continuous coverage.

Fig. 1 is the measurement mechanism schematic diagram.Fig. 2 is the measurement mechanism pictorial diagram.Among the figure: 1 is the mud tower, and 2 is the mud import, and 3 is the measuring tube II, 4 is vent port, and 5 are the mud outlet, and 6 is the measuring tube I, 7 is spillway, and 8 is the tracheae line, and 9 is upper chamber, 10 is lower chamber, and 11 is indicator solution, and 12 are the indication glass tube, 13 is flowmeter, and 14 is gas source inlet, and 15 is scaleplate, 16 is digital panel meter, and 17 chew for differential pressure transmitter connects.

Main points of the present utility model are to adopt custom-designed mud tower, and the mud tower is a water tower shape structure, and the tower body internal diameter is 150 to 500 millimeters, and tower height is 300 to 800 millimeters, and two openings are arranged at top, and one is the mud import, and one is overfall; The bottom of tower is infundibulate, and lowermost end is the mud outlet; Outlet diameter is less than inlet diameter. Should make the import mud amount greater than the outlet mud amount during measurement. Two isometric measurement fixing device for tubes of equal diameter are fixed on symmetric position in the tower. Measuring tube respectively has a steam vent. Set up two equal diameter tracheaes, air chamber and measuring tube are coupled together, lower chamber is communicated with the measuring tube I, and upper chamber is communicated with the measuring tube II. Air-flow flows into air chamber by source of the gas through flowmeter during measurement. Arrive by the road measuring tube by air chamber. After mud was drained into steam vent by gas in the measuring tube, unnecessary gas just entered mud and escapes into liquid level from steam vent.

Main points of the present utility model also are to have adopted a kind of special display device.One carefully directs at and shows that glass tube is connected to the upper chamber top from lower chamber bottom, and the lower chamber bottom fills indicator solution.1 to 3 millimeter of indication glass tube internal diameter, long 100 to 600 millimeters, gas chamber volume is 1 to 3 liter up and down.When pressure reduction between last lower chamber changed, indicator solution is lifting in the indication glass tube just, and the fluid column vertical height just indicates the numerical value of mud density.Compared with the prior art this display device had both avoided the conversion from hydraulic pressure to the electric signal, had overcome the U-shaped pipe again and had shown unfixed shortcoming at zero point.

The utility model compares the two mean absolute error △＜0.002, the two average relative error δ＜0.0016 with existing with liquidensitometer aspect measuring accuracy.Advantage of the present utility model is to measure continuously and automatically, and is easy to use, not influenced by the restriction of open-air power supply and environment temperature, humidity factor.

Claims

1, a kind of wellbore mud density continuous measuring device, the utility model adopts custom-designed mud tower, symmetry is placed two measuring tubes in the tower, set up two equal diameter tracheaes between mud tower and the display device, air-flow flows into air chamber by air-flow through flowmeter during measurement, arrive measuring tube with tracheae then, display device is by last, lower chamber, scaleplate and being loaded on, indication glass tube between lower chamber is formed, when last, when pressure reduction changes between following tracheae chamber, indicator solution is lifting in the indication glass tube just, the fluid column vertical height just indicates the density of tested mud on scaleplate, it is characterized in that said mud tower is a water tower shape structure, the tower body internal diameter is 150 to 300 millimeters, tower height is 300 to 600 millimeters, and tower body top is provided with two openings, and the lower hopper bottom is provided with an opening, the upper opening diameter is all greater than the bottom end opening diameter, and two measuring tubes are that the axis of symmetry symmetry is positioned in the mud tower with the tower body axis.

2, according to right 1 said display device, it is characterized in that said upper and lower air chamber, scaleplate and be loaded on indication glass tube between upper and lower air chamber, the upper and lower end of pipe is connected with upper chamber top and lower chamber bottom respectively, upper and lower gas chamber volume is 1 to 3 liter, the lower chamber bottom fills a certain amount of indicator solution, 1 to 3 millimeter of indication glass tube internal diameter, length is 100 to 600 millimeters.

3, according to claim 1 or 2 said measurement mechanisms, it is characterized in that two equal diameter tracheaes being set up between said mud tower and the display device, air chamber and the measuring tube that is positioned at the mud tower are coupled together, lower chamber is communicated with the measuring tube I.Upper chamber is communicated with the measuring tube II, two measuring tube equal diameters, isometric and have vent port at diverse location, and the measuring tube internal diameter is 5 to 30 millimeters, length is 300 to 600 millimeters.