CN202596620U

CN202596620U - Novel floating ball type slurry outlet flow detection meter

Info

Publication number: CN202596620U
Application number: CN 201220225329
Authority: CN
Inventors: 谢冲; 程俊丰; 刘清友; 王国荣
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2012-05-18
Filing date: 2012-05-18
Publication date: 2012-12-12
Anticipated expiration: 2022-05-18

Abstract

The utility model discloses a novel floating ball type mud outlet flow detector, which comprises a throttle tube (4), a sensor (1), a floating ball (2), a calculation and display alarm unit (8), a throttle tube ( 4) It consists of a rectangular throttling assembly (6) and a bell-mouth throttling assembly (7) located at both ends of the rectangular throttling assembly (6). The throttling tube (4) is installed on the drilling fluid outlet pipeline (5). The flow assembly (6) is equipped with a floating ball (2), and the sensor (1) is installed above the rectangular throttle assembly (6). The sensor (1) is connected to the floating ball (2) through the connecting rod (3), and the sensor (1) It is electrically connected with the calculation and display alarm unit (8) of the upper computer. The utility model solves the problems of low accuracy and lag in reflection of the current mud return pipe flowmeter. The measurement section adopts a rectangular section instead of a traditional circular section, so that the liquid flow section and the liquid level have a linear relationship, and the result is more accurate.

Description

A kind of novel floating-ball formula mud-outlet-flow detector

Technical field

The utility model belongs to the oil and gas well drilling technical field of measurement and test, relates to a kind of channel flow flow detector, particularly a kind of drilling fluid return flow checkout gear that is used for well kick, leakage alarm.

Background technology

In drillng operation, oil and gas exploitation is a kind of excessive risk work.In the exploration and development process, come equilibrium strata pressure through injecting drilling fluid to pit shaft, in a single day this balance is destroyed, and drilling fluid leakage and formation gas will occur and invade well, and bad phenomenon such as well kick and leakage take place.In recent years; The survey area emphasis turns to the complicated area of structure in front of the mountains, the face of land; Since receive the stress effect of the strong structure of different directions, mature fault, stratum badly broken, and the leakage incidence is high; And account for 5～8% of drilling well total time the loss of time that leakage causes, thereby seriously restricted the drilling engineering progress.Aspect the well kick blowout; Because a variety of causes causes formation fluid to flow into pit shaft, make that the interior drilling fluid of well is continuous or be interrupted ejection, in the drilling process in case well kick is out of hand; Then develop into blowout; And blowout out of control may cause serious consequence, except causing the wasting of resources, environment pollution, also can cause serious consequences such as equipment breaking-up, oil gas well are scrapped, casualties.

In the Process of Oil Well Drilling; It is one of important parameter of prevention blowout well kick in oil and the geological drilling work that outflow is returned in outlet; How accurately measuring mouthful flow becomes the problem of always exploring in the oil drilling, and especially with regard to drilling well, measuring and exporting the basic goal of returning outflow is the size of confirming whether rate of discharge changes and change on normal basis; Abnormal conditions generations such as overflow have been judged whether; Thereby take measures early, avoid the generation of accident, reduce life and property loss.But, the at present normal target type meter that adopts, its target plate is prone to adhere to the mud caking in drilling fluid, has a strong impact on certainty of measurement, especially when flow hour, error is bigger; Meanwhile, other electronic grout flow meters also all exist mud to be prone to cause problems such as sensor failure attached on the sensor.And the discontented tubulose attitude of outlet mud and the irregular certainty of measurement that also influences the current flux meter greatly of size of returning out pipeline.

The utility model content

The purpose of the utility model promptly is to overcome the deficiency of prior art; A kind of flow that mud refluxes that detects is provided; And with this as a kind of novel floating-ball formula mud-outlet-flow detector of judging the foundation whether mud occurs missing, adopt traditional strokes per minute flow instrument, measure the injection flow of mud accurately; Use the utility model again and detect the backflow mud flow rate; Variation tendency to inflow and outflow mud ratio is analyzed, and can be used as the test basis of well kick or lose returns, in case well mud leakage occurs or gas cut takes place; Just can in time take suitable well control measure to prevent blowout to take place, solve problems such as present mud return duct flow meter precision is not high, reflection hysteresis.

The purpose of the utility model realizes through following technical scheme: a kind of novel floating-ball formula mud-outlet-flow detector; It comprises throttle pipe, sensor, ball float and calculating and display alarm unit; Throttle pipe is made up of rectangle orifice union and the horn mouth orifice union that is positioned at rectangle orifice union two ends; Throttle pipe is installed on the drilling fluid outlet line, establishes ball float in the rectangle orifice union, and rectangle orifice union top is equipped with sensor; Sensor is connected with ball float through connecting rod, and sensor is electrically connected with the calculating and the display alarm unit of host computer.

The beneficial effect of the utility model is:

(1) the utility model provides a kind of novel floating-ball formula mud-outlet-flow detector; Problems such as present mud return duct flow meter precision is not high, reflection hysteresis have been solved; Measuring section adopts the square-section to replace traditional circular cross-section; Make flow cross section and liquid level linear, the result is also more accurate;

(2) the utility model provides a kind of novel floating-ball formula mud-outlet-flow detector; Ball float is installed on the sensor built on stilts on the rectangle throttle pipe; When mud flow, ball float under the effect of mud, do around the rolling in the center of circle and on sensor connecting rod rotate, according to the velocity of rotation of ball float and the drift angle of connecting rod; Calculate liquid level and flow velocity, thereby calculate flow; According to mud liquid level and the geometric pipeline shape surveyed; Calculate the cross section of slurry flows in the pipeline; Utilize the Mathematical Modeling of fluid velocity profile that the liquid surface speed of being surveyed is converted into slurry flows average speed, adopt flow velocity-area method to calculate the instant flow of mud at last.Judge whether to occur overflow and leakage with the gained result with the difference that pumps into the instant flow of drilling well liquid measure in the well, difference takes place for leakage just is described, difference takes place for negative explanation overflow.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the A-A face sectional view of Fig. 1;

Among the figure, the 1-sensor, the 2-ball float, the 3-connecting rod, the 4-throttle pipe, 5-drilling fluid outlet line, 6-rectangle orifice union, 7-horn mouth orifice union, 8-calculates and the display alarm unit, the 9-pit shaft.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is done further description, but the protection domain of the utility model is not limited to the following stated.

Like Fig. 1, shown in Figure 2, a kind of novel floating-ball formula mud-outlet-flow detector, it comprises throttle pipe 4, sensor 1, ball float 2 and calculating and display alarm unit 8; Throttle pipe 4 is made up of rectangle orifice union 6 and the horn mouth orifice union 7 that is positioned at rectangle orifice union 6 two ends, and horn mouth orifice union 7 is used for buffering inlet drilling fluid, and rectangle orifice union 6 is the flow detection district; The flow sectional area and the liquid level of detection zone are proportional; Throttle pipe 4 is installed on the drilling fluid outlet line 5, and the backflow mud after process is measured flows to vibrosieve through the port of export of drilling fluid outlet line 5, establishes ball float 2 in the rectangle orifice union 6; Rectangle orifice union 6 tops are equipped with sensor 1; Sensor 1 is connected with ball float 2 through connecting rod 3, and connecting rod 3 rotates around sensor 1 with the liquid level fluctuation, and ball float 2 flows with liquid level and rotates around the center of circle; Ball float 2 is difficult for adhering to mud; And be convenient to cleaning and replacing, sensor 1 is electrically connected with the calculating and the display alarm unit 8 of host computer, is used to accomplish measurement, demonstration and the warning of drilling fluid return flow.

The course of work of the utility model: when mud flow; Ball float 2 is under the effect of mud; Along with rising, the decline of mud liquid level are moved accordingly; And roll along with flowing of mud, thereby drive the some position device axle rotation that sensor 1 links to each other with connecting rod 3, cause that an output resistance of position device changes thereupon; Meanwhile; Ball float 2 passes to sensor 1 through connecting rod 3 with its rotary speed data with slurry flows; Sensor 1 sends the data that receive the calculating and the display alarm unit 7 of host computer to through cable, calculates and display alarm unit 7 calculates mud average speed and flow sectional area according to the flow rule, and calculates instant flow and be presented on the liquid crystal display according to speed-area method; Judge whether to occur overflow and leakage with the gained result with the difference that pumps into the instant flow of drilling well liquid measure in the well; Difference takes place for leakage just is described, difference starts acoustooptic alarm system for negative explanation overflow takes place when drilling fluids outlet flow generation ANOMALOUS VARIATIONS.

Claims

1. novel floating-ball formula mud-outlet-flow detector; It is characterized in that: it comprises throttle pipe (4), sensor (1), ball float (2) and calculating and display alarm unit (8); Throttle pipe (4) is made up of rectangle orifice union (6) and the horn mouth orifice union (7) that is positioned at rectangle orifice union (6) two ends; Throttle pipe (4) is installed on the drilling fluid outlet line (5), establishes ball float (2) in the rectangle orifice union (6), and rectangle orifice union (6) top is equipped with sensor (1); Sensor (1) is connected with ball float (2) through connecting rod (3), and sensor (1) is electrically connected with calculating and display alarm unit (8) of host computer.