A method for draining drilling fluid downhole
A drilling fluid and drilling tool technology, which is applied in wellbore/well parts, earthwork drilling and production, etc., can solve the problem that the formation information of the drill bit cannot be detected in real time, achieve significant economic and social benefits, improve identification accuracy, reduce Effects of Labor Amount and Labor Intensity
Active Publication Date: 2017-02-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, due to the influence of various factors in the drilling process, it is impossible to truly detect the formation information at the drill bit position in real time
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[0012] Below in conjunction with accompanying drawing, the present invention will be further described: as shown in the figure, a kind of downhole drainage drilling fluid method, this method is made up of motor (1), rotating cam (2), cylinder (3), dividing plate (4), connecting rod (5), inlet pressure sensor (6), inlet solenoid valve (7), piston (8), drilling tool nipple (9), driving bevel gear (10), driven bevel gear (11), fixed cam (12 ), an outlet pressure sensor (13), an outlet solenoid valve (14), and a program control unit (15). The motor (1), the driving bevel gear (10) and the driven bevel gear (11) are packaged in a sealed box, and the box is welded on the inner wall of the drill nipple (9), and the rotating cam (2) is installed on the The shaft end of the movable bevel gear (11) and the fixed cam (12) are installed on the upper piston (8) of the cylinder (3); The partition (4) is divided into upper and lower air chambers, the piston (8) is connected by a connecting ...
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The invention relates to an underground drilling fluid draining method. The underground drilling fluid draining method is performed by using a motor, a rotation cam, an air cylinder, a dummy plate, a connection rod, an inlet pressure sensor, an inlet electromagnetic valve, a piston, a drilling tool short section, a drive bevel gear, a driven bevel gear, a fixing cam, an outlet pressure sensor, an outlet electromagnetic valve and a procedure control unit. Drilling fluid flows in the drilling tool short section from the top down. The motor rotates under control of the procedure control unit, and drives the drive bevel gear to rotate. When a convex point of the rotation cam gradually approaches a convex point of the fixing cam, the piston moves downwards, the volume of an upper air chamber becomes small due to pressure increases, and the volume of a lower air chamber becomes large due to pressure decay, and when the inlet pressure sensor detects the information that pressure in the lower air chamber is lower than pressure in an annular space by a certain value, the information is fed back to the procedure control unit, then switching on and switching off of the inlet electromagnetic valve are controlled through the procedure control unit, the drilling fluid in the annular space can enter the lower air chamber from an inlet pipeline, and needed drilling fluid is obtained.
Description
technical field [0001] The invention relates to a surface gas detection technology for oil field drilling and logging, especially a drilling fluid drainage while drilling downhole, which provides quantitative gas-liquid separation drilling fluid for gas detection while drilling downhole or directly provides quantitative drilling fluid for detector detection A downhole drainage drilling fluid method. Background technique [0002] In oil drilling and logging, there are usually three methods for degassing drilling fluid: crushing the drilling fluid, using mechanical agitation to make the gas in the drilling fluid easy to decompose, and enhancing natural gas release; increasing the temperature of the drilling fluid to dissolve the gas in the drilling fluid. The adsorbed gas is easy to decompose; the pressure of the drilling fluid is reduced, which facilitates the desorption of the gas and allows the gas to escape. The drilling fluid required by the three methods of degassing co...
Claims
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IPC IPC(8): E21B49/08
Inventor 刘其春姚金志万亚旗陈琳周发举吴刚章江海普登岗
Owner CHINA PETROLEUM & CHEM CORP