Surface borehole volume determining method

A wellbore and volumetric technology, applied in the direction of wellbore/well components, measurement, earthwork drilling and production, etc., can solve the problems of material waste, cementing slurry waste, efficiency reduction, etc.

Inactive Publication Date: 2005-10-05
CNOOC TIANJIN BRANCH +1
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Problems solved by technology

However, the amount of cement slurry calculated by the above method is inaccurate, sometimes resulting in waste of cement slurry, and sometimes there is a risk that the cement slurry will not return to the wellhead
This approach will inevitably result in a reduction in efficiency and a waste of materials.
[0004] Similarly, when drilling in other surface environments, there is also the problem that it is difficult to determine the amount of cement slurry

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Embodiment Construction

[0014] The present invention is based on the principle that after each well is drilled, the borehole must be cleaned with drilling fluid. When the surface well is filled with drilling fluid, the drilling fluid will return to the outlet. At this time, it will be observed that the drilling fluid overflows the wellhead. By calculating the total amount of drilling fluid injected into the wellbore during the process from pumping the drilling fluid to the return of the drilling fluid from the wellbore, the volume of the wellbore can be accurately calculated, so that the amount of cementing slurry can be accurately calculated.

[0015] The method for measuring surface wellbore volume and the method for measuring the amount of cementing slurry of the present invention are widely applicable to various drilling activities, and are not affected by drilling methods, drilling equipment, drilling fluids used in the drilling process, cementing methods, cementing Equipment, cementing reagents,...

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Abstract

Sea oil-filed develop clump of type well drilling work, the surface layer well drilling work usually uses the centralism well drilling, fast well drilling operation method. Because the superficial well drilling uses open circle, the sea water sneaks in, well-eye's rate of extend changes in a big way, well-eye the volume calculates with difficulty. Therefore, the well cementation cement mortar quantity determines with difficulty. The former procedure was in drilling the perfect number mouth well in the foundation depends on the accumulation the experience carries on the computation, this method inevitably could create the well cementation cement mortar the waste, sometimes also possibly had to brave cement mortar not to return well head risk. Uses this invention the surface layer well-eye volume measuring method, may precisely calculate well-eye volume, thus quite accurately figures out of the well cementation cement mortar the amount are used.

Description

technical field [0001] The invention relates to a method for measuring surface wellbore volume during drilling, and a method for accurately obtaining cementing slurry dosage according to the measured wellbore volume. The method is particularly suitable for use in offshore oil drilling. Background technique [0002] In the drilling operation of cluster wells in offshore oilfield development, the surface drilling operation usually adopts the method of concentrated drilling and rapid drilling. Since surface drilling adopts open-circuit circulation and seawater drilling, and the expansion rate of each wellbore is quite different, it is difficult to calculate the volume of the wellbore, so the amount of cement slurry is difficult to determine. [0003] The usual practice is to roughly calculate the amount of cementing slurry required based on accumulated experience on the basis of several wells drilled. However, the amount of cement slurry calculated by the above method is inacc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/003
Inventor 张春阳张滨海
Owner CNOOC TIANJIN BRANCH
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