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Experimental device and method for evaluating drilling fluid anti-collapse performance

An experimental device, drilling fluid technology, used in earth-moving drilling, wellbore/well components, etc.

Inactive Publication Date: 2019-04-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the anti-slump performance evaluation method adopted at present can only evaluate the strength of the anti-slump performance of drilling fluid according to the quality of inhibition performance or filtration performance, and the experimental results have a practical impact on the anti-slump performance of drilling fluid in actual drilling construction. There is a big difference in the effect

Method used

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  • Experimental device and method for evaluating drilling fluid anti-collapse performance
  • Experimental device and method for evaluating drilling fluid anti-collapse performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] During the test, put the solid column 5 in the middle of the cylinder body 1; weigh 5.0kg of bentonite and 25.0kg of natural hard and brittle mudstone (from the brown hard and brittle mudstone at 3150-3200m in the North 8 well of Sinopec Northeast Oil and Gas Company, structural Location: the southern end of the Dahan fault outburst in the fault depression, geographical location: 2.42km southeast of Longfeng Village, Changling Town, Changling County, Songyuan City, Jilin Province) Joining the annular space between the cylinder body 1 and the solid column 5, in the ring Overburden block 7 is placed on the ground, the mixture of easily hydratable clay and rock samples is compacted to the position of scale line 4, and the overburden block 7 is taken out, thereby simulating the well wall of easily hydratable clay mineral cemented rock in the well.

[0043] The solid column 5 is lifted out by the handle 6, and the filling block 8 is placed on the upper part of the simulated wel...

Embodiment 2

[0047] Using the operation steps and test conditions of Example 1, only the experimental slurry 1 was replaced with the experimental slurry 2, and the washed and dried rock sample in the cylinder 1 was weighed, which was recorded as D1.

Embodiment 4

[0049] Using the operating steps and test conditions of Example 1, only the experimental slurry 1 was replaced with the experimental slurry 3, and the washed and dried rock sample in the cylinder 1 was weighed, which was recorded as D2.

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Abstract

The invention discloses an experimental device and method for evaluating drilling fluid anti-collapse performance. The device comprises a simulated well wall, a fluid loading tank, a simulated drilling tool, a circulating pressure pump, an injecting pressure controller and a computer. The simulated well wall comprises a cylinder body, a heating sleeve, a temperature controller, a solid column, a handle and a covering block. The exterior of the cylinder body is sheathed with the heating sleeve. The heating sleeve is connected with the temperature controller. The cylinder body is provided with ascale line. The solid column is sheathed in the cylinder body. The solid column is provided with the handle. The simulated drilling tool penetrates through a sealing cover and is extended into the cylinder body. The sealing cover is provided with a backflow hole. A backflow pipeline is connected with the backflow hole and the fluid loading tank. A section of a water feeding pipeline is connectedwith a fluid loading pipe, and the other end is connected with the simulated drilling tool after connected with the circulating pressure pump. The side wall of the simulated well wall is provided withan injecting pressure stopper. The injecting pressure stopper is connected with the injecting pressure controller. The circulating pressure pump, the injecting pressure controller and the temperaturecontroller are connected with the computer. The device is capable of evaluating the effect of drilling fluid to well wall stability of washing the well wall in a circulating process, and providing technical support for well wall stability research in a well drilling process.

Description

technical field [0001] The invention relates to the technical field of oil field drilling, and more particularly relates to an experimental device and method for evaluating the anti-collapse performance of drilling fluid. Background technique [0002] The complex situations such as wellbore collapse, borehole shrinkage and formation fracturing that occur during drilling or completion are collectively referred to as wellbore instability, which mostly occur in shale formations. Wellbore instability not only seriously affects geological logging, prolongs drilling cycle and increases drilling costs, but also pollutes reservoirs and causes significant economic losses. The causes of well wall instability are nothing more than inevitable congenital factors and acquired factors caused by drilling construction. Innate factors mainly include: the composition and physical and chemical properties of formation rocks, geological structure type, in-situ stress state, formation dip angle, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 褚奇李涛杨枝王治法杨帆
Owner CHINA PETROLEUM & CHEM CORP
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