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A while-drilling identification method and device for the sizes of caves

A karst cave and while-drilling technology, applied in earthwork drilling, instrumentation, electrical digital data processing, etc., can solve problems such as unpredictability, unrecognizable karst cave size, economic loss, etc., and achieve the effect of accurate karst cave size

Active Publication Date: 2017-09-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, karst caves are often developed in carbonate reservoirs, and the size of the karst caves ranges from a few meters to tens of meters. During the drilling process, it is impossible to predict whether the karst caves will be drilled ahead or to identify the size of the karst caves that will be drilled ahead. , often lead to serious production accidents and economic losses

Method used

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  • A while-drilling identification method and device for the sizes of caves
  • A while-drilling identification method and device for the sizes of caves
  • A while-drilling identification method and device for the sizes of caves

Examples

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Embodiment 1

[0029] figure 1 A schematic flow chart of a method for identifying cave sizes while drilling provided in Embodiment 1 of the present invention, as shown in figure 1 As shown, the method of this embodiment may include:

[0030] Step 101: Establishing a mechanical model of the reservoir for each size of cave according to multiple preset cave sizes;

[0031] The mechanical model of the reservoir can be a geometric model of various shapes, for example, it can be a cube model containing caves of different sizes inside. The caves contained in the cube model are ellipsoidal, and caves of different sizes have different lengths of major and minor axes. The combination of major axis length and minor axis length of the cave establishes the mechanical model of its reservoir. At the same time, the side lengths of cube models containing caves of different sizes are the same.

[0032] In the cube model, the x and y axes are the horizontal axes, and the z axis is the vertical axis. The ge...

Embodiment 2

[0047] figure 2 A schematic flow chart of a method for identifying cave sizes while drilling provided in Embodiment 2 of the present invention, as shown in figure 2 As shown, the method of this embodiment may include:

[0048] Step 201: Determine the physical and mechanical parameters of reservoirs corresponding to caves of different sizes according to multiple preset cave sizes;

[0049] The mechanical model of the reservoir can be a geometric model of various shapes, for example, it can be a cube model containing caves of different sizes inside. The caves contained in the cube model are ellipsoidal, and caves of different sizes have different major axis lengths and minor axis lengths. The combination of major axis length and minor axis length of the cave establishes the mechanical model of its reservoir. At the same time, the side lengths of cube models containing caves of different sizes are the same.

[0050] In the cube model, the x and y axes are the horizontal axe...

Embodiment 3

[0093] image 3 A schematic diagram of a cave-sized identification-while-drilling device provided in Embodiment 3 of the present invention, as shown in image 3 As shown, the device of this embodiment may include: a construction module 31, a first calculation module 32, a second calculation module 33, a third calculation module 34, and an identification module 35;

[0094] Wherein, the construction module 31 is used to establish a mechanical model of the reservoir for each size of the cave according to a plurality of preset cave sizes;

[0095] The first calculation module 32 is used to calculate the in-situ stress field of the reservoir distributed around the cave with the cave as the center according to the mechanical model of the reservoir;

[0096] The second calculation module 33 is used to calculate the relationship between the depth of the reservoir and the distortion energy density of the reservoir according to the in-situ stress field;

[0097] The third calculation...

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Abstract

The invention provides a while-drilling identification method and device for the sizes of caves. The method comprises the steps of building mechanical models of reservoirs containing caves with preset sizes; according to the mechanical models of the reservoirs and calculating geostress fields of the reservoirs distributed around the caves with the caves as centers; calculating a relation between the depths of the reservoirs and the distortion energy densities of the reservoirs according to the geostress fields; according to the relation between the depths of the reservoirs and the distortion energy densities of the reservoirs and a relation between distortion energy densities and drill reaction torques measured by experiments , determining a theoretical value of the drill reaction torques and the depths of reservoirs; acquiring an actually measured value of a drill reaction torque of a target cave reservoir, and comparing the actually measured value and the theoretical value to determine the mechanical model corresponding to the target cave reservoir and determine the size of the cave. The method and the device can accurately predict the sizes of caves in reservoirs.

Description

technical field [0001] The invention relates to the field of oil and gas exploration and development, in particular to a method and device for identifying the size of a cave while drilling. Background technique [0002] Reservoir is the place where oil and gas occur, and it is also the direct target layer of oil and gas exploration and development. For example, karst caves are often developed in carbonate reservoirs, and the size of the karst caves ranges from a few meters to tens of meters. During the drilling process, it is impossible to predict whether the karst caves will be drilled ahead or to identify the size of the karst caves that will be drilled ahead. , often lead to serious production accidents and economic losses. [0003] Identifying the size of caves in reservoirs during drilling has always been an international problem. Therefore, a method for accurately predicting the size of caves in reservoirs is urgently needed. Contents of the invention [0004] The ...

Claims

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Application Information

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IPC IPC(8): G06F17/50E21B49/00
CPCE21B49/00G06F30/20G06F2119/06
Inventor 赵斌朱光有
Owner PETROCHINA CO LTD