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Laser perforation system and laser perforation method

A laser and laser technology, applied in earth-moving drilling, fluid production, wellbore/well components, etc., can solve problems such as perforation depth limitation and laser energy density reduction, and achieve the effect of increasing depth

Active Publication Date: 2018-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the laser beam penetrates the rock surface and forms a perforation hole with a certain depth, the laser beam acting on the bottom of the perforation hole has diverged, which reduces the laser energy density at the bottom of the perforation, which in turn limits the depth of the perforation

Method used

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  • Laser perforation system and laser perforation method
  • Laser perforation system and laser perforation method
  • Laser perforation system and laser perforation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] like figure 1 As shown, the laser perforation system provided in this embodiment includes:

[0063] laser 1;

[0064] a sensor 4 for detecting the position of the bottom of the formed perforation; and

[0065] The controller 3 is configured to control the operation of the laser 1, and move the laser 1 along the optical path based on the measurement results of the sensor 4, so that the focus of the laser light emitted by the laser 1 is at the bottom of the formed perforation hole.

[0066] When in use, the laser 1 emits light for the first time and forms a perforation hole on the surface of the object to be perforated; then the laser 1 is turned off, and the sensor 4 measures the position of the bottom of the formed perforation hole, and then uses the controller 3 to control the adjustment The laser 1 moves so that the focus of the laser light of the laser 1 is at the bottom of the formed perforation hole, and finally the laser 1 emits light for the second time to cont...

Embodiment 2

[0086] like Figure 5 As shown, this embodiment provides a laser perforation method, including:

[0087] Step 20, make the laser emit light for the first time, and form a perforation on the surface of the object to be perforated;

[0088] Step 30, adjusting the distance between the emitting end of the laser and the bottom of the perforation hole, so that the focus of the laser light emitted by the laser is at the bottom of the perforation hole;

[0089] Step 40, make the laser emit light for the second time, and continue processing the perforation hole on the basis of the perforation hole.

[0090] In the laser perforation method provided in this embodiment, after the laser emits light for the first time, the distance between the laser and the bottom of the formed perforation hole is adjusted so that the focus of the laser moves to the bottom of the perforation hole, and then the laser is used to The second perforation is carried out to realize the deepening of the perforati...

Embodiment 3

[0093] like Figure 6 As shown, the laser perforation method provided in this embodiment includes:

[0094] Step 10, adjusting the position of the laser so that the emitting end of the laser forms a preset distance from the surface of the object to be perforated;

[0095] Step 20, make the laser emit light for the first time, and form perforation holes on the surface of the object to be perforated;

[0096] Step 31, using a sensor to measure the position of the bottom of the perforation hole;

[0097] Step 32, moving the laser according to the measured position of the bottom of the perforation hole, thereby adjusting the distance between the emitting end of the laser and the bottom of the perforation hole;

[0098] Step 40, make the laser emit light for the second time, and continue processing the perforation hole on the basis of the perforation hole.

[0099] In this embodiment, step 20 is the same as or similar to step 20 in the first embodiment, and will not be repeated ...

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Abstract

The invention provides a laser perforating system. The laser perforating system comprises a laser device, a sensor for detecting the bottom position of a formed perforating hole, and a controller configured to control the operation of the laser device and to move the laser device in the optical path direction based on a measurement result of the sensor so as to enable the focal point of laser emitted by the laser device to be positioned at the bottom of the formed perforating hole and to effectively increase the depth of the perforating hole. The invention provides a laser perforating method; after the laser device emits light for the first time, the distance from the laser device to the bottom of the formed perforating hole is adjusted to enable the focal point of the laser device to be positioned at the bottom of the formed perforating hole; and then, the second time of perforation is performed to realize the deepening of the perforating hole so as to effectively increase the depth of the perforating hole.

Description

technical field [0001] The invention relates to a laser perforation system and a laser perforation method thereof, belonging to the technical field of petroleum drilling perforation. Background technique [0002] Oil well perforation technology belongs to a kind of oil well completion technology, which specifically refers to opening up the casing wall, cement ring layer and oil and gas reservoir to establish a flow channel between the oil and gas reservoir and the wellbore. [0003] The commonly used perforation technologies include bullet perforation technology and energy-concentrated perforation technology, etc., but there are many problems when using the above perforation technologies. For example, the impact and extrusion of perforating bullets on rocks in oil and gas reservoirs will create a compaction zone around the borehole, reducing the permeability of the rock, resulting in a reduction in oil well productivity; at the same time, the rock debris generated during the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/11E21B43/119
CPCE21B43/11E21B43/119
Inventor 彭汉修姚志良何祖清李斌王征沈义
Owner CHINA PETROLEUM & CHEM CORP