Multi-initiation-point multi-stage blasting fracturing method for horizontal well of shale gas reservoir

A technology for blasting fracturing and horizontal wells, which is used in earth-moving drilling, wellbore/well components, and production fluids. , Increase penetration depth, safe and reliable performance

Pending Publication Date: 2022-01-11
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Explosion fracturing technology includes single-pulse and multi-stage pulse. The fractures produced by single-pulse are relatively short, difficult to extend to the depth of favorable layers, and the fracture network diversion effect is poor. Multi-stage pulse fracturing technology prolongs the impact of high-energy gas on the formation. The effective time of fracturing is strengthened. In order to achieve deep penetration, extend the length of fractures, enhance the communication between fractures to form complex fracture networks, and improve the stimulation of shale gas wells, it is necessary to improve the existing multi-stage pulse technology. The charge amount and the utilization rate of fracturing agent energy are improved to realize high-efficiency production increase of shale gas wells. Therefore, the present invention proposes a multi-initiation point multi-stage explosion fracturing method for horizontal wells in shale gas reservoirs to solve the problem of existing technologies. problems in

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  • Multi-initiation-point multi-stage blasting fracturing method for horizontal well of shale gas reservoir
  • Multi-initiation-point multi-stage blasting fracturing method for horizontal well of shale gas reservoir
  • Multi-initiation-point multi-stage blasting fracturing method for horizontal well of shale gas reservoir

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Embodiment 1

[0037] according to figure 1 As shown, this embodiment proposes a multi-stage detonation fracturing method for horizontal wells in shale gas reservoirs with multiple initiation points, including the following steps:

[0038] Step 1. Filter the area

[0039] Firstly, according to the logging data and core analysis, the geological parameters of the reservoir are obtained as a reference, and the favorable area for development is selected, and then the fracturing target interval is confirmed, and the perforation position is determined according to the obtained geological parameters of the reservoir. Parameters include reservoir rock mineral composition, porosity and permeability;

[0040] Step 2. Horizontal well installation

[0041] Determine the position of the target window according to the fracturing target interval confirmed in step 1, and then complete the drilling, cementing and completion of the shale gas horizontal well in the favorable area selected in step 1;

[0042...

Embodiment 2

[0051] according to Figure 2-3 As shown, the first step is to obtain the geological parameters of the reservoir. Through core analysis and logging interpretation, key parameters such as mineral composition, permeability, porosity, Poisson’s ratio and gas content of the reservoir are obtained. Geological conditions select the fracturing target layer, after selection, determine the target window according to the target layer, design the horizontal well trajectory and wellbore structure, use the directional drilling rig to complete the horizontal well construction, run the casing 2 into the well, and finally inject Drilling fluid 3 is used for well completion.

[0052] Secondly, the perforation position is determined according to the obtained reservoir geological parameters, and a higher perforation density is selected to obtain greater productivity. Due to the long horizontal section of the horizontal well, it is required that the perforation operation be successful once, so th...

Embodiment 3

[0057] according to figure 1 As shown, this embodiment proposes a multi-stage detonation fracturing method for horizontal wells in shale gas reservoirs with multiple initiation points, including the following steps:

[0058] Step 1. Filter the area

[0059] Firstly, according to the logging data and core analysis, the geological parameters of the reservoir are obtained as a reference, and the favorable area for development is selected, and then the fracturing target interval is confirmed, and the perforation position is determined according to the obtained geological parameters of the reservoir. Parameters include reservoir rock mineral composition, porosity and permeability and other reservoir space characteristics and geological parameters such as gas-bearing property;

[0060] Step 2. Horizontal well installation

[0061] Determine the position of the target window according to the fracturing target interval confirmed in step 1, and then design the horizontal well traject...

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Abstract

The invention provides a multi-initiation-point multi-stage blasting fracturing method for a horizontal well of a shale gas reservoir. The method comprises the six steps of area screening, horizontal well installation, energy-gathered perforation, charging structure design, propellant and control device conveying and detonation completion. By conveying a hanging-type composite propellant to the same perforation hole channel of a target interval for multiple times, designing a delay control ignition device and controlling detonation on the ground, multi-initiation-point multi-stage blasting fracturing operation is completed; by increasing the multi-stage pulse charging amount and the utilization rate of fracturing explosive energy, high-energy gas is continuously generated, and the action time on the reservoir is prolonged; in addition, by designing the delay control ignition device, the composite explosive can be released in order, the performance is safe and reliable, and a casing pipe is not damaged; then, multi-initiation-point multi-stage blasting is conducted in the same perforation control hole channel, the number of fracturing cracks can be increased, artificial cracks with more complex shapes are formed, communication between the cracks is enhanced to form a near-wellbore complex crack net, and the fracturing transformation size of the shale reservoir is greatly increased.

Description

technical field [0001] The invention relates to the technical field of shale gas development and production stimulation, in particular to a multi-initiation point multi-stage explosion fracturing method for horizontal wells in shale gas reservoirs. Background technique [0002] At present, the mainstream technology of shale gas exploration and development is fracturing, among which hydraulic fracturing is the most commonly used, but hydraulic fracturing needs to consume a lot of water resources, the fracturing effect is greatly affected by the ground stress, and the fractures formed have a single shape and poor connectivity , and the additives in the fracturing fluid will cause reservoir damage and environmental pollution. As a new production stimulation technology developed in recent years, detonation fracturing has attracted the attention of major oil and gas companies. Oil and Gas Field. [0003] Explosion fracturing technology includes single-pulse and multi-stage pulse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/263E21B43/30E21B43/117E21B43/26
CPCE21B43/263E21B43/305E21B43/117E21B43/26
Inventor 陈尚斌张瑛堃王阳张宇航张少杰李学元王慧军
Owner CHINA UNIV OF MINING & TECH
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