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Shale gas horizontal well fracturing vertical transformation volume control method

A technology of modifying volume and control method, which is applied in the fields of production fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as the inability to achieve maximum coverage, and achieve the effect of limited solution effect.

Pending Publication Date: 2021-01-12
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is impossible to achieve the maximum coverage of the volumetric fracturing vertical stimulation volume of shale gas horizontal wells in high-quality shale reservoirs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A shale gas horizontal well fracturing vertical stimulation volume control method, comprising the following steps:

[0029] a. Analyze the wellbore trajectory of shale gas horizontal wells, and make a comprehensive judgment on whether the wellbore trajectory is in the target layer by using the horizontal well drilling gas logging display, logging interpretation and drilling completion geological model;

[0030] b. Determine the relative position of the wellbore trajectory and the target interval according to the drilling geological model. If the wellbore trajectory is above the target interval, use the directional downward perforation method; if the wellbore trajectory is below the target interval, use the directional upward perforation method. Perforation method;

[0031] c. Reduce the fracture pressure, control the net pressure of fractures, use acid liquid to reduce the initial fracture pressure of shale reservoirs, control the discharge of acid liquid when it enters...

Embodiment 2

[0034] A shale gas horizontal well fracturing vertical stimulation volume control method, comprising the following steps:

[0035] a. Analyze the wellbore trajectory of shale gas horizontal wells, and make a comprehensive judgment on whether the wellbore trajectory is in the target layer by using the horizontal well drilling gas logging display, logging interpretation and drilling completion geological model;

[0036] b. Determine the relative position of the wellbore trajectory and the target interval according to the drilling geological model. If the wellbore trajectory is above the target interval, use the directional downward perforation method; if the wellbore trajectory is below the target interval, use the directional upward perforation method. Perforation method;

[0037] c. Reduce the fracture pressure, control the net pressure of fractures, use acid liquid to reduce the initial fracture pressure of shale reservoirs, control the discharge of acid liquid when it enters...

Embodiment 3

[0041] A shale gas horizontal well fracturing vertical stimulation volume control method, comprising the following steps:

[0042]a. Analyze the wellbore trajectory of shale gas horizontal wells, and make a comprehensive judgment on whether the wellbore trajectory is in the target layer by using the horizontal well drilling gas logging display, logging interpretation and drilling completion geological model;

[0043] b. Determine the relative position of the wellbore trajectory and the target interval according to the drilling geological model. If the wellbore trajectory is above the target interval, use the directional downward perforation method; if the wellbore trajectory is below the target interval, use the directional upward perforation method. Perforation method;

[0044] c. Reduce the fracture pressure, control the net pressure of fractures, use acid liquid to reduce the initial fracture pressure of shale reservoirs, control the discharge of acid liquid when it enters ...

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Abstract

The invention discloses a shale gas horizontal well fracturing vertical transformation volume control method, and belongs to the technical field of oil and gas field development. The shale gas horizontal well fracturing vertical transformation volume control method is characterized by comprising the following steps that a, a shale gas horizontal well borehole trajectory is analyzed, and whether the borehole trajectory is in a target layer or not is comprehensively judged by utilizing horizontal well drilling gas logging display, logging interpretation and a finished drilling geological model;b, the relative position of the borehole trajectory and a target layer section is judged according to the finished drilling geological model; and c, the fracture pressure is reduced, the fracture netpressure is controlled, the initial fracture pressure of a shale reservoir is reduced by utilizing acid liquor, the displacement of the acid liquor entering a stratum is controlled, the contact time of the acid liquor and a near wellbore area is prolonged, near wellbore pollution is relieved, and a rock skeleton structure is destroyed. According to the shale gas horizontal well fracturing verticaltransformation volume control method, by controlling the hydraulic fracture initiation direction and the fracture initiation pressure, maximum coverage of the shale gas horizontal well volume fracturing vertical transformation volume in the high-quality shale reservoir can be achieved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for controlling the vertical stimulation volume of shale gas horizontal well fracturing. Background technique [0002] At present, the fracturing stimulation of shale reservoirs is mainly aimed at forming an effective stimulation volume. The stimulation effect is determined by the stimulation area formed after fracturing, the coverage rate of high-quality reservoirs, and the complexity of fractures in the stimulation box. The volume of fracturing stimulation not only needs to expand and cover the reservoir as much as possible in the horizontal direction, but more importantly, make the fracturing stimulation area coincide with the best quality reservoir as much as possible in the vertical direction. [0003] However, due to the thin thickness of high-quality shale gas reservoirs in my country and the frequent complications in the drilling process of ...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/267E21B49/00
CPCE21B43/26E21B43/267E21B49/00
Inventor 朱炬辉李军龙杨海耿周梅陈明忠郭凌峣何昀宾蒋佩
Owner BC P INC CHINA NAT PETROLEUM CORP
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