System and method for improving integrity of cased wellbores

A cased well and integrity technology, applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve limited and casing damage problems, reduce damage, reduce magnitude and risk, and reduce integrity The effect of the risk

Active Publication Date: 2020-05-15
王瀚艺 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that once the fault slips, the strong shear force that the casing can resist and the energy that the buffer device can absorb the slippage of the fault are very limited. Therefore, from the perspective of casing materials or downhole devices to prevent and slow down faults The problem of casing damage caused by slippage is very limited
Therefore, it can be considered that there is currently no effective method to prevent or reduce casing deformation caused by fault slippage

Method used

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  • System and method for improving integrity of cased wellbores
  • System and method for improving integrity of cased wellbores
  • System and method for improving integrity of cased wellbores

Examples

Experimental program
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Effect test

Embodiment 1

[0112] In one of the embodiments disclosed by the present invention, figure 1 A schematic diagram of a system 10 for producing fluids from or injecting fluids into a formation is depicted. System 10 may include formation 20 , wells 30 , 40 , 50 and fluid production or injection facility 60 . Depending on ground conditions, geological conditions and economic prospects, vertical wells 30, deviated wells 40 or horizontal wells 50 may be drilled. The deviated well 40 is initially drilled vertically downward and then deviated towards the formation 20 . The horizontal well 50 is drilled using a rotary steerable method, and the resulting deviated wellbore trajectory can be maintained within the formation 20 . The borehole may intersect one or more weak surfaces 70, 80, 90 that induce fault slip due to production or injection operations disturbing the stress field.

Embodiment 2

[0114] In one of the embodiments disclosed by the present invention, figure 2 Schematic depicting fault reactivation due to hydraulic pressure work in a multi-well platform. As shown, multiple horizontal wells 100, 110, and 120 are drilled from a single drilling rig. During hydraulic fracturing, fluid is injected into the horizontal well 110 to initiate and propagate one or more hydraulic fractures 130 within the rock formation containing the wellbore. Furthermore, hydraulic fractures 130 may be planar, or may interact with natural fractures to form complex fracture networks within reservoir stimulated volume 140, depending on in situ stresses and geological conditions. Pre-existing faults 150 and 160 may directly interact with hydraulic fractures 130 or contact reservoir stimulated volume 140 to induce stress or pore pressure changes to initiate reactivation. Slippage of fault 150 may cause damage to casing deployed and consolidated within horizontal well 100 . Likewise, ...

Embodiment 3

[0116] In one of the embodiments disclosed by the present invention, image 3 A schematic cross-sectional view of a cased wellbore 210 intersecting a fault 220 is depicted. When a well is drilled, the portion of the wellbore where no casing has been placed and consolidated is called the "open hole". The casing 200 is a special steel pipe for oil and gas wells. After drilling to the target depth, it is lowered into the open wellbore, and then the casing 200 is consolidated in place with the cement sheath 190 . Consolidating casing in oil and gas wells is critical to maintaining wellbore stability, preventing contamination of drinking water zones, isolating different formations, and working downhole. Cased wellbore 210 may intersect one or more weak surfaces, such as fault 220 .

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Abstract

The invention belongs to the field of downhole operation, and particularly relates to a method and system for improving the integrity of cased wellbores. A system and method for improving integrity ofa cased wellbore are provided. The method comprises: 1) identifying at least one weak plane corresponding to a highest probability of slip of fault within the open-hole wellbore; 2) providing pressurized fluid into the open-hole wellbore to cause the slip of the fault by inducing tensile or shear failures within the open-hole wellbore along the at least one weak plane; 3) restoring a shape of theopen-hole wellbore after the slip of the fault by removing material from an inner surface of the open-hole wellbore, to provide a uniform or smooth cross-section along an elongate axis of the open-hole wellbore; 4) arranging and cementing a casing along the restored open-hole wellbore to obtain the cased wellbore having improved integrity. The method and system disclosed herein may prevent or mitigate cased wellbore damage caused by fault slip.

Description

[0001] priority application [0002] This application requires (i) US Patent Application US 62792834 "Methods for Mitigation Fault Reactivation Induced Casing Damage" filed on January 15, 2019, and (ii) US Patent Application US 16693224 "System and Method" filed on November 23, 2019 for Improving Integrity of Cased Wellbores", both priority U.S. patent applications are incorporated by reference in their entirety. technical field [0003] The invention belongs to the field of downhole operations and relates to hydraulic fracturing, in particular to a method and a system for improving the integrity of casing well bores. Background technique [0004] Hydraulic fracturing is a standard practice for modifying oil and gas reservoirs to increase oil and gas production. During a hydraulic fracturing treatment, fluid is injected into the wellbore under pressure to overcome the fracture strength of the rock. As a result, one or more hydraulic fractures initiate in the wellbore and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B43/26
CPCE21B33/13E21B43/26
Inventor 王瀚艺赵沛东
Owner 王瀚艺
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