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Enhanced method for fast and uniform sagd startup

A rate and pressure technology used in the field of starting the production of SAGD wells with steam assisted gravity drainage.

Active Publication Date: 2017-10-03
BITCAN GEOSCIENCES & ENG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these typically require a sacrificial well, which increases the cost of drilling and completing the SAGD well pair
Again, sacrificial fractures formed in the process would complicate steam consistency and thus make interwell communication between SAGD well pairs difficult

Method used

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  • Enhanced method for fast and uniform sagd startup
  • Enhanced method for fast and uniform sagd startup
  • Enhanced method for fast and uniform sagd startup

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Embodiment Construction

[0024] The present invention provides a method of managing failure modes in subterranean formations to induce the formation of one or more expansion zones, manages the steering of expansion zones connecting SAGD well pairs, and further employs complex downhole packer systems. systems) manage the lateral uniform extension of the expansion zone along the length of the SAGD well without segmenting the length of the well. It further provides a transition path from expansion to normal SAGD production.

[0025] The present invention serves to modify the original stress field surrounding the SAGD well so that expansion zones, rather than fracture zones, are formed to connect the SAGD wells. The present invention also promotes uniform expansion along the length of the SAGD well, despite local inhomogeneities that may exist along the length of the well.

[0026] For the purposes of the present invention, expansion is defined as an increase in porosity under overall compressive stress ...

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Abstract

The present invention provides a method for creating a laterally continuous, vertically oriented expansion zone connecting two SAGD wells. The method comprises the steps of: drilling and completing the SAGD well in the formation; conditioning the well to create stress conditions that are subsequently favorable for the formation of the expansion zone; applying pressure to the two sides at a pressure greater than the in situ minimum stress of the formation. Inject stimulant in one or both of the two wells to begin connecting the expanded region of the SAGD well, and continuously inject stimulant in the first of the two wells while maintaining the target in the second of the two wells pressure to spread the expansion zone evenly along the length of the well.

Description

technical field [0001] The present invention relates to a method for stimulating subterranean formations by geomechanical expansion to initiate production of a steam-assisted gravity drain (SAGD) well. Background technique [0002] The extraction of petrochemicals from subsurface rock formations is an important global industry. However, in North America and many parts of the world, petrochemicals are found in heavy, viscous forms, such as bitumen, which are very difficult to extract. Bitumen-saturated oil sands reservoirs in Canada, Venezuela, California, China and elsewhere around the world are just some examples of such subsurface formations. In these rock formations, it is impossible to simply drill wells and extract oil. Instead, the reservoir can be heated or otherwise stimulated to reduce viscosity and facilitate extraction. [0003] The two most common commercially viable methods of stimulating oil sands reservoirs are (a) cyclic steam stimulation (CSS) and (b) ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/22
Inventor 袁彦光
Owner BITCAN GEOSCIENCES & ENG INC