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Fracture-cavity type carbonate reservoir storage type discriminating method

A technology of carbonate reservoirs and discrimination methods, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., which can solve the problem of inability to effectively and comprehensively reflect the type of reservoir space, and inability to effectively guide exploration and development methods and methods, etc. Problems, to achieve good application effect and promote the effect of value

Active Publication Date: 2015-05-20
江杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then, as we all know, the logging method can only measure the short-distance space around the wellbore. It cannot effectively and comprehensively reflect the real type of storage space for liquid supply, nor can it effectively guide its exploration and development methods and methods.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: During the drilling and logging process of Zhonggu 15 Well in Tazhong I Condensate Gas Field, there were no abnormal phenomena such as drilling fluid loss, faster drilling, significantly reduced cuttings return, or emptying of drilling tools, indicating that the well did not directly Fracture-cavity (cavity) reservoirs were encountered, but the pressure curve of acid fracturing after completion of well completion and pump shutdown showed an obvious horizontal straight line, and the bottomhole pressure (68.4MPa) was close to the formation pressure (67.9MPa) after pump shutdown; production characteristics The fitted cumulative production-cumulative pressure drop curve is linear. Therefore, it can be judged that the acid fracturing of this well communicates with the fractured-vuggy (cavity) reservoirs far from the wellbore.

Embodiment 2

[0036] Example 2: During the drilling and logging process of Zhonggu 16 Well in Tazhong I Condensate Gas Field, there were no abnormal phenomena such as drilling fluid loss, faster drilling, significantly reduced cuttings return, or emptying of drilling tools, and the well was completed. The acid fracturing (acidizing) stimulation pressure curve decreased slowly when the pump was stopped, and the bottomhole pressure dropped from 103MPa to 92MPa. The seepage characteristics were obvious. The production-cumulative pressure drop curve is in a curved state, which can be judged that the well mainly encountered fractured-vuggy reservoirs.

Embodiment 3

[0037] Example 3: During the drilling and logging process of Zhonggu 261H Well in Tazhong I Condensate Gas Field, there were no abnormal phenomena such as drilling fluid loss, faster drilling, significantly reduced cuttings return, or emptying of drilling tools. (Acidification) The pump shutdown pressure curve is horizontal and straight, and the bottom hole pressure after the pump shutdown is 110MPa, which is much higher than the formation pressure of 67.88MPa. It can be judged that the main reservoir type encountered in this well is a vug reservoir.

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Abstract

The invention provides a fracture-cavity type carbonate reservoir storage type discriminating method. The fracture-cavity type carbonate reservoir storage type discriminating method comprises the first step that preliminary determination on the storage body type encountered by a shaft is conducted firstly according to whether abnormality happens in a log well drilling process and logging information; the second step that a main feed flow storage body type is further determined by using acid fracturing modification information, well testing information and production performance information; the third step that a main development well type and development modes are put forward according to district storage body type recognition. By using a first condensate gas field in Tazhong area, the fracture-cavity type carbonate reservoir storage type discriminating method achieves a good effect. The fracture-cavity type carbonate reservoir storage type discriminating method can effectively and fully determine and recognize the main feed flow storage body types of a producing well, the main storage body types of the district is summarized and studied, and relative development well types and development modes can be made, different development technological policies are made for the production wells with the different storage body types. The fracture-cavity type carbonate reservoir storage type discriminating method is worthy of popularization in the same industry in a wide range.

Description

technical field [0001] The invention relates to the technical field of exploration and development of fracture-cavity carbonate reservoirs, in particular to a method for distinguishing reservoir types of fracture-cavity carbonate reservoirs. Background technique [0002] The reservoir space types of fracture-cavity carbonate reservoirs are mainly large fractures and caves, fractures and pores formed by dissolution. It has strong heterogeneity and poor connectivity. Different types of reservoirs directly determine the different exploration and development methods. For example, large fractures and large caves are suitable for vertical well development, and water injection should be used to improve oil and gas recovery in the later stage; while Fracture-vuggy or pore-vug reservoirs are suitable for development by horizontal wells, and water injection is not suitable for enhancing recovery in the later stage. At present, the carbonate reservoir type is mainly judged by the resu...

Claims

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 邓兴梁李世银江杰乔书校
Owner 江杰
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