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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  • 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 comprehensiv

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Example 1: Well Zhonggu 15 in the Tazhong No. 1 condensate gas field has no abnormal phenomena such as drilling fluid loss during drilling and logging, acceleration of drilling time, significant reduction of cuttings return, or drilling tool venting, indicating that the well has no direct A fractured-cavity (cavity) type reservoir was encountered, but the pump-stopping pressure curve of the completion acid fracturing transformation was obviously horizontal and straight, and the bottom hole pressure (68.4MPa) was close to the formation pressure (67.9MPa) after the pump was stopped; production characteristics The fitted cumulative production-accumulated pressure drop curve is linear, therefore, it can be judged that the acid pressure of the well communicates with the fracture-cavity (cavity) reservoir of the far wellbore.

Example Embodiment

[0036] Example 2: Well Zhonggu 16 in the Tazhong No. 1 condensate gas field did not experience any abnormal phenomena such as loss of drilling fluid, accelerated drilling time, significant reduction in cuttings return, or venting of drilling tools during drilling and logging. The well was completed. The pump-stopping pressure curve of acid fracturing (acidification) transformation slowly drops, the bottom hole pressure drops from 103 MPa to 92 MPa, and the seepage characteristics are obvious. After the pump is stopped, the bottom hole pressure is higher than the formation pressure 67.88 MPa. The well has not been tested, and the production characteristics are exhausted. The production-accumulated pressure drop curve is in a curvilinear state, and it can be judged that the well is mainly drilled into fractured-vug reservoirs.

Example Embodiment

[0037] Example 3: Well Zhonggu 261H in the Tazhong No. 1 condensate gas field did not experience any abnormal phenomena such as loss of drilling fluid, accelerated drilling time, significant reduction of cuttings return, or venting of drilling tools during drilling and logging. (Acidification) The pump-stopping pressure curve is horizontal and straight, and the bottom hole pressure after pumping-stopping 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 porous 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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