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A cementing method and device for weakly cemented formations

A weakly cemented, stratum technology, used in earth-moving drilling, wellbore/well components, sealing/packing, etc., to avoid accidents

Active Publication Date: 2018-11-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a cementing method and device for weakly cemented formations, aiming to solve the problem of cementing quality in weakly cemented formations, and further improve the cementing quality and cementing strength of weakly cemented formations

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  • A cementing method and device for weakly cemented formations
  • A cementing method and device for weakly cemented formations
  • A cementing method and device for weakly cemented formations

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Embodiment Construction

[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0062] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects and not necessarily Describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of practice in sequences other than...

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Abstract

The invention provides a well cementation method and device for a weakly consolidated formation. The method comprises the steps that a geological sample of the weakly consolidated formation is acquired; the moisture content, the density, the sand grain size and the void ratio of the weakly consolidated formation are determined according to the geological sample; the grain size of a consolidation material and well cementation construction parameters are determined according to the void ratio and the sand grain size; well cementation is conducted on the weakly consolidated formation according to the grain size of the consolidation material and the well cementation construction parameters. According to the method, a well cementation process technology is combined with a grouting consolidation technology, the preferred consolidation material is added into prepad fluid, the prepad fluid added with the consolidation material penetrates into the weakly consolidation formation through a certain pressure difference to enable a structure system with the certain strength to be formed in the portion, near a shaft, of the weakly consolidated formation, then cementing consolidation is conducted on the shaft, a layer of shell of which the strength is gradually varied is formed around a cement sheath to achieve a support effect on the cement sheath, and therefore the well cementation quality problem of the weakly consolidated formation is fundamentally solved.

Description

technical field [0001] The invention relates to the technical field of oil drilling, in particular to a well cementing method and device for weakly cemented formations. Background technique [0002] As my country's demand for oil and gas resources continues to increase and oil and gas production in the eastern part of the land declines, oil, gas and hydrate resources in the western and deep water areas will become important areas for the sustainable development of my country's petroleum industry. Weakly cemented strata are widely distributed in my country's deep-water shallow strata and in the western Jurassic and Cretaceous strata. The special diagenetic environment and depositional process have formed its unique geological conditions and mechanical properties. [0003] First of all, for deep-water weakly cemented formations, the formation compaction time is short and the permeability is high, so the high-pressure shallow water will have a certain mobility in the formation,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 步玉环杜嘉培郭胜来柳华杰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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