Horizontal well oil-string casing well cementation method

A technology of horizontal well and casing, which is applied in the direction of wellbore/well components, earthwork drilling, sealing/isolation, etc. It can solve the problems of high cost and low quality of casing cementing in horizontal well oil layers

Active Publication Date: 2016-03-30
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a casing cementing method for the oil layer of a horizontal well to solve the problems of low quality and high cost of casing cementing for the oil layer of the horizontal well

Method used

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  • Horizontal well oil-string casing well cementation method
  • Horizontal well oil-string casing well cementation method
  • Horizontal well oil-string casing well cementation method

Examples

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Embodiment 1

[0057] Take a horizontal well in Honghe Oilfield of North China Branch Company as an example. The well is a two-dimensional horizontal well. The basic situation of the actual drilling is as follows: firstly, a Ф311.2mm drill bit was used to drill to 303m, and a Ф244.5mm surface casing was run to 302.91m , to carry out surface casing cementing; the second opening was drilled with a Ф215.9mm drill bit to 3149m, and the horizontal section was 911.80m long. It is planned to run an oil layer casing with an outer diameter of Ф139.7mm, steel grade N80, and a wall thickness of 7.72mm ( The schematic diagram of the actual drilling body structure is shown in figure 1 ).

[0058] In this embodiment, the casing cementing method of the horizontal well oil layer comprises the following steps:

[0059] (1) According to the reservoir Chang 8 formation pressure coefficient of this well is 0.96 (the formation pressure profile of the adjacent well is shown in figure 2 ), it is determined that...

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Abstract

The invention discloses a horizontal well oil-string casing well cementation method and belongs to the technical field of petroleum and natural gas well cementation. The horizontal well oil-string casing well cementation method comprises the steps that the drilling fluid density maintained when a casing descends is determined according to stratum pressure, centering devices are additionally arranged at a horizontal section, an inclined shaft section and a plumb shaft section, and drilling fluid is circulated in a sectioned mode; rheological parameters and critical displacement of cement paste are calculated according to different fluid types, spacer fluid and the cement paste are injected in sequence under the premise that it is ensured that the actual wellhead pressure does not exceed the upper limit value in the paste replacing process, and a well is shut down for cement setting after paste replacement is finished. The horizontal well oil-string casing well cementation method can solve the problem that oil-string casing well cementation quality is low for special well types such as a three-dimensional horizontal well and a stair-step horizontal well; in addition, operation is easy and convenient, field construction is easy, well cementation cost can be greatly lowered, and a powerful guarantee can be provided for subsequent reservoir reconstruction, oil production engineering construction and the like.

Description

technical field [0001] The invention relates to a casing cementing method for an oil layer of a horizontal well, belonging to the technical field of oil and gas well cementing. Background technique [0002] In horizontal well completion operations, in order to maintain long-term stable production of oil and gas wells and smooth implementation of subsequent production stimulation operations, casing cementing is generally used to complete wells. With the continuous improvement of drilling technology, more complex 3D horizontal wells emerge from well groups (or called "well factories"). However, both 2D and 3D Casing cementing technology in oil layers brings great challenges. It is mainly reflected in the difficulty of running the casing in the oil layer, low displacement efficiency, and difficult control of displacement displacement, etc. The result is that the cementing quality is often unsatisfactory. [0003] At present, the important reference material to guide the casin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 闫吉曾罗懿唐万举李雪彭明李林逢
Owner CHINA PETROLEUM & CHEM CORP
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