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A supercritical carbon dioxide completion fluid

A carbon dioxide and supercritical technology, applied in wellbore/well parts, bulk chemical production, chemical instruments and methods, etc., can solve the problem of affecting the curing process of cement slurry, reducing the density of cement slurry, reducing the cementation strength, etc. problems, to achieve good cementing effect, lower the freezing point, and improve the effect of longitudinal shear strength

Inactive Publication Date: 2017-02-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, residual drilling fluid will reduce the density of cement slurry, and its incompatibility will affect the curing process of cement slurry, thereby reducing the bonding strength
In order to make the mud cake and cement slurry have a better cementation quality, the completion fluid is used to pretreat the mud cake at the drilling site. At present, there are mainly three types of completion fluids used at home and abroad: surfactant completion fluid, solid Phase completion fluid and clay-free solid phase completion fluid are divided according to the composition ratio of the completion fluid. The above three completion fluids are all water-based completion fluids, which are highly effective in water-sensitive formations such as shale and shale formation Reduce, moreover, these three kinds of completion fluids need to add various chemical and physical components, and the cost is high

Method used

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  • A supercritical carbon dioxide completion fluid

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Embodiment

[0017] In this embodiment, the composition form of the supercritical carbon dioxide flushing fluid 6 is selected according to the formation characteristics of the wellbore 1 and the characteristics of the drilling fluid 5, the liquid carbon dioxide flushing fluid 6 is prepared on the ground, and the cement slurry 4 is prepared, according to the drilling fluid 5 and Compatibility of cementing cement slurry 4 and supercritical carbon dioxide flushing fluid 6, the pre-isolation fluid 3 and post-isolation fluid 7 are prepared; after drilling, it is pumped from casing 2 to the front in sequence through existing fluid equipment on the ground The isolation fluid 3, the supercritical carbon dioxide flushing fluid 6, the rear isolation fluid 7 and the cement slurry 4, as the depth increases and the temperature rises, the carbon dioxide in them becomes supercritical; the supercritical carbon dioxide enters the well wall 1 and casing The annulus between 2 flushes and cleans the mud cakes o...

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Abstract

The invention belongs to the technical field of oil and natural gas well completion, and relates to a supercritical carbon dioxide well completion fluid, which consists of a pre-spacer fluid, a supercritical carbon dioxide flushing fluid and a post-spacer fluid in a volume ratio of 2‑5:100:1‑5 Proportional mixing composition. When using, first prepare supercritical carbon dioxide flushing fluid and cement slurry on the ground, then prepare pre-isolating fluid and post-isolating fluid, and pump the pre-isolating fluid in sequence through the existing fluid equipment at the wellhead , supercritical carbon dioxide flushing fluid, rear spacer fluid and cementing cement slurry for flushing. After flushing, the cementing cement slurry is solidified and alkaline substances are injected from the annulus to remove carbon dioxide in the supercritical carbon dioxide flushing fluid and prevent carbon dioxide pollution Atmospheric and corrosive casing; its raw materials are easy to obtain, its principle is scientific, it is convenient to use, it has good cementing effect, low cost, effectively reduces the thickness of mud cake, and improves the cleanliness and roughness of mud cake.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of oil and natural gas drilling and completion, and relates to a completion fluid that improves cementing cementation strength, in particular a supercritical carbon dioxide completion fluid. [0003] Background technique: [0004] In the process of oil and natural gas exploitation, the quality of cementing is closely related to personal safety. If the cementing quality is poor, oil and gas resources will be lost from the wellhead. The mutual channeling of different pressure layers affects the rational development of oil and gas fields. After the channeling, formation fluids are easy to corrode the casing. In addition, the fluid flowing up will pollute the water source, easily explode, and endanger personal safety. The quality of cementing depends on the cementing strength of cement slurry and casing and borehole rock. Due to the infiltration and adhesion of drilling fluid, there is a layer of mud cake attac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/38C09K8/06E21B33/13
CPCC09K8/06C09K8/38E21B33/13Y02P20/54
Inventor 李木坤倪红坚王瑞和霍洪俊
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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