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Cement capable of resisting CO2 corrosion for well cementation

A cement and cementing technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of reducing the permeability of Portland cement stone, and achieve the effect of good CO2 corrosion resistance

Inactive Publication Date: 2013-06-12
TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

for CO 2 For the corrosion of the cement sheath, literatures mostly use external admixtures to reduce the alkalinity of Portland cement or add materials such as latex to reduce the permeability of Portland cement, or a combination of the two, but these technologies can only play a role. Delay CO 2 The effect on the corrosion of cement stone cannot fundamentally eliminate this effect

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  • Cement capable of resisting CO2 corrosion for well cementation
  • Cement capable of resisting CO2 corrosion for well cementation

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with specific embodiment:

[0010] The CO resistance used in the following tests 2 Corroded well cement, its composition and ratio are shown in Table 1 below. The aluminate cement in the table is produced by Zhengzhou Aldu Refractories Co., Ltd., and the product name is A900; the sulfoaluminate cement is produced by Zhengzhou Wanglou Cement Industry Co., Ltd., and the product name is ZWSA; the phosphate material is produced by Tianjin Kemiou Provided by Chemical Reagent Co., Ltd.; fly ash is provided by Tianjin Sanyuan Fly Ash Co., Ltd., with a particle size of 325 mesh; diatomite is provided by Jilin Changbai Diatomite Co., Ltd., with a particle size of 325 mesh; API G cement High sulfur resistance (HSR) G-grade cement produced for Sichuan Jiahua Enterprise (Group) Co., Ltd.

[0011] Table 1 CO tolerance 2 Cement formulations for corrosion cementing and control test formulations

[0012]

[001...

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Abstract

The invention discloses cement capable of resisting CO2 corrosion for well cementation, which solves the problem that a cement ring, made of existing silicate oil-well cement in the oil field, is easily corroded by CO2. The constituents of the cement are as follows: 1 part of aluminate cement or sulphate aluminium cement, 0.1-0.5 parts of phosphate and 0-2 parts of packing material by weight. Theability of resisting CO2 corrosion of the cement disclosed by the invention, is obviously higher than that of corresponding G-level cement of API (American Petroleum Institute) under the same CO2 corrosion condition.

Description

technical field [0001] The invention relates to a cement for oil and gas well cementing, in particular to a cement that can withstand CO 2 Corrosion of special cement. Background technique [0002] Portland oil well cement is usually injected during cementing construction, and the cement slurry hardens to form a cement sheath after returning to the design height. The main function of the cement sheath is to support and hang the casing, protect the well wall, seal the formation fluid, prevent interlayer channeling, and prevent casing corrosion. Therefore, the hardened cement sheath is required to have high compressive strength, low permeability and good durability. CO 2 As an associated gas of oil and natural gas or a component of formation water, it exists in oil and gas layers or formation water. Under suitable humidity (relative humidity greater than 50%) and pressure environment conditions, it will corrode the oil well cement and reduce the strength of the cement sheat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/46
Inventor 曾建国孙富全刘爱萍李鹏晓谭文礼高永会吕光明侯薇
Owner TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC