Low-temperature early-strength salt-resistant well cement slurry system

A technology for cementing cement slurry, early strength and salt resistance, applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of high on-site construction risk, casing corrosion, high difficulty coefficient, etc., and achieve on-site construction conditions. It is not harsh, has good low temperature resistance, and ensures the effect of construction safety.

Inactive Publication Date: 2016-08-31
四川凯尔油气田技术服务有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of latex as a fluid loss reducing agent is that it is added in a large amount, and the API water loss is too large, and it is easy to hang in the cement tanker and it is difficult to clean, resulting in higher maintenance equipment costs.
Although calcium chloride is used as composite early-strength agent, the early strength can be improved, but the chloride ion

Method used

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  • Low-temperature early-strength salt-resistant well cement slurry system
  • Low-temperature early-strength salt-resistant well cement slurry system
  • Low-temperature early-strength salt-resistant well cement slurry system

Examples

Experimental program
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Effect test

Embodiment 1

[0076] Example 1: 100 parts of G-grade oil well cement, 1 part of low-temperature anti-salt fluid loss reducing agent, 3 parts of composite early strength agent, 13.5 parts of hollow glass microspheres, 0.2 parts of dispersant, 4 parts of micro silicon, and 81 parts of brine.

Embodiment 2

[0077] Example 2: 100 parts of G-grade oil well cement, 0.95 parts of low-temperature salt-resistant fluid loss reducing agent, 2.8 parts of composite early strength agent, 6 parts of hollow glass microspheres, 0.3 parts of dispersant, 3.8 parts of micro-silicon, and 67 parts of brine.

Embodiment 3

[0078] Example 3: 100 parts of G-grade oil well cement, 0.9 parts of low-temperature anti-salt fluid loss reducing agent, 2.5 parts of composite early strength agent, 3 parts of hollow glass microspheres, 0.4 parts of dispersant, 3.6 parts of micro-silicon, and 58 parts of brine.

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Abstract

The invention discloses a low-temperature early-strength salt-resistant well cement slurry system comprising 100 parts of class-G oil well cement, 0.8-1 part of low-temperature salt-resistant fluid loss agent, 2-3 parts of compound early strength agent, 0-13.5 parts of hollow glass micro-beads, 0.2-0.5 part of dispersant, 3-4 parts of micro-silicon and 41-81 parts of salt water. The low-temperature early-strength salt-resistant well cement slurry system can realize well cementing in the density range from 1.50g/cm<3> to 1.90g/cm<3>, is good in low temperature resistance, strong in salt resistance, safe and convenient for on-site construction, good in well cementing quality, and provides a reliable and safe guarantee for well drilling and oil production.

Description

technical field [0001] The invention relates to a cement slurry system for well drilling and cementing in oil and gas fields, in particular to a low-temperature early-strength salt-resistant cement slurry system. Background technique [0002] In the surface casing cementing process of oil and gas fields, due to the low formation temperature and easy to see salt layer, the strength of cement stone develops slowly and the curing time is long, which leads to the increase of drilling cost and high risk of on-site construction. [0003] At present, latex is commonly used as fluid loss reducer and calcium chloride as composite early strength agent in low temperature salt-resistant cementing slurry system in oil fields. The disadvantage of latex as a fluid loss reducing agent is that it is added in a large amount, and the API water loss is too large, and it is easy to hang in the cement tanker and is difficult to clean, resulting in higher maintenance equipment costs. Although cal...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B24/12C04B24/16C09K8/487C04B103/12C04B103/46
CPCC04B28/00C04B40/0039C04B2103/12C04B2103/46C04B2111/00724C04B2201/20C04B2201/50C09K8/487C04B14/24C04B2103/408C04B22/124C04B18/146C04B24/04C04B24/122C04B24/02C04B22/085C04B24/16C04B22/10C04B22/14C04B24/045
Inventor 邓天东
Owner 四川凯尔油气田技术服务有限公司
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