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Low-density cement slurry

A cement slurry, low-density technology, applied in the field of cement slurry, can solve the problems of easily broken float beads, unable to meet the pressure requirements of deep wells, etc., and achieve the effect of improving compressive strength

Active Publication Date: 2013-03-27
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects that the floating beads in the existing cement slurry are easily broken and cannot meet the pressure requirements of deep wells, and provide a low-density cement slurry with a stable density and as low as 1.29-1.31g / cm 3 , good overall performance, high strength and high temperature resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Mix 100g of G-grade cement, 15g of ultra-fine cement, 40g of micro-beads, and 8g of micro-silicon, then add 99g of water (water-solid ratio 61%) and stir evenly to make a slurry mixture, and then add a length of 5mm per liter of slurry mixture 0.15 g of polypropylene fiber to obtain cement slurry.

Embodiment 2-10

[0047] Embodiment 2-10 adopts substantially the same method as Embodiment 1, the difference lies in Table 2.

[0048] Table 2

[0049]

[0050] Performance Testing

[0051] The measuring devices and measuring methods used in the product analysis in the following examples all refer to GB / T19139-2003 Oil Well Cement Test Method.

[0052] Shown in Table 3 is the rheological performance table of the cement slurry obtained in Examples 1-10.

[0053] table 3

[0054]

[0055] The above shear stress readings are read with the rotation speed per minute, which are the shear stresses at 600 rpm, 300 rpm, 200 rpm, 100 rpm, 6 rpm, and 3 rpm. stress.

[0056] The n value in the above table refers to the fluidity index, which refers to the index of the shear rate of the fluid in the rheological mode, and reflects the rheology of the cement slurry. The n values ​​of the cement slurries obtained in Examples 1-10 are all above 0.8, indicating that the cement slurries obtained in Exa...

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Abstract

The invention provides a low-density cement slurry. The water-solid ratio of the cement slurry is (58-65):100, and the cement slurry comprises the following solid components in parts by weight: 112-118 parts of cement, 35-45 parts of lightening admixture microbeads and 5-12 parts of stabilizer micro-silicon, wherein the cement comprises 100 parts of cement first component with the average particle size of 12-14 mu m and 12-18 parts of cement second component with the average particle size of 6-7 mu m; calculated by the volume of the cement slurry, each liter of the cement slurry comprises 0.1-0.25g of fiber; and the density of the cement slurry is 1.29-1.31g / cm<3>. By applying a cement slurry system disclosed by the invention, cementing quality of a formation, which is easy to drop out due to the development of cracks of limestone and dolostone can be greatly improved.

Description

technical field [0001] The invention relates to the field of petroleum drilling engineering, in particular to a cement slurry suitable for sealing formations with high well temperature and easy leakage. Background technique [0002] In oil drilling engineering, with the deepening of exploration and development, the drilling depth is deepened, and the strata that need to be sealed are more complicated. For example, in the Tarim Basin, fractures and caves are well developed in the deep limestone and dolomite formations, the formation pore pressure is low, and leakage is prone to occur during drilling and cementing. The reservoir protection requirements of dolomite fracture-cavity intervals are high, and plugging is difficult, so it is difficult to carry out Effective plugging cannot meet the conditions of conventional cementing construction. In addition, the casing runs deep, the bottom hole temperature is high, and the strength of cement is prone to decay. [0003] Most of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/473C09K8/467
Inventor 杨兰田贾晓斌刘云周伟董秀民王永洪罗发强张平马新中李双贵刘晓民路飞飞樊艳芳于洋彭明旺
Owner CHINA PETROLEUM & CHEM CORP
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