High-temperature special oil well cement material and preparation method thereof

A kind of oil well cement, special technology, applied in the direction of chemical instruments and methods, drilling composition, etc., can solve the problems of unavailable basic raw materials, high import price, low strength performance, etc., to achieve thickening performance and slurry stability Good sex, prolonged hydration age, and increased strength

Active Publication Date: 2010-12-08
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these fine oil well cements (including the micro oil well cement products of Hallibuton Services Company of the United States used in the comparative experiment of this application) are all kept secret, and the import price is relatively high, and the

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  • High-temperature special oil well cement material and preparation method thereof
  • High-temperature special oil well cement material and preparation method thereof
  • High-temperature special oil well cement material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, the preparation of high temperature special oil well cement material

[0024] The high-temperature special oil well cement material of the invention is mainly used in oil and gas well workover projects with a bottom hole temperature of 60°C-130°C.

[0025] (1). Selection of raw materials

[0026] The high-temperature special oil well cement material has a wide applicable temperature range, with the highest operating temperature as high as 130°C and the lowest operating temperature as 60°C. Therefore, the present invention proposes that the raw materials for preparing this type of cement material should have better temperature stability.

[0027] There are three Portland cements specified in the national standard for the preparation of high-temperature special oil well cement materials, which are medium resistance G grade oil well cement, high resistance D grade oil well cement and high belite cement (code B). The chemical composition and mineral compositi...

Embodiment 2

[0073] Embodiment 2, preparation of high temperature special oil well cement material

[0074] 1. Preparation process

[0075] Choose high belite cement, SiO 2 Quartz sand with a content ≥ 98% and additives S-2 and S-3 are used as raw materials for high-temperature special oil well cement materials. First, grind the high belite cement and quartz sand in a jet mill to a fine powder with a particle size ≤ 15 μm, then add the calculated amount of admixture S-2 or S-3, and then follow the method determined in Example 1 The ratio is poured into a DXH-cantilever double-helix cone mixer and mixed for 10-20 minutes to obtain a high-temperature special oil well cement material; put it into a packaging bag, and the net weight of each bag is 40kg±1kg.

[0076] 2. Determination of mixing time

[0077] Prepare 500kg of high-temperature special oil well cement materials according to the ratio and mix them in the mixer for 10min, 15min and 20min respectively. Take an equal amount of samp...

Embodiment 3

[0101] Embodiment 3, the performance of high temperature special oil well cement material

[0102] 1. Compressive strength of high-temperature special oil well cement materials at different ages

[0103] In order to further study the strength development of high-temperature special oil well cement materials under the condition of prolonged curing time, four conditions of 60°C, 90°C normal pressure and 100°C, 130°C 20.7MPa were selected for 24h, 48h and 72h, and the test compression Variations in intensity.

[0104] The results are shown in Table 17. Under the four temperature conditions, the compressive strength of the cement increases steadily with the extension of the curing time, and no shrinkage occurs. Therefore, it makes up for the decrease in cement strength due to the addition of admixtures.

[0105] Table 17 Compressive strength results of high temperature special oil well cement materials at different ages (w / c=1.5)

[0106]

[0107] 2. Performance of high-temper...

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Abstract

The invention discloses a high-temperature special oil well cement material and a preparation method thereof. The cement is a product obtained by doping quartz sand powder and admixture to high belite cement and evenly mixing the substances. The cement product of the invention has the following advantages that: (1) the high-temperature special oil well cement which is prepared by compounding highbelite cement with suitable quartz sand and admixture has favorable thermal stability; (2) hydration products of the high-temperature special oil well cement vary with temperature, i.e. Aft and calcium hydroxide occur at 60 DEG C to 80 DEG C; Aft disappears and xonotlite occurs at 90 DEG C; all the hydration products are converted into xonotlite at 110 DEG C; (3) all the performances of the high-temperature special oil well cement in a water-cement ratio of 1.2 to 1.8 basically satisfy the requirements of technical indexes; and (4) the high-temperature special oil well cement has stably enhanced strength along with the prolongation of a hydration age without causing a retraction phenomenon. The cement product of the invention has the advantages of high thermal stability, low pollution, and the like, the preparation method has the advantages of low requirement for instruments and equipment, low cost, and the like and is suitable for large-area popularization and application.

Description

technical field [0001] The invention relates to cement products in the field of chemical industry, in particular to a micro-fine oil well cement (named high-temperature special oil well cement in the invention) with a wide applicable temperature (60°C-130°C) and a preparation method thereof. Background technique [0002] Fine oil well cement refers to oil well cement with a maximum particle size of 10-15 μm and an average particle size of 2-4 μm. It is characterized by small cement particle size and high specific surface area, generally in the range of 800-1600m 2 / Kg. The application of fine oil well cement is due to the further development of oilfields in recent decades, which has increased the production degree of geological reserves. In order to delay the decline of crude oil production, multiple infill adjustments were used in development, and water injection replenished formation energy to stabilize production. Due to the long-term adjustment and development, the fo...

Claims

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Application Information

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IPC IPC(8): C09K8/467C04B28/00C04B24/18
Inventor 隋同波李娟吴晓蓉王晶周春英
Owner CHINA BUILDING MATERIALS ACAD
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