Deep water low temperature cementing cement system

A cementing and low-temperature technology, applied in drilling compositions, chemical instruments and methods, etc., to achieve the effects of rapid strength development, rapid development and easy performance adjustment

Inactive Publication Date: 2007-10-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a cement system with strong hydration ability and fast strength development at low temperature, so as to solve the shortcomings of the existing cement system for deep water well cementing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1, evaluation of low-temperature compressive strength performance of the deep-water low-temperature well cementing cement system of the present invention

[0016] Cement components: 42.27% tricalcium silicate, 15.10% calcium sulfoaluminate, 19.04% dicalcium silicate, 6.20% gypsum, 4.31% calcium carbonate, and the rest are tetracalcium aluminoferrite, calcium aluminate and other trace elements. Codenamed Sample L 1 .

[0017] Cement components: 32.10% tricalcium silicate, 20.73% calcium sulfoaluminate, 21.38% dicalcium silicate, 8.05% gypsum, 6.61% calcium carbonate, and the rest are tetracalcium aluminoferrite, calcium aluminate and other trace elements. Codenamed Sample L 2 .

[0018] Prepare the cement slurry according to the deep water cementing test standard API 10B-3-2004, and measure the density of the cement slurry and the compressive strength at different temperatures, and compare the compressive strength with the G-grade cement slurry system of conve...

Embodiment 2

[0020] Example 2, evaluation of the impact of coagulants on the compressive strength of the deep-water low-temperature cementing cement system of the present invention

[0021] The cement slurry was prepared according to the deep water cementing test standard API 10B-3-2004, the compressive strength of the cement slurry was measured under different temperature curing, and the compressive strength was compared with the G-grade cement slurry system of conventional density oil wells under the same conditions. The evaluation results are shown in Table 2. The experimental results showed that CaCl 2 , LiOH and Ca(AlO 2 ) 2 The coagulant has obvious coagulation-accelerating and early-strength effects on the deep-water low-temperature well cementing cement system of the present invention, and shows good compatibility.

[0022]

cement

system

CaCl 2

/ %

LiOH

/ %

Ca(AlO 2 ) 2

/ %

4°C compression resistance

Strength...

Embodiment 3

[0025] Example 3, evaluation of the effect of retarder on the thickening performance of the deep-water low-temperature cementing cement system of the present invention

[0026] Add 30% hollow microspheres, 1.3% coagulant, 0-1.0% retarder and water to the deep water low temperature cementing cement system of the present invention, and prepare cement slurry according to the deep water cementing test standard API 10B-3-2004 , resulting in a density of 1.37g / cm 3 The low-density cement slurry system, and the thickening time of the cement slurry, the transition time from 30Bc to 100Bc, the compressive strength and volume expansion rate of the cement stone were further measured according to the deep water cementing test standard API10B-3-2004. The evaluation results are shown in Table 3. Experimental results show that the thickening time of the deep-water low-temperature cementing cement slurry system of the present invention is extended with the increase of the retarder citric aci...

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Abstract

The invention belongs to sea deep water complex well cementing which is suitable for low temperature, tending to superficial water-gassed-out. The mineral components and mass percent composition are: 23-45 wt.% of tricalcium silicate, 12-25 wt.% of calcium sulphoaluminate, 15-23 wt.% of dicalcium silicate, 3-10 wt.% of gypsum, 4-8 wt.% of calcium carbonate, and residual celite, calcium aluminate and other microelement. The using process of the deep water complex well cementing includes: adding 0-3 wt.% of coagulant, 0-1.2 wt.% of retarder, 15-45 wt.% of hollow microglobin and water to prepare a low density cement slurry system of 1.35-1.60g/cm3 which has a controllable gelled time and has a perfect right-angle gelling capacity, a set cement volume microdilatancy and develops fast at low temperature. The inventive deep water low temperature complex well cementing has a high early strength, a short curing time, a powerful channeling-preventing ability, and microdilatancy, which provides a powerful guarantee to improve the deep water complex well quality.

Description

technical field [0001] The invention relates to a low-temperature cementing cement system used in the field of oil and gas well drilling. It is a marine deep-water cementing system that is especially suitable for low-temperature, shallow water-gas channeling, and can also be used in cold areas of onshore oil fields. The surface section and shallow section are cemented. Background technique [0002] Deep water refers to sea areas where the water depth exceeds 500m. In the past few years, deep-water oil and gas discoveries accounted for 40% of the total oil and gas discoveries in the world, especially in 2002-2003, it rose to 65%. So far, the proven oil reserves in deep waters are 9.0573 billion m 3 Oil equivalent, estimated to be 13.5065-15.89 billion m 3 The undiscovered reserves of oil equivalents have attracted many of today's oil companies to venture into deep waters. The role of deepwater cementing is not only to isolate the oil, gas and water layers in the wellbore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/46C09K8/56
Inventor 王成文王瑞和步玉环
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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