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A New Type of High Temperature and Low Density Cement Slurry System

A cement slurry and low-density technology, applied in the field of high-temperature and low-density cementing operations and high-temperature and low-density cement slurry systems, can solve problems such as lack of new technology research, achieve good economic benefits and environmental protection effects, avoid side effects, and improve compression resistance. the effect of strength

Inactive Publication Date: 2017-06-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although research on low-density cement slurry systems for high-temperature deep wells and ultra-deep wells has been carried out in China, research on new technologies, new materials and new systems is quite lacking.

Method used

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  • A New Type of High Temperature and Low Density Cement Slurry System
  • A New Type of High Temperature and Low Density Cement Slurry System
  • A New Type of High Temperature and Low Density Cement Slurry System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: Composition of high temperature and low density cement slurry system

[0041] A high-temperature low-density cement slurry system can be composed of the following substances, and the mass parts of each substance are specifically: 100 parts of oil well cement, 80 parts of fly ash, 30 parts of silica sand, 53 parts of active enhancer I, 22 parts of active enhancer II, high temperature 12 parts of fluid loss reducer, 0.3 parts of retarder, and 180 parts of water.

Embodiment 2

[0042] Embodiment 2: Slurry performance test of high-temperature low-density cement slurry system

[0043] Taking the high-temperature and low-density cement slurry system of Example 1 as the test object, first weigh and mix the solid dry ash component and the liquid water component of the high-temperature and low-density cement slurry system for mixing, and then mix them according to the standard GB / T 19139 -2003 "Oil well cement test method" to prepare slurry. The test results are shown in Table 1.

[0044] Table 1 Paddle performance of high temperature and low density cement slurry system

[0045]

Embodiment 3

[0046] Embodiment 3: Compressive strength test of high temperature and low density cement slurry system

[0047] Taking the high-temperature and low-density cement slurry system of Example 1 as the test object, first weigh and mix the solid dry ash component and the liquid water component of the high-temperature and low-density cement slurry system for mixing, and then mix them according to the standard GB / T 19139 -2003 "Oil well cement test method" to prepare the slurry, first thicken it under the preset high temperature and high pressure conditions for 60 minutes, so that the temperature of the cement slurry reaches equilibrium, then cool the cement slurry to the circulating temperature at the top, slowly release the pressure and take it out Slurry cup, slurry slurry is poured into the curing mold for curing, and the compressive strength is measured. The test results are shown in Table 2.

[0048] Table 2 Compressive strength performance of high temperature and low density c...

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Abstract

The invention provides a novel high-temperature and low-density cement paste system, mainly aims at solving the problems of poor anti-fluid-channeling, slow low-temperature strength development and high-temperature sedimentation of the existing high-temperature and low-density cement paste, and is suitable for high-temperature well cementation of low-pressure easily leaked segments, long cementing segments and large-temperature-difference segments of deep wells and ultra-deep wells. The novel high-temperature and low-density cement paste system comprises the following components in parts by weight: 100 parts of oil well cement, 50-80 parts of coal ash, 30-40 parts of silica sand, 24-76 parts of active reinforcing agent I, 13-60 parts of active reinforcing agent II, 8.0-17 parts of high-temperature fluid loss agent, 0.2-0.8 part of high-temperature retarder, 0.0-0.5 part of dispersing agent and 140-200 parts of water. The novel high-temperature and low-density cement paste system has adjustable density of 1.40-1.60g / cm<3>, can be used for well cementation in the range of 70-150 DEG C, has the advantages of good high-temperature stability, strong anti-fluid-channeling capability and high low-temperature strength, can greatly reduce the high-temperature well cementation cost and has wide application prospect.

Description

technical field [0001] The invention relates to high-temperature cement well cementing technology, in particular to a high-temperature and low-density cement slurry system, which is especially suitable for high-temperature and low-density well cementing operations such as long sealing sections of deep wells and ultra-deep wells, long sealing sections with large temperature differences, and the like. Background technique [0002] Cementing is the process of injecting cement into the annular space between the borehole wall and the casing. The main purpose of cementing is to seal off the underground oil and gas water layer, prevent the upper and lower collusion, and establish a long-term, stable and safe channel for oil and gas production. At present, more than 40% of my country's remaining domestic oil and gas resources are distributed in deep layers, and 72.7% of the large oil and gas fields discovered in the past five years are in deep layers. Therefore, deep oil and gas re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
CPCC09K8/467C09K8/493
Inventor 王成文徐伟祥孟凡昌孟仁洲
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)