High-temperature-resistant non-silicate cement paste system for cementing thermal production well of thickened oil

A technology for thermal recovery of high-temperature cement and heavy oil, which is applied to drilling compositions, chemical instruments and methods, etc., and can solve the problems affecting the recovery efficiency of heavy oil thermal recovery wells, gas bubbling at the well site, casing damage, etc. , to achieve the effect of adjustable density and thickening time, convenient on-site construction and broad application prospects

Active Publication Date: 2013-03-27
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, as far as the production site of domestic heavy oil wells is concerned, during the production of heavy oil, since the temperature of the steam injected into the formation can reach 300°C~350°C, the thermal stability of the cement stone in the oil well after adding sand will still decrease, and the thermally recovered oil taken out from the downhole After the cement stone becomes loose, the permeability increases sharply. On site, interlayer fluids channel through each other, the phenomenon of wellhead pressure is serious, gas and bubbles around the well site are serious, and casing damage is serious, which greatly shortens the production l

Method used

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  • High-temperature-resistant non-silicate cement paste system for cementing thermal production well of thickened oil
  • High-temperature-resistant non-silicate cement paste system for cementing thermal production well of thickened oil
  • High-temperature-resistant non-silicate cement paste system for cementing thermal production well of thickened oil

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] Formula: 100 parts of high temperature resistant cement, 1 part of polyvinyl alcohol, 4 parts of melamine formaldehyde resin, 0.5 part of limestone, 15 parts of 300 mesh slag and 60 parts of water.

[0030] High temperature resistant cement is made by mixing component A and component B in a weight ratio of 1:1. The chemical composition of component A and the clinker mineral composition of component B are as follows:

[0031]

[0032]

Example Embodiment

[0033] Example 2

[0034] Formula: 100 parts of high temperature resistant cement, 2 parts of hydrolyzed polyacrylonitrile, 3 parts of calcium lignosulfonate, 2 parts of boric acid, 50 parts of 800 mesh fly ash and 80 parts of water.

[0035] High temperature resistant cement is made by mixing component A and component B in a weight ratio of 1:1. The chemical composition of component A and the clinker mineral composition of component B are as follows:

[0036]

[0037]

Example Embodiment

[0038] Example 3

[0039] Formula: 100 parts of high temperature resistant cement, 4 parts of carboxymethyl cellulose, 1 part of sodium hexametaphosphate, 3 parts of sodium borate, 80 parts of 1500 mesh slag and 120 parts of water.

[0040] High temperature resistant cement is made by mixing component A and component B in a weight ratio of 1:1. The chemical composition of component A and the clinker mineral composition of component B are as follows:

[0041]

[0042]

[0043] 2. Performance test of high temperature resistant non-Portland cement slurry system for heavy oil thermal recovery well cementing

[0044] In Example 1, Example 2, and Example 3, cement slurries were prepared according to the cement slurry API test standards, and the density, fluidity, fluid loss, compressive strength, and thickening time of the cement slurry were measured. The engineering performance results of the heat-resistant cement slurry system for thermal production well cementing are shown in Table 1, th...

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Abstract

The invention relates to a high-temperature-resistant non-silicate cement paste system for cementing a thermal production well for thickened oil. The high-temperature-resistant non-silicate cement paste system is composed of the following components in parts by weight: 100 parts of high-temperature-resistant cement, 1.0-4.0 part(s) of fluid loss agent, 1.0-4.0 part(s) of dispersant, 0.5-3.0 part(s) of thickening time control agent, 60-120 parts of water and 15-80 parts of heat regulators, wherein the high-temperature-resistant cement is formed by mixing components A and B, the component A comprises 50-77 parts of Al2O3, 0.5-8.0 part(s) of SiO2, 0.5-2.5 part(s) of Fe2O3 and 0-0.4 part of R2O(Na2O+0.658K2O), and the component B comprises 33-63 parts of 3CaO.Al2O3.CaSO4, 14-37 parts of 2CaO.SiO2 and 15-35 parts of 6CaO.Al2O3.2Fe2O3. The high-temperature-resistant non-silicate cement paste system disclosed by the invention has great significance to enhancement of safe and efficient development of the thickened oil and has broad market prospect.

Description

technical field [0001] The invention relates to a high-temperature-resistant non-portland cement slurry system, which is especially suitable for heavy oil thermal recovery wells, geothermal wells, ultra-deep wells, etc. Well cementing operations. Background technique [0002] At present, the recoverable reserves of conventional crude oil in the world are estimated to be 1272×108m 3 , the recoverable reserves of heavy oil are about 1510×108m 3 , more than 70% of the world's remaining oil resources are heavy oil resources; more than 27% of my country's land oil and gas resources are heavy oil, and more than 65% of marine oil and gas resources are heavy oil; land heavy oil is mainly distributed in oil fields such as Liaohe, Henan, and Karamay in Xinjiang. Heavy oil is mainly distributed in the Bohai Sea, the East China Sea and the South China Sea; Liaohe Oilfield is the largest heavy oil production base in China, with heavy oil production accounting for more than 60% of the to...

Claims

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Application Information

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IPC IPC(8): C09K8/467C09K8/487
Inventor 李早元程小伟郭小阳伍鹏杨绪华王岩李明许雯婧王伟童杰武治强关素敏
Owner SOUTHWEST PETROLEUM UNIV
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