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High temperature cementing material system and composition

A cementing and systemic technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems affecting the production and safety of oil and gas wells, formation sealing failure, strength decline, etc., to solve strength decline and reduce emissions The effect of stability of quantity and high temperature mechanical properties

Active Publication Date: 2017-05-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in a higher temperature environment, the oil well cement + 40% silica sand system will still experience strength decline and even cracking, resulting in failure of formation isolation and seriously affecting the production and safety of oil and gas wells

Method used

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  • High temperature cementing material system and composition
  • High temperature cementing material system and composition
  • High temperature cementing material system and composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Composition of high temperature cementing material system

[0029] A high-temperature cementing material system can be composed of the following oxides, etc., and the mass fraction of each substance is specifically: SiO 2 51.4 parts, Al 2 o 3 9.8 parts for CaO, 30.2 parts for CaO, CaCO 3 5.6 parts, ZrO 2 1.2 parts for ZnO, 1.0 parts for LiBO 2 ·8H 2 O is 0.8 parts.

Embodiment 2

[0030] Example 2: Performance test of high temperature cementing material system slurry

[0031] Taking the high-temperature cementing material system in Example 1 as the test object, first weigh and mix the solid dry ash component and the liquid water component of the high-temperature cementing material system for slurry preparation, and then mix them according to the standard GB / T 19139-2003 "Oil Well Cement Test Method" Prepare the slurry. The test results are shown in Table 1.

[0032] Table 1. Paddle body performance of high temperature cementing material system

[0033] Numbering water solid ratio Density / (g / cm 3 )

Embodiment 3

[0034] Example 3: Compressive Strength Test of High Temperature Cementing Material System

[0035] Taking the high-temperature cementing material system in Example 1 as the test object, first weigh and mix the solid dry ash component and the liquid water component of the high-temperature cementing material system for slurry preparation, and then mix them according to the standard GB / T 19139-2003 "Oil well cement test method" prepares slurry, and measures compressive strength after high temperature and high pressure curing. The test results are shown in Table 2.

[0036] Table 2 Compressive strength performance of high temperature cementing material system

[0037]

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Abstract

The invention provides a novel high-temperature well-cementing material system, which mainly solves the problems of high-temperature strength degradation and poor high-temperature mechanical stability in the existing oil-well cement and is suitable for the field of oil-gas well cementing. The novel high-temperature well-cementing material system is composed of the following components in parts by mass: 36-71 parts of SiO2, 3.5-25 parts of Al2O3, 18-52 parts of CaO, 2.0-10 parts of CaCO3, 0.7-3.8 parts of XaOb, 0.0-5.0 parts of ZnO and 0.0-4.5 parts of MaBbOc.dH2O. The high-temperature well-cementing material system can satisfy the well cementing operation for deep wells, ultradeep wells and high-temperature high-pressure oil-gas wells, is convenient for on-site construction and low in cost, can obviously reduce the discharge amount of CO2 as compared with the oil-well cement production, and has wide application prospects.

Description

technical field [0001] The invention relates to a high-temperature cementing material system for deep wells and ultra-deep wells, in particular to a high-temperature-resistant cementing material system and its composition. Background technique [0002] Exploration and development of deep oil and gas resources has become an important field of oil and gas development in my country, and cementing will face prominent ultra-deep and deep well high-temperature cementing problems. As we all know, under high temperature conditions (temperatures exceeding 110°C), oil well cement has the phenomenon of strength decline and rapid increase in permeability. The common solution is to add 30-40% silica sand to the cement to make the hydrated calcium silicate gel (CSH) CaO and SiO 2 The (C / S) molar ratio (average 1.5) is reduced to around 1.0, preventing the conversion of CSH gel to α-C 2 SH hydrates, allowing the CSH gel to transform to Ca at temperatures above 110 °C 5 Si 6 o 16 (OH) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42
CPCC09K8/46
Inventor 王成文孟凡昌王瑞和徐伟祥
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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