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Oil well cement high temperature retarder

A technology of oil well cement and retarder, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problem that the thickening time is not easy to control, the retarder's retarding effect is unstable, and the application temperature range of the retarder is narrow. and other problems, to achieve the effects of good cementing quality, good regularity and operability, and easy thickening time

Active Publication Date: 2012-02-29
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The currently widely used retarders mainly include: lignosulfonate, sugar compounds, organic phosphates, inorganic acids, etc., but these retarders all have certain defects: some retarders have a narrow applicable temperature range; Although the retarder is suitable for a wide range of temperatures, it has a certain impact on the dehydration of the cement slurry, the stability of the slurry, and the development of strength; With the increase of temperature, there is a nonlinear change, and the thickening time is not easy to control

Method used

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  • Oil well cement high temperature retarder
  • Oil well cement high temperature retarder
  • Oil well cement high temperature retarder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0024] Add 1 part by weight of seawater in a 500ml beaker, then add gluconic acid, potassium sodium tartrate, carboxymethyl hydroxyethyl cellulose and styrene sulfonate, the addition of parts by weight of each component, as shown in Table 1, stir Stir for 60 seconds at a speed of 4000rpm to obtain a high-temperature retarder for oil well cement. The retarder is prepared at a rate of 1.90g / cm 3 The properties of cement paste are shown in Table 1.

[0025] Table 1 Oil well cement high temperature retarder components and their preparation 1.90g / cm 3 Grout properties

[0026]

[0027]

[0028] Note: BWOC is the percentage of cement mass.

Embodiment 5～8

[0030] Add 1 part by weight of fresh water in a 500ml beaker, then add citric acid, sodium glucoheptanate, hydroxyethyl cellulose and fatty acid methyl ester sulfonate, the addition of parts by weight of each component, as shown in Table 2, at stirring speed Stir for 60 seconds at 4000rpm to prepare a high-temperature retarder for oil well cement. The retarder is prepared at a rate of 1.40g / cm 3 The properties of cement paste are shown in Table 2.

[0031] Table 2 Oil well cement high temperature retarder components and their preparation 1.40g / cm 3 Grout properties

[0032]

[0033]

Embodiment 9～12

[0035] Add 1 weight of fresh water in a 500ml beaker, then add glucoheptanoic acid, potassium citrate, carboxymethyl hydroxyethyl cellulose and methacryl sulfonate, the addition weight parts of each component, as shown in table 3, Stir for 60 seconds at a stirring speed of 4000rpm to obtain a high-temperature retarder for oil well cement. The retarder is prepared at a rate of 2.30g / cm 3 The properties of cement paste are shown in Table 3.

[0036] Table 3 Oil well cement high temperature retarder components and their preparation 2.30g / cm 3 Grout properties

[0037]

[0038]

[0039] It can be seen from the composition and effects shown in Table 1, Table 2 and Table 3 that the cement slurry prepared by the high-temperature retarder has a wider application temperature than the previous high-temperature cementing cement slurry, and the bottom of the cementing well The circulating temperature can reach 200°C, and the static temperature can reach 250°C, which can meet the a...

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Abstract

The invention relates to an oil well cement high temperature retarder applied to the technical field of oil field well drilling and completion. The invention is characterized in that: the retarder is composed of 1 part by weight of water, 0.005-0.030 part by weight of hydroxycarboxylic acid and salt thereof, 0.005-0.010 part by weight of cellulose derivative and 0.0001-0.0010 part by weight of sulfonate. The high temperature retarder has wide applicable temperature range, can be applied to cement paste systems with various densities, has strong compatibility with a plurality of admixture systems, and does not influence the performance of cement paste. The cement paste prepared by the retarder is stable, the thickening transition time is short, and the thickening time is adjustable; the hardened cement paste has rapidly developed compression strength and is suitable for the requirement of well cementation engineering.

Description

technical field [0001] The invention relates to a cement admixture used in the cementing field of oilfield well completion technology, which belongs to a high-temperature retarder. Background technique [0002] The high-temperature retarder of the invention is a cement admixture used for cementing operations in the field of oil and gas well completion. The purpose of the cementing operation is mainly to prevent formation fluids from crossing each other, to seal off complex formations such as severe leakage layers or other collapses, and to form cemented support casings. In addition, it can also prevent underground fluids from corroding casings. [0003] Thickening time is one of the important indexes of cementing operation. Appropriate thickening time can ensure that the cement slurry remains liquid and pumpable during the pumping displacement process, avoiding bridge blockage of the cement slurry during the pumping process, and ensuring the safe operation of cementing cons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
Inventor 邢秀萍高永会谢承斌王金芬张清玉
Owner BC P INC CHINA NAT PETROLEUM CORP
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