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Well cementing slurry large temperature difference retarder and its preparation method

A technology of cementing slurry and large temperature difference, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., to achieve the effect of weak temperature sensitivity, promoting safety and efficiency, and better retarding effect

Active Publication Date: 2018-03-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems encountered in the field construction of large temperature difference cementing, the present invention aims to provide a large temperature difference retarder for cement slurry and its preparation method

Method used

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  • Well cementing slurry large temperature difference retarder and its preparation method
  • Well cementing slurry large temperature difference retarder and its preparation method
  • Well cementing slurry large temperature difference retarder and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Take by weighing 60 parts of anionic monomer 2-acrylamide-2-methylpropanesulfonic acid, 25 parts of cationic monomer methacryloyloxyethyltrimethyl ammonium chloride ( DMC) and 15 parts of nonionic monomer acrylamide are placed in 330 parts of deionized water and dissolved completely, and 1.0 parts of ammonium persulfate are added as a polymerization initiator;

[0028] (2) Weigh 495 parts of white oil, 52.8 parts of Span 80 and 4.95 parts of Tween 80 according to the mass fraction of each component of the inverse emulsion system and add them to the reactor, adopt the mechanical emulsification method, and control the speed at 15000r / min~25000r / min Pre-emulsify at room temperature for 10 minutes;

[0029] (3) Weigh 330 parts of the solution prepared in step (1) according to the mass fraction of each component of the inverse emulsion system, place it in a constant pressure dropping funnel, slowly add it dropwise for 30 minutes, then stir the system at a constant tempe...

Embodiment 2

[0033] Add the cementing slurry large temperature difference retarder prepared in Example 1 into the corresponding cementing slurry system, and the mass fraction of each component of the large temperature difference cementing slurry system becomes:

[0034]

[0035] When the cementing slurry large temperature difference retarder of the present invention is added to the corresponding cement slurry system, the thickening curves under different conditions of 150°C×50MPa, 100°C×35MPa and 50°C×25MPa are as follows figure 1 , figure 2 and image 3 As shown, the experimental results show that: under the condition of 150℃×75MPa, the thickening time of the large temperature difference cementing slurry system is 324min, and the right angle thickening time is 11min, and the thickening line is good; under the condition of 100℃×35MPa, the large temperature difference cementing slurry system The thickening time of the system is 360min, the right-angle thickening time is 14min, and the ...

Embodiment 3

[0037] Add the cementing slurry large temperature difference retarder prepared in Example 1 into the corresponding cementing slurry system, and the mass fraction of each component of the large temperature difference cementing slurry system becomes:

[0038]

[0039] When the cementing slurry large temperature difference retarder of the present invention is added to the corresponding cement slurry system, under different conditions of 150°C×20MPa, 100°C×20MPa and 50°C×0.1MPa, the strength development of cement stone is as follows Figure 4 shown. Experimental results show that the large temperature difference retarder for well cementing slurry of the present invention can be used in the temperature range of 50°C to 150°C, and the strength of cement stones in both high and low temperature environments can meet the requirements of well cementing construction.

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Abstract

The invention discloses a well cementing slurry large temperature difference retarder and its preparation method, and relates to a field of casing and cementing of exploration and development of oil and gas. The large temperature difference retarder mainly comprises three structure units which are anion monomer 2- acrylamide-2- methyl propanesulfonic acid (AMPS), cationic monomer methylacryloyl yloxyethyl trimethyl ammonium chloride (DMC) and nonionic monomer acrylamide (AM); the mass by part of every component is: AMPS is 60-70 parts, DMC is 20-25 parts and AM is 10-15 parts. The large temperature difference retarder is prepared by an inverse emulsion polymerization method; the inverse emulsion fluid is prepared from, by mass, 60-65 parts of white oil, 35-40 parts of deionized water, 6.0-6.4 parts of Span 80, 0.6-1.0 part of Tween 80. The retarder can realize the retarding function of cement slurry in the whole temperature zone where the upper and lower ends of the cement injection well section for well cementing construction are 50 and 150 DEG C; the comprehensive performance of the cement slurry system can meet the requirement of the well cementing construction of a thermal production well.

Description

technical field [0001] The invention relates to a large temperature difference retarder for cementing slurry with weak temperature sensitivity, which belongs to the field of oil field chemistry and oil and gas well cementing, and successfully solves the problem of super retardation of the cement slurry at the top of the cementing well section in the large temperature difference cementing construction . Background technique [0002] Cementing operation is an extremely important part in the drilling and completion process of oil and gas fields. The quality of cementing is directly related to the oil layer productivity and service life of oil and gas wells. The large temperature difference cementing operation is the key and difficult point in the cementing project. [0003] In the environment of large temperature difference cementing, it is often encountered that the cementing quality is not easy to control. The ultra-retarding phenomenon of cement slurry seriously affects the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C08F220/58C08F220/34C08F220/56C08F2/32C04B24/16C04B103/22
CPCC04B24/163C04B2103/22C08F2/32C08F220/58C08F220/585C09K8/467C08F220/34C08F220/56
Inventor 彭志刚霍锦华张瑞冯茜郑勇
Owner SOUTHWEST PETROLEUM UNIV
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