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Swelled perlite and its preparation method, its uses as modified microbead in producing high intensity low density oil well cement

A technology for expanding perlite and oil well cement, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor density stability, unsatisfactory performance, high water absorption, etc., and achieves low production cost, convenient operation, The effect of strong pressure capacity

Active Publication Date: 2007-05-30
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even the new product of "spherical closed-cell expanded perlite" processed by "expansion-vitrification" technology has a closed-cell rate of only 95%, a spherical rate of only 80%, and a water absorption rate of only 38%. , bulk density is 150~250kg / m 3 , the wall thickness is only 5% to 30% of the diameter of the pellet, it can only be used as a light, heat-insulating, and sound-insulating material, from the point of view of the physical structure of the particle, it has a thin and fragile wall, high water absorption and stable density Technical defects such as poor performance are far from meeting the technical requirements for cementing oil and gas wells under harsh conditions of high temperature and high pressure. So far, there has been no use of expanded perlite as a modified microbead instead of floating beads for the production of high-strength Literature reports on the application of low-density cement slurry in oil and gas well casing operations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of preparation method of expanded perlite, it carries out following steps successively:

[0042] (1) Prepare raw materials: perlite ore is crushed and sieved to make perlite powder, and the particle size is controlled to be 200 mesh;

[0043] (2) Heating pulverization: put the perlite powder prepared in the raw material step into the heating furnace for heating, control the temperature in the heating furnace to be 220° C., and heat for 2 hours to obtain a powder with a water content of ≤1%. Perlite dry powder;

[0044] (3) Low-temperature expansion: send the perlite dry powder prepared in the heating pulverization step into the puffing furnace for rapid roasting for 8 seconds, and control the roasting temperature in the puffing furnace to be 500° C. to obtain thick-walled and hollow perlite expansion material;

[0045] (4) High-temperature vitrification: send the perlite expansion material prepared in the low-temperature expansion step into a vitrification furna...

Embodiment 2

[0049] A kind of preparation method of expanded perlite, it carries out following steps successively:

[0050] (1) Prepare raw materials: pulverize and sieve perlite ore to make perlite powder, and control the particle size to 300 mesh;

[0051] (2) Heating pulverization: put the perlite powder prepared in the raw material step into the heating furnace for heating, control the temperature in the heating furnace to be 280° C., and heat for 1 hour to obtain a powder with a water content of ≤1%. Perlite dry powder;

[0052] (3) Low-temperature expansion: send the perlite dry powder prepared in the heating pulverization step into the puffing furnace for rapid roasting for 12 seconds, and control the roasting temperature in the puffing furnace to be 620° C. to obtain thick-walled and hollow perlite expansion material;

[0053] (4) High-temperature vitrification: send the perlite expansion material prepared in the low-temperature expansion step into a vitrification furnace for high...

Embodiment 3

[0057] The above-mentioned expanded perlite is used as modified microbeads to produce high-strength and low-density oil well cement, and the materials are weighed according to the following weight ratio:

[0058] Oil well cement 100 parts

[0059] Expanded perlite 86 parts

[0060] Lightening material 71 parts

[0061] Stabilizer 29 parts

[0062] Enhancer 8.6 parts

[0063] Dispersant 2.3 parts

[0064] The oil well cement mentioned above refers to the finished oil well cement produced according to conventional technology.

[0065] The above-mentioned lightening materials, stabilizers, reinforcing agents, and dispersants refer to lightening materials of the JH-JQJ type and JH-WG type stabilizers that are available on the market and produced by Sichuan Jiahua Chemical Co., Ltd. Agent, JH-ZQ type enhancer and JH-SPF type dispersant.

[0066] The oil well cement, expanded perlite, lightening material, stabilizer, reinforcing agent and dispersant measured and weighed accord...

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Abstract

The invention discloses a bulking pearlite and making method and application in the high-strength low-density oil well cement, which is characterized by the following: adopting low-temperature bulking and high-temperature glass technique; allocating raw material sequently; heating to form powder; bulking under low-temperature; glassifying under high temperature; cooling; making the grain size at 100-120 order with obturator foramen rate not less than 98% and sucking rate not more than 30%; possessing bearing pressure and excellent slurry fluidity.

Description

Technical field: [0001] The invention relates to a mineral composition and its production method and application, in particular to an expanded perlite, its preparation method and its application as modified microbeads in the production of high-strength and low-density oil well cement. Background technique: [0002] With the continuous improvement of exploration and development technology in my country's petroleum industry, the number of complex wells in low-pressure well areas and new exploration areas is increasing. "Lost circulation" accidents are prone to occur, and the most effective technical measure to solve "lost circulation" is to use cement slurry with a certain strength and low density for interlayer sealing, which is conducive to improving the cementing quality of low-pressure areas and improving oil well performance. Recovery and well life. At present, there are mainly two schemes for the production and preparation of low-density oil well cement: one is to add vis...

Claims

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Application Information

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IPC IPC(8): C04B14/18C04B20/06C04B28/00C09K8/00
CPCC04B14/185C04B20/06C04B35/16
Inventor 钟文阳运霞周军韩建国范有银魏微林张平萍
Owner JIAHUA SPECIAL CEMENT
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