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Water plugging agent for carbonatite and preparation method and using method thereof

A carbonate rock, water blocking agent technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc. problems, to achieve the effect of improving oil recovery, not easy to disperse or dilute, and strong cementation performance

Inactive Publication Date: 2010-05-26
北京德美高科科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] In view of this, the present invention proposes a water shutoff agent and a water shutoff method for carbonate rock oil wells, which are used to solve the problems in the related art that the water shutoff agent is not suitable for high temperature and high salinity environments, poor adhesiveness, density Large, unable to effectively control water and reduce oil recovery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Firstly, the carbonate rock oil well water shutoff agent is prepared by the following preparation method.

[0035] (1) Preparation method:

[0036] Step 1, put 72.78 parts by weight of water in the mixing container, add 0.29 parts by weight of cement flocculant into the water, stir evenly, make it fully dissolve, and become the first solution;

[0037] Step 2, adding 1.46 parts by weight of polyacrylamide to the above-mentioned first solution, stirring evenly to fully dissolve it to become the second solution;

[0038] Step 3, adding 8.73 parts by weight of quartz to the above-mentioned second solution, stirring evenly to fully dissolve it to become a third solution;

[0039] Step 4, adding 10.92 parts by weight of fly ash or clay to the above-mentioned third solution, stirring evenly to become the fourth solution;

[0040] Step 5: Add 5.82 parts by weight of cement into the fourth solution and stir evenly to become the water shutoff agent of this embodiment. The den...

Embodiment 2

[0055] This embodiment provides a water blocking agent for carbonate rock oil wells, which is composed of the following raw materials in parts by weight: 14.75 parts of cement, 4.42 parts of quartz, 4.79 parts of clay (clay is used as a density reducer), polyacrylamide Ammonia 1.84 parts (polyacrylamide as grid structure agent), cement flocculant 0.44 parts, water 73.75 parts. The density of the water blocking agent is 1.14g / cm 3 , the compressive strength of the cement formed by the consolidation of the water blocking agent is 1.0Mpa.

[0056] The preparation method and use method of the water shutoff agent provided in this example are the same as those in the above-mentioned Example 1, and will not be repeated here.

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Abstract

The invention provides a water plugging agent for carbonatite and a preparation method and a using method thereof. The water plugging agent consists of the following raw materials in part by weight: 5 to 14 parts of cement, 4 to 8 parts of quartz, 0.1 to 0.5 part of cement flocculating agent, 4 to 11 parts of density lightening admixture, 1 to 2 parts of grid structure agent and 72 to 74 parts of water. The water plugging agent has high bonding strength and low density, and is suitable for high-temperature and high-mineralization carbonatite oil wells so as to solve the problem that the water plugging agent in the prior art is not suitable for the high-temperature and high-mineralization environment, has poor bonding strength and high density, and cannot effectively control water or improve the oil recovery ratio.

Description

technical field [0001] The invention relates to specialized chemicals for oil field exploitation, in particular to a water shutoff agent for carbonate rock oil wells. The invention also relates to a preparation method and a use method of the water blocking agent. Background technique [0002] The main oil-producing intervals of high-yield oil wells in carbonate reservoirs are usually geological conditions with large fractures and large caves. The reservoirs have obvious heterogeneity characteristics, and at the same time, there are large bottom water bodies associated with oil wells. [0003] In the process of exploiting carbonate oil wells, once the bottom water breaks through and enters the reservoir, due to the density difference between crude oil and bottom water (the density of crude oil is 0.8g / cm 3 , the density of bottom water is 1.14g / cm 3 ), the water cut of the reservoir rises rapidly, which will suppress the reservoir in the production layer of the oil well and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/473E21B33/13
Inventor 张德斌薄启炜何君赵海洋余代美苑胜利冯德成
Owner 北京德美高科科技股份有限公司
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