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Self-removing temporary plugging agent composition for acidizing oil and water wells in oil fields

A technology of composition and temporary plugging agent, which is applied in drilling compositions, wellbore/well components, chemical instruments and methods, etc., can solve the problem of difficult to meet the needs of acidification, fracturing construction, low softening point of wax spheres, Affecting the normal operation of oil wells, etc., to achieve the effect of improving the stimulation effect, low cost and convenient operation

Active Publication Date: 2016-03-02
BEIJING YILONG HENGYE PETROLEUM ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the field application shows that the disadvantage of this technology is that the wax ball particles have a low softening point, low melting point, and poor pressure resistance, which makes it difficult to meet the needs of on-site acidizing and fracturing construction.
[0005] In order to improve the acidizing effect of oil and water wells, overcome the difficulties of hard plastic plugging balls used in the prior art to flow back from the formation, affect the production capacity and normal production of oil wells, and solve the difficulty in meeting the construction requirements when using wax balls due to their low melting point problem, the present invention provides a temporary plugging agent composition, which can temporarily plug the perforation holes of oil-water wells in high-permeability formations at the beginning, and then at a formation temperature of 60-90°C, within 4-8 hours Self-melting not only eliminates the problem of flowback of the plugging balls in the prior art, but also solves the problem that some hard plastic plugging balls return to the formation and get stuck in the pump and affect the normal operation of the oil well. Well productivity

Method used

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  • Self-removing temporary plugging agent composition for acidizing oil and water wells in oil fields

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Making a temporary blocking ball

[0027] Choose a viscosity of approximately 150 x 10 4 mPa.s, 180×10 4 mPa.s and 195×10 4 mPa.s crude oil (produced from Tahe, Xinjiang) and paraffin (purchased from Cangzhou Xintai Wax & Rubber Industry Co., Ltd., 70# microcrystalline wax), epoxy resin 6304 (purchased from Henan Liyuan Industrial Co., Ltd.), according to the table below The content shown in 1, heated on the injection molding machine to melt and stir it evenly, then injection molded, and after cooling, spheres with diameters of 11, 14 and 16mm were obtained.

Embodiment 2

[0028] Example 2. Temporary blocking ball melting performance test

[0029] Put three temporary plugging balls with different diameters of 11mm, 14mm, and 16mm prepared in Example 1 into crude oil samples (collected from Zhongyuan Oilfield), and place them in constant temperature water baths at 50°C, 70°C, and 90°C respectively, and record See attached table 1 for the starting time of melting and the time of complete melting.

[0030] Table 1 Statistical table of temporary blocking ball performance test

[0031]

[0032] It can be seen from the test results that the temporary plugging ball starts to melt at a temperature of about 50-90°C at a temperature of about 380 minutes-398, and about 490-560 Completely melt within minutes (equivalent to completely melt after acidizing construction), so it can well meet the requirements of conventional oil and water well acidizing construction.

Embodiment 3

[0033] Embodiment 3. Indoor temporary blockage simulation test

[0034]Using the temporary plugging simulation test device, take 1.5m diameter 76mm tubing, seal one end, and drill 4 holes with a diameter of 12mm at an azimuth angle of 90° on the tubing wall to simulate perforation blastholes. Use a rubber hose to connect tap water to inject to simulate the situation of downhole operation. It can be seen that when no temporary blocking ball is added, all the water flows out of the small hole. Then, 5 temporary plugging balls with a diameter of 12 mm prepared in Example 1 Test No. 2 were put into it, and it was found that the temporary plugging balls were carried by the water flow close to and cling to the inner side of the oil pipe hole, and were compacted on the hole due to the effect of pressure difference, thereby The small hole can be blocked, and it is observed that except for a small amount of water flowing out from the small hole that is not tightly blocked, most of the...

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Abstract

A temporary plugging agent composition capable of temporarily plugging a high-permeability oil layer and automatically melting at the temperature of the oil layer, mainly comprising high-viscosity crude oil, a proper amount of curing agent and a forming agent. The temporary plugging agent composition of the present invention can be pressed into a temporary plugging product of a suitable shape by pressing a mold. During the acidification construction of oil and water wells, it can preferentially enter the high-permeability formation with the acid liquid for temporary plugging, so as to limit the acid liquid from entering the high-permeability formation. In this way, more acid liquid can enter the low-permeability layer to achieve the purpose of transforming the poor layer; and then it can be melted at the formation temperature, so that the formation permeability of the high-permeability layer can be restored, and the acidizing production capacity of oil and water wells can be improved.

Description

technical field [0001] The invention belongs to the technical field of petroleum engineering and oil field chemistry, and in particular relates to a temporary plugging agent composition for acidizing oil and water wells in an oil field, a temporary plugging product prepared from the composition and its application. Background technique [0002] In the middle and late stages of oilfield development, oil-water wells often have multiple layers and multiple stages of simultaneous production and injection. Due to the large difference in porosity and permeability between layers, high-permeability layers are often high-yielding layers, while low-permeability layers are low-yielding layers. Reservoir acidification reformation is needed to increase the productivity of oil and water wells. However, when implementing oil layer acidification stimulation measures, due to the large difference in formation permeability in the vertical direction, the acid liquid enters the high permeabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/502E21B33/138
CPCC09K8/502E21B33/138
Inventor 王海丁福庆王维星孟爱鲁张学锋亢政勋曹鲁
Owner BEIJING YILONG HENGYE PETROLEUM ENG TECH