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Temperature-resisting and salt-resisting self-adhesion emulsion temporary blocking acidification diverting agent and preparation method thereof

A temperature-resistant, salt-resistant, acid-steering technology, used in chemical instruments and methods, drilling compositions, etc., can solve the problems of limited self-viscosifying ability, low emulsion viscosity value, and reduced temporary blocking ability, etc. The effects of a wide temperature and salinity range, low initial viscosity, and high injectability

Inactive Publication Date: 2019-05-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN106543996A discloses a kind of acidification temporary plugging diversion agent, with calcium dodecylbenzenesulfonate as emulsifier, nano SiO 2 The water-in-oil emulsion prepared as an interface stabilizer is only suitable for 90°C sandstone reservoirs, and the evaluation method for this system is relatively simple
With the development of high-temperature and high-salt carbonate reservoirs, especially in ultra-deep wells in Xinjiang, the temperature of oil and gas reservoirs can reach as high as 200°C. The application of conventional emulsion temporary plugging and acidizing diverting agents is limited. When the value is low, the temporary plugging ability drops significantly, and even the effective plugging cannot be completed; when the diverting agent is used in high salinity water conditions, the emulsion stability is poor and the self-viscosifying ability is limited, making it difficult for the acid liquid to enter the low-permeability area

Method used

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  • Temperature-resisting and salt-resisting self-adhesion emulsion temporary blocking acidification diverting agent and preparation method thereof
  • Temperature-resisting and salt-resisting self-adhesion emulsion temporary blocking acidification diverting agent and preparation method thereof
  • Temperature-resisting and salt-resisting self-adhesion emulsion temporary blocking acidification diverting agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of temperature-resistant and salt-resistant self-viscosifying emulsion temporary plugging acidification diverting agent:

[0033] Weigh 10g, 15g, 20g, and 25g of diesel oil respectively, dissolve 1g of oleic acid diethanolamide and 0.2g of polyisobutylene succinimide in the diesel oil, and stir to disperse them evenly; weigh 40g, 35g, 30g, and 25g to remove Ionized water, dissolve 0.1g sodium dodecylbenzene sulfonate in deionized water, and disperse evenly; according to the combination of oil-water ratio 2:8, 3:7, 4:6, 5:5, the active oil is rotated at 2000r / min Under stirring, add active water drop by drop to form a water-in-oil emulsion. Use SNB-2 viscometer to measure 95°C, 170s -1 The viscosity of different oil-water ratio emulsions is shown in Table 1.

[0034] Table 1

[0035] oil to water ratio

[0036] The emulsion prepared above was aged at 200°C for 6 hours, and the emulsification rate results are shown in Table 2.

[0037] Table 2

...

Embodiment 2

[0041] Weigh 15g of diesel oil, dissolve 1g of oleic acid diethanolamide and 0.2g of polyisobutylene succinimide in diesel oil, and stir to make them uniformly dispersed; weigh 35g of deionized water, and dissolve 0.15g of dodecane in deionized water Sodium phenyl sulfonate, evenly dispersed; stir the active oil at 2000r / min, add active water drop by drop to form a water-in-oil emulsion. Use SNB-2 viscometer to measure 170s -1 The viscosity of the emulsion at different temperatures, the measurement results are shown in Table 3.

[0042] table 3

[0043] temperature / ℃

[0044] From Table 3 and image 3 It can be seen that the viscosity of the emulsion decreases with increasing temperature. Since the SNB-2 viscometer used is heated by a water bath, the temperature can be stabilized at 95°C under laboratory conditions. When the temperature is higher than 60°C, the viscosity decrease rate of the temporary plugging agent slows down, and when the temperature reaches 95...

Embodiment 3

[0046] Using the emulsion temporary blocking acidification diverting agent prepared in Example 2, the diverting agent was aged at 200°C for 30 minutes at high temperature, and then the rheological properties were measured at 95°C. The results are shown in Table 4.

[0047] Table 4

[0048]

[0049] From Table 4 and Figure 4 It can be seen that the viscosity of the emulsion decreases with the increase of rotational speed. When the rotational speed is higher than 30r / min, the viscosity decrease rate of the emulsion slows down and finally tends to be stable; when the rotational speed is 10r / min, the viscosity is as high as 879mPa s, and when the rotational speed increases to 99.9r / min, the viscosity drops to 215mPa s, that is, under the condition of high temperature and high shear rate, the viscosity of the emulsion is low and has good pumping ability; after the emulsion enters the formation, as the injection radius increases, the shear rate decreases and the viscosity of the ...

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Abstract

The invention provides a temperature-resisting and salt-resisting self-adhesion emulsion temporary blocking acidification diverting agent. The temperature-resisting and salt-resisting self-adhesion emulsion temporary blocking acidification diverting agent is prepared from diesel oil which accounts for 20 to 40 percent of the two-phase total mass percent, de-ionized water which accounts for 50 to 70 percent of the two-phase total mass percent, oleic diethanolamide which accounts for 1 to 5 percent of the two-phase mass percent, polyisobutylene succinimide which accounts for 0.2 to 1 percent ofthe two-phase mass percent and sodium dodecylbenzene sulfonate which accounts for 0.1 to 0.5 percent of the two-phase mass percent. The emulsion temporary blocking acidification diverting agent is formed by dissolving the oleic diethanolamide and the polyisobutylene succinimide into the diesel oil, dropwise adding the de-ionized water dissolved with the sodium dodecylbenzene sulfonate into activeoil and stirring at a speed of 2000 r / min. The emulsion temporary blocking acidification diverting agent can be applied to diverting acidification of carbonate rock reservoirs with the formation temperature of 200 DEG C and the formation water salinity of 20*10<4> mg / L.

Description

technical field [0001] The invention relates to a temperature-resistant and salt-resistant self-viscosifying emulsion temporary plugging acidification diverting agent and a preparation method, belonging to the technical field of oilfield chemical additives. Background technique [0002] Due to the low permeability of carbonatite reservoir matrix, oil and gas resources are difficult to produce. Moreover, during the drilling and production process, due to the pollution of drilling fluid and the blockage of other particles, the seepage channels such as matrix and fractures are easily blocked, resulting in reduced productivity. In order to effectively decontaminate the near-wellbore area, connect weakly connected and disconnected fractures, and enhance fracture conductivity, acidizing technology is often used to stimulate production of reservoirs. However, for reservoirs with developed edge and bottom water, general acid injection will cause a large amount of water breakthrough...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508
Inventor 李振亮齐宁陈国彬任兴华王雪涛梁冲徐志鹏王一伟潘林
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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