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Temporary blocking fluid for steering acid fracturing of carbonate rocks

A carbonate rock and fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of reservoir damage, limited use temperature, and low pressure bearing capacity of temporary plugging agents, and achieve High plugging efficiency and pressure bearing capacity, strong applicability, and good plugging performance

Active Publication Date: 2019-04-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to overcome the defects of the prior art, such as low plugging pressure resistance, limited use temperature, and damage to the reservoir, and provide a kind of plugging agent with good plugging performance, high temperature resistance, and low damage to the reservoir. Temporary plugging fluid and its preparation method to better serve the needs of acid fracturing in deep tight low-permeability carbonate rocks

Method used

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Examples

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Effect test

Embodiment

[0040] This embodiment provides a temporary plugging fluid for acid pressure diversion in carbonate rocks. The temporary plugging fluid includes: water, lignocellulose, high temperature resistant and saturated salt denatured starch, starch grafted acrylate, sodium lauryl sulfate And dodecyltrimethylammonium bromide, the water, lignocellulose, high temperature resistant saturated salt modified starch, starch grafted acrylate, sodium lauryl sulfate and dodecyltrimethylammonium bromide The mass ratio of ammonium is: 100: 0.20: 0.22: 0.21: 1.50: 1.50; wherein, the preparation method of the high temperature resistant and saturated salt modified starch is as follows: first kneading polyacrylonitrile, caustic soda and water, and raising the temperature by 110 Add cornstarch after hydrolysis at ℃ for 1 hour, add modifier polyethylene after cooling down to 60℃, and adjust the pH value to 7 before adding initiator potassium persulfate and sodium bisulfite, potassium persulfate and sodium...

Embodiment 1

[0046] The temporary blocking fluid temporary blocking strength test result of embodiment 1 is shown in Table 1;

[0047] Table 1

[0048] time (min)

[0049] It can be seen from the test data in Table 1 that the injection pressure at the core injection end reaches 39.4 MPa after 60 minutes of the temporary plugging fluid in this embodiment, that is, the temporary plugging fracture strength of the temporary plugging fluid is 39.4 MPa. Therefore, the temporary plugging fluid of the present invention has high plugging strength.

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Abstract

The invention discloses temporary blocking fluid for steering acid fracturing of carbonate rocks. The temporary blocking fluid comprises water, lignocellulose, high-temperature-resistant anti-saturation salt modified starch, super absorbent resin, sodium dodecyl sulfate and dodecyl trimethyl ammonium bromide, and the mass ratio of the water, the lignocellulose, the high-temperature-resistant anti-saturation salt modified starch, a starch grafted acrylate water-absorbing expansion material, sodium dodecyl sulfate and dodecyl trimethyl ammonium bromide is 100: (0.1-0.3): (0.1-0.3): (0.1-0.3): (1.0-2.0): (1.0-2.0). The blocking pressure bearing ability of the temporary blocking fluid is greater than 39 MPa, the temperature resistance reaches 140 DEG C, reverse discharge is facilitated, and the temporary blocking fluid has good application potentiality and high market value.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and more specifically relates to a temporary plugging fluid for acid fracturing in carbonate rocks. Background technique [0002] Acid fracturing is one of the main production and injection measures used in low-permeability oil and gas fields at home and abroad. However, due to the strong heterogeneity of the reservoir, conventional acidizing and fracturing techniques are limited in the scope of reservoir reconstruction; at the same time, with the prolongation of production time, the artificial fractures formed in the early stage are gradually closed or flooded, resulting in unsatisfactory production of oil and gas wells . At present, one of the main means to solve this kind of problem is acid fracturing diversion, that is, to use temporary plugging agent to temporarily plug artificial fractures generated in the previous stimulation, change the extension direction of new fractures, and achieve ...

Claims

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Application Information

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IPC IPC(8): C09K8/514C08G81/02C08B31/00
CPCC08B31/00C08G81/02C09K8/514
Inventor 贺甲元张汝生张雄崔佳李凤霞罗攀登刘长印方裕燕黄志文侯帆
Owner CHINA PETROLEUM & CHEM CORP
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