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Low-solid-content reservoir protection workover fluid and preparation method thereof

A technology for reservoir protection and workover fluid, applied in the field of petroleum exploration, can solve problems such as the reduction of daily oil production of self-blowing wells, rapid coning of bottom-hole water, low solid phase reservoirs, etc., and achieves good reservoir protection performance, The preparation process is simple and feasible, and the composition of raw materials is simple.

Inactive Publication Date: 2016-07-06
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As oil and gas fields enter the middle and late stages of development, the formation pressure coefficient drops significantly, and the density of the workover fluid is much greater than the formation pressure coefficient. Under the positive pressure difference, the workover fluid will leak and lose during operation, causing formation pressure If there is a shortfall, a large amount of leakage will induce rapid coning of bottom well water, resulting in a significant decrease in the daily oil production of the self-flowing well or stop flow, and it will also cause a large increase in water cut after workover, resulting in low-solid reservoir protection blockage, Reservoir damage such as sensitivity damage and liquid phase traps, thereby reducing oil and gas recovery and development benefits

Method used

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  • Low-solid-content reservoir protection workover fluid and preparation method thereof
  • Low-solid-content reservoir protection workover fluid and preparation method thereof
  • Low-solid-content reservoir protection workover fluid and preparation method thereof

Examples

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Embodiment 1

[0029] This embodiment provides a low-solid reservoir protection workover fluid. The raw material composition of the low-solid reservoir protection workover fluid includes pregelatinized starch and saturated sodium chloride anti-salt and anti-corrosion brine, pregelatinized starch The ratio of the weight to the volume of saturated sodium chloride anti-salt anti-corrosion brine is 100:300.

[0030] The above-mentioned low-solid reservoir protection workover fluid is prepared through the following steps:

[0031] Weigh 100 parts by weight of water, put it into a 400mL goblet, then add 0.4 parts by weight of caustic soda to it while stirring at 4000r / min at room temperature, and stir for 5min after the addition;

[0032] Add 10 parts by weight of sodium carboxymethyl starch to the goblet at a speed of 4000r / min, stir for 20 minutes, and wait for the solution to become white and viscous to obtain pregelatinized starch;

[0033] Take 300 parts by weight of water, put it in a 400mL...

Embodiment 2

[0040] This embodiment provides a low-solid reservoir protection workover fluid, which is prepared through the following steps:

[0041] Take 100 parts by weight of water, put it into a 400mL goblet, add 1 part of caustic soda to it while stirring at 4000r / min at room temperature, and stir for 5 minutes after the addition;

[0042] Add 10 parts by weight of hydroxypropyl starch to the goblet at a speed of 4000r / min, stir for 20 minutes after the addition, and wait for the solution to become white and viscous to obtain pregelatinized starch;

[0043] Take 300 parts by weight of water, put it in a 400mL goblet, and add 96 parts by weight of sodium chloride at 4000r / min until it is completely dissolved.

[0044] Add 6 parts by weight of 800-mesh calcium carbonate at a rotating speed of 4000r / min, and stir for 5 minutes after the addition is completed until the mixture is evenly dispersed;

[0045] Add 3 parts by weight of formaldehyde at a speed of 4000 rpm, and stir for 5 minut...

Embodiment 3

[0050] This embodiment provides a low-solid reservoir protection workover fluid, which is prepared through the following steps:

[0051] Take 100 parts by weight of water, put it into a 400mL goblet, add 1 part by weight of caustic soda to it while stirring at room temperature at 4000r / min, and stir for 5 minutes after the addition;

[0052] Add 10 parts by weight of potato starch at a rotating speed of 4000r / min, stir for 20 minutes after the addition is complete, and wait for the solution to become white and viscous to obtain pregelatinized starch;

[0053] Take 300 parts by weight of water, put it in a 400mL goblet, add 96 parts by weight of sodium chloride at 4000r / min until completely dissolved;

[0054] Add 6 parts by weight of 1200-mesh calcium carbonate at a rotating speed of 4000r / min, and stir for 5 minutes after the addition is complete until the mixture is evenly dispersed;

[0055] Add 3 parts by weight of dodecyl dimethyl benzyl ammonium chloride at a rotating s...

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Abstract

The invention provides low-solid-content reservoir protection workover fluid and a preparation method thereof.The low-solid-content reservoir protection workover fluid comprises pre-gelatinized starch and salt-resistant and corrosion-resistant saturated sodium chloride water, wherein the ratio of the weight of the pre-gelatinized starch to the volume of the salt-resistant and corrosion-resistant saturated sodium chloride water is 80-100:300-350.The pre-gelatinized starch comprises, by weight, 10 parts of modified starch, 0.4-1.0 parts of sodium hydroxide and 100 parts of water.The salt-resistant and corrosion-resistant saturated sodium chloride water comprises, by weight, 100 parts of water, 32 parts of sodium chloride, 2-4 parts of acid-soluble shielding temporary plugging agent, 4 parts of sterilizing agent, 2 parts of corrosion inhibitor and 0.1-0.2 part of defoaming agent.The low-solid-content reservoir protection workover fluid has the advantages that the workover fluid is stable in performance, and mud cake can be acidized and degraded.

Description

technical field [0001] The invention relates to a workover fluid and a preparation method thereof, in particular to a low-solid reservoir protection workover fluid and a preparation method thereof, and belongs to the technical field of petroleum exploration. Background technique [0002] Preventing blowout and protecting oil and gas layers are important technical measures in the process of petroleum exploration and development, and the quality of the work is directly related to the comprehensive economic benefits of exploration and development. [0003] Preventing blowout of oil and gas wells is a worldwide well control technical problem, and blowout accidents of oil and gas wells occur almost every year at home and abroad. As oil and gas fields enter the middle and late stages of development, the formation pressure coefficient drops sharply, and the density of the workover fluid is much greater than the formation pressure coefficient. Under the positive pressure difference,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514
CPCC09K8/514C09K2208/32
Inventor 张洁陶卫方徐俊杰陈俊阳小平刘翀赵志良王双威杨峥张蝶郑金亚
Owner BC P INC CHINA NAT PETROLEUM CORP
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