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Anti-water-lock workover fluid and preparation method

A technology of workover fluid and water-proof lock, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problem of low temperature resistance of water-proof lock and work-over fluid, and achieves good industrial application prospects and high production feasibility. , the effect of economic security

Active Publication Date: 2016-06-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a waterproof lock workover fluid and its manufacturing method to solve the technical problem of low temperature resistance of the waterproof lock workover fluid in the prior art

Method used

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  • Anti-water-lock workover fluid and preparation method
  • Anti-water-lock workover fluid and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] First, in a 1000ml beaker, measure 320.3g of clear water, heat the temperature to 45°C, and keep the constant temperature, add 90g of potassium chloride and 76.7g of sodium formate, stir for 30min until completely dissolved, showing a uniform solution; then add 3g Xanthan gum, stir for 15 minutes, add 5g anti-high temperature fluid loss reducing agent and stir for 15 minutes until completely dissolved; finally add 2.5g fungicide and stir for 5 minutes, add 2.5g waterproof locking agent 3 and stir for 10 minutes, the waterproof lock workover can be prepared liquid.

Embodiment 2

[0068] First, in a 1000ml beaker, measure 374.25g of clear water, heat the temperature to 45°C, and keep the constant temperature, add 105.5g of potassium chloride and 10g of sodium formate, stir for 30min until completely dissolved and present a uniform solution; then add 2.25 g xanthan gum, stir for 18min, add 5g anti-high temperature dehydration agent and stir for 15min until completely dissolved; finally add 1.5g fungicide and stir for 5min, add 1.5g waterproof lock agent, stir for 10min, the waterproof lock repair can be prepared well fluid.

Embodiment 3

[0070] First, in a 1000ml beaker, measure 473.5g of clear water, heat the temperature to 45°C, and keep the constant temperature, add 10.0g of potassium chloride and 10g of sodium formate, stir for 30min until completely dissolved, showing a uniform solution; then add 1.5g Xanthan gum, stir for 20 minutes, add 2.5g anti-high temperature fluid loss agent and stir for 15 minutes until completely dissolved; finally add 1.0g fungicide and stir for 5 minutes, add 1.5g waterproof lock agent, stir for 10 minutes, and the waterproof lock repair can be prepared well fluid.

[0071] Table 1 is the rheology of the low permeability oilfield waterproof lock workover fluid of the present invention

[0072] Table 1 Basic performance evaluation of workover fluids

[0073]

[0074] Table 2 is the evaluation result of the oil layer protection effect of the waterproof lock workover fluid in the low-permeability oil field of the present invention

[0075] Table 2 Evaluation of oil layer prot...

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Abstract

The invention relates to the field of oilfield workover, discloses anti-water-lock workover fluid and a preparation method, and aims to solve the technical problem of low temperature resistance of the anti-water-lock workover fluid in the prior art. The anti-water-lock workover fluid is prepared from the following components in percentage by weight: 0.3-0.6 percent of xanthan gum, 0.5-2.0 percent of high-temperature-resistant fluid loss agent, 0.2-0.5 percent of sterilizing agent, 0.2-0.5 percent of anti-water-lock agent, 0.5-2.0 percent of inhibitor, and the balance of water. The technical effect of improving the temperature resistance of the anti-water-lock workover fluid is achieved.

Description

technical field [0001] The invention relates to the field of oilfield workover, in particular to a waterproof lock workover fluid and a manufacturing method. Background technique [0002] At present, most of my country's proven undeveloped geological reserves are low-permeability oilfield reserves, accounting for 72.8%. According to the results of my country's third oil and gas resources survey, the low-permeability oil and gas prospective resources are 53.7 billion tons and 24 trillion cubic meters respectively, accounting for 49% and 42.8% of the total national oil and gas prospective resources respectively. Exploration data in recent years show that low-permeability oil fields have become an important field of exploration and development in my country. [0003] Reservoir damage in low-permeability oilfields can be caused in all stages of oilfield exploration and development. Special emphasis on oil layer protection for low-permeability oil layers is not because such oil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52C09K8/584C09K8/58
CPCC09K8/52C09K8/58C09K8/584C09K2208/12
Inventor 王小芳樊松林王煜朱国强刘福鹏郭元庆周小平
Owner PETROCHINA CO LTD
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