Assessment method for leakage stoppage of associated polymer modified cement paste

A technology of associating polymers and evaluation methods, which is applied in the field of oil and gas field development, can solve problems such as low success rate and difficulty in plugging complex leakage layers, and achieve the effect of improving success rate and good resistance to water dilution

Pending Publication Date: 2022-07-01
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] At present, deep well drilling encounters high-pressure water layers, leading to more and more cases of complex lost circulation. Due to the active formation water, conventional plugging methods are difficult to plug such complex lost layers, and the success rate of plugging them with ordinary cement is also low. not tall

Method used

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  • Assessment method for leakage stoppage of associated polymer modified cement paste
  • Assessment method for leakage stoppage of associated polymer modified cement paste
  • Assessment method for leakage stoppage of associated polymer modified cement paste

Examples

Experimental program
Comparison scheme
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Embodiment

[0046] A method for evaluating leakage of associative polymer modified cement slurry, comprising the following steps:

[0047] (1) Preparation of associative polymer modified cement slurry: add 300 g of water in a 500ml beaker, then add a certain mass (as shown in Table 1) of associative polymer dry powder and ultrafine cement dry powder (Xinjiang Aksu Pure Cement) mixed with a vertical mixer at a speed of 600r / min for 30min to make a modified cement slurry.

[0048] The ratio of raw materials of table 1 associative polymer modified cement slurry

[0049] group Associative polymer / g Ultrafine cement / g water / g 1 #

3 337 300 2 #

3.5 336.5 300 3 #

4 326 300 4 #

4.5 315.5 300 5 #

4.5 305.5 300 6 #

5.5 295 300 7 #

5.5 325 300 8 #

6 324 300 9 #

6.6 323.5 300

[0050] (2) Evaluation of flow properties: Test the six-speed, fluidity and density of the above-mentioned modified ...

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Abstract

The invention discloses a method for evaluating the performance of a water stratum plugging material on the basis of associated polymer gel modified cement paste, which is used for further evaluating the properties of fluidity, water and gas insulation, water dilution resistance, gelling resistance and the like on the premise that the plugging material meets curing plugging. And the preferable plugging material is more suitable for the plugging requirement of water-producing complex well leakage. The evaluation method can more objectively evaluate the actual condition of the plugging material in the water outlet stratum for plugging, and provides a reliable method basis for solving the problem of well leakage of the water outlet stratum.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, relates to an evaluation method for associative polymer-modified cement slurry for plugging leakage, and in particular relates to an evaluation method for associative polymer-modified cement slurry used for complex lost circulation and leakage plugging in water-producing formations . Background technique [0002] With the development of oil and gas exploration and development, exploration is directed to deeper formations. Oil drilling operations are deeper and deeper, formation temperature is higher and higher, and vicious and complex lost circulation often occurs when drilling fractures, karst caves, and water-producing formations. Including the phenomenon of drilling fluid entering the leakage layer under the action of pressure difference and causing leakage when the formation pressure is lower than the drilling fluid column pressure due to the existence of cracks or karst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/38
CPCG01N33/383
Inventor 赫英状易浩贾晓斌刘晓民于洋李斐路飞飞方俊伟刘景涛刘彪孙伟光王居贺张红卫邹书强
Owner CHINA PETROLEUM & CHEM CORP
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