Monovalent salt weighting agent as well as preparation method and application thereof

A technology of weighting agent and organic salt, applied in the field of monovalent salt weighting agent and its preparation, can solve the problems of easily damaged oil reservoir, low density, large leakage of killing fluid, etc. The effect of kicks and blowouts

Active Publication Date: 2018-05-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The killing fluids provided by the prior art that use solid-phase weighting agents are prone to sedimentation, which can block the pore throats and downhole tools of the oil reservoir. oil layer

Method used

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  • Monovalent salt weighting agent as well as preparation method and application thereof
  • Monovalent salt weighting agent as well as preparation method and application thereof
  • Monovalent salt weighting agent as well as preparation method and application thereof

Examples

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preparation example Construction

[0027]In the second aspect, the embodiment of the present invention provides the preparation method of the above-mentioned monovalent salt weighting agent, the preparation method comprising: according to the parts by weight of each component, monovalent organic salt, industrial salt, sodium dihydrogen phosphate, hydrogen phosphate Disodium, potassium phosphate, and optional corrosion inhibitor are mixed and stirred well to obtain a monovalent salt weighting agent.

[0028] Specifically, a stirrer or a mixer can be used to stir, so that the monovalent organic salt, phosphate and optional anti-corrosion agent are mixed and stirred uniformly, wherein the stirring time is 15-22min, for example, the stirring time can be 15min, 16min, 17min, 18min, 19min, 20min, 21min, 22min, etc. The above-mentioned preparation method is simple and time-consuming, can be prepared on site, and is convenient for popularization and use.

[0029] In the third aspect, the embodiments of the present inv...

Embodiment 1

[0035] This embodiment provides a monovalent salt weighting agent, 30 kg of sodium formate, 4 kg of industrial salt, 33 kg of sodium dihydrogen phosphate, 32 kg of disodium hydrogen phosphate, and 3 kg of potassium phosphate are placed in a stirrer and stirred for 15 minutes, namely The monovalent salt weighting agent provided in this example can be obtained.

Embodiment 2

[0037] This embodiment provides a monovalent salt weighting agent, 48 kg of sodium formate, 5 kg of industrial salt, 20 kg of sodium dihydrogen phosphate, 20 kg of disodium hydrogen phosphate, 4 kg of potassium phosphate, and 3 kg of anhydrous sodium sulfite are placed in a mixing Stir in the mixing machine for 18 minutes to obtain the monovalent salt weighting agent provided in this example.

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Abstract

The invention discloses a monovalent salt weighting agent as well as a preparation method and an application thereof and belongs to the field of oilfield chemistry. The monovalent salt weighting agentis prepared from components in parts by weight as follows: 28-48 parts of monovalent organic salt, 4-6 parts of industrial salt, 20-33 parts of sodium dihydrogen phosphate, 19-32 parts of disodium hydrogen phosphate and 3-5 parts of potassium phosphate. Under the synergistic effect of the monovalent organic salt, the industrial salt, sodium dihydrogen phosphate, disodium hydrogen phosphate and potassium phosphate, when the monovalent salt weighting agent and well control fluid are used cooperatively, density of the well control fluid can reach 1.40-1.65 g / cm<3>, the upper limit of density ofthe conventional non-solid saturated well control fluid is broken through, and when the monovalent salt weighting agent is applied to the well control fluid, stable pressure action can be supplied toformation fluid and well kick and blowout are prevented. Besides, the well control fluid adopting the weighting agent can be prevented from precipitation, is low in seepage loss and cannot damage oilreservoirs or block pore throats of the oil reservoirs and downhole tools, and furthermore, the monovalent salt weighting agent contains simple components and is convenient to popularize and use.

Description

technical field [0001] The invention relates to the field of oil field chemistry, in particular to a monovalent salt weighting agent and its preparation method and application. Background technique [0002] With the deepening of exploration and development of oil and gas wells, formation energy will continue to decrease, and oil and gas wells are prone to abnormalities or production shutdowns. Therefore, workover and completion operations must be carried out, and oil well strings must be replaced and optimized to restore oil and gas wells to production. When repairing and completing oil and gas wells, it is necessary to fill the inner wall of the wellbore with killing fluid so that the hydrostatic column formed by the killing fluid can exert downward pressure on the formation fluid, thereby preventing well kick or blowout. Moreover, the killing fluid can also support the tubing to prevent the well wall from collapsing and ensure the safety of workover and well completion ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/504C09K8/52C09K8/54
CPCC09K8/032C09K8/5045C09K8/52C09K8/54C09K2208/32
Inventor 董军韩芳樊松林赵俊峰文国顺周新海李新建
Owner PETROCHINA CO LTD
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