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A well killing fluid, a preparing method thereof and applications of the well killing fluid

A technology of killing fluid and action, applied in the field of killing fluid and its preparation, can solve the problems of adsorption and retention damage, difficulty in ensuring reservoir protection effect, etc., and achieve good pumpability, reduce adsorption and retention damage, and facilitate flowback. Effect

Active Publication Date: 2017-03-22
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Jia Hu (Chinese patent CN201510290186.3) proposed a well killing method combined with water shutoff. It is feasible to use surface pre-crosslinked polymer gel or gel particles as oil and gas well killing fluid, but the above gel Viscous characteristics, easy to cause adsorption and retention damage, difficult to ensure reservoir protection effect

Method used

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  • A well killing fluid, a preparing method thereof and applications of the well killing fluid
  • A well killing fluid, a preparing method thereof and applications of the well killing fluid
  • A well killing fluid, a preparing method thereof and applications of the well killing fluid

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preparation example Construction

[0034] The present invention also provides the preparation method of the above-mentioned kill fluid, comprising the following steps: adding the second crosslinking agent, the third crosslinking agent, homogeneous, and the first crosslinking agent to the aqueous solution in which the stabilizer and the polymer are dissolved, generating The cross-linking reaction forms a fluid gel.

[0035] Further, in a preferred embodiment of the present invention, dissolving the stabilizer and the polymer in the aqueous solution refers to dissolving the stabilizer and the polymer in water at room temperature and mixing them uniformly.

[0036] In a preferred embodiment of the present invention, in the step of forming a fluid gel through the cross-linking reaction, the time for the cross-linking reaction is 1-3 hours. Preferably, the gel strength of the flowable gel reaches grade C to ensure its pumpability.

[0037]In a preferred embodiment of the present invention, after the cross-linking r...

Embodiment 1

[0041] In the well killing fluid provided in this embodiment, the raw materials of the well killing fluid include 2% polymer, 0.05% of the first crosslinking agent, 1% of the second crosslinking agent, and 0.1% of the third crosslinking agent in terms of mass percentage , 0.02% stabilizer and the balance of water.

[0042] Wherein the polymer is partially hydrolyzed polyacrylamide; the first crosslinking agent is aluminum citrate; the second crosslinking agent is a mixture of hexamethylenetetramine and formaldehyde; the third crosslinking agent is divinylbenzene; the stabilizer It is a mixture of EDTA and thiourea.

[0043] The preparation method of the above well killing fluid.

[0044] First, prepare materials according to the proportion of killing fluid raw materials. Slowly add stabilizer and polymer to the water and stir well. Then add the second cross-linking agent and the third cross-linking agent, and continue to stir until uniform; add the first cross-linking agent...

Embodiment 2

[0046] In this embodiment, a well killing fluid is provided. In terms of mass percentage, the raw materials of the well killing fluid include 1.5% polymer, 0.05% first crosslinking agent, 1% second crosslinking agent, 0.1% third crosslinking agent agent, 0.02% stabilizer and the balance of water.

[0047] Wherein the polymer is partially hydrolyzed polyacrylamide; the first crosslinking agent is chromium acetate; the second crosslinking agent is a mixture of resorcinol and polyethyleneimine; the third crosslinking agent is divinylbenzene and N, A mixture of N-methylenebisacrylamide; the stabilizer is a mixture of EDTA and thiourea.

[0048] The difference between the preparation method of the killing fluid and the preparation method of the killing fluid in Example 1 is that the reaction time at room temperature after adding the first cross-linking agent is 3 hours, and after the killing fluid of the preliminary gel is obtained, the reaction time at 150 degrees Heating at ambi...

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Abstract

A well killing fluid, a preparing method thereof and applications of the well killing fluid are provided. Raw materials of the well killing fluid include, by mass, 1-5% of a polymer, 0.05-0.2% of a first crosslinking agent, 0.5-2% of a second crosslinking agent, 0.05-0.2% of a third crosslinking agent and 0.015-0.025% of a stabilizing agent, with the balance being water. The well killing fluid is gel with fluidity at the ground temperature, can rapidly form elastic gel at a high temperature in the pit, and has advantages of temperature resistance, pressure resistance, good pump injecting performance, a simple preparing process, and elasticity characteristics facilitating flowback plug removal, and the like. The preparing method of the well killing fluid is also disclosed. The method has advantages of simple raw materials and a short preparing process. The well killing fluid is used for oil repairing and well killing of high-temperature low-pressure oil wells and gas wells.

Description

technical field [0001] The invention relates to the field of oil and gas chemical industry, and in particular to a killing fluid and its preparation method and application. Background technique [0002] Most of my country's oil and gas fields have entered the middle and late stages of development. Production wells are generally produced with diseases, and the number of such production wells is increasing. Workover operations are very frequent. Reservoir protection has received great attention during the workover process. Especially for high-temperature and low-pressure oil and gas wells, leaks are likely to occur during workover operations and contaminate the reservoir. The thermal stability puts forward higher requirements. [0003] For the workover of high temperature and low pressure oil and gas wells, higher requirements are put forward for the thermal stability and pressure resistance of the killing fluid, which increases the difficulty of resuming production. In view...

Claims

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Application Information

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IPC IPC(8): C09K8/512
Inventor 贾虎陈昊
Owner SOUTHWEST PETROLEUM UNIV
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