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Sulfur-resistant liquid rubber plug and preparation method thereof

A liquid and rubber plug technology, applied in the field of sulfur-resistant liquid rubber plug and preparation, can solve the problems of broken glue, lack of sulfur resistance, difficult to meet the construction of temporary plugging and killing wells in sulfur-containing gas fields, etc. good stability

Active Publication Date: 2021-07-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current liquid rubber plugs do not have sulfur resistance. Since the liquid rubber plugs are more sensitive to the pH value, for the workover operations of sulfur-containing gas wells, when the liquid rubber plugs are used for temporary plugging, the gel will break in a short time, which is difficult Satisfying the temporary plugging and well killing construction of sour gas fields

Method used

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  • Sulfur-resistant liquid rubber plug and preparation method thereof
  • Sulfur-resistant liquid rubber plug and preparation method thereof
  • Sulfur-resistant liquid rubber plug and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation method of 100g liquid rubber stopper: first mix the solid thickener and liquid thickener evenly according to the mass ratio of 1:1, which is defined as the liquid rubber stopper thickener, and then add 5-7g cross-linking agent, 5- 6g conditioner, 1-1.5g anti-sulfur agent, stir at high speed to dissolve evenly, then add 6-7g liquid rubber stopper thickener, stir for 5-10 minutes, then replenish water until the mass of the whole liquid rubber stopper system is 100g, and then reuse The ph regulator adjusts the ph of the liquid rubber stopper system to 8-9, continues to stir for 10-20 minutes, puts it into an oven at 65-70 ° C, and after standing for half an hour, it is formulated into a high-strength sulfur-resistant liquid rubber stopper, and then Test the performance of liquid rubber stoppers.

[0028] 1.1 Viscoelasticity test of liquid rubber stopper

[0029] The viscoelasticity of the liquid rubber plug and the viscosity at high temperature affect its use ...

Embodiment 2

[0037] Liquid rubber stopper anti-H 2 S stability test

[0038] For workover operations of sulfur-containing gas wells, when liquid rubber plugs are used for temporary plugging, since liquid rubber plugs are more sensitive to pH, it is necessary to consider the influence of hydrogen sulfide on the stability of liquid rubber plugs. We have selected two sulfur-resistant agent, the two formulations are: (1) 6%-7% thickener + 5%-7% cross-linking agent + 5-6% conditioner + pH regulator + 1%-1.5% anti-sulfur agent 1# (sodium thiosulfate); (2) 6%-7% thickener+5%-7% crosslinking agent+5-6% conditioning agent+pH regulator+1%-1.5% anti-sulfur agent 2#( Basic zinc carbonate), the pH value of the liquid rubber stopper is 8. Taking the liquid rubber stopper formula without anti-sulfur agent 6%-7% thickener + 5%-7% cross-linking agent + 5-6% conditioning agent + pH regulator as a blank experiment, the test is under certain temperature conditions, Gas layer water containing hydrogen sulfi...

Embodiment 3

[0044] Effect of liquid rubber stopper formula on gel strength

[0045] After determining the solid thickener and liquid thickener, we studied the gelation of the liquid rubber stopper under the conditions of different thickener concentrations and different crosslinking agent concentrations, and used the gel visual code to characterize the liquid glue. The strength of the plug, wherein the meaning of the gel visual code is shown in Table 3 below. The mass ratio of solid thickener: liquid thickener is 1:1 to make thickener. The specific experimental results are shown in Table 4.

[0046] Table 3 Gel visual inspection code

[0047]

[0048]

[0049] Table 4 Liquid Rubber Stopper Formula

[0050]

[0051]

[0052] It can be seen from the experimental results that when the concentration of the thickener is greater than 6%, the gelling strength of the liquid rubber stopper has reached the level of the ringing gel, and the increase in the amount of the thickener does ...

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Abstract

The invention discloses a sulfur-resistant liquid rubber plug and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing a solid thickening agent and a liquid thickening agent according to a mass ratio of 1: 1 to obtain a liquid rubber plug thickening agent; sequentially adding 5%-7% of a cross-linking agent, 5%-6% of a conditioner and 1%-1.5% of an anti-sulfur agent into water, and stirring at a high speed to uniformly dissolve; and adding 6-7% of a thickening agent, stirring for 5-10 minutes, regulating the pH value of the liquid rubber plug system to 8-9 by using a pH regulator, continuously stirring for 10-20 minutes, putting the liquid rubber plug system into an oven at 65-70 DEG C, and standing for half an hour to obtain the sulfur-resistant liquid rubber plug. The ground gelling time of the liquid rubber plug can be adjusted within 0.5-3 h, the gelling strength is high, the liquid rubber plug can reach the seismic gel level, the liquid rubber plug does not break gel after being aged for 24 h at the temperature of 150 DEG C and does not break gel in sulfur-containing gas layer water at the temperature of 70 DEG C, the H2S-resistant stability is good, and the liquid rubber plug can be suitable for well repair operation of sulfur-containing gas wells.

Description

technical field [0001] The invention relates to the field of oil and gas, in particular to a sulfur-resistant liquid rubber plug and a preparation method thereof. Background technique [0002] With the continuous increase of deep wells, ultra-deep wells, unconventional, high-temperature and high-pressure oil and gas wells, most wells have problems such as downhole tubing string and wellhead device corrosion damage, tubing scaling, tubing string buckling, deformation and fracture, and workover operations are required. The temporary plugging and killing plug technology uses the principle of high-concentration polymer solution cross-linking in the wellbore to form a high-strength viscoelastic plug in the wellbore to isolate the killing fluid from the production layer and prevent the killing fluid from leaking into the wellbore. Formation, and greatly reduce the wellhead pressure to ensure the safety of subsequent workover operations under pressure. However, the current liquid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514C09K8/512
CPCC09K8/514C09K8/512
Inventor 许园唐永帆杨健黄晨直
Owner PETROCHINA CO LTD