Liquid glue stopper for handling borehole wall collapsing

A wellbore collapse and liquid technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve problems such as poor tripping, easy leakage of chemical plugging agents, wellbore expansion, etc., to reduce the comprehensive Operating cost, avoiding serious leakage of plugging agent, and reducing operating time

Inactive Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the deepening of development, there are often complex situations such as wellbore collapse leading to severe expansion of the wellbore, stuck packer string in the wellbore, oil layer plugging, poor tripping, and logging difficulties.
In addition, the mechanical plugging technology currently used has problems such as easy failure of the packer, inconvenient salvage, difficulty in plugging long well sections, and smaller diameter of the wellbore after plugging, while chemical plugging has the problem of easy leakage of the plugging agent , and problems such as poor temperature resistance, adaptability, safety and reliability

Method used

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  • Liquid glue stopper for handling borehole wall collapsing
  • Liquid glue stopper for handling borehole wall collapsing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Main ingredient A20g, including acrylamide 16g, butyl acetate 2g, isopropenyl acetate 2g

[0032] Activator B0.1g, including formaldehyde 0.07g, phenolic resin 0.03g

[0033] Weigh acrylamide, butyl acetate and isopropenyl acetate according to the above standards, and mix them to obtain main agent A; weigh formaldehyde and phenolic resin, and mix them to obtain activator B; add the obtained main agent A and activator B to 75ml of water in turn , stirred for 10 minutes, prepared into a uniform solution, and stirred after swelling for 10 minutes to obtain liquid rubber stopper sample 1#.

Embodiment 2～6

[0035] According to the content of each component shown in Table 1, the liquid rubber stopper samples 2# to 6# were respectively prepared according to the method described in Example 1.

[0036] Table 1

[0037]

Embodiment 7

[0038] Embodiment 7 measures the performance of liquid rubber stopper sample

[0039] Take 50ml of the liquid rubber stopper solutions obtained in Examples 1-6, add them into a vial (50ml) and seal them, put them into an oven at 150° C. to heat and cross-link and time them, and observe the cross-linking situation every 10 minutes. When the sample thickens rapidly, use a HAKKERS150 high temperature rheometer every 10 minutes at a shear rate of 1.5s -1 Measure the strength of the sample. The time when the sample strength reaches the maximum pressure difference of 40MPa is the crosslinking time.

[0040] After the sample strength reaches the maximum pressure difference of 40MPa, observe the gel-breaking situation of the samples in Examples 4-6 every day. When the samples are completely in solution, the gel-breaking is completed, and the time used is the self-gel-breaking time.

[0041] Table 2 shows the measurement results of crosslinking time, withstand pressure difference and...

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Abstract

The invention relates to a liquid glue stopper for handling borehole wall collapsing. The liquid glue stopper comprises, by weight, 200 parts of main agent A, 1-10 parts of activating agent B and 750 parts of water, and preferably, the liquid glue stopper comprises, by weight, 200 parts of main agent A, 5 parts of activating agent B and 750 parts of water. The main agent A is composed of, by weight, 8 parts of acrylamide, 1 part of n-butyl acetate and 1 part of isopropenyl acetate. The activating agent B is composed of, by weight, 7 parts of methanal and 3 parts of phenolic resin. The liquid glue stopper is prepared through the cross-linking reaction of the main agent A and the activating agent B, and the cross-linking time is 5-90 minutes. The liquid glue stopper further comprises a gel breaker C of ammonium persulfate, and the liquid glue stopper comprises, by weight, 200 parts of main agent A, 1-10 parts of activating agent B, 0.4-1.2 parts of gel breaker C and 750 parts of water. The liquid glue stopper is large in hardness and capable of bearing construction with the 40 MPa pressure difference and withstanding the temperature of 150 DEG C. Permanent leaking stoppage can be achieved without adding the gel breaker in the liquid glue stopper, self-gel breaking can be achieved when the gel breaker is added, flowback of the liquid glue stopper is promoted, and pollution to stratums is avoided.

Description

technical field [0001] The invention relates to a novel process technology for oil and gas well testing, production testing and downhole operation, in particular to a liquid rubber plug suitable for open holes, well wall collapse and wellbore fluid loss. Background technique [0002] First of all, open-hole acid fracturing is mostly used for well completion in Tahe Oilfield. After the completion of the open hole, the liquid flows from the formation into the bottom of the well during the production process to produce a "drag force" on the rock on the well wall, that is, tensile failure. With the deepening of development, there are often complex situations such as wellbore collapse leading to severe expansion of the wellbore, stuck packer string in the wellbore, oil layer plugging, poor tripping, and logging difficulties. In addition, the mechanical plugging technology currently used has problems such as easy failure of the packer, inconvenient salvage, difficulty in plugging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/42
CPCC09K8/512C09K8/426C09K8/5045C09K2208/26
Inventor 王雷陈晓华吴臣德何龙高定祥张茂奎刘磊张潇秦飞康红兵田疆
Owner CHINA PETROLEUM & CHEM CORP
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