High-pressure-bearing temporary plugging agent

A temporary plugging agent, high pressure technology, applied in the field of plugging agent, can solve the problems of long cement injection process, high cost, high risk of drill plug sticking, etc., achieve controllable curing time, low cost, avoid Effect of stuck pipe risk

Inactive Publication Date: 2015-04-01
中国石油集团川庆钻探工程有限公司川东钻探公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of injecting cement plugs takes a long time, usually 2-3 days; the cost is high, which is 100,000-150,000 yuan based on the operating cost of 50,000 yuan / day; the risk of plugging and drilling plugs is high

Method used

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  • High-pressure-bearing temporary plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: Weigh 100 parts of water, 3 parts of bentonite, 0.3 part of xanthan gum, 3 parts of retarder, 70 parts of slag gelling agent, 3 parts of filler and 100 parts of barite powder, add in the mud tank, Stir for 30 minutes to obtain a high-pressure temporary plugging agent.

[0009] The tested high-pressure temporary plugging agent has a density ranging from 1.4 to 1.9 g / cm3 and an applicable temperature range of 70°C to 130°C.

Embodiment 2

[0010] Embodiment 2: Weigh 100 parts of water, 5 parts of bentonite, 0.5 part of xanthan gum, 5 parts of retarder, 110 parts of slag gelling agent, 6 parts of filler and 200 parts of barite powder, add in the mud tank, Stir for 40 minutes to obtain a high-pressure temporary plugging agent.

[0011] The tested high-pressure temporary plugging agent has a density ranging from 1.4 to 1.9 g / cm3 and an applicable temperature range of 70°C to 130°C.

Embodiment 3

[0012] Embodiment 3: Weigh 100 parts of water, 5 parts of bentonite, 0.4 part of xanthan gum, 4 parts of retarder, 100 parts of slag gelling agent, 5 parts of filler and 150 parts of barite powder, add in the mud tank, Stir for 30 minutes to obtain a high-pressure temporary plugging agent.

[0013] The tested high-pressure temporary plugging agent has a density ranging from 1.4 to 1.9 g / cm3 and an applicable temperature range of 70°C to 130°C.

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Abstract

The invention discloses a high-pressure-bearing temporary plugging agent. The high-pressure-bearing temporary plugging agent is characterized by comprising the following components in parts by weight: 100 parts of water, 3-5 parts of bentonite, 0.3-0.5 part of xanthan gum, 70-110 parts of a slag-type gelatinizing agent, 3-6 parts of a filling agent, 3-5 parts of a retarder and 10-200 parts of barite powder. The high-pressure-bearing temporary plugging agent disclosed by the invention has the advantages of simple formula, low cost, short curing time and convenient operation; the risk of blocking of a drill caused by a cementing plug is avoided, the tripping operation required by the cementing plug is decreased, the drilling plug is avoided, the operation time for packing an open hole section by virtue of the conventional tie-backing well-cementation plug is facilitated to be shortened; the construction of the temporary plugging agent is simple, which meets the on-site pumping requirement; and the high-pressure-bearing temporary plugging agent can be widely applied in petroleum and natural gas drilling.

Description

technical field [0001] The invention relates to a plugging agent, in particular to a high-pressure temporary plugging agent. Background technique [0002] The high-pressure temporary plugging process involves plugging operations or temporary plugging operations before cementing operations in oil and natural gas drilling. In the process of oil and natural gas drilling, after the liner cementing in some deep wells, the target layer is drilled first, and then the tie-back casing is cemented. During tie-back cementing, there is an open-hole section in the lower part, and the formation pressure coefficient is low. Lost circulation is prone to occur during cementing and cementing, which affects the quality of cementing and increases the difficulty of cementing. [0003] In order to ensure the cementing quality, a cement plug with a length of 100-150m is placed in the injection section below the bell mouth of the tailpipe to realize temporary plugging of the open hole. After the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514
CPCC09K8/514
Inventor 刘德平刘滨付华才卓云陈涛
Owner 中国石油集团川庆钻探工程有限公司川东钻探公司
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