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Method for preparing down-hole gel valve and construction method thereof

A gel valve and gel breaking technology, which is applied in the direction of wellbore/well components, drilling composition, earthwork drilling and mining, etc., can solve the problems of high construction cost and damage to the reservoir, and achieve cost reduction, cost saving, The effect of reliable technical support

Inactive Publication Date: 2010-08-18
吐哈石油勘探开发指挥部工程技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome the disadvantages of damage to the reservoir and expensive construction costs in the current conventional well killing construction method

Method used

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  • Method for preparing down-hole gel valve and construction method thereof
  • Method for preparing down-hole gel valve and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: The downhole jelly valve of the present invention was put on trial in the construction of nitrogen underbalanced drilling in Well Ya 940 in Yumen Oilfield.

[0047] On June 15, 2007, the nitrogen underbalanced drilling well in Ya 940 Well of Yumen Oilfield successfully tried the downhole gel valve technology during tripping out and screen completion, and a total of 4.6m of colloid was injected. 3 , A 240-meter-long downhole gel valve (commonly known as: slug) is formed in the wellbore. After the operation, no oil and gas overflow was found at the wellhead within 16 hours of tripping, screen and casing operation. After the well killing operation, all the colloids were successfully lifted out through gas lift and liquid drainage, and the ignition was successful at one time, realizing the completion of the well. The goal of oil layer protection in the process, and the cost of tools such as casing valves was saved by 2.2 million yuan for a single well.

[004...

Embodiment 2

[0061] Embodiment 2: The downhole gel valve consists of base fluid, cross-linking fluid and gel breaking fluid. The volume ratio of base fluid, crosslinking fluid and gel breaking fluid is: 45%:33%:22%. The specific preparation amount is calculated on site.

[0062] Among them: the volume ratio of the raw material components of the base fluid, crosslinking fluid and gel breaking fluid of the downhole gel valve is:

[0063] A, base liquid: main agent is the guar gum (hydroxypropyl guar gum powder) that Beijing Baofengchun Petroleum Technology Co., Ltd. produces, 2.1%; (sodium hydroxide), 1.1%; bactericide is formaldehyde, 0.5%; water is 96.3%.

[0064] B. Cross-linking liquid: the cross-linking agent is sodium tetraborate pentahydrate produced by Beijing Baofengchun Petroleum Technology Co., Ltd., 0.025%; water is 99.975%.

[0065] C. Gel breaker: The gel breaker is hydrogen peroxide, 0.004%; water is 99.996%.

[0066] The method and injection method for preparing the downh...

Embodiment 3

[0067] Embodiment 3: The downhole gel valve consists of base fluid, cross-linking fluid and gel breaking fluid. The volume ratio of base fluid, crosslinking fluid and gel breaking fluid is: 55%:21%:24%. The specific preparation amount is calculated on site.

[0068] Among them: the volume ratio of the raw material components of the base fluid, crosslinking fluid and gel breaking fluid of the downhole gel valve is:

[0069] A, base liquid: principal agent is the guar gum (hydroxypropyl guar gum powder) that Beijing Baofengchun Petroleum Technology Co., Ltd. produces, 1.1%; (sodium hydroxide), 0.6%; bactericide is formaldehyde, 0.35%; water is 97.95%.

[0070] B. Cross-linking liquid: the cross-linking agent is sodium tetraborate pentahydrate produced by Beijing Baofengchun Petroleum Technology Co., Ltd., 0.045%; water is 99.955%.

[0071] C. Gel breaker: The gel breaker is hydrogen peroxide, 0.003%; water is 99.997%.

[0072] The method for preparing the downhole jelly valv...

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Abstract

The well gel valve preparing process and construction process is applied oil well construction. The gel fluid consists of base fluid 40-60 vol%, cross-linking fluid 20-35 vol%, and cracking fluid 20-35 vol%. The base fluid consists of guar gum 0.5-2.5 vol%, alkali 0.1-2 vol%, formaldehyde 0.2-0.6 vol% and water for the rest; the cross-linking fluid consists of borax 0.02-0.05 vol% and water for the rest; and the cracking fluid consists of hydrogen peroxide 0.001-0.005 vol% and water for the rest. The fluids for the well gel valve are in-situ prepared and injected into well to form the gel valve. The present invention is used in drilling well, completing well and repairing well to replace casing valve and other technological arrangements to separate slurry and kill fluid from the reservoirbed, to avoid the escape of hydrogen sulfide and other gases from the stratum, and to avoid contamination to the reservoir bed.

Description

Technical field: [0001] The invention relates to the technical field of oilfield chemical application and downhole construction, in particular to an downhole jelly valve used in the construction process of oil and gas wells and its preparation and use method. Specifically, it is a method that uses colloid valves to effectively and temporarily separate mud or well killing fluid from oil well reservoirs to protect oil and gas layers and facilitate construction operations. Background technique: [0002] At present, during the drilling, completion and well killing operations of oil and gas wells, the well killing medium used is drilling mud or well killing fluid, and the matching conventional well killing construction method is adopted. Conventional well killing construction method damages the reservoir, the construction cost is expensive, and the construction operation is complicated. During the drilling, completion and workover process of oil and gas wells, pipe string operat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/12C09K8/40
Inventor 雷宇张建利刘德基尹玉川汤发明邓生辉慕红星孙忠杰王涛杨甲苗陈超徐浩
Owner 吐哈石油勘探开发指挥部工程技术研究院
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