Fortified collapse proof well drilling liquid

A technology of drilling fluid and sulfonated lignite, applied in the field of drilling fluid, can solve the problems of lower mud shale expansion, salt gypsum layer pollution, collapse and other problems, and achieves the effects of strong sealing and wall-building, reducing pollution and reducing emissions

Inactive Publication Date: 2007-01-31
西部钻探吐哈钻井公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Completely solve the pollution of the salt-gypsum layer and the expansion, shrinkage and collapse of the lower mud shale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Component

[0013] See Table 3 for the range of drilling fluid performance during drilling.

[0014] Performance

[0015] The Pu-8 well was drilled at a depth of 2600 meters. During the construction process, there was no tripping and jamming. The success rate was 100% after logging one time. The cementing operation was smooth, the drilling fluid performance was easy to maintain, and the average borehole diameter of the borehole was expanded. The rate is 10.83%, and the caliper expansion rate of complex well sections is 12.27%.

Embodiment example 2

[0017] Component

[0018] The drilling depth of the Pu-11 well is 2736 meters. There is no jamming during the construction process. The logging is twice and the success rate is 100%. The cementing operation is smooth, and the performance of the drilling fluid is easy to maintain during the construction process. The average caliper expansion rate of the wellbore is 9.15%, and the caliper expansion rate of complex well sections is 11.19%.

Embodiment example 3

[0020] Component

[0021] The performance range of the drilling fluid during the drilling process is shown in Table 6.

[0022] Performance

[0023] The drilling depth of Shen 281 Well is 2850 meters. The performance of the drilling fluid is easy to maintain during the construction process. There is no jamming phenomenon during the construction process. The success rate of the first log is 100% after logging twice. The cementing operation is smooth. The average caliper expansion rate of the wellbore is 8.92%, and the caliper expansion rate of complex well sections is 12.65%.

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Abstract

The present invention relates to an enhanced anti-caving drilling fluid for safely drilling in saline bed and caving ground. Said drilling fluid composition includes (by weight portion) 4-6 portions of bentonite, 0.3-0.4 portion of hydrolyzed polyacrylamide potassium salt, 1-1.2 portions of methyl polyacrylamide calcium salt; 1.5-2 portions of valchovite, 2-3 portions of sulfonated lignite, 2-4 portions of asphalt blocking agent, 6-8 portions of Kcl, 0.4 portion of CaO, 1-1.2 portions of organosilicon alcohol and 100 portions of water.

Description

Technical field [0001] The invention relates to a drilling fluid, in particular to a safety drilling enhanced anti-collapse drilling fluid used for salt-gypsum layers and easily collapsed formations. Background technique [0002] In the exploration and development process of the Tuha Oilfield’s Pubei and Shenquan blocks in the eastern part of Xinjiang, there were serious undercutting, stuck drills, stuck in electrical surveys, stuck in cementing, etc. due to the instability of the well wall. A series of problems; mainly manifested in the serious pollution of the drilling fluid during the drilling of the upper salt-gypsum layer, the rheology is difficult to control, the filtration loss is large, and the wall-blocking ability is poor; the lower formation absorbs water and expands, causing the borehole to shrink , Collapse, and the continuous occurrence of complex accidents in the wells have brought huge economic losses to drilling operations, severely hindered the exploration and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/02E21B33/13E21B21/00
Inventor 邹和均邱正松王卫国黄承建乔国文张增福马世清刘光忠张金山
Owner 西部钻探吐哈钻井公司
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