Drilling fluid for drilling horizontal well by filling nitrogen

A technology of nitrogen filling and drilling fluid, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of discounting the advantages of nitrogen filling drilling, difficult to control performance, prolonging the well construction period, etc. Low water volume and strong slump suppression effect

Inactive Publication Date: 2013-09-25
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is no specific drilling fluid system for nitrogen-filled drilling at home and abroad, and ordinary drilling fluid systems are used in construction, which has problems such as lack of pertinence and difficult performance control. Due to drilling fluid problems, a large amount of non-production time is caused, which prolongs construction. The well cycle greatly reduces the advantages of nitrogen filling drilling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A drilling fluid system for nitrogen-filled drilling of horizontal wells is prepared by the following formula:

[0028] Viscosifier 0.35 kg specifically: high viscosity carboxymethyl cellulose H-CMC molecular formula is [C 6 h 7 o 2 (OH) 2 CH 2 COONa] n 0.1 kg and xanthan gum XCD molecular formula is (C 35 h 49 o 29 ) n 0.15 kg and 0.1 kg of high viscosity polyanionic cellulose PAC-HV;

[0029] 0.20 kg of fluid loss control agent is specifically 0.15 kg of polyanionic cellulose PAC-LV and 0.05 kg of hydroxyethyl cellulose HEC;

[0030] 4.5 kg of anti-slump agent is specifically 4.5 kg of potassium chloride KCL;

[0031] 1.8 kg of temporary plugging agent is specifically 1 kg of modified starch (ASR-1) and 0.8 kg of 1250 mesh superfine calcium carbonate (ASP-1250);

[0032] 0.6 kg of lubricant 0.6 kg of oil-based lubricant (DFL-1) for specific drilling fluid;

[0033] 0.15 kg of defoamer is specifically 0.15 kg of silicone defoamer;

[0034] 0.1 kg of pH reg...

Embodiment 2

[0044] A drilling fluid system for nitrogen-filled drilling of horizontal wells is prepared by the following formula:

[0045] Viscosifier 0.29 kg is specifically: high viscosity carboxymethyl cellulose H-CMC molecular formula is [C 6 h 7 o 2 (OH) 2 CH 2 COONa] n 0.08 kg and xanthan gum XCD molecular formula is (C 35 h 49 o 29 ) n 0.13 kg and 0.08 kg of high viscosity polyanionic cellulose PAC-HV;

[0046] 0.17 kg of fluid loss control agent is specifically 0.13 kg of polyanionic cellulose PAC-LV and 0.04 kg of hydroxyethyl cellulose HEC;

[0047] 4.3 kg of anti-slump agent is specifically 4.3 kg of potassium chloride KCL;

[0048] 1.65 kg of temporary plugging agent is specifically 0.90 kg of modified starch (ASR-1) and 0.75 kg of 1250 mesh superfine calcium carbonate (ASP-1250);

[0049] 0.50 kg of lubricant 0.50 kg of oil-based lubricant (DFL-1) for specific drilling fluid;

[0050] 0.12 kg of defoamer is specifically 0.12 kg of silicone defoamer;

[0051] 0.08...

Embodiment 3

[0054] A drilling fluid system for nitrogen-filled drilling of horizontal wells is prepared by the following formula:

[0055] Viscosifier 0.41 kg is specifically: high viscosity carboxymethyl cellulose H-CMC molecular formula is [C 6 h 7 o 2 (OH) 2 CH 2 COONa] n 0.12 kg and xanthan gum XCD molecular formula is (C 35 h 49 o 29 ) n 0.17 kg and high viscosity polyanionic cellulose PAC-HV 0.12 kg;

[0056] 0.23 kg of fluid loss control agent is specifically 0.17 kg of polyanionic cellulose PAC-LV and 0.06 kg of hydroxyethyl cellulose HEC;

[0057] 4.3 kg of anti-slump agent is specifically 4.3 kg of potassium chloride KCL;

[0058] 1.95 kg of temporary plugging agent, specifically 1.10 kg of modified starch (ASR-1) and 0.85 kg of 1250 mesh superfine calcium carbonate (ASP-1250);

[0059] 0.70 kg of lubricant 0.70 kg of oil-based lubricant (DFL-1) for specific drilling fluid;

[0060] 0.18 kg of defoamer is specifically 0.18 kg of silicone defoamer;

[0061] 0.12 kg o...

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Abstract

The invention discloses a drilling fluid system for drilling a horizontal well by filling nitrogen, and relates to the technical field of drilling fluid systems for drilling horizontal wells by filling nitrogen. The drilling fluid system disclosed by the invention comprises the following components in parts by weight: 0.29-0.41 parts of thickening agent, 0.17-0.23 parts of fluid loss agent, 4.3-4.7 parts of anti-collapse agent, 1.65-1.95 parts of temporary plugging agent, 0.50-0.70 parts of lubricating agent, 0.12-0.18 parts of defoaming agent, 0.08-0.12 part of pH adjustor and 91.71-92.89 parts of water. The drilling fluid system disclosed by the invention is used in the horizontal well under-balance drilling operation by filling nitrogen in the Changqing oilfield in the Ordos basin is used, therefore, the well can be effectively purified; the well wall is kept steady under negative pressure conditions; hydrocarbon reservoirs are protected; the mechanical drilling speed is increased; furthermore, the drilling fluid system is wide in material source and is easy to operate; the field drilling construction is convenient.

Description

[0001] technical field [0002] The invention relates to the technical field of drilling fluid systems for nitrogen-filled drilling of horizontal wells, in particular to a drilling fluid system suitable for nitrogen-filled drilling of horizontal wells in Ordos Basin of Changqing Oilfield. Background technique [0003] Air-filled drilling fluid is a kind of drilling fluid with a density ranging from 0.47 to 0.83g / cm 3 The mixture of gas (usually air or nitrogen) and liquid (usually water or oil) between the wells, the gas is continuously injected into the drilling fluid through the ground equipment during drilling, so that it is uniformly dispersed in the drilling fluid in the form of bubbles, so as to achieve reduction For the purpose of annulus fluid column pressure, nitrogen-filled drilling fluid technology has been introduced from abroad to China. [0004] For example, the authors are Yao Dehui, Li Jiancheng and Yan Xiuliang, etc., published the paper "Application of Aer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/10
Inventor 蒋振伟张建斌贾军喜林海杨赟贾俊张振活王锐郑玉辉陈磊董海东郝超凡帆张吕艳刘婷婷
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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