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Micro-foam drilling fluid

A drilling fluid and foam technology, applied in the field of drilling fluid, can solve the problems of complex drilling, not yet involved in the field of cementing quality, oil layer pollution, etc., to achieve the effect of reducing density, good oil layer protection effect, and eliminating leakage

Active Publication Date: 2009-12-30
DAQING PETROLEUM ADMINISTRATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the application of microfoam drilling fluid at home and abroad is mainly to solve the problems of drilling complexity and oil layer pollution in low-pressure areas prone to leakage, and has not yet involved the field of cementing quality

Method used

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Embodiment 1

[0037] Tamuchage Oilfield belongs to the buried hill fault block oilfield. The Tongbomiao oil layer is mainly low-pressure, with well-developed micro-fractures and good permeability. Lost circulation is very easy to occur during drilling. In 2008, 4 wells lost circulation. The qualified rate of cementing is only 80%. We tested the micro-foam drilling fluid system in 3 wells in this block, and achieved remarkable results. The lost circulation rate was 0, the cementing quality rate was 100%, and the oil and gas layers were effectively protected. At the same time, the drilling fluid has an obvious effect in increasing the ROP.

[0038] In well Ta19-334-t209, after the second opening (300 meters) of well washing, the amphoteric ion polymer drilling fluid was used to drill, and the drilling fluid prepared by the method of indoor experiment (2) was added to the well depth of 900 meters, and at the same time Start all agitators and solid control equipment to increase the amount of g...

Embodiment 2

[0040] Well Xu 129-91 in Block Xu 211 was drilled to a depth of 1480 meters, and the drilling fluid prepared by the method of indoor experiment (2) was added, and the agitator and solid control equipment were started to increase the amount of gas mixing, so that the air bubbles were evenly mixed on the ground and circulated. After 2 weeks, the drilling fluid Marsh funnel has a viscosity of 61s and a density of 1.06-1.09g / cm 3 , the water supply of the mud pump is normal, the circulating pressure is reduced from 9.5MPa to 8.5MPa, the water loss is reduced from 4.8ml to 4.2ml, and other indicators meet the design requirements. The cementing quality is high-quality, the electric logging is successful once, the well diameter is regular, the tripping and tripping is smooth, and there is no jam display, and no short tripping operation has been performed in the whole well. It can be seen from the completion electrical logging curve that the amplitude difference of the micro-electrode...

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Abstract

The invention discloses a micro-foam drilling fluid. The micro-foam drilling fluid comprises the following compositions: 40 to 50 grams of bentonite, 3 to 5 grams of composite foaming agent, 2 grams of xanthan, 3 grams of high-viscosity carboxymethyl cellulose, 3 grams of sodium carbonate, 2 to 3 grams of strong zwitterionic coating agent, 5 grams of partially-hydrolyzed polyacrylonitrile ammonium salt, 5 grams of organic silicon humic acid kalium, 5 grams of lignite resin and 1 grams of viscosity reducer for the drilling fluid in each liter of the drilling fluid, wherein the composite foaming agent consists of lauryl sodium sulfate and sodium dodecyl benzene sulfonate according to mass ratio of 7:3. The drilling fluid has low density, good shielding effect and remarkable anti-leaking effect of a low-pressure easy-to-leak layer and can effectively improve the quality of well cementation.

Description

Technical field: [0001] The invention relates to a drilling fluid used in the field of oil field drilling, and belongs to a recyclable three-phase water-based microfoam drilling fluid. Background technique: [0002] Micro-foam drilling fluid technology was introduced from abroad in the early 21st century. This micro-foam system uses certain surfactants and polymers to combine to produce a micro-foam, forming a micro-foam that can prevent or delay the drilling fluid from invading the formation. Foam network is mainly used in depleted oil reservoirs, low-pressure formation drilling, underbalanced wells and horizontal well drilling in foreign countries. [0003] Domestically, after 2002, Shengli, Turpan-Hami, Sichuan, Xinjiang and other oilfields successively began to study, and achieved good results, mainly solving the serious well leakage and oil layer pollution problems encountered in low-pressure leaky formations. [0004] At present, the application of micro-foam drilling...

Claims

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Application Information

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IPC IPC(8): C09K8/38C09K8/035C09K8/42
Inventor 张海山李国庆韩昌刘聚廷
Owner DAQING PETROLEUM ADMINISTRATION
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