CN1670330A - Treatment method of drilling fluid in sal prunella mine lateral well drilling process - Google Patents
Treatment method of drilling fluid in sal prunella mine lateral well drilling process Download PDFInfo
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- CN1670330A CN1670330A CN 200510038086 CN200510038086A CN1670330A CN 1670330 A CN1670330 A CN 1670330A CN 200510038086 CN200510038086 CN 200510038086 CN 200510038086 A CN200510038086 A CN 200510038086A CN 1670330 A CN1670330 A CN 1670330A
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Abstract
This invention discloses processing method of drilling fluid in salt prunella mine horizontal well process, it belongs to drilling fluid technology field. The procedures are that (1) NaCl is added to increase Cl- content and drilling fluid density in drilling fluid virgin pulp before drilling tool entering salt prunella ore layer or glauberite layer until drilling fluid turn into saturated brine. (2) CMS, CMC or saltproof dehydration agent is added into drilling fluid to reduce drilling fluid water loss. (3) NaHm, collapse proof or salt proof and high temperature proof collapse proof is added to improve mud cake quality and maintain well bore stable. (4) XPJ is added for defoaming. (5) oleiferous lubricant and water base lubricate is added to increase drilling fluid lubricating ability and reduce drilling tool friction, and ensure drilling compress and pulling propitiousness. (6) Certain quantity salt proof crystal agent to prevent salt from crystallizing when temperature is down. The well safety is high, pollution is little, and cost is low.
Description
Technical field
The present invention relates to a kind of drilling fluid processing method, particularly the drilling fluid processing method of salt prunella mine.
Background technology
At present, in the exploitation of salt prunella mine, in order to improve the exploitation benefit in salt, nitre ore deposit, horizontal butt shaft technology has obtained application more and more widely.Promptly beat earlier a bite well (straight well, directional well or horizontal well), boring the horizontal well and the preceding a bite well that cross salt, nitre layer flatly then around again is docked and connected, make salt, nitre layer that more length of exposure be arranged, provide longer notes to adopt passage, realize improving the purpose of exploitation benefit.The horizontal individual well of butt shaft is divided into three well sections, and promptly top is the peupendicular hole section, and its degree of depth requires decision according to salt mine, the middle part is an angle buildup interval, and the bottom is a net horizontal section, and its depth location is at salt, nitre ore bed, because the difference of stratigraphic dip, hole angle is generally the 86-95 degree.When the drillng operation in salt, nitre ore deposit, but because the water-soluble and the creep properties of salt, nitre, further increased the difficulty of construction of horizontal well, horizontal well drilling liquid mainly to solve drilling tool the lifting frictional resistance, add the water-soluble hole enlargement of the pressure of the drill, sal prunella layer, the problem that landwaste carries.Horizontal well drilling is except that selecting suitable drilling tool structure at present, using the oil base drilling fluid system is to carry out the important measures of sal prunella horizontal well construction, promptly when drilling tool creeps into, in drilling fluid magma, add substantial oil, the oil base drilling fluid system can effectively solve a sal prunella horizontal well construction difficult problem, but has several shortcomings to can not be ignored one, poor stability: since oily incendivity, site operation operation fire size class height; Its two, contaminative is big: the environment of working well is dyed by greasy dirt, is difficult to second ploughing; Its three, cost height: oils and additive cost of raw material height; Its four, property of drilling fluid is wayward, easily has an accident: it is very big that the oil base drilling fluid system viscosity is influenced by the well temperature, and well is got over deep-well Wen Yuegao, and viscosity is low more, reduced the lithology of taking of drilling fluid; The density of oil base drilling fluid own is low, for equilibrium strata pressure, need to add a large amount of weighting materials, otherwise, easily wellbore instability takes place and cause bit freezing or landfill drilling tool accident; Increase the weight of in a large number also will significantly improve solid concentration in the drilling fluid, reduce rate of penetration.
Summary of the invention
The processing method that the purpose of this invention is to provide drilling fluid in a kind of salt prunella mine horizontal well drilling process makes the drilling safety height, pollution is little, cost is low.
The object of the present invention is achieved like this: the processing method of drilling fluid in the salt prunella mine horizontal well drilling process may further comprise the steps:
(1), drilling tool enters before sal prunella ore bed or the glauberite layer on it adding NaCl raising Cl in drilling fluid magma
-Content and drilling fluid density are converted into saturated brine until drilling fluid;
(2), in drilling fluid, add CMS, CMC or anti-salt filtrate loss reduction additive and reduce the drilling fluid fluid loss;
(3), add NaHm, anti-collapse dose or anti-collapse dose of improvement of mud cake of salt-resisting high-temperature-resisting and maintenance hole stability;
(4), add the XPJ froth breaking;
(5), add oily lubricant or water base lubricant and improve the drilling fluid lubricating ability and reduce the drilling tool frictional resistance, guarantee creeping into pressurization and pull out of hole and promoting smoothly of drilling tool;
(6), add a certain amount of anti-salt crystallizing agent and stop salt crystallization and harm of causing when temperature reduces.
Above-mentioned steps can be carried out in proper order not according to it, and drilling fluid system of the present invention is a water-base drilling fluid, and site operation operation fire size class is low; Contaminative is less relatively, and the drilling fluid that uses is easily handled; Cost is low, actual cost is less than 40% of oil base drilling fluid, property of drilling fluid is stable: salt itself has higher density, the density of saturated salt-water drilling fluid is also higher relatively, and easily the strata pressure of balance sand mud stone and sal prunella layer keeps hole stability, the water-base drilling fluid temperature influence is little, performance is controlled easily, because salt solution is saturated, has stoped the further corrosion of sal prunella layer; The sliding agent of capacity has guaranteed lower drilling tool frictional resistance; This drilling fluid system has anti-preferably salt crystallization and drilling equipment corrosion inhibition simultaneously.
For guaranteeing that drilling fluid has the good lithology of taking; And equilibrium strata pressure, when drilling fluid density is not enough, can cooperate the adding heavy weight additive in the above-mentioned steps (1).
For reducing the corrosion of salt pair drilling tool and recycle unit, all can in drilling fluid, add corrosion inhibiter before and after the above-mentioned arbitrary steps.
The specific embodiment
When carrying out the salt prunella mine drilling well, earlier beat peupendicular hole section and lower curved section according to a conventional method, and then the horizontal well section of fetching water, in this process, treated drilling fluid according to the following steps:
(1), drilling tool enters before sal prunella ore bed or the glauberite layer on it, in drilling fluid magma, add NaCl (sodium chloride) and improve Cl
-Content (reaching more than 170,000 ppm) and drilling fluid density are converted into saturated brine until drilling fluid; When drilling fluid density is not enough, can cooperate the adding heavy weight additive.
(2), in drilling fluid, add CMS (CMS), CMC (carboxymethyl cellulose) or anti-salt filtrate loss reduction additive and reduce the drilling fluid fluid loss;
(3), add NaHm (sodium humate), anti-collapse dose or anti-collapse dose of improvement of mud cake of salt-resisting high-temperature-resisting and maintenance hole stability;
(4), add XPJ (defoamer) froth breaking;
(5), add oily lubricant or water base lubricant and improve the drilling fluid lubricating ability and reduce the drilling tool frictional resistance, guarantee creeping into pressurization and pull out of hole and promoting smoothly of drilling tool; This sliding agent can be a small amount of crude oil, also can adopt polymeric alcohol.
(6), add a certain amount of anti-salt crystallizing agent and stop salt crystallization and harm of causing when temperature reduces.
Above-mentioned steps can be handled in proper order not according to it, can add the corrosion that corrosion inhibiter reduces salt pair drilling tool and recycle unit before and after above-mentioned arbitrary step.
Claims (3)
1, the processing method of drilling fluid in a kind of salt prunella mine horizontal well drilling process may further comprise the steps:
(1), drilling tool enters before sal prunella ore bed or the glauberite layer on it adding NaCl raising Cl in drilling fluid magma
-Content and drilling fluid density are converted into saturated brine until drilling fluid;
(2), in drilling fluid, add CMS, CMC or anti-salt filtrate loss reduction additive and reduce the drilling fluid fluid loss;
(3), add NaHm, anti-collapse dose or anti-collapse dose of improvement of mud cake of salt-resisting high-temperature-resisting and maintenance hole stability;
(4), add the XPJ froth breaking;
(5), add oily lubricant or water base lubricant and improve the drilling fluid lubricating ability and reduce the drilling tool frictional resistance, guarantee creeping into pressurization and pull out of hole and promoting smoothly of drilling tool;
(6), add a certain amount of anti-salt crystallizing agent and stop salt crystallization when temperature reduces.
2, the processing method of drilling fluid in the salt prunella mine horizontal well drilling process according to claim 1 is characterized in that: in above-mentioned steps (1), adding heavy weight additive increases drilling fluid density.
3, the processing method of drilling fluid in the salt prunella mine horizontal well drilling process according to claim 1 and 2 is characterized in that: add the corrosion that corrosion inhibiter reduces salt pair drilling tool and recycle unit before or after described arbitrary step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510038086 CN1670330A (en) | 2005-03-11 | 2005-03-11 | Treatment method of drilling fluid in sal prunella mine lateral well drilling process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510038086 CN1670330A (en) | 2005-03-11 | 2005-03-11 | Treatment method of drilling fluid in sal prunella mine lateral well drilling process |
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| CN1670330A true CN1670330A (en) | 2005-09-21 |
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| CN 200510038086 Pending CN1670330A (en) | 2005-03-11 | 2005-03-11 | Treatment method of drilling fluid in sal prunella mine lateral well drilling process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942294A (en) * | 2010-07-27 | 2011-01-12 | 中国石油大学(北京) | Offshore drilling fluid system and preparation method thereof |
| CN107575171A (en) * | 2017-10-21 | 2018-01-12 | 中国石油集团渤海钻探工程有限公司 | A kind of drilling rod and its application method for salt-water drilling fluid |
| CN111621277A (en) * | 2020-05-13 | 2020-09-04 | 中国石油天然气集团有限公司 | Treatment method for oil-based drilling fluid to crystallize and separate out salt in high-salt stratum |
-
2005
- 2005-03-11 CN CN 200510038086 patent/CN1670330A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942294A (en) * | 2010-07-27 | 2011-01-12 | 中国石油大学(北京) | Offshore drilling fluid system and preparation method thereof |
| CN101942294B (en) * | 2010-07-27 | 2013-05-01 | 中国石油大学(北京) | Offshore drilling fluid system and preparation method thereof |
| CN107575171A (en) * | 2017-10-21 | 2018-01-12 | 中国石油集团渤海钻探工程有限公司 | A kind of drilling rod and its application method for salt-water drilling fluid |
| CN111621277A (en) * | 2020-05-13 | 2020-09-04 | 中国石油天然气集团有限公司 | Treatment method for oil-based drilling fluid to crystallize and separate out salt in high-salt stratum |
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