CN103571447A - Self-cleaning temporary plugging agent for drilling fluid and preparation method of self-cleaning temporary plugging agent - Google Patents
Self-cleaning temporary plugging agent for drilling fluid and preparation method of self-cleaning temporary plugging agent Download PDFInfo
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- CN103571447A CN103571447A CN201210273967.8A CN201210273967A CN103571447A CN 103571447 A CN103571447 A CN 103571447A CN 201210273967 A CN201210273967 A CN 201210273967A CN 103571447 A CN103571447 A CN 103571447A
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- temporary plugging
- plugging agent
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- drilling fluid
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/032—Inorganic additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a self-cleaning temporary plugging agent for drilling fluid and belongs to a treatment agent for the drilling fluid. The invention provides a temporary plugging agent which can be automatically cleaned in a period of time after construction aiming at the defects that an existing temporary plugging agent is needed to be acidized and removed or a field construction process is complex. The self-cleaning temporary plugging agent disclosed by the invention consists of a bridging material, a filling material and a delay mud cake cleaning agent, wherein the delay mud cake cleaning agent is dissolved under downhole conditions, and the used bridging material and filling material are gradually dissolved. The filter cake structure is damaged, and an effect of removing the filter cake is achieved.
Description
Technical field
The present invention relates to a kind of drilling fluid treatment agent technical field, relate in particular to a kind of can self-purging temporary plugging agent for drilling fluid and preparation method.
Background technology
In drilling operation, when fluid column pressure is higher than sand pressure in pit shaft, can cause drilling fluid leakage in various degree, drilling fluid filtrate is invaded oil reservoir, can bring injury to oil reservoir.At present; temporary shielding method ,barrier building temporary seal incores is a kind of reservoir protection measure the most frequently used in drilling process; in drilling process, temporarily add a certain proportion of temporary plugging agent; by the bridge formation filling effect of bridge particle, particle filled composite and changeable type particle; at Around A Borehole, form a shield-temporary plugging layer that rate of permeation is low artificially, stop solid phase and filtrate in drilling fluid to invade oil reservoir.After drilling operation finishes, remove its plugging action, the virgin state of renwing stratum.
Temporary plugging agent for drilling fluid is a kind for the treatment of agent of stifled effect temporarily that plays using in drilling process, can be divided into solubility in acid temporary plugging agent and oil-soluble temporary plugging agent.
Early stage drilling well temporary plugging agent is solubility in acid temporary plugging agent.In drilling process, in drilling fluid, add the molten particulate material of inorganic theobromine, by grain size distribution, realize stifled object temporarily.After drilling operation finishes, by acidifying, remove shutoff.The calcium carbonate-base filter cake that common acid dissolubility temporary plugging agent forms can be combined removing by acid, oxygenant and other treatment process.But solubility in acid temporary plugging agent exists de-plugging process complexity and easily pollutes the deficiencies such as stratum.This class temporary plugging agent can only pass through the measure de-pluggings such as perforation, acidifying.If for acid sensitivity stratum, take acidifying measure, strong acid can dissolve stratum matrix, can produce new particle contamination, and these particle migrations cause bridging plug, have limited production capacity, and Ca in this class temporary plugging agent
2+produce precipitation with mineral ion in stratum, pollute stratum.
Another kind of temporary plugging agent is oil-soluble temporary plugging agent.This class temporary plugging agent is by introducing the macromolecular material of Identification of Soluble Organic, and in drilling process, under the effect of well temperature, softening macromolecular material, forms fine and close plugged zone on order stratum, effectively protects oil reservoir.When oil producing operation is implemented, due to the effect of crude oil, dissolve gradually plugged zone, reach the object of de-plugging.Yet oil-soluble temporary plugging agent exists site technique complicated, is unfavorable for the shortcomings such as on-the-spot drilling operation.
Summary of the invention
The deficiency existing for current temporary plugging agent for drilling fluid, the invention provides self-cleaning temporary plugging agent and preparation method for a kind of drilling fluid, this temporary plugging agent is particularly suitable for acid-sensitive stratum, has avoided the situation due to acidizing treatment injury reservoir, easy to use, reduced cost.
The technical solution used in the present invention: drilling fluid with self-cleaning temporary plugging agent by the bridging materials of 50%-60%, the packing material of 20%-30% and the agent of 10%-20% time delay mud cake removal form, wherein, one or more in several different grain size magnesium oxide, heavy-calcined magnesia, activated magnesia of bridging materials form, the general character with basic oxide, belong to gelling material, water insoluble, be dissolved in acid and ammonium salt; One or more in Magnesium peroxide, magnesiumcarbonate, magnesium basic carbonate of packing material form, water insoluble or be slightly soluble in water, and the aqueous solution is weakly alkaline, is soluble in acid and ammonium salt solution, and this packing material is conducive to form fast densification and the mud cake of flexible; The agent of time delay mud cake removal, main component is ammonium salt, can slowly dissolve bridge formation particle, thereby destroys filter cake texture, reaches the effect of self-cleaning filter cake.
In technical scheme of the present invention, the size-grade distribution of bridging materials is 60-200 order, wherein the mass percent of 60-100 order (not containing 100) is 20-30%, and 100-150 object mass percent is 30-50%, and the mass percent of 150-200 order (not containing 150) is 20-40%.By varigrained magnesium oxide, carry out proportioning, be more conducive to make it to play bridging action.Magnesium oxide particle is water insoluble, yet this particle is soluble in ammonium salt.
The preparation method of self-cleaning temporary plugging agent:
(1) in mixing kettle, according to grain size proportion, add bridging materials, stir 30-60 minute;
(2) add packing material, stir 30-60 minute;
(3) add the agent of time delay mud cake removal, stir after 30-60 minute, obtain this product.
Advantage of the present invention is: temporary plugging agent of the present invention enters behind stratum with drilling fluid, under the effect of positive pressure differential, multi-stage oxidizing magnesium can form densification and the mud cake of flexible at Around A Borehole, the rate of permeation on nearly borehole wall stratum is reduced rapidly, can prevent drilling fluid filtrate in drilling process and various treatment agent, landwaste invaded formation and cause that oil and gas production reduces and production capacity reduces.The mud cake removal agent that simultaneously contains time delay in temporary plugging agent of the present invention, is not being used under sour prerequisite, and the scavenging agent of ammonium salt-containing just can dissolve bridge formation particle, destroys filter cake texture.This temporary plugging agent has the advantages that time delay is removed mud cake, can realize after temporary plugging agent arrives design attitude completely and just start to react with filter cake, until remove completely, solved the conventional deficiency that adopts acid, enzyme, oxygenant cannot effectively remove filter cake, be particularly suitable for carrying out the acid-sensitive stratum of acidizing treatment, easy to use, save cost.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described, but be not limited to following examples.Wherein in embodiment, one or more in magnesium oxide, heavy-calcined magnesia, activated magnesia of bridging materials used form; One or more in Magnesium peroxide, magnesiumcarbonate, magnesium basic carbonate of packing material form; The agent of time delay mud cake removal is a kind of in ammonium chloride or potassium sodium citrate ammonium salt.The size-grade distribution of bridging materials is preferably 60-200 order, and concrete proportioning is: < 100 object mass percents are 20-30%; 100-150 object mass percent is 30-50%; > 150 object mass percents are 20-40%.
Embodiment 1
(1) bridging materials mix and blend 30-60 minute in reactor of temporary plugging agent gross weight 50% will be accounted for;
(2) add the packing material that accounts for temporary plugging agent gross weight 30%, stir 30-60 minute;
(3) add the time delay mud cake removal agent that accounts for temporary plugging agent gross weight 20%, stir 30-60 minute, stir and obtain product.
Embodiment 2
(1) bridging materials mix and blend 30-60 minute in reactor of temporary plugging agent gross weight 60% will be accounted for;
(2) add the packing material that accounts for temporary plugging agent gross weight 20%, stir 30-60 minute;
(3) add the time delay mud cake removal agent that accounts for temporary plugging agent gross weight 20%, stir 30-60 minute, stir and obtain product.
Below by concrete performance, further illustrate effect of the present invention:
Peaceful flat 1 well location, in Ning Dong17 wellblock, Ning Dong oil field, is Ning Dong oil field first horizontal well.According to peaceful eastern 17 well rock core sensitization test data, show, Ning Dong17 wellblock, Ning Dong oil field reservoir is that medium water-sensitive on the weak side, weak base are quick, the quick reservoir of nothing quick, the middle isogonic strong acid of speed.This reservoir water saturation is high, and formation water salinity is high, and calcium ion is many, meets the drilling fluid filtrate that contains sulfate radical and very easily generates calcium sulfate precipitation, runs into and contains a large amount of carbanions and the higher reservoir of PH, easily produces a large amount of precipitation of calcium carbonate.Effectively reservoir protection measure is to adopt Shielding Temporary Plugging Technology.But this block formation heterogeneity is strong, so if use traditional temporary shielding method ,barrier building temporary seal incores, effect will be very poor.
Free clay phase drilling fluid system is used in peaceful flat 1 well three exploitations, and temporary plugging agent is selected the produced according to the invention temporary plugging agent removed that is applicable to acid sensitivity reservoir.This well circulation of drilling fluid amount amounts to 200 sides, and when 2200 meters of well depths, gradation adds 6 tons of temporary plugging agents removed that are applicable to acid sensitivity stratum.In this temporary plugging agent, contain the mud cake removal agent of time delay, can not use under sour prerequisite, the scavenging agent of containing ammonium chloride just can dissolve bridging particle and other components of drilling liquid.This temporary plugging agent has time delay; can realize after temporary plugging agent arrives design attitude completely and just start to react with filter cake; until remove completely; solved the conventional deficiency that adopts acid, enzyme, oxygenant cannot effectively remove filter cake; thereby avoided because acidizing treatment produces precipitation; pollute the generation of strata condition, more effectively protected reservoir.15 tons of this well formation testing daily outputs, far above the mean level (ML) of 2～3 tons of offset wells.
Peaceful flat 2 well locations, in Ning Dong17 wellblock, Ning Dong oil field, are second mouthful, Ning Dong oil field water horizontal wells.Cheng Zuan， Drilling Tech. Inst., Shengli Petroleum Administration of this Jing Yousanpu 50791HB drill crew oiling is born three spudding well liquid and well finishing liquid construction task.Ning Dong17 wellblock, Ning Dong oil field reservoir is that medium water-sensitive on the weak side, weak base are quick, the quick reservoir of nothing quick, the middle isogonic strong acid of speed.
Peaceful flat 2 wells three are opened same employing free clay phase drilling fluid system, and temporary plugging agent is selected the produced according to the invention temporary plugging agent removed that is applicable to acid sensitivity stratum.This well circulation of drilling fluid amount amounts to 220 sides, is entering first 200 meters of oil reservoir, and when well depth is 2328 meters, gradation adds 6 tons of time delay temporary plugging agents.In this temporary plugging agent, contain the mud cake removal agent of time delay, can not use under sour prerequisite, the scavenging agent of containing ammonium chloride just can dissolve bridging particle and other components of drilling liquid.This temporary plugging agent has time delay; can realize after temporary plugging agent arrives design attitude completely and just start to react with filter cake; until remove completely; solved the conventional deficiency that adopts acid, enzyme, oxygenant cannot not effectively remove filter cake; thereby avoided because acidizing treatment produces precipitation; pollute the generation of strata condition, more effectively protected 17 tons of this well of reservoir formation testing daily outputs, far above the mean level (ML) of 2～3 tons of offset wells.
Claims (4)
1. a drilling fluid self-cleaning temporary plugging agent, is characterized in that: described self-cleaning temporary plugging agent forms by having the bridging materials of the basic oxide general character, water-fast packing material and the agent of time delay mud cake removal, and each constituent mass per-cent is:
A. bridging materials: 50-60%;
B. packing material: 20-30%;
C. time delay mud cake removal agent: 10-20%.
2. drilling fluid according to claim 1 self-cleaning temporary plugging agent, is characterized in that: one or more in magnesium oxide, heavy-calcined magnesia, activated magnesia of described bridging materials form; One or more in Magnesium peroxide, magnesiumcarbonate, magnesium basic carbonate of described packing material form; The agent of described time delay mud cake removal is a kind of in ammonium chloride or potassium sodium citrate ammonium salt.
3. drilling fluid according to claim 1 and 2 self-cleaning temporary plugging agent, is characterized in that: the size-grade distribution of described bridging materials is 60-200 order, and concrete proportioning is:
A. < 100 object mass percents are 20-30%;
B.100-150 object mass percent is 30-50%;
C. > 150 object mass percents are 20-40%.
4. produce a preparation method for self-cleaning temporary plugging agent for drilling fluid described in the arbitrary claim of 1-3, it is characterized in that:
(1) in mixing kettle, according to grain size proportion, add bridging materials, stir 30-60 minute;
(2) add packing material, stir 30-60 minute;
(3) add the agent of time delay mud cake removal, stir after 30-60 minute, obtain this product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210273967.8A CN103571447A (en) | 2012-08-03 | 2012-08-03 | Self-cleaning temporary plugging agent for drilling fluid and preparation method of self-cleaning temporary plugging agent |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210273967.8A CN103571447A (en) | 2012-08-03 | 2012-08-03 | Self-cleaning temporary plugging agent for drilling fluid and preparation method of self-cleaning temporary plugging agent |
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| CN103571447A true CN103571447A (en) | 2014-02-12 |
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| CN201210273967.8A Pending CN103571447A (en) | 2012-08-03 | 2012-08-03 | Self-cleaning temporary plugging agent for drilling fluid and preparation method of self-cleaning temporary plugging agent |
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Citations (6)
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|---|---|---|---|---|
| CN1288036A (en) * | 1999-09-15 | 2001-03-21 | 辽河石油勘探局钻采工艺研究院 | High temp. temporary plugging agent and its prepn. method |
| CN1432620A (en) * | 2002-01-14 | 2003-07-30 | 中国石油化工股份有限公司 | Temporary leakage-stopping agent for well drilling shielding and its application |
| WO2005095538A1 (en) * | 2004-03-27 | 2005-10-13 | Cleansorb Limited | Process for disruption of filter cakes |
| CN102344788A (en) * | 2010-11-18 | 2012-02-08 | 中国石油天然气股份有限公司 | Temporary plugging agent for horizontal well staged fracturing with controllable gel breaking and preparation method thereof |
| CN102604627A (en) * | 2011-10-26 | 2012-07-25 | 中国石油化工股份有限公司 | Acid fracturing temporary plugging agent |
| CN102618234A (en) * | 2011-03-30 | 2012-08-01 | 中国石油化工集团公司 | High sulfur-containing gas well gas testing commissioning operation temporary plugging agent |
-
2012
- 2012-08-03 CN CN201210273967.8A patent/CN103571447A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288036A (en) * | 1999-09-15 | 2001-03-21 | 辽河石油勘探局钻采工艺研究院 | High temp. temporary plugging agent and its prepn. method |
| CN1432620A (en) * | 2002-01-14 | 2003-07-30 | 中国石油化工股份有限公司 | Temporary leakage-stopping agent for well drilling shielding and its application |
| WO2005095538A1 (en) * | 2004-03-27 | 2005-10-13 | Cleansorb Limited | Process for disruption of filter cakes |
| GB2448840A (en) * | 2004-03-27 | 2008-10-29 | Cleansorb Ltd | Drilling fluid having a bridging agent and solid hydrolysable solid polymers |
| CN102344788A (en) * | 2010-11-18 | 2012-02-08 | 中国石油天然气股份有限公司 | Temporary plugging agent for horizontal well staged fracturing with controllable gel breaking and preparation method thereof |
| CN102618234A (en) * | 2011-03-30 | 2012-08-01 | 中国石油化工集团公司 | High sulfur-containing gas well gas testing commissioning operation temporary plugging agent |
| CN102604627A (en) * | 2011-10-26 | 2012-07-25 | 中国石油化工股份有限公司 | Acid fracturing temporary plugging agent |
Non-Patent Citations (1)
| Title |
|---|
| 刘大伟等: "保护碳酸盐岩储层屏蔽暂堵技术研究进展", 《钻井液与完井液》 * |
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Application publication date: 20140212 |