CN104045271B - A kind of sealing agent for oil field or natural gas extraction and preparation method thereof - Google Patents
A kind of sealing agent for oil field or natural gas extraction and preparation method thereof Download PDFInfo
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- CN104045271B CN104045271B CN201310083829.8A CN201310083829A CN104045271B CN 104045271 B CN104045271 B CN 104045271B CN 201310083829 A CN201310083829 A CN 201310083829A CN 104045271 B CN104045271 B CN 104045271B
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Abstract
The invention provides a kind of sealing agent for oil field or natural gas extraction, it belongs to chemical consolidation sealing agent, and described sealing agent comprises cement or lime, slag, bentonite, gypsum and acidic materials. Chemical consolidation sealing agent provided by the invention can work in the subsurface environment of 50～150 DEG C, has good compatibility with drilling fluid, without serious multiviscosisty phenomenon; And this chemical consolidation sealing agent is nontoxic, tasteless, there is no corrosivity, environmentally safe. More than its intensity can reach 10MPa in 24 hours, more than within 48 hours, can reaching 17MPa, can increase substantially the bearing capacity of lost-circulation zone, effectively shutoff crack, cave leakage layer, ensure normally carrying out of follow-up drillng operation. This sealing agent has obtained successful Application in the fractured leakage layer of TH12355, TP243X, S115-4 and the SX2 well 3709～5535m of system in Tahe Oilfield, and the bearing capacity of lost-circulation zone improves 8～12MPa.
Description
Technical field
The invention belongs to sealing agent used in oil or gas drilling process, be specifically related to a kind of for oil field or natural gasSealing agent of exploitation and preparation method thereof.
Background technology
Along with the development of petroleum industry, oil-gas exploration and development deepens continuously, and the stratum running in drilling process becomes increasingly complex,On drilling pressure exhaustion stratum, fragmentation or weak consolidated formation, fracture development stratum and while overlapping pressure series of strata etc. more, leakage problemVery outstanding. Leakage not only expends drilling time, loss drilling fluid, and likely cause bit freezing, blowout, borehole well instabilityDeng series of problems.
The leakage causing for crack and hole, mainly adopts bridge joint loss circulation material and chemical plugging material. Wherein, for groundThe hole that slabbing seam is indefinite or large, main method of attempting with bridge blinding, seals by groping gradually strata condition at presentStifled lost-circulation zone. In the time utilizing bridge joint blocking method, if inaccurate to strata condition judgement, often need to adjust grain composition,Could block lost-circulation zone completely through leak stopping repeatedly. Chemical plugging material refers to polymer and polymer-inorganic glue condensateMatter is basic leak stopping inorganic agent, and chemical plugging material is broadly divided into three types: the one, and macromolecular compound sealing agent;The 2nd, the sealing agent that inorganic gel material and macromolecular compound mix; The 3rd, add various curing agent taking mud as basisThe leak stopping system forming. Chemical plugging serum density is lower, and setting time adjusting range is large, and the diafiltration ability of slurries is stronger,Filtrate also can be solidified, but temperature tolerance is poor, is not suitable for the blocking construction of deep formation or high-temperature stratum. In addition, chemistryLoss circulation material ubiquity is expensive, and construction, preparation are complicated, the shortcoming that use cost is higher, therefore, to a certain degreeOn hindered the development of chemical plugging material.
In CN200810249847.8, mention a kind of fixed oil sediment of consolidating agent that utilizes and fix the sand the method for water plugging and profile controlling, fullyUtilize the discarded object oil sediment of output in oil extraction in oil field process, add modifier, consolidating agent, fixed accelerator or fixed delayingAgent, is made into suspension and injects place in debt, stratum, fixed under ground environment, reaches to fix the sand the object of water plugging and profile controlling. This inventionConsider the impact of consolidation time on construction safety, but do not considered asking of the easy layering of suspension and fixed rear fixed thing contractionTopic, layering meeting affects consolidation strength, and fixed thing contraction can cause the production in debt crack of filling, water plugging and profile controlling deleterious.Adopt envelope operation slurry and using method thereof and mention a kind of oil gas field in CN201210056138.4, suspension has been considered in this inventionThe easy layering of liquid affects the factor of construction effect, has introduced set retarder and suspending agent on the basis of traditional slurry, has improved slurryThe effect that mends a split of material, but do not take into full account equally the contraction problem of slurry after fixed.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the present invention has taken into full account sedimentation layering, the contraction of fixed rear fixed thing, thixotropingThe performances such as property and multiviscosisty consolidation time, have introduced the material of corresponding coupling, and the fixed slurry of preparation is easy to be trapped in crack, GuKnot after form fixed thing intensity high, do not shrink, construction safety, plugging effect is good.
More complicated for chemical plugging construction technology, temperature tolerance is poor, is unsuitable for the situation of deep-well and high temperature well; Essence of the present inventionSelect various can reacting to each other to generate the material of fixed thing, form chemical consolidation sealing agent, its thickening time can execute according to sceneWork situation regulates, and can meet the shutoff requirement on different temperatures stratum, simplifies construction technology, solution high temperature crack, deep,The pernicious leakage problem on solution cavity stratum.
Therefore, the invention provides a kind of sealing agent for oil field or natural gas extraction, described sealing agent comprise cement or lime,Slag, bentonite, gypsum and acidic materials.
Preferably, described sealing agent is made up of cement or lime, slag, bentonite, gypsum and acidic materials. The present inventionIn, the feature of utilizing slag to be activated by alkaline matter, not adding specially under the condition of alkaline matter, utilizes oil wellThe alkalescence of cement or lime activates slag, makes the fixed thing shutoff of its fixed formation lost-circulation zone, adds anti-settling and anti-receipts simultaneouslyThe bentonite of contracting, increases thixotropic gypsum, and utilizes acidic materials to control the thickening time of sealing agent, final formationizationLearn fixed sealing agent. Above-mentioned chemical consolidation sealing agent is added in clear water, is mixed with chemical consolidation leak stopping slurry, inject lost-circulation zone,Can reach the object of shutoff lost-circulation zone.
More preferably, between described cement or lime, slag, bentonite, gypsum and acidic materials, ratio of quality and the number of copies is 4～10:8～20：1～2：1～3：0.2～1。
In concrete embodiment of the present invention, described acidic materials are hydrochloric acid and/or HEDP. Preferably,Described slag is the slag of granularity below 100 μ m.
The present invention also provides a kind of preparation method of the above-mentioned sealing agent for oil field or natural gas extraction, comprising: by acidMatter is put into running water, stirs; Cement or lime, slag, bentonite and gypsum are put into mixer to stirAnd add in running water; The density that preparation obtains is 1.2～2.0g/cm3Solution be sealing agent.
Along with oil drilling is to darker more the carrying out of bad ground, boring the leakage of meeting can get more and more, and is badly in need of effective shutoff materialMaterial and leakage stopping technology solve leakage problem, shorten drilling period, improve exploration and development speed. Sealing agent provided by the inventionEffectively shutoff crack, cave leakage, solves the pernicious leakage problem occurring in Process of Oil Well Drilling.
Detailed description of the invention
The cement using in the present invention is good magnificent G class g cement or cement for building; Slag used is blast-furnace cinder; Gypsum usedFor commercially available dihydrate gypsum; Used salt acid concentration 0.1mol/L. Laboratory apparatus used comprises OWC-9390(B) type supercharging supportProtect still, YAW-300B type pressure testing machine and the fast rotation viscometer of ZNN-D6 type six.
Embodiment 1
The HEDP of 0.2 weight portion is put into running water, stir; By 52.5 type silicic acid of 5 weight portionsThin slag, the bentonite of 1 weight portion and the two water stones of 1 weight portion of the granularity of salt cement, 11 weight portions below 50 μ mCream is put into mixer and is stirred, and adds in running water; Being mixed with density is 1.3g/cm3Solution; Put into supercharging maintenanceIn still, be warming up to 60 DEG C, be forced into 35MPa, maintenance 24 hours; After taking-up, on forcing press, test intensity, its intensityFor 10.5MPa.
Embodiment 2
The hydrochloric acid of 0.25 weight portion is put into running water, stir; By 52.5 type portland cements of 8 weight portions,Thin slag, the bentonite of 1.5 weight portions and the dihydrate gypsum of 1.5 weight portions of the granularity of 15 weight portions below 50 μ m put intoIn mixer, stir, add in running water; Being mixed with density is 1.45g/cm3Solution; Put into supercharging curing autoclave,Be warming up to 70 DEG C, be forced into 45MPa, maintenance 24 hours; After taking-up, on forcing press, test intensity, its intensity is 11MPa.
Embodiment 3
The HEDP of 0.3 weight portion is put into running water, stir; By the good magnificent G level water of 5 weight portionsThin slag, the bentonite of 1 weight portion and the dihydrate gypsum of 1 weight portion of the granularity of mud, 10 weight portions below 50 μ m putEnter in mixer and stir, add in running water; Being mixed with density is 1.65g/cm3Solution; Put into supercharging curing autoclaveIn, be warming up to 100 DEG C, be forced into 55MPa, maintenance 24 hours; After taking-up, on forcing press, test intensity, its intensity is10.8MPa。
Embodiment 4
The HEDP of 0.4 weight portion is put into running water, stir; By the good magnificent G level water of 8 weight portionsThin slag, the bentonite of 1.6 weight portions and the dihydrate gypsum of 2 weight portions of the granularity of mud, 15 weight portions below 50 μ mPut into mixer and stir, add in running water; Being mixed with density is 1.75g/cm3Solution; Put into supercharging maintenanceIn still, be warming up to 110 DEG C, be forced into 65MPa, maintenance 24 hours; After taking-up, on forcing press, test intensity, its intensityFor 11.3MPa.
Embodiment 5
The hydrochloric acid of 0.45 weight portion is put into running water, stir; By good magnificent G class g cement, 18 weights of 10 weight portionsThin slag, the bentonite of 2 weight portions and the dihydrate gypsum of 2.5 weight portions of the granularity of amount part below 50 μ m put into mixerIn stir, add in running water; Being mixed with density is 1.85g/cm3Solution; Put into supercharging curing autoclave, heat upTo 120 DEG C, be forced into 70MPa, maintenance 24 hours; After taking-up, on forcing press, test intensity, its intensity is 11.8MPa.
Embodiment 6
The HEDP of 0.35 weight portion is put into running water, stir; By the lime of 6 weight portions, 18Thin slag, the bentonite of 2 weight portions and the dihydrate gypsum of 2.5 weight portions of the granularity of weight portion below 50 μ m put into stirringIn machine, stir, add in running water; Being mixed with density is 1.70g/cm3Solution; Put into supercharging curing autoclave, riseTemperature, to 100 DEG C, is forced into 50MPa, maintenance 24 hours; After taking-up, on forcing press, test intensity, its intensity is 10.5MPa.
Comparative example 1
The filtrate loss reduction additive of the set retarder of 0.35 weight portion and 0.3 weight portion is added in running water, stir; By 10 weightsThe good magnificent G class g cement of amount part and the flyash of 14 weight portions are put into mixer and are stirred, and add in running water; PreparationBecome density 1.65g/cm3Solution, put into supercharging curing autoclave, heat to 100 DEG C, be forced into 55MPa, maintenance 24 is littleTime; After taking-up, on forcing press, test intensity, its intensity is 7.8MPa.
Comparative example 2
The filtrate loss reduction additive of the set retarder of 0.4 weight portion and 0.3 weight portion is added in running water, stir; By 10 weightThe good magnificent G class g cement of part and the flyash of 8 weight portions are put into mixer and are stirred, and add in running water; Be mixed with closeDegree 1.5g/cm3Solution, put into supercharging curing autoclave, heat to 110 DEG C, be forced into 65MPa, maintenance 24 hours; GetAfter going out, on forcing press, test intensity, its intensity is 8.9MPa.
By corresponding the sealing agent in embodiment 1～6 and comparative example 1～2 rotation viscometer reading, sealing agent curing condition and leak stoppingSlurry intensity of gained material after maintenance is listed in table 1.
Table 1
As can be seen from Table 1, in the present invention, the rotation viscometer reading of chemical consolidation sealing agent is less than low close in comparative exampleDegree cement mortar, shows that its rheological characteristic is better than low-density cement mortar, and leak stopping slurry is easy to enter little leakage channel, reaches betterPlugging effect; And under identical curing condition, the intensity of chemical consolidation sealing agent firming body will be higher than low-density cement mortar,Show that its bearing capacity will be higher than low-density cement mortar, can bear higher leakage pressure reduction.
Chemical consolidation sealing agent provided by the invention can work in the subsurface environment of 50～150 DEG C, has good with drilling fluidCompatibility, without serious multiviscosisty phenomenon; And this chemical consolidation sealing agent is nontoxic, tasteless, there is no corrosivity, environmentally safe.More than its intensity can reach 10MPa in 24 hours, more than within 48 hours, 17MPa can being reached, can increase substantially lost-circulation zoneBearing capacity, effectively shutoff crack, cave leakage layer, ensure normally carrying out of follow-up drillng operation. This sealing agent existsIn the fractured leakage layer of TH12355, TP243X, S115-4 and the SX2 well 3709～5535m of system in Tahe Oilfield, obtainSuccessful Application, the bearing capacity of lost-circulation zone improves 8～12MPa.
Claims (3)
1. for a sealing agent for oil field or natural gas extraction, described sealing agent is by cement or lime, slag, bentonite, gypsumForm with acidic materials; Between described cement or lime, slag, bentonite, gypsum and acidic materials ratio of quality and the number of copies be 4～10:8～20:1～2:1～3:0.2～1; Described acidic materials are hydrochloric acid and/or HEDP.
2. sealing agent according to claim 1, is characterized in that, described slag is the slag of granularity below 100 μ m.
3. according to a preparation method for sealing agent described in claim 1 or 2, comprising: acidic materials are put into running water, stirMix evenly; Cement or lime, slag, bentonite and gypsum are put into mixer to stir and adds running water; JoinThe density making is 1.2～2.0g/cm3Solution be sealing agent.
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| CN201310083829.8A CN104045271B (en) | 2013-03-15 | 2013-03-15 | A kind of sealing agent for oil field or natural gas extraction and preparation method thereof |
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| CN104045271A CN104045271A (en) | 2014-09-17 |
| CN104045271B true CN104045271B (en) | 2016-05-11 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106278068B (en) * | 2016-08-24 | 2018-08-21 | 钟原 | A kind of sealing agent used for geological prospecting and preparation method thereof |
| CN111320973A (en) * | 2020-03-30 | 2020-06-23 | 天津萨恩斯石油技术有限公司 | High-temperature-resistant high-pressure-bearing polymer drilling plugging material and preparation method thereof |
| CN111577197B (en) * | 2020-05-28 | 2022-04-29 | 中国石油集团渤海钻探工程有限公司 | Quick plugging method suitable for temperature of lost stratum being more than or equal to 80 DEG C |
| CN114075065B (en) * | 2020-08-11 | 2022-11-29 | 中国石油化工股份有限公司 | Chemical wall-fixing agent for fractured formation, preparation method and application thereof, and advanced injection construction method |
| CN112209678A (en) * | 2020-09-29 | 2021-01-12 | 中曼石油天然气集团股份有限公司 | Drilling fluid rapid dehydration pressure-bearing plugging agent, preparation method thereof and pressure-bearing plugging slurry |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1757697A (en) * | 2005-11-07 | 2006-04-12 | 刘茂平 | Seal stoppage agent for oil-well |
| CN102093863A (en) * | 2011-01-18 | 2011-06-15 | 大庆石油管理局 | Ultra-fine cement slurry for blocking |
| CN102443383A (en) * | 2011-09-06 | 2012-05-09 | 中国石油天然气集团公司 | High-dehydration hardenable plugging sealing agent |
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- 2013-03-15 CN CN201310083829.8A patent/CN104045271B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1757697A (en) * | 2005-11-07 | 2006-04-12 | 刘茂平 | Seal stoppage agent for oil-well |
| CN102093863A (en) * | 2011-01-18 | 2011-06-15 | 大庆石油管理局 | Ultra-fine cement slurry for blocking |
| CN102443383A (en) * | 2011-09-06 | 2012-05-09 | 中国石油天然气集团公司 | High-dehydration hardenable plugging sealing agent |
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