CN102443383B - High-dehydration hardenable plugging sealing agent - Google Patents
High-dehydration hardenable plugging sealing agent Download PDFInfo
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Abstract
The invention relates to a high-dehydration hardenable plugging sealing agent which comprises the following components by mass percent: 35-50% of solidifying material, 25-35% of composite sealing agent, 5-15% of high-dehydration material, 5-10% of elastic expending material and 10-15% of fiber material, wherein the composite sealing agent is formed by mixing granular husk, mica and cotton seed hull in a mass ratio of 5:2:1; the solidifying material is formed by mixing gypsum, cement, blast furnace slag and sodium phosphate in a mass ratio of 1:1:0.5:0.1; the high-dehydration material is kieselguhr or coal ash; the elastic expending material is formed by mixing coated water-sucking rubber and coated water-sucking resin in a mass ratio of 1:1; and the fiber material is polyacrylonitrile fiber of 9-11mm. The sealing agent integrates with high dehydration, delay expanding, plugging solidification and physical overlap joint; and the formed sealing layer is not easy to destroy in the subsequent drilling process, thereby effectively improving the sealing efficiency.
Description
Technical field
The present invention relates to the used a kind of auxiliary agent in oil drilling field, particularly a kind of high dehydration, can harden, become the plug plugging agent.
Background technology
Leakage be a kind of in drilling process drilling fluid, grout or other working fluids miss phenomenon in the stratum.The generation of leakage not only can expend rig time, the loss drilling fluid, and may cause the series of complex situations such as bit freezing, blowout, well slough, and can cause well to be scrapped when serious, cause great financial loss.
Patching materials commonly used mainly is divided into physics patching materials and chemical plugging material at present: the physics patching materials mainly contains bridge joint patching materials and high dehydration patching materials.Bridge joint patching materials Main Basis grain composition principle, use the nut-shell, sheet mica, rice husk, cotton seed hulls, sawdust etc. of varying particle sizes to carry out for different Size of Cracks composite, thus the shutoff drop ply.Its main drawback be when underground crack openings size be difficult to judge or bore hole leakage section longer, and when having various ways crack or hole, the plugging agent grain diameter is difficult to rational Match with leakage stratum pore throat diameter, does not have effective leak stopping effect.High dehydration patching materials mainly is formulated by paper scrap, diatomite, lime etc., rapidly dehydration under differential pressure action, and the solid components in the slurries is assembled, retrogradation forms filter cake, then compacting, filling leakage channel; If leakage channel is larger, a certain proportion of particulate inert material that then is mixed in plugging agent utilizes bridging action that the leakage channel cross-sectional area is diminished relatively, is conducive to set up pressure reduction, forms shutoff.Its shortcoming is when being applied to be similar to Lu Maila and burying more shallow carbonate formation, because such carbonatite is connective better, porous, property are crisp, frangible, the plugged zone of formation is very easily destroyed and cause again missing in follow-up drilling process.The chemical plugging material mainly contains the chemical gel plugging agent, chance water is met oily expandable plugging additives, curable mortar architecture.The chemical gel plugging agent mainly is to utilize macromolecular material and linking agent generation chemical reaction to form to have certain elasticity, with rock the gelinite of stronger adhesive attraction is arranged and reach the purpose of shutoff drop ply, its main drawback is that bearing capacity is relatively poor, the bad control of gelation time.Meet water and meet oily expandable plugging additives and have certain swelling property, can not be strict with its particle and leakage channel and mate, and can be used with the bridge joint plugging agent and reach better plugging effect.But its be applied in connective better, there is problem destroyed in the follow-up drilling process equally in porous, crisp, the frangible carbonatite of property.Curable cement slurry ties up in the Process of Leaking Stoppage, and grout is not easy to be detained at leakage channel, and Chang Yin bleeds the depths, stratum and causes leak stopping failed, and because the coagulating property of grout, its injection length is control strictly, and difficulty of construction is large.
Summary of the invention
In order to solve the deficiency that exists in the background technology, the purpose of this invention is to provide a kind of high dehydration, can harden, become the plug plugging agent, this plugging agent integrates high dehydration, time lagged swelling, the curing of one-tenth plug, physical connection, the plugged zone that forms is difficult for destroyed in follow-up drilling process, Effective Raise leak stopping efficient.
The technical solution used in the present invention is: this high dehydration, can harden, become the plug plugging agent, comprise following component, each component by mass percentage: solidify material 35～50%, compound leakage stop agent 25～35%, high dehydration material 5～15%, elastic expansion material 5～10%, filamentary material 10～15%; Wherein: compound leakage stop agent is the particle shell: mica: cotton seed hulls in mass ratio 5:2:1 mixes; Solidify material is gypsum: cement: blast-furnace slag: sodium phosphate in mass ratio 1:1:0.5:0.1 mixes; High dehydration material is diatomite or flyash; The elastic expansion material is the overlay film water sucting rubber: overlay film water-absorbing resin in mass ratio 1:1 mixes; Filamentary material is the polyacrylonitrile fibre (molecular weight 10-15 ten thousand) of 9～11mm.
Overlay film water sucting rubber XJ-II and overlay film water-absorbing resin CSS wrap up water sucting rubber and water-absorbing resin with clay with spraying method at its surface uniform, discharge water sucting rubber and water-absorbing resin at pump during to bit port after hydrophthalmia shear fracture, overlay film water sucting rubber XJ-II and overlay film water-absorbing resin CSS are all available from Shandong Yiteng Chemical Co. Ltd..
The present invention has following beneficial effect: 1) shutoff speed is fast, and the leak stopping success ratio is high.Bridge formation particle in this plugging agent can produce shutoff fast by the bridge formation filling effect in hole, crack and solution cavity; Thereby the quick dehydration under differential pressure action of high dehydration material makes solid components assemble retrogradation, forms then compacting of filter cake; Modified polypropylene fiber secondary on the skeleton that bridging agent forms is built bridge, and makes plugged zone finer and close, then forms reticulated structure in plugged zone, makes the plugged zone strength increase, further improves the leak stopping success ratio.2) the plugged zone bearing capacity is strong, becomes plug effective, is difficult for duplicating leakage.Elastic expansion shaped material in this plugging agent, adopt clay to do protective membrane, water-swelling speed is slower in configuration and injection process, pass through bit port shear fracture protective membrane after under the Injection Well, the beginning water-swelling, and have the water of chance time lagged swelling characteristic, and in the plugged zone that forms, under the effect of leak-off water, continue water-swelling, further reinforce plugged zone; Solidify material in this plugging agent is filled in the leakage channel, solidifies in 6～10 hours by adjusting dosage, thereby reinforces connective better, porous, crisp, the frangible carbonatite borehole wall of property and leakage channel.This plugging agent behind the shutoff drop ply in the drop ply Open-Hole Section further Cheng Sai, fill space and crack that the borehole wall is not communicated with, by the solidification Reinforcing Shaft.Be difficult for again occurring leakage phenomena in the rear follow-up hole.3) can simplify the serious thief zone drilling program.This plugging agent compound method is simple, and available clear water is directly prepared, and does not need specific equipment, finishes only to need 8-12 hour from disposing to leak stopping.
Embodiment:
The present invention is further described below in conjunction with specific embodiment:
Embodiment 1, solidify material 35Kg, compound leakage stop agent 25 Kg, high dehydration material 15 Kg, elastic expansion material 10 Kg, filamentary material 15 Kg.
Embodiment 2, solidify material 40 Kg, compound leakage stop agent 30 Kg, high dehydration material 10 Kg, elastic expansion material 5 Kg, filamentary material 15 Kg.
Embodiment 3, solidify material 45 Kg, compound leakage stop agent 35 Kg, high dehydration material 5 Kg, elastic expansion material 5 Kg, filamentary material 10 Kg.
Embodiment 4, solidify material 50 Kg, compound leakage stop agent 30 Kg, high dehydration material 5 Kg, elastic expansion material 5 Kg, filamentary material 10 Kg.
Compound leakage stop agent is the particle shell in above-described embodiment: mica: cotton seed hulls in mass ratio 5:2:1 mixes; Solidify material is gypsum: cement: blast-furnace slag: sodium phosphate in mass ratio 1:1:0.5:0.1 mixes; High dehydration material is diatomite or flyash; The elastic expansion material is the overlay film water sucting rubber: overlay film water-absorbing resin in mass ratio 1:1 mixes; Filamentary material is the polyacrylonitrile fibre of 9～11mm.
More than each example be normal compound, after patching materials is mixed, add 40 parts of (weight) water rear test properties that stirs according to per 60 portions of (weight) plugging agents and see Table 1-3.
1, the mensuration of set time:
The plugging agent for preparing is stirred, pour in the beaker, put into water bath with thermostatic control (50 ℃) and measure once every 30min, measure once every 15min when closing on initial set, obtain time of coagulation.Table 1 is different embodiment determination datas set time:
Different embodiment measures table 1 set time
| Variable | Set time (h) |
| 50% embodiment, one leak stopping slurry | 10.2 |
| 50% embodiment, two leak stopping slurry | 8.4 |
| 50% embodiment, three leak stopping slurry | 7.3 |
| 50% embodiment, four leak stopping slurry | 6.1 |
As can be seen from Table 1, short set time according to the plugging agent that embodiment prepares, can satisfy the site operation requirement.
2, the mensuration of ultimate compression strength:
Plugging agent is placed 50 ℃ of water-bath maintenances under the temperature 48 hours, and the intensity when measuring the rear plugging agent generation deformation of curing with strength tester is ultimate compression strength.50 ℃ of lower each embodiment prepare plugging agent ultimate compression strength and see Table 2:
Different embodiment compressive strength determination tables 2
| Variable | Ultimate compression strength (MPa) |
| Embodiment one | 20 |
| Embodiment two | 20 |
| Embodiment three | 20 |
| Embodiment four | 20 |
As can be seen from Table 2, have higher ultimate compression strength after curable leak-stopping agent solidifies, can satisfy pouring after the shutoff.
3, the mensuration of sealing ratiod:
With the gluing quartz sand of Resins, epoxy, the preparation artificial cores carries out the shutoff experiment.Core diameter is 2.5cm, and length is 8.0cm, injects first clear water, surveys drill core permeability rate, then injects curable leak-stopping agent, and maintenance is 48 hours under 50 ℃ of temperature, surveys drill core permeability rate with clear water again.Each embodiment prepares the plugging agent sealing ratiod and sees Table 3:
Sealing ratiod=(rate of permeation one stifled rear rate of permeation before stifled)/rate of permeation before blocking up
Different embodiment prepare plugging agent sealing ratiod table 3
By as seen from Table 3, Lost Circulation Material with High Strength sealing ratiod of the present invention is all more than 96%, and plugging effect is good.
Field experiment:
Table 4
| Well is other | Pound sign | Applicable cases |
| Experiment well | R378 | Be drilled into Dammam layer (severe leakage layer) 627m place the property returned leakage occurs to lose, the blind 684m of being drilled into of clear water injects the compound leak stopping slurry of high density 38m3 after drilling drop ply, and loss of return goes out.According to embodiment 4 prescriptions, the preparation leak stopping is starched when 45 m3 are injected into 28 m3 has discontinuity to return out, after all injecting, pulls out of hole static 6 hours, and lower probing plug is filled in to 684m from the 636m brill, without leakage.12 hours consuming time. |
| Experiment well | R380 | Be drilled into Dammam layer (severe leakage layer) 618m place the property returned leakage occurs to lose, the blind 698m of being drilled into of clear water fills a prescription according to embodiment 4 after drilling drop ply, 60 m3 are starched in the preparation leak stopping, be injected into, have discontinuity to return out during 42m3, after all injecting, pulled out of hole static 6 hours, lower probing plug is filled in to 698m from the 641m brill, without leakage.11 hours consuming time. |
| The contrast well | R375 | Be drilled into Dammam layer 581m the property returned leakage occurs to lose, the blind 670m of being drilled into of clear water uses the high density compound leakage stop agent in conjunction with grout mode leak stopping 5 times (adjusting the used compound leakage stop agent dosage of next leak stopping and concentration according to the practical situation after each leak stopping) after drilling drop ply, use altogether high density compound leakage stop agent 170m3, grout 79m3,109 hours consuming time. |
Comprehensive above-mentioned example and relevant data, plugging agent of the present invention have the advantages such as cost is low, shutoff efficient height, weak point consuming time, are particularly useful for bore hole leakage segment length, and have the serious thief zone of various ways crack or hole.
Claims (3)
1. high dehydration, can harden, become the plug plugging agent, comprise following component, each component by mass percentage: solidify material 35～50%, compound leakage stop agent 25～35%, high dehydration material 5～15%, elastic expansion material 5～10%, filamentary material 10～15%; Wherein: compound leakage stop agent is the particle shell: mica: cotton seed hulls in mass ratio 5:2:1 mixes; Solidify material is gypsum: cement: blast-furnace slag: sodium phosphate in mass ratio 1:1:0.5:0.1 mixes; High dehydration material is diatomite or flyash; The elastic expansion material is the overlay film water sucting rubber: overlay film water-absorbing resin in mass ratio 1:1 mixes; Filamentary material is the polyacrylonitrile fibre of 9～11mm.
2. high dehydration according to claim 1, can harden, become the plug plugging agent, it is characterized in that: the diatomite particle diameter is the 600-800 order, the flyash particle diameter is the 600-800 order, the blast-furnace slag particle diameter is the 200-400 order, particle shell particle diameter is 6-40 purpose nut-shell, mica 6-40 purpose white mica, the cotton seed hulls particle diameter is the 2-6 order.
3. high dehydration according to claim 1, can harden, become the plug plugging agent, it is characterized in that: solidify material 50%, compound leakage stop agent 30%, high dehydration material 5%, elastic expansion material 5%, filamentary material 10%.
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| CN103740346A (en) * | 2013-12-31 | 2014-04-23 | 东营泰尔石油技术有限公司 | Plugging flexibilizer |
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| CN104232029A (en) * | 2014-08-16 | 2014-12-24 | 成都汉元君业油田技术有限公司 | Low-permeability plugging agent |
| CN104449625A (en) * | 2014-11-11 | 2015-03-25 | 四川宝麟新材料科技有限公司 | Fracturing type sand preventing fluid for oil and gas field and construction method thereof |
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| CN102443383A (en) | 2012-05-09 |
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