CN101921580B - High temperature resistant anti-salt isolation solution and preparation method thereof - Google Patents
High temperature resistant anti-salt isolation solution and preparation method thereof Download PDFInfo
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Abstract
本发明涉及抗高温抗盐隔离液及其制备方法，该隔离液由以下各组分按重量份配比组成：降滤失剂0.85～1.80份，悬浮稳定剂0.43～0.90份，流性调节剂0.21～0.45份，密度调节剂45～355份，清水100份，NaCl 0～36份。所述降滤失剂为2-丙烯酰胺-2-甲基丙磺酸或磺甲基褐煤，悬浮稳定剂为聚阴离子纤维素或黄原胶，流性调节剂为磺甲基丹宁或磺甲基酮醛树脂，密度调节剂为重晶石粉或铁矿粉。本发明隔离液加重能力强，具有宽广的密度调节范围，抗高温能力强，在150℃下保持性能稳定，与水泥浆、钻井液的化学相容性好，既可制备成淡水隔离液，也可制备成盐水隔离液，均具有抗温抗盐功效。The invention relates to a high-temperature and salt-resistant spacer fluid and a preparation method thereof. The spacer fluid is composed of the following components in proportion by weight: 0.85-1.80 parts of fluid loss reducer, 0.43-0.90 parts of suspension stabilizer, fluidity regulator 0.21 to 0.45 parts, 45 to 355 parts of density regulator, 100 parts of water, 0 to 36 parts of NaCl. The fluid loss reducer is 2-acrylamide-2-methylpropanesulfonic acid or sulfomethyl lignite, the suspension stabilizer is polyanion cellulose or xanthan gum, and the fluidity regulator is sulfomethyltannin or sulfomethyl lignite. Methyl ketone aldehyde resin, density regulator is barite powder or iron ore powder. The spacer fluid of the present invention has strong weighting ability, wide density adjustment range, strong high temperature resistance, stable performance at 150°C, good chemical compatibility with cement slurry and drilling fluid, and can be prepared as fresh water spacer fluid and also It can be prepared as saline isolation fluid, which has the effect of anti-temperature and anti-salt.
Description
Technical field
The present invention relates to be used for used high temperature resistant anti-salt isolation solution in oil drilling well cementation spearhead field and preparation method thereof.
Background technology
The well cementation of saline bed section, particularly deep-well saline bed and compound saline bed well cementation is that technical barrier to be solved is arranged all the time.In Central Plains, Sichuan, North China, Xinjiang, the triumph of China, tell all to bore on the section construction in oil fields such as Kazakhstan, Tarim Basin, the Bohai Sea and meet saline bed; Saline bed well cementation problem is also run into by domestic each oil company in the drilling well business of overseas foray, as the overseas project in states such as Kazakhstan, Uzbekistan, Indonesia.According to the data at home and abroad introduction, the complexcase that saline bed can produce when boring completion have: (1) Deep Salt Bed can present the character of plastic flow, and the viscous deformation of rock salt causes hole diameter to dwindle.
(2) with salt be mud shale, siltstone or the anhydrite agglomerate of carcass or cementing matter, meeting the low water of salinity can dissolve.The molten result of salt causes mud shale, siltstone, anhydrite agglomerate to lose support and caves in.
(3) be clipped in thin layer mud shale, the siltstone of rock salt interlayer, lose support up and down after salt is molten, under the mechanical collision effect, fall piece, cave in.
(4) water-swelling such as dehydrated gyp-, collapse.The dehydrated gyp-suction becomes the dihydrate gypsum volume and can increase about 26%, and other salts such as saltcake, magnesium chloride, calcium chloride etc. also have similarity.
(5) during gypsum or the gypseous mud stone transvrsal stress that fluid column pressure can not balance stratum itself in well, can in well, migrate and collapse.
Therefore, though saline bed is not the purpose payzone of oil gas drilling, can the cementing quality of saline bed section cementing quality, particularly deep-well saline bed and composite salt cream interval be directly connected to and finish next step operation and the key that becomes well.The factor that influences the saline bed cementing quality is a lot, comprises formation condition, borehole condition, property of drilling fluid, cement slurry property and washing fluid and spacer pad performance etc.Many at the research of saline bed well cementation working fluid at present, especially all compare extensively at the research and the application of salt resistant drilling and anti-salty mud, but the low problem of contact stain problem, the displacement efficiency of cement slurry of drilling fluid and grout still is difficult to solve.
For improving the cementing quality of grout, thereby proposed in the middle of drilling fluid and grout, to squeeze into one section special slurry, can wash away the borehole wall and casing wall, packing drilling fluid and grout preferably, avoid contact stain and improve the displacement efficiency of grout, this special slurry is called as spacer pad, what have also becomes washing fluid, and spacer pad and washing fluid are commonly referred to as spearhead.At present, many about the research of spacer pad, on-the-spot successful Application example is also more, and obtains using more widely in the oil field.But domestic most of spacer pad is that use range is narrow at the block characteristics research in own oil field, and the density span of control is little, and system does not have adaptability widely.And at the research of the anti-salt isolation solution system of water sensitivity mud, shale or saline bed well cementation with use less.
Data shows, the anti-salt isolation solution system is to propose in the gypsum-salt bed cementing technology in the Tr of Xinjiang tower the Northeast and secondary era stratum and use the earliest.Well cementation has effect preferably to the high-density anti-salt isolation solution of Xinjiang Oilfield development at present at saline bed, can effectively solve the compatibility problem of south, accurate Ge Er basin edge zone hp-ht well organic salt mud and grout, but its density range is at 2.0g/cm
3～2.5g/cm
3, it is used does not have extensive practicality; In addition, people such as the Li Jing of Southwest Petrol University have developed a kind of salt-containing separating liquid system (patent publication No. CN101089114A) at a saline bed well cementation difficult problem, it can effectively solve the contact stain problem of saline bed cementing slurry and drilling fluid, has anti-calcium and anti-salt ability preferably, but its spacer pad use temperature scope is narrower, require not satisfy as yet for the well cementation more than 100 ℃, and the spacer pad preparation is complicated, the aquation preset time of clay is longer.The present invention compares with present achievement in research, not only has good anti-salt contamination resistance, also has the temperature applicable range and the density scope of application widely simultaneously, prepares simple and easyly, has practicality widely.
Summary of the invention
The object of the present invention is to provide a kind of high temperature resistant anti-salt isolation solution, be adapted to high-temperature stratum, the well cementing operation of big section saline bed, to solve problems such as saline bed displacement efficiency of cement slurry difference and cement stone consolidation strength are low, the present invention is at density 1.1g/cm
3～2.5g/cm
3Performance is controlled in the scope; Under 150 ℃ of high temperature, still keep stable performance; Under fresh water and saturated brine situation, all can keep stable performance, solve the problem of common spacer pad salt resistance difference; Good with the consistency of grout, drilling fluid, avoid grout and drilling fluid contact stain, its good isolation washing action has effectively improved the displacement efficiency of grout, improves the well cementation bonding quality.
Another object of the present invention is to provide the preparation method of this high temperature resistant anti-salt isolation solution, this preparation method is easy and simple to handle, has practicality widely.
For reaching above technical purpose, the invention provides following technical scheme.
High temperature resistant anti-salt isolation solution, form by weight ratio by following each component: 100 parts in 0～36 part of clear water of 45～355 parts of NaCl of 0.21～0.45 part of density adjuster of 0.43～0.90 part of fluidity conditioning agent of 0.85～1.80 portion of suspension stabilizer of fluid loss agent in the present invention, suspension stabilizer is Polyanionic Cellulose or xanthan gum; Fluid loss agent is 2-acrylamide-2-methyl propane sulfonic acid or sulfonated-methyl brown coal; The fluidity conditioning agent is sulfonated methyl tannin or sulphur methyl ketone urea formaldehyde; Density adjuster is ground barium sulfate or powdered iron ore.
Above material is commercially available.
When not containing NaCl, the present invention is the fresh water anti-salt isolation solution.When containing NaCl, the present invention is a brine spacer.
The preparation method of high temperature resistant anti-salt isolation solution of the present invention is as follows: 1. fresh water anti-salt isolation solution: in 100 parts of clear water, add 0.85～1.80 part of fluid loss agent successively, 0.43～0.90 part of suspension stabilizer, 0.21～0.45 part of fluidity conditioning agent stirs 40min and is evenly distributed in the clear water to raw material under low speed; Add 45～355 parts of density adjusters then, stir 20min to homodisperse under low speed, fresh water anti-salt isolation solution composition is promptly prepared and is finished.
2. saturated brine spacer pad: in 100 parts of fresh water of preparation, add NaCl36 part successively, 0.85～1.80 part of fluid loss agent, 0.43～0.90 part of suspension stabilizer, 0.21～0.45 part of fluidity conditioning agent stirs 40min and is evenly distributed in the clear water to raw material under low speed; Add 45～355 parts of density adjusters then, stir 20min to homodisperse under low speed, the saturated brine spacer pad is promptly prepared and is finished.
In the present invention, each component is weight part.
Compared with prior art, the present invention has following beneficial effect: the ability that 1. increases the weight of is strong, has broad Auto-regulating System of Density of Heavy Medium scope, and the Auto-regulating System of Density of Heavy Medium scope is 1.1～2.5g/cm
32. high-temperature resistance is strong, and the present invention is the highest to keep stable performance down at 150 ℃; 3. saline-alkaline tolerance is strong, and the present invention still keeps stable performance under saturated salt; 4. chemical compatibility is good, and the consistency of the present invention and grout, drilling fluid is good, and the contact stain that can successfully solve between grout and drilling fluid is the difficult problem that cementing quality descends; 5. the present invention both can be prepared into the fresh water anti-salt isolation solution, also can be prepared into brine spacer, and two kinds of different spacer pads all have the heat and salinity tolerance effect.
Description of drawings
Fig. 1 is the consistency change situation of 1# spacer pad maintenance under 130 ℃ of conditions; Fig. 2 is 1.3g/cm
3The multiviscosisty curve of grout (1# fresh water spacer pad) under 130 ℃ of conditions; Fig. 3 is a grout: drilling fluid: the 1# spacer pad=multiviscosisty curve of 1: 1: 1 mixed slurry under 130 ℃ of conditions; Fig. 4 is the consistency change situation of 4# spacer pad maintenance under 150 ℃ of conditions; Fig. 5 is 1.36g/cm
3The multiviscosisty curve of grout (4# saturated brine spacer pad) under 150 ℃ of conditions; Fig. 6 is a grout: drilling fluid: the 4# spacer pad=multiviscosisty curve of 1: 1: 1 mixed slurry under 150 ℃ of conditions.
Embodiment
Further specify the present invention below in conjunction with accompanying drawing.
The preparation embodiment 1:1# fresh water anti-salt isolation solution of high temperature resistant anti-salt isolation solution of the present invention, form by weight ratio by following each component: add 1.80 parts of 2-acrylamides-2-methyl propane sulfonic acid in 100 parts of water, 0.90 part of Polyanionic Cellulose, 0.45 part of sulfonated methyl tannin stirs under low speed and was evenly distributed in the clear water to raw material in 2 hours; Add 46 parts of ground barium sulfates then, under low speed, stir 1 hour, be made into proportion 1.2g/cm to homodisperse
3The fresh water anti-salt isolation solution.
Embodiment 2:2# fresh water anti-salt isolation solution, form by weight ratio by following each component: add 1.40 parts of sulfonated-methyl brown coals in 100 parts of water, 0.70 part of xanthan gum, 0.35 part of sulphur methyl ketone urea formaldehyde stirs under low speed and was evenly distributed in the clear water to raw material in 2 hours; Add 149 parts of ground barium sulfates then, under low speed, stir 1 hour, be made into proportion 1.8g/cm to homodisperse
3The fresh water anti-salt isolation solution.
Embodiment 3:3# fresh water anti-salt isolation solution, form by weight ratio by following each component: add 0.85 part of 2-acrylamide-2-methyl propane sulfonic acid in 100 parts of water, 0.43 part of xanthan gum, 0.21 part of sulfonated methyl tannin stirs under low speed and was evenly distributed in the clear water to raw material in 2 hours; Add 355 parts of powdered iron ore then, under low speed, stir 1 hour, be made into proportion 2.4g/cm to homodisperse
3The fresh water anti-salt isolation solution.
Embodiment 4:4# saturated brine spacer pad, form by weight ratio by following each component: in 100 parts of fresh water of preparation, add NaCl36 part successively, 1.80 parts of 2-acrylamides-2-methyl propane sulfonic acid, 0.90 part of Polyanionic Cellulose, 0.45 part of sulfonated methyl tannin stirs under low speed and was evenly distributed in the water to raw material in 2 hours; Add 46 parts of ground barium sulfates then, under low speed, stir 1 hour, be made into proportion 1.25g/cm to homodisperse
3The saturated brine spacer pad.
Embodiment 5:5# saturated brine spacer pad, form by weight ratio by following each component: in 100 parts of fresh water of preparation, add NaCl36 part successively, 1.40 parts of sulfonated-methyl brown coals, 0.70 part of xanthan gum, 0.35 part of sulphur methyl ketone urea formaldehyde stirs under low speed and was evenly distributed in the water to raw material in 2 hours; Add 149 parts of ground barium sulfates then, under low speed, stir 1 hour, be made into proportion 1.85g/cm to homodisperse
3The saturated brine spacer pad.
Embodiment 6:6# saturated brine spacer pad is made of by weight ratio following each component: in 100 parts of fresh water of preparation, add NaCl36 part successively, 0.85 part of sulfonated-methyl brown coal, 0.43 part of xanthan gum, 0.21 part of sulfonated methyl tannin stirs under low speed and was evenly distributed in the water to raw material in 2 hours; Add 355 parts of powdered iron ore then, under low speed, stir 1 hour, be made into proportion 2.45g/cm to homodisperse
3The saturated brine spacer pad.
The performance test embodiment 7:(of high temperature resistant anti-salt isolation solution of the present invention is an example with 1# fresh water anti-salt isolation solution and 4# saturated brine spacer pad) spacer pad sedimentation stability mensuration: 1. the spacer pad for preparing is preset 5h under test temperature; 2. take out to pour into and leave standstill 2h mensuration upper, middle and lower density difference and bleed in the 500ml graduated cylinder.The results are shown in Table 1, Fig. 1, table 4, Fig. 4.
The spacer pad rheological property adopts normal form six fast rotary viscosity design determinings: 1. the spacer pad for preparing is preset 5h under test temperature; 2. take out and measure its rheological property.The results are shown in Table 2, table 5, along with variation of temperature, the slurry denseness of spacer pad descends to some extent, this is a polymer segment unfolded reason at high temperature, but slurry still keeps good rheological characteristics.
(proportion is 116g/cm for spacer pad and drilling fluid
3), (proportion is 1.3g/cm to grout
3) the consistency experimental evaluation carries out with reference to AP I standard 10,90 ℃ of experimental temperatures the results are shown in Table 3; (proportion is 1.20g/cm for spacer pad and drilling fluid
3), (proportion is 1.36g/cm to grout
3) the consistency experimental evaluation carry out with reference to API standard 10,90 ℃ of experimental temperatures the results are shown in Table 6.
As can be seen, under different temperature, fresh water density isolating liquid difference is all less than 0.02g/cm from table 1, table 2, table 3, Fig. 1
3, the surface does not have bleed; Spacer pad maintenance under higher temperature can keep good slurry performance.Therefore, the spacer pad of this density has stability preferably.
Referring to Fig. 2, Fig. 3, Fig. 5, Fig. 6, as we know from the figure,, has the better chemical compatibility with drilling fluid, grout no matter be fresh water anti-salt isolation solution or brine spacer.
As can be seen, the saturated brine spacer pad is with the increase of temperature from table 4, table 5, table 6, Fig. 4, and its difference of densities keeps less numerical value, and does not have bleed; Spacer pad has good rheological under different temperature; The chemical compatibility of spacer pad and drilling fluid, grout is good, and not short coagulation phenomena takes place.
The stability of table 1 1# spacer pad
The rheological of table 2 1# spacer pad
The consistency of table 3 1# spacer pad and grout, drilling fluid
The stability of table 4 4# spacer pad
The rheological of table 5 4# spacer pad
The consistency of table 6 4# spacer pad and grout, drilling fluid
| Temperature (℃) | 25 | 40 | 60 | 80 | 90 | 100 | 115 | 130 | 140 | 150 |
| Difference of densities (g/cm 2) | 0.002 | 0.003 | 0.003 | 0.004 | 0.006 | 0.010 | 0.012 | 0.014 | 0.016 | 0.018 |
| Bleed (ml) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Temperature (℃) | 25 | 40 | 60 | 80 | 90 | 100 | 115 | 130 | 140 | 150 |
| Difference of densities (g/cm 3) | 0.001 | 0.002 | 0.002 | 0.003 | 0.004 | 0.006 | 0.009 | 0.012 | 0.012 | 0.014 |
| Bleed (ml) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| CN101921580B true CN101921580B (en) | 2011-09-07 |
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Cited By (1)
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| WO2013055843A1 (en) * | 2011-10-12 | 2013-04-18 | Saudi Arabian Oil Company | Cement oil-based mud spacer formulation |
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| CN102337108B (en) * | 2011-10-28 | 2012-10-31 | 西南石油大学 | High-efficiency anti-pollution spacer fluid for well cementing and preparation method thereof |
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| CN106221683B (en) * | 2016-07-07 | 2019-03-12 | 中国石油集团川庆钻探工程有限公司 | Preparation method of well cementation spacer fluid for water-based drilling fluid |
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| CN113355070B (en) * | 2021-07-13 | 2022-10-11 | 中石化石油工程技术服务有限公司 | High-temperature-resistant plug pressing fluid for well cementation of oil and gas well and preparation method thereof |
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