CN101429424A - Di-kalium ion-polymer drilling fluid with strong rejection capability - Google Patents
Di-kalium ion-polymer drilling fluid with strong rejection capability Download PDFInfo
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- CN101429424A CN101429424A CNA2008102326429A CN200810232642A CN101429424A CN 101429424 A CN101429424 A CN 101429424A CN A2008102326429 A CNA2008102326429 A CN A2008102326429A CN 200810232642 A CN200810232642 A CN 200810232642A CN 101429424 A CN101429424 A CN 101429424A
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Abstract
The invention relates to a strong inhibition double-kalium ion, namely polymer drilling fluid, which is characterized in that the strong inhibition double-kalium ion, namely polymer drilling fluid comprises the following materials in weight percentage: A. 7 to 9 percent of inorganic kali salt used as an inorganic inhibitor; B. 0.5 to 0.6 percent of organic kali salt used as an organic inhibitor; C. 0.3 to 0.5 percent of viscidity improving agent; D. 0.3 to 0.5 percent of filter loss reducing agent; E. 0.3 to 0.5 percent of alkalinity controlling agent; F. 0.03 to 0.1 percent of preservative agent; G. 0.1 to 0.2 percent of antifoaming agent; H. 1 to 8 percent of weight additive; and the balance being water. The drilling fluid has stronger functions of inhibiting hydration, expansion and dispersion of clay mineral, and also has better rheological property, so that the drilling fluid is low filter loss non-solid phase polymer drilling fluid.
Description
Technical field
The invention belongs to a kind of drilling fluid, particularly a kind of inhibition shale hydration expansible water-base drilling fluid di-kalium ion-polymer drilling fluid with strong rejection capability.
Background technology
As everyone knows, drilling fluid is the blood of drilling well, plays crucial effect in petroleum drilling.Water-base drilling fluid experienced from rough segmentation loose drilling fluid, finely divided drilling fluid, to the development course of dispersed drilling fluid not.At present, in drilling operation, adopt many still rough segmentations to loose and finely divided drilling fluid system, this system have a following shortcoming: the solid load height, rate of penetration is low, the easy aquation of mud stone expands and strides and collapses, and causes hole shrinkage, tight trip or when creeping into moment of torsion bigger than normal, the borehole wall caves in when serious, even because of caving in down-hole accidents such as causing drilling tool.In order to satisfy the requirement of drilling engineering, improve the performance of drilling fluid, improve the strong rejection capability of mud system, help wellbore stability.
Summary of the invention
In order to overcome the deficiencies in the prior art, the purpose of this invention is to provide a kind of very strong inhibition clay mineral hydration swelling dispersive function that both had, has good rheological again, the no solid polymer di-kalium ion-polymer drilling fluid with strong rejection capability of low filtration loss.
Technical scheme of the present invention is achieved in that a kind of di-kalium ion-polymer drilling fluid with strong rejection capability, it is characterized in that: di-kalium ion-polymer drilling fluid with strong rejection capability comprises the material of following weight per-cent:
A, as the inorganic potassium salt 7%-9% of inorganic inhibitor;
B, as the potassium salt 0.5%-0.6% of organic inhibitor;
C, carry stick 0.3%-0.5%;
D, fluid loss agent 0.3%-0.5%;
E, alkalinity control agent 0.3%-0.5%;
F, sanitas 0.03%-0.1%;
G, defoamer 0.1%-0.2%;
H, weighting agent 1%-8%;
Surplus is a water.
Described inorganic potassium salt is that Repone K or vitriolate of tartar or saltpetre are at the interior inorganic salt that potassium ion can be provided.
Described potassium salt is that polyacrylic acid potassium or potassium formiate or potassium acetate are at interior organic salt with potassium ion functional group.
The described stick of carrying is xanthan gum or melon glue.
Described fluid loss agent is high adhesive aggregation anionic cellulose, low adhesive aggregation anionic cellulose, high sticking carboxymethyl cellulose, low sticking carboxymethyl cellulose, starch based at interior one or both.
Described alkalinity control agent is sodium hydroxide or potassium hydroxide or calcium hydroxide.
Described sanitas is a kind of in formaldehyde or the glutaraldehyde.
Described defoamer is silicone antifoam agent or polyether antifoam agent.
Described weighting agent is a kind of in barite part or the powdered iron ore.
Described di-kalium ion-polymer drilling fluid with strong rejection capability is that the compound by aforementioned proportion carries out according to following program at normal temperatures and pressures:
1) pack in the slurry commanding tank at the scene clear water of said ratio;
2) a kind of, a kind of stick, one or both fluid loss agents carried of the organic inhibitor of said ratio added successively in the clear water in the step 1) and mix;
3) add a kind of inorganic salt inhibitor of aforementioned proportion again, stir it is fully dissolved;
4) add a kind of weighting agent of aforementioned proportion, a kind of sanitas, a kind of defoamer, stirring and dissolving more respectively;
5) a kind of alkalinity control agent with aforementioned proportion is adjusted to 9-10 with PH.
Characteristics of the present invention are: when the drilling well of easy aquation expands and caves in rock stratum, because of the stratum pulping is serious, easily produce the mud drum drilling tool, influence problems such as drilling speed.Therefore, main purpose of the present invention is at first passed through the collaborative combination of inorganic salt inhibitor and organic salt inhibitor, form the two potassium ion drilling fluid systems of strong inhibition type, simultaneously, suitably improve the density of drilling fluid again from the mechanical balance angle, regular coal seam or coal, mud stone mix the borehole wall of layer, and be last, select for use the high-quality biological polymer to regulate the rheological of drilling fluid, final formation has two potassium ion biopolymer drilling fluid systems of strong rejection capability.Finally reach stabilizing borehole, reduce the purpose of down-hole accident.
Select the inorganic salt inhibitor for use, improved the salinity in the drilling fluid water, reduced the osmotic pressure that the drilling fluid water enters mud shale; The structural chemistry principle that the radius of potassium ion is suitable with clay hole size is inlaid into potassium ion and stops water molecules further to enter in the crystals of clay in the clay lattice; Utilize in the positive charge of inorganic salt and the negative charge of surface of clay, dwindle the Van der Waals force of clay intergranule, compress its electrostatic double layer.Organic inhibitor utilizes its bag quilt and throwing out when potassium ion is provided, the coalescent solid control equipment that utilizes subsequently of clay particle flocculation that part is distributed in the drilling fluid is removed, and reaches the dual function that suppresses and reduce solid phase.Be drilled into the coal seam at last, by improving density, the measure inhibition coal seam of equilibrium strata pressure or coal, mud stone mix layer and cave in again.Like this, the new system of development is from many aspects, and a plurality of angles improve its inhibition, finally reach the purpose of stabilizing borehole.
Because the present invention is used in the system of weighted drilling fluid, has good lubricating property in order to make drilling fluid, on the basis of strong rejection capability-polymer drilling fluid of the present invention, also further contains 2%-4% oil lubricant.It is good that such drilling fluid has lubricity, make a trip smoothly, reaming does not aspirate, characteristics such as rate of penetration height, and, can control the stratum pulping effectively because the coordinate repression of the inhibitor of organic salt polymkeric substance and inorganic salt makes such drilling fluid have very strong inhibition ability, characteristics such as maintenance time is long, guaranteed that particularly ground, shaft bottom is clean, guaranteed downhole safety, saved drilling cost.
Description of drawings
Fig. 1 is a low-density solid curve contrast synoptic diagram in well depth and the drilling fluid.
Fig. 2 is well depth and the drilling well speed ratio curvilinear motion synoptic diagram that surges.
Embodiment
The invention will be further described below in conjunction with embodiment, but following embodiment is not used in restriction practical range of the present invention.
Long celebrating gas field, northern Shensi, oil field gas water horizontal well bores when meeting Shi Qian peak group and Shihezi group (abbreviation " two stone layer "), two stone layer mud shale belong to smectites, with water generation water-swelling, cause hole shrinkage, tight trip or when creeping into moment of torsion bigger than normal, the borehole wall caves in when serious, even because of caving in down-hole accidents such as causing drilling tool.Handle similar down-hole accident and will waste a large amount of penetration times, cost of development also sharply rises simultaneously, and well is scrapped.In addition, when bore meeting the coal seam, Shanxi, because the coal seam has anisotropic bedding and texture structure, tensile strength is more weak and to be easy to cave in also be to cause the unsteady factor of the borehole wall.
In addition, because " two stone layer " mostly is in the key well section of big gradient, the coal seam is in into window or zone of interest horizontal section, and the rock that is in the bottom is less relatively or do not have to the supporting role of its top rock; Drilling speed is relatively slow, has prolonged the soak time of drilling fluid to rock.These factors have all been aggravated striding of they and have been collapsed.When strong rejection capability-polymer drilling fluid of the present invention bores chance Shi Qian peak group and Shihezi group (abbreviation " two stone layer ") at gas field, northern Shensi gas water horizontal well, two stone layer mud shale belong to smectites, with water generation water-swelling, cause hole shrinkage, tight trip or when creeping into moment of torsion bigger than normal, the borehole wall caves in when serious, even because of caving in down-hole accidents such as causing drilling tool.The present invention is obtaining great success in the use in gas field, northern Shensi, especially solved gas field, northern Shensi " two stone layer " easily aquation expansion always for these years, caved in, and the problem of collapsing is easily striden in the coal seam, Shanxi.
1. indoor new system and the contrast of known architectures inhibition
For ease of the relatively difference of new invention system and known all systems, according to table 1, the component of table 2 respectively disposes two individual system, is applicable to three samples of different well sections respectively,
Table 1: each system formulation of anti-collapse property test is formed (weight ratio)
In the table: low adhesive aggregation anionic cellulose, high adhesive aggregation anionic cellulose derive from Changqing petroleum technology Co., Ltd., Xi'an city; Silicone antifoam agent DRX-1 derives from Xinjiang Sanjing Derun Technology Co., Ltd..
Table 2: each system formulation of anti-collapse property test is formed (weight ratio)
The anti-collapse property evaluation experimental of table 3 system
Remarks: 1. 2. 3. fill a prescription: the di-kalium ion-polymer system, 4. 5. 6. fill a prescription: polymkeric substance-sulfonated drilling fluid system
Experimental evidence standard: ZB/T E11001-89
Table 4: other performance comparison of new system and known architectures
Can find out from top test-results: the primary recovery and the secondary recovery rate of three two potassium ion polymer drilling fluid samples of rig-site utilization, the shale rate of recovery apparently higher than three common polymer-sulfonated drilling fluids, polymkeric substance-sulfonated drilling fluid once, the secondary recovery rate is all obviously on the low side, illustrates that this mud makes mud shale Chemical Inhibition and borehole wall stability all relative bad; And two potassium ion polymer drilling fluids are used in three samples of different well sections, once all the reaching more than 90% with the secondary recovery rate of shale.The primary recovery reflection drilling fluid Chemical Inhibition power of shale, the dispersiveness of landwaste in clear water after the reflection of secondary recovery rate is soaked through drilling fluid, dispersiveness is more little, and it is stronger to illustrate that shale is suppressed effect, and the borehole wall is more stable naturally.Therefore, the two potassium ion polymer drilling fluid systems of strong rejection capability play significant inhibitory effect to mud shale, and the borehole wall is more stable.But other performance basically identical of new invention drilling fluid system and known drilling fluid system shows the new invention system when satisfying the field performance requirement, increases substantially the unanimity effect of drilling fluid to mud shale.
2. inorganic salt inhibitor and organic salt inhibitor synergy contrast
The laboratory also preliminary study the coordinate repression of inorganic inhibitor and organic inhibitor, along with the increase of inhibitor concentration, inhibition increases.And two kinds of inhibitor are compound, obviously suppress effect and are better than single inhibitor inhibition effect.The shale primary recovery of glue also increases (landwaste of two stone layers) thereupon.
Table 5: inorganic salt inhibitor and organic salt inhibitor synergy correlation data
| Numbering | Prescription | Density (g/cm 3) | AV (mPa.s) | Landwaste amount (g) | The rate of recovery (%) |
| 1 | 0.3％KPAM | 1.00 | 2.5 | 25.32 | 50.64 |
| 2 | 7％KCL | 1.02 | 2.0 | 29.31 | 58.62 |
| 3 | 0.3％KPAM+7％KCL | 1.00 | 2.25 | 39.37 | 78.74 |
| 4 | 0.4％KPAM | 1.00 | 2.5 | 30.24 | 60.48 |
| 5 | 8.0％KCL | 1.00 | 2.0 | 32.43 | 66.86 |
| 6 | 0.3％KPAM+8.0％KCL | 1.01 | 2.25 | 42.19 | 84.38 |
| 7 | 0.5％KPAM | 1.02 | 2.0 | 35.83 | 71.66 |
| 8 | 9.0％KCL | 1.02 | 2.25 | 39.08 | 78.16 |
| 9 | 0.5％KPAM+9.0％KCL | 1.03 | 2.0 | 46.29 | 92.58 |
Annotate: KPAM is a polyacrylic acid potassium.
3. the synergy between the inorganic inhibitor
Table 5 keeps inorganic inhibitor total amount 8% constant, changes the consumption of two kinds of inorganic inhibitors, and data show, adopt two kinds of inhibitor to suppress the restraining effect of effect significantly better than single inhibitor.
Table 6: Synergism Testing data between the inorganic inhibitor
In the table: low adhesive aggregation anionic cellulose, high adhesive aggregation anionic cellulose derive from Changqing petroleum technology Co., Ltd., Xi'an city; Silicone antifoam agent DRX-1 derives from Xinjiang Sanjing Derun Technology Co., Ltd..
The field case preparation procedure
Di-kalium ion-polymer drilling fluid with strong rejection capability of the present invention is to be carried out according to following program at normal temperatures and pressures by the compound that belongs to proportioning down:
1) density and the mutual transforming relationship of volume by water, the clear water of proportioning in the table 1 of packing in the slurry commanding tank at the scene; Calculated the consumption of various materials again according to the weight of water;
2) according to calculating consumption, with the organic inhibitor of following proportioning, carry stick, fluid loss agent and add successively in the clear water in the step 1) and mix;
3) add the inorganic salt inhibitor of following proportioning again, stir it is fully dissolved;
4) add weighting agent, sanitas, the defoamer of following proportioning more respectively, stirring and dissolving;
5) with alkalinity control agent PH is adjusted to 9-10.
6) drilling fluid for preparing, according to the check of U.S. API (American Petroleum Institute) drilling fluid testing standard, its performance reaches normally creeps into requirement.
Example 1
Example 1 is by the two potassium ions of above-mentioned strong inhibition of having invented-polymer drilling fluid new system, and its prescription composition sees Table 2. described prescription composition in 6, prepares at the scene according to above-mentioned preparation procedure.Carried out the test in place of 7 mouthfuls of wells, wherein at the CB4-1 well, its effect that obtains is as follows:
1. improve the drilling fluid inhibition, stablize the well effect
1.. because KPAM and KCL add in the slurry with the desk research ratio, the anti-collapse property of inhibition and the quality of having improved mud cake of drilling fluid have been increased greatly, simultaneously, the dehydration of drilling fluid is reduced to about 5ml, after 3000 meters, further 3ml is reduced in dehydration, " in the whole process that the long open hole section of large size creeps into; the accumulation reaming that makes a trip has only been used 30 hours; and not with identical well section much 401 hours of the reaming time of accumulation of the CB3-1 well of this system; even more seriously fall the drilling tool salvaging and have no resolution, force and fill out well operations 4 times at CB4-1 well 121/4.
2.. control suitable drilling fluid density, increase borehole wall mechanical balance, reach anti-collapse purpose.After being drilled into well depth and reaching 3000 meters, drilling fluid density is exacerbated to 1.20g/cm with ground barium sulfate
3, both effectively stablized the borehole wall, do not press again and leak the stratum.
2. the anti-card technique of frictional resistance falls in drilling fluid lubricating
1.. after hole deviation surpasses 40 °, add 0.5% oil lubricant JN301 (Chengdu Taurus drilling fluid materials factory), improve the lubricity of drilling fluid, especially, lubricant content is brought up to 3% from 1% to later stage long horizontal traverse well section.
2.. suppress and the coalescent effect of flocculating because the KPAM in the drilling fluid plays, removed the useless solid phase in the drilling fluid effectively.In addition, try one's best and hold solid control equipment successfully.4 Derric vibratory screening apparatuss (every has 4 blocks of wire screen) ran without interruption in 24 hours, according to the thickness of landwaste amount and landwaste, had in time improved the order number of its wire screen, and the order number is brought up to 250 orders gradually by 110 orders of beginning.Desilt, sand separator, whizzer also guarantee operation always in penetration time.In addition, optimize the circulation process of whizzer, desilt, desanding all-in-one, the effect of solid control equipment has obtained performance to greatest extent, guarantees that drilling fluid circulates under no solid phase low density state, has improved rate of penetration.
Fig. 1 is a low-density solid graphic representation in the drilling fluid in the whole service process.Because the strong restraining effect of drilling fluid system, the harmful low-density solid that is dispersed in the drilling fluid is lower than 5%, in addition, because the throwing out of organic inhibitor, even if be distributed to a small amount of solid phase in the drilling fluid, is also removed by flocculation.
3.. in the site operation, the maintenance each time and the processing of drilling fluid in effectively anti-collapse, all are purpose with the lubricate and sticking control.In big gradient section was crept into, drilling fluid lubricating was functional, and mud cake is thin and tough, smooth, and the mud cake coefficient of friction resistance is controlled at 0.0262～0.0437 (1.5 °～2.5 °).Do not cause resistance, card in the construction because of the drilling fluid lubricating performance is bad, sticking card accident does not take place, drilling fluid keeps the operation of good lubrication performance always, and the drilling tool moment of torsion is in than under the low condition and creeps into.
3. drilling fluid hole cleaning technology
Keep the good rheological of drilling fluid, improve the efficient that landwaste returns out.Guarantee suitable viscosity, high shear force, particularly high rotational viscosimeter 6RPM reading (big gradient section remains on more than 12 always), shear force height in construction, ratio of dynamic shear force/yield value to plastic viscosity value height (Figure 14) is so can effective cutting carring.
Fig. 2 is a drilling fluid rheology index in the drilling fluid operational process---the change curve of moving speed ratio.For drilling fluid, except inhibition preferably, outside the stabilizing borehole effect.Prior also will have good rheological, in time the landwaste in the well successfully brought to outside the well.The neoteric drilling fluid system in Fig. 2 surface has good rheological, and moving speed ratio surpassed for 0.7 (general requirement surpasses 0.5), can successfully take landwaste out of fully, kept well totally unimpeded.
4. the treatment technology before the running casing
After finishing to creep into, with same at ordinary times method with thick slurry cleaning well twice, reach 8 hours subsequently, all circulation more than three, the long horizontal traverse well section after 2500 meters pumps into the thick slurry plug near 1000 meters.In order to prevent that well is pressed leakage in the running casing process, with drilling fluid dilution (performance sees Table 19), add barite in the time of dilution density is remained unchanged with clear water.Through above-mentioned technical measures treated drilling fluid, running casing is unblocked, make sleeve pipe smoothly down to the shaft bottom 3493 meters propose to 3486 meters predetermined position successfully well cementation then.
Comprehensive above-mentioned example and relevant data, of the present invention pair of potassium ion polymer drilling fluid has the good restraining caving-preventing ability, and it is unblocked to make a trip, and it is good that downhole conditions suppresses, electrical measurement well rule.Can better successfully take the landwaste in the well out of ground, lubricity is good, low moment of torsion operation in creeping into, because good inhibition and flocculation, drilling fluid is in the low density operation all the time.And strong inhibition capability, density is moderate, is easy to control, and dehydration is low, mud cake densification, characteristics such as oilness is good, downhole safety.Reach 5 meters/hour at this well average rate of penetration.
Example 2
Example 2 is by the two potassium ions of above-mentioned strong inhibition of having invented-polymer drilling fluid new system, and its prescription composition sees Table 1. described prescription composition in 6, prepares at the scene according to above-mentioned preparation procedure.Carried out the test in place of 2 mouthfuls of wells, wherein in quiet flat 16-14 application, its effect that obtains is as follows:
1.. the performance of drilling fluid in the use:
Table 7: example 2 property of drilling fluid tables
2.. the shale recovery test
Fetch two potassium ion polymer drilling fluid samples of Different Strata from the scene of using, do the shale recovery test, observe a little less than its strong inhibition capability mud shale.From the following table data as can be seen, on-the-spot two potassium ion polymer drilling fluid system shows very strong shale inhibition in using at the scene, primary recovery mean value surpasses more than 90%, and reaction is subjected to the secondary recovery rate of the shale stability after drilling fluid system soaks also to surpass more than 80%.
Table 8: example 2 shale recovery test data
| The sampling stratum | W1(g) | Primary recovery (%) | W2(g) | Secondary recovery rate (%) |
| Prolong | 46.76 | 93.32 | 42.87 | 83.74 |
| Buddhist monk's ditch | 45.25 | 90.5 | 43.75 | 87.5 |
| Liu family's ditch | 44.27 | 88.54 | 46.54 | 93.08 |
| Shi Qianfeng | 43.87 | 87.74 | 42.89 | 85.78 |
| The Shihezi | 47.65 | 95.3 | 41.65 | 83.3 |
| Shanxi | 45.54 | 91.08 | 42.58 | 85.16 |
3.. the shale expansion test
Fetch two potassium ion polymer drilling fluid samples of Different Strata from the scene of using, do the test of shale expansion rate, further observe a little less than its strong inhibition capability mud shale.From the following table data further as can be seen, on-the-spot two potassium ion polymer drilling fluid systems still show very strong shale inhibition in using at the scene, and the rate of expansion mean value of shale reaches about 70%.
Table 9: example 2 shale expansion rate testing datas
| The sampling stratum | Prolong | Buddhist monk's ditch | Liu family's ditch | Shi Qianfeng | The Shihezi | Shanxi |
| Shale expansion rate % | 72 | 68 | 64 | 69 | 72 | 71 |
4. reservoir protection test
Take from three samples of di-kalium ion-polymer drilling fluid of rig-site utilization, do the static state injury test of three blocks of rock cores, observe the injury size of this drilling fluid system the stratum.From testing data as can be seen, the di-kalium ion-polymer drilling fluid system is in use very little to formation damage, shows when this system has strongly inhibited, also has reservoir protection effect preferably.
Table 10: example 2 reservoir protection testing datas
5.. the on-the-spot simple density control of using
Control suitable drilling fluid density, increase borehole wall mechanical balance, reach anti-collapse purpose.After being drilled into well depth and reaching 3000 meters, drilling fluid density is exacerbated to 1.20g/cm with ground barium sulfate
3, both effectively stablized the borehole wall, do not press again and leak the stratum.Guarantee that drilling fluid circulates under no solid phase low density state, improved rate of penetration.Because the strong restraining effect of drilling fluid system, the harmful low-density solid that is dispersed in the drilling fluid is lower than 5%, in addition, because the throwing out of organic inhibitor, even if be distributed to a small amount of solid phase in the drilling fluid, is also removed by flocculation.
6. hole cleaning technology
Keep the good rheological of drilling fluid, improve the efficient that landwaste returns out.Guarantee suitable viscosity, high shear force, so the high and ratio of dynamic shear force/yield value to plastic viscosity value height of shear force in construction is can effective cutting carring.For drilling fluid, except inhibition preferably, outside the stabilizing borehole effect.Prior also will have good rheological, in time the landwaste in the well successfully brought to outside the well.The neoteric drilling fluid system in surface has good rheological, and moving speed ratio surpassed for 0.7 (general requirement surpasses 0.5), can successfully take landwaste out of fully, kept well totally unimpeded.
Example 3
Example 3 is by the two potassium ions of above-mentioned strong inhibition of having invented-polymer drilling fluid new system, and its prescription composition sees Table 3. described prescription composition in 6, prepares at the scene according to above-mentioned preparation procedure.Carried out the test in place of 2 mouthfuls of wells, wherein two flat 18-3 application, obtain good result equally and see Table 7.
In the application of 3 examples, it is anti-collapse that this system shows good inhibition equally, lubricated, low solid phase, and high drilling speed, average rate of penetration are all at 5 meters/hour.Well is good in the drilling process, and the down-hole is normal all the time, electrical measurement after the finishing drilling, well rule.Table 11, table 12 have been described example 2, the property of drilling fluid that example 3 is used at the scene.
Table 11: example 2 is in flat 16-14 application unexpectedly
| Well depth (m) | Density (g/cm 3) | FV (second) | PV (CP) | YP (1bf/100ft 2) | FL(m1/ 30min) | PH | Hole deviation (degree) |
| 629 | 1.03 | 51 | 14 | 16 | 10.5 | 9.5 | 5.3 |
| 652 | 1.04 | 51 | 14 | 14 | 10 | 10.0 | 10.9 |
| 854 | 1.035 | 42 | 10 | 5 | 10 | 10.0 | 14.2 |
| 1123 | 1.03 | 41 | 9 | 7 | 9.4 | 9.0 | 17.9 |
| 1242 | 1.035 | 44 | 11 | 10 | 8.5 | 10.0 | 20.8 |
| 1482 | 1.06/ | 42 | 10 | 12 | 7.6 | 9.5 | 22.1 |
| 1636 | 1.07 | 42 | 12 | 8 | 6.4 | 9.5 | 25.0 |
| 1680 | 1.07 | 45 | 12 | 15 | 6 | 9.5 | 33.8 |
| 1680 | 1.07 | 48 | 13 | 17 | 6.2 | 9.5 | 34.5 |
| 1757 | 1.07 | 45 | 12 | 14 | 6 | 10.0 | 36.0 |
| 1931 | 1.06 | 46 | 12 | 16 | 5.8 | 10.0 | 41.2 |
| 1983 | 1.07 | 49 | 13 | 16 | 5.6 | 10.0 | 46.1 |
| 2032 | 1.07 | 45 | 13 | 17 | 5.8 | 9.5 | 49.7 |
| 2184 | 1.07 | 50 | 15 | 19 | 5.6 | 10.0 | 53.8 |
| 2246 | 1.075 | 53 | 14 | 25 | 5.6 | 9.5 | 53.8 |
| 2342 | 1.075 | 50 | 13 | 25 | 5.4 | 10.0 | 62.2 |
| 2418 | 1.09 | 50 | 13 | 24 | 5.2 | 9.5 | 68.7 |
| 2500 | 1.09 | 52 | 13 | 28 | 5.6 | 9.5 | 73.7 |
| 2623 | 1.13 | 53 | 13 | 26 | 5.3 | 10.0 | 73.7 |
| 2711 | 1.16 | 56 | 15 | 24 | 5.4 | 10.0 | 78.3 |
| 2771 | 1.165 | 65 | 15 | 33 | 4.9 | 10.0 | 79.0 |
| 2815 | 1.16 | 67 | 15 | 35 | 5.2 | 9.5 | 79.0 |
| 2969 | 1.16 | 73 | 18 | 31 | 4.5 | 9.5 | 79.0 |
| 3138 | 1.16 | 68 | 14 | 34 | 5 | 10.0 | 79.0 |
| 3222 | 1.16 | 72 | 18 | 34 | 5.2 | 9.0 | 79.7 |
| 3323 | 1.165 | 73 | 17 | 41 | 5 | 9.5 | 79.8 |
| 3391 | 1.165 | 81 | 19 | 56 | 4.7 | 9.0 | 80.0 |
| 3421 | 1.165 | 85 | 20 | 54 | 5.2 | 9.5 | 80.2 |
| 3450 | 1.16 | 82 | 18 | 51 | 4.8 | 10.0 | 80.2 |
| 3482 | 1.165 | 85 | 19 | 54 | 5 | 9.5 | 81.3 |
| 3503 | 1.16 | 83 | 20 | 49 | 4.8 | 9.5 | 87.3 |
| 3517 | 1.16 | 86 | 20 | 53 | 5 | 9.5 | 88.0 |
| 3531 | 1.16 | 82 | 20 | 50 | 5 | 9.5 | 88.0 |
| 3544 | 1.16 | 83 | 21 | 48 | 5 | 9.5 | 88.0 |
| 3564 | 1.165 | 78 | 18 | 48 | 4.8 | 9.0 | 88.0 |
| 3571 | 1.165 | 82 | 19 | 51 | 4.9 | 10.0 | 88.0 |
Table 12: example 3 is in two 18-3 application
| Well depth m | Density g/cm3 | FV (second) | PV (CP) | YP (lbf/100ft 2) | 6rpm | FL(ml/ 30min) | pH |
| 148 | 10.09 | 32 | 7 | 3 | 2 | 11.2 | 8.5 |
| 248 | 10.09 | 34 | 6 | 5 | 2 | 12.0 | 8.5 |
| 316 | 10.09 | 34 | 6 | 5 | 2 | 10.8 | 8.5 |
| 338 | 10.09 | 35 | 6 | 5 | 2 | 10.5 | 8.5 |
| 495 | 10.09 | 45 | 10 | 6 | 6 | 10..5 | 8.5 |
| 600 | 10.09 | 51 | 9 | 8 | 6 | 10..2 | 8.5 |
| 688 | 10.09 | 57 | 9 | 10 | 7 | 10.0 | 8.5 |
| 825.2 | 10.19 | 42 | 10 | 11 | 5 | 9.3 | 10.5 |
| 1018.8 | 10.29 | 41 | 10 | 11 | 5 | 8.5 | 10.5 |
| 1286 | 10.49 | 46 | 15 | 21 | 7 | 7.8 | 10 |
| 1372 | 10.58 | 47 | 15 | 24 | 8 | 7 | 10.5 |
| 1459 | 10.68 | 48 | 16 | 25 | 8 | 6.2 | 10.5 |
| 1514 | 10.78 | 50 | 16 | 27 | 8.5 | 5.6 | 10 |
| 1581 | 10.78 | 57 | 18 | 33 | 10 | 5.2 | 10 |
| 1619 | 10.78 | 61 | 19 | 33 | 10 | 5 | 10 |
| 1710 | 10.58 | 53 | 17 | 29 | 10 | 5.2 | 10 |
| 1846 | 10.58 | 54 | 17 | 31 | 12 | 5 | 10.5 |
| 1920 | 10.58 | 62 | 17 | 44 | 14 | 5 | 10.5 |
| 1989 | 10.58 | 56 | 17 | 38 | 13 | 5 | 10 |
| 2045 | 10.88 | 51 | 14 | 36 | 11 | 5.4 | 10 |
| 2090 | 10.88 | 50 | 14 | 33 | 10.5 | 5.6 | 10.5 |
| 2140 | 10.88 | 50 | 15 | 35 | 11 | 5.4 | 10.5 |
| 2198 | 10.88 | 49 | 15 | 33 | 10.5 | 5.2 | 10.5 |
| 2260 | 10.88 | 54 | 15 | 38 | 12 | 5.1 | 10 |
| 2284 | 10.88 | 56 | 15 | 39 | 13 | 5 | 10.5 |
| 2301 | 10.88 | 55 | 15 | 33 | 11 | 5.2 | 10.5 |
| 2392 | 10.78 | 68 | 15 | 35 | 13 | 5 | 10.5 |
| 2502 | 10.78 | 65 | 15 | 41 | 14 | 5.2 | 10.5 |
| 2587 | 10.78 | 68 | 15 | 44 | 15 | 5 | 10 |
| 2625 | 10.88 | 56 | 14 | 40 | 13.5 | 5.2 | 10 |
| 2650 | 10.88 | 62 | 15 | 38 | 12 | 5.2 | 10 |
| 2806 | 10.88 | 67 | 17 | 37 | 13 | 5 | 10.5 |
| 2849 | 11.17 | 69 | 18 | 43 | 14 | 5 | 10.5 |
| 2910 | 11.17 | 58 | 18 | 37 | 13 | 5 | 10.5 |
| 2974.5 | 11.17 | 58 | 18 | 41 | 14 | 5 | 10.5 |
| 3009.68 | 11.22 | 68 | 17 | 40 | 14 | 4.8 | 10.5 |
| 3064.28 | 11.47 | 80 | 19 | 47 | 17 | 4.7 | 10.5 |
| 3157.23 | 11.51 | 67 | 21 | 37 | 16 | 4.7 | 10.5 |
| 3198.2 | 11.51 | 66 | 21 | 38 | 16.5 | 4.8 | 10.5 |
| 3224.02 | 11.51 | 70 | 18 | 38 | 15 | 4.6 | 10.5 |
| 3259.8 | 11.51 | 76 | 19 | 45 | 18 | 4.6 | 10.5 |
| 3306 | 11.51 | 69 | 18 | 45 | 17 | 4.7 | 10.5 |
| 3332.19 | 11.51 | 65 | 17 | 43 | 16 | 4.7 | 10.5 |
| 3348.46 | 11.56 | 65 | 16 | 43 | 15.5 | 4.8 | 10.5 |
| 3410 | 11.51 | 61 | 16 | 40 | 13 | 4.8 | 10.5 |
Annotate: FV: funnel viscosity
PV: plastic viscosity
YP:: yield value
PH: basicity
FL: filter loss
6rpm: reading is changeed in six speed rotations 6.
Claims (10)
1, a kind of di-kalium ion-polymer drilling fluid with strong rejection capability is characterized in that: di-kalium ion-polymer drilling fluid with strong rejection capability comprises the material of following weight per-cent:
A, as the inorganic potassium salt 7%-9% of inorganic inhibitor;
B, as the potassium salt 0.5%-0.6% of organic inhibitor;
C, carry stick 0.3%-0.5%;
D, fluid loss agent 0.3%-0.5%;
E, alkalinity control agent 0.3%-0.5%;
F, sanitas 0.03%-0.1%;
G, defoamer 0.1%-0.2%;
H, weighting agent 1%-8%;
Surplus is a water.
2, a kind of di-kalium ion-polymer drilling fluid with strong rejection capability according to claim 1 is characterized in that: described inorganic potassium salt is that Repone K or vitriolate of tartar or saltpetre are at the interior inorganic salt that potassium ion can be provided.
3, a kind of di-kalium ion-polymer drilling fluid with strong rejection capability according to claim 1 is characterized in that: described potassium salt is that polyacrylic acid potassium or potassium formiate or potassium acetate are at interior organic salt with potassium ion functional group.
4, a kind of di-kalium ion-polymer drilling fluid with strong rejection capability according to claim 1 is characterized in that: the described stick of carrying is xanthan gum or melon glue.
5, a kind of di-kalium ion-polymer drilling fluid with strong rejection capability according to claim 1 is characterized in that: described fluid loss agent is high adhesive aggregation anionic cellulose, low adhesive aggregation anionic cellulose, high sticking carboxymethyl cellulose, low sticking carboxymethyl cellulose, starch based at interior one or both.
6, a kind of di-kalium ion-polymer drilling fluid with strong rejection capability according to claim 1 is characterized in that: described alkalinity control agent is sodium hydroxide or potassium hydroxide or calcium hydroxide.
7, a kind of di-kalium ion-polymer drilling fluid with strong rejection capability according to claim 1 is characterized in that: described sanitas is a kind of in formaldehyde or the glutaraldehyde.
8, a kind of di-kalium ion-polymer drilling fluid with strong rejection capability according to claim 1 is characterized in that: described defoamer is silicone antifoam agent or polyether antifoam agent.
9, a kind of di-kalium ion-polymer drilling fluid with strong rejection capability according to claim 1 is characterized in that: described weighting agent is a kind of in barite part or the powdered iron ore.
10, a kind of di-kalium ion-polymer drilling fluid with strong rejection capability according to claim 1 is characterized in that: described di-kalium ion-polymer drilling fluid with strong rejection capability is that the compound by aforementioned proportion carries out according to following program at normal temperatures and pressures:
1) pack in the slurry commanding tank at the scene clear water of said ratio;
2) a kind of, a kind of stick, one or both fluid loss agents carried of the organic inhibitor of said ratio added successively in the clear water in the step 1) and mix;
3) add a kind of inorganic salt inhibitor of aforementioned proportion again, stir it is fully dissolved;
4) add a kind of weighting agent of aforementioned proportion, a kind of sanitas, a kind of defoamer, stirring and dissolving more respectively;
5) a kind of alkalinity control agent with aforementioned proportion is adjusted to 9-10 with PH.
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| CN102051159A (en) * | 2010-11-19 | 2011-05-11 | 原玉红 | Suspension salt well completion fluid |
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| CN103045191B (en) * | 2012-12-11 | 2015-07-08 | 中国石油集团川庆钻探工程有限公司 | Low-corrosion low-solid phase high-inhibition drilling fluid and preparation method thereof |
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| CN110734747B (en) * | 2018-07-18 | 2022-07-08 | 中石化石油工程技术服务有限公司 | Potassium nitrate drilling fluid and preparation method thereof |
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| CN110028940B (en) * | 2019-04-30 | 2021-05-18 | 中国石油集团川庆钻探工程有限公司 | Strong-inhibition di-potassium amino ion polymer drilling fluid and preparation method thereof |
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| CN111139048A (en) * | 2020-01-10 | 2020-05-12 | 青海煤炭地质一0五勘探队 | Potassium-based cation flushing fluid for coal-based stratum drilling and preparation method thereof |
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