CN105735968A - Leakage plugging effect evaluation method for permeable leakage - Google Patents
Leakage plugging effect evaluation method for permeable leakage Download PDFInfo
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- 230000000694 effects Effects 0.000 title claims abstract description 46
- 238000011156 evaluation Methods 0.000 title claims abstract description 24
- 230000035699 permeability Effects 0.000 claims abstract description 85
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 41
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 26
- 235000019738 Limestone Nutrition 0.000 claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000006028 limestone Substances 0.000 claims abstract description 20
- 239000006004 Quartz sand Substances 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 239000010802 sludge Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 230000000903 blocking effect Effects 0.000 claims description 40
- 238000007789 sealing Methods 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 24
- 238000005266 casting Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 16
- 238000003556 assay Methods 0.000 claims description 13
- 235000019580 granularity Nutrition 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 238000004088 simulation Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 238000009472 formulation Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract description 2
- 239000004576 sand Substances 0.000 abstract description 2
- 229910001873 dinitrogen Inorganic materials 0.000 abstract 2
- 238000004154 testing of material Methods 0.000 abstract 2
- 239000002245 particle Substances 0.000 description 14
- 239000002002 slurry Substances 0.000 description 13
- 238000005553 drilling Methods 0.000 description 12
- 239000012530 fluid Substances 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- 239000000440 bentonite Substances 0.000 description 5
- 229910000278 bentonite Inorganic materials 0.000 description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- 239000011148 porous material Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229920002472 Starch Polymers 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000011026 diafiltration Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000004531 microgranule Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/005—Monitoring or checking of cementation quality or level
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Quality & Reliability (AREA)
- Geophysics (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses a leakage plugging effect evaluation method for permeable leakage. The leakage plugging effect evaluation method is achieved through a leakage plugging material testing device. The leakage plugging material testing device is mainly composed of a nitrogen gas cylinder, a sludge barrel, a leakage layer cup and a collecting barrel. A top cover is arranged on the upper portion of the sludge barrel, a leakage layer cup base is arranged on the lower portion of the sludge barrel. The top cover is connected with the nitrogen gas cylinder and provided with an air inlet stem valve and a pressure release valve. The leakage layer cup base is connected with the collecting barrel through an output connector and provided with the leakage layer cup. The leakage layer cup is sequentially filled with coarse-granularity, medium-granularity and fine-granularity limestone or coarse-granularity, medium-granularity and fine-granularity quartz sand from bottom to top to form a permeable sand bed which simulates high-porosity and high-permeability sandstone and glutenite strata. According to the leakage plugging effect evaluation method for permeable leakage, leakage plugging testing is conducted on leakage plugging agents with different formulas under different pressure, and the leakage plugging effect of permeable leakage is comprehensively examined and evaluated according to the influence of the instantaneous leakage amount, the total leakage amount, the plugging layer pressure-bearing capacity, the plugging layer disruptive pressure and the plugging layer secondary clear water filtration loss and pressure on the plugging layer permeability.
Description
Art
The present invention relates to the plugging effect evaluation methodology of wellbore construction middle and high infiltration stratum permeability leakage in petroleum works field.
Background technology
In oil gas well drilling construction, it is frequently run onto Gao Konggao and oozes sandstone, glutenite stratum, the down hole problem of drilling fluid permeability loss, the drilling fluid that consume is expensive occur, increases drilling cost.The method generally tackling permeability loss is to add the fine grained loss circulation material of organic or inorganic in drilling fluid, utilize graininess loss circulation material to enter Gao Konggao under differential pressure action and ooze stratum, blocking pore constriction, form colmatation zone, reduce hole permeability, bentonite and heavy weight additive microgranule in drilling fluid cover under filtration and form more fine and close mud cake on colmatation zone, thus stoping the permeability loss of drilling fluid.Desk research and the plugging effect evaluating permeability loss are the key technology means screening permeability loss sealing agent, are also the scientific basics of field conduct permeability loss blocking construction.
Plugging effect evaluation means conventional at present is to adopt QD-2 loss circulation material assay device.This plugging effect evaluating apparatus is the hole of crack and the different pore size being respectively adopted man-made fracture seam plate and two kinds of size drop ply simulation different in width of size, it is possible to evaluate the plugging effect of the higher slit formation of leak-off velocity and hole type formation leakage preferably.But because its crack and bore hole size are relatively big, the little granule sealing agent meeting permeability loss leak stopping requirement cannot form colmatation zone, it is impossible to evaluates the plugging effect of permeability loss.And the material of simulation drop ply is steel, leakage face is relatively smooth, differs greatly with the sandstone of permeability loss, glutenite rough surface, is not therefore suitable for the plugging effect evaluation of permeability loss.
Owing to used leak stopping evaluation method is missed and hole type leakage with man-made fracture and steel ball simulation fracture type, carry out plugging effect evaluation, it is only applicable to the bridge joint plugging test that leakage channel is relatively big, sealing agent is thicker, and the plugging test of permeability loss can not be carried out, it is suitable for, but without a set of, the effective ways that permeability loss plugging effect is evaluated so far.
The present invention oozes, by introducing in QD-2 loss circulation material assay device, the permeability casting bed model that sandstone permeability loss stratum is similar to Gao Konggao, set up the plugging effect evaluation methodology of permeability loss, the problem solving permeability loss plugging effect evaluation means disappearance, belongs to the improvement invention on original QD-2 loss circulation material assay device basis.The foundation of the method has good directive function for the research and development of permeability loss sealing agent and the on-the-spot blocking construction of permeability loss.
Summary of the invention
It is an object of the invention to provide permeability loss plugging effect evaluation methodology, the method is by preparing permeability casting bed, simulation Gao Konggao oozes sandstone or glutenite leakage stratum, utilize QD-2 loss circulation material assay device, under examination different pressures, wastage and pressure, the relation of time, thus permeability loss plugging effect is evaluated, also evaluation and screening for permeability loss sealing agent provide reliable ways and means.
In order to reach above-mentioned technical purpose, the present invention provides techniques below scheme.
Permeability loss plugging effect evaluation methodology, the method utilizes loss circulation material assay device to be achieved, described loss circulation material assay device is mainly by nitrogen cylinder, sludge barrel, drop ply cup, surge drum forms, top cover is arranged at described sludge barrel top, drop ply cup is arranged at bottom, described top cover connects nitrogen cylinder, top cover has air inlet stem valve and relief valve, described drop ply cup connects surge drum by out splice going splice, drop ply cup has drop ply cup, in described drop ply cup, it is sequentially loaded into thick from top to bottom, in, the limestone of thin three kinds of granularities or quartz sand, composition simulation Gao Konggao oozes sandstone, the permeability casting bed on glutenite stratum.
Described permeability casting bed, forming process is as follows: at the steel wire gauze embedding one layer of 20 order at the bottom of drop ply cup, it is sequentially loaded into granular limestone or the quartz sand 100 grams of 5～8 orders (particle diameter 2.36～4mm) again, the middle lime stone of 10～20 orders (particle diameter 0.85～2.0mm) or quartz sand 30 grams, the fine grained limestone of 20～40 orders (particle diameter 0.425～0.85mm) or quartz sand 20 grams.
The present invention is by the permeability casting bed of varigrained limestone or quartz sand particle composition, sealing agent penetrates casting bed and forms fine and close blocking layer under stress, by at various pressures the sealing agent of different formulations being carried out plugging test, according to instantaneous wastage, leakage total amount, blocking layer bearing capacity, blocking layer disruptive pressure, blocking layer secondary clear water filter loss and the pressure impact on blocking layer permeability, investigate comprehensively and evaluate the plugging effect of permeability loss.
Instantaneous wastage refers under 1MPa pressure, opens the mud amount of ball valve moment leakage.
Leakage total amount refers to and starts timing after opening ball valve, according to 1MPa/min raised pressure to 6MPa (5min), then after voltage stabilizing 5min, and the wastage of accumulative (10min).
Blocking layer bearing capacity is during the voltage stabilizing of the finger pressure boost process from 1MPa～6MPa and 6MPa, the situation that wastage is amplified suddenly does not occur, then it is assumed that bearing capacity >=6MPa.
Blocking layer disruptive pressure refers in boost process, amplifies suddenly to certain pressure wastage, then it is assumed that this pressure is the disruptive pressure of blocking layer.In this case, the bearing capacity < disruptive pressure of blocking layer.
After blocking layer secondary clear water filter loss refers to that leaking stoppage experiment completes, extract leak stopping slurry out, test leak stopping layer filter loss at various pressures with clear water, thus can calculate the permeability of leak stopping layer and the impact that pressure is on blocking layer permeability.
The present invention compared with prior art, has the advantages that
The present invention adopts the limestone particle of different grain size grating to replace steel ball composition permeability casting bed, the simulation sandstone of high osmosis, glutenite stratum, evaluate the plugging effect of permeability loss sealing agent, solve the deficiency that existing method can only be evaluated crack and hole type leakage and cannot evaluate permeability loss.
The present invention can directly calculate the permeability of blocking layer, quantifies plugging effect.In addition employing is close with high seepage lost territory composition of layer limestone, quartz sand particle simulate drop ply, and plugging test condition is closer to the true stratum of Thief zone, and on-the-spot blocking construction is had better directive function by the evaluation of plugging effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of loss circulation material assay device.
Fig. 2 is drop ply cup and permeability casting bed structural representation.
In figure: 1, nitrogen cylinder, 2, sludge barrel, 3, drop ply cup, 4, surge drum, 5, top cover, 6, drop ply cup, 7, air inlet stem valve, 8, relief valve, 9, ball valve, 10, out splice going splice, 11, O-ring seal, 12, drilled base plate.
Fig. 3 is the impact on plugging effect of the sealing agent dosage.
Detailed description of the invention
The present invention is further illustrated below according to drawings and Examples.
Permeability loss plugging effect evaluation methodology, the method utilizes loss circulation material assay device to be achieved, described loss circulation material assay device (see Fig. 1) is main by nitrogen cylinder 1, sludge barrel 2, drop ply cup 3, surge drum 4 forms, top cover 5 is arranged at described sludge barrel 2 top, drop ply cup 6 is arranged at bottom, described top cover connects nitrogen cylinder 1, top cover has air inlet stem valve 7 and relief valve 8, described drop ply cup connects surge drum 4 by ball valve 9 and out splice going splice 10, drop ply cup has drop ply cup 3, in described drop ply cup, it is sequentially loaded into thick from top to bottom, in, the limestone of thin three kinds of granularities or quartz sand, composition simulation Gao Konggao oozes sandstone, the permeability casting bed (see Fig. 2) on glutenite stratum, it it is drilled base plate 12 at the bottom of drop ply cup, drop ply cup top is O-ring seal 11.
Described permeability casting bed forming process is as follows: at the steel wire gauze embedding one layer of 20 order at the bottom of drop ply cup, it is sequentially loaded into granular limestone or the quartz sand 100 grams of 5～8 orders (particle diameter 2.36～4mm) again, the middle lime stone of 10～20 orders (particle diameter 0.85～2.0mm) or quartz sand 30 grams, the fine grained limestone of 20～40 orders (particle diameter 0.425～0.85mm) or quartz sand 20 grams.
Utilize above-mentioned osmosis type casting bed to carry out permeability loss plugging effect evaluation, comprise the following steps successively:
(1) the preparation of bentonite slurry: measure in the drilling fluid cup that 2000ml capacity poured into by 1000ml tap water, under 1500 revs/min of stirring conditions, it is slowly added to soda 2g and bentonite 50g, after continuing stirring 10 minutes, 10000 revs/min of shear agitation 2 minutes under high speed agitator, stand aquation more than 16 hours.
(2) the preparation of leak stopping slurry: with above-mentioned bentonite slurry 1000ml, 0.3% polymeric viscosifiers slowly it is uniformly added under 1500 turns/min stirring condition, continue stirring 10min, be then slowly homogeneously added into 3% permeability loss sealing agent, after continuing stirring 10min, next step leaking stoppage experiment can be carried out.
(3) the preparation of permeability casting bed: at the steel wire gauze embedding one layer of 20 order at the bottom of the drop ply cup of leak stopping instrument, load the granular limestone (or quartz sand) 100 grams of 5～8 orders (particle diameter 2.36～4mm), slight wobble is shaken 10 seconds, forms the bed course being highly about 2cm.30 grams of lime stone (or quartz sand) in 10～20 orders (particle diameter 0.85～2.0mm) on uniform spreading on bed course, slight wobble is shaken 10 seconds, 20 grams of 20～40 orders (particle diameter 0.425～0.85mm) fine grained limestone (or quartz sand) on uniform spreading again, it is completely covered in middle level lime stone, slight wobble is shaken 10 seconds, makes sand pack closely knit.
(4) the leakage inspection of casting bed simulation drop ply: starch with the base with sealing agent, namely soil content is the bentonite slurry 1000ml of 5%, 0.3% polymeric viscosifiers slowly it is uniformly added under 1500 turns/min stirring condition, continue stirring 10min, pour into and loss circulation material assay device carries out leakage test, under 1MPa pressure, after opening ball valve, instantaneous total loss starched by base.
(5) plugging effect evaluation experimental: 1. handle with care in loss circulation material assay device cup by the drop ply cup with casting bed, closes ball valve.2. leak stopping slurry is poured in sludge barrel along sludge barrel inwall, on leak stopping is starched, cover 3000ml tap water.Tap water should be poured slowly into along sludge barrel inwall, in order to avoid rushing rare mixing leak stopping slurry.3. top cover screwing, is connected nitrogen cylinder high-pressure hose connector with the air inlet valve lever on top cover.4. opening nitrogen cylinder main valve, regulating air relief valve is 1.0MPa to pressure, opens the air inlet valve lever on top cover.5. open ball valve, start stopwatch record time and instantaneous wastage immediately, then improve pressure with the speed of 1.0MPa/min, and observed and recorded 2,3,4,5, the accumulative wastage of 6MPa, pressure after 6MPa, voltage stabilizing 5 minutes, and record leakage total amount.6. after leak stopping completes, close nitrogen cylinder valve, unclamp air relief valve, open the relief valve venting on leak stopping instrument top cover, turn on top cover, the clear water in sludge barrel and residue leak stopping slurry are extracted out, takes out drop ply cup, clean plugging test device.
(6) blocking layer compactness evaluation experimental: 1. with clear water, the blocking layer surface leak stopping slurry formed in drop ply cup after plugging test is washed, and drop ply cup is reentered in cup.2. it is poured slowly into 4000ml tap water along sludge barrel outer wall.3. top cover screwing, is connected nitrogen cylinder high-pressure hose connector with the air inlet valve lever on top cover.4. opening nitrogen cylinder main valve, regulating air relief valve is 1.0MPa to pressure, opens the air inlet valve lever on top cover.5. open ball valve, start the stopwatch record time immediately, after 5min, record clear water filter loss, then with the speed raising pressure of 1.0MPa/min to 6MPa, the record time, record clear water filter loss after voltage stabilizing 5min, the blocking layer clear water permeability under 1MPa and 6MPa can be calculated according to Darcy formula respectively.
Plugging effect evaluation index:
1. instantaneous wastage < 100ml, total wastage < 200ml, plugging effect is good；
2. instantaneous wastage > 150ml, total wastage > 300ml, plugging effect difference or leak stopping are invalid；
3. instantaneous wastage > 200ml, total wastage > 500ml, leak stopping is invalid；
4. drop ply clear water permeability < 5mD, blocking layer compactness is good；
5. permeability under clear water permeability < 1MPa under drop ply 6MPa, blocking layer compressibility is good；
6., in boost process, amplify as run into wastage moment, be drop ply breakdown, record disruptive pressure.If disruptive pressure < 5MPa, then it is assumed that blocking layer bearing capacity is not enough.
Embodiment 1 simulates permeability drop ply leakage test
Starch and add the leak stopping slurry of sealing agent respectively with the base with sealing agent, compound formulation and leakage test step according to aforementioned analog permeability drop ply are tested, and check the leakage of simulation drop ply and the effectiveness of sealing agent.Result is in Table 1.
The leakage test of drop ply simulated by table 1
Note: A is granularity is the permeability sealing agent of 80 orders (0.18mm), and B is granularity is the permeability sealing agent of 120 orders (0.125mm).
As can be seen from Table 1, simulation permeability drop ply is not added with in sealing agent situation at base slurry, and instantaneous total loss substantially can react height and ooze the leakage situation on stratum.Adding the leak stopping slurry of sealing agent, instantaneous wastage and total wastage all drop to very low, have reacted the plugging effect of sealing agent well.
The impact on plugging effect of the embodiment 2 sealing agent granularity
Carry out leaking stoppage experiment with varigrained sealing agent respectively, evaluate the impact on plugging effect of the sealing agent granularity.Result is in Table 2.
The impact on plugging effect of table 2 particle diameter
Note: A is granularity is the permeability sealing agent of 80 orders (0.18mm), and B is granularity is the permeability sealing agent of 120 orders (0.125mm), and C is granularity is the permeability sealing agent of 200 orders (0.074mm).
Table 2 data show, plugging effect is had a direct impact by permeability loss sealing agent granularity, and when granularity is too low, sealing agent is inadequate with drop ply aperture matching degree, and under high pressure effect, sealing agent granule can penetrate drop ply, and blocking layer is breakdown, leak stopping failure.As excessive in sealing agent granularity, then the colmatation zone compactness formed is slightly poor.Type B sealing agent effect is best relatively.
The impact on plugging effect of the embodiment 3 sealing agent dosage
Use Type B sealing agent, under different dosages, carry out plugging test, evaluate the impact on plugging effect of the sealing agent dosage.Result is in Table 3 and Fig. 3.
The impact on plugging effect of the table 3 sealing agent dosage
Table 3 and Fig. 3 show, increase with sealing agent dosage, and initial wastage and total wastage are all greatly reduced, and plugging effect is obviously enhanced.In addition effective dosage of sealing agent cannot be below 2%, and optimum add amount is 3%.
Embodiment 4 blocking layer testing permeability
For detecting the compactness of blocking layer, leaking stoppage experiment extracts the leak stopping slurry in sludge barrel out after completing, replace with clear water, applied voltage test clear water filter loss, record time, pressure and filter loss, can calculate and obtain blocking layer permeability.Result is in Table 4.
Table 4 blocking layer permeability test
Note: the data of 10min under 5min and 6.0MPa pressure under clear water filter loss respectively 1.0MPa pressure, calculated permeability should be the permeability under 1.0MPa and 6.0MPa pressure mutually.
According to Darcy formulaThe permeability obtaining blocking layer can be calculated.Wherein:
Q is under pressure reduction △ P, by the flow of blocking layer, cm3/s。
A blocking layer area, cm2, the present embodiment is 36.3cm2；
The △ P fluid pressure differential by blocking layer, 10-1MPa；
L blocking layer thickness, cm, the present embodiment is 0.3cm；
μ fluid viscosity, mPa s
K permeability, μm2。
According to the China's oil industry standard (SY/T6169-1995) division to reservoir permeability, permeability > 500mD is high-permeability reservoir, and permeability 50～500mD is middle permeability formation.And permeability loss mostly occurs in the high-permeability reservoir of permeability > 500mD and permeability on the medium to high permeable stratum of 200～500mD.Being tested by the method for the invention, the blocking layer permeability of formation is low to moderate 0.5～2.8mD, by two orders of magnitude of permeability reduction of high seepage lost territory layer, divides the extra-low permeability formation volumes belonging to < 10mD by permeability.This has reacted the leak stopping principle of permeability loss, namely by adding little granule sealing agent in drilling fluid, in the moment boring layer formation well of turning up the soil, under differential pressure action, the little granule sealing agent in drilling fluid enters high seepage and loses formation pore, quickly forms the blocking layer of densification at nearly borehole wall position, along with in drilling fluid, the more fine grained diafiltration such as clay particle, heavy weight additive deposits on blocking layer, forming more fine and close mud cake, thus stoping the drilling fluid loss to stratum, reaching the purpose of leak stopping.
Claims (3)
- null1. permeability loss plugging effect evaluation methodology，The method utilizes loss circulation material assay device to be achieved，Described loss circulation material assay device is mainly by nitrogen cylinder (1)、Sludge barrel (2)、Drop ply cup (3)、Surge drum (4) forms，Top cover (5) is arranged at described sludge barrel (2) top，Drop ply cup (6) is arranged at bottom，Described top cover connects nitrogen cylinder (1)，Top cover has air inlet stem valve (7) and relief valve (8)，Described drop ply cup connects surge drum (4) by ball valve (9) and out splice going splice (10)，Drop ply cup has drop ply cup (3)，It is characterized in that，In described drop ply cup，It is sequentially loaded into thick from top to bottom、In、The limestone of thin three kinds of granularities or quartz sand，Composition simulation Gao Konggao oozes sandstone、The permeability casting bed on glutenite stratum，It it is drilled base plate (12) at the bottom of drop ply cup，Drop ply cup top is O-ring seal (11).
- 2. permeability loss plugging effect evaluation methodology as claimed in claim 1, it is characterized in that, described permeability casting bed forming process is as follows: at the steel wire gauze embedding one layer of 20 order at the bottom of drop ply cup, it is sequentially loaded into granular limestone or the quartz sand 100 grams of 5～8 orders again, lime stone or quartz sand 30 grams in 10～20 purposes, the fine grained limestone of 20～40 orders or quartz sand 20 grams.
- 3. permeability loss plugging effect evaluation methodology as claimed in claim 1, it is characterized in that, sealing agent penetrates described permeability casting bed and forms fine and close blocking layer under stress, by at various pressures the sealing agent of different formulations being carried out plugging test, according to instantaneous wastage, leakage total amount, blocking layer bearing capacity, blocking layer disruptive pressure, blocking layer secondary clear water filter loss and the pressure impact on blocking layer permeability, investigate comprehensively and evaluate the plugging effect of permeability loss.
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| CN109707338A (en) * | 2019-01-12 | 2019-05-03 | 李子杲 | The method of leak stopping after being missed in drilling process |
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| CN110431416A (en) * | 2017-03-16 | 2019-11-08 | 沙特阿拉伯石油公司 | Equipment for plugging material Performance Evaluation |
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