CN101881708B - Sand core test piece used for testing performance of drilling fluid and preparation and application thereof - Google Patents
Sand core test piece used for testing performance of drilling fluid and preparation and application thereof Download PDFInfo
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- CN101881708B CN101881708B CN2010102027227A CN201010202722A CN101881708B CN 101881708 B CN101881708 B CN 101881708B CN 2010102027227 A CN2010102027227 A CN 2010102027227A CN 201010202722 A CN201010202722 A CN 201010202722A CN 101881708 B CN101881708 B CN 101881708B
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Abstract
The invention relates to a sand core test piece used for testing the performance of drilling fluid and preparation and application thereof. The sand core test piece consists of a sand sheet and gasket integrated structure. In the sand core test piece, a sand sheet prepared by pressing sand or a natural slabbed core is taken as a leakage medium, and is sealed in a filter press through the gasket to test the infiltration performance of the drilling fluid; meanwhile, the sand core test piece can be washed repeatedly, so the permeability recovery of the sand core test piece is evaluated and the utilization rate of the testing instrument is improved.
Description
Technical field
The invention belongs to the petroleum engineering technical field, relate to a kind of property of drilling fluid and detect servicing unit, specifically detect the sand core test piece that drilling fluid filtration is used.
Background technology
In the process of drilling well, the borehole wall is the important evaluation to drilling process to the leak-off of drilling fluid.Filter loss is that the appraisal drilling fluidity can basically the most also be one of most important index.Therefore, the whether accurate quality that directly has influence on drilling quality of drilling fluid filtration measurement.But in decades, filter paper is the leakage medium of measuring drilling fluid filter loss always.And the hole of filter paper is a homogeneous, and formation pore is a heterogeneous body, so the measuring method of this drilling fluid filtration can not accurately reflect the actual conditions on stratum.
For better simulation stratum condition, casting bed commonly used at present or core filtration device are measured property of drilling fluid, and it is to realize through the sand of the certain order number of filling in filtration device or clamping rock core.More or less all there is certain problem in this type filtration device, can not instead arrange experiment such as what have, and test index is single, and the complex structure that has need add confined pressure to rock core.And they all can not be analyzed the additive for drilling fluid mechanism of action from microcosmic.CN200972444 (200620137227.1) discloses a kind of high pressure sand-bed filtration appearance, is used to estimate the seepage effect of not having infiltration additive for drilling fluid and drilling fluid system thereof.The present invention is made up of hand oil pump, tensimeter and drilling well fluid cylinder three parts.This device can use casting bed as leakage medium, measures the drilling fluid filtration characteristic, and more traditional leakage medium filter paper is more true to nature to the simulation of down-hole situation.With the pressure source of hydraulic pump as this device, broken through classic method with nitrogen cylinder the limited deficiency of pressure during as pressure source, can test pressure be risen to more than the 40MPa by 1MPa, can adjust according to the test needs.The technical scheme of this patent document be exactly the back-up sand (casting bed) of usefulness as leakage medium, can only survey filter loss, can not carry out back flush, the test restorability.
Summary of the invention
In order to overcome the defective that existing filtration device exists in testing performance of drilling fluid, the present invention provides a kind of sand core test piece, and not only better simulated formation improves test accuracy, but also can be used for test of perviousness restorability and microcosmic Mechanism Analysis.
Technical scheme of the present invention is following:
A kind of sand core test piece is made up of sand sheet and packing ring, and said sand sheet and packing ring are integrative-structures.
Preferably, said sand sheet is circular, and said packing ring is a ring washer.Said packing ring is rubber or plastic material, also can be metal materials such as stainless steel, aluminium or iron.
Preferably, said sand sheet is a compacting sand sheet, and said packing ring embeds in the edge of sand sheet, is when the sand sheet is made, with sheeter mortar and packing ring to be suppressed all-in-one-piece.Further preferred, said packing ring is positioned at the centre of sand sheet thickness, when being convenient on filtration device, use with its on the sealing of O-ring seal and lower end spill end cap.Preferably, 6～12mm in the edge of said packing ring embedding sand sheet.
The another kind of optimal way of sand core test piece of the present invention is that said sand sheet is the section of natural core, and the section and the ring washer gluing of natural core is into a single integrated structure.
Sand core test piece of the present invention, the size of wherein circular sand sheet is preferred: diameter of phi 70～74mm, thickness 5～20mm.Diameter is decided according to the size of the middle corresponding component of filtration device, and thickness is used strata condition according to the drilling fluid that will detect and carried out suitably selected.
Sand core test piece of the present invention wherein is used to make preferred 25～200 order sands of sand particle diameter of suppressing the sand sheet, and correspondingly simulated formation pore throat radius is on the stratum of 0.01～500 μ m.Particularly:
Corresponding stratum pore throat radius 31.25～200.52 μ m of sand particle diameter 30～50 orders,
Corresponding stratum pore throat radius 6.25～62.50 μ m of sand particle diameter 50～90 orders,
Corresponding stratum pore throat radius 0.15～25.32 μ m of sand particle diameter 90～120 orders.
A kind of preparation method of above-mentioned sand core test piece of the present invention, step is following:
With silica sand, river sand or the extra large sand sieve branch after cleaning; Getting 25～200 purpose sands mixes by 100: 5～10 mass ratioes with phenolics or epoxy resin; And the hardening agent of adding sand quality 1～2%, be stirred into mortar, on sheeter, mortar and ring washer are pressed into one; The sheeter pressure control is at 10～20MPa, and 5～10min keep-ups pressure.The sand core test piece of pressure release, release moulding in 60～80 ℃ of held 4～10h, is processed artificial sand core test piece.
Above-mentioned phenolics or epoxy resin and hardening agent are techniques well known, can buy through market.Such as but not limited to:
Novolac systems model 2130,2127,2124,2123, the grand safe phenoplast in Huai company limited produces and sells.
Epoxy resin preferred epoxy E-44, the bright chemical industry of Guangzhou banyan company limited produces and sells.Epoxy resin also can be selected from bisphenol-A liquid epoxy resin, and main model has: E-42B, and E-39D, E-44V95, metals and chemicals company limited in Daliang City's produces and sells
The main model of hardening agent has NL, T-31, and T-593, T-594, T-650, T-651, metals and chemicals company limited in Daliang City's produces and sells.
The preparation method of the sand core test piece that another kind is above-mentioned, step is:
With the natural core section, in natural core section peripheral groove, the rubber ring washer that scribbles jointing compound is snapped in the groove, make its gluing into a single integrated structure.Perhaps,
With two measure-alike natural cores sections, corresponding one side be coated with jointing compound with metal ring packing ring man in the centre, glued into a single integrated structure.
The section of above-mentioned natural core is selected by prior art with the glued all-in-one-piece jointing compound of ring washer, and the conventional seals jointing compound of certain cohesive strength is arranged, particularly as: epoxide resin AB glue, organic silica gel etc.
The application of above-mentioned sand core test piece of the present invention is installed in sand core test piece and is used as filtration media in the filtration device, is used for measuring the filtration property of drilling fluid, and backwash operation is carried out in the test piece upset that will test simultaneously, estimates out the perviousness recovery situation of test piece.Method of application is following:
Sand core test piece is sealingly fastened in filtration device inside through ring washer; When the test property of drilling fluid; Drilling fluid is put under the micro-imaging equipment through forward and backward sand core test piece and by the sand core test piece after the back flush; Carry out the collection of test piece surface image, can be used for the analysis of the drilling fluid system microcosmic mechanism of action and the perviousness recovery situation evaluation of sand core test piece.
Concrete application process step is following:
1, with digital microscope IMAQ is carried out on the sand core test piece surface, be used to analyze its surface structure and pore diameter distribution.
2, sand core test piece is installed in the filtration device, and the drilling well fluid cylinder adds drilling fluid, begins pressurization after drilling well fluid cylinder female end lid is tightened, and is added to timing behind the required pressure, measures the filter loss of drilling fluid at the appointed time.
3, get a sand core test piece in addition and do blank assay, 2 method replaces drilling fluid to measure with clear water or base slurry set by step.The sand core test piece that permeability is high can adopt the base slurry to measure, and can adopt clear water to measure for the low sand core test piece of permeability.
4, take out sand core test piece, under digital microscope, carrying out IMAQ after its surface clean again, the image of collection is used for doing contrast with the preceding image of step 1 experiment, in order to analyze the additive for drilling fluid mechanism of action.
5, in the drilling well fluid cylinder, add clear water, and with sand core test piece by with step 2 in reverse direction place, i.e. upset is placed, pressurization is carried out back flush to sand core test piece.Sand core test piece after the taking-up back flush carries out surface or cross-section image collection, is used for microcosmic and estimates backwash effect.
6, do contrast to the blank assay of the sand core test piece repeating step 3 after the back flush, and with the result of blank assay result and step 5, estimate out its perviousness recovery situation.
The digital microscope that uses in above-mentioned each step is 10～300 multiple word microscopes.
The invention has the beneficial effects as follows:
1, cut into slices as leakage medium with sand compacting test piece or direct natural core, measure the drilling fluid filtration characteristic, more traditional leakage medium filter paper is more true to nature to the simulation of down-hole situation.
2, sand core test piece adopts washer sealing, compares to add the confined pressure sealing, and is simple in structure, easy to operate.Test piece can be reversed arbitrarily, estimates out the perviousness recovery value thereby can carry out back flush, improves the utilization factor of testing tool.
3, to the micro-imaging analysis of sand core test piece surface, can carry out Analysis on Mechanism to additive for drilling fluid, inlay treating agents such as agent, film forming agent like drilling fluid stratum protection mechanism is analyzed from microcosmic.
Description of drawings
Fig. 1 is the pressure head part-structure synoptic diagram of prior art sheeter.Among the figure, 1. plunger, 2. cylinder, 3. handle, 4. spill base.
Fig. 2 is a prior art filtration device structural representation.Among the figure, 11. drilling well fluid cylinders, 12. drilling fluids, 13. sand sheets, 14. ring washers, 15. buckles, 16. spiral shell buttons, 17. O-ring seals, 18. spill end caps, 19. tensimeters, 20. switches, 21. pressue devices.
Fig. 3 is sand core test piece structural representation (overlooking).Fig. 4 is embodiment 1 a sand core test piece structural representation (section).
Fig. 5 is embodiment 2 sand core test piece structural representations (section), and Fig. 6 is embodiment 3 sand core test piece structural representations (section), and among the figure, 13 ' is the natural core section.
Fig. 7 is the blank sand core test piece surface image of gathering with 200 multiple word microscopes in the Test Example, and sand sheet medium sand seed footpath from left to right is followed successively by 40～60 orders, 80～100 orders, 100～120 orders.
Fig. 8 is that the base of gathering with 200 multiple word microscopes in the Test Example is starched at the sand core test piece surface image, and sand sheet medium sand seed footpath from left to right is followed successively by 40～60 orders, 80～100 orders, 100～120 orders.
Fig. 9 be in the Test Example with 200 multiple word microscope collections inlay agent at the sand core test piece surface image, sand sheet medium sand seed footpath from left to right is followed successively by 40～60 orders, 80～100 orders, 100～120 orders.
Figure 10 is a sand core test piece surface image after the back flush of gathering with 200 multiple word microscopes in the Test Example, and sand sheet medium sand seed footpath from left to right is followed successively by 40～60 orders, 80～100 orders, 100～120 orders.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.What do not add detailed qualification among the embodiment all can be with reference to state of the art.
Embodiment 1: structure such as Fig. 3, shown in Figure 4.
A kind of sand core test piece is made up of sand sheet and packing ring, and said sand sheet (13) is circular, is of a size of: Φ 74mm, thickness 10mm.Said packing ring is ring washer (14), elastomeric material.Said ring washer (14) embeds 10mm in the edge of sand sheet (13), and is positioned at the centre of sand sheet (13) thickness, the sealing of O-ring seal and lower end spill end cap when being convenient on filtration device, use and on it.Said sand sheet and packing ring are when the sand sheet is made, with sheeter mortar and packing ring to be suppressed all-in-one-piece, and the preparation method is following:
With the silica sand dry screened after cleaning; Getting 40～60 orders, 80～100 orders, 100～120 purpose sands divides three groups to mix, add the hardening agent T-593 (Daliang City's metals and chemicals company limited product) of sand quality 1.5% with epoxy resin E-44 (the bright chemical industry of Guangzhou banyan company limited produces and sells) by 100: 8 mass ratioes respectively; On sheeter, mortar and ring washer (14) are pressed into one after stirring, the sheeter pressure control is at 12MPa, and 10min keep-ups pressure; The sand core test piece of moulding is released in pressure release; Under 60 ℃, put 8h, make the artificial sand core test piece of three kinds of specifications, structure is as shown in Figure 4.
Pressure head part synoptic diagram such as Fig. 1 of sheeter.
Embodiment 2: structure such as Fig. 3, shown in Figure 5.
Sand core test piece is into a single integrated structure by the section of natural core and ring washer gluing.The preparation method is following:
With natural core section, be of a size of: Φ 74mm, thickness 10mm is in the natural core peripheral groove of cutting into slices, and the rubber ring washer with scribbling jointing compound snaps in the groove, makes its gluing into a single integrated structure.
Jointing compound is selected for use: epoxide resin AB glue (a kind of two component adhesive), Foshan City Sen Meiya compound substance company limited produces, viscosity 4500Pas.
Embodiment 3: structure such as Fig. 3, shown in Figure 6.
Prepare two natural core sections, size is: Φ 74mm, thickness 5mm.Two relative one sides of natural core section are coated with jointing compound the metal ring packing ring is clipped in the middle, glued into a single integrated structure.Jointing compound is selected for use with embodiment 2.
Embodiment 4: the application of sand core test piece
As shown in Figure 2, sand sheet (13) through ring washer (14) with seal at the O of filtration device RunddichtringO (17) and spill end cap (18).Filtration device buckle (15) is locked spill end cap (18) with spiral shell button (16) with drilling well fluid cylinder (11) card jail.Drilling well fluid cylinder (11) is connected with tensimeter (19), switch (20) and pressurized equipment (21) through pressurized pipeline.In filtration property when test, be added to timing behind the required pressure through pressue device (21), measures the filter loss of drilling fluid at the appointed time.The test piece upset of testing is carried out backwash operation with clear water, estimate the perviousness recovery value of test piece.In test during property of drilling fluid, before drilling fluid handled, the test piece handled after back and the back flush is put under the micro-imaging equipment, carries out the collection of test piece surface image, can be used for the analysis of the drilling fluid system microcosmic mechanism of action.
Test Example:
Be an application experiment of sand core test piece of the present invention below, material use in test: 1, the base preparation of starching: the secondary bentonitic clay is made into the soil paste of concentration 4%, and adds 2% Na of the consumption that buries
2CO
3, more than the slaking 24h.2, inlay the preparation of shielding drilling fluid: will inlay screener and join and join the drilling fluid that is mixed with 3wt% concentration in the water.Inlaying screener is that XQ-3 inlays the drilling well pulvis, and hereinafter to be referred as inlaying agent, Shandong Dongying downhole sphering worker company limited produces and sells.3, sand core test piece is the artificial sand core test piece that three kinds of different-grain diameter 40～60 orders, 80～100 orders, 100～120 purpose silica sands are made by the method for embodiment 1.
The testing performance of drilling fluid evaluation procedure:
1, with 200 multiple word microscopes IMAQ is carried out on the sand core test piece surface of three kinds of different-grain diameters, be used to analyze its surface structure and pore diameter distribution (see figure 7).
2, sand core test piece is installed in the filtration device, and the drilling well fluid cylinder adds drilling fluid, begins pressurization after the spill end cap of drilling well fluid cylinder is tightened, and is added to timing behind the required pressure, measures the filter loss (result sees table 1) of drilling fluid at the appointed time.
3, the sand core test piece of getting one group of corresponding particle diameter is in addition done blank assay, and 2 method replaces drilling fluid to measure with clear water or base slurry set by step.The sand core test piece that permeability is high is measured with the base slurry, and the sand core test piece that permeability is low adopts clear water to measure (result sees table 1).
4, take out sand core test piece, under digital microscope, carrying out IMAQ after its surface clean again, the image of collection is used for doing contrast with the preceding image of step 1 experiment, in order to analyze the additive for drilling fluid mechanism of action (seeing Fig. 8,9).
5, in the drilling well fluid cylinder, add clear water, and with sand core test piece by with step 2 in reverse direction place, i.e. upset is placed, pressurization is carried out back flush to sand core test piece.Sand core test piece after the taking-up back flush carries out surface or cross-section image collection, is used for microcosmic and estimates the backwash effect (see figure 10).
6, do contrast to the blank assay of the sand core test piece repeating step 3 after the back flush, and with the result of blank assay result and step 5, estimate out its perviousness recovery situation (seeing table 1).
Sand core test piece leak-off and the restorability of shielding drilling fluid at different-grain diameter inlayed in investigation, and the result sees Fig. 7-10 and table 1.
Table 1 sand core test piece appraisal drilling liquid is inlayed the agent performance
Can find out from table 1, inlay agent the sand core test piece of different-grain diameter is all had sealing characteristics preferably.Comparison diagram 8 can find out that with Fig. 9 the base slurry can not form effective shutoff to the sand core test piece surface, so filter loss is bigger, and inlay in the agent logical distortion particle inlaying of test piece surface pore throat is realized effective shutoff.It is to weigh to inlay the standard to the stratum extent of injury such as agent that recoil recovers, and also is the judgement to its de-plugging performance, and the recoil back if filter loss and blank value are approaching more, explains that plugging removal effect is good more with the test of base slurry, and is more little to formation damage.After sand core test piece is carried out a back flush, inlay the test piece that agent handled and have higher restorability, reach more than 74%.Can find out from Figure 10 test piece surface structure, inlay agent the obstruction major part in sand core test piece duct is untied that inlaying agent has the residual of part on the surface, conform to experimental result.
Claims (6)
1. the sand core test piece that is used for testing performance of drilling fluid is characterized in that being made up of sand sheet and packing ring, and said sand sheet and packing ring are integrative-structures; Prepare according to the following steps:
With silica sand, river sand or the extra large sand sieve branch after cleaning; Getting 25～200 purpose sands mixes by 100: 5～10 mass ratioes with phenolics or epoxy resin; And the hardening agent of adding sand quality 1～2%, be stirred into mortar, on sheeter, mortar and ring washer are pressed into one; The sheeter pressure control is at 10～20MPa, and 5～10min keep-ups pressure; The sand core test piece of pressure release, release moulding is in 60～80 ℃ of held 4～10h.
2. sand core test piece according to claim 1 is characterized in that said sand sheet is circular, and said packing ring is a ring washer.
3. sand core test piece according to claim 2 is characterized in that circular sand sheet is of a size of diameter of phi 70～74mm, thickness 5～20mm.
4. sand core test piece according to claim 1 is characterized in that said sand sheet is a compacting sand sheet, and said packing ring embeds in the edge of sand sheet, is when the sand sheet is made, with sheeter mortar and packing ring to be suppressed all-in-one-piece.
5. according to each described sand core test piece of claim 1-4, it is characterized in that said packing ring is positioned at the centre of sand sheet thickness.
6. the application of each said sand core test piece of claim 1-5; Sand core test piece is installed in is used as filtration media in the filtration device; Be used for measuring the filtration property of drilling fluid, sand core test piece upset the carrying out backwash operation that will test simultaneously, the perviousness recovery situation of evaluation sand core test piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102027227A CN101881708B (en) | 2010-06-18 | 2010-06-18 | Sand core test piece used for testing performance of drilling fluid and preparation and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102027227A CN101881708B (en) | 2010-06-18 | 2010-06-18 | Sand core test piece used for testing performance of drilling fluid and preparation and application thereof |
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| CN101881708A CN101881708A (en) | 2010-11-10 |
| CN101881708B true CN101881708B (en) | 2012-05-30 |
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| CN2010102027227A Expired - Fee Related CN101881708B (en) | 2010-06-18 | 2010-06-18 | Sand core test piece used for testing performance of drilling fluid and preparation and application thereof |
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| CN105064989A (en) * | 2015-08-12 | 2015-11-18 | 郑力会 | Method for observing stratum blocking form of working fluid in well |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2161260Y (en) * | 1992-10-10 | 1994-04-13 | 华南理工大学 | Disposable electrocardioelectrode and its producing apparatus |
| EP0697232A1 (en) * | 1994-07-19 | 1996-02-21 | Pall Corporation | In-line filter for tubing |
| CN2242977Y (en) * | 1995-04-03 | 1996-12-18 | 徐有信 | Multi-parameter wheel-drilling liquid performance sensor |
| CN201778804U (en) * | 2010-06-18 | 2011-03-30 | 中国石油大学(华东) | Core test block used for testing properties of drilling liquid |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008016933A2 (en) * | 2006-07-31 | 2008-02-07 | Gregory Majersky | Concrete filtering systems and methods |
-
2010
- 2010-06-18 CN CN2010102027227A patent/CN101881708B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2161260Y (en) * | 1992-10-10 | 1994-04-13 | 华南理工大学 | Disposable electrocardioelectrode and its producing apparatus |
| EP0697232A1 (en) * | 1994-07-19 | 1996-02-21 | Pall Corporation | In-line filter for tubing |
| CN2242977Y (en) * | 1995-04-03 | 1996-12-18 | 徐有信 | Multi-parameter wheel-drilling liquid performance sensor |
| CN201778804U (en) * | 2010-06-18 | 2011-03-30 | 中国石油大学(华东) | Core test block used for testing properties of drilling liquid |
Non-Patent Citations (1)
| Title |
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| 赵雄虎 等.砂床法评价钻井液滤失性可行性研究.《西部探矿工程》.2009,(第5期),83-85. * |
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