CN102707016B - Evaluation method and device for coating-restraining performance of drilling fluid system - Google Patents
Evaluation method and device for coating-restraining performance of drilling fluid system Download PDFInfo
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- CN102707016B CN102707016B CN201210179438.1A CN201210179438A CN102707016B CN 102707016 B CN102707016 B CN 102707016B CN 201210179438 A CN201210179438 A CN 201210179438A CN 102707016 B CN102707016 B CN 102707016B
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Abstract
The invention provides an evaluation method for a coating-restraining performance of a drilling fluid system. The evaluation method comprises the following steps: dynamically soaking a rock debris block into a to-be-evaluated drilling fluid system and lasting for a preset period of time; taking out the rock debris block and cleaning away the drilling fluid attached to the surface; placing the rock debris block into a hardness test jar; applying a pressure, thereby extruding the rock debris block out of the hardness test jar, wherein the hardness test jar has a preset ultimate pressure value; and collecting change values of the applied pressure in real time and drawing a pressure change curve, wherein if the time for the value of the applied pressure reaching the ultimate pressure value is shorter, the hardness of the soaked rock debris block is higher and the coating-restraining performance of the drilling fluid system is stronger. The invention also provides an evaluation device applied to the evaluation method.
Description
Technical field
The present invention relates to oil drilling field, particularly a kind of drilling fluid system suppresses coated method of evaluating performance and equipment.
Background technology
Do not disperse drilling fluid system to be used widely in modern drilling construction because thering is the coated performance of excellent inhibition.How the coated performance of the inhibition of appraisal drilling liquid system or treating agent seems particularly important.
Comparatively general drilling fluid system encapsulating ability energy evaluation method has linear plavini and rolling recovery method at present.The repression of swelling effect of linear expansion method energy effective evaluation drilling fluid system to landwaste, but can not characterize the inhibition peptizaiton of drilling fluid system.Rolling recovery method can effective evaluation drilling fluid system inhibition dispersive property, but can not characterize the repression of swelling effect of drilling fluid system.And two kinds of methods do not relate to the evaluation to landwaste bulk strength after drilling fluid system dynamic soaking.
Evaluation method for landwaste bulk strength has needle penetration method and sillar bearing resistance method conventionally.Needle penetration method was to measure the ability of the soft or hard degree of pitch and railway grease, denseness, opposing shear failure originally, was not suitable for the measurement for landwaste bulk strength.Sillar bearing resistance method characterizes cohesion and the internal friction of rock, these class methods all need regular sillar shape and static mud soak and metering system, can not simulate temperature, pressure condition and the motion state of landwaste piece drilling fluid system in wellbore construction process.
Therefore, above-mentioned drilling fluid system encapsulating ability energy evaluation method all has limitation, can not be advantageously applied in the practical operation of wellbore construction.
Summary of the invention
The first object of the present invention is to provide a kind of drilling fluid system and suppresses coated method of evaluating performance, and the method is assessed the coated performance of inhibition of drilling fluid system by measuring landwaste piece in the drilling fluid system firmness change after simulation drilling fluid temperature pressure condition dynamic soaking.
Drilling fluid system of the present invention suppresses coated method of evaluating performance and comprises the following steps:
Landwaste piece dynamic soaking is also continued to the schedule time in drilling fluid system to be evaluated, then take out landwaste piece and clean the drilling fluid that goes surface attachment;
Landwaste piece is placed in to hardness test tank, and by exerting pressure, forces landwaste piece to be extruded hardness test tank, described hardness test tank has a default extreme pressure value;
Real-time Collection applied pressure changing value, and draw pressure history;
Reach capacity time of force value of institute's applied pressure value is shorter, illustrates that the hardness of the landwaste piece after soaking is larger, and the coated ability of inhibition of drilling fluid system is stronger.
Preferably, the coated method of evaluating performance of described drilling fluid system inhibition also comprises:
Real-time Collection is extruded the mass value of the landwaste piece of hardness test tank, and rendering quality change curve;
When applied pressure value reaches capacity force value, the mass value of landwaste piece of extruding hardness test tank is lower, illustrates that the hardness of the landwaste piece after soaking is larger, and the coated ability of inhibition of drilling fluid system is stronger.
In conjunction with the two the variation of force value and mass value, can the coated ability of the inhibition of the intensity of landwaste piece and drilling fluid system be made more accurately and being evaluated.
Preferably, landwaste piece of the present invention is 3/8 inch～3/4 inch landwaste piece, preferably uses standard drilling cuttings Hole plug (natural sodium bentonite grain), but also can obtain corresponding landwaste piece according to the specific lithology of different oil field blocks, layer position.
Described " dynamic soaking " refers to, the drilling fluid that is added with landwaste piece is put in metal or glass jar to (according to experimental temperature, select which kind of tank body), use roller heating stove to test.Roller heating stove is that drilling fluid is evaluated common apparatus, and temperature, pressure, the annular space under can simulation well such as circulates at the state, for studying the performance of drilling fluid under heating rolling condition.Generally, drilling fluid together with landwaste piece with metal or glass jar axial rotation, in laminar condition (with respect to turbulent flow for).
Described " extreme pressure value " refers to, the ultimate value for fear of an equipment safety impaired and that in the process of extruding landwaste piece, institute's applied pressure is preset, reaches this value, and equipment quit work, and no longer continues to increase pressure.The span of extreme pressure value generally can be between 5Mpa～20Mpa, and concrete value can be set according to the actual conditions of equipment and drilling fluid to be measured.
Preferably, landwaste piece be under certain temperature, pressure condition dynamic soaking in drilling fluid system to be evaluated.Temperature is accurate highest stabilizing temperature or the formation temperature on drilling fluid stratum used or the circulating temperature on drilling fluid stratum used (determining according to concrete system application conditions) of system; Pressure is generally normal pressure, and the pressure after heating in tank body is the saturated vapor pressure (also can carry out under 100psi inert gas conditions) of respective liquid.
Preferably, landwaste piece soaks approximately 1～16 hour in drilling fluid system, can determine the concrete time according to different drilling cuttings conditions.
Preferably, adopt the drilling fluid of the aqueous cleaning landwaste piece surface attachment of salt solution or isopropyl alcohol.Wherein, salt solution can be used saturated brine; In the aqueous solution of isopropyl alcohol, the concentration of isopropyl alcohol can be 40%～60%.
Drilling fluid system of the present invention suppresses, in coated method of evaluating performance, preferably, can to landwaste piece, apply axle pressure by constant-flux pump, mechanical torque or inert gas air pressure.Most preferably, adopt constant-flux pump to apply axle pressure, constant-flux pump can provide constant current speed and two kinds of mode of operations of constant voltage, increases in the line digital display manometer, thereby can pass through computer software Real-time Collection pressure data simultaneously.
Because the hardness of landwaste piece of soaking in drilling fluid system is relevant with the coated performance of the inhibition of system.Degree of hydration according to the landwaste piece due to the coated ability difference of drilling fluid system inhibition is different, thereby causes the hardness of landwaste piece different, can evaluate the coated performance of the inhibition of drilling fluid system.Method of the present invention not only can be evaluated the coated performance of the inhibition of drilling fluid system, has also reacted the hardness level of landwaste piece under the drilling well Dynamic Construction condition of simulation simultaneously.In addition, method of the present invention also has the feature of strong operability, is highly suitable for the practice of wellbore construction.
Another object of the present invention is to provide a kind of valuator device that suppresses the evaluation method of coated performance for above-mentioned drilling fluid system.
Described valuator device comprises support 1, hardness test tank 2, cover 3, base ring 4, chassis 5, take-up reel 8, snap ring 9 and meausring apparatus 10, wherein:
Hardness test tank 2 is fixed on the support 1 of vertical placement by snap ring 9, the top of hardness test tank 2 has been threaded connection cover 3, have the chassis 5 in a plurality of holes to be positioned at the bottom of hardness test tank 2, the bottom periphery of hardness test tank 2 has been threaded connection base ring 4; In hardness test tank 2, include space in tank is isolated into upper and lower two-part batching plug 21, batching plug 21 can move up and down in hardness test tank 2; Hardness test tank 2 is suspended in take-up reel 8 tops, and take-up reel 8 is placed on meausring apparatus 10.
Further, on cover 3, be provided with pressure interface 31; The pressure interface 31 connecting fluid pressure pipes of cover 3 converge 6.On hydraulic pressure manifold 6, be provided with pressure control valve 7 and tensimeter 61, so that the change value of pressure of Real-time Collection pressure space.
Further, chassis 5 is provided with a plurality of holes of different pore size, and described aperture is 1mm～5mm; The lower surface on chassis 5 is also provided with rotatable scraper 30.
It is exquisite, workable that drilling fluid system of the present invention suppresses coated performance evaluation device structure, can be advantageously applied to above-mentioned drilling fluid system and suppress in coated method of evaluating performance.
Accompanying drawing explanation
Fig. 1 is the organigram that the drilling fluid system of the embodiment of the present invention suppresses coated performance evaluation equipment.
Fig. 2 is that the drilling fluid system of the embodiment of the present invention suppresses in coated method of evaluating performance, pressure and landwaste piece mass change curve map.
Embodiment
Below the present invention is described in further detail so that those skilled in the art can put into practice the present invention.Should be appreciated that and can adopt other embodiments, and can make suitable change and not depart from the spirit or scope of the present invention.For fear of for making those skilled in the art can put into practice unnecessary details the present invention, instructions may omit some known to those skilled in the art information.Therefore, below describe in detail and should not understand with restrictive meaning, and scope of the present invention is only defined by claims.
Refer to Fig. 1, it is that drilling fluid system of the present invention suppresses coated performance evaluation equipment.As shown in Figure 1, the drilling fluid system of the embodiment of the present invention suppresses coated performance evaluation equipment and mainly comprises support 1, hardness test tank 2, cover 3, base ring 4, chassis 5, take-up reel 8, snap ring 9 and meausring apparatus 10 etc.
Hardness test tank 2 is fixed on by snap ring 9 on the support 1 of vertical placement, and two snap rings 9 are embraced hardness test tank 2 from outside surface annular one on the other.
The top of hardness test tank 2 has been threaded connection cover 3.Chassis 5 is positioned at the bottom of hardness test tank 2, is provided with a plurality of holes of different pore size (1mm～5mm) on it.The bottom periphery of hardness test tank 2, has been threaded connection base ring 4.
In hardness test tank 2, include space in tank is isolated into upper and lower two-part batching plug 21, this batching plug 21 can, under the pressure of gas or liquid, move up and down in hardness test tank 2.In hardness test tank 2, the space of batching plug 21 tops is pressure space 22, and the space of batching plug 21 belows is drilling cuttings lab space 23.
In the present embodiment, batching plug 21 adopts hydraulic pressure to move.On cover 3, be provided with pressure interface 31, can connect external pressure supply arrangement such as hydraulically operated equipment (HOE) etc.In the present embodiment, the pressure interface 31 on cover 3 connects hydraulically operated equipment (HOE) by hydraulic pressure manifold 6.On hydraulic pressure manifold 6, be provided with pressure control valve 7.On hydraulic pressure manifold 6, tensimeter 61 can also be set, so that the pressure in Real Time Observation pressure space 22.
Hardness test tank 2 is suspended in take-up reel 8 tops, and take-up reel 8 is placed on meausring apparatus 10, the quality of the drilling cuttings that Real-time Collection take-up reel 8 receives.
The lower surface on chassis 5 also can arrange scraper 30, by revolving scraper 30, can easily the landwaste of extruding hardness test tank 2 be scraped in take-up reel 8.
In the present embodiment, hydraulically operated equipment (HOE) is constant-flux pump, and it is further connected with terminal, thereby can and draw out pressure history figure in pressure space 22 and the mass change figure of the drilling cuttings that take-up reel 8 receives by computer software Real-time Collection.
When the coated performance of the inhibition of drilling fluid system is evaluated, first landwaste piece (standard drilling cuttings Hole plug) dynamic soaking under 50 ℃ of temperature, 100psi pressure is also continued to 2 hours in drilling fluid system to be evaluated, then take out landwaste piece and with saturated brine, clean the drilling fluid that goes landwaste piece surface attachment.
Subsequently the landwaste piece after soaking is placed in to the drilling cuttings lab space 23 of the hardness test tank 2 of valuator device shown in Fig. 1, by constant-flux pump, applying axle pressure moves downward batching plug 21, and force landwaste piece under pressured state, to be extruded hardness test tank 2, that is, by the hole arranging on chassis 5, drop on receiving plate 8.
The mass value of the drilling cuttings receiving by the force value in tensimeter 61 and meausring apparatus 10 Real-time Collection pressure spaces 22 and take-up reel 8.Then by computer software, draw pressure history and mass change curve.
According to the method described above, under equal conditions, draw corresponding pressure history and the mass change curve of one group of drilling fluid system to be evaluated.Then by comparative analysis, the inhibition that can organize drilling fluid system to be evaluated to this is coated with the hardness of the landwaste piece after performance and immersion and makes an appraisal.It is shorter that institute's applied pressure value reaches time of extreme pressure value of equipment, illustrates that the hardness of the landwaste piece after soaking is larger, and the coated ability of inhibition of drilling fluid system is stronger.Meanwhile, when institute's applied pressure value reaches the extreme pressure value of equipment, the mass value of landwaste piece of extruding hardness test tank is lower, illustrates that the hardness of the landwaste piece after soaking is larger, and the coated ability of inhibition of drilling fluid system is stronger.
Application example:
Preparation drilling fluid 1#, 2#, 3#, aged at room temperature 24 hours.Respectively 25g standard landwaste piece is immersed in 350mL drilling fluid, be put in ageing can, under 50 ℃ of temperature, 100psi pressure, continue dynamic soaking 2 hours, then take out landwaste piece and with saturated brine, clean the drilling fluid that goes landwaste piece surface attachment.
Subsequently the landwaste piece after soaking is placed in to the drilling cuttings lab space 23 of the hardness test tank 2 of valuator device shown in Fig. 1, by constant-flux pump, applying axle pressure moves downward batching plug 21, and force landwaste piece under pressured state, to be extruded hardness test tank 2, that is, by the hole arranging on chassis 5, drop on receiving plate 8.
Equipment gathers pressure (P) and the quality (M) in experimentation automatically, and result is as shown in table 1 below.
Table 1
According to the data in table 1, draw this pressure of organizing drilling fluid system to be evaluated and mass change curve map.As shown in Figure 2.
From table 1 data and Fig. 2, can find out: the coated performance of inhibition of 1# drilling fluid system is the poorest, landwaste hardness after immersion is minimum, the time of its force value that reaches capacity (5mPa) is the longest, for 36min, the landwaste quality extruding constantly rises, quality is maximum, and the landwaste quality extruding while reaching capacity force value reaches 19.9g.The coated better performances of inhibition of 2# drilling fluid system, the time of the force value that reaches capacity (5mPa) is 30min, the landwaste quality extruding while reaching capacity force value is 14.8g.It is relatively best that 3# drilling fluid system suppresses coated performance, and the hardness of the landwaste after immersion is maximum, and aquation part is minimum, and the time of the force value that reaches capacity (5mPa) is only 20min, and the landwaste quality extruding while reaching capacity force value is only 8.2g.
In sum; these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, therefore; all any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.
Claims (6)
1. drilling fluid system suppresses a coated method of evaluating performance, comprises the following steps:
Under temperature and pressure condition, landwaste piece is soaked in drilling fluid system to be evaluated and makes drilling fluid in laminar condition, also continue the schedule time together with landwaste piece, then take out landwaste piece and clean the drilling fluid that goes surface attachment;
The hardness test tank with a default extreme pressure value is provided, and the top of hardness test tank has been threaded connection cover, has the chassis in a plurality of holes to be positioned at the bottom of hardness test tank, and the bottom periphery of hardness test tank has been threaded connection base ring; In hardness test tank, include space in tank is isolated into upper and lower two-part batching plug, the space of batching plug top is pressure space, and the space of batching plug below is drilling cuttings lab space, and hardness test tank is suspended in take-up reel top,
Landwaste piece is placed in to the drilling cuttings lab space in hardness test tank, and by exerting pressure, forces landwaste piece to drop and on receiving plate, be extruded described hardness test tank by the hole arranging on chassis;
The value of Real-time Collection applied pressure, and draw pressure history;
It is shorter that the value of institute's applied pressure reaches the time of described extreme pressure value, illustrates that the hardness of the landwaste piece after soaking is larger, and the coated ability of the inhibition of drilling fluid system is stronger.
2. the method for claim 1, also comprises:
Real-time Collection is extruded the value of quality of the landwaste piece of described hardness test tank, and rendering quality change curve;
When the value of applied pressure reaches described extreme pressure value, the value of quality of landwaste piece of extruding hardness test tank is lower, illustrates that the hardness of the landwaste piece after soaking is larger, and the coated ability of the inhibition of drilling fluid system is stronger.
3. the method for claim 1, the bottom hole circulating temperature on the highest stabilizing temperature that wherein said temperature is system or the formation temperature on drilling fluid stratum used or drilling fluid stratum used; Described pressure is normal pressure or 100psi.
4. the method for claim 1, the wherein said schedule time is 1～16 hour.
5. the method for claim 1, the drilling fluid of wherein said landwaste piece surface attachment adopts the aqueous cleaning of salt solution or isopropyl alcohol; Described salt solution is saturated brine, and in described isopropanol water solution, the concentration of isopropyl alcohol is 40%～60%.
6. the method for claim 1, wherein exerts pressure to landwaste piece by constant-flux pump.
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| CN201210179438.1A CN102707016B (en) | 2012-06-01 | 2012-06-01 | Evaluation method and device for coating-restraining performance of drilling fluid system |
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| CN102707016B true CN102707016B (en) | 2014-10-22 |
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| CN104407099B (en) * | 2014-10-16 | 2016-06-08 | 中国海洋石油总公司 | Sand cleaning fluid performance test methods |
| CN109115628A (en) * | 2018-07-27 | 2019-01-01 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | A kind of method for estimating stability of drilling fluid to rock stratum |
| CN110595900B (en) * | 2019-09-29 | 2021-10-01 | 太原理工大学 | Method for testing deformation and damage of coal pillar under condition of longitudinal non-uniform distribution of moisture |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: China Oilfield Services Limited Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: China Oilfield Services Limited Patentee before: China National Offshore Oil Corporation |