CN101892831B - Method for measuring displacement efficiency of cement slurry by using temperature sensing device - Google Patents
Method for measuring displacement efficiency of cement slurry by using temperature sensing device Download PDFInfo
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- CN101892831B CN101892831B CN2010102007774A CN201010200777A CN101892831B CN 101892831 B CN101892831 B CN 101892831B CN 2010102007774 A CN2010102007774 A CN 2010102007774A CN 201010200777 A CN201010200777 A CN 201010200777A CN 101892831 B CN101892831 B CN 101892831B
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Abstract
The invention relates to a method for measuring displacement efficiency by using a temperature sensing device in a simulation experiment on the displacement efficiency of cement slurry in the field of petroleum engineering. The method sequentially comprises the following steps of: (1) forming 4 holes on the surface of a shaft at a measuring section in four directions for arranging temperature sensors respectively; (2) preparing mud and cement slurry with water of different temperatures; (3) adjusting eccentricity of an inner tube of the shaft in an outer tube of the shaft; (4) circulating with the mud to fill the annular space between a bushing and the shaft with the mud; (5) performing displacement with the cement slurry; (6) transmitting data to a computer by a data acquisition card and drawing four T-S curves by the computer according to temperature variation of each temperature sensor; and (7) analyzing the displacement efficiencies of the cement slurry at different positions by comparing the different T-S curves. By displacing the temperature of the mud with that of the cement slurry in a most intuitive way, the displacement efficiency of the cement slurry can be analyzed on the computer and time and labor are saved.
Description
Affiliated technical field
The present invention relates to utilize in a kind of displacement efficiency of cement slurry simulated experiment in the petroleum works field temperature sensing device to measure the method for displacement efficiency.
Background technology
At present; All adopt more traditional laser velocimeter to coagulate measuring method at home and abroad in the displacement efficiency of cement slurry simulated experiment of petroleum works with waiting; And obviously there is deficiency in method in common at present: laser velocimetry can be measured the displacement efficiency of cement paste; But can only use the similar liquid of cement paste and mud like this, the situation that replaces mud for the cement paste under the true environment is to be difficult to realize; Wait to coagulate to adopt after mensuration need wait cement paste to replace and cut whole pit shaft open; Coagulate the replacement effect that distribution situation analyzes intuitively cement paste according to the time of cement paste then; Though such result is directly perceived effectively and what use is that real mud and cement paste make an experiment; But complicated operation is not suitable for doing for a long time in the laboratory a large amount of experiments.And present experimental technique all can not draw the analysis data in real time, and can not carry out on-site real-time according to real time data and observe.
Therefore, research and develop a kind of novel displacement efficiency of cement slurry analogue experiment method, become the task of top priority.
Summary of the invention
The object of the present invention is to provide a kind of method of utilizing temperature sensing device to measure displacement efficiency of cement slurry; This method is through the temperature contrast of the mud of cement paste replacement the most intuitively; Promptly in displacement process, pass through the fluidised form and the velocity variations of displacement fluid, analyze the displacement efficiency of cement paste with this.
For reaching above technical purpose, the present invention provides following technical scheme.
When off-centre, the sleeve pipe eccentricity increases, and the flow velocity at different gap place and fluidised form will take place to change greatly in the eccentric annulus, and the current difference in width gap can reach tens times.Liquid in the broad gap scope has reached turbulent flow, and other gap, Laminar Flow but might be made in particularly narrow gap.The inhomogeneities of liquid flow is brought following problem to cementing job, when cement paste replaces drilling fluid; The broad gap drilling fluid possibly squeezed away by replacement, and the drilling fluid in narrow gap still is trapped in the origin-location, causes drilling fluid to scurry groove; Influence cementing quality, but the inhomogeneities of flow, flow velocity and fluidised form is returned high the existence than big-difference with replacement relation that makes different gap place liquid and cement paste; Be that the replacement effect of cement paste is better in the broad gap scope, and reach design attitude in advance, and the replacement effect of cement paste is relatively poor in the narrow interstice coverage; And be in lower position, make the airtight quality variation in full annular space.
The present invention is utilized under the temperature different situations of the temperature of cement paste in the cement paste displacement process and mud, and obtains the displacement efficiency of cement paste.Promptly in the pit shaft of measuring section; Open 4 holes at the four direction of well bore face; Be every at a distance from 90 ° of perforates on the same cross section, lay temperature pick up, this temperature pick up is a temperature sensors of high precision; Its resolution ratio is up to 0.001 ℃, and this temperature pick up also can be measured in weakly alkaline liquid easily.Make the contact of sensor be deep into the pit shaft measuring section, but can not stretch out oversizely, can make temperature sensors of high precision have influence on the fluidised form of liquid like this, result of experiment is caused certain influence.The eccentric degree of pipe in the pit shaft outer tube reaches experimental requirements in the adjustment pit shaft, uses the water of different temperatures to prepare to mud and cement paste, makes mud and cement paste form certain temperature difference.Utilize mud to circulate, make the annular space between sleeve pipe and the pit shaft be full of mud, use cement paste to replace; When cement paste replaces the TEMP measuring section; The temperature that arrives first cement paste can be caught by temperature pick up, thereby forms certain temperature fluctuation, and data collecting card can be sent to computer to data; In computer, be depicted as temperature-time curve figure (T-S curve map); Obtain along with the temperature on the change of time cross section, As time goes on, computer can be depicted as four T-S curves according to the variations in temperature of each temperature pick up.
Analytical method 1: longitudinal comparison, four curve temperature T at the same time change to such an extent that the problem that speed reflected is the speed of displacement velocity, and V ∝ T, and it is such that what reflect is exactly the speed that cement paste replaces drilling fluid speed.And in pit shaft because eccentric reason forms broad gap and narrow gap in annular space.The replacement effect here is with narrow gap drilling fluid flow velocity Vnm, and temperature representes that with Tnm broad gap cement paste flow velocity Vwc and temperature are represented with Twc; Vnm/Vwc is more near 1, because V ∝ is T, so Tnm/Twc is more near 1; Replace effect better, after the moving shearing stress of cement paste was equal to or greater than threshold, cement paste made the drilling fluid in narrow gap begin to flow for the shear stress of stream; Vnm/Vwc=1, Tnm/Twc=1, displacement efficiency is better.As continue to increase flow and barometric gradient, this moment, the increase of broad gap cement paste flow velocity was faster than narrow gap drilling fluid flow velocity, Vnm/Vwc＞1, Tnm/Twc＞1, displacement efficiency variation.Like the moving shearing stress subcritical value of cement paste, the cement paste undercurrent can not make drilling fluid flow.
Analytical method 2: lateral comparison; Temperature development trend in a period of time on each bar T-S curve can obtain; Before not replacing, the T-S curve is smoother steady temperature, along with the beginning of displacement efficiency; The T-S curve begins to change; The displacement process of cement paste is accomplished when the T-S curve reaches level and smooth steady temperature once more, and the time of noting variations in temperature in the level and smooth steady temperature curve is the replacement time, and the factor that mainly influences the replacement time is the fluidised form of eccentric and cement paste in the pit shaft.Under the certain situation of turbulence level, displacement efficiency increases with the prolongation of time of contact, but after increasing certain value time of contact, displacement efficiency tends towards stability, and no longer the prolongation with time of contact increases.Contrast four different T-S curves and can analyze the displacement efficiency that replaces mud at the cement paste of diverse location.
A kind of method of utilizing temperature sensing device to measure displacement efficiency of cement slurry may further comprise the steps successively:
1 opens 4 holes at the four direction of measuring section well bore face, lays temperature pick up respectively;
The 2 pairs of mud and cement paste use the water of different temperatures to prepare;
The eccentric degree of pipe in the pit shaft outer tube in the 3 adjustment pit shafts;
4 utilize mud to circulate, and make the annular space between sleeve pipe and the pit shaft be full of mud;
5 use cement paste to replace, and when cement paste replaced the TEMP measuring section, the temperature that arrives first cement paste was caught by temperature pick up, formed certain temperature fluctuation;
6 data collecting cards are sent to computer to data, and computer is depicted as four T-S curves according to the variations in temperature of each temperature pick up;
The different T-S tracing analysis of 7 contrasts replaces the displacement efficiency of mud at the cement paste of diverse location.
Compared with prior art; Beneficial effect of the present invention is: through the temperature of the mud of cement paste replacement the most intuitively; Just can analyze the displacement efficiency of cement paste on computers; Both saved time, and saved the man power and material again, and this experimental technique is the displacement efficiency that analyzes cement paste from the situation of quantitative change the most intuitively.
Description of drawings
Fig. 1 reaches 30% when eccentricity, drilling fluid to join the slurry temperature be 50 ℃, cement paste to join the slurry temperature be 70 ℃, replace experiment and the T-S curve map that obtains.
The specific embodiment
Further illustrate this method below in conjunction with accompanying drawing.
A kind of method of utilizing temperature sensing device to measure displacement efficiency of cement slurry may further comprise the steps: the four direction on surface is laid temperature pick up respectively in the measuring section pit shaft; Prepare mud and cement paste respectively, it is 50 ℃ that mud is joined the slurry temperature, and it is 70 ℃ that cement paste is joined the slurry temperature; The eccentric degree of pipe in the pit shaft outer tube reaches 30% in the adjustment pit shaft; Utilize mud to circulate, make in the annular space between sleeve pipe and the pit shaft to be full of mud; Use cement paste to replace; Data collecting card is sent to computer to data, and computer is depicted as four T-S curves according to the variations in temperature of each temperature pick up.
Referring to Fig. 1.Can find out according to the T-S curve, the overall replacement time is 10 '.
Contrast different T-S tracing analysis replaces mud at the cement paste of diverse location displacement efficiency:
Before the experiment beginning, the temperature of drilling fluid is 50 ℃, and this temperature captured by temperature pick up, and is sent to computer;
After the experiment beginning, still be 50 ℃, and the temperature that is sent to computer does not change still in the temperature of 2 ' before drilling fluids;
When arriving for 2 ' time, the T-S curve begins to change, and the temperature pick up that is positioned at narrow gap obtains temperature to begin to raise, and the temperature curve of other positions do not change, and explain that cement paste has at this moment replaced the position in narrow gap;
2 ' 30 " in the temperature curve in gap, the left side begin to change; explain that this moment, cement paste replaced the position in gap, the measuring section left side; and the temperature curve of two other do not change, explains that cement paste has at this moment replaced the position in gap, the left side;
3 ' in the temperature curve in gap, the right begin to change; Explain that this moment, cement paste replaced the position in gap, measuring section the right; And other one temperature curve does not change, and the position in gap on the right of cement paste has replaced at this moment is described;
3 ' 30 " in the temperature curve of broad gap begin to change, explain that cement paste has at this moment replaced the position of measuring section broad gap;
4 ' in, narrow gap drilling fluid temperature Tnm is 51 ℃, broad gap cement paste temperature T wc is 58 ℃, so Tnm/Twc=0.87 explains that displacement efficiency is relatively good incipient the time;
5 ' in, narrow gap drilling fluid temperature Tnm is 63 ℃, broad gap cement paste temperature T wc is 53 ℃, so Tnm/Twc=0.84 explains that in the process that replaces, the displacement efficiency of cement paste descends gradually;
6 ' in, narrow gap drilling fluid temperature Tnm is 65 ℃, broad gap cement paste temperature T wc is 56 ℃, so Tnm/Twc=0.86 explains the carrying out along with displacement process, the displacement efficiency of cement paste rises gradually;
7 ' in, narrow gap drilling fluid temperature Tnm is 67 ℃, broad gap cement paste temperature T wc is 59 ℃, so Tnm/Twc=0.88 explains the carrying out along with displacement process, the displacement efficiency of cement paste rises gradually;
8 ' in, narrow gap drilling fluid temperature Tnm is 69 ℃, broad gap cement paste temperature T wc is 62 ℃, so Tnm/Twc=0.89 explains the carrying out along with displacement process, the displacement efficiency of cement paste rises gradually;
9 ' in, narrow gap drilling fluid temperature Tnm is 70 ℃, broad gap cement paste temperature T wc is 66 ℃, so Tnm/Twc=0.94 explains the carrying out along with displacement process, the displacement efficiency of cement paste rises gradually;
10 ' in, narrow gap drilling fluid temperature Tnm is 70 ℃, broad gap cement paste temperature T wc is 70 ℃, so Tnm/Twc=1 explains the carrying out along with displacement process, cement paste fully displacement drilling fluid.
In this example, replace time of contact and be 10 ', according to the experience that replaces time of contact, when turbulence replacement time of contact greater than 10 ' time, it is higher that cement paste replaces success rate.
Claims (1)
1. method of utilizing temperature sensing device to measure displacement efficiency of cement slurry may further comprise the steps successively:
(1) opens 4 holes at the four direction of measuring section well bore face, lay temperature pick up respectively;
(2) use the water of different temperatures to prepare to mud and cement paste;
(3) eccentric degree of pipe in the pit shaft outer tube in the adjustment pit shaft;
(4) utilize mud to circulate, make the annular space between sleeve pipe and the pit shaft be full of mud;
(5) use cement paste to replace, when cement paste replaced the temperature sensor measurement section, the temperature that arrives first cement paste was caught by temperature pick up, formed certain temperature fluctuation;
(6) data collecting card is sent to computer to data, and computer is depicted as four temperature-time curves according to the variations in temperature of each temperature pick up;
(7) contrast different temperature-time graph analysis replaces the displacement efficiency of mud at the cement paste of diverse location.
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| CN2010102007774A CN101892831B (en) | 2010-06-13 | 2010-06-13 | Method for measuring displacement efficiency of cement slurry by using temperature sensing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106481334A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | Method for evaluating the stability replacing interface |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103174397A (en) * | 2011-12-22 | 2013-06-26 | 中国石油化工股份有限公司 | Test device and test method of simulating well concentration cement slurry displacement efficiency |
| CN103556986B (en) * | 2013-11-11 | 2016-04-06 | 中国石油化工股份有限公司 | Simulation cementing displacement efficiency measuring method |
| CN104500045B (en) * | 2014-12-15 | 2018-03-27 | 中铁第四勘察设计院集团有限公司 | A kind of geothermal test method of deep cavern internal drilling slip casting |
| CN105257242B (en) * | 2015-11-20 | 2017-07-25 | 东北石油大学 | Eccentric annulus cementing additional amount determines method |
| CN110617018B (en) * | 2019-09-16 | 2021-06-11 | 西南石油大学 | Device and method for evaluating flushing efficiency of filter cake of well cementation cement injection drilling fluid |
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