CN109944582A - Method for analyzing position of stratum containing fractures in shaft - Google Patents
Method for analyzing position of stratum containing fractures in shaft Download PDFInfo
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- CN109944582A CN109944582A CN201811637465.2A CN201811637465A CN109944582A CN 109944582 A CN109944582 A CN 109944582A CN 201811637465 A CN201811637465 A CN 201811637465A CN 109944582 A CN109944582 A CN 109944582A
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- pit shaft
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Abstract
The invention provides a method for analyzing a position of a stratum containing fractures in a shaft, which comprises the steps of placing a pressure sensor at a specific position in the shaft, acquiring a hydraulic value at the position by using the sensor, rapidly and accurately analyzing a change curve of hydraulic pressure along with time, a change curve of hydraulic pressure change rate along with time and a change curve of a dynamic liquid level along with time in the shaft to obtain a leakage or water burst position of the shaft containing the fractures, calculating corresponding leakage or water burst amount according to the size of the shaft, only arranging the pressure sensor at the bottom of the shaft, and acquiring hydraulic data to indirectly obtain the position of a leakage layer or a water burst layer and the corresponding amount.
Description
Technical field
The present invention relates to the analysis methods that a kind of pit shaft includes creviced formation position.
Background technique
At present in the exploration and development of country's petroleum resources, being frequently run onto brill and meeting causes often to miss in well containing creviced formation
Or water burst situation, and the case where top water-bearing layer channelling to coal seam can be encountered in the shallower coal bed gas extraction of buried depth.
Aiming at the problem that being encountered in above-mentioned engineering, it is quite necessary to propose a kind of fast and accurately acquisition lost-circulation zone or water burst
The position of layer, the analysis method for calculating corresponding wastage or water yield that can be quantified, are in Oil And Gas Exploration And Development
Quickly propose that solving leakage or water burst countermeasure provides strong technical support containing creviced formation.
Summary of the invention
In order to solve the above technical problems, the present invention provides the analysis method that a kind of pit shaft includes creviced formation position, it should
Method acquires the hydraulic pressure value at the position using sensor by specific position placement force sensor in the wellbore, by dividing
Analyse hydraulic versus time curve, hydraulic change rate versus time curve, change with time song in hydrodynamic face in pit shaft
Line quick and precisely analyzes the position of the leakage of pit shaft containing creviced formation or water burst, and is calculated according to the size of pit shaft and missed everywhere
Amount or water yield.
The present invention is achieved by the following technical programs.
A kind of pit shaft provided by the invention includes the analysis method of creviced formation position, and steps are as follows:
S1, pressure sensor, the decentralization vertical depth H of calibrating (base measuring) pressure sensor are transferred in pit shaft；
S2, the hydraulic data changed over time in production wells bottom；
S3, it collects downhole well fluid and measures its density；
S4, analysis pit shaft pressure sensor data are calculated；
S5, the position for determining each lost-circulation zone or water burst layer in pit shaft；
S6, each lost-circulation zone or the corresponding wastage of water burst layer or water yield Q in pit shaft are calculated；
Further, following several feelings can be divided into according to its actual conditions when collecting downhole well fluid and measuring its density
Condition considers:
If leakage situation occurs in A1, drilling process in pit shaft, downhole well fluid density value is the close of drilling fluid
Angle value；
If water burst situation occurs in A2, drilling process in pit shaft, need to collect the fluid-like in pit shaft at different location
Product measure the density of each fluid sample and calculate density of the average value as downhole well fluid；
If water burst situation occurs for A3, coal bed gas well, downhole well fluid density value is the density value of mining output water；
Further, it is as follows to calculate analysis pit shaft pressure sensor data step:
S4.1, the shaft bottom hydraulic data acquired according to step S2 make at pressure sensor in pit shaft hydraulic P T at any time
Change curve, and make the change curve of the hydraulic change rate dP/dT in shaft bottom T at any time；
S5.2, the pit shaft acquired in the density value ρ, the step S2 that correspond to oil/gas well downhole well fluid is determined according to step S3
The decentralization vertical depth H of pressure sensor makes the change curve of the T at any time of liquid level vertical depth h in pit shaft in interior hydraulic P, step S1；
Further, liquid level vertical depth h calculation formula is as follows in pit shaft:
Further, determine that the location method of each lost-circulation zone or water burst layer is as follows in pit shaft:
S5.1, according to the change curve of the hydraulic change rate dP/dT in the shaft bottom made in step S4.1 T at any time, on curve
Inflection point quantity be lost-circulation zone or water burst layer quantity；
S5.2, according to the change curve of the T at any time of liquid level vertical depth h in the pit shaft made in step S4.2, in conjunction with step
The vertical depth at the place of inflection point can determine whether each leakage to the hydraulic change rate dP/dT in the shaft bottom made in S4.1 on the change curve of T at any time
The vertical depth for losing layer or water burst layer, further according to the corresponding practical well depth of vertical depth, the position of as each lost-circulation zone or water burst layer；
Further, it is as follows that each lost-circulation zone or the corresponding wastage of water burst layer or water yield Q method in pit shaft are calculated:
S6.1, according to the position of the step S5 each leakage or water burst layer obtained, calculate leakage in pit shaft or water burst layer
Separation delta h；
S6.2, when changing required between the position of each lost-circulation zone or water burst layer according to liquid level in the radius R of pit shaft, pit shaft
Between Δ t calculate corresponding wastage or water yield Q；
Further, in the case of collecting downhole well fluid and while measuring its density is several different, calculate wastage or
It is divided into following two step when water yield Q:
S6.21, it when calculating wastages or water yield Q for two kinds of situations of A1, A2, calculates according to the following formula:
S6.22, wastage is calculated for A3 situation or when water yield Q, is calculated according to the following formula:
In formula, R is the inside radius of protective casing, routFor oil pipe outer radius, rinFor oil pipe inside radius, rrIt is the half of polished rod
Diameter.
The beneficial effects of the present invention are: only pressure sensor need to be disposed in wellbore bottom, and between obtaining hydraulic data i.e.
Obtain lost-circulation zone or water burst layer position and corresponding amount, the data acquisition of the hydraulic data of high precision and short interval can obtain
Accurate inflection point helps to determine that corresponding scheme countermeasure provides strong technical support for engineers and technicians.
Detailed description of the invention
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is coal bed gas well first time water burst data analysis result in the present invention；
Fig. 3 is second of water burst data analysis result of coal bed gas well in the present invention；
Fig. 4 is coal bed gas well third time water burst data analysis result in the present invention；
Fig. 5 is three water burst layer positions of coal bed gas well and fluid change schematic diagram in the present invention；
Fig. 6 is three water burst layer positions of coal bed gas well and water yield analysis result in the present invention；
Table 1 is each water burst layer position calculated result in the present invention；
Table 2 is each water burst layer water yield calculated result in the present invention.
Specific embodiment
Be described further below technical solution of the present invention, but claimed range be not limited to it is described.
The present invention will be described by taking High water cut coal bed gas well as an example.
Step 1: selecting a certain High water cut coal bed gas well as research object；
Step 2: installing pressure sensor in the Wellbore of Gas Wells, and the vertical depth H of precise calibration pressure sensor；
Step 3: hydraulic delta data in pit shaft when acquiring termination of pumping three times using borehole pressure sensor, with for the first time
The data instance of acquisition；
Step 4: carry out analytical calculation to collection result, the change of the T at any time of hydraulic P in pit shaft is made at pressure sensor
Change curve, and makes the change curve of the hydraulic change rate dP/dT in shaft bottom T at any time as shown in Fig. 2, wherein dP/dT becomes at any time
The curve of change reflects the recharge rate of water burst layer in pit shaft, is gushed according to the judgement of the situation of change of the change rate dP/dT value of pressure
The situation of change of water layer position, situation of change are analyzed as follows described: dP/dT value forward direction becomes larger, and illustrates that " allogenic water " starts to invade
Pit shaft；DP/dT value reaches maximum value, illustrates that liquid level position at this time starts to contact the first water burst layer A；The decline of dP/dT value forward direction,
Illustrate that liquid level exceeds the first water burst layer A；DP/dT value forward direction declines turning point, illustrates that liquid level starts to contact the second water burst in pit shaft
Layer B；When dP/dT value forward direction tends towards stability, illustrate that liquid level tends towards stability D, liquid level at this time is almost close to earth's surface；DP/dT value is negative
To becoming larger, illustrate that liquid level is begun to decline；DP/dT value negative sense turnover C point, illustrates that mining speed and recharge rate start to refuse to budge,
Just since liquid level falls below B at the second water burst layer, supply water starts to increase, and causes liquid level to reduce slack-off；Change rate negative sense becomes
In stabilization, illustrate that fluid column and the outer liquid level of well have re-established balance in well.
Step 5: calculating position and the water yield of each water burst layer in conjunction with Fig. 2 according to the analysis of the 4th step:
A. the first water burst layer: the peak value of dP/dT curve changes between 0.0128~0.0124MPa/min, and corresponding liquid
Pressure P is 0.704~0.896MPa, and the change in location range of the first water burst layer is liquid level rising after 115.7~134.8m termination of pumping
Height Δ h1For 34.1~53.3m, the time T which needs is 30~45min, then the increased fluid volume in pit shaft
V1Calculation formula is as follows:
V1=S Δ h1
S=π R2-π(rout 2-rin 2)-πrr 2
S is effective liquid cross-sectional product in pit shaft, V in formula1It is that (three water burst layers gush increased fluid volume in pit shaft
Water summation), Δ h1To the lifting height of the first water burst layer, R is the radius of pit shaft, r for hydrostatic level positionoutFor oil pipe outer radius,
rinFor oil pipe inside radius, three water burst layers at the first water burst layer for being calculated according to coal bed gas well water yield Q calculation formula it is total
Water yield is 1.07m3/h；
B. the second water burst layer: dP/dT point of inflexion on a curve changes between 0.0040~0.0032MPa/min, and corresponding liquid
Pressure P is 1.378~1.446MPa, and the change in location range of the second water burst layer is 60.7~67.5m, and liquid level rises after termination of pumping
Height Δ h2For 55.0~67.3m, the time T which needs is 90~85min, according to V in a1Calculation formula and coal bed gas
The total yield that well yield Q calculation formula calculates both the above water burst layer at the second water burst layer is 0.65m3/h；
C. third water burst layer: the pressure of fluid column is 1.928MPa, and corresponding liquid level lifting height is 60.7~67.5m, should
The time T that process needs is 385~390min, according to V in a1Calculation formula and coal bed gas well water yield Q calculation formula calculate the
Water yield at one water burst layer is 0.16m3/h。
It is 0.16m according to the above-mentioned third water burst layer water yield that be calculated3/ h, the second water burst layer water yield are 0.49m3/ h,
The water yield of first water burst layer is 0.42m3/h。
Repeat the above process it is calculating second acquisition data and third time acquisition data as a result, as shown in Figure 3, Figure 4, will
Table is made in three groups of calculated results, and as shown in table 1, table 2, liquid level rising schematic diagram is shown in Fig. 5 after the coal bed gas well termination of pumping, the coal seam
Three water burst layer positions of gas well and water yield analysis result are shown in Fig. 6.
Table 1
Table 2.
Claims (5)
1. the analysis method that a kind of pit shaft includes creviced formation position, which is characterized in that steps are as follows:
S1, pressure sensor, the decentralization vertical depth H of calibrating (base measuring) pressure sensor are transferred in pit shaft；
S2, the hydraulic data changed over time in production wells bottom；
S3, it collects downhole well fluid and measures its density；
S4, make the hydraulic change rate dP/dT in shaft bottom at any time in the change curve and pit shaft of T liquid level vertical depth h T at any time variation
Curve；
S5, the position for determining each lost-circulation zone or water burst layer in pit shaft；
S6, the wastage or water yield Q of each lost-circulation zone or water burst layer in pit shaft are calculated.
2. the analysis method that a kind of pit shaft as described in claim 1 includes creviced formation position, which is characterized in that make shaft bottom
Steps are as follows for the change curve of liquid level vertical depth h T at any time in the change curve and pit shaft of T at any time by hydraulic change rate dP/dT:
S4.1, the shaft bottom hydraulic data acquired according to step S2 make at pressure sensor the change of the T at any time of hydraulic P in pit shaft
Change the change curve of curve and the hydraulic change rate dP/dT in shaft bottom T at any time；
It is hydraulic in the pit shaft acquired in S4.2, density value ρ, step S3 according to the determining corresponding oil/gas well downhole well fluid of step S4
P, the decentralization vertical depth H of pressure sensor makes the change curve of the T at any time of liquid level vertical depth h in pit shaft in step S2；
Liquid level vertical depth h calculation formula is as follows in pit shaft:
3. the analysis method that a kind of pit shaft as described in claim 1 includes creviced formation position, which is characterized in that determine pit shaft
The location method of interior each lost-circulation zone or water burst layer is as follows:
S5.1, according to the change curve of the hydraulic change rate dP/dT in the shaft bottom made in step S4.1 T at any time, turning on curve
Point quantity is the quantity of lost-circulation zone or water burst layer；
S5.2, according to the change curve of the T at any time of liquid level vertical depth h in the pit shaft made in step S4.2, in conjunction in step S4.1
The hydraulic change rate dP/dT in the shaft bottom made at any time judge each lost-circulation zone or gush on the change curve of T by the vertical depth at the place of inflection point
The vertical depth of water layer is the position of each lost-circulation zone or water burst layer further according to the corresponding practical well depth of vertical depth.
4. the analysis method that a kind of pit shaft as described in claim 1 includes creviced formation position, which is characterized in that calculate pit shaft
Interior each lost-circulation zone or the corresponding wastage of water burst layer or water yield Q method are as follows:
S6.1, the respectively position of leakage or water burst layer obtained according to step S5, calculate the spacing of leakage or water burst layer in pit shaft
Δh；
S6.2, required time Δ is changed between the position of each lost-circulation zone or water burst layer according to liquid level in the radius R of pit shaft, pit shaft
T calculates wastage or water yield Q.
5. the analysis method that a kind of pit shaft as claimed in claim 4 includes creviced formation position, which is characterized in that for collecting
Downhole well fluid simultaneously measures several different situations when its density, and following steps calculating is divided into when calculating wastage or water yield Q:
S6.21, it when calculating wastages or water yield Q for two kinds of situations of A1, A2, calculates according to the following formula:
S6.22, wastage is calculated for A3 situation or when water yield Q, is calculated according to the following formula:
In formula, R is the inside radius of protective casing, routFor oil pipe outer radius, rinFor oil pipe inside radius, rrFor the radius of polished rod.
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