CN115075782A - Depth correction method for oil pipe transmission perforation - Google Patents
Depth correction method for oil pipe transmission perforation Download PDFInfo
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- CN115075782A CN115075782A CN202110260459.5A CN202110260459A CN115075782A CN 115075782 A CN115075782 A CN 115075782A CN 202110260459 A CN202110260459 A CN 202110260459A CN 115075782 A CN115075782 A CN 115075782A
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- 210000002445 nipple Anatomy 0.000 claims description 28
- 230000000977 initiatory effect Effects 0.000 claims description 21
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- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
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- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/119—Details, e.g. for locating perforating place or direction
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- 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
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Abstract
The application provides a depth correction method for oil pipe transmission perforation, and belongs to the technical field of oil field development. The method comprises the following steps: sequentially installing an oil pipe short joint, an isolation oil pipe and a perforation device at the lower end of the oil pipe; the method comprises the steps of putting an oil pipe into a construction well, wherein the length of the oil pipe is matched with a first depth of a target layer to be perforated; the logging instrument is put into an oil pipe, and if the logging instrument is blocked in the oil pipe, the logging instrument is pushed to a short section of the oil pipe by injecting liquid into the oil pipe; after the logging instrument reaches the oil pipe short section, measuring a logging curve of the construction well through the logging instrument; based on the logging curve and the length of the isolation oil pipe, the length of the oil pipe is adjusted, so that the perforating device is aligned to the target layer.
Description
Technical Field
The application relates to the technical field of oilfield development, in particular to a depth correction method for oil pipe transmission perforation.
Background
In the process of oil field development, perforation operation is an essential important process after casing completion; the perforation operation is that after the perforation device is put into a mining target layer in the well, the casing and the cement sheath of the target layer are perforated through the perforation device, so that the stratum to which the target layer belongs is communicated with the well shaft, and further, oil gas of the stratum can enter the well shaft. To ensure that the perforating device is accurately aligned with the formation of interest, the depth of the perforating device within the wellbore needs to be calibrated.
In the related art, after a logging curve is measured by a logging instrument which penetrates into a target layer, the depth of a perforating device is determined based on the logging curve, and then the depth of the perforating device is adjusted based on the error between the depth of the perforating device and the target layer. Because the logging instrument can only reach the position with the well deflection smaller than 60 degrees, when the well deflection of the position of the target layer is larger than 60 degrees, the logging instrument is difficult to fall into the target layer, the depth of the logging curve measured by the logging instrument only reaches the position with the well deflection smaller than 60 degrees, the depth of the position with the well deflection larger than 60 degrees and the position with the target layer can only be determined by the length of the underground oil pipe, the depth of the perforating device is further determined by the length of the oil pipe and the depth of the logging curve together, but the length of the oil pipe has errors due to the fact that the oil pipe is likely to stretch and deform underground, and therefore when the depth of the perforating device is adjusted based on the length of the oil pipe and the depth of the logging curve, the perforating device cannot accurately align to the target layer, and the perforating accuracy of the perforating device is low.
Disclosure of Invention
The embodiment of the application provides a depth correction method for oil pipe transmission perforation, which can improve the perforation accuracy of a perforating device. The technical scheme is as follows:
in one aspect, a method for depth correction of tubing conveyed perforations is provided, the method comprising:
sequentially installing an oil pipe short joint, an isolation oil pipe and a perforation device at the lower end of the oil pipe;
the oil pipe is put into a construction well, wherein the length of the oil pipe is matched with the first depth of a target layer to be perforated;
a logging instrument is put into the oil pipe, and if the logging instrument meets resistance in the oil pipe, the logging instrument is pushed to the short section of the oil pipe by injecting liquid into the oil pipe;
after the logging instrument reaches the oil pipe short section, measuring a logging curve of the construction well through the logging instrument;
and adjusting the length of the oil pipe based on the logging curve and the length of the isolation oil pipe to enable the perforating device to be aligned to the target layer.
In one possible implementation, the perforating device comprises a perforating gun and a ball shooting initiation assembly;
install oil pipe nipple joint, isolation oil pipe and perforating device in proper order at oil pipe's lower extreme, include:
the oil pipe short section, the isolation oil pipe, the ball throwing initiation assembly and the perforating gun are sequentially installed at the lower end of the oil pipe, wherein the oil pipe short section is installed at the lower end of the oil pipe, the isolation oil pipe is installed at the lower end of the oil pipe short section, the ball throwing initiation assembly is installed at the lower end of the isolation oil pipe, and the perforating gun is installed at the lower end of the ball throwing initiation assembly.
In one possible implementation, the method further includes:
after the perforating device is aligned with the target layer, the perforating gun is detonated through the ball throwing initiation assembly, so that the perforating gun perforates the target layer.
In one possible implementation, the ball firing initiation assembly includes a detonator firing pin and a pressure shear member, and the firing of the perforating gun by the ball firing initiation assembly includes:
a steel ball is put into the oil pipe through a pump truck, so that the steel ball blocks the upper end of the pressure shearing part;
pressing the oil pipe to a preset pressure through a pump truck, and shearing a shearing pin on the pressure shearing component;
and after the shearing pin is sheared, the detonator firing pin falls down to detonate the perforating gun.
In one possible implementation, the adjusting the length of the oil pipe based on the well log and the length of the isolation oil pipe to align the perforation device with the target zone includes:
determining a second depth of the tubing sub based on the log;
determining a third depth of the perforating device based on the second depth and the length of the isolation tubing;
and adjusting the length of the oil pipe based on the difference between the third depth and the first depth to enable the perforating device to be aligned with the target layer.
In one possible implementation, the well log includes a first natural gamma curve and a first tubing collar curve, the first natural gamma curve includes gamma values of a plurality of sampling points of the construction well, the first tubing collar curve includes collar values of the plurality of sampling points;
determining a second depth of the tubing sub based on the well log, comprising:
for each sampling point in the first natural gamma curve, acquiring the depth value of the sampling point from a logging interpretation curve of the construction well, wherein the logging interpretation curve is a natural gamma curve marking the depths of the plurality of sampling points;
marking the depth value of the sampling point on the first tubing coupling curve to obtain a second tubing coupling curve;
and determining a target sampling point from the second tubing coupling curve, and taking the depth of the target sampling point as the second depth of the tubing nipple, wherein the target sampling point is a sampling point at which the coupling value generates preset fluctuation.
In one possible implementation, the determining a third depth of the perforating device is based on the second depth and a length of the isolation tubing;
and determining the sum of the second depth and the length of the isolation oil pipe as a third depth of the perforating device.
In one possible implementation, the adjusting the length of the oil pipe based on the difference between the third depth and the first depth to align the perforation device with the target zone includes:
if the difference is positive, reducing the length of the oil pipe corresponding to the difference, and enabling the perforating device to be aligned to the target layer;
and if the difference value is a negative number, increasing the length of the oil pipe corresponding to the difference value to enable the perforating device to be aligned to the target layer.
In one possible implementation, the measuring a logging curve of the construction well by the logging instrument after the logging instrument reaches the tubing sub includes:
after the logging instrument reaches the oil pipe short section, lifting the logging instrument;
and measuring the logging curve of the construction well through the logging instrument in the process of lifting the logging instrument.
In a possible implementation manner, the running a logging instrument into the oil pipe, if the logging instrument encounters a resistance in the oil pipe, pushing the logging instrument to the tubing nipple by injecting a liquid into the oil pipe includes:
measuring a third tubing coupling curve of the construction well by the logging instrument in the process of running the logging instrument into the tubing;
if the collar value of the third tubing collar curve at a second target depth is not changed, determining that the logging instrument is subjected to blockage at the second target depth;
and if the coupling value of the third tubing coupling curve at a third target depth fluctuates in a preset manner, determining that the third target depth is the tubing nipple.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
the embodiment of the application provides a depth correction method for oil pipe transmission perforation, and in the method, when a logging instrument encounters resistance in an oil pipe inserted below the logging instrument, the logging instrument can be pushed to a pipe nipple through injecting liquid into the oil pipe, so that the length of the oil pipe can be accurately measured through a logging curve of a construction well measured by the logging instrument, the length of the oil pipe can be accurately adjusted based on the logging curve, and a perforation device is aligned to a target layer; therefore, the method can enable the perforating device to be accurately aligned with the target layer, and further improve the accuracy of the perforating device in perforating the target layer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a depth correction method for tubing conveyed perforation according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The application provides a depth correction method for oil pipe transmission perforation, and with reference to fig. 1, the method comprises the following steps:
step 101: and sequentially installing the oil pipe nipple, the isolation oil pipe and the perforating device at the lower end of the oil pipe.
Wherein, the perforating device comprises a perforating gun and a ball throwing detonating assembly.
In the step, an oil pipe short joint, an isolation oil pipe, a ball throwing detonation assembly and a perforating gun are sequentially arranged at the lower end of the oil pipe; the oil pipe short section is installed at the lower end of the oil pipe, the isolation oil pipe is installed at the lower end of the oil pipe short section, the ball throwing detonation component is installed at the lower end of the isolation oil pipe, and the perforating gun is installed at the lower end of the ball throwing detonation component.
The oil pipe nipple is used for marking the position of the perforating device, and the isolation oil pipe is used for connecting the oil pipe nipple and the perforating device; the length of the oil pipe short section is short and can be ignored, the length of the isolation oil pipe can be set and changed according to needs, and in the embodiment of the application, specific limitation is not made on the length; for example, the length of the isolation tubing may be 20-30 meters.
The connection mode between the oil pipe and the oil pipe nipple, the connection mode between the oil pipe nipple and the isolation oil pipe, the connection mode between the isolation oil pipe and the ball throwing detonating assembly and the connection mode between the ball throwing detonating assembly and the perforating gun can be threaded connection.
Step 102: and (5) putting the oil pipe into the construction well.
Wherein, the oil pipe can be put into the construction well through a crane; the length of the tubing is matched to a first depth of a target zone to be perforated.
The target layer to be perforated is a gas storage layer or an oil storage layer for storing oil and gas, and the first depth of the target layer can be acquired from logging information of a construction well.
The first depth of the target layer to be perforated is larger than the length of the oil pipe and is equal to the sum of the length of the oil pipe and the length of the isolation oil pipe.
The construction well can be a small-inclination well with a well deviation smaller than 60 degrees, a high-inclination well with a well deviation larger than 60 degrees or a horizontal well.
Step 103: and (3) putting the logging instrument into the oil pipe, and if the logging instrument is blocked in the oil pipe, pushing the logging instrument to the short section of the oil pipe by injecting liquid into the oil pipe.
The logging instrument is used for measuring a logging curve of a construction well.
The pump truck pumps liquid into the oil pipe, the liquid can be any liquid, for example, the liquid can be water, the water can meet the requirement of generating driving force at the bottom of a well, the water is cheap and easy to obtain, the components are simple, and pollution or corrosion to a construction well cannot be caused. After the logging instrument meets the resistance in the oil pipe, water is injected into the oil pipe at a certain displacement through the pump truck, so that the logging instrument generates a piston effect in the oil pipe, and then the logging instrument can be pushed to continue to move downwards through the thrust generated by the piston effect until the logging instrument is pushed to the short section of the oil pipe.
Because the logging instrument descends through the dead weight of the logging instrument and the logging cable in the process of descending the oil pipe, if the target layer to be perforated is positioned at the position with the well inclination less than 60 degrees, the logging instrument can directly descend to the target layer; if the target layer to be perforated is located at a position with a well inclination larger than 60 degrees, the friction force is too large due to the fact that the downward gravity component of the logging instrument and the logging cable in the vertical direction is increased, the logging instrument and the logging cable cannot go down, the logging instrument cannot go down to the target layer, namely the logging instrument cannot go down to the target layer by means of the gravity of the logging instrument and the gravity of the logging cable, and therefore the logging instrument cannot log the logging curve of the target layer. And in this application embodiment, when logging instrument meets when hindering under the position that the well deviation is greater than 60, can be through injecting liquid with logging instrument propelling movement to oil pipe nipple joint department into to oil pipe, make logging instrument can measure the logging curve of target zone.
Measuring a third tubing coupling curve of the construction well by the logging instrument in the process of putting the logging instrument into the tubing; the third tubing coupling curve includes coupling values for a plurality of sampling points.
In one possible implementation, if the collar value of the third tubing collar curve does not change at the second target depth, it is determined that the logging instrument is experiencing a blockage at the second target depth.
The logging instrument measures a third tubing coupling curve in the descending process, if the logging instrument descends smoothly all the time, the third tubing coupling curve extends downwards all the time in the longitudinal direction, if the coupling value of the third tubing coupling curve at the second target depth is not changed, namely the third tubing coupling curve does not extend downwards any more in the longitudinal direction, the logging instrument does not descend any more, the logging instrument is determined to be blocked at the second target depth, and therefore the descending condition of the logging instrument in the tubing can be judged quickly and visually through the third tubing coupling curve, and the construction operation can be adjusted in time.
In another possible implementation, if the collar value of the third tubing collar curve at the third target depth fluctuates by a predetermined amount, the third target depth is determined to be the tubing nipple.
Wherein the predetermined fluctuation is a lateral fluctuation in coupling value at a depth on the third coupling curve due to the coupling value at the depth being greater than the coupling values at the upper and lower depths thereof.
The logging instrument measures a third tubing coupling curve in a descending process, and the third tubing coupling curve has logging response characteristics at a tubing nipple, namely the coupling value on the third tubing coupling curve has preset fluctuation; if the coupling value on the third tubing coupling curve fluctuates in a preset manner, the logging instrument reaches the tubing nipple, and then the logging instrument stops going downwards, so that whether the logging instrument reaches the tubing nipple can be judged quickly and visually through the third tubing coupling curve, and the construction operation can be adjusted in time.
Step 104: and after the logging instrument reaches the short section of the oil pipe, measuring the logging curve of the construction well through the logging instrument.
This step can be realized by the following steps (1) to (2):
(1) and after the logging instrument reaches the oil pipe short joint, lifting the logging instrument upwards.
Wherein the logging instrument is lifted over the logging cable.
(2) And in the lifting process of the logging instrument, measuring the logging curve of the construction well through the logging instrument.
The logging instrument descends by depending on the weight of the logging instrument and the logging cable in the process of descending the oil pipe, and the logging cable is easy to curl and wind, so that a third tubing coupling curve measured by the logging instrument can only qualitatively judge the descending condition of the logging instrument and whether the third tubing coupling curve reaches a short joint of the oil pipe or not; and in the process of lifting the logging instrument through the logging cable, the logging cable is in a straightening state, so that the logging instrument can accurately measure a logging curve, and the accuracy of the measured logging curve is high.
Step 105: based on the logging curve and the length of the isolation oil pipe, the length of the oil pipe is adjusted, and the perforating device is aligned to the target layer.
This step can be realized by the following steps (1) to (3):
(1) and determining a second depth of the tubing nipple based on the logging curve.
The well logging curve comprises a first natural gamma curve and a first tubing coupling curve, the first natural gamma curve comprises gamma values of a plurality of sampling points of a construction well, and the first tubing coupling curve comprises coupling values of the plurality of sampling points.
The positions of a plurality of sampling points of the first natural gamma curve are the same as the positions of a plurality of sampling points of the first tubing coupling curve; the positions of the plurality of sampling points may be set and changed as needed, and are not particularly limited herein.
This step can be achieved by the following steps a 1-A3:
a1: for each sampling point in the first natural gamma curve, acquiring the depth value of the sampling point from a logging interpretation curve of the construction well; wherein the well logging interpretation curve is a natural gamma curve labeling depths of a plurality of sampling points.
The plurality of sampling points in the well logging interpretation curve are the same as the plurality of sampling points in the first natural gamma curve in position, namely the depths of the plurality of sampling points in the well logging interpretation curve are the same as the depths of the plurality of sampling points in the first natural gamma curve.
Since the natural gamma curve is used to reflect the total content of the radionuclide in the formation, the natural gamma curve measured at any one time is the same. In this step, the first natural gamma curve is overlapped with the natural gamma curve on the logging interpretation curve, so that the depth values of the sampling points in the first natural gamma curve can be obtained based on the depth values of the sampling points in the natural gamma curve in the logging interpretation curve.
A2: and marking the depth value of the sampling point on the first tubing coupling curve to obtain a second tubing coupling curve.
The depth values of the sampling points in the acquired first natural gamma curve are the depth values of the sampling points in the first tubing coupling curve, and then the depth values of the sampling points in the acquired first natural gamma curve are marked on the first tubing coupling curve, so that the tubing coupling curve marking the depths of the sampling points can be obtained.
A3: and determining a target sampling point from the second tubing coupling curve, taking the depth of the target sampling point as the second depth of the tubing nipple, and taking the target sampling point as the sampling point of the coupling value subjected to preset fluctuation.
(2) A third depth of the perforating device is determined based on the second depth and the length of the isolation tubing.
And determining the sum of the second depth and the length of the isolation oil pipe as the third depth of the perforating device.
(3) And adjusting the length of the oil pipe based on the difference between the third depth and the first depth to enable the perforating device to be aligned to the target layer.
This step can be implemented by any one of the following implementations:
in one possible implementation, if the difference is positive, the length of the tubing corresponding to the difference is decreased, and the perforating device is aligned with the target zone.
If the difference value is a positive number, the perforating device is located below the target layer, the length corresponding to the difference value of the oil pipe is reduced by cutting the oil pipe, and after the oil pipe is cut short, the perforating device is lifted up, so that the perforating device is aligned to the target layer.
In another possible implementation, if the difference is negative, the length of the oil pipe corresponding to the difference is increased, so that the perforating device is aligned with the target layer.
If the difference value is a negative number, the perforating device is located above the target layer, another oil pipe is connected to the oil pipe, the length of the oil pipe corresponding to the difference value is increased, and after the length of the oil pipe is increased, the perforating device is lowered, so that the perforating device is aligned to the target layer.
The depth correction method for the oil pipe transmission perforation provided by the embodiment of the application has the operation time of 4-6 hours. Because the depth correction method of oil pipe transmission perforation that this application embodiment provided can be with logging instrument down to oil pipe nipple joint department, can make logging instrument measure the well logging curve of oil pipe nipple joint department like this, and then can confirm the second degree of depth of oil pipe nipple joint based on the well logging curve, and because oil pipe nipple joint and perforating device are connected through keeping apart oil pipe, the third degree of depth of perforating device just can be confirmed to second degree of depth through oil pipe nipple joint like this and the length of keeping apart oil pipe, and then adjust the length of oil pipe based on the error of the first degree of depth of third degree of depth and target layer, just can make the perforating device aim at the target layer through once correcting. The method avoids the error of the length of the oil pipe caused by the error caused by the well track and the stretching and friction of the pipe column when the depth of the perforating device is corrected through the length of the oil pipe; therefore, the correction method provided by the embodiment of the application can be used for correcting depth at one time, is time-saving and labor-saving, and greatly improves the accuracy and efficiency of perforation.
The embodiment of the application provides a depth correction method for oil pipe transmission perforation, and in the method, when a logging instrument encounters resistance in an oil pipe inserted below the logging instrument, the logging instrument can be pushed to a pipe nipple through injecting liquid into the oil pipe, so that the length of the oil pipe can be accurately measured through a logging curve of a construction well measured by the logging instrument, the length of the oil pipe can be accurately adjusted based on the logging curve, and a perforation device is aligned to a target layer; therefore, the method can enable the perforating device to be accurately aligned to the target layer, and further can improve the accuracy of the perforating device in perforating the target layer.
In the embodiment of the present application, through the steps 101-105, the perforation device can be aligned with the destination layer; the embodiment of the present application may also perform the following step 106 to perforate the target zone with the perforating device.
Step 106: after the perforating device is aligned with the target layer, the perforating gun is detonated through the ball throwing detonating assembly, so that the perforating gun perforates the target layer.
The pitching initiation assembly comprises a detonator firing pin and a pressure shearing component.
This step can be realized by the following steps (1) to (3):
(1) and (4) putting the steel ball into the oil pipe through the pump truck, so that the steel ball blocks the upper end of the pressure shearing component.
Before the steel ball is put into an oil pipe, a Christmas tree is installed at the wellhead of a construction well, the steel ball penetrates through the Christmas tree and enters the oil pipe, and then is pumped to the upper end of the pressure shearing component through the pump truck to be pressed, so that the steel ball blocks the upper end of the pressure shearing component.
The pressure monitoring device of the construction well monitors the pressure in the oil pipe, and after the pressure monitoring device displays that the oil pipe has pressure, the steel ball reaches the upper end of the pressure shearing component.
(2) And (4) pressing the oil pipe to a preset pressure through the pump truck, so that the shearing pin on the pressure shearing component is sheared.
After the pressure monitoring device displays that the oil pipe is pressurized, the oil pipe is continuously pressurized to a preset pressure through the pump truck, and the preset pressure can cut off the shearing pin on the fracturing shearing component.
The steel ball is plugged at the upper end of the pressure shearing component, when the oil pipe is pressurized through the pump truck, the pressure of the upper end face of the pressure shearing component is larger than the pressure of the lower end face of the pressure shearing component, and when the pressure of the upper end face of the fracturing shearing component reaches the preset pressure, the shearing pin on the fracturing shearing component is sheared under the preset pressure due to the pressure difference between the upper end face of the pressure shearing component and the lower end face of the pressure shearing component.
(3) After the shearing pin is sheared, the detonator firing pin falls down to fire the perforating gun.
Wherein, the detonator firing pin is used for detonating the perforating gun; before the shearing pin is sheared, the detonator firing pin is fixed above the perforating gun through the pressure shearing pin, and after the shearing pin is sheared, the detonator firing pin is unlocked, falls down, and detonates the perforating gun to perforate a target layer.
The ball throwing detonation component is provided with a circulating hole, and is used for enabling liquid to flow out of the oil pipe through the circulating hole when the liquid pushing logging instrument descends in the oil pipe, and used as a production channel of an oil-gas layer after perforation operation is completed.
When the perforation is performed in a highly deviated well with the well inclination of more than 60 degrees, a pressure ignition initiation device is generally adopted to initiate a perforating gun to perforate a target layer, and when the fluctuation pressure of the well bottom reaches the set pressure of the action of the initiation device, the initiation device acts to initiate the perforating gun. Because the depth correction method that this application embodiment provided adopts the mode through pump truck hydraulic pumping to promote logging instrument to oil pipe nipple joint department, like this, have certain pumping pressure in the oil pipe, liquid receives factors influences such as passageway latus rectum, liquid friction resistance, passageway jam simultaneously, and the shaft bottom can produce the pressure fluctuation, causes the mistake perforation, brings huge loss and well control risk. And this application adopts the ball blasting initiation subassembly to detonate the perforating gun, after the perforating device aligns the target layer, just drop into the steel ball to suppress pressure in the well, make the action of ball blasting initiation subassembly, detonate the perforating gun, like this, ball blasting initiation subassembly is before not pitching the operation, can not detonate the perforating gun because of the high pressure accident that the shaft bottom pressure fluctuation produced, be a safe pressure initiating device, very big reduction the mistake perforation risk of pumping logging instrument in-process, avoided the loss that the mistake perforation caused, the efficiency of perforation operation has been improved.
The embodiment of the application provides a depth correction method for oil pipe transmission perforation, and in the method, when a logging instrument encounters resistance in an oil pipe inserted below the logging instrument, the logging instrument can be pushed to a pipe nipple through injecting liquid into the oil pipe, so that the length of the oil pipe can be accurately measured through a logging curve of a construction well measured by the logging instrument, the length of the oil pipe can be accurately adjusted based on the logging curve, and a perforation device is aligned to a target layer; therefore, the method can enable the perforating device to be accurately aligned to the target layer, and further can improve the accuracy of the perforating device in perforating the target layer.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method of depth correction of a tubing conveyed perforation, the method comprising:
sequentially installing an oil pipe short joint, an isolation oil pipe and a perforation device at the lower end of the oil pipe;
the oil pipe is put into a construction well, wherein the length of the oil pipe is matched with the first depth of a target layer to be perforated;
a logging instrument is put into the oil pipe, and if the logging instrument meets resistance in the oil pipe, the logging instrument is pushed to the short section of the oil pipe by injecting liquid into the oil pipe;
after the logging instrument reaches the oil pipe short section, measuring a logging curve of the construction well through the logging instrument;
and adjusting the length of the oil pipe based on the logging curve and the length of the isolation oil pipe to enable the perforating device to be aligned to the target layer.
2. The method of depth correction of tubing conveyed perforations of claim 1, wherein the perforating device comprises a perforating gun and a ball drop initiation assembly;
install oil pipe nipple joint, isolation oil pipe and perforating device in proper order at oil pipe's lower extreme, include:
the oil pipe short section, the isolation oil pipe, the ball throwing initiation assembly and the perforating gun are sequentially installed at the lower end of the oil pipe, wherein the oil pipe short section is installed at the lower end of the oil pipe, the isolation oil pipe is installed at the lower end of the oil pipe short section, the ball throwing initiation assembly is installed at the lower end of the isolation oil pipe, and the perforating gun is installed at the lower end of the ball throwing initiation assembly.
3. The method of depth correction of tubing conveyed perforations of claim 2, further comprising:
after the perforating device is aligned with the target layer, the perforating gun is detonated through the ball throwing initiation assembly, so that the perforating gun perforates the target layer.
4. The method of depth correction of tubing conveyed perforations of claim 3, wherein said ball launching initiation assembly comprises a detonator firing pin and a pressure shear member, said firing of said perforating gun by said ball launching assembly comprising:
a steel ball is put into the oil pipe through a pump truck, so that the steel ball blocks the upper end of the pressure shearing component;
pressing the oil pipe to a preset pressure through a pump truck, and shearing a shearing pin on the pressure shearing component;
and after the shearing pin is sheared, the detonator firing pin falls down to detonate the perforating gun.
5. The method of depth correction for tubing conveyed perforations of claim 1, wherein said adjusting the length of the tubing based on the well log and the length of the isolation tubing to align the perforating device with the destination comprises:
determining a second depth of the tubing sub based on the log;
determining a third depth of the perforating device based on the second depth and the length of the isolation tubing;
and adjusting the length of the oil pipe based on the difference between the third depth and the first depth to enable the perforating device to be aligned with the target layer.
6. The method of depth correction of tubing conveyed perforations of claim 5, wherein the log curve comprises a first natural gamma curve and a first tubing collar curve, the first natural gamma curve comprising gamma values for a plurality of sampling points of the construction well, the first tubing collar curve comprising collar values for the plurality of sampling points;
determining a second depth of the tubing sub based on the log, comprising:
for each sampling point in the first natural gamma curve, acquiring the depth value of the sampling point from a logging interpretation curve of the construction well, wherein the logging interpretation curve is a natural gamma curve marking the depths of the plurality of sampling points;
marking the depth values of the sampling points on the first tubing coupling curve to obtain a second tubing coupling curve;
and determining a target sampling point from the second tubing coupling curve, and taking the depth of the target sampling point as the second depth of the tubing nipple, wherein the target sampling point is a sampling point at which the coupling value generates preset fluctuation.
7. The method of depth correction for tubing conveyed perforations of claim 5, wherein the determining a third depth of the perforating device is based on the second depth and a length of the isolation tubing;
and determining the sum of the second depth and the length of the isolation oil pipe as a third depth of the perforating device.
8. The method of claim 5, wherein adjusting the length of the tubing to align the perforating device with the destination based on the difference between the third depth and the first depth comprises:
if the difference is positive, reducing the length of the oil pipe corresponding to the difference, and enabling the perforating device to be aligned to the target layer;
and if the difference value is a negative number, increasing the length of the oil pipe corresponding to the difference value to enable the perforating device to be aligned to the target layer.
9. The method of depth correction of tubing conveyed perforations of claim 1, wherein said measuring a log of said construction well by said logging instrument after said logging instrument reaches said tubing sub comprises:
after the logging instrument reaches the oil pipe short joint, lifting the logging instrument;
and measuring the logging curve of the construction well through the logging instrument in the lifting process of the logging instrument.
10. The method of depth correction for tubing conveyed perforations of claim 1, wherein said lowering a logging instrument into said tubing and propelling said logging instrument into said tubing sub by injecting a fluid into said tubing if said logging instrument encounters a blockage in said tubing comprises:
measuring a third tubing coupling curve of the construction well by the logging instrument in the process of running the logging instrument into the tubing;
if the collar value of the third tubing collar curve at a second target depth is not changed, determining that the logging instrument is in contact with a blockage at the second target depth;
and if the coupling value of the third tubing coupling curve at a third target depth fluctuates in a preset manner, determining that the third target depth is the tubing nipple.
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| CN202110260459.5A CN115075782B (en) | 2021-03-10 | 2021-03-10 | Depth correction method for oil pipe transmission perforation |
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| CN202110260459.5A CN115075782B (en) | 2021-03-10 | 2021-03-10 | Depth correction method for oil pipe transmission perforation |
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Cited By (1)
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| CN117365396A (en) * | 2023-12-05 | 2024-01-09 | 大庆金祥寓科技有限公司 | Cable type precise old well secondary perforation process and new well secondary perforation process |
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| CN115075782B (en) | 2023-09-26 |
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