CN114607344B - Acid fracturing integrated tubular column and acid fracturing method - Google Patents
Acid fracturing integrated tubular column and acid fracturing method Download PDFInfo
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- CN114607344B CN114607344B CN202011408112.2A CN202011408112A CN114607344B CN 114607344 B CN114607344 B CN 114607344B CN 202011408112 A CN202011408112 A CN 202011408112A CN 114607344 B CN114607344 B CN 114607344B
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- 239000002253 acid Substances 0.000 title claims abstract description 157
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 72
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 230000009471 action Effects 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 210000002445 nipple Anatomy 0.000 claims description 31
- 230000008569 process Effects 0.000 claims description 19
- 239000003129 oil well Substances 0.000 claims description 17
- 239000012530 fluid Substances 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 238000007790 scraping Methods 0.000 claims description 3
- 230000002596 correlated effect Effects 0.000 claims 2
- 238000003825 pressing Methods 0.000 abstract description 7
- 238000007789 sealing Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 11
- 230000008602 contraction Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- 238000009530 blood pressure measurement Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 241000191291 Abies alba Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Sampling And Sample Adjustment (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The application discloses an acid fracturing integrated tubular column and an acid fracturing method, and belongs to the technical field of oil and gas exploitation. The acid-pressing integrated pipe column is put into the sleeve; injecting acid liquor into the oil pipe, discharging well killing liquor from an annular space between the oil pipe and the sleeve, enabling the injection quantity of the acid liquor to reach a preset liquid quantity, setting a Y241 packer, sealing the annular space between the oil pipe and the sleeve and below the packer, applying pressure to the oil pipe, enabling the acid liquor in the oil pipe to be under the action of pressure, discharging the acid liquor into the annular space from the oil pipe, fracturing a stratum from the annular space, entering gaps of the stratum, opening an RDS circulating valve, communicating the oil pipe with the annular space, plugging the oil pipe below the RDS circulating valve, collecting liquid samples in the stratum, measuring the pressure in the oil pipe and the pressure in the sleeve by a pressure gauge support cylinder, and uploading the measured pressure to control equipment. The acid fracturing integrated tubular column is simple in structure, convenient to use, capable of simultaneously completing acid fracturing and testing, and complete in function.
Description
Technical Field
The application relates to the technical field of oil and gas exploitation, in particular to an acid fracturing integrated tubular column and an acid fracturing method.
Background
Before petroleum or natural gas is extracted, since the stratum storing the petroleum and the natural gas comprises gaps, the stratum needs to be acidized so that the gaps of the acidized stratum become larger, and the yield of the stratum is improved. An APR (Annular Pressure Responsive, annular pressure response) tool capable of acidizing and testing an oil well, the APR tool comprising: RTTS packer (a packer of one type), RD circulation valve (a circulation valve of one type), RD safety circulation valve (a circulation valve of one type), jar, manometer bracket, hydraulic circulation valve, safety joint, and telescopic joint, etc. However, the APR tool has a complex structure and is inconvenient to use.
Disclosure of Invention
The embodiment of the application provides an acid fracturing integrated tubular column and an acid fracturing method, the acid fracturing integrated tubular column has simple structure, the acid fracturing and testing device is convenient to use, can finish acid fracturing and testing at the same time, and is complete in function. The technical scheme provided by the embodiment of the application is as follows:
In one aspect, an embodiment of the present application provides an acid fracturing integrated tubular string, including: the test tool, the Y241 packer (one type of packer) and the oil pipe are sleeved outside the oil pipe, and the test tool comprises an RDS circulating valve and a pressure gauge supporting cylinder;
in a well killing liquid environment, the acid-fracturing integrated tubular column is put into a casing;
injecting an acid fluid into the tubing, the kill fluid being expelled from an annular space between the tubing and the casing;
The injection amount of the acid liquor reaches a preset liquid amount, the Y241 packer is set, and an annular space which is positioned between the oil pipe and the casing and below the Y241 packer is sealed;
Applying pressure to the tubing, the acid in the tubing being subjected to the pressure, draining from the tubing into the annular space, fracturing a formation from the annular space, and into a slot in the formation;
opening the RDS circulating valve, communicating the oil pipe with the annular space, plugging the oil pipe below the RDS circulating valve, and collecting a liquid sample;
the pressure gauge bracket is used for measuring the pressure in the oil pipe and the casing pipe and uploading the measured pressure to the control equipment.
In one possible implementation manner, the acid fracturing integrated tubular column further comprises a positioning nipple, and the positioning nipple is sleeved outside the oil pipe;
The locating nipple is used for measuring the current depth of the locating nipple.
In another possible implementation, the acid fracturing integrated tubular string includes a telescopic joint; the expansion joint is sleeved on the outer side of the oil pipe;
When the acid-fracturing integrated pipe column expands when encountering heat, the expansion joint stretches to supplement the stretching generated by expansion, and when the acid-fracturing integrated pipe column contracts when encountering cold, the expansion joint shortens to supplement the contraction generated by contraction.
In another possible implementation manner, the acid fracturing integrated tubular column further comprises an RD circulation valve, and the RD circulation valve sleeve is arranged outside the oil pipe;
And opening the RD circulation valve, communicating the oil pipe with the annular space, and plugging the oil pipe below the RD circulation valve.
In another possible implementation manner, the acid fracturing integrated pipe column further comprises a jar, wherein the jar is sleeved outside the oil pipe;
The jar performs jarring and lifts out the acid fracturing integrated pipe column.
In another possible implementation, the maximum pressure that the Y241 packer can withstand is less than 80 megapascals.
In another possible implementation, the acid fracturing integrated string further comprises a ball seat, the ball seat being located at the lower end of the Y241 packer;
And when the ball seat is contacted with the valve ball, the oil pipe is plugged.
On the other hand, the embodiment of the application also provides an acid fracturing method, which is applied to an acid fracturing integrated tubular column, and comprises the following steps: the test tool, the Y241 packer and the oil pipe are sleeved outside the oil pipe, and the test tool comprises an RDS circulating valve and a pressure gauge bracket; the method comprises the following steps:
in a well killing liquid environment, the acid-fracturing integrated tubular column is put into a casing;
injecting an acid fluid into the tubing, the kill fluid being expelled from an annular space between the tubing and the casing;
The injection amount of the acid liquor reaches a preset liquid amount, the Y241 packer is set, and an annular space which is positioned between the oil pipe and the casing and below the Y241 packer is sealed;
Applying pressure to the tubing, the acid in the tubing being subjected to the pressure, draining from the tubing into the annular space, fracturing a formation from the annular space, and into a slot in the formation;
opening the RDS circulating valve, communicating the oil pipe with the annular space, plugging the oil pipe below the RDS circulating valve, and collecting a liquid sample;
the pressure gauge bracket measures the pressure in the oil pipe and the sleeve pipe and uploads the measured pressure to the control equipment.
In one possible implementation manner, the acid fracturing integrated tubular column further comprises a positioning nipple, and the positioning nipple is sleeved outside the oil pipe; the method further comprises the steps of:
and the locating nipple measures the current depth of the locating nipple.
In another possible implementation manner, the acid fracturing integrated tubular column further comprises an RD circulation valve, and the RD circulation valve sleeve is arranged outside the oil pipe; the method further comprises the steps of:
and the RD circulation valve is opened, the oil pipe is communicated with the annular space, and the oil pipe below the RD circulation valve is plugged.
In another possible implementation manner, the acid fracturing integrated pipe column further comprises a jar, wherein the jar is sleeved outside the oil pipe; the method further comprises the steps of:
The jar performs jarring and lifts out the acid fracturing integrated pipe column.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
According to the acid-fracturing integrated pipe column provided by the embodiment of the application, the annular space between the oil pipe and the casing pipe can be sealed through the Y241 packer, the acid liquor in the oil pipe is extruded into the gap of the stratum by applying pressure to the oil pipe, the acidizing treatment of the stratum is completed, the liquid sample in the stratum and the pressure of the oil pipe and the casing pipe can be collected through the testing tool, the testing of the stratum is further completed, the acid-fracturing integrated pipe column is simple in structure, convenient to use and complete in function, and acid fracturing and testing can be completed simultaneously.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an acid fracturing integrated tubular column provided by an embodiment of the application;
fig. 2 is a flow chart of an acid fracturing method provided in an embodiment of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
The acid-fracturing integrated pipe column provided by the embodiment of the application is applied to an oil well acidizing scene, and because gaps exist in the stratum after the well is drilled, in order to improve the condition that oil gas enters the oil well through the gaps, the gaps in the stratum need to be acid-fracturing so as to expand the gaps and increase the yield.
Fig. 1 is a schematic structural diagram of an acid fracturing integrated tubular column provided by an embodiment of the application. Referring to fig. 1, the acid fracturing integrated column comprises: the test tool, Y241 packer 1 and oil pipe, test tool includes RDS circulation valve 2 and manometer bracket 3.
Wherein, testing tool and Y241 packer 1 cover are located the oil pipe outside. In the embodiment of the application, the testing tool is used for testing the stratum, the Y241 packer 1 is used for packing the stratum, and the oil pipe is used for injecting acid liquid into the stratum.
Before the embodiment of the application, firstly, drilling a stratum, then, putting a sleeve into the drilled well, fixing the well through the sleeve, then, putting other tubular columns into the sleeve, and adjusting the well through the other tubular columns to finish oil and gas exploitation.
Before the acid pressure integrated pipe column is put into the casing, the acid pressure integrated pipe column is firstly installed outside the oil pipe according to the installation sequence of an RDS circulating valve 2, a pressure gauge supporting cylinder 3 and a Y241 packer 1 which are included in a testing tool, and the acid pressure integrated pipe column is formed after the installation is finished, and is put into the casing in a well control fluid environment.
Optionally, the testing tool and the Y241 packer 1 are both in threaded connection with the tubing, so that the testing tool and the Y241 packer 1 are sleeved outside the tubing.
Optionally, the acid fracturing integrated tubular column further comprises a positioning nipple 4, and the positioning nipple 4 is sleeved on the outer side of the oil pipe. For example, the locating nipple 4 is located above the test tool, or the locating nipple 4 is located between the test tool and the Y241 packer 1.
The positioning nipple 4 is used for measuring the current depth of the positioning nipple 4. In the process of placing the acid fracturing integrated pipe column, as the positioning nipple 4 is positioned on the acid fracturing integrated pipe column, after the depth is measured through the positioning nipple 4, whether the acid fracturing integrated pipe column is placed at a preset position or not is judged according to the depth, and after the acid fracturing integrated pipe column is placed at the preset position, the placing operation of the acid fracturing integrated pipe column is stopped.
According to the embodiment of the application, the depth of the positioning nipple 4 is measured through the positioning nipple 4, so that the acid-fracturing integrated pipe column is placed at the preset position based on the depth, and the accuracy of the acid-fracturing integrated pipe column is improved.
Before the acid fracturing integrated tubular column is put into, the perforating tubular column is adopted to perforate the sleeve in the well killing liquid environment, so that the oil well and the stratum are communicated through the through holes, and then the sleeve is dredged and scraped to clean impurities in the sleeve, so that the cleaning of the inside of the sleeve is ensured.
After the acid-fracturing integrated tubular column is put into the casing, an annular space is formed between the oil pipe and the casing, the oil pipe also comprises an oil pipe space, and the annular space is communicated with the oil pipe space at the moment. Because the acid-pressure integrated pipe column is put into the casing under the condition of well-killing liquid, well-killing liquid can exist in the oil pipe and the annular space, acid liquid is injected into the oil pipe, the pressure in the oil pipe is gradually increased in the process of injecting the acid liquid, the pressure in the annular space is unchanged, and the acid liquid in the oil pipe can push the well-killing liquid in the annular space under the condition that the pressure in the oil pipe is larger than the pressure in the annular space, so that the well-killing liquid is discharged from the annular space, and the acid liquid is stopped being injected when the injection amount of the acid liquid reaches the preset liquid amount, and the oil pipe is filled with the acid liquid at the moment.
After the acid liquid is injected, the stratum is opened by acid liquid pressure, so that the acid is pressed into gaps of the stratum, and the annular space between the oil pipe and the sleeve is sealed before the acid is pressed into the gaps, so that the acid liquid is prevented from being discharged from the annular space when pressure is applied to the oil pipe. The Y241 packer 1 is located in an annular space, which can be sealed by the Y241 packer 1, so that the annular space below the Y241 packer 1 is in a sealed state.
Optionally, the acid fracturing integrated pipe column comprises a ball seat, the ball seat is located at the lower end of the Y241 packer 1, a valve ball is put into the oil pipe in the setting process of the Y241 packer 1, the valve ball is sunk into the position of the ball seat at the moment, when the ball seat contacts with the valve ball, the oil pipe is plugged, pressure is applied to the oil pipe at the moment, the Y241 packer 1 receives the action of the pressure, the setting process is started to be executed until the setting of the Y241 packer 1 is completed, an annular space between the oil pipe and a casing is sealed, the applied pressure is continuously increased again, so that the ball seat is knocked off, and the valve ball and the ball seat fall into the bottom of the well.
Wherein the maximum pressure that the Y241 packer 1 can withstand is less than 80 mpa. The Y241 packer 1 in the embodiment of the application has a simple structure and high bearable pressure, so that the acid-pressure integrated tubular column is applied to a deep oil-gas well, the situation that the annular space cannot be sealed to cause damage due to overlarge pressure caused by overlarge depth is prevented, and the acid-pressure success rate is improved.
In the embodiment of the application, after the Y241 packer 1 is set, a process of extruding acid liquor into a gap of a stratum is required to be executed, after the Y241 packer 1 is set, an annular space below the Y241 is communicated with the outside only through an oil pipe, at the moment, pressure is applied to the oil pipe, the acid liquor in the oil pipe is subjected to the action of pressure and is discharged into the annular space from the oil pipe, at the moment, the acid liquor contacts the stratum, when the pressure is large enough, the stratum is fractured, and the acid liquor can enter the gap of the stratum from the annular space, so that the reaction between the acid liquor and the gap of the stratum is ensured, and the gap of the stratum is enlarged.
Optionally, in the process of extruding the acid liquor into the gaps of the stratum, the acid liquor in the oil pipe is firstly discharged into the stratum according to smaller discharge capacity, after extruding the acid liquor with fixed liquid quantity, the acid liquor after increasing pressure fracturing the stratum, at the moment, the gaps of the stratum can normally suck the acid liquor, then the discharge capacity is increased, and the acid liquor in the oil pipe is completely discharged into the gaps of the stratum.
The pressure applied to the oil pipe is controlled to control the displacement of the acid liquid squeezed into the gaps of the stratum, and the larger the pressure applied to the oil pipe is, the larger the displacement of the acid liquid squeezed into the gaps of the stratum is.
After the acid liquor in the oil pipe is extruded into a gap in the stratum, oil and gas exploitation can be performed at the moment. In addition, the pressure gauge bracket 3 can be used for measuring the pressure in the oil pipe and the casing, the measured pressure in the oil pipe and the casing in the exploitation process can be uploaded to the control equipment.
After the exploitation and the pressure measurement are completed, the RDS circulation valve 2 is started, the oil pipe is communicated with the annular space, the oil pipe positioned below the RDS circulation valve 2 is plugged, at the moment, the RDS circulation valve 2 can collect a liquid sample in a stratum, and after the acid-pressure integrated pipe column is pulled out, the collected liquid sample in the stratum is obtained.
In the embodiment of the application, the formation parameters such as the yield, the pressure, the liquid property, the permeability and the like of the oil well can be determined through exploitation and pressure measurement, and the exploitation of the formation can be continued according to the measured formation parameters.
Optionally, the acid fracturing integrated pipe column provided by the embodiment of the application adopts the Y241 packer 1 to seal, so that the Y241 packer 1 is suitable for a highly-inclined oil well, and can realize sealing under the condition of large inclination, thereby ensuring that the gap of a stratum is acidified, and expanding the application range of the acid fracturing integrated pipe column.
According to the acid-fracturing integrated pipe column provided by the embodiment of the application, the annular space between the oil pipe and the casing pipe can be sealed through the Y241 packer 1, the acid liquor in the oil pipe is extruded into the gap of the stratum by applying pressure to the oil pipe, the acidizing treatment of the stratum is completed, the liquid sample in the stratum and the pressure of the oil pipe and the casing pipe can be collected through the testing tool, the testing of the stratum is further completed, the acid-fracturing integrated pipe column is simple in structure, convenient to use and complete in function, and acid fracturing and testing can be completed simultaneously.
Optionally, the acid fracturing integrated tubular column provided by the embodiment of the application further comprises an expansion joint 5, and the expansion joint 5 is sleeved on the outer side of the oil pipe. For example, the telescopic joint 5 is located above the Y241 packer 1, or the telescopic joint 5 is located above the test tool, or the telescopic joint 5 is located at other positions.
When the acid-pressure integrated pipe column expands when in heat, the expansion joint 5 stretches to supplement the stretching caused by expansion, and when the acid-pressure integrated pipe column contracts when in cold, the expansion joint 5 shortens to supplement the contraction caused by contraction.
For example, in the process of setting the acid fracturing integrated pipe string, as the depth of the acid fracturing integrated pipe string is deepened continuously, the environmental temperature of the acid fracturing integrated pipe string is also increased continuously, so that the acid fracturing integrated pipe string expands due to the increase of the temperature of the current environment, and the expansion joint 5 can be stretched to replace the stretching caused by the expansion.
In the process of lifting out the acid fracturing integrated pipe column, as the depth of the acid fracturing integrated pipe column continuously becomes shallow, the environmental temperature of the acid fracturing integrated pipe column is also continuously reduced, so that the acid fracturing integrated pipe column can shrink due to the reduction of the temperature of the current environment, and the expansion joint 5 can shrink to replace the shrinkage caused by the shrinkage.
The telescopic joint 5 provided by the embodiment of the application can ensure that the expansion or contraction generated by temperature change is replaced in the process of putting in or out the acid-fracturing integrated pipe column, prevent the acid-fracturing integrated pipe column from being damaged by expansion or contraction, improve the safety of the acid-fracturing integrated pipe column in the construction process, and also improve the success rate of the acid-fracturing integrated pipe column in the construction process.
Optionally, the acid fracturing integrated tubular column provided by the embodiment of the application further comprises an RD circulating valve 6, and the RD circulating valve 6 is sleeved outside the oil pipe. Wherein the RD circulation valve 6 is located below the test tool, or the RD circulation valve 6 is located above the test tool, or the RD circulation valve 6 is located elsewhere.
In the embodiment of the present application, the RD circulation valve 6 is a backup valve, and when the RDs circulation valve 2 cannot be opened, the RD circulation valve 6 is opened, so that the RD circulation valve 6 replaces the RDs circulation valve 2, and the oil pipe is communicated with the annular space, so that the oil pipe below the RD circulation valve 6 is plugged. And in the case where RDS circulation valve 2 can be normally opened, RD circulation valve 6 is kept closed.
The RDs circulation valve 6 can also be replaced by the RDs circulation valve 2, and embodiments of the present application are not limited thereto.
According to the embodiment of the application, the RD circulation valve 6 is used as a standby valve, and the RD circulation valve 6 is opened under the condition that the RDS circulation valve 2 cannot be opened, so that the normal operation of a construction flow is ensured, the accuracy of a construction process is improved, and the safety of construction is also ensured.
Optionally, the acid fracturing integrated pipe column in the embodiment of the application further comprises a jar 7, and the jar 7 is sleeved outside the oil pipe. Wherein the jar 7 is located above the Y241 packer 1, or the jar 7 is located above the testing tool, or the jar 7 is located elsewhere.
In the embodiment of the application, if the acid-fracturing integrated pipe column is used for completing construction, the acid-fracturing integrated pipe column is required to be unsealed subsequently, and then the acid-fracturing integrated pipe column is lifted out of an oil well, and the unsealing of the acid-fracturing integrated pipe column may not be completed because the acid-fracturing integrated pipe column bears pressure in the well, and at the moment, the jar 7 is started, and the jar 7 is used for performing jarring to loosen the acid-fracturing integrated pipe column, so that the unsealing of the acid-fracturing integrated pipe column is completed.
Alternatively, the jar 7 may provide a 30 ton, 40 ton, 60 ton, or other value of jarring force.
The jarring device 7 provided by the embodiment of the application promotes the unsealing of the acid fracturing integrated pipe column by providing the jarring force, thereby improving the success rate of the acid fracturing integrated pipe column.
Optionally, the acid fracturing integrated pipe column provided by the embodiment of the application further comprises a safety joint, and the safety joint is sleeved outside the oil pipe. Wherein the safety joint is located above the Y241 packer 1.
In the embodiment of the application, as the situation that the Y241 packer 1 cannot be unsealed in the process of lifting the acid pressure integrated pipe column, and the acid pressure integrated pipe column is lifted out, the safety joint is disconnected, the Y241 packer 1 is separated, and the acid pressure integrated pipe column except the Y241 packer 1 is lifted out.
The safety joint provided by the embodiment of the application can be disconnected to disconnect the acid-fracturing integrated pipe column from the Y241 packer 1, so that the acid-fracturing integrated pipe column except the Y241 packer 1 can be lifted out, and the acid-fracturing integrated pipe column is prevented from blocking an oil well.
It should be noted that, the various alternative embodiments of the present application can be combined with each other to implement a new tubular string, and the present application is not limited to the combination manner.
Fig. 2 is a flow chart of an acid fracturing method provided in an embodiment of the application. The method is applied to an acid fracturing integrated tubular column, and the acid fracturing integrated tubular column comprises: the testing tool, the Y241 packer and the oil pipe are sleeved outside the oil pipe, and the testing tool comprises an RDS circulating valve and a pressure gauge supporting cylinder; referring to fig. 2, the method includes:
201. and perforating the oil well in a well killing fluid environment.
In the embodiment of the application, because the casing and the stratum are in a sealing state, when the stratum is acidified, the casing in the oil well is perforated so as to enable the oil well to be communicated with the stratum.
202. And (5) well-dredging scraping is carried out on the sleeve.
Because the interior of the sleeve comprises impurities, the sleeve is firstly scraped by the well dredging device so as to clean impurity objects in the sleeve and ensure the cleaning of the interior of the sleeve.
203. And in the well killing liquid environment, the acid-fracturing integrated tubular column is put into the casing.
204. And (3) installing a christmas tree at the oil well mouth, injecting acid liquid into the oil pipe, and discharging well killing liquid from an annular space between the oil pipe and the casing.
205. The injection amount of the acid liquor reaches the preset liquid amount, the Y241 packer is set, and an annular space which is positioned between the oil pipe and the casing and below the Y241 packer is sealed.
206. Pressure is applied to the tubing, acid in the tubing is forced from the tubing, into the annulus, from where it fractures the formation, and into the formation slots.
In the embodiment of the application, after the acid fracturing integrated tubular column is put into the casing, an annular space is formed between the oil pipe and the casing, the oil pipe also comprises an oil pipe space, and the annular space is communicated with the oil pipe space at the moment. Because the acid-pressure integrated pipe column is put into the casing under the condition of well-killing liquid, well-killing liquid can exist in the oil pipe and the annular space, acid liquid is injected into the oil pipe, the pressure in the oil pipe is gradually increased in the process of injecting the acid liquid, the pressure in the annular space is unchanged, and the acid liquid in the oil pipe can push the well-killing liquid in the annular space under the condition that the pressure in the oil pipe is larger than the pressure in the annular space, so that the well-killing liquid is discharged from the annular space, and the acid liquid is stopped being injected when the injection amount of the acid liquid reaches the preset liquid amount, and the oil pipe is filled with the acid liquid at the moment.
Optionally, in the process of extruding the acid liquor into the gaps of the stratum, the acid liquor in the oil pipe is firstly discharged into the stratum according to smaller displacement, after extruding the acid liquor with fixed liquid quantity, the stratum is fractured by increased pressure, at the moment, the gaps of the stratum can normally suck the acid liquor, the displacement is increased again, and the acid liquor in the oil pipe is completely discharged into the gaps of the stratum.
207. And opening an RDS circulating valve, communicating the oil pipe with the annular space, plugging the oil pipe below the RDS circulating valve, and collecting a liquid sample.
After the exploitation and the pressure measurement are completed, an RDS circulating valve is started, an oil pipe is communicated with the annular space, the oil pipe below the RDS circulating valve is plugged, at the moment, the RDS circulating valve can collect a liquid sample in a stratum, and after an acid pressure integrated pipe column is pulled out, the collected liquid sample in the stratum is obtained.
208. The pressure gauge bracket measures the pressure in the oil pipe and the casing pipe, and the measured pressure is uploaded to the control equipment.
209. And (5) pulling out the acid fracturing integrated tubular column.
And (3) acidizing the gaps of the stratum in the oil well is completed, testing of the stratum is completed, and the acid-fracturing integrated tubular column can be lifted out subsequently.
According to the method provided by the embodiment of the application, the annular space between the oil pipe and the casing pipe can be sealed through the Y241 packer, the acid liquor in the oil pipe is extruded into the gap of the stratum by applying pressure to the oil pipe, the acidizing treatment of the stratum is completed, the liquid sample in the stratum and the pressure of the oil pipe and the casing pipe can be collected through the testing tool, the testing of the stratum is further completed, the acid-pressure integrated pipe column is simple in structure and convenient to use, the acid pressure and the testing can be completed simultaneously, and the functions are complete.
In one possible implementation, the acid fracturing integrated tubular column further comprises a positioning nipple, and the positioning nipple is sleeved on the outer side of the oil pipe; the method further comprises the steps of: the locating nipple measures the current depth of the locating nipple.
When the acid fracturing integrated pipe column is placed, the current depth of the acid fracturing integrated pipe column can be positioned through the positioning nipple, and the acid fracturing integrated pipe column is placed at a construction position according to the depth measured by the positioning nipple so as to acidize a stratum gap at the construction position.
In another possible implementation manner, the acid-fracturing integrated tubular column further comprises an RD circulation valve, and the RD circulation valve sleeve is arranged outside the oil pipe; the method further comprises the steps of:
The RD circulation valve is opened, the oil pipe is communicated with the annular space, and the oil pipe below the RD circulation valve is plugged.
According to the RD circulation valve provided by the embodiment of the application, as the standby valve, the RD circulation valve is opened under the condition that the RDS circulation valve cannot be opened, so that the normal operation of a construction flow is ensured, the accuracy of a construction process is improved, and the safety of construction is also ensured.
In another possible implementation manner, the acid fracturing integrated tubular column further comprises a jar, wherein the jar is sleeved outside the oil pipe; the method further comprises the steps of:
The jar is used for shocking, and the acid fracturing integrated pipe column is lifted out.
According to the jarring device provided by the embodiment of the application, the jarring force is provided to promote the unsealing of the acid fracturing integrated pipe column, so that the success rate of lifting the acid fracturing integrated pipe column is improved.
The foregoing description is only for the convenience of those skilled in the art to understand the technical solution of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (2)
1. An acid fracturing integrated tubular column, characterized in that, the acid fracturing integrated tubular column includes: the device comprises a testing tool, a Y241 packer (1), a positioning nipple (4), an expansion joint (5), an oil pipe, an RD circulation valve (6), a jar (7) and a ball seat, wherein the positioning nipple (4), the expansion joint (5), the RD circulation valve (6) and the jar (7) are sleeved on the outer side of the oil pipe, the ball seat is positioned at the lower end of the Y241 packer (1), the testing tool and the Y241 packer (1) are sleeved on the outer side of the oil pipe, and the testing tool comprises an RDS circulation valve (2) and a pressure gauge bracket (3);
the positioning nipple (4) is used for measuring the current depth of the positioning nipple (4), the expansion joint (5) is used for stretching or shrinking the length of the acid-fracturing integrated tubular column, and the jar (7) is used for lifting out the acid-fracturing integrated tubular column;
perforating a sleeve in an oil well in a well killing fluid environment to enable the oil well to be communicated with a stratum, and scraping the sleeve through a well to clean impurity objects in the sleeve;
in the well killing liquid environment, the acid-fracturing integrated tubular column is placed into the sleeve, an annular space formed between the oil pipe and the sleeve is communicated with an oil pipe space in the oil pipe, and well killing liquid exists in the oil pipe space and the annular space;
during the injection of acid liquid in the tubing, the pressure in the tubing increases while the pressure in the annular space is unchanged; when the pressure in the oil pipe is greater than the pressure in the annular space, the acid liquid in the oil pipe pushes the well killing liquid in the annular space so as to drain the well killing liquid from the annular space;
When the injection amount of the acid liquor reaches a preset liquid amount, a valve ball is thrown into the oil pipe, the valve ball is sunk into the position of the ball seat, when the valve ball is in contact with the ball seat, the oil pipe is plugged, pressure is applied to the oil pipe, the Y241 packer (1) starts to execute a setting process under the action of the pressure until the Y241 packer (1) is completely set, and an annular space which is positioned between the oil pipe and the sleeve and is positioned below the Y241 packer (1) is completely sealed; continuing to increase the applied pressure, and driving off the ball seat so as to enable the valve ball and the ball seat to fall into the bottom of the well, wherein the maximum pressure bearable by the Y241 packer (1) is less than 80 megapascals;
During the application of pressure to the tubing such that the acid fluid enters the formation slots, the acid fluid in the tubing is forced by the pressure to drain from the tubing into the annular space at a first displacement such that the acid fluid contacts the formation;
Responding to the fact that the discharge amount of the acid liquor in the stratum reaches a fixed liquid amount, increasing the pressure to fracture the stratum, enabling the gaps in the stratum to suck the acid liquor normally, discharging the acid liquor in the oil pipe into the gaps according to a second discharge amount, wherein the first discharge amount is smaller than the second discharge amount, and the pressure is positively correlated with the discharge amount of the acid liquor entering in the gaps;
under the condition that the RDS circulating valve (2) can be normally opened, opening the RDS circulating valve (2), communicating the oil pipe with the annular space, and plugging the oil pipe below the RDS circulating valve (2) so that the RDS circulating valve (2) collects a liquid sample in the stratum;
Under the condition that the RDS circulating valve (2) cannot be normally opened, opening the RD circulating valve (6), communicating the oil pipe with the annular space, and plugging the oil pipe below the RD circulating valve (6), so that the RD circulating valve (6) collects a liquid sample in the stratum;
The pressure gauge bracket (3) is used for measuring the pressure in the oil pipe and the casing pipe and uploading the measured pressure to the control equipment.
2. An acid fracturing method, wherein the method is applied to an acid fracturing integrated tubular column, the acid fracturing integrated tubular column comprising: the testing tool, the Y241 packer (1), the positioning nipple (4), the telescopic joint (5), the RD circulation valve (6), the jar (7), the ball seat and the oil pipe are sleeved outside the oil pipe, the ball seat is positioned at the lower end of the Y241 packer (1), the testing tool comprises an RDS circulating valve (2) and a pressure gauge supporting cylinder (3), the positioning nipple (4) is used for measuring the current depth of the positioning nipple (4), the expansion joint (5) is used for stretching or shrinking the length of the acid-pressure integrated pipe column, and the jar (7) is used for pulling out the acid-pressure integrated pipe column;
The method comprises the following steps:
perforating a sleeve in an oil well in a well killing fluid environment to enable the oil well to be communicated with a stratum, and scraping the sleeve through a well to clean impurity objects in the sleeve;
in the well killing liquid environment, the acid-fracturing integrated tubular column is placed into the sleeve, an annular space formed between the oil pipe and the sleeve is communicated with an oil pipe space in the oil pipe, and well killing liquid exists in the oil pipe space and the annular space;
during the injection of acid liquid in the tubing, the pressure in the tubing increases while the pressure in the annular space is unchanged; when the pressure in the oil pipe is greater than the pressure in the annular space, the acid liquid in the oil pipe pushes the well killing liquid in the annular space so as to drain the well killing liquid from the annular space;
When the injection amount of the acid liquor reaches a preset liquid amount, a valve ball is thrown into the oil pipe, the valve ball is sunk into the position of the ball seat, when the valve ball is in contact with the ball seat, the oil pipe is plugged, pressure is applied to the oil pipe, the Y241 packer (1) starts to execute a setting process under the action of the pressure until the Y241 packer (1) is completely set, and an annular space which is positioned between the oil pipe and the sleeve and is positioned below the Y241 packer (1) is completely sealed; continuing to increase the applied pressure, and driving off the ball seat so as to enable the valve ball and the ball seat to fall into the bottom of the well, wherein the maximum pressure bearable by the Y241 packer (1) is less than 80 megapascals;
During the application of pressure to the tubing such that the acid fluid enters the formation slots, the acid fluid in the tubing is forced by the pressure to drain from the tubing into the annular space at a first displacement such that the acid fluid contacts the formation; responding to the fact that the discharge amount of the acid liquor in the stratum reaches a fixed liquid amount, increasing the pressure to fracture the stratum, enabling the gaps in the stratum to suck the acid liquor normally, discharging the acid liquor in the oil pipe into the gaps according to a second discharge amount, wherein the first discharge amount is smaller than the second discharge amount, and the pressure is positively correlated with the discharge amount of the acid liquor entering in the gaps;
Under the condition that the RDS circulating valve (2) can be normally opened, opening the RDS circulating valve (2), communicating the oil pipe with the annular space, and plugging the oil pipe below the RDS circulating valve, so that the RDS circulating valve (2) collects a liquid sample;
Under the condition that the RDS circulating valve (2) cannot be normally opened, opening the RD circulating valve (6), communicating the oil pipe with the annular space, and plugging the oil pipe below the RD circulating valve (6), so that the RD circulating valve (6) collects a liquid sample in the stratum;
the pressure gauge bracket (3) measures the pressure in the oil pipe and the sleeve and uploads the measured pressure to the control equipment.
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| CN207278222U (en) * | 2017-09-25 | 2018-04-27 | 中国石油天然气集团公司 | A kind of safe circulating valve of multi-functional sliding sleeve |
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| US4064937A (en) * | 1977-02-16 | 1977-12-27 | Halliburton Company | Annulus pressure operated closure valve with reverse circulation valve |
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| CN103161438B (en) * | 2011-12-15 | 2017-04-19 | 中国海洋石油总公司 | Tubular column of perforation fracturing test system |
| CN202946121U (en) * | 2012-12-17 | 2013-05-22 | 中国石油集团渤海钻探工程有限公司 | Integrated perforation, acid fracturing, pilot production and seal coat tubular column |
| CN203856456U (en) * | 2014-03-18 | 2014-10-01 | 中国海洋石油总公司 | Well testing pipe column |
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| CN207278222U (en) * | 2017-09-25 | 2018-04-27 | 中国石油天然气集团公司 | A kind of safe circulating valve of multi-functional sliding sleeve |
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