CN114607343B - 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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- CN114607343B CN114607343B CN202011407518.9A CN202011407518A CN114607343B CN 114607343 B CN114607343 B CN 114607343B CN 202011407518 A CN202011407518 A CN 202011407518A CN 114607343 B CN114607343 B CN 114607343B
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- 239000002253 acid Substances 0.000 title claims abstract description 197
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000007788 liquid Substances 0.000 claims description 75
- 210000002445 nipple Anatomy 0.000 claims description 32
- 238000012360 testing method Methods 0.000 claims description 32
- 230000009471 action Effects 0.000 claims description 17
- 230000008602 contraction Effects 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000013589 supplement Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 239000003129 oil well Substances 0.000 abstract description 17
- 239000012530 fluid Substances 0.000 abstract description 15
- 230000010354 integration Effects 0.000 abstract description 10
- 230000009466 transformation Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 16
- 238000010276 construction Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 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
- 238000007790 scraping Methods 0.000 description 1
Classifications
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
-
- 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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Sampling And Sample Adjustment (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. RTTS packer setting, inject the acidizing fluid in oil pipe, the well killing fluid is discharged from the annular space between oil pipe and the sleeve pipe, OMNI valve is closed, apply pressure to oil pipe, the acidizing fluid in the oil pipe enters into the gap in stratum, Y241 packer setting, apply pressure to oil pipe, the acidizing fluid in oil pipe receives the effect of pressure, it is in the annular space below Y241 packer to discharge from oil pipe, enter into the gap in stratum from annular space, fracturing sliding sleeve opens, apply pressure to oil pipe, the acidizing fluid in oil pipe receives the effect of pressure, discharge from oil pipe into the annular space below Y241 packer again into the gap in stratum, this acidizing pressure integration tubular column layering acidizes the stratum, the efficiency of the stratum to the oil well has been improved, the comprehensiveness of acidizing the stratum has been improved, the transformation scope to the stratum has been expanded.
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: packer, RD circulation valve (circulation valve of one type), RD safety circulation valve (circulation valve of one type), jar, pressure gauge support cylinder, hydraulic circulation valve, safety joint, telescopic joint, etc. However, the APR tool is inefficient in acidizing the formation and has a small range of acidizing the formation.
Disclosure of Invention
The embodiment of the application provides an acid fracturing integrated tubular column and an acid fracturing method, wherein the acid fracturing integrated tubular column is suitable for acidizing a stratum with large thickness, acidizing the stratum in a layered manner, the efficiency of the stratum of an oil well is improved, the comprehensiveness of acidizing the stratum is improved, and the transformation range of the stratum is expanded. The technical scheme provided by the embodiment of the application is as follows:
in one aspect, the present application provides an acid fracturing integrated tubular column, the acid fracturing integrated tubular column includes:
the testing tool, the OMNI valve, the RTTS packer (one type of valve), the fracturing sliding sleeve and the Y241 packer (one type of packer) are sleeved on the outer side of the oil pipe, and the testing 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;
the RTTS packer is set, an annular space between the oil pipe and the casing pipe and below the RTTS packer is sealed, the OMNI valve is opened, the oil pipe is communicated with the annular space, acid liquid is injected into the oil pipe, and the well killing liquid is discharged from the annular space between the oil pipe and the casing pipe;
the injection amount of the acid liquor reaches a preset liquid amount, the OMNI valve is closed, the oil pipe and the annular space are sealed, pressure is applied to the oil pipe, the acid liquor in the oil pipe is discharged into the annular space below the RTTS packer from the oil pipe under the action of the pressure, and a stratum is fractured from the annular space and enters a gap of the stratum;
the Y241 packer is set to seal an annular space between the oil pipe and the casing and below the Y241 packer;
injecting acid liquor into the oil pipe, applying pressure to the oil pipe, and discharging the acid liquor in the oil pipe from the oil pipe into the annular space below the Y241 packer under the action of the pressure, and entering gaps of the stratum from the annular space;
the fracturing sliding sleeve is opened, acid liquid is injected into the oil pipe, pressure is applied to the oil pipe, the acid liquid in the oil pipe is discharged into the annular space below the Y241 packer from the oil pipe under the action of the pressure, and the acid liquid enters into a gap of the stratum from the annular space;
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 in the stratum;
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 manner, the acid-fracturing integrated tubular column further comprises a hydraulic bypass valve, and the hydraulic bypass valve sleeve is arranged outside the oil pipe; a hydraulic bypass valve bypasses the upper portion of the RTTS packer;
the hydraulic bypass valve is used to relieve pressure located below the RTTS packer.
In another possible implementation, the acid fracturing integrated tubular string includes a first expansion joint and a second expansion joint; the first expansion joint and the second expansion joint are sleeved outside the oil pipe;
when the acid fracturing integrated pipe column expands when encountering heat, the first expansion joint and the second expansion joint stretch to supplement the stretching generated by expansion, and when the acid fracturing integrated pipe column contracts when encountering cold, the first expansion joint and the second expansion joint shorten 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;
under the condition that the RDS circulating valve cannot be opened, opening the RD circulating valve, communicating the oil pipe with the annular space, and plugging the oil pipe below the RD circulating valve;
alternatively, the RDS circulation valve is kept closed in case it is opened.
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 acid fracturing integrated tubular string further comprises a hydraulic anchor; the hydraulic anchor is positioned above the RTTS packer;
the hydraulic anchor is used for fixing the RTTS packer.
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.
In another aspect, an embodiment of the present application provides an acid fracturing method, where the method is applied to an acid fracturing integrated tubular column, and the acid fracturing integrated tubular column includes: the testing tool, the OMNI valve, the RTTS packer, the fracturing sliding sleeve, the Y241 packer and the oil pipe are sleeved on the outer side of the oil pipe; the method comprises the following steps:
in a well killing liquid environment, the acid-fracturing integrated tubular column is put into a casing;
the RTTS packer is set, an annular space between the oil pipe and the casing pipe and below the RTTS packer is sealed, the OMNI valve is opened, the oil pipe is communicated with the annular space, acid liquid is injected into the oil pipe, and the well killing liquid is discharged from the annular space between the oil pipe and the casing pipe;
the injection amount of the acid liquor reaches a preset liquid amount, the acid liquor reaches a preset position, pressure is applied to the oil pipe, the acid liquor in the oil pipe is discharged into the annular space below the RTTS packer from the oil pipe under the action of the pressure, and a stratum is fractured from the annular space and enters a gap of the stratum;
the OMNI valve is closed to seal the oil pipe and the annular space, the Y241 packer is set to seal the annular space which is positioned between the oil pipe and the casing and below the Y241 packer;
injecting acid liquor into the oil pipe, applying pressure to the oil pipe, and discharging the acid liquor in the oil pipe from the oil pipe into the annular space below the Y241 packer under the action of the pressure, and entering gaps of the stratum from the annular space;
the fracturing sliding sleeve is opened, acid liquid is injected into the oil pipe, pressure is applied to the oil pipe, the acid liquid in the oil pipe is discharged into the annular space below the Y241 packer from the oil pipe under the action of the pressure, and the acid liquid enters into a gap of the stratum from the annular space;
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 in the stratum;
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 pressure integrated pipe column further comprises a hydraulic bypass valve, the hydraulic bypass valve sleeve is arranged on the outer side of the oil pipe, and the hydraulic bypass valve is used for bypassing the upper part of the RTTS packer; the method further comprises the steps of:
and releasing the pressure positioned below the RTTS packer through the hydraulic bypass valve.
In another possible implementation manner, the acid-fracturing integrated tubular column further comprises an acid-fracturing integrated tubular column and an RD circulation valve, and the RD circulation valve sleeve is arranged outside the oil pipe; the method further comprises the steps of:
under the condition that the RDS circulating valve cannot be opened, opening the RD circulating valve, communicating the oil pipe with the annular space, and plugging the oil pipe below the RD circulating valve;
alternatively, the RDS circulation valve is kept closed in case it is opened.
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 jars to lift the acid fracturing integrated pipe column.
The beneficial effects that technical scheme that this application embodiment provided include at least:
the acid pressure integration tubular column that this embodiment provided can separate the annular space between oil pipe and the sleeve pipe through RTTS packer and Y241 packer, separate the annular space that will be located RTTS packer below through Y241 packer, inject the acidizing fluid into the stratum through spaced annular space, the layering is accomplished the transformation to the stratum, and can gather the liquid sample in the stratum and oil pipe and sheathed tube pressure through test tool, and then accomplish the test of stratum, this acid pressure integration tubular column is applicable to the acidizing to the stratum that thickness is big, the layering acidizing to the stratum, the efficiency to the stratum of oil well has been improved, the comprehensiveness to the stratum acidizing has been improved, the transformation scope to the stratum has been expanded.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that 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 in an embodiment of the present application;
fig. 2 is a flow chart of an acid fracturing method provided in an embodiment of the present 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 below with reference to the accompanying drawings.
The acid pressure integrated tubular column that this application embodiment provided, use in the oil gas exploitation field, after the well drilling is accomplished, owing to there is the gap in the stratum, in order to improve oil gas and get into the oil well through the gap, need carry out acid pressure to the gap in the stratum earlier, so that the gap enlarges, increase output, adopt the acid pressure integrated tubular column that this application embodiment provided, not only accomplish the acid pressure to the stratum of a plurality of intervals, can also gather the liquid sample and the pressure in the stratum, test the stratum, this acid pressure integrated tubular column has improved the efficiency to the stratum of oil well, and can carry out acid pressure to a plurality of stratum, the transformation scope to the stratum has been expanded.
Fig. 1 is a schematic structural diagram of an acid fracturing integrated tubular column according to an embodiment of the present application. Referring to fig. 1, the acid fracturing integrated column comprises: the testing tool comprises an RDS circulation valve 5 and a pressure gauge bracket 6, and comprises an OMNI valve 1, an RTTS packer 2, a fracturing sliding sleeve 3, a Y241 packer 4 and an oil pipe.
Wherein, testing tool, OMNI valve 1, RTTS packer 2, fracturing sliding sleeve 3 and Y241 packer 4 cover are located the oil pipe outside.
In the embodiment of the application, the testing tool is used for testing the stratum, the RTTS packer 2 and the Y241 packer 4 are used for packing the stratum, the OMNI valve 1 is used for communicating an oil pipe with an annular space, the fracturing sliding sleeve 3 is used for communicating the oil pipe with the annular space under the fracturing condition, and the oil pipe is used for injecting acid liquid into the stratum.
Before the embodiment of the application, firstly, drilling is carried out in the stratum, then, a sleeve is put into the drilled well, the well is fixed through the sleeve, then, other tubular columns are put into the sleeve, and the well is adjusted through the other tubular columns, so that oil and gas exploitation is completed.
Before an acid pressure integrated pipe column is put into the casing, the acid pressure integrated pipe column is formed after the installation is finished according to the installation sequence of an RDS circulating valve 5, a pressure gauge supporting cylinder 6, an OMNI valve 1, an RTTS packer 2, a fracturing sliding sleeve 3 and a Y241 packer 4 which are included in a testing tool, and the acid pressure integrated pipe column is put into the casing in a well control fluid environment.
Optionally, the testing tool, the OMNI valve 1, the RTTS packer 2, the fracturing sliding sleeve 3 and the Y241 packer 4 are all in threaded connection with the oil pipe, so that the testing tool and the Y241 packer 4 are sleeved outside the oil pipe.
Optionally, the acid fracturing integrated tubular column further comprises a positioning nipple 7, and the positioning nipple 7 is sleeved on the outer side of the oil pipe. For example, the locating nipple 7 is located above the test tool, or the locating nipple 7 is located between the test tool and the Y241 packer 4.
The positioning nipple 7 is used for measuring the current depth of the positioning nipple 7. In the process of placing the acid fracturing integrated pipe column, as the positioning nipple 7 is positioned on the acid fracturing integrated pipe column, after the depth is measured through the positioning nipple 7, 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 7 is measured through the positioning nipple 7, and then the acid fracturing integrated pipe column is placed into the preset position based on the depth, so that the accuracy of the placed 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 impurity objects 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-fracturing integrated tubular column is put into the casing under the condition of the well-killing liquid, the well-killing liquid exists in the oil pipe and the annular space, and the well-killing liquid in the oil pipe can be replaced by the way of injecting the acid liquid.
In the displacement process, the RTTS packer 2 is set, the annular space between the oil pipe and the casing pipe and below the RTTS packer 2 is in a style, the OMNI valve 1 is opened, the oil pipe is communicated with 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, under the condition that the pressure in the oil pipe is larger than the pressure in the annular space, the acid liquid in the oil pipe can push 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 liquid reaches a preset liquid amount, the acid liquid is stopped from being injected, at the moment, the oil pipe is filled with the acid liquid, the OMNI valve 1 is closed again, the oil pipe and the annular space are sealed, the acid liquid in the oil pipe is subjected to pressure, the pressure in the oil pipe is increased, the acid liquid in the oil pipe is discharged into the annular space below the RTTS packer 2 from the annular space under the condition that the increased pressure is subjected to fracturing of the bottom layer, and the fracturing gap of the stratum is entered into.
Optionally, the acid fracturing integrated string further comprises a hydraulic anchor 1313, the hydraulic anchor 1313 being located above the RTTS packer 2. The hydraulic anchor 1313 can fix the RTTS packer 2, and prevent the RTTS packer 2 from sliding down in the setting process, so that the annular space of the packer fails.
The Y241 packer 4 is located in an annular space which can be sealed off by the subsequent Y241 packer 4 being set so that the annular space below the Y241 packer 4 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 4, a valve ball is put into the oil pipe in the setting process of the Y241 packer 4, 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 4 receives the action of the pressure, the setting process is started to be executed until the setting of the Y241 packer 4 is completed, an annular space between the oil pipe and the 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 4 can withstand is less than 80 mpa. The Y241 packer 4 in the embodiment of the application is simple in structure and high in bearable pressure, so that the acid pressure integrated tubular column is applied to a deep oil-gas well, the situation that the pressure is too high due to too high depth and damage to an annular space cannot be sealed is prevented, and the acid pressure success rate is improved.
In this application embodiment, after the setting of Y241 packer 4, need carry out the process of squeezing into the gap in stratum with the acidizing fluid, the annular space that is located Y241 below only communicates with external through oil pipe, pour into the acidizing fluid in oil pipe this moment, exert pressure to oil pipe, then the acidizing fluid in the oil pipe receives the effect of pressure, discharge into annular space from oil pipe, the acidizing fluid contacts the stratum this moment, when pressure is big enough, fracture the stratum, the acidizing fluid can enter into the gap in stratum from annular space, and then guarantee that the acidizing fluid reacts with the gap in stratum, enlarge the gap in stratum.
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.
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.
In this embodiment of the application, it is further necessary to acidize the stratum between the RTTS packer 2 and the Y241 packer 4, open the fracturing sliding sleeve 3, communicate the annular space between the RTTS packer 2 and the Y241 packer 4 with the oil pipe through the fracturing sliding sleeve 3, inject the acid liquid into the oil pipe at this time, apply pressure to the oil pipe, the acid liquid in the oil pipe is under the action of the pressure, and is discharged from the oil pipe into the annular space below the Y241 packer 4, and enters into the gap of the stratum from the annular space.
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 6 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, an RDS circulating valve 5 is started, an oil pipe is communicated with the annular space, the oil pipe below the RDS circulating valve 5 is plugged, at the moment, the RDS circulating valve 5 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.
In the embodiment of the application, the production, pressure, liquid property, permeability and other formation parameters of the oil well can be determined through production and pressure measurement, and the production of the formation is continued according to the measured formation parameters.
Optionally, the RTTS packer is located above the Y241 packer, the annular space below the RTTS packer is sealed through the RTTS packer, and then the Y241 packer is set, so that the annular space below the RTTS packer can be divided into two parts, and the stratum between the RTTS packer and the Y241 packer and the stratum below the Y241 packer are respectively acidized, so that the stratum is modified in a layering manner, the stratum is modified in a layering manner under the condition that the stratum is thicker, the accuracy of modifying the stratum is guaranteed, and the range of modifying the stratum is improved.
In addition, the inside diameter of the casing above the RTTS packer is larger than the inside diameter of the casing below the RTTS packer, and the size of the RTTS packer is larger than the size of the T241 packer, so that the completion of the RTTS packer in the setting process of the annular space between the oil pipe and the casing is ensured.
The acid fracturing integrated tubular column of this application embodiment adopts RTTS packer and Y241 packer to set, is applicable to in deep and the great oil well of thickness, and this RTTS packer and Y241 packer can be in the degree of depth big, and realizes setting under the condition of reservoir thickness, and then guarantees acidizing the gap in stratum, has expanded the range of application of acid fracturing integrated tubular column.
The acid pressure integration tubular column that this embodiment provided can separate the annular space between oil pipe and the sleeve pipe through RTTS packer and Y241 packer, can separate the annular space that is located RTTS packer below through Y241 packer, inject the acidizing fluid into the stratum through spaced annular space, the transformation to the stratum is accomplished in the layering, and can gather the liquid sample in the stratum and oil pipe and sheathed tube pressure through test tool, and then accomplish the test of stratum, this acid pressure integration tubular column is applicable to the acidizing of stratum that thickness is big, the layering acidizes the stratum, the efficiency to the stratum of oil well has been improved, the comprehensiveness to acidizing has been improved, the transformation scope to the stratum has been expanded.
Optionally, the acid fracturing integrated tubular column provided in the embodiment of the application further includes a first expansion joint 9 and a second expansion joint 10, and the first expansion joint 9 and the second expansion joint 10 are sleeved outside the oil pipe. For example, the first telescopic joint 9 is located above the Y241 packer 4, the second telescopic joint 10 is located above the RTTS packer 2, or the first telescopic joint 9 is located above the test tool, the second telescopic joint 10 is located below the RTTS packer 2, or the first telescopic joint 9 and the second telescopic joint 10 are located at other positions.
Wherein, when the acid-fracturing integrated pipe column expands when encountering heat, the first expansion joint 9 and the second expansion joint 10 extend to supplement the stretching generated by expansion, and when the acid-fracturing integrated pipe column contracts when encountering cold, the first expansion joint 9 and the second expansion joint 10 contract to supplement the contraction generated by contraction.
For example, in the process of setting the acid fracturing string, since the environmental temperature in which the acid fracturing string is located is continuously increased as the depth in which the acid fracturing string is located is continuously increased, the acid fracturing string is expanded due to the increase in the temperature of the current environment, and the first expansion joint 9 and the second expansion joint 10 can be extended to compensate for the tension generated 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 first telescopic joint 9 and the second telescopic joint 10 can shrink to replace the shrinkage caused by the shrinkage.
The telescopic joint provided by the embodiment of the application can ensure that the acid pressure integrated pipe column is replaced by the extension or contraction generated due to temperature change in the process of entering or exiting, so that the acid pressure integrated pipe column is prevented from being damaged due to expansion or contraction, the safety of the acid pressure integrated pipe column in the construction process is improved, and the success rate of the acid pressure integrated pipe column in the construction process is also improved.
Optionally, the acid pressure integrated pipe column further comprises a hydraulic bypass valve 8, and the hydraulic bypass valve 8 is sleeved outside the oil pipe. Wherein the hydraulic bypass valve 8 is located above the RTTS packer 2.
The hydraulic bypass valve 8, when opened, can release the pressure at the lower layer of the RTTS packer 2.
Optionally, the acid fracturing integrated tubular column provided in the embodiment of the present application further includes an RD circulation valve 11, and the RD circulation valve 11 is sleeved on the outer side of the oil pipe. Wherein the RD circulation valve 11 is located below the test tool, or the RD circulation valve 11 is located above the test tool, or the RD circulation valve 11 is located elsewhere.
In this embodiment, the RD circulation valve 11 is a backup valve, and when the RDs circulation valve 5 cannot be opened, the RD circulation valve 11 is opened, so that the RD circulation valve 11 replaces the RDs circulation valve 5, and the oil pipe is communicated with the annular space, so that the oil pipe below the RD circulation valve 11 is plugged. While in case RDS circulation valve 5 can be opened normally RD circulation valve 11 is kept closed.
The RDs circulation valve 11 can also be replaced by an RDs circulation valve 5, and the embodiment of the present application is not limited.
The RD circulation valve 11 that this application embodiment provided is as the reserve valve, and under the condition that RDS circulation valve 5 can't open, opens RD circulation valve 11 to guarantee the normal operating of work flow, improved the accuracy of work progress, and also guaranteed the security of construction.
Optionally, the acid fracturing integrated pipe string in the embodiment of the present application further comprises a jar 12, wherein the jar 12 is sleeved outside the oil pipe. Wherein the jar 12 is located above the Y241 packer 4, or the jar 12 is located above the testing tool, or the jar 12 is located elsewhere.
In this embodiment of the application, if after the construction is completed through this acid fracturing integrated tubular column, this acid fracturing integrated tubular column needs to be unsealed subsequently, and then the acid fracturing integrated tubular column is lifted out of the oil well, and because the acid fracturing integrated tubular column bears pressure in the well, the unsealing of the acid fracturing integrated tubular column may not be completed, at this time, the jar 12 is started, and the jar 12 is used for performing a jar, so that the acid fracturing integrated tubular column is loosened, and then the unsealing of the acid fracturing integrated tubular column is completed.
Alternatively, the jar 12 may provide a 30 ton, 40 ton, 60 ton, or other value of jarring force.
The jar 12 provided by the embodiments of the present application, through providing a jarring force to facilitate the unsealing of an acid fracturing integrated string, further improves the success rate of the acid fracturing integrated string.
Optionally, the acid fracturing integrated tubular column provided by the embodiment of the application further comprises a first safety joint, a second safety joint and a third safety joint, and the first safety joint, the second safety joint and the third safety joint are sleeved outside the oil pipe. Wherein, this first safety joint is located the test tool top, and the second safety joint is located RTTS top, and the third safety joint is located Y241 packer 4 top.
In the embodiment of the application, because the acid fracturing integrated pipe column can possibly appear in the process of lifting up the RTTS packer 2 and the Y241 packer 4, and then the condition of lifting up the acid fracturing integrated pipe column, the third safety joint is disconnected, and then the Y241 packer 4 is separated, the acid fracturing integrated pipe column except for the Y241 packer 4 is lifted up, if the pipe column still cannot be lifted up, the second safety joint is disconnected, the acid fracturing integrated pipe column except for the RTTS packer 2 is lifted up, if the pipe column still cannot be lifted up, the first safety joint is disconnected, the acid fracturing integrated pipe column except for a test tool is lifted up,
the safety joint that this application embodiment provided can break off, abandons the unable part that plays out in the acid fracturing integration tubular column, and then can play out other parts in the acid fracturing integration tubular column, prevents that acid fracturing integration tubular column from blockking up the oil well.
It should be noted that, the various alternative embodiments in the present application can be combined with each other to implement a new pipe 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 present application. The method is applied to an acid fracturing integrated tubular column, and the acid fracturing integrated tubular column comprises: the testing tool, the OMNI valve, the RTTS packer, the fracturing sliding sleeve, the Y241 packer and the oil pipe are sleeved outside the oil pipe; the method comprises the following steps:
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 sealed state, when the stratum is acidified, the casing in the oil well is perforated first, so that the oil well is 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) setting the RTTS packer, sealing an annular space between the oil pipe and the casing and below the RTTS packer, opening an OMNI valve, communicating the oil pipe with the annular space, injecting acid liquid into the oil pipe, and discharging well killing liquid from the annular space between the oil pipe and the casing.
205. The injection amount of the acid liquor reaches a preset liquid amount, the acid liquor reaches a preset position, pressure is applied to the oil pipe, the acid liquor in the oil pipe is discharged into an annular space below the RTTS packer from the oil pipe under the action of the pressure, and the stratum is fractured from the annular space and enters into a gap of the stratum.
206. The OMNI valve is closed, sealing the tubing from the annulus, and the Y241 packer is set, sealing the annulus between the tubing and casing below the packer.
207. Acid liquid is injected into the oil pipe, pressure is applied to the oil pipe, the acid liquid in the oil pipe is discharged into an annular space below the Y241 packer from the oil pipe under the action of the pressure, and the acid liquid enters into a gap of a stratum from the annular space.
208. The fracturing sliding sleeve is opened, acid liquid is injected into the oil pipe, pressure is applied to the oil pipe, the acid liquid in the oil pipe is discharged into an annular space below the Y241 packer from the oil pipe under the action of the pressure, and the acid liquid enters into a gap of a stratum from the annular space.
209. 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 in the stratum.
210. 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.
211. 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 RTTS packer and the Y241 packer, the annular space below the RTTS packer can be separated through the Y241 packer, acid liquid is injected into the stratum through the separated annular space, transformation of the stratum is completed in a layered mode, a liquid sample in the stratum and the pressure of the oil pipe and the casing pipe can be collected through a testing tool, then the testing of the stratum is completed, the acid-pressure integrated pipe column is suitable for acidizing the stratum with large thickness, acidizing is conducted on the stratum in a layered mode, efficiency of the stratum of an oil well is improved, the comprehensiveness of acidizing the stratum is improved, and the transformation range of the stratum is expanded.
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 pressure integrated pipe column further comprises an acid pressure integrated pipe column and a hydraulic bypass valve, wherein the hydraulic bypass valve is arranged on the outer side of the oil pipe, and the hydraulic bypass valve is an upper bypass of the RTTS packer; the method further comprises the steps of: the pressure at the lower layer of the RTTS packer is released through a hydraulic bypass valve.
In another possible implementation manner, the acid fracturing integrated pipe column further comprises an acid fracturing integrated pipe column and an RD circulation valve, and the RD circulation valve sleeve is arranged on the outer side of the oil pipe; the method further comprises the steps of:
under the condition that the RDS circulating valve cannot be opened, opening the RDS circulating valve, communicating the oil pipe with the annular space, and plugging the oil pipe below the RDS circulating valve;
alternatively, in the case where the RDS circulation valve is open, the RD circulation valve is kept closed.
The RD circulation valve that this application embodiment provided is as the reserve valve, and under the unable condition of opening of RDS circulation valve, open the RD circulation valve to guarantee the normal operating of work flow, improved the accuracy of work progress, and also guaranteed the security of construction.
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 jars to lift the acid fracturing integrated pipe column.
The jar that this application embodiment provided is through providing jarring power in order to promote acid fracturing integration tubular column deblocking, and then improves the success rate of producing acid fracturing integration tubular column.
The foregoing is merely for facilitating understanding of the technical solutions of the present application by those skilled in the art, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (14)
1. An acid fracturing integrated tubular column, characterized in that, the acid fracturing integrated tubular column includes:
the testing tool, the OMNI valve (1), the RTTS packer (2), the fracturing sliding sleeve (3), the Y241 packer (4) and the oil pipe are sleeved on the outer side of the oil pipe, and the testing tool comprises an RDS circulating valve (5) and a pressure gauge supporting cylinder (6);
in a well killing liquid environment, the acid-fracturing integrated tubular column is put into a casing;
the RTTS packer (2) is used for setting, an annular space between the oil pipe and the casing pipe and below the RTTS packer (2) is sealed, the OMNI valve (1) is opened, the oil pipe is communicated with the annular space, acid liquid is injected into the oil pipe, and the well killing liquid is discharged from the annular space between the oil pipe and the casing pipe;
the injection amount of the acid liquor reaches a preset liquid amount, the OMNI valve (1) is closed, the oil pipe and the annular space are sealed, pressure is applied to the oil pipe, the acid liquor in the oil pipe is discharged from the oil pipe into the annular space below the RTTS packer (2) under the action of the pressure, and a stratum is fractured from the annular space and enters a gap of the stratum;
the Y241 packer (4) is set, and an annular space which is positioned between the oil pipe and the casing and is positioned below the Y241 packer (4) is sealed;
injecting acid liquid into the oil pipe, applying pressure to the oil pipe, and discharging the acid liquid in the oil pipe from the oil pipe into the annular space below the Y241 packer (4) under the action of the pressure, and entering a gap of the stratum from the annular space;
the fracturing sliding sleeve (3) is opened, acid liquid is injected into the oil pipe, pressure is applied to the oil pipe, the acid liquid in the oil pipe is discharged into the annular space below the Y241 packer (4) from the oil pipe under the action of the pressure, and the acid liquid enters into a gap of the stratum from the annular space;
opening the RDS circulating valve (5), communicating the oil pipe with the annular space, plugging the oil pipe below the RDS circulating valve (5), and collecting a liquid sample in the stratum;
the pressure gauge bracket (6) is used for measuring the pressure in the oil pipe and the casing pipe and uploading the measured pressure to a control device.
2. The acid fracturing integrated tubular column according to claim 1, further comprising a positioning nipple (7), wherein the positioning nipple (7) is sleeved outside the oil pipe;
the locating nipple (7) is used for measuring the current depth of the locating nipple (7).
3. The acid fracturing integrated tubular column according to claim 1, further comprising a hydraulic bypass valve (8), wherein the hydraulic bypass valve (8) is sleeved outside the oil pipe; a hydraulic bypass valve (8) bypasses the upper part of the RTTS packer (2);
the hydraulic bypass valve (8) is used for releasing the pressure below the RTTS packer (2).
4. The acid fracturing integrated tubular string according to claim 1, characterized in that it comprises a first telescopic joint (9) and a second telescopic joint (10); the first expansion joint (9) and the second expansion joint (10) are sleeved on the outer side of the oil pipe;
when the acid fracturing integrated pipe column expands when encountering heat, the first expansion joint (9) and the second expansion joint (10) stretch to supplement the stretching generated by expansion, and when the acid fracturing integrated pipe column contracts when encountering cold, the first expansion joint (9) and the second expansion joint (10) shorten to supplement the contraction generated by contraction.
5. The acid fracturing integrated tubular column according to claim 1, further comprising an RD circulation valve (11), wherein the RD circulation valve (11) is sleeved outside the oil pipe;
when the RDS circulating valve (5) cannot be opened, opening the RD circulating valve (11), communicating the oil pipe with the annular space, and plugging the oil pipe below the RD circulating valve (11);
alternatively, the RDS circulation valve (11) is kept closed in case the RDS circulation valve (5) is opened.
6. The acid fracturing integrated tubular string according to claim 1, characterized in that it further comprises a jar (12), said jar (12) being sleeved outside said oil pipe;
the jar (12) jars and lifts out the acid fracturing integrated pipe column.
7. The acid fracturing integrated string according to claim 1, characterized in that it further comprises a hydraulic anchor (13); -the hydraulic anchor (13) is located above the RTTS packer (2);
the hydraulic anchor (13) is used for fixing the RTTS packer (2).
8. An acid fracturing integrated tubular string according to any of claims 1-7, characterized in that the maximum pressure that said Y241 packer (4) can withstand is less than 80 mpa.
9. The acid fracturing integrated tubular string according to claim 1, characterized in that it further comprises a ball seat located at the lower end of the Y241 packer (4);
and when the ball seat is contacted with the valve ball, the oil pipe is plugged.
10. 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 OMNI valve, the RTTS packer, the fracturing sliding sleeve, the Y241 packer and the oil pipe are sleeved on the outer side of the oil pipe, and the testing tool comprises an RDS circulating valve and a pressure gauge supporting cylinder; the method comprises the following steps:
in a well killing liquid environment, the acid-fracturing integrated tubular column is put into a casing;
the RTTS packer is set, an annular space between the oil pipe and the casing pipe and below the RTTS packer is sealed, the OMNI valve is opened, the oil pipe is communicated with the annular space, acid liquid is injected into the oil pipe, and the well killing liquid is discharged from the annular space between the oil pipe and the casing pipe;
the injection amount of the acid liquor reaches a preset liquid amount, the acid liquor reaches a preset position, pressure is applied to the oil pipe, the acid liquor in the oil pipe is discharged into the annular space below the RTTS packer from the oil pipe under the action of the pressure, and a stratum is fractured from the annular space and enters a gap of the stratum;
the OMNI valve is closed to seal the oil pipe and the annular space, the Y241 packer is set to seal the annular space which is positioned between the oil pipe and the casing and below the Y241 packer;
injecting acid liquor into the oil pipe, applying pressure to the oil pipe, and discharging the acid liquor in the oil pipe from the oil pipe into the annular space below the Y241 packer under the action of the pressure, and entering gaps of the stratum from the annular space;
the fracturing sliding sleeve is opened, acid liquid is injected into the oil pipe, pressure is applied to the oil pipe, the acid liquid in the oil pipe is discharged into the annular space below the Y241 packer from the oil pipe under the action of the pressure, and the acid liquid enters into a gap of the stratum from the annular space;
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 in the stratum;
the pressure gauge bracket measures the pressure in the oil pipe and the sleeve pipe and uploads the measured pressure to the control equipment.
11. The method of claim 10, wherein the acid fracturing integrated tubular string further comprises a locating nipple, the locating nipple being sleeved outside the tubing; the method further comprises the steps of:
and the locating nipple measures the current depth of the locating nipple.
12. The method of claim 10, wherein the acid fracturing integrated string further comprises a hydraulic bypass valve, the hydraulic bypass valve being disposed outside the tubing, the hydraulic bypass valve bypassing an upper portion of the RTTS packer; the method further comprises the steps of:
and releasing the pressure positioned below the RTTS packer through the hydraulic bypass valve.
13. The method of claim 10, wherein the acid fracturing integrated string further comprises an RD circulation valve, the RD circulation valve sleeve being disposed outside of the tubing; the method further comprises the steps of:
under the condition that the RDS circulating valve cannot be opened, opening the RD circulating valve, communicating the oil pipe with the annular space, and plugging the oil pipe below the RD circulating valve;
alternatively, the RDS circulation valve is kept closed in case it is opened.
14. The method of claim 10, wherein the acid fracturing integrated string further comprises a jar, the jar being sleeved outside the tubing; the method further comprises the steps of:
the jar jars to lift the acid fracturing integrated pipe column.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011407518.9A CN114607343B (en) | 2020-12-03 | 2020-12-03 | Acid fracturing integrated tubular column and acid fracturing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011407518.9A CN114607343B (en) | 2020-12-03 | 2020-12-03 | Acid fracturing integrated tubular column and acid fracturing method |
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| CN114607343A CN114607343A (en) | 2022-06-10 |
| CN114607343B true CN114607343B (en) | 2024-03-26 |
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| CN117868803A (en) * | 2024-03-13 | 2024-04-12 | 中石化西南石油工程有限公司 | Four-combined test pipe column suitable for ultra-deep well oil and gas well and use method thereof |
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| SU1677281A1 (en) * | 1989-09-19 | 1991-09-15 | Ивано-Франковский Институт Нефти И Газа | Device for developing and operating wells |
| CN102268972A (en) * | 2011-08-04 | 2011-12-07 | 荆州市翔龙石油科技有限公司 | Method for preventing setting failure of packer resulted from creeping of pipe string |
| CN205532521U (en) * | 2016-02-01 | 2016-08-31 | 中国石油天然气股份有限公司 | Ally oneself with and make tubular column |
| CN107916918A (en) * | 2017-11-16 | 2018-04-17 | 中国石油集团川庆钻探工程有限公司 | Reservoir separate zone stimulation tool tubular column and fracture acidizing method |
| CN110778288A (en) * | 2019-11-28 | 2020-02-11 | 中国石油集团川庆钻探工程有限公司 | Integrated downhole operation tool based on bidirectional slip recoverable hydraulic packer |
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2020
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|---|---|---|---|---|
| SU1677281A1 (en) * | 1989-09-19 | 1991-09-15 | Ивано-Франковский Институт Нефти И Газа | Device for developing and operating wells |
| CN102268972A (en) * | 2011-08-04 | 2011-12-07 | 荆州市翔龙石油科技有限公司 | Method for preventing setting failure of packer resulted from creeping of pipe string |
| CN205532521U (en) * | 2016-02-01 | 2016-08-31 | 中国石油天然气股份有限公司 | Ally oneself with and make tubular column |
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