CN107989590B - Staged fracturing crack expansion control device and method - Google Patents
Staged fracturing crack expansion control device and method Download PDFInfo
- Publication number
- CN107989590B CN107989590B CN201711437518.1A CN201711437518A CN107989590B CN 107989590 B CN107989590 B CN 107989590B CN 201711437518 A CN201711437518 A CN 201711437518A CN 107989590 B CN107989590 B CN 107989590B
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- Prior art keywords
- electromagnetic coil
- fixed joint
- fracturing
- hydraulic jet
- electric wire
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims abstract description 4
- 230000005291 magnetic effect Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 9
- 230000033001 locomotion Effects 0.000 abstract description 7
- 239000003129 oil well Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- BCKXLBQYZLBQEK-KVVVOXFISA-M Sodium oleate Chemical compound [Na+].CCCCCCCC\C=C/CCCCCCCC([O-])=O BCKXLBQYZLBQEK-KVVVOXFISA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000026058 directional locomotion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000005298 paramagnetic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003075 superhydrophobic effect Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The staged fracturing crack expansion control device and method comprises the steps that a hydraulic jet fracturing string is connected to the lower part of a continuous oil pipe, a fixed joint is connected to the lower part of the hydraulic jet fracturing string, an electric rotating mechanism is arranged in a cavity in the fixed joint, and the lower end of the fixed joint is radially clamped with an electromagnetic coil; spiral lifting type winding and fixing an electric wire tube on the inner wall of the continuous oil pipe and the inner wall of the hydraulic jet fracturing pipe column, and enabling the electric wire tube to linearly pass through the connector and the fixing joint; one of the electromagnetic coils is connected with the electric rotating mechanism in a one-way, and the other electromagnetic coil is wound on the iron core in a loop form; under the mutual cooperation of the coiled tubing, the electric wire, the fixed joint and the electromagnetic coil, the direction and the intensity of an electromagnetic field generated by the electromagnetic coil are controlled in real time by adjusting the ground direct current transmission intensity and the direction and the placement angle of the underground electromagnetic coil, the directional or steering movement of the fracturing fluid with superparamagnetism is guided, and the trend and the height of cracks are controlled manually.
Description
Technical Field
The invention relates to the technical field of oil well fracturing, in particular to a staged fracturing crack expansion control device and method.
Background
Along with the rapid development and application of the nano material, the sodium oleate wraps Fe 3 O 4 The nano particles have the characteristics of super-hydrophobic and superparamagnetism on the surfaces, and have been successfully applied to field experiments for improving the recovery ratio of oil wells. Also, the characteristics can be expanded to adopting a thickening agent to wrap Fe 3 O 4 The gel fracturing fluid is prepared by the nano particles, so that the fracturing fluid has super paramagnetic property, can perform directional or steering movement under the action of a magnetic field, and can artificially control crack expansion. Returning to the current situation of domestic staged fracturing operation, the extending direction and the height of the fracturing cracks mainly depend on natural conditions such as stratum stress, microcrack development, weak stratum and vertical stress of overlying stratum, and the like, and the manual intervention is difficult, so that the following defects are easy to generate in the fracturing process:
1. fracturing the string, the fracture height is too large, the effective fracture volume in the reservoir is reduced, and even the water layer is streamed, so that the oil well is flooded.
2. The crack morphology is difficult to control artificially, and the effective reconstruction volume of a thin reservoir and an ultrathin reservoir is small.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a staged fracturing crack extension control device and method, which are used for guiding the directional or steering movement of a fracturing fluid with superparamagnetism and manually controlling the trend and the height of a crack by adjusting the ground direct current transmission intensity and direction and the placement angle of an underground electromagnetic coil to control the direction and the intensity of an electromagnetic field generated by the electromagnetic coil in real time under the mutual coordination of a continuous oil pipe, an electric wire, a fixed joint and the electromagnetic coil.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the staged fracturing crack extension control device comprises a coiled tubing 1, wherein the coiled tubing 1 is connected with a hydraulic jet fracturing string 3 through a connector 2, the hydraulic jet fracturing string 3 is connected with a fixed joint 4 in a threaded mode, an electric rotating mechanism 5 is arranged in a cavity in the fixed joint 4, and the lower end of the fixed joint 4 is radially clamped with an electromagnetic coil 6; spiral lifting type winding and fixing an electric wire tube 7 on the inner wall of the continuous oil tube 1 and the inner wall of the hydraulic jet fracturing string 3, wherein the electric wire tube 7 linearly passes through the connector 2 and the fixed joint 4; the electric wire tube 7 is internally wrapped with two independent wires, one of which is connected with the electric rotating mechanism 5 in a unidirectional way, and the other is wound on the iron core in a loop way to form the electromagnetic coil 6.
A staged fracturing fracture propagation control method comprises the following steps:
firstly, according to a pre-design scheme of crack trend, firstly, setting a rotation angle of an electromagnetic coil 6 in a direction perpendicular to a working plane by controlling an electric rotation mechanism 5 through a computer on the ground to be set to be 0 degree, 30 degrees, 60 degrees, 90 degrees and 120 degrees upwards or downwards; secondly, determining the direct current transmission direction by a right-hand spiral rule;
step two, determining the space sweep range and intensity of the electromagnetic field under different current intensities according to a space magnetic field intensity distribution calculation formula near the electrified coil, and then limiting the maximum value of the current intensity according to the reservoir thickness;
and thirdly, after the direct current intensity range, the direct current direction and the electromagnetic coil rotation angle are determined, the trend and the height of the fracturing fracture can be controlled from the ground in real time, and the effective reconstruction volume of the reservoir is increased.
The invention has the following advantages: the direction and intensity of an electromagnetic field generated by the electromagnetic coil are controlled in real time by adjusting the ground direct current transmission intensity and direction and the placement angle of the underground electromagnetic coil from the ground, and the directional or steering movement of the fracturing fluid with superparamagnetism is guided, so that the extending direction and the height of cracks are controlled, a reservoir is effectively transformed, and the oil gas productivity is improved. The invention is blank in the field of oil and gas well production, can artificially control the crack morphology after application, effectively reforms the reservoir, and has considerable economic and social benefits.
Drawings
FIG. 1 shows the electromagnetic field generated in the formation after the electromagnetic coil is energized during fracturing, and FIG. 1 (a) is rotated 30 DEG upward perpendicular to the working plane; fig. 1 (b) is rotated 90 ° upward from the vertical working plane.
FIG. 2 illustrates the directional or steering motion of a superparamagnetic fracturing fluid in an artificial fracture under the influence of an electromagnetic field.
Fig. 3 is a schematic view of the shape of the fixed joint. Fig. 3 (a) is a front view of the fixed joint, fig. 3 (b) is a top view of the fixed joint, and fig. 3 (c) is a left side view of the fixed joint.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, an staged fracturing crack extension control device comprises a coiled tubing 1, wherein the coiled tubing 1 is connected with a hydraulic jet fracturing string 3 through a connector 2, the hydraulic jet fracturing string 3 is connected with a fixed joint 4 in a threaded mode, and referring to fig. 3, an electric rotating mechanism 5 is arranged in a cavity in the fixed joint 4, and the lower end of the fixed joint 4 is radially clamped with an electromagnetic coil 6; spiral lifting type winding and fixing an electric wire tube 7 on the inner wall of the continuous oil tube 1 and the inner wall of the hydraulic jet fracturing string 3, wherein the electric wire tube 7 linearly passes through the connector 2 and the fixed joint 4; the electric wire tube 7 is internally wrapped with two independent wires, one of which is connected with the electric rotating mechanism 5 in a unidirectional way, and the other is wound on the iron core in a loop way to form the electromagnetic coil 6.
The hydraulic jet fracturing string 3 is used for perforation and fracturing operation.
And the fixed joint 4 is used for fixing an electromagnetic coil at the end head of the hydraulic jet fracturing string.
The electric rotating mechanism 5 is composed of a motor, a network control circuit, a speed reducer and a bearing, and can be used for controlling the electromagnetic coil to be capable of rotating upwards or downwards by 120 degrees respectively in the direction perpendicular to a working plane (the plane where the electromagnetic coil is consistent with the axial direction of the fixed joint) by referring to the prior mature technology.
The electromagnetic coil 6 is used for generating an electromagnetic field (the direction of the electromagnetic field is judged according to the right-hand screw rule) in an oil layer around the shaft, controlling and guiding the directional or steering movement of the fracturing fluid with superparamagnetism, and achieving the purpose of manually controlling the trend and the height of the fracture.
The electric wire tube 7 is used for protecting and fixing the electric wire, transmitting alternating current into the electric rotating mechanism 5, controlling the rotating angle of the electromagnetic coil through a computer, and transmitting direct current into the electromagnetic coil 6 to generate an electromagnetic field with stable and continuous strength.
Example 1
A staged fracturing fracture propagation control method comprises the following steps:
firstly, according to a pre-design scheme of crack trend, firstly, setting a rotation angle of an electromagnetic coil 6 in a direction perpendicular to a working plane by controlling an electric rotation mechanism 5 through a computer on the ground to be set to be 0 degree, 30 degrees, 60 degrees, 90 degrees and 120 degrees upwards or downwards; secondly, determining the direct current transmission direction by a right-hand spiral rule;
simulating the space distribution conditions of the electromagnetic field intensity values under different current sizes according to the distribution and simulation calculation of the space magnetic field intensity values near the electrified circular coil (see published articles of distribution and simulation of the space magnetic field intensity values near the electrified circular coil, wang Zhixuan and the like), and then reversely selecting the maximum value of the current intensity according to the reservoir thickness to ensure that the electromagnetic field intensity is enough to control the superparamagnetic liquid to move in a reservoir range with a certain height;
step three, after the direct current intensity range, direction and electromagnetic coil rotation angle are determined, referring to fig. 2, the superparamagnetic fracturing fluid generates directional motion of N pole towards S pole under the control of electromagnetic field generated around the electrified coil, so that the height and direction of crack extension are affected, and therefore the superparamagnetic fracturing fluid is guided to generate steering motion by changing the magnetic field spatial intensity distribution and direction after the current intensity, the electrified direction and the electromagnetic coil rotation angle are adjusted on the ground in real time, the purposes of controlling the fracture trend and the height can be achieved, and the effective reconstruction volume of a reservoir is increased.
Claims (1)
1. The staged fracturing crack extension control method is characterized in that the control device comprises a continuous oil pipe (1), the continuous oil pipe (1) is connected with a hydraulic jet fracturing string (3) through a connector (2), the hydraulic jet fracturing string (3) is connected with a fixed joint (4) in a threaded mode, an electric rotating mechanism (5) is arranged in a cavity in the fixed joint (4), and the lower end of the fixed joint (4) is radially clamped with an electromagnetic coil (6); spiral lifting type winding and fixing electric wire pipes (7) are arranged on the inner walls of the continuous oil pipe (1) and the hydraulic jet fracturing pipe column (3), and the electric wire pipes (7) linearly penetrate through the connector (2) and the fixed joint (4); two independent wires are wrapped in the wire tube (7), one wire is connected with the electric rotating mechanism (5) in a unidirectional way, and the other wire is wound on the iron core in a loop form to form the electromagnetic coil (6); the control method comprises the following steps:
firstly, according to a pre-design scheme of crack trend, setting a rotation angle of an electromagnetic coil (6) in a direction perpendicular to a working plane by controlling an electric rotation mechanism (5) through a computer on the ground, wherein the rotation angle is set to be 0 DEG, 30 DEG, 60 DEG, 90 DEG and 120 DEG upwards or downwards; secondly, determining the direct current transmission direction by a right-hand spiral rule;
step two, determining the space sweep range and intensity of the electromagnetic field under different current intensities according to a space magnetic field intensity distribution calculation formula near the electrified coil, and then limiting the maximum value of the current intensity according to the reservoir thickness;
and thirdly, after the direct current intensity range, the direct current direction and the electromagnetic coil rotation angle are determined, the trend and the height of the fracturing fracture can be controlled from the ground in real time, and the effective reconstruction volume of the reservoir is increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711437518.1A CN107989590B (en) | 2017-12-26 | 2017-12-26 | Staged fracturing crack expansion control device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711437518.1A CN107989590B (en) | 2017-12-26 | 2017-12-26 | Staged fracturing crack expansion control device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107989590A CN107989590A (en) | 2018-05-04 |
| CN107989590B true CN107989590B (en) | 2024-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711437518.1A Active CN107989590B (en) | 2017-12-26 | 2017-12-26 | Staged fracturing crack expansion control device and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5582248A (en) * | 1995-06-02 | 1996-12-10 | Wedge Wireline, Inc. | Reversal-resistant apparatus for tool orientation in a borehole |
| CN103233720A (en) * | 2013-04-26 | 2013-08-07 | 中国石油大学(华东) | System and method for monitoring hydraulic fractures based on magnetic support agents |
| RU2538009C1 (en) * | 2013-10-29 | 2015-01-10 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Hydraulic fracturing method |
| CA2966497A1 (en) * | 2014-12-31 | 2016-07-07 | Halliburton Energy Services, Inc. | Magnetic sensor rotation and orientation about drill |
| CN207647497U (en) * | 2017-12-26 | 2018-07-24 | 西安石油大学 | A kind of staged fracturing crack extension control device |
-
2017
- 2017-12-26 CN CN201711437518.1A patent/CN107989590B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5582248A (en) * | 1995-06-02 | 1996-12-10 | Wedge Wireline, Inc. | Reversal-resistant apparatus for tool orientation in a borehole |
| CN103233720A (en) * | 2013-04-26 | 2013-08-07 | 中国石油大学(华东) | System and method for monitoring hydraulic fractures based on magnetic support agents |
| RU2538009C1 (en) * | 2013-10-29 | 2015-01-10 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Hydraulic fracturing method |
| CA2966497A1 (en) * | 2014-12-31 | 2016-07-07 | Halliburton Energy Services, Inc. | Magnetic sensor rotation and orientation about drill |
| CN207647497U (en) * | 2017-12-26 | 2018-07-24 | 西安石油大学 | A kind of staged fracturing crack extension control device |
Non-Patent Citations (1)
| Title |
|---|
| 基于旋转电动势控制的感应电动机转子磁场定向控制;孟明;许镇琳;;电工电能新技术(第02期) * |
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| Publication number | Publication date |
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| CN107989590A (en) | 2018-05-04 |
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