CN111485862A - Three kinds of oil reservoir chemical flooding low-injection-quantity high-throttling low-loss layered injection device - Google Patents
Three kinds of oil reservoir chemical flooding low-injection-quantity high-throttling low-loss layered injection device Download PDFInfo
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- CN111485862A CN111485862A CN201911315437.3A CN201911315437A CN111485862A CN 111485862 A CN111485862 A CN 111485862A CN 201911315437 A CN201911315437 A CN 201911315437A CN 111485862 A CN111485862 A CN 111485862A
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- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Abstract
The invention relates to the field of tertiary oil recovery in oil fields, and belongs to a low-injection high-throttling low-loss layered injection device for chemical flooding of three types of oil layers. The problems that an existing multi-medium eccentric separate injection device cannot establish effective throttling pressure difference under a low flow condition and cannot meet three-type oil layer layered flow adjustment are solved. The device consists of a double-eccentric-hole eccentric separate injection device (10), an inward-flow pressure regulating blanking plug (30) and an outward-flow pressure regulating blanking plug (60); the eccentric separate injection device (10) with the double eccentric holes is composed of an upper joint (1), an O-shaped sealing ring (2), an upper connecting sleeve (3), a centralizing body (4), a main body (5) with the double eccentric holes, a guide body (6), a conversion joint (7), a bolt (8) and a lower joint (9).
Description
Technical Field
The invention relates to the field of tertiary oil recovery in oil fields, and belongs to a low-injection high-throttling low-loss layered injection device for chemical flooding of three types of oil layers.
Background
Along with the continuous deepening of Daqing oil field development, a development object is gradually changed from a first oil layer and a second oil layer to a third oil layer, different chemical flooding layered injection devices and polymer multilayer injection downhole flow control devices are developed for the first oil layer and the second oil layer, the patent number is Z L00102551.1, the polymer multilayer injection is realized for the first time, and the single-layer injection amount of the first oil layer suitable for the Daqing oil field is 70-150m3Polymer driving multilayer injection in/d range, multi-medium eccentric injection device, patent number Z L201020673891.4, mainly solving the problem that the single-layer injection quantity of the chemical driving of the second-class oil layer is 20-70m3Multilayer dispensing in the range of/d. Due to low permeability and thin thickness of three types of oil layers, the single-layer injection amount is generally 5-20m3And d, the originally formed chemical flooding separate injection process technology cannot establish throttling pressure difference under the condition of low injection quantity, and cannot meet the requirement of layered flow adjustment of three types of oil layers.
Disclosure of Invention
The invention aims to solve the problems that the existing multi-medium eccentric separate injection device cannot establish effective throttling pressure difference under the condition of low flow and cannot meet the regulation of three-type oil layer layered flow, and the invention provides a three-type oil layer chemical-flooding layered injection device with low injection quantity, high throttling and low loss.
The technical scheme of the invention is as follows: a three-kind oil reservoir chemical flooding low-injection-quantity high-throttling low-damage layered injection device consists of a double-eccentric-hole separated injection device, an inward-flow pressure regulating plug and an outward-flow pressure regulating plug;
the eccentric double-eccentric-hole separate injection device consists of an upper joint, an O-shaped sealing ring, an upper connecting sleeve, a righting body, a main double-eccentric-hole body, a guide body, a conversion joint, a bolt and a lower joint, wherein the upper joint is in threaded connection with the upper end of the upper connecting sleeve and is sealed through the O-shaped sealing ring, the lower end of the upper connecting sleeve is in threaded connection with the upper end of the main double-eccentric-hole body and is sealed through the O-shaped sealing ring, a liquid inlet is formed in the inner wall of the main double-eccentric-hole body, a liquid outlet is formed in the side wall of the main double-eccentric-hole body, the lower end of the conversion joint is in threaded connection with the lower joint, the lower end of the righting body is fixedly connected with the main double-eccentric-hole body through the bolt, the guide body is arranged in the conversion joint, and the lower end of the guide body is fixedly connected with the conversion joint through the bolt.
The inward-flow pressure regulating blanking plug consists of a fishing rod, a gland, an O-shaped sealing ring, a pressure spring, a supporting seat, a cam shaft, an inward-flow pressure regulating element and a lower plug; the lower end of the fishing rod is arranged in the upper end of the supporting seat, the gland bush is sleeved on the outer side of the fishing rod and is in threaded connection with the upper end of the supporting seat, a pressure spring is arranged between the lower end of the fishing rod and the gland bush, the gland bush and the supporting seat are sealed and anti-loose through an O-shaped sealing ring, the cam is fixed on the wall of the supporting seat through a cam shaft, an O-shaped sealing ring groove is arranged on the wall of the supporting seat, the lower end of the supporting seat is in threaded connection with the upper end of the inward flow type pressure adjusting element, the lower end of the inward flow type pressure adjusting element is in threaded connection with the lower plug, the O-shaped sealing ring groove is arranged on the outer side of the inward flow type pressure adjusting element, the O-shaped sealing ring groove is arranged on the outer wall of the lower plug, a liquid inlet is formed in the upper end of the inward flow type pressure adjusting element.
The outflow type pressure regulating blanking plug consists of a fishing rod, a gland, an O-shaped sealing ring, a pressure spring, a supporting seat, a cam shaft, an outflow type pressure regulating element and a lower plug; the lower end of the fishing rod is arranged in the upper end of the supporting seat, the pressing cover is sleeved on the outer side of the fishing rod and is in threaded connection with the upper end of the supporting seat, a pressure spring is arranged between the lower end of the fishing rod and the pressing cover, the pressing cover and the supporting seat are sealed and prevented from being loosened through an O-shaped sealing ring, the cam is fixed on the wall of the supporting seat through the cam shaft, an O-shaped sealing ring groove is formed in the wall of the supporting seat, the lower end of the supporting seat is in threaded connection with the upper end of the outward-flow type pressure adjusting element, the lower end of the outward-flow type pressure adjusting element is in threaded connection with the lower plug.
The outer diameter D2 of the internal flow type pressure adjusting element is 18 mm-19 mm, the diameter of the internal flow channel is 2 mm-8 mm, the internal flow type pressure adjusting element is composed of a plurality of internal flow type throttling units M, and the number of the throttling units M is 1-15.
The outer diameter D1 of the outflow type pressure adjusting element is 17mm, 17.5mm, 18.0mm and 18.5mm, the outflow type pressure adjusting element is composed of a plurality of outflow type throttling units N, and the number of the throttling units N is 1-10.
The value of R1 of the outflow type pressure regulating element throttling unit N is 1 mm-2 mm, the value of R3 is 2mm or 3mm, the length of L1 is 7 mm-11 mm, and the length of L2 is 6mm-20 mm.
The value of R1 of the inward flow type pressure regulating element throttling unit M is 1 mm-2 mm, the value of R3 is 2mm or 3mm, the length of L3 is 7 mm-11 mm, and the length of L4 is 1mm or 2 mm.
Compared with the prior art, the invention has the following advantages:
the injection device can realize low-injection-quantity and low-loss injection of three types of oil layers under the condition of low injection quantity, and provides an effective injection device for chemical-flooding injection of the three types of oil layers. The device has the advantages of simple and novel structure, repeated and multi-stage use, capability of throwing, dragging and replacing the pressure adjusting blanking plug in the double eccentric holes and the like.
Description of the drawings: FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic illustration of the construction of the in-flow pressure regulating plug 30 of the present invention;
FIG. 3 is a schematic structural view of an outflow pressure regulating plug 60 of the present invention;
FIG. 4 is a schematic illustration of the construction of the in-flow pressure regulating element 37 of the present invention;
FIG. 5 is a schematic structural view of an outflow pressure regulating element 61 of the present invention;
FIG. 6 is an enlarged partial schematic view of the in-flow pressure regulating element 37 of the present invention;
fig. 7 is a partially enlarged schematic view of an outflow pressure regulating element 61 of the present invention.
The specific implementation mode is as follows: the invention is further described below with reference to the accompanying drawings: a three-kind oil reservoir chemical flooding low-injection-quantity high-throttling low-damage layered injection device consists of a double-eccentric-hole separated injection device 10, an inward-flow pressure regulating plug 30 and an outward-flow pressure regulating plug 60;
the double-eccentric-hole eccentric separate injection device 10 comprises an upper joint 1, an O-shaped sealing ring 2, an upper connecting sleeve 3, a righting body 4, a double-eccentric-hole main body 5, a guide body 6, a conversion joint 7, a bolt 8 and a lower joint 9, wherein the upper joint 1 is in threaded connection with the upper end of the upper connecting sleeve 3 and is sealed through the O-shaped sealing ring 2, the lower end of the upper connecting sleeve 3 is in threaded connection with the upper end of the double-eccentric-hole main body 5 and is sealed through the O-shaped sealing ring 2, the lower end of the double-eccentric-hole main body 5 is in threaded connection with the upper end of the conversion joint 7 and is sealed through the O-shaped sealing ring 2, a liquid inlet is formed in the inner wall of the double-eccentric-hole main body 5, a liquid outlet is formed in the side wall of the double-eccentric-hole main body 5, the lower end of the conversion joint 7 is in threaded connection with the lower joint 9, the lower end of the righting body, the lower end of the guide body 6 is fixedly connected with the adapter 7 through a bolt 8;
the inward-flow pressure regulating plug 30 consists of a fishing rod 31, a gland 32, an O-shaped sealing ring 2, a pressure spring 33, a supporting seat 34, a cam 35, a cam shaft 36, an inward-flow pressure regulating element 37 and a lower plug 38; wherein the lower end of the fishing rod 31 is arranged in the upper end of the supporting seat 34, the gland 32 is sleeved on the outer side of the fishing rod 31 and is in threaded connection with the upper end of the supporting seat 34, a pressure spring 33 is arranged between the lower end of the fishing rod 31 and the gland 32, the gland 32 and the supporting seat 34 are sealed and anti-loose-buckled through an O-shaped sealing ring 2, a cam 35 is fixed on the wall of the supporting seat 34 through a cam shaft 36, the wall of the supporting seat 34 is provided with an O-shaped sealing ring 2 groove, the lower end of the supporting seat 34 is in threaded connection with the upper end of an inward flow type pressure adjusting element 37, the lower end of the inward flow type pressure adjusting element 37 is in threaded connection with a lower plug 38, the outer side of the inward flow type pressure adjusting element 37 is provided with the O-shaped sealing ring 2 groove, the outer wall of the lower plug 38 is provided with the O-shaped sealing ring 2 groove, the upper end of the inward flow type pressure adjusting element, the lower end of the pressure adjusting element 37 is provided with a liquid outlet hole;
the outflow type pressure adjusting plug 60 consists of a fishing rod 31, a gland 32, an O-shaped sealing ring 2, a pressure spring 33, a supporting seat 34, a cam 35, a cam shaft 36, an outflow type pressure adjusting element 61 and a lower plug 38; the lower end of the fishing rod 31 is arranged in the upper end of the supporting seat 34, the pressing cover 32 is sleeved on the outer side of the fishing rod 31 and is in threaded connection with the upper end of the supporting seat 34, the pressure spring 33 is arranged between the lower end of the fishing rod 31 and the pressing cover 32, the pressing cover 32 and the supporting seat 34 are sealed and anti-loose-buckled through the O-shaped sealing ring 2, the cam 35 is fixed on the wall of the supporting seat 34 through the cam shaft 36, the wall of the supporting seat 34 is provided with the O-shaped sealing ring 2 groove, the lower end of the supporting seat 34 is in threaded connection with the upper end of the outward flow type pressure adjusting element 61, the lower end of the outward flow type pressure adjusting element 61 is in threaded connection with the lower plug 38, and the.
The outer diameter D2 of the inward flow type pressure adjusting element 37 is 18 mm-19 mm, the diameter of the inward flow channel is 2 mm-8 mm, the inward flow type pressure adjusting element 37 is composed of a plurality of inward flow type throttling units M, and the number of the throttling units M is 1-15.
The outer diameter D1 of the outflow pressure adjusting element 61 is 17mm, 17.5mm, 18.0mm, 18.5mm, the outflow pressure adjusting element 61 is composed of a plurality of outflow throttling units N, and the number of the throttling units N is 1-10.
The angle of α of the throttling unit N of the outflow type pressure adjusting element 61 is 10-30 degrees, the angle of β is 30-45 degrees, the value of R1 is 1-2 mm, the value of R3 is 2mm or 3mm, the length of L1 is 7-11 mm, and the length of L2 is 6-20 mm.
The angle of theta of the throttling unit M of the inward-flow type pressure adjusting element 37 is 10-30 degrees, the angle of theta is 30-45 degrees, the value of R1 is 1-2 mm, the value of R3 is 2mm or 3mm, the length of L3 is 7-11 mm, and the length of L4 is 1mm or 2 mm.
The invention is mainly applied to chemical drive injection wells of three oil layers, and the chemical drive injection wells of the three oil layers which need to be injected in a layered mode are put into the device according to the requirements of oil reservoir development.
A plurality of double eccentric separate injection devices 10 in the three-type oil layer chemical flooding low-injection-quantity high-throttling low-damage layered injection device are connected through upper and lower joints to form an injection pipe column together with a packer, the injection pipe column is put into a well, the packer is released, after an oil layer is separated through the packer, an inward flow type pressure regulating blanking plug 30 and an outward flow type pressure regulating blanking plug 60 are put into double eccentric holes of the double eccentric separate injection device 10 through a throwing and fishing device, and throttling differential pressure under the condition of low injection quantity is increased through double functions of the inward flow type pressure regulating blanking plug 30 and the outward flow type pressure regulating blanking plug 60.
When the chemical flooding solution is injected into a downhole oil pipe by a ground polymer injection pump, the chemical flooding solution firstly enters a liquid inlet hole of the internal flow type pressure regulating blanking plug 30 through a liquid inlet hole on the inner wall of the double-eccentric-hole separate injection device 10, flows out of a liquid outlet hole of the internal flow type pressure regulating blanking plug 30 through an internal flow channel of an internal flow type throttling element 37 of the internal flow type pressure regulating blanking plug 30, flows through an annular space formed by an external pressure regulating element 61 of the external flow type pressure regulating blanking plug 60 and the inner wall of an eccentric hole of the double-eccentric-hole separate injection device 10, flows out of the liquid outlet hole of the double-eccentric-hole separate injection device 10 and enters a stratum. During the process that the chemical flooding solution flows through the inner flow channel of the inner throttling element 37 and the outer pressure adjusting element 61, local energy loss is generated due to the change of the flow field, and throttling differential pressure is formed. During on-site flow rate adjustment, the throttling differential pressure is controlled by adjusting the number of the throttling units M of the internal flow pressure adjusting element 37 of the internal flow pressure adjusting plug 30 and the number of the throttling units N of the external flow pressure adjusting element 61 of the external flow pressure adjusting plug 60, so that the layered flow rate is adjusted.
Claims (5)
1. A three-kind oil reservoir chemical flooding low-injection-quantity high-throttling low-damage layered injection device comprises a double-eccentric-hole separate injection device (10), an inward-flow pressure regulating plug (30) and an outward-flow pressure regulating plug (60);
the method is characterized in that: the double-eccentric-hole eccentric separate injection device (10) consists of an upper connector (1), an O-shaped sealing ring (2), an upper connecting sleeve (3), a centralizing body (4), a double-eccentric-hole main body (5), a guide body (6), a conversion connector (7), a bolt (8) and a lower connector (9), wherein the upper connector (1) is in threaded connection with the upper end of the upper connecting sleeve (3) and is sealed through the O-shaped sealing ring (2), the lower end of the upper connecting sleeve (3) is in threaded connection with the upper end of the double-eccentric-hole main body (5) and is sealed through the O-shaped sealing ring (2), the lower end of the double-eccentric-hole main body (5) is in threaded connection with the upper end of the conversion connector (7) and is sealed through the O-shaped sealing ring (2), a liquid inlet hole is formed in the inner wall of the double-eccentric-hole main body (5), a liquid outlet hole is formed in the side wall of the double-eccentric-hole main body (5), and the lower end, the lower end of the centralizing body (4) is fixedly connected with the end part of the double-eccentric-hole main body (5) through a bolt (8), the guide body (6) is arranged in the adapter (7), and the lower end of the guide body (6) is fixedly connected with the adapter (7) through the bolt (8);
the inward-flow pressure regulating blanking plug (30) consists of a fishing rod (31), a gland (32), an O-shaped sealing ring (2), a pressure spring (33), a supporting seat (34), a cam (35), a cam shaft (36), an inward-flow pressure regulating element (37) and a lower blanking plug (38); wherein the lower end of the fishing rod (31) is arranged in the upper end of the supporting seat (34), the gland (32) is sleeved on the outer side of the fishing rod (31) and is in threaded connection with the upper end of the supporting seat (34), a pressure spring (33) is arranged between the lower end of the fishing rod (31) and the gland (32), the gland (32) and the supporting seat (34) are sealed and prevented from being loosened through an O-shaped sealing ring (2), a cam (35) is fixed on the wall of the supporting seat (34) through a cam shaft (36), a groove of the O-shaped sealing ring (2) is arranged on the wall of the supporting seat (34), the lower end of the supporting seat (34) is in threaded connection with the upper end of an inward flow type pressure adjusting element (37), the lower end of the inward flow type pressure adjusting element (37) is in threaded connection with the lower plug (38), a groove of the O-shaped sealing ring (2) is arranged on the outer side of the inward flow type pressure adjusting element (37), a groove of the O-shaped, the upper end of the internal flow type pressure adjusting element (37) is provided with a liquid inlet hole, the liquid inlet hole is opposite to the position of the liquid inlet hole of the double eccentric hole main body (5) of the double eccentric hole separate injection device (10), and the lower end of the pressure adjusting element (37) is provided with a liquid outlet hole;
the outflow type pressure regulating blanking plug (60) consists of a fishing rod (31), a gland (32), an O-shaped 2 sealing ring (2), a pressure spring (33), a supporting seat (34), a cam (35), a cam shaft (36), an outflow type pressure regulating element (61) and a lower blanking plug (38); the lower end of the fishing rod (31) is arranged in the upper end of the supporting seat (34), the pressing cover (32) is sleeved on the outer side of the fishing rod (31) and is in threaded connection with the upper end of the supporting seat (34), a pressing spring (33) is arranged between the lower end of the fishing rod (31) and the pressing cover (32), the pressing cover (32) and the supporting seat (34) are sealed and prevented from being loosened through an O-shaped sealing ring (2), the cam (35) is fixed on the wall of the supporting seat (34) through a cam shaft (36), a groove of the O-shaped sealing ring (2) is formed in the wall of the supporting seat (34), the lower end of the supporting seat (34) is in threaded connection with the upper end of the outward flow type pressure adjusting element (61), the lower end of the outward flow type pressure adjusting element (61) is in threaded connection with the lower plug (38), and the groove of the O-shaped sealing ring (2) is.
2. The three-type reservoir chemical flooding low-injection-volume high-throttling low-damage layered injection device as claimed in claim 1, wherein: the outer diameter D2 of the inward flow type pressure adjusting element (37) is 18 mm-19 mm, the diameter of the inward flow channel is 2 mm-8 mm, the inward flow type pressure adjusting element (37) is composed of a plurality of inward flow type throttling units M, and the number of the throttling units M is 1-15.
3. The three-type reservoir chemical flooding low-injection-volume high-throttling low-damage layered injection device as claimed in claim 1, wherein: the outer diameter D1 of the outflow pressure adjusting element (61) is 17mm, 17.5mm, 18.0mm and 18.5mm, the outflow pressure adjusting element (61) is composed of a plurality of outflow throttling units N, and the number of the throttling units N is 1-10.
4. The three-type oil layer chemical flooding low-injection-quantity high-throttling low-damage layered injection device is characterized in that the R1 value of the throttling unit N of the outflow pressure adjusting element (61) is 1 mm-2 mm, the R3 value is 2mm or 3mm, the L1 length is 7 mm-11 mm, and the L2 length is 6mm-20 mm.
5. The three-type oil layer chemical flooding low-injection-quantity high-throttling low-damage layered injection device is characterized in that the R1 value of the throttling unit M of the inward flow type pressure regulating element (37) is 1 mm-2 mm, the R3 value is 2mm or 3mm, the L3 length is 7 mm-11 mm, and the L4 length is 1mm or 2 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911315437.3A CN111485862B (en) | 2019-12-19 | 2019-12-19 | Three kinds of oil reservoir chemical flooding low-injection-quantity high-throttling low-loss layered injection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911315437.3A CN111485862B (en) | 2019-12-19 | 2019-12-19 | Three kinds of oil reservoir chemical flooding low-injection-quantity high-throttling low-loss layered injection device |
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| CN111485862A true CN111485862A (en) | 2020-08-04 |
| CN111485862B CN111485862B (en) | 2022-06-03 |
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2019
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