Oil well pressure pulse control separate production method and pipe column

Abstract

The invention relates to the technical field of oil field separate-layer oil production, and particularly discloses an oil well pressure pulse control separate-layer oil production tubular column, an intelligent separate-layer oil production device is arranged in the tubular column, the intelligent separate-layer oil production device comprises two oil inlet channels capable of regulating and controlling the liquid inlet flow, and an inlet of one oil inlet channel is formed in the side wall of the tubular column; the intelligent separate recovery device is connected with the pulse receiver through a signal line, the output end of the intelligent separate recovery device is connected with an oil well pump, the oil well pump is connected with a sucker rod and pumps oil out through the sucker rod, a packer is connected to the outside of the tubular column and arranged below the intelligent separate recovery device, a screen pipe is connected to the tubular column below the packer, and the screen pipe is connected with the output end of the intelligent separate recovery device. And the screen pipe is communicated with an inlet of the other oil inlet channel. According to the tubular column, specific pressure pulse codes can be generated in a shaft sleeve through the pressure pulse generator, after the pulse receiver detects and analyzes the codes, the intelligent separate recovery device is controlled to automatically adjust different opening degrees of oil nozzles of corresponding production layers according to different pulse instructions, and oil layer separate recovery is achieved without moving the tubular column.

Description

Technical Field

[0001] The invention relates to the technical field of oil field stratified oil production, in particular to an oil well pressure pulse controlled stratified oil production method and a pipe string. Background Art

[0002] The oil reservoirs in the superimposed area of ​​the oil field are mainly developed by directional well water injection, with serious bottom hole degassing and high gas-oil ratio of the oil wells (98.6-120m 3 / t); small interlayer spacing (30-160m), poor compatibility of interlayer fluids; deep wells (mainly above 2000m), and some wells are seriously waxed. Layered oil production technology is currently an important means to alleviate interlayer and plane conflicts, expand injection sweep volume, fully develop medium and low permeability reservoirs, and realize deep tapping of remaining oil in multi-layer superimposed reservoirs.

[0003] As the development of oil fields continues to deepen, the contradictions faced are constantly changing, and the functions and implementation methods of stratified oil production technology are also evolving, from "self-flowing stratified production allocation" to "machine-produced wells to find water plugging", to "hydraulic adjustable layers", to the current "intelligent stratified oil production", and the supporting stratified production allocation tools, packers, adjustment processes, etc. have also changed accordingly. At present, the main intelligent stratified oil production technologies include cable control, vibration wave control and other electronically controlled stratified oil production technologies, which realize online real-time monitoring of downhole stratified production, water content, pressure and other parameters, collect a large amount of continuous monitoring data, and provide a big data foundation for reservoir dynamic analysis and optimization. Since high-water-content layers are usually also the main production layers, fully opening the downhole oil nozzle will aggravate the imbalance of layer development, and direct plugging will affect the production of a single well and reduce the efficiency of the whole well. The above-mentioned electronically controlled stratified oil production not only realizes the arbitrary adjustment of the downhole oil nozzle, but also has the ability to adjust in real time according to the development plan, truly changing "water plugging" to "water control". Therefore, stratified oil production has officially entered the "intelligent" development stage. However, due to problems such as small adaptability, short service time and high cost, it is still in the exploratory stage. Summary of the invention

[0004] The present invention is particularly aimed at the double-layer oil reservoir, and the contradiction between some well layers and planes is prominent. It proposes a method and a string for oil well pressure pulse production. A pressure pulse generator is used to generate a specific pressure pulse code in the wellbore casing. After the pulse receiver detects and analyzes it, the intelligent production device is controlled to automatically adjust the different openings of the corresponding production layer oil nozzle according to different pulse instructions, and the oil layer production is realized without moving the string. The purpose of the present invention can be achieved by the following technical solutions:

[0005] A pressure pulse controlled production string for an oil well, wherein an intelligent production device is arranged in the string, and the intelligent production device comprises two oil inlet channels with adjustable liquid flow rate, wherein the inlet of one of the oil inlet channels is arranged on the side wall of the string, and the intelligent production device is connected to a pulse receiver via a signal line, and the pulse receiver is used to receive pulses emitted by a pulse signal generator for controlling the opening of the two oil inlet channels, and the output end of the intelligent production device is connected to an oil pump, and the oil pump is connected to a sucker rod, and the oil pump extracts oil through the sucker rod, and a packer is connected to the outside of the string, and the packer is arranged below the intelligent production device and is used to seal the string, and a screen pipe is connected to the string below the packer, and the screen pipe is communicated with the inlet of another oil inlet channel.

[0006] In a further solution, the intelligent sampler includes a bridge sampler body, the two oil inlet channels are respectively a central flow channel and a side flow channel on the bridge sampler body, and the oil inlet channels are both provided with electric valves for controlling the liquid inlet flow rate.

[0007] In a further solution, the pulse signal generator is arranged at the wellhead.

[0008] In a further embodiment, the pulse signal generator is connected to a control center controller via remote control.

[0009] In a further solution, the packer is a sealing packer, which can be used to seal the flow channel between the casing and the pipe string.

[0010] In a further embodiment, the screen tube is an integrally cut screen tube.

[0011] In a further embodiment, the screen pipe is connected to the pipe string via threads.

[0012] On the other hand, the present invention also provides an oil well pressure pulse controlled production method using the above-mentioned pipe string.

[0013] In a further embodiment, the separation step comprises:

[0014] The pipe string is lowered into the section to be produced underground, and the two production layers are separated by sealing the separator;

[0015] The pressure pulser installed on the wellhead production pipeline generates a pulse command;

[0016] The pulse receiver detects and analyzes the pressure pulse instructions from the wellhead to obtain control instructions;

[0017] The pulse receiver issues instructions to the intelligent sampler connected to its cable;

[0018] The intelligent sub-collector receives the instruction and transmits it to the electric valve on the oil inlet channel. The two electric valves independently control the opening of the oil inlet channels of the two production layers, and the two oil inlet channels are pumped out together by the oil pump.

[0019] In a further embodiment, the instructions are determined based on the production, water content and pressure detected in the production zone.

[0020] Beneficial effects of the present invention:

[0021] The present invention generates specific pressure pulse codes in the wellbore through a pressure pulse generator. After the pulse receiver detects and analyzes it, it controls the intelligent sub-collector to automatically adjust the opening of the oil nozzles of each production layer, ultimately achieving efficient development of the oil reservoir. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of a connection of a production string for oil well pressure pulse control in an embodiment of the present invention;

[0024] In the figure: 1. pulse signal generator; 2. casing; 3. tubing; 4. sucker rod; 5. pulse receiver; 6. cable; 7. oil pump; 8. intelligent extraction device; 9. first oil layer; 10. packer; 11. second oil layer; 12. screen. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] like Figure 1As shown, an oil well pressure pulse controlled production string, wherein an intelligent production device 8 is arranged in the string 3, and the intelligent production device 8 includes two oil inlet channels with adjustable liquid flow rate, wherein the inlet of one of the oil inlet channels is arranged on the side wall of the string, and the intelligent production device 8 is connected to a pulse receiver 5 through a signal line 6, and the pulse receiver 5 is used to receive pulses emitted by a pulse signal generator 1 for controlling the opening of the two oil inlet channels, and the output end of the intelligent production device 8 is connected to a pump 7, and the pump 7 is connected to a sucker rod 4, and the pump 7 extracts oil through the sucker rod 4, and the string 3 is externally connected to a packer 10, and the packer 10 is arranged below the intelligent production device 8 and is used to seal the string 3, and a screen tube 12 is connected to the string 3 below the packer 10, and the screen tube 12 is communicated with the inlet of another oil inlet channel. The length of the pipe string and the screen tube is only shown schematically. The actual length can be adjusted appropriately according to the length of the layered section. The intelligent sub-sampler, pulse receiver, oil pump, etc. can all be connected with existing commonly used equipment. Figure 1 The drawing is just a schematic representation.

[0027] Its working principle is that for double-layer oil reservoirs, such as Figure 1 The first oil layer 9 and the second oil layer 11 are located in the well. The sub-production string is lowered into the target layer. The first oil layer 9 and the second oil layer 11 are separated by the packer 10. A specific pressure pulse code is generated to the pressure pulser 1 installed on the wellhead production pipeline. The pulse receiver 5 on the upper string of the oil pump 7 detects and analyzes the pressure pulse from the wellhead to obtain a control instruction. The pulse receiver 5 issues instructions to the intelligent sub-production device 8 connected to its cable. The intelligent sub-production device 8 receives the instructions and adjusts the opening of the bridge channel to achieve independent control of the opening of the oil nozzles of the two production layers. Different pulse instructions correspond to different openings of the oil nozzles of the production layers. The two production layers are fed with liquid in the following manner: the fluid of the first oil layer 9 enters the string through the oil inlet channel on the side of the string, and the fluid of the second oil layer 11 enters the string through the screen tube 12.

[0028] By adjusting the opening sizes of different oil layers through pulse pressure, separate and rotational production of two oil layers can be achieved. The ground pulse generator is interconnected with the production center, and remote control can be realized.

[0029] According to the above working principle, some preferred embodiment structures or methods are provided, wherein the intelligent separator 8 includes a bridge separator body, the two oil inlet channels are respectively a central flow channel and a side flow channel on the bridge separator body, and the oil inlet channels are each provided with an electric valve for controlling the liquid inlet flow rate. The bridge type extractor is a commonly used mechanical extractor, which mainly includes an upper joint, a steel ball shield, a ball seat body, a steel ball straightener, a steel ball, a ball seat sealing ring, a ball seat, an axial sealing ring, a filter sleeve and a lower joint. The lower part of the upper joint is connected to the lower joint sealed by the axial sealing ring; the middle outer wall of the lower joint is connected to the filter sleeve with a flow hole, the upper part of the lower joint is provided with a central single-flow channel connected to the flow hole of the filter sleeve, and the lower joint cylinder wall is evenly distributed with bridge holes that are not connected to the central single-flow channel; the top of the central single-flow channel is connected to the ball seat body, and a ball seat sealed by a sealing ring is provided on the step inside the ball seat body. A steel ball straightener and a steel ball are provided above the ball seat, and the top of the ball seat body is connected to the steel ball shield, and an electric valve is connected to the central single-flow channel and the channel at the bridge hole of the lower joint to control the opening size, so as to adapt to automatic flow control in different oil layers and different time periods.

[0030] The pulse signal generator 1 is arranged at the wellhead, which is convenient for regulation and maintenance at the wellhead.

[0031] The pulse signal generator 1 is connected to the control center controller through remote control. In this way, after being connected to the remote monitoring device, it is convenient to encode the remote control instructions so that the instructions can better meet the requirements of the actual mining situation.

[0032] The packer 10 is a sealing packer 10, which can be used to seal the flow channel between the casing and the pipe string 3. The number of the setting packer is not limited to one, and the setting packer is also a common setting tool and can be directly selected.

[0033] The screen tube 12 is an integrally cut screen tube 12. In this way, the screen tube 12 has higher strength and longer service life, and is used in the stratified production process to facilitate control of flow size in the stratified section, and clean oil layer fluid is generally placed in the stratified section with large flow.

[0034] The screen tube 12 is connected to the pipe column 3 by threads, so that the replacement of the screen tube 12 is convenient.

[0035] The specific separation method uses the above-mentioned column 3.

[0036] The separation step comprises:

[0037] The pipe string 3 is lowered into the section to be produced underground, and the two production layers are separated by sealing the separator;

[0038] The pressure pulser installed on the wellhead production pipeline generates a pulse command;

[0039] The pulse receiver 5 detects and analyzes the pressure pulse command from the wellhead to obtain the control command;

[0040] The pulse receiver 5 issues instructions to the intelligent sampler 8 connected to its cable;

[0041] The intelligent sub-collector 8 receives the instruction and transmits it to the electric valve on the oil inlet channel. The two electric valves independently control the opening of the oil inlet channels of the two production layers, and the two oil inlet channels are pumped out together through the oil pump 7.

[0042] The instructions are determined according to the production, water content and pressure detected in the production layer. If the detected production is high, the water content is high and the pressure is high, then the opening of the inlet channel at the electric valve is increased through the coded instruction, which is more convenient for rapid exploitation of the oil layer. Otherwise, the opening is controlled to be reduced.

[0043] It should be noted that the terms "first", "second" etc. in the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged in appropriate circumstances, so that the embodiments of the present application described here. In the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" etc. are based on the orientation or positional relationship shown in the accompanying drawings.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An oil well pressure pulse controlled production string, characterized in that: An intelligent extractor (8) is arranged inside the tubing column (3), and the intelligent extractor (8) comprises two oil inlet channels with adjustable liquid inlet flow rates, wherein the entrance of one of the oil inlet channels is arranged on the side wall of the tubing column. The intelligent extractor (8) is connected to a pulse receiver (5) via a signal line (6), and the pulse receiver (5) is used to receive pulses emitted by a pulse signal generator (1) for controlling the openings of the two oil inlet channels. The output end of the intelligent extractor (8) is connected to an oil pump (7), and the oil pump (7) is connected to a sucker rod (4), and the oil pump (7) extracts oil through the sucker rod (4). The tubing column (3) is externally connected to a packer (10), and the packer (10) is arranged below the intelligent extractor (8) and is used to seal the tubing column (3). A screen tube (12) is connected to the tubing column (3) below the packer (10), and the screen tube (12) is connected to the entrance of the other oil inlet channel.

2. The oil well pressure pulse controlled production string according to claim 1, characterized in that: The intelligent sampler (8) comprises a bridge sampler body, the two oil inlet channels are respectively a central flow channel and a side flow channel on the bridge sampler body, and the oil inlet channels are both provided with electric valves for controlling the inlet flow rate.

3. The oil well pressure pulse controlled production string according to claim 1, characterized in that: The pulse signal generator (1) is arranged at the wellhead.

4. The oil well pressure pulse controlled production string according to claim 1, characterized in that: The pulse signal generator (1) is connected to a control center controller via remote control.

5. The oil well pressure pulse controlled production string according to claim 1, characterized in that: The packer (10) is a sealing packer (10), and the sealing packer (10) can be used to seal the flow channel between the casing (2) and the pipe column (3).

6. The oil well pressure pulse controlled production string according to claim 1, characterized in that: The screen tube (12) is an integrally cut screen tube (12).

7. The oil well pressure pulse controlled production string according to claim 1, characterized in that: The screen pipe (12) is connected to the pipe column (3) via threads.

8. An oil well pressure pulse controlled production method, characterized in that: Use the tubular column (3) described in any one of claims 1 to 7.

9. The oil well pressure pulse controlled production method according to claim 8, characterized in that: The separation step comprises: The pipe string (3) is lowered into the section to be produced underground, and the two production layers are separated by sealing the separator; The pressure pulser installed on the wellhead production pipeline generates a pulse command; The pulse receiver (5) detects and analyzes the pressure pulse command from the wellhead to obtain the control command; The pulse receiver (5) issues instructions to the intelligent sampler (8) connected to the pulse receiver by cable; The intelligent sub-collector (8) receives the instruction and transmits it to the electric valve on the oil inlet channel. The two electric valves independently control the opening of the oil inlet channels of the two production layers. The two oil inlet channels are pumped out together through the oil pump (7).

10. The oil well pressure pulse controlled production method according to claim 9, characterized in that: The instructions are determined based on the production rate, water content and pressure detected during production layer detection.

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