Perforation and measurement combined operation pipe column for controlling underground shut-in and method thereof

Abstract

The invention relates to a pipe column and method for controlling underground shut-in shooting and testing combined operation. The pipe column comprises a vertically-arranged oil pipe, the outer side of the oil pipe is coaxially sleeved with a sleeve, an ignition assembly is arranged on the lower portion of the oil pipe, a testing assembly is arranged above the ignition assembly, and an intelligent switch tool is fixedly connected to the oil pipe. The tubular column has the advantages that perforation can be completed by one tubular column, downhole shut-in testing and pilot production work can be controlled, and the production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of oilfield technology development and testing engineering, and in particular to a downhole shut-in and radiometric combined operation string and method thereof. Background Art

[0002] Compared with the conventional perforation followed by the instrument, the perforation gun is connected to the bottom of the string, usually by pressurized ignition. The test instrument is connected in the middle, and the string assembly is transported to the designed position by oil pipe, and then the string depth is adjusted through magnetic positioning test to aim the perforating gun at the target layer. The well is opened and closed according to the design by annular pressure ignition, and the test is carried out to obtain the formation and fluid parameter data. One trip of the string can complete the perforation, testing and trial production, and the production efficiency is improved.

[0003] Regarding the above-mentioned related technologies, the inventors believe that since the existing process of switching wells is implemented on the ground, the corresponding formation parameters of conventional oil reservoirs can be obtained through pressure recovery and drawdown tests, while the formation properties of low-permeability oil reservoirs are poor and the wellbore storage effect time is long. It takes a long testing cycle to record valid data, and the overall construction period is still very long. Summary of the invention

[0004] In order to complete perforation, controlled downhole shut-in testing and trial production in one trip of the tubing string and improve production efficiency, the present application provides a controlled downhole shut-in and perforation-testing combined tubing string and method thereof.

[0005] The present application provides a control well shut-in radiometric combined operation string, which adopts the following technical solution:

[0006] A control downhole shut-in radiometric combined operation string comprises a vertically arranged oil pipe, a casing is coaxially sleeved on the outer side of the oil pipe, an ignition assembly is arranged at the lower part of the oil pipe, a test assembly is arranged above the ignition assembly, and an intelligent switch tool is fixedly connected to the oil pipe.

[0007] Optionally, the test assembly includes a pressure gauge holder fixed on the outside of the oil pipe, the pressure gauge holder is located below the intelligent switch tool, a packer is arranged between the oil pipe and the casing, a sealing nipple is fixedly connected to the inside of the oil pipe, and a pressure transmission assembly is passed through the inside of the oil pipe relative to the sealing nipple.

[0008] Optionally, the pressure gauge holder includes a shell, a pressure gauge is vertically arranged inside the shell, an elastic member is vertically arranged below the pressure gauge, and a rubber ring is provided inside the shell relative to the outer side of the pressure gauge.

[0009] Optionally, a tubular cavity is formed between the casing and the oil pipe, and the packer divides the tubular cavity into a first space located above the packer and a second space located below the packer.

[0010] Optionally, the sealing nipple divides the interior of the oil pipe into a first section located above the sealing nipple and a second section located below the sealing nipple, the first section and the second section are relatively connected through the pressure transmission component, and an oil drain is also provided above the pressure transmission nipple, and the oil drain is fixedly connected to the oil pipe.

[0011] Optionally, the pressure transmission component includes a vertically arranged pressure transmission pipe, the pressure transmission pipe is coaxially arranged with the oil pipe, the pressure transmission pipe passes through the sealing short joint, and the pressure transmission pipe relatively connects the first section and the second section.

[0012] Optionally, the oil pipe is fixedly connected to a pressure transmission nipple at a position located in the first space, the pressure transmission pipe extends into the interior of the pressure transmission nipple, a connecting hole is opened on the side wall of the pressure transmission nipple, and the connecting hole relatively connects the first space with the interior of the pressure transmission pipe.

[0013] Optionally, a shock absorber is fixedly connected to the oil pipe, and the shock absorber is located between the test component and the ignition component.

[0014] Optionally, the ignition assembly includes a perforating gun and an ignition head.

[0015] Optionally, a method for constructing a pipe string by combining radiometry and surveying is also provided, the method comprising:

[0016] S01: Preset the timed switch program of the intelligent switch tool according to the test plan.

[0017] Set the smart switch tool to off;

[0018] S02: lower the integrated pipe string according to the assembly sequence;

[0019] S03: Test the magnetic positioning curve, adjust the perforating gun position, and mechanically seal and isolate

[0020] and install the Christmas tree;

[0021] S04: The intelligent switch tool is turned on for the first time, so that the casing pressure at the bottom of the packer

[0022] force balance;

[0023] S05: 15 minutes before the first timed shutdown of the intelligent switch tool, the oil sleeve ring

[0024] Air pressurized ignition perforation;

[0025] S06: The intelligent switch tool acts according to the test plan and obtains valid test data;

[0027] S07: Open the oil drain, kill the well and then pull out the tubing.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. Based on the radiometric combined operation process, multiple downhole well opening and closing in two modes, surface pressure control and program preset control, are realized. The pipe string and construction process effectively integrate the advantages of radiometric combined operation process and downhole well closing process, providing an efficient technical means for obtaining the original formation physical property parameters during the oil testing process of low permeability reservoirs.

[0030] 2. It can realize multiple downhole opening and closing well control in two modes: surface pressurization and program preset.

[0031] 3. The use of multi-dimensional shock-absorbing downhole pressure gauge holder improves the stability of the instrument during the perforating operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of a control downhole shut-in radiometric measurement string in an embodiment of the present application.

[0033] Figure 2 It is a cross-sectional view of a control downhole shut-in radiographic surveying and measurement string in an embodiment of the present application.

[0034] Figure 3 It is a cross-sectional view of the internal structure of a pressure gauge holder for controlling a downhole shut-in radiometric measurement string in an embodiment of the present application.

[0035] Figure 4 It is a flow chart of a construction method for controlling downhole shut-in and radiometric measurement combined operation of a tubular column in an embodiment of the present application.

[0036] Explanation of the reference numerals: 1. tubing; 11. plug; 12. first section; 13. second section; 14. oil drain; 15. positioning nipple; 2. casing; 21. tube chamber; 211. first space; 212. second space; 3. ignition assembly; 31. ignition head; 32. perforating gun; 4. test assembly; 5. intelligent switch tool; 6. packer; 7. sealing nipple; 8. pressure transmission assembly; 81. pressure transmission pipe; 82. pressure transmission nipple; 9. shock absorber; 10. pressure gauge holder; 101. housing; 102. pressure gauge; 103. spring; 104. rubber ring. DETAILED DESCRIPTION

[0037] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0039] The following is combined with Figure 1-3 This application is described in further detail.

[0040] The present application embodiment discloses a control well shut-in and well-surveillance combined operation string. Figure 1 , Figure 2 A controlled downhole shut-in and radiometric combined operation string comprises a vertically arranged oil pipe 1, a casing 2 is sleeved on the outer side of the oil pipe 1, the oil pipe 1 and the casing 2 are coaxially arranged, and an ignition component 3 is arranged at the bottom end of the oil pipe 1, and a test component 4 for collecting data is arranged on the ignition component 3 of the oil pipe 1, and an intelligent switch tool 5 is fixedly connected to the oil pipe 1, and the intelligent switch tool 5 can realize multiple downhole well switching in two modes: ground pressurization control and program preset control.

[0041] The bottom end of the oil pipe 1 is threadedly connected with a plug 11, which is used to seal the bottom end of the oil pipe 1. A packer 6 is arranged between the oil pipe 1 and the casing 2, and the packer 6 is sleeved on the outside of the oil pipe 1, and the packer 6 and the oil pipe 1 are fixedly connected.

[0042] An annular space is formed between the oil pipe 1 and the casing 2 as a tubular chamber 21, the inner wall of the packer 6 abuts against the oil pipe 1, and the outer wall of the packer 6 abuts against the casing 2, so that the tubular chamber 21 is divided into a first space 211 located above the packer 6 and a second space 212 located below the packer 6 by the packer 6.

[0043] A sealing nipple 7 is fixedly connected inside the oil pipe 1, and the sealing nipple 7 divides the internal space of the oil pipe 1 into a first section 12 located above the sealing nipple 7 and a second section 13 located below the sealing nipple 7. The first section 12 and the second section 13 are relatively connected through a pressure transmission component 8.

[0044] The pressure transmission assembly 8 includes a pressure transmission pipe 81 vertically arranged inside the oil pipe 1. The pressure transmission pipe 81 is coaxially arranged with the oil pipe 1. One end of the pressure transmission pipe 81 passes through the interior of the sealing nipple 7, thereby relatively connecting the first section 12 and the second section 13.

[0045] A pressure transmission nipple 82 is fixedly connected to the inside of the oil pipe 1 above the packer 6, and the top end of the pressure transmission tube 81 extends into the inside of the pressure transmission nipple 82. A connecting hole is horizontally opened inside the pressure transmission nipple 82, one end of the connecting hole is relatively connected to the inside of the pressure transmission tube 81, and the other end of the connecting hole is connected to the first space 211, so that the pressure generated by the ignition assembly 3 is transmitted.

[0046] A shock absorber 9 is fixedly connected to the interior of the oil pipe 1 above the ignition assembly 3, and the pressure transmission pipe 81 passes through the interior of the shock absorber 9. The shock absorber 9 performs two-stage shock absorption to absorb and reduce the impact of the vibration generated during perforating on the upper test assembly 4 and the intelligent switch tool 5, thereby improving the reliability of the test assembly 4 and the intelligent switch tool 5.

[0047] The ignition assembly 3 includes an ignition head 31 disposed opposite to the oil layer and a perforating gun 32. The perforating gun 32 is preset according to the designed perforating depth and perforating thickness.

[0048] Reference Figure 2 , Figure 3 The test assembly 4 includes a pressure gauge holder 10 disposed between the intelligent switch tool 5 and the sealing nipple 7. The pressure gauge holder 10 is fixedly connected to the oil pipe 1. The pressure gauge holder 10 includes a housing 101. The housing 101 is vertically disposed. A pressure gauge 102 is vertically disposed inside the housing 101. The pressure gauge 102 is slidably connected to the housing 101. A spring 103 is vertically disposed inside the housing 101 below the pressure gauge 102. One end of the spring 103 is fixedly abutted against the pressure gauge 102, and the other end of the spring 103 is fixedly abutted against the inner wall of the housing 101. A rubber ring 104 is sleeved on the outer wall of the pressure gauge 102. The rubber ring 104 is coaxially disposed with the pressure gauge 102, and the outer side of the rubber ring 104 is abutted against the inner wall of the housing 101. The spring 103 is used to reduce the vibration of the pressure gauge 102 in the axial direction, and the rubber ring 104 is used to reduce the vibration of the pressure gauge 102 in the radial direction.

[0049] An oil drain 14 is coaxially arranged above the pressure transmission nipple 82 of the oil pipe 1 . The oil drain 14 is fixedly connected to the oil pipe 1 . The oil drain 14 relatively connects the inner space of the oil pipe 1 with the tube chamber 21 for implementing the liquid surface hollowing process.

[0050] A positioning nipple 15 is coaxially arranged above the oil drain 14 on the oil pipe 1 . The positioning nipple 15 is fixedly connected to the oil pipe 1 . The positioning nipple 15 is used to adjust the marking position of the pipe string depth.

[0051] Reference Figure 2 , Figure 4 The present application also discloses a construction method of a radiometric combined pipe string, including:

[0052] S01: preset the timed on / off program of the intelligent switch tool 5 according to the test plan; initially set the intelligent switch tool 5 to be off;

[0053] S02: The integrated string is installed in the order of a plug 11, a perforating gun 32, multiple oil pipes 1, a shock absorber 9, a sealing sub 7 (connected to a pressure transmission pipe 81), a pressure gauge holder 10, an intelligent switch tool 5, a packer 6, a pressure transmission sub 82 (connected to a pressure transmission pipe 81), an oil pipe 1, an oil drain 14, a positioning sub 15 - an oil pipe 1, and the intelligent shut-in tool is initially set to be closed;

[0054] S03: After testing the magnetic positioning curve and adjusting the position of the perforating gun 32, the packer 6 is mechanically set and the Christmas tree is installed;

[0055] S04: the intelligent switch tool 5 is opened for the first time to balance the pressure of the oil casing below the packer 6;

[0056] S05: 15 minutes before the first scheduled shutdown of the intelligent switch tool 5, the casing annulus is pressurized and ignited for perforation;

[0057] S06: The intelligent switch tool 5 performs actions according to the test plan and obtains valid test data;

[0058] S07: Open the oil drain 14, and pull out the tubing string after killing the well.

[0059] In the present invention, the term "plurality" means at least two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0060] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", 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.

Claims

1. A control string for shutting down the well and performing radiometric measurement. Features: The invention comprises a vertically arranged oil pipe (1), a sleeve (2) is coaxially sleeved on the outer side of the oil pipe (1), an ignition assembly (3) is arranged at the lower part of the oil pipe (1), a test assembly (4) is arranged above the ignition assembly (3), and an intelligent switch tool (5) is fixedly connected to the oil pipe (1).

2. A downhole shut-in radiographic surveying and joint operation string according to claim 1, Features: The test assembly (4) comprises a pressure gauge holder (10) fixed on the outside of the oil pipe (1), the pressure gauge holder (10) being located below the intelligent switch tool (5), a packer (6) being arranged between the oil pipe (1) and the casing (2), a sealing nipple (7) being fixedly connected to the inside of the oil pipe (1), and a pressure transmission assembly (8) being passed through the inside of the oil pipe (1) relative to the sealing nipple (7).

3. A downhole shut-in radiographic surveying and joint operation string according to claim 2, Features: The pressure gauge holder (10) comprises an outer shell (101), a pressure gauge (102) is vertically arranged inside the outer shell (101), an elastic member is vertically arranged below the pressure gauge (102), and a rubber ring (104) is sleeved inside the outer shell (101) relative to the outer side of the pressure gauge (102).

4. According to claim 2, a downhole shut-in radiographic measurement string is used to control downhole shut-in, Features: A tubular chamber (21) is formed between the casing (2) and the oil pipe (1), and the packer (6) divides the tubular chamber (21) into a first space (211) located above the packer (6) and a second space (212) located below the packer (6).

5. According to claim 2, a downhole shut-in and radiometric combined operation string is used for controlling downhole shut-in and radiometric combined operation. Features: The sealing nipple (7) divides the interior of the oil pipe (1) into a first section (12) located above the sealing nipple (7) and a second section (13) located below the sealing nipple (7); the first section (12) and the second section (13) are relatively connected via the pressure transmission component (8); an oil drain (14) is also provided above the pressure transmission nipple (82); the oil drain (14) is fixedly connected to the oil pipe (1).

6. A downhole shut-in radiographic surveying and joint operation string according to claim 5, Features: The pressure transmission component (8) comprises a vertically arranged pressure transmission pipe (81), the pressure transmission pipe (81) being coaxially arranged with the oil pipe (1), the pressure transmission pipe (81) passing through the sealing nipple (7), and the pressure transmission pipe (81) relatively connecting the first section (12) and the second section (13).

7. A downhole shut-in radiographic surveying and joint operation string according to claim 4 or 6, Features: The oil pipe (1) is fixedly connected to a pressure transmission nipple (82) at a position located in the first space (211); the pressure transmission pipe (81) extends into the interior of the pressure transmission nipple (82); a connecting hole is provided on the side wall of the pressure transmission nipple (82); the connecting hole relatively connects the first space (211) with the interior of the pressure transmission pipe (81).

8. A downhole shut-in radiographic surveying and joint operation string according to claim 1, Features: A shock absorber (9) is fixedly connected to the oil pipe (1), and the shock absorber (9) is located between the test component (4) and the ignition component (3).

9. A downhole shut-in radiographic surveying and joint operation string according to claim 1, Features: The ignition assembly (3) comprises a perforating gun (32) and an ignition head (31).

10. A method for constructing a pipe string by combining radiometry and surveying. It is characterized in that The method for controlling downhole shut-in and radiometric measurement combined operation string according to any one of claims 1 to 9 comprises: S01: presetting the timed switch program of the intelligent switch tool (5) according to the test plan, and initially setting the intelligent switch tool (5) to be turned off; S02: lower the integrated pipe string according to the assembly sequence; S03: testing the magnetic positioning curve, adjusting the position of the perforating gun (32), mechanically setting the packer (6), and installing the Christmas tree; S04: the intelligent switch tool (5) is opened for the first time, so that the pressure of the oil casing below the packer (6) is balanced; S05: 15 minutes before the first timed shutdown of the intelligent switch tool (5), the casing annulus is pressurized and ignited for perforation; S06: The intelligent switch tool (5) designs actions according to the test plan and obtains valid test data; S07: Open the oil drain (14), kill the well and then pull out the pipe string.

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