Non-interlayer horizontal well subdivision water control process pipe column

Abstract

The invention discloses an interlayer-free horizontal well subdivision water control process pipe column. Comprising a sand control screen; a first tubular column; the first annulus chemical packer and the second annulus chemical packer are sequentially injected through the injection valve and are displaced to the position between the first packer and the second packer through displacement liquid, and the first tubular column is removed after injection is completed; the second pipe column is tripped into the horizontal well after the first pipe column is removed, and the lower middle portion of the second pipe column is inserted into the sand control screen pipe; a first electric control bottom-hole regulator is arranged between the second positioning seal and the third packer on the second tubular column; a second electric control bottom-hole regulator is arranged between the third packer and the fourth packer on the second tubular column; a third electric control bottom-hole regulator is arranged at the lower part of the fourth packer on the second tubular column; and a signal cable. The oil stabilizing and water controlling device has the beneficial effect that the purpose of oil stabilizing and water controlling of the interlayer-free horizontal well can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of petrochemical industry, and in particular to a water control process pipe string for a horizontal well with compartments without interlayers. Background Art

[0002] Offshore oilfield production wells are mainly developed in the form of directional wells and horizontal wells. Some horizontal wells have large liquid production and high water content, and the platform processing capacity is limited, resulting in the shutdown of some wells with high water content, resulting in loss of oilfield production capacity. There are three main water flooding modes for horizontal wells: linear overall water flooding, multi-point overall / local water flooding, and point-like local water flooding. Under the condition of no interlayer in the formation, horizontal wells are mostly produced by combined production, without effective water control measures, resulting in the inability to reduce water content. Therefore, there is an urgent need for a compartmented water control process string for horizontal wells without interlayers to achieve stable oil and water control in horizontal wells without interlayers. Summary of the invention

[0003] The purpose of the present invention is to provide a compartmented water control process string for a horizontal well without interlayer, which injects a first annulus chemical packer and a second annulus chemical packer into the space between the sand screen and the horizontal well formation through the injection valve of the first string, artificially creates a longer buffer compartment, and increases the difficulty of formation water entering the wellbore. When the water content of the produced fluid changes / rises rapidly, a chemical plugging agent is injected into the buffer compartment through the second electrically controlled production distributor of the second string, and an artificial barrier is created in the near-wellbore area. The formation fluid in the buffer compartment can only enter the second string through the first electrically controlled production distributor and the third electrically controlled production distributor, thereby increasing the seepage resistance of the produced fluid in the buffer compartment and achieving the purpose of stabilizing oil and controlling water in the horizontal well without interlayer.

[0004] To achieve the above object, the present invention adopts the following technical solutions, including:

[0005] A sand control screen, the front end of which is set in the horizontal well through a top packer;

[0006] A first tubing string is lowered into the horizontal well, a middle and lower portion of the first tubing string is inserted into the sand control screen, a first positioning seal matched with the top packer is provided in the middle portion of the first tubing string; a first packer and a second packer are provided at intervals in the middle and lower portion of the first tubing string; an injection valve is provided between the first packer and the second packer;

[0007] The first annulus chemical packer and the second annulus chemical packer are respectively set in the space between the sand control screen and the horizontal well formation, and are respectively injected by the injection valve in sequence and displaced by displacement fluid to between the first packer and the second packer. After the injection is completed, the first string is removed;

[0008] A second tubing string is lowered into the horizontal well after the first tubing string is removed, and the middle and lower part of the second tubing string is inserted into the sand control screen; a Y-joint is provided at the upper part of the second tubing string, a liquid inlet end on one side of the lower part of the Y-joint is connected to an electric pump unit, and a liquid inlet end on the other side of the lower part of the Y-joint is connected to a bypass pipeline, a plurality of liquid inlet holes are provided at the lower part of the bypass pipeline, and a sliding sleeve is provided at the liquid inlet hole; a second positioning seal matching with the top packer is provided at the middle part of the second tubing string; a third packer and a fourth packer are provided at intervals at the middle and lower part of the second tubing string; a first electrically controlled production distributor is provided between the second positioning seal and the third packer on the second tubing string; a second electrically controlled production distributor is provided between the third packer and the fourth packer on the second tubing string; a third electrically controlled production distributor is provided at the lower part of the fourth packer on the second tubing string;

[0009] A signal cable is lowered into the horizontal well in parallel with the second string, and the signal cable is electrically connected to the first electric-controlled production distributor, the second electric-controlled production distributor and the third electric-controlled production distributor respectively.

[0010] Preferably, a first anti-leakage valve is provided at the end of the first tubing string, and a first round plug is provided at the end of the first anti-leakage valve.

[0011] Preferably, a first safety joint is provided above the first positioning seal in the middle of the first tubular string.

[0012] Preferably, a second anti-leakage valve is provided at the end of the second tubing string, and a second round plug is provided at the end of the second anti-leakage valve.

[0013] Preferably, a second safety joint is provided above the second positioning seal in the middle of the second tubing string; and a third safety joint is provided between the first electric-controlled production distributor and the third packer on the second tubing string.

[0014] Preferably, it also includes:

[0015] A cable packer, which is arranged between the second string and the wall of the horizontal well and is used for the signal cable to pass through;

[0016] A safety valve is arranged on the second tubing string and is located above the cable packer.

[0017] The beneficial effects of the present invention are as follows: the first annulus chemical packer and the second annulus chemical packer are injected into the space between the sand screen and the horizontal well formation through the injection valve of the first string, so as to artificially create a longer buffer chamber, thereby increasing the difficulty of formation water entering the wellbore; when the water content of the produced fluid changes / rises rapidly, a chemical plugging agent is injected into the buffer chamber through the second electrically-controlled production distributor of the second string, so as to create an artificial barrier near the wellbore; the formation fluid in the buffer chamber can only enter the second string through the first electrically-controlled production distributor and the third electrically-controlled production distributor, thereby increasing the seepage resistance of the produced fluid in the buffer chamber and achieving the purpose of stabilizing oil and controlling water in the horizontal well without barrier interlayer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the first trip of the tubing string being lowered into the horizontal well in the present invention (the state when the second annulus chemical packer is injected).

[0019] Figure 2 This is a schematic diagram of the second trip of the tubing string being lowered into the horizontal well in the present invention.

[0020] Figure 3 It is a schematic diagram of point-like water appearance applicable to the present invention. DETAILED DESCRIPTION

[0021] The invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description.

[0022] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or other elements or combinations thereof.

[0023] like Figure 1-3 As shown, a water control process string 1 for a horizontal well with compartments without interlayers of the present invention comprises:

[0024] A sand control screen 100, the front end of which is arranged in the horizontal well 2 through a top packer 110;

[0025] A first tubing string 200 is lowered into the horizontal well 2, a middle and lower portion of the first tubing string 200 is inserted into the sand control screen 100, a first positioning seal 210 matched with the top packer 110 is provided in the middle portion of the first tubing string 200; a first packer 220 and a second packer 230 are provided at intervals in the middle and lower portion of the first tubing string 200; an injection valve 240 is provided between the first packer 220 and the second packer 230;

[0026] The first annular chemical packer 2501 and the second annular chemical packer 2502 are respectively set in the space between the sand screen 100 and the horizontal well 2 formation, and are respectively injected in sequence by the injection valve 240 and displaced by displacement fluid to between the first packer 220 and the second packer 230. After the injection is completed, the first trip string 200 is removed;

[0027] The second string 300 is lowered into the horizontal well 2 after the first string 200 is removed, and the middle and lower part of the second string 300 is inserted into the sand control screen 100; a Y-joint 310 is provided at the upper part of the second string 300, and an electric pump unit 311 is connected to a liquid inlet end on one side of the lower part of the Y-joint 310, and a bypass pipeline 312 is connected to a liquid inlet end on the other side of the lower part of the Y-joint 310, and a plurality of liquid inlet holes are provided at the lower part of the bypass pipeline 312, and a sliding sleeve 313 is provided at the liquid inlet hole; a Y-joint 310 is provided at the middle part of the second string 300, which is connected to the top isolation pipe 311. A second positioning seal 320 matched with the device 110; a third packer 330 and a fourth packer 340 are arranged at intervals in the middle and lower part of the second string 300; a first electric-controlled production distributor 350 is provided between the second positioning seal 320 and the third packer 330 on the second string 300; a second electric-controlled production distributor 360 is provided between the third packer 330 and the fourth packer 340 on the second string 300; a third electric-controlled production distributor 370 is provided at the lower part of the fourth packer 340 on the second string 300;

[0028] The signal cable 380 is lowered into the horizontal well 2 in parallel with the second string 300 , and the signal cable 380 is electrically connected to the first electric control distributor 350 , the second electric control distributor 360 , and the third electric control distributor 370 , respectively.

[0029] During use, the sand screen 100 is first lowered into the horizontal well 2, and fixed in the horizontal well 2 by the top packer 110 arranged at the front end of the sand screen 100; then the first string 200 is lowered into the horizontal well 2, and the first annular chemical packer 2501 is injected into the space between the sand screen 100 and the formation of the horizontal well 2 through the injection valve 240 of the first string 200, and the first annular chemical packer 2501 is displaced to between the first packer 220 and the second packer 230 by the displacement fluid, and then the first string 200 is lifted to a position above the top packer 110, and waits for 10-24 hours to solidify. After the solidification is completed, the first string 200 is lowered to the original injection position The first string 200 is placed and tested for sealing by wellhead pressure. After the sealing is qualified, the pipe string is lifted to the second injection point, and the second annulus chemical packer 2502 is injected into the space between the sand screen 100 and the horizontal well 2 formation through the injection valve 240 of the first string 200. The second annulus chemical packer 2502 is displaced to the predetermined position between the first packer 220 and the second packer 230 by the displacement fluid, and the first string 200 is lifted to the position above the top packer 110, and waited for 10-24 hours. After the waiting for solidification, the first string 200 is lowered to the original injection position and tested for sealing by wellhead pressure. After the sealing is qualified, the injection string is lifted to the wellhead; the second string 300 is lowered. Figure 3 As shown, the pipe section where the first electrically controlled production distributor 350 is located is section A, the pipe section where the second electrically controlled production distributor 360 is located is section B, and the pipe section where the third electrically controlled production distributor 370 is located is section C, and area D represents point-like local flooding; when the water content of the produced fluid changes / rises rapidly, chemical plugging agents are injected into the buffer tank through the second electrically controlled production distributor 360 of the second string 300 to create an artificial barrier in the near-wellbore area, and the formation fluid in the buffer tank can only enter the second string 300 through the first electrically controlled production distributor 350 and the third electrically controlled production distributor 370, thereby increasing the seepage resistance of the produced fluid in the buffer tank and achieving the purpose of stabilizing oil and controlling water in the horizontal well without barrier interlayer.

[0030] In another embodiment, a first anti-loss valve 260 is provided at the end of the first tubing string 200 , and a first round plug 270 is provided at the end of the first anti-loss valve 260 .

[0031] In another embodiment, a first safety joint 280 is provided above the first positioning seal 210 in the middle of the first tubing string 200 .

[0032] In another embodiment, a second anti-loss valve 314 is provided at the end of the second tubing string 300 , and a second round plug 315 is provided at the end of the second anti-loss valve 314 .

[0033] In another embodiment, a second safety joint 391 is provided above the second positioning seal 320 in the middle of the second tubing string 300 ; a third safety joint 392 is provided between the first electric control production distributor 350 and the third packer 330 on the second tubing string 300 .

[0034] In another embodiment, it also includes:

[0035] A cable packer 410, which is disposed between the second string 300 and the wall of the horizontal well 2 and is used for the signal cable 380 to pass through;

[0036] The safety valve 420 is disposed on the second tubing string 300 and is located above the cable packer 410 .

[0037] In summary, the present invention provides a compartmented water control process string 1 for a horizontal well without interlayers. A first annulus chemical packer 2501 and a second annulus chemical packer 2502 are injected into the space between the sand screen 100 and the formation of the horizontal well 2 through the injection valve 240 of the first string 200, so as to artificially create a longer buffer compartment and increase the difficulty of formation water entering the wellbore. When the water content of the produced fluid changes / rises rapidly, a chemical plugging agent is injected into the buffer compartment through the second electrically controlled production distributor 360 of the second string 300 to create an artificial barrier near the wellbore. The formation fluid in the buffer compartment can only enter the second string 300 through the first electrically controlled production distributor 350 and the third electrically controlled production distributor 370, so as to increase the seepage resistance of the produced fluid in the buffer compartment and achieve the purpose of stabilizing oil and controlling water in the horizontal well without interlayers.

[0038] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A water control process string for a horizontal well with compartments without interlayers, characterized in that: include: A sand control screen, the front end of which is set in the horizontal well through a top packer; A first tubing string is lowered into the horizontal well, a middle and lower portion of the first tubing string is inserted into the sand control screen, a first positioning seal matched with the top packer is provided in the middle portion of the first tubing string; a first packer and a second packer are provided at intervals in the middle and lower portion of the first tubing string; an injection valve is provided between the first packer and the second packer; The first annulus chemical packer and the second annulus chemical packer are respectively set in the space between the sand control screen and the horizontal well formation, and are respectively injected by the injection valve in sequence and displaced by displacement fluid to between the first packer and the second packer. After the injection is completed, the first string is removed; A second tubing string is lowered into the horizontal well after the first tubing string is removed, and the middle and lower part of the second tubing string is inserted into the sand control screen; a Y-joint is provided at the upper part of the second tubing string, a liquid inlet end on one side of the lower part of the Y-joint is connected to an electric pump unit, and a liquid inlet end on the other side of the lower part of the Y-joint is connected to a bypass pipeline, a plurality of liquid inlet holes are provided at the lower part of the bypass pipeline, and a sliding sleeve is provided at the liquid inlet hole; a second positioning seal matching with the top packer is provided at the middle part of the second tubing string; a third packer and a fourth packer are provided at intervals at the middle and lower part of the second tubing string; a first electrically controlled production distributor is provided between the second positioning seal and the third packer on the second tubing string; a second electrically controlled production distributor is provided between the third packer and the fourth packer on the second tubing string; a third electrically controlled production distributor is provided at the lower part of the fourth packer on the second tubing string; A signal cable is lowered into the horizontal well in parallel with the second string, and the signal cable is electrically connected to the first electric-controlled production distributor, the second electric-controlled production distributor and the third electric-controlled production distributor respectively.

2. The water control process pipe string for horizontal wells with compartments without interlayer according to claim 1 is characterized by: A first anti-leakage valve is provided at the end of the first tubing string, and a first round plug is provided at the end of the first anti-leakage valve.

3. The water control process pipe string for horizontal wells with compartments without interlayers according to claim 1 or 2, characterized in that: A first safety joint is provided above the first positioning seal in the middle of the first pipe string.

4. The water control process string for horizontal wells with compartments without interlayers according to claim 1 or 2, characterized in that: A second anti-leakage valve is provided at the end of the second tubing string, and a second round plug is provided at the end of the second anti-leakage valve.

5. The water control process pipe string for horizontal wells with compartments without interlayers according to claim 4 is characterized by: A second safety joint is provided above the second positioning seal in the middle of the second tubing string; a third safety joint is provided between the first electric-controlled production distributor and the third packer on the second tubing string.

6. The water control process string for horizontal wells with compartments without interlayers according to claim 1 or 2, characterized in that: Also includes: A cable packer, which is arranged between the second string and the wall of the horizontal well and is used for the signal cable to pass through; A safety valve is arranged on the second tubing string and is located above the cable packer.

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