CN108952672B

CN108952672B - Midway testing tubular column of immobile drilling tool and use method

Info

Publication number: CN108952672B
Application number: CN201710351968.2A
Authority: CN
Inventors: 郭秀庭; 宁坤; 刘洋; 强华; 任世举; 翁博; 卜文杰
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2017-05-18
Filing date: 2017-05-18
Publication date: 2022-06-03
Anticipated expiration: 2037-05-18
Also published as: CN108952672A

Abstract

The invention provides a midway testing tubular column of an immobile drilling tool and a using method thereof, wherein the midway testing tubular column of the immobile drilling tool comprises a drilling rod, a kelly bar, a drilling bit, a sliding sleeve, a check valve and a testing tree, wherein the drilling rod comprises an upper part and a lower part; the test tree is suitable for being connected with the upper end of the drill rod; the check valve is arranged on the inner wall of the drill rod close to the lower end; when the drill rod is positioned in the oil-gas well and the sliding sleeve is opened, the annular space between the technical casing pipe of the oil-gas well and the drill rod is communicated with the cavity of the drill rod; when the sliding sleeve is closed, the annular space between the technical casing and the drill rod is not communicated with the cavity of the drill rod. The invention can complete the midway test without taking out the drilling pipe column, washing and killing the well and putting in the test pipe column, thereby reducing the operation time and the pollution of the drilling fluid to the open hole reservoir.

Description

Midway testing tubular column of immobile drilling tool and use method

Technical Field

The invention relates to the technical field of oil and gas exploitation, in particular to a midway testing tubular column of a fixed drilling tool and a using method thereof.

Background

Before oil and gas exploitation, oil testing operation is required. The oil testing operation can be divided into two types: well completion testing and midway testing. The midway test is that in the normal drilling process of the oil-gas well, according to the oil-gas display degree, in order to accurately evaluate the oil-gas layer in time, the normal drilling is interrupted, the test layer carries out pressure measurement, production calculation and sampling, and the temporary well completion test of one-time evaluation of the oil-gas layer is carried out.

The existing midway testing technology needs well killing, well pulling and testing pipe column descending into the well to complete the testing task, namely, the well drilling pipe column is firstly pulled out from the well, and then the well washing and well killing operations are carried out, and then the testing pipe column is descended into the well.

In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:

the existing midway testing technology has the defects of multiple working procedures, long operation time and low efficiency, and causes the open hole reservoir to be soaked by drilling fluid for a long time, thereby causing the pollution of the open hole reservoir before testing.

Disclosure of Invention

In view of the above, the invention provides a midway testing string of a stationary drilling tool and a using method thereof, which can reduce the operation time and the pollution of drilling fluid to an open hole reservoir.

Specifically, the method comprises the following technical scheme:

in one aspect, the present invention provides a halfway test string of a stationary drilling tool, comprising a drill pipe, a kelly bar, a drill bit, a sliding sleeve, a check valve and a test tree, wherein,

the drill rod comprises an upper part and a lower part, the sliding sleeve is connected between the upper part and the lower part of the drill rod, the upper end of the upper part of the drill rod is connected with the kelly bar or the test tree, and the lower end of the lower part of the drill rod is connected with the drill bit; the test tree is suitable for being connected with the upper end of the drill rod; the check valve is arranged on the inner wall of the drill rod at a position close to the lower end;

when the drill rod is positioned in an oil and gas well, the sliding sleeve is opened, and an annular space between a technical casing of the oil and gas well and the drill rod is communicated with a cavity of the drill rod; and closing the sliding sleeve, wherein the annular space between the technical casing and the drill rod is not communicated with the cavity of the drill rod.

Optionally, the midway test string of the immobile drilling tool further comprises a drilling cross, and the drilling cross is sleeved outside the drill rod.

Optionally, the intermediate test string of the immobile drilling tool further comprises a double ram blowout preventer, a lower end of which is connected with an upper end of the drilling cross.

Optionally, the mid-stream test string of the immobile drilling tool further comprises an annular blowout preventer, a lower end of which is connected with an upper end of the dual ram blowout preventer.

Optionally, a lower plug valve is connected between the drill pipe and the kelly.

Optionally, an upper plug valve is connected to the upper end of the kelly.

Optionally, the sliding sleeve includes an outer tube and a liner tube, the outer tube is connected between the upper portion and the lower portion of the drill rod, the outer tube is sleeved on the liner tube, the outer tube and the liner tube are slidably connected, an opening is formed in the outer tube, and when the liner tube is far away from the opening, the sliding sleeve is opened.

Optionally, the halfway test string of the immobile drilling tool further comprises a packer connected between the upper part of the drill pipe and the sliding sleeve, and the lower part of the drill pipe is provided with a ball seat on the inner wall of the upper part of the check valve.

In a second aspect, the present invention provides a method of testing a tubular string partway through a stationary drilling tool as provided in the first aspect, the method comprising:

the method comprises the following steps: when the midway test is needed, stopping the rotation of the drill bit and opening the sliding sleeve;

step two: removing the kelly bar and connecting the test tree to the upper end of the kelly bar;

step three: and injecting clear water or nitrogen into the annular space between the drill pipe and the technical casing so that the clear water or the nitrogen drives the drilling fluid in the drill pipe to be discharged, and the oil and gas flows into the cavity of the drill pipe and is discharged from the test tree.

In a third aspect, the present invention provides another method of testing a string partway through a stationary drilling tool as provided in the first aspect, the method comprising:

the method comprises the following steps: when the midway test is needed, stopping the rotation of the drill bit, throwing a steel ball or a soluble ball into the drill stem, clamping the steel ball or the soluble ball on the ball seat, pressing the drill stem and setting the packer; continuing to press the drill pipe to enable the steel ball or the soluble ball to move to the upper end of the check valve;

step two: opening the sliding sleeve;

step three: removing the kelly bar and connecting the test tree to the upper end of the kelly bar;

step four: and (2) putting a coiled tubing into the drill rod, and injecting clear water or nitrogen into the coiled tubing so that the clear water or nitrogen flowing out of the lower end of the coiled tubing drives the drilling fluid in the annulus between the drill rod and the coiled tubing to be discharged, and then the oil gas flows into the annulus between the drill rod and the coiled tubing and is discharged from the test tree.

The technical scheme provided by the embodiment of the invention has the beneficial effects that:

the invention provides a midway testing pipe column of an immobile drilling tool and a using method thereof, wherein the midway testing pipe column of the immobile drilling tool comprises a drilling rod, a square drilling rod, a drilling bit, a sliding sleeve, a check valve and a testing tree, when oil gas is detected in drilling fluid discharged from an annular space between a technical casing and the drilling rod, the sliding sleeve is opened, the square drilling rod is disassembled, the testing tree is installed on the drilling rod, clean water or nitrogen is injected into the annular space between the technical casing and the drilling rod, so that the clean water or the nitrogen drives the oil gas to enter a cavity of the sliding sleeve and further to be discharged from a liquid outlet of the testing tree through the cavity of the drilling rod. The method can complete the midway test without taking out the drilling string from the well, performing well washing and killing operation and putting in the test string, thereby reducing the operation time, shortening the time of the barefoot reservoir soaked by the drilling fluid and reducing the pollution of the drilling fluid to the barefoot reservoir.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic illustration of a halfway through test string of a stationary drilling tool without a packer in a hydrocarbon well in one embodiment of the present invention;

FIG. 2 is a schematic illustration of a halfway through test string of a packer-equipped immobile drilling tool in a hydrocarbon well in an embodiment of the present invention;

FIG. 3 is a front view of a test tree in accordance with an embodiment of the present invention;

FIG. 4 is a side view of a test tree in accordance with an embodiment of the present invention.

The reference numerals in the figures are respectively:

1. an upper plug valve; 2. a kelly bar; 3. a lower plug valve; 4. an annular blowout preventer; 5. a dual ram blowout preventer; 6. drilling a four-way joint; 7. a surface casing; 8. a drill stem; 9. a technical sleeve; 10. a sliding sleeve; 11. a packer; 12. a check valve; 13. a drill bit; 14. lifting the short section; 15. blowing out a manifold; 16. a kill manifold; 17. a suction valve; 18. a flow wing valve; 19. a kill wing valve; 20. a main valve; 21. and (5) rotating the short section.

Detailed Description

In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.

Example one

The embodiment provides a midway testing string of a stationary drilling tool, which comprises a drill stem 8, a kelly 2, a drill bit 13, a sliding sleeve 10 and a testing tree as shown in fig. 1 and 2, wherein the drill stem 8 comprises an upper part and a lower part, the sliding sleeve 10 is connected between the upper part and the lower part of the drill stem 8, the upper end of the upper part of the drill stem 8 is connected with the kelly 2 or the testing tree, and the lower end of the lower part of the drill stem 8 is connected with the drill bit 13; the drill rod 8 is provided with a check valve 12 near the lower end; when the drill rod 8 is positioned in an oil and gas well and the sliding sleeve 10 is opened, the annular space between the technical casing 9 and the drill rod 8 is communicated with the cavity of the drill rod 8; when the sliding sleeve 10 is closed, the annular space between the technical casing 9 and the drill rod 8 is not communicated with the cavity of the drill rod 8.

Use the midway test tubular column of the motionless drilling tool that this embodiment provided, when the well drilling, connect the kelly 2 in the upper end of drilling rod 8 upper portion, when carrying out midway test sampling, open sliding sleeve 10, dismantle kelly 2 and install the test tree on drilling rod 8, inject clear water or nitrogen gas into the annular space between technical casing 9 and drilling rod 8, and make clear water or nitrogen gas drive about the drilling fluid in the drilling rod 8 and discharge in getting into the cavity of drilling rod 8, and then oil gas gets into the cavity of drilling rod 8 and discharges from the test tree. The midway testing pipe column of the immobile drilling tool provided by the embodiment can realize midway testing without taking out the drilling pipe column from the well, performing well washing and killing operation and putting in the testing pipe column, so that the operation time is reduced, the time of soaking the open hole reservoir by the drilling fluid is shortened, and the pollution of the drilling fluid to the open hole reservoir is reduced.

In this embodiment, an open hole reservoir is arranged below the technical casing 9 and around the drill bit 13, and the open hole reservoir is in direct contact with the drilling fluid in the drilling and midway testing processes. Therefore, the operation time for testing the pipe column in midway of the immobile drilling tool is short, and the time for soaking the open hole reservoir by the drilling fluid is short, so that the pollution of the drilling fluid to the open hole reservoir can be reduced.

In this embodiment, as shown in fig. 3 and 4, the test tree includes a lifting sub 14, a blowout manifold 15, a kill manifold 16, a suction valve 17, a flow wing valve 18, a kill wing valve 19, a main valve 20, and a swivel sub 21. Wherein, the lifting sub 14 is used for hanging the test tree on external equipment; the blowout manifold 15 is used for blowout of the fluid in the wellbore; the kill manifold 16 is used to circulate kill fluid; the suction valve 17 is used for lowering a wireline tool into the wellbore; the movable wing valve 18 is a hydraulic control fault-free normally closed valve, is pressurized and opened through a control panel, and is decompressed and quickly closed in emergency; the kill-job wing valve 19 is connected with the pump truck during the midway test, is used for killing the well in emergency, and is used for testing the pressure of ground equipment before the test; the main valve 20 is used for isolating the oil well from the surface flow; swivel sub 21 is used to rotate a lower tubular string, such as setting a packer, etc. In this embodiment, the oil and gas may be vented through the blow-off manifold 15.

As an improvement of this embodiment, as shown in fig. 1 and 2, the midway testing string of the immobile drilling tool further comprises a drilling cross 6, the drilling cross 6 is sleeved outside the drill pipe 8, and the lower end of the drilling cross is connected with the upper ends of the technical casing 9 and the surface casing 7. In this way, the drilling fluid which flows out of the annular space between the technical casing 9 and the drill rod 8 during drilling can flow out through the openings in the side of the drilling cross 6.

As a modification of the present embodiment, as shown in fig. 1 and 2, the middle test string of the immobile drilling tool further includes a double ram blowout preventer 5, and the lower end of the double ram blowout preventer 5 is connected to the upper end of the drilling cross 6. In the drilling and midway testing process, the double-ram blowout preventer 5 is in a closed state, and an annular space between the drilling cross 6 and the drill rod 8 is plugged, so that overflowing and well kick are prevented.

As a modification of the present embodiment, as shown in fig. 1 and 2, the halfway test string of the immobile drilling tool further includes an annular blowout preventer 4, and the lower end of the annular blowout preventer 4 is connected to the upper end of a double ram blowout preventer 5. In the drilling and midway testing process, the annular blowout preventer 4 is in a closed state, so that the operation process can be ensured to be safer.

As a modification of this embodiment, as shown in figures 1 and 2, a lower plug valve 3 is connected between the drill pipe 8 and the kelly 2. Both ends of the lower plug valve 3 may be threadedly connected to the drill pipe 8 and kelly 2. In the process of drilling and midway oil-gas testing sampling, the lower plug valve 3 is in an open state. When the kelly bar 2 is dismantled, the test tree is installed and oil and gas sampling is completed, the lower plug valve 3 is closed, so that well shut-in is realized, and overflow and well kick are avoided.

As a modification of the present embodiment, as shown in fig. 1 and 2, an upper plug valve 1 is connected to the upper end of a kelly 2. In the process of drilling and midway oil-gas sampling test, the upper plug valve 1 is in an open state. When an overflow, kick, occurs, upper plug valve 1 may be closed, preventing formation fluids from being blown out along drill pipe 8 and kelly bit 2. In well control operation, when a water hose and a high-pressure manifold connected with a drilling tool are damaged, the upper plug valve 1 is closed, and safe replacement or maintenance can be carried out.

As a modification of this embodiment, the sliding sleeve 10 comprises an outer tube and a liner tube, the outer tube being connected between the upper and lower sections of the drill rod 8, the outer tube being sleeved over the liner tube, the outer tube and the liner tube being slidably connected, the outer tube being provided with an opening, the sliding sleeve 10 being opened when the liner tube is removed from the opening. When sliding sleeve 10 is opened to needs, go into the drilling rod 8 through wire rope with fishing head down in, make fishing head card in the bushing, upwards draw wire rope, make fishing head drive bushing upward movement and keep away from the trompil on the outer tube to the annular space between technical sleeve 9 and the drilling rod 8 passes through the trompil on the outer tube and the cavity intercommunication of sliding sleeve 10, then with wire rope and fishing head take out can.

As a modification of the embodiment, as shown in FIG. 2, the midway testing string of the immobile drilling tool further comprises a packer 11, the packer 11 is connected between the upper part of the drill pipe 8 and the sliding sleeve 10, and the inner wall of the lower part of the drill pipe is provided with a ball seat. For oil and gas wells with high pressure, high yield and need of protective technical casing, a test string with a packer can be adopted for midway testing. And (3) putting steel balls into the drill rod 8, clamping the steel balls on the ball seats, pressing the drill rod 8, expanding the rubber sleeve of the packer 10 to complete setting, and plugging the annular space between the technical casing 9 and the drill rod 8, so that liquid in the well can be prevented from being sprayed out from the annular space.

As shown in fig. 1 and 2, when drilling and performing an intermediate test, the upper plug valve 1, the kelly bar 2, the lower plug valve 3, the annular blowout preventer 4, the double ram blowout preventer 5, and the drilling cross 6 are located on the ground, and the surface casing 7, the drill pipe 8, the technical casing 9, the sliding sleeve 10, the packer 11, the check valve 12, and the drill bit 13 are located below the ground.

Example two

The embodiment provides a method for testing a pipe string in the midway of a static drilling tool shown in the first embodiment and shown in FIG. 1, which comprises the following steps:

specifically, when detecting to have oil gas in the drilling fluid of annular space discharge between drilling rod and the technical casing or judge according to the experience that needs carry out the test midway, go into down to the drilling rod in and be connected with the steel wire of fishing head to make fishing head card in the bushing pipe of sliding sleeve, upwards stimulate wire rope, make fishing head drive the bushing pipe upward movement of sliding sleeve, thereby the sliding sleeve is opened, and the cavity of sliding sleeve passes through the annular space intercommunication between trompil and technical casing and the drilling rod on the outer tube.

Step two: removing the kelly bar, and connecting the test tree to the upper end of the kelly bar;

in this embodiment, the test tree may be attached to the upper end of the drill pipe by a lower plug valve.

Step three: and injecting clear water or nitrogen into the annular space between the drill pipe and the technical casing pipe, so that the clear water or the nitrogen drives the drilling fluid in the drill pipe to be discharged out of the cavity of the drill pipe, and the oil gas flows into the cavity of the drill pipe and is discharged from the blowout manifold of the test tree.

And after the oil and gas sampling is finished, closing the lower plug valve to close the well.

By using the method for testing the pipe column halfway of the immobile drilling tool, when halfway testing is performed, the oil gas sampling can be completed by completing the halfway testing without taking out the drilling pipe column from the well and then putting in the testing pipe column, so that the operation time is reduced, the soaking time of an open hole reservoir in drilling fluid is shortened, and the pollution degree of the drilling fluid to the open hole reservoir is reduced.

EXAMPLE III

The present embodiment provides a method for testing a tubular string halfway through a stationary drilling tool as shown in fig. 2, using the first embodiment, the method comprising:

the method comprises the following steps: when the midway test is needed, stopping the rotation of the drill bit, throwing a steel ball or a soluble ball into the drill rod, clamping the steel ball or the soluble ball on the ball seat, and pressing the drill rod to set the packer; continuously pressing the drill rod to enable the steel ball or the soluble ball to move to the upper end of the check valve;

and stopping drilling and starting testing when detecting that oil gas exists in the drilling fluid discharged from the annular space between the drill pipe and the technical casing or judging that the midway testing is required according to experience.

Step two: opening the sliding sleeve;

specifically, go into the steel wire that is connected with the fishing head down in to the drilling rod to make fishing head card in the bushing pipe of sliding sleeve, upwards stimulate wire rope, make fishing head drive the bushing pipe upward movement of sliding sleeve, thereby the sliding sleeve is opened, and the cavity of sliding sleeve passes through the trompil on the outer tube and the annular space intercommunication between technical casing and the drilling rod.

Step three: removing the kelly bar, and connecting the test tree to the upper end of the kelly bar;

Step four: and (2) putting a coiled tubing into the drill rod, and injecting clear water or nitrogen into the coiled tubing so that clear water or nitrogen flowing out from the lower end of the coiled tubing drives drilling fluid in an annular space between the drill rod and the coiled tubing to be discharged, and then oil gas flows into an annular space between the drill rod and the coiled tubing and is discharged from the test tree.

And when the oil gas sampling is completed, closing the lower plug valve to realize well closing.

The method for testing the pipe column halfway of the immobile drilling tool can be used for oil and gas wells with high pressure, high yield and technical casing protection, overflow and well kick are prevented, and during halfway testing, the oil and gas sampling can be completed without taking out the drilling pipe column from the well and then putting the testing pipe column in the well, so that the operation time is shortened, the soaking time of an open hole reservoir in drilling fluid is shortened, and the pollution degree of the drilling fluid to the open hole reservoir is reduced.

The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A midway testing pipe column of a fixed drilling tool is characterized by comprising a drill rod, a kelly bar, a drill bit, a sliding sleeve, a check valve, a testing tree and a packer, wherein,

the drill rod comprises an upper part and a lower part, the sliding sleeve is connected between the upper part and the lower part of the drill rod, the upper end of the upper part of the drill rod is connected with the kelly bar or the test tree, and the lower end of the lower part of the drill rod is connected with the drill bit; the sliding sleeve comprises an outer pipe and a liner pipe, the outer pipe is connected between the upper part and the lower part of the drill rod, the outer pipe is sleeved on the liner pipe, the outer pipe is slidably connected with the liner pipe, and an opening is formed in the outer pipe; the test tree is suitable for being connected with the upper end of the drill rod; the check valve is arranged on the inner wall of the drill rod at a position close to the lower end; the upper end of the kelly bar is connected with an upper plug valve, and the upper plug valve is used for being opened in the drilling and midway oil and gas testing sampling processes and being closed when overflow and well kick occur; a lower plug valve is connected between the drill stem and the kelly stem, and is used for opening in the drilling and midway oil-gas testing sampling processes and closing when the kelly stem is detached, the test tree is installed and the oil-gas sampling is completed; two ends of the lower plug valve are respectively connected with the drill rod and the kelly through threads; the packer is connected between the upper part of the drill pipe and the sliding sleeve, the lower part of the drill pipe is provided with a ball seat on the inner wall of the upper part of the check valve, when a soluble ball is thrown into the drill pipe, the ball seat is used for clamping the soluble ball, and after the drill pipe is pressed, the packer is set;

opening the sliding sleeve when the drill pipe is located in a hydrocarbon well, wherein the opening the sliding sleeve comprises: the fishing head is lowered into the drill rod through a steel wire rope, the fishing head is clamped in the lining pipe, the steel wire rope is pulled upwards, the fishing head drives the lining pipe to move upwards and be away from the opening, an annular space between a technical casing of an oil-gas well and the drill rod is communicated with a cavity of the drill rod, and the steel wire rope and the fishing head are taken out; closing the sliding sleeve, wherein the annular space between the technical casing and the drill rod is not communicated with the cavity of the drill rod;

wherein the test tree comprises a lifting sub (14), a blowout manifold (15), a kill manifold (16), a suction valve (17), a flow wing valve (18), a kill wing valve (19), a main valve (20) and a rotary sub (21), the lifting sub (14) is used for hanging the test tree on external equipment; the blowout manifold (15) is used for blowing fluid in the well; the kill manifold (16) is used for circulating kill fluid; the suction valve (17) is used for lowering a cable tool into the well; the flowing wing valve (18) is pressurized and opened through a control panel, and pressure is released to quickly close the well in emergency; the kill-job wing valve (19) is connected with the pump truck during midway test, is used for killing a well in emergency, and is used for testing the pressure of ground equipment before testing; the main valve (20) is used for isolating an oil well from a ground flow, the rotary nipple (21) is used for rotating a lower pipe column, and oil gas is discharged through the blowout manifold (15).

2. The midway test string of immobile drilling tool of claim 1, further comprising a drilling spool that is sleeved outside the drill pipe.

3. The midway test string of immobile drilling tools of claim 2, further comprising a double ram blowout preventer, the lower end of which is connected with the upper end of the drilling cross.

4. The midway test string of immobile drilling tools of claim 3, further comprising an annular blowout preventer, the lower end of which is connected with the upper end of the double ram blowout preventer.

5. A method of testing a string partway through a stationary drilling tool according to any one of claims 1 to 4, the method comprising:

the method comprises the following steps: when the midway test is needed, stopping the rotation of the drill bit, throwing the soluble ball into the drill pipe, clamping the soluble ball on the ball seat, pressing the drill pipe and setting the packer; a steel wire rope connected with a fishing head is put into the drill rod, the fishing head is clamped in the lining pipe of the sliding sleeve, the steel wire rope is pulled upwards, the fishing head drives the lining pipe to move upwards, the sliding sleeve is opened, and a cavity of the sliding sleeve is communicated with an annular space between the technical casing and the drill rod through an opening in the outer pipe;

6. A method of testing a string partway through a stationary drilling tool according to any one of claims 1 to 4, the method comprising:

the method comprises the following steps: after the packer is set, continuously pressing the drill pipe to enable the soluble ball to move to the upper end of the check valve;

step two: opening the sliding sleeve;