CN112253085B - Method for determining length of well completion string - Google Patents
Method for determining length of well completion string Download PDFInfo
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- CN112253085B CN112253085B CN202011062438.4A CN202011062438A CN112253085B CN 112253085 B CN112253085 B CN 112253085B CN 202011062438 A CN202011062438 A CN 202011062438A CN 112253085 B CN112253085 B CN 112253085B
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- completion string
- string
- completion
- distance
- reinsertion
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
Abstract
The disclosure provides a length determining method of a well completion pipe string, and belongs to the field of oil and gas well completion technology. The length determining method comprises the following steps: lowering the completion string into the production casing to a first depth using the drill pipe; injecting a fluid into the annulus between the hanging string and the production casing to circulate the fluid in the annulus and the completion string; continuing to lower the completion string and monitoring the fluid pressure in the annular space in real time; stopping lowering the completion string when the fluid pressure within the annular space reflects that the inserted end of the completion string is in contact with the top of the reinsertion cartridge; acquiring a second distance from the insertion end of the completion string to the wellhead when the insertion end of the completion string contacts the top of the reinsertion barrel; based on the second distance, a length of the completion string is determined. According to the method, the well completion pipe string is not required to be inserted into the back insertion barrel, the possibility of damage to the sealing ring outside the well completion pipe string is reduced, the sealing effect between the well completion pipe string and the back insertion barrel is ensured, and the well completion quality is improved.
Description
Technical Field
The present disclosure relates to the field of oil and gas well completion processes, and in particular to a method for determining the length of a completion string.
Background
The well completion refers to a process that after an open hole well is drilled to a designed well depth, a bottom hole and an oil layer are communicated with each other in a certain structure. The well completion is the last important link of drilling work, is the beginning of oil extraction engineering, and is closely connected with oil extraction, water injection and development of the whole oil and gas field in the future. Therefore, the quality of the completion of the oil and gas well directly affects the productivity and the economic life of the oil and gas well, and even the whole oil field can be reasonably developed.
In the related art, when performing a well completion operation, a certain length of a well completion string is usually run into the well by using a drill pipe, and then is inserted into a downhole reinsertion cylinder, and then a target length of the well completion string required for being inserted into the reinsertion cylinder from a wellhead is determined according to the running depth of the drill pipe and the well completion string. And then, the length of the well completion pipe string is matched according to the determined target length, so that the length of the well completion pipe string reaches the target length. Finally, the well completion pipe string after the length is matched is inserted into the back insertion barrel, so that the well completion operation is completed. The completion pipe string is inserted to the outside of one end of the back insertion barrel and is provided with a plurality of sealing rings, so that the completion pipe string can be in sealing fit with the back insertion barrel, and the subsequent oil extraction gas operation is conveniently carried out through the completion pipe string and the back insertion barrel.
However, when determining the length of the completion string, the completion string needs to be inserted into the reinsertion barrel, which may cause damage to a sealing ring outside the completion string, and affect the sealing effect between the completion string and the reinsertion barrel after the completion string is reinserted into the reinsertion barrel, thereby affecting the completion quality and the productivity of the oil and gas well.
Disclosure of Invention
The embodiment of the disclosure provides a length determining method of a well completion pipe string, which does not need to insert the well completion pipe string into a back-insertion barrel, reduces the possibility of damage of a sealing ring outside the well completion pipe string, ensures the sealing effect between the well completion pipe string and the back-insertion barrel, and improves the well completion quality. The technical scheme is as follows:
the embodiment of the disclosure provides a length determining method of a completion pipe string, the completion pipe string is used for being inserted back into an insertion back barrel in a production casing, the insertion back barrel is positioned at the top of a suspension pipe string, the suspension pipe string is positioned in the production casing in a well, and a suspension packer is arranged between the suspension pipe string and the production casing, and the length determining method is characterized by comprising the following steps:
lowering the completion string into the production casing to a first depth using a drill pipe, the first depth being a first distance from an insertion end of the completion string to a wellhead;
injecting a fluid into an annular space between the hanging string and the production casing, circulating the fluid within the annular space and the completion string;
continuing to lower the completion string and monitoring the fluid pressure in the annular space in real time;
stopping lowering the completion string when the fluid pressure within the annular space reflects that the insertion end of the completion string is in contact with the top of the reinsertion barrel;
acquiring a second distance from the insertion end of the completion string to a wellhead when the insertion end of the completion string is in contact with the top of the reinsertion barrel;
and determining the length of the completion string according to the second distance.
Optionally, stopping lowering the completion string when the fluid pressure within the annular space reflects that the insertion end of the completion string is in contact with the top of the reinsertion cartridge, comprising:
and when the liquid pressure in the annular space rises by a set amplitude within a set time and continuously rises, judging that the insertion end of the completion string is contacted with the top of the plug-in cylinder, and stopping lowering the completion string.
Optionally, the set time is 5-10 s, and the set amplitude is 200% -300%.
Optionally, the injecting a fluid into the annulus between the hanging string and the production casing to circulate the fluid within the annulus and the completion string comprises:
and injecting clear water into an annular space between the suspension pipe column and the production casing pipe by adopting a fracturing truck at a first pressure and a first displacement, so that the liquid circularly flows in the annular space and the back-inserted cylinder until the pump pressure of the fracturing truck is stabilized at a second pressure and the displacement is kept unchanged.
Optionally, the first pressure is 1-1.5 MPa, and the first displacement is 0.1-0.5 m 3 /min。
Optionally, the running the completion string into the production casing to a first depth with a drill pipe comprises:
obtaining the theoretical distance from the top of the back-inserted cylinder to a wellhead;
and lowering the completion pipe string into the production casing to the first depth by adopting a drill rod according to the theoretical distance, wherein the difference value between the first depth and the theoretical distance is a set value, and the set value is 5-10 m.
Optionally, the obtaining the theoretical distance from the top of the back-inserted cylinder to the wellhead includes:
recording the running depth of the drill rod when the suspension pipe column is run into the production casing by adopting the drill rod;
and determining the running depth of the drill rod as the theoretical distance from the top of the back-inserted cylinder to the wellhead.
Optionally, the obtaining a second distance of the insertion end of the completion string from the wellhead when the insertion end of the completion string is in contact with the top of the reinsertion barrel comprises:
when the well completion string is lowered into the production casing to a first depth by a drill pipe, making a first mark at a first position of the drill pipe which is flush with the wellhead surface;
making a second mark in a second position of the drill pipe flush with the wellhead surface when the fluid pressure in the annular space reflects that the insertion end of the completion string is in contact with the top of the reinsertion cartridge;
the second distance is determined based on the first depth and the distance between the first mark and the second mark.
Optionally, the obtaining a second distance of the insertion end of the completion string from the wellhead when the insertion end of the completion string is in contact with the top of the reinsertion barrel comprises:
making a second mark in a second position of the drill pipe flush with the wellhead surface when the fluid pressure in the annular space reflects that the insertion end of the completion string is in contact with the top of the reinsertion cartridge;
determining that the distance from the second marker to the insertion end of the completion string is the second distance.
Optionally, the determining the length of the completion string according to the second distance includes:
acquiring the depth of the back-inserting cylinder;
and determining the sum of the second distance and the depth of the reinsertion barrel as the length of the completion string.
The technical scheme provided by the embodiment of the disclosure has the beneficial effects that:
by running the completion string into the production casing to a first depth using the drill pipe, the completion string is spaced a distance from the top of the reinsertion barrel and the internal bore of the completion string is able to communicate with the annular space between the hanging string and the production casing. Fluid is then injected into the annular space so that the fluid can circulate within the annular space and completion string. The completion string is then run into the production casing and the fluid pressure in the annulus monitored in real time. When the insertion end of the completion string contacts the top of the reinsertion barrel, the internal bore of the completion string is not in communication with the annular space, and fluid can no longer circulate in the annular space and the internal bore of the completion string, and fluid pressure in the annular space can rise. Thus, by monitoring the change in fluid pressure within the annular space, it is determined whether the inserted end of the completion string is in contact with the top of the reinsertion cartridge. When the fluid pressure in the annular space reflects that the inserted end of the completion string is in contact with the top of the reinsertion barrel, the completion string is stopped from being lowered, and a second distance from the inserted end of the completion string to the wellhead at that time is obtained. And finally, determining the length of the well string according to the second distance. According to the method, a well completion pipe string is not required to be inserted into the reinsertion barrel, the possibility of damage to a sealing ring outside the well completion pipe string is reduced, the sealing effect between the well completion pipe string and the reinsertion barrel when the well completion pipe string is reinserted into the reinsertion barrel is guaranteed, the well completion quality is improved, and the production capacity of an oil and gas well is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for 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 disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a method flow diagram of a method of determining the length of a completion string provided by an embodiment of the present disclosure;
FIG. 2 is a method flow diagram of another method of determining the length of a completion string provided by embodiments of the present disclosure;
FIG. 3 is a run-in schematic of a suspended string provided by an embodiment of the present disclosure;
FIG. 4 is a schematic illustration of a completion string run into a production casing to a first depth provided by an embodiment of the present disclosure;
fig. 5 is a schematic illustration of an insertion end of a completion string in contact with a top of a pull-back barrel provided by an embodiment of the present disclosure.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.
In the related art, when determining the length of the completion string, the completion string with the initial length is usually connected with the weight hanging meter, the completion string with the initial length is put into the well by adopting a drill rod, and the contact between the completion string and the insertion tube is judged by observing the number of the weight hanging meter. When the completion string is in contact with the pull-back casing, the number of suspended weight indicators will be significantly reduced.
However, the manner in which the completion string is determined to be in contact with the pull-back casing is inaccurate by virtue of the indication of the sling weight meter. On the one hand, since the reinsertion cylinder is typically several kilometers from the wellhead, when the completion string is run downhole, the required completion string is longer in length and heavier in weight, and even if the completion string is supported by contact with the reinsertion cylinder, the support force is transferred to the surface at a suspended weight scale at a slower rate, and the transfer of force is insensitive. When the indication of the suspended weight gauge changes, the completion string may already be inserted into the reinsertion barrel, resulting in inaccurate length of the final completion string. On the other hand, even if the indication of the suspended weight gauge becomes significantly smaller, it is possible that the completion string is only blocked during running and is not in contact with the back-insertion barrel, and therefore, the manner of determining whether the completion string is in contact with the back-insertion barrel by means of the indication of the suspended weight gauge is inaccurate.
In order to ensure the accuracy of the determined target length of the completion string, further downward pressure is typically applied to the completion string to fully insert the completion string into the reinsertion cartridge, typically when the indication of the sling weight indicator is significantly reduced and tends to stabilize, indicating that the completion string is fully inserted into the reinsertion cartridge. And then marking the position of the drill rod which is flush with the surface of the wellhead, taking out the well completion pipe string and the drill rod together, and determining the target length of the required well completion pipe string according to the length from the marking position to the insertion end of the well completion pipe string. And then the completion pipe string is matched and grown to the target length, and the completion pipe string with the required length can be obtained. And finally, the well completion pipe string after the length is matched is inserted back into the back insertion barrel by adopting a drill rod, so that the connection between the well completion pipe string and the back insertion barrel can be completed.
However, in the process of determining the target length of the completion string, the completion string needs to be fully inserted into the reinsertion barrel, which may cause damage to a sealing ring outside the completion string, affect the sealing effect between the completion string and the reinsertion barrel after the completion string is reinserted into the reinsertion barrel, and further affect the completion quality and the production capacity of the oil and gas well.
To solve the above technical problem, an embodiment of the present disclosure provides a method for determining a length of a completion string, and fig. 1 is a flowchart of a method for determining a length of a completion string according to an embodiment of the present disclosure, as shown in fig. 1, where the method for determining a length includes:
step 101, a completion string is run into the production casing to a first depth using a drill pipe.
Wherein the first depth is a distance from an insertion end of the completion string to the wellhead.
Step 102, injecting a liquid into the annular space between the suspension string and the production casing, and circulating the liquid in the annular space and the completion string.
The well completion pipe column is used for being inserted back into an inserting cylinder in the production casing, the inserting cylinder is located at the top of the hanging pipe column, the hanging pipe column is located in the production casing in the well, and a hanging packer is arranged between the hanging pipe column and the production casing. The suspended packer can play a sealing role, and after liquid is injected into the annular space between the suspended pipe column and the production casing, the liquid does not continue to flow downwards under the action of the suspended packer, but only flows above the suspended packer.
Step 103, continuing to lower the well completion string and monitoring the liquid pressure in the annular space in real time.
Step 104, stopping lowering the completion string when the fluid pressure in the annular space reflects that the inserted end of the completion string is in contact with the top of the reinsertion cartridge.
Step 105, obtaining a second distance from the insertion end of the completion string to the wellhead when the insertion end of the completion string is in contact with the top of the reinsertion cartridge.
And 106, determining the length of the well completion string according to the second distance.
The disclosed embodiments enable a completion string to be spaced a distance from the top of the reinsertion cartridge by running the completion string into the production casing to a first depth using a drill pipe, and the internal bore of the completion string can communicate with the annular space between the hanging string and the production casing. Fluid is then injected into the annular space so that the fluid can circulate within the annular space and completion string. The completion string is then run into the production casing and the fluid pressure in the annulus monitored in real time. When the insertion end of the completion string contacts the top of the reinsertion barrel, the internal bore of the completion string is not in communication with the annular space, and fluid can no longer circulate in the annular space and the internal bore of the completion string, and fluid pressure in the annular space can rise. Thus, by monitoring the change in fluid pressure within the annular space, it is determined whether the inserted end of the completion string is in contact with the top of the reinsertion cartridge. When the fluid pressure in the annular space reflects that the inserted end of the completion string is in contact with the top of the reinsertion barrel, the completion string is stopped from being lowered, and a second distance from the inserted end of the completion string to the wellhead at that time is obtained. And finally, determining the length of the well string according to the second distance. According to the method, a well completion pipe string is not required to be inserted into the reinsertion barrel, the possibility of damage to a sealing ring outside the well completion pipe string is reduced, the sealing effect between the well completion pipe string and the reinsertion barrel when the well completion pipe string is reinserted into the reinsertion barrel is guaranteed, the well completion quality is improved, and the production capacity of an oil and gas well is guaranteed.
FIG. 2 is a method flow diagram of another method for determining the length of a completion string provided by an embodiment of the present disclosure, as shown in FIG. 2, the method comprising:
step 201, obtaining a theoretical distance from the top of the back-inserted cylinder to a wellhead.
Illustratively, step 201 may include:
recording the running depth of a drill rod when the suspension pipe column is run into the production casing by the drill rod;
and determining the running depth of the drill rod as the theoretical distance from the top of the back-inserted cylinder to the wellhead.
Fig. 3 is a schematic running view of a suspension string provided in an embodiment of the disclosure, as shown in fig. 3, a suspension string 310 is connected to a drill pipe 320, a jack-back 311 is located at the top of the suspension string 310, the suspension string 310 is located in a production casing 300 in a well, and a suspension packer 330 is provided between the suspension string 310 and the production casing 300.
Optionally, after the suspension string 310 is lowered to the set position, a mark may be made at the position of the drill pipe 320 flush with the wellhead, then after the drill pipe 320 is taken out, the distance from the end of the drill pipe 320 connected to the suspension string 310 to the mark is measured, and recording is performed, so as to obtain the theoretical distance H1 from the top of the jack-in-line 311 to the wellhead.
Because drill pipe 320 is typically several kilometers in length and heavy in weight, drill pipe 320 may be stretched under its own weight during removal of drill pipe 320. Thus, the measured distance from the end of the drill pipe 320 connected to the hanging string 310 to the mark may be different from the actual distance from the top of the back-insertion barrel to the wellhead, and thus, H1 obtained in this step is the theoretical distance from the top of the back-insertion barrel 311 to the wellhead, and not the actual distance.
Step 202, a completion string is run into the production casing to a first depth by using a drill pipe according to the theoretical distance.
The difference between the first depth and the theoretical distance is set value a, and the set value a is 5-10 m. That is, the first depth is H1-a. The first depth is the distance from the insertion end of the completion string to the wellhead,
fig. 4 is a schematic diagram of a completion string according to an embodiment of the present disclosure running into a production casing to a first depth, as shown in fig. 4, where the distance from the insertion end of the completion string 410 to the wellhead is H1-a, and the theoretical distance from the insertion end of the completion string 410 to the top of the insertion barrel 311 is a.
In the presently disclosed embodiment, h1=4000 m, a=10m, i.e., the first depth is 3990m, and completion string 410 is run into the production casing to a depth of 3990m, stopping the run.
Step 203, injecting a fluid into the annular space between the hanging string and the production casing, and circulating the fluid in the annular space and the completion string.
Referring to FIG. 4, the suspended packer 330 may now act as a seal. After injecting the fluid into the annular space S between the suspended string 310 and the production casing 300, the fluid does not continue to flow downward under the influence of the suspended packer 330, but only flows above the suspended packer 330.
Illustratively, step 203 may include:
injecting clear water into an annular space between the suspension pipe column and the production sleeve by adopting the fracturing truck at first pressure and first displacement, so that liquid circularly flows in the annular space and the back-inserted cylinder until the pump pressure of the fracturing truck is stabilized at second pressure and the displacement is kept unchanged.
In order to ensure the sealing effect of the suspended packer, when the fracturing truck is used for injecting water into the annular space S between the suspended tubular column 310 and the production casing 300, clean water needs to be injected by adopting a low pump pressure and a small discharge capacity.
Optionally, the first pressure is 1-1.5 MPa, and the first displacement is 0.1-0.5 m 3 And/min. The sealing effect of the suspended packer can be ensured at this time.
In the embodiment of the disclosure, the first pressure is 1.3MPa and the displacement is 0.15m 3 And/min, wherein the second pressure is 1.5MPa, namely the pumping pressure of the fracturing truck is stabilized at 1.5MPa.
Step 204, continuing to lower the completion string and monitoring the fluid pressure in the annular space in real time.
In the disclosed embodiments, the fluid pressure within the annular space S may be monitored in real time by an electronic pressure gauge on the fracturing truck.
Step 205, stopping lowering the completion string when the fluid pressure within the annular space reflects that the inserted end of the completion string is in contact with the top of the reinsertion cartridge.
Illustratively, step 205 may include:
when the liquid pressure in the annular space rises by a set amplitude within a set time and continuously rises, the insertion end of the completion string is judged to be in contact with the top of the reinsertion cylinder, and the completion string is stopped from being lowered.
Fig. 5 is a schematic illustration of an insertion end of a completion string in contact with a top of a reinsertion cartridge, as shown in fig. 5, where an insertion end of completion string 410 is further coaxially coupled to a lead-in section 411, as provided by an embodiment of the present disclosure. The cross-sectional area of lead-in section 411 gradually decreases from the end of lead-in section 411 connected to the insertion end of completion string 410 to the end distal from the insertion end of completion string 410, so that lead-in section 411 is inserted into insertion barrel 311, thereby functioning as a guide.
At this time, the insertion end of completion string 410 is in contact with the top of reinsertion cartridge 311, and lead-in section 411 is located in reinsertion cartridge 311. A sealing structure 410a on the outer wall of completion string 410 is located on top of reinsertion cartridge 311, just sealing between the outer wall of completion string 410 and the inner wall of reinsertion cartridge 311. The inner bore of completion string 410 is not in communication with annulus S and fluid is no longer circulated through annulus S and the inner bore of completion string 410 and the fluid pressure within annulus S may rise in a short period of time.
In the embodiment of the disclosure, the set time is 5-10 s, and the set amplitude is 200% -300%.
Wherein the rising amplitude of the liquid pressure in the annular space refers to the amplitude of the rising relative to the second pressure.
For example, in embodiments of the present disclosure, when the liquid pressure within the annular space rises from the second pressure of 1.5MPa to 4.5MPa within 5 seconds, i.e., the rise is (4.5 MPa-1.5 MPa)/1.5 MPa = 200%.
Step 206, obtaining a second distance from the insertion end of the completion string to the wellhead when the insertion end of the completion string is in contact with the top of the reinsertion cartridge.
In one implementation of the disclosed embodiments, step 206 may include:
in a first step, a first mark is made on a drill pipe at a first location flush with the wellhead surface when the completion string is run into the production casing to a first depth using the drill pipe.
Referring to FIG. 4, completion string 410 is run into the production casing to a first depth H1-a, and drill pipe 420 has a first mark A1 thereon. At this point, the drill pipe 420 is lowered by 35m, i.e. H A1 ＝35m。
And a second step of making a second mark on the drill pipe at a second position flush with the wellhead surface when the fluid pressure in the annular space reflects that the inserted end of the completion string is in contact with the top of the reinsertion cartridge.
Referring to fig. 5, the insertion end of completion string 410 is in contact with the top of back-insertion barrel 311 and drill pipe 420 has a second indicia A2 thereon. At this point, the drill pipe 420 is lowered 39m, i.e. H A2 ＝39m。
And thirdly, determining a second distance according to the first depth and the distance between the first mark and the second mark.
Referring to fig. 5, the distance between the first mark A1 to the second mark A2 is Δh at this time. That is, completion string 410 continues to move downward by ΔH before the insertion end of completion string 410 contacts the top of reinsertion barrel 311.
The sum of the first depth H1-a and the distance Δh from the first mark to the second mark, i.e., the second distance H2, can be expressed by the following formula:
H2＝(H1-a)+ΔH
in the presently disclosed embodiments, Δh=h A2 -H A1 ＝39-35＝4m。H2＝3990m+4m＝3994m。
In another implementation of an embodiment of the present disclosure, step 206 may include:
when the liquid pressure in the annular space reflects that the insertion end of the well completion pipe column is contacted with the top of the back insertion barrel, making a second mark at a second position of the drill rod which is flush with the surface of the wellhead;
the distance from the second marker to the insertion end of the completion string is determined to be a second distance.
Illustratively, referring to FIG. 5, after a second mark A2 is made on the drill pipe, the drill pipe 420 and completion string 410 may be removed together, and then the distance H2 from the second mark A2 to the insertion end of the completion string may be measured to determine a second distance.
Step 207, determining the length of the completion string based on the second distance.
Illustratively, step 207 may include:
obtaining the depth of the retrieval cartridge;
the sum of the second distance and the depth of the pull-back casing is determined to be the length of the completion string.
Referring to fig. 4 or 5, the depth of the reinsertion cylinder 311 is b.
In embodiments of the present disclosure, the depth of the reinserted canister may be measured at the surface prior to running the suspended string into the production casing using the drill pipe.
Illustratively, the length of the completion string h=h2+b.
In the disclosed embodiment, the depth b=2m of the pull-back sleeve 311, then the length h=h2+b=39948 m+2 m=3996 m of the completion string 410. Then after determining the length of completion string 410, drill pipe 420 and completion string 410 may be removed and drill pipe 420 and completion string 410 separated. Completion string 410 has an initial length of (H1-a) -H A2 When the length of the completion string 410 is matched, only a string nipple with the length of 41m is required to be welded on the end, opposite to the insertion end, of the completion string 410 coaxially.
The disclosed embodiments enable a completion string to be spaced a distance from the top of the reinsertion cartridge by running the completion string into the production casing to a first depth using a drill pipe, and the internal bore of the completion string can communicate with the annular space between the hanging string and the production casing. Fluid is then injected into the annular space so that the fluid can circulate within the annular space and completion string. The completion string is then run into the production casing and the fluid pressure in the annulus monitored in real time. When the insertion end of the completion string contacts the top of the reinsertion barrel, the internal bore of the completion string is not in communication with the annular space, and fluid can no longer circulate in the annular space and the internal bore of the completion string, and fluid pressure in the annular space can rise. Thus, by monitoring the change in fluid pressure within the annular space, it is determined whether the inserted end of the completion string is in contact with the top of the reinsertion cartridge. When the fluid pressure in the annular space reflects that the inserted end of the completion string is in contact with the top of the reinsertion barrel, the completion string is stopped from being lowered, and a second distance from the inserted end of the completion string to the wellhead at that time is obtained. And finally, determining the length of the well string according to the second distance. According to the method, a well completion pipe string is not required to be inserted into the reinsertion barrel, the possibility of damage to a sealing ring outside the well completion pipe string is reduced, the sealing effect between the well completion pipe string and the reinsertion barrel when the well completion pipe string is reinserted into the reinsertion barrel is guaranteed, the well completion quality is improved, and the production capacity of an oil and gas well is guaranteed.
The foregoing description of the preferred embodiments of the present disclosure is provided for the purpose of illustration only, and is not intended to limit the disclosure to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and principles of the disclosure.
Claims (10)
1. A method of determining the length of a completion string for reinsertion into a reinsertion cartridge in a production casing, the reinsertion cartridge being located at the top of a hanging string located in the production casing in a well and having a hanging packer therebetween, the method comprising:
lowering the completion string into the production casing to a first depth by using a drill pipe, wherein the first depth is the distance from the insertion end of the completion string to a wellhead;
injecting a fluid into an annular space between the hanging string and the production casing, circulating the fluid within the annular space and the completion string;
continuing to lower the completion string and monitoring the fluid pressure in the annular space in real time;
stopping lowering the completion string when the fluid pressure within the annular space reflects that the insertion end of the completion string is in contact with the top of the reinsertion barrel;
acquiring a second distance from the insertion end of the completion string to a wellhead when the insertion end of the completion string is in contact with the top of the reinsertion barrel;
and determining the length of the completion string according to the second distance.
2. The length determining method of claim 1, wherein stopping lowering the completion string when the fluid pressure within the annular space reflects that the inserted end of the completion string is in contact with the top of the reinsertion cartridge comprises:
and when the liquid pressure in the annular space rises by a set amplitude within a set time and continuously rises, judging that the insertion end of the completion string is contacted with the top of the plug-in cylinder, and stopping lowering the completion string.
3. The length determining method according to claim 2, wherein the set time is 5 to 10 seconds and the set amplitude is 200 to 300%.
4. The length determining method of claim 1, wherein the injecting fluid into the annulus between the hanging string and the production casing to circulate the fluid within the annulus and the completion string comprises:
and injecting clear water into an annular space between the suspension pipe column and the production casing pipe by adopting a fracturing truck at a first pressure and a first displacement, so that the liquid circularly flows in the annular space and the back-inserted cylinder until the pump pressure of the fracturing truck is stabilized at a second pressure and the displacement is kept unchanged.
5. The length determining method according to claim 4, wherein the first pressure is 1 to 1.5MPa and the first displacement is 0.1 to 0.5m 3 /min。
6. The length determining method of claim 1, wherein running the completion string into the production casing to a first depth using a drill pipe comprises:
obtaining the theoretical distance from the top of the back-inserted cylinder to a wellhead;
and lowering the completion pipe string into the production casing to the first depth by adopting a drill rod according to the theoretical distance, wherein the difference value between the first depth and the theoretical distance is a set value, and the set value is 5-10 m.
7. The method of claim 6, wherein the obtaining the theoretical distance from the top of the back-insertion barrel to the wellhead comprises:
recording the running depth of the drill rod when the suspension pipe column is run into the production casing by adopting the drill rod;
and determining the running depth of the drill rod as the theoretical distance from the top of the back-inserted cylinder to the wellhead.
8. The length determination method of claim 1, wherein the obtaining a second distance of the insertion end of the completion string from the wellhead when the insertion end of the completion string is in contact with the top of the reinsertion cartridge comprises:
when the well completion string is lowered into the production casing to a first depth by a drill pipe, making a first mark at a first position of the drill pipe which is flush with the wellhead surface;
making a second mark in a second position of the drill pipe flush with the wellhead surface when the fluid pressure in the annular space reflects that the insertion end of the completion string is in contact with the top of the reinsertion cartridge;
the second distance is determined based on the first depth and the distance between the first mark and the second mark.
9. The length determination method of claim 1, wherein the obtaining a second distance of the insertion end of the completion string from the wellhead when the insertion end of the completion string is in contact with the top of the reinsertion cartridge comprises:
making a second mark in a second position of the drill pipe flush with the wellhead surface when the fluid pressure in the annular space reflects that the insertion end of the completion string is in contact with the top of the reinsertion cartridge;
determining that the distance from the second marker to the insertion end of the completion string is the second distance.
10. The length determining method according to any one of claims 1 to 9, wherein the determining the length of the completion string according to the second distance comprises:
acquiring the depth of the back-inserting cylinder;
and determining the sum of the second distance and the depth of the reinsertion barrel as the length of the completion string.
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