CN109736737B - Method for snubbing tripping of reservoir gas drilling well - Google Patents

Method for snubbing tripping of reservoir gas drilling well Download PDF

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Publication number
CN109736737B
CN109736737B CN201910009287.7A CN201910009287A CN109736737B CN 109736737 B CN109736737 B CN 109736737B CN 201910009287 A CN201910009287 A CN 201910009287A CN 109736737 B CN109736737 B CN 109736737B
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drilling
sand discharge
snubbing
gas
discharge pipeline
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CN109736737A (en
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李宬晓
周长虹
邓虎
许期聪
范黎明
肖劲超
董仕明
颜海
李刚
刘殿琛
黄述春
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China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
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China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
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Abstract

The invention discloses a method for snubbing and tripping in reservoir gas drilling, and belongs to the field of underbalance and gas drilling in the whole process. The method comprises four parts, namely wellhead device configuration, sand discharge pipeline configuration, snubbing tripping and snubbing down drilling, covers equipment configuration, process steps and technical requirements for snubbing tripping after drilling a gas layer in gas drilling, has very strong safety and operability, can keep the whole drilling and well completion processes in an underbalanced state in reservoir gas drilling, and cannot cause any damage to a reservoir.

Description

Method for snubbing tripping of reservoir gas drilling well
Technical Field
The invention relates to an oil and natural gas drilling technology, in particular to a tripping method which is safe and has no harm to a reservoir stratum when a well is drilled by using gas as a circulating medium, and belongs to the field of underbalance and gas drilling in the whole process.
Background
Along with the gradual exhaustion of high-yield and easy-to-open oil and gas resources and the continuous increase of oil and gas requirements, unconventional oil and gas are practical strategic and take over resources. Dense oil and gas is one of the unconventional oil and gas and is also one of the largest potential of oil and gas resources. China's dense oil gas accounts for 35% of newly-discovered oil reserves in recent years, accounts for more than 40% of oil resource amount to be discovered, and almost all middle and deep multi-layer positions (such as a shish system, a mud basin system, a carbo system, a di-stack system, a tri-stack system, a dwara system-chalk system, an ancient system and the like) of domestic oil-gas-containing basins (such as a plurality of basins including Sichuan, Erdos, Tarim and the like) are distributed, so that the method has extremely wide development potential. Due to the low porosity (< 10%), ultra-low permeability (< 0.1 mD) and unique fluid storage and production characteristics of the compact oil and gas reservoir, the bottleneck problems faced by conventional drilling are easily damaged and difficult to find, the single well yield is low, and the input and output benefits are poor. The nitrogen drilling and completion is the most effective means for exploiting the oil and gas resources, and can find the reservoir stratum by 100 percent and obtain the initial productivity of the reservoir stratum; has no damage to the reservoir and improves the single well yield and the recovery ratio. In recent years, the method is applied to oil and gas fields such as Sichuan, Tarim, Jilin, Clarity, Tuha and the like on a large scale, the yield of a single well is improved by 3-20 times compared with that of a slurry drilling and completion well, the benefit development of low-pressure and low-permeability oil and gas reservoirs is realized, and meanwhile, a batch of structures are promoted to obtain breakthrough exploration results.
In the past, natural gas is blown out of a well after a reservoir is uncovered by adopting gas drilling, or the natural gas is carried out of the well along with rock debris, if the gas production rate is large, mud is replaced for well killing before tripping or well completion, the reservoir is damaged, the initial capacity obtained by adopting the gas drilling is damaged, the whole process of drilling and well completion is required to be in an underbalanced state, and higher requirements are provided for process safety, well mouth and ground pipeline reliability. Wellhead devices require the ability to seal drilling tools of different sizes; the sand discharge pipeline has large safety margin of blowout capacity and has the functions of emergency control and pressure relief; the operation process ensures that the natural gas wellhead has no aggregation and zero leakage, and ensures that no well control risk exists in the construction process.
Disclosure of Invention
The invention aims to provide a method for snubbing serving and tripping in reservoir gas drilling aiming at the defects and shortcomings of the prior art, and the method defines the application conditions of snubbing serving and tripping, equipment configuration, process flow and technical requirements and has very strong practicability.
The invention is realized by adopting the following technical scheme:
a method for snubbing tripping of a reservoir gas well is characterized by comprising the following steps: the method comprises four parts of wellhead device configuration, sand discharge pipeline configuration, snubbing tripping process and snubbing down-hole process, wherein:
the wellhead device is configured with a wellhead control facility for configuring reservoir gas drilling to carry out snubbing tripping; the configuration of the sand discharge pipeline is a combustible gas ground discharge channel for snubbing tripping of reservoir gas drilling, the drift diameter is not less than 203mm, the sand discharge pipeline is flatly laid to a combustion pool, if the direction is changed due to condition limitation, the turning angle in a well site is not less than 150 degrees, a pressure relief safety valve is arranged in the straight-through direction of the tail end of the sand discharge pipeline at the edge of the well site, and the set pressure is not higher than 2.0 MPa; the pressure-bearing capacity of the upstream sand discharge pipeline of the pressure relief safety valve is not lower than 7MPa, and the pressure-bearing capacity of the downstream sand discharge pipeline is not lower than 4 MPa.
The wellhead device comprises a rotary blowout preventer, an annular blowout preventer, a double-ram blowout preventer, a drilling cross joint, a choke manifold, a blowout prevention pipeline and a blowout pipeline which are matched with the reservoir pressure; the control pressure of the annular blowout preventer is adjusted to be 5.0-6.0 MPa when the annular blowout preventer is started. The semi-closed gate plate of the double-gate plate blowout preventer is arranged on the upper part, the fully-closed gate plate is arranged on the lower part, a hydraulic flat valve is arranged on one side of the blowout prevention pipeline close to a well head, the hydraulic flat valve is in a normally closed state, all gate valves on a back straight-through direction blowout pipeline are in a normally open state, and the outlet of the blowout pipeline is exposed to fire.
The sand discharge pipeline inlet is provided with a hydraulic flat valve of the sand discharge pipeline, the sand discharge pipeline at a position 6m away from the wellhead is provided with an injection short section, and when the kill-job tripping is started, the injection short section is injected with a distance of not less than 60m3And (4) forming negative pressure at the wellhead by the aid of the nitrogen gas in the/min, pumping the combustible gas gathered at the wellhead to an outlet of a sand discharge pipeline, and igniting open fire at the outlet of the sand discharge pipeline.
The snubbing serving process comprises the following steps:
the method comprises the following steps of firstly, detecting the gas production condition of the stratum, and adopting a pressurized tripping device to operate when sleeve pressure is released or the gas production rate exceeds 10 ten thousand square/day;
secondly, opening a hydraulic flat valve of a sand discharge pipeline, closing a hydraulic flat valve of a blowout prevention pipeline, swabbing a wellhead by injecting nitrogen through an injection short section, detecting the concentration of combustible gas on the upper part and the lower part of a drill floor, and tripping out the drill when no display exists;
thirdly, pulling out the drilling tool assembly in the shaft, sealing the annular space by using the rotary blowout preventer, and placing the centralizer between a top cover of the annular blowout preventer and a rubber core of the rotary blowout preventer when the centralizer is pulled out;
fourthly, closing the annular blowout preventer, opening a hydraulic flat valve of the blowout prevention pipeline, and taking out the rotary blowout preventer control assembly;
fifthly, sealing the annular space by using an annular blowout preventer, and lifting the drilling tool until the drill bit is higher than the fully-sealed flashboard;
and sixthly, closing the fully-closed flashboard, opening the annular blowout preventer, and pulling out the residual drilling tools to finish the pulling out.
The drilling tool combination adopts an 18-degree slope drill rod and optical drill collars with uniform sizes, the deviation of the outer diameters of the optical drill collars is not more than 2mm, and two normally closed check valves are installed near a drill bit.
The snubbing serving process comprises the following steps:
the method comprises the following steps of firstly, detecting the gas production condition of the stratum, and adopting a pressurized tripping device to operate when sleeve pressure is released or the gas production rate exceeds 10 ten thousand square/day;
secondly, opening a hydraulic flat valve of a sand discharge pipeline, closing a hydraulic flat valve of a blowout prevention pipeline, swabbing a wellhead by injecting nitrogen through an injection short section, detecting the concentration of combustible gas on the upper part and the lower part of a drill floor, and drilling down when no display exists;
thirdly, mounting a control assembly of the rotary blowout preventer, and descending the drilling tool assembly until the drill bit is positioned on the fully-closed flashboard;
and fourthly, opening the full-seal flashboard, and sealing the annular space by using a rotary blowout preventer to finish the drilling.
The drilling tool combination adopts an 18-degree slope drill rod and optical drill collars with uniform sizes, the deviation of the outer diameters of the optical drill collars is not more than 2mm, and two normally closed check valves are installed near a drill bit.
Compared with the prior art, the invention has the following beneficial effects:
1. the method for the gas drilling and the snubbing serving of the reservoir stratum, which is composed of the configuration of a wellhead device, the configuration of a sand discharge pipeline, the configuration of a snubbing serving technology and the snubbing serving technology, can safely carry out the snubbing serving operation when gas is used as a circulating medium to drill a gas producing stratum, does not cause any damage to the reservoir stratum, and can keep the whole drilling and well completion processes in an underbalanced state.
2. The method covers the equipment configuration, process steps and technical requirements for implementing snubbing tripping after drilling a gas layer in gas drilling, has very strong safety and operability, can keep the whole drilling and completion processes in an underbalanced state in the gas drilling of a reservoir and cannot cause any damage to the reservoir.
Drawings
The invention will be described in further detail with reference to the following description taken in conjunction with the accompanying drawings and detailed description, in which:
FIG. 1 is a schematic diagram of a wellhead and surface pipeline connections for a method of snubbing serving of a reservoir gas well.
The labels in the figure are:
1. a rotary blowout preventer control assembly; 2. rotating the blowout preventer rubber core; 3. rotating the blowout preventer; 4. an annular blowout preventer top cap; 5. an annular blowout preventer; 6. a semi-closed gate plate; 7. a totally enclosed gate plate; 8. drilling a four-way joint; 9. an 18-degree slope drill rod; 10. a normally closed check valve; 11. an optical drill collar; 12. a centralizer; 13. a blowout prevention line; 14. a blowout prevention pipeline hydraulic flat valve; 15. a dual ram blowout preventer; 16. injecting a short joint; 17. a hydraulic flat valve of the sand discharge pipeline; 18. an outlet of the blowout pipeline; 19. an outlet of the sand discharge pipeline; 20. a sand discharge pipeline; 21. a choke manifold; 22. blowing a pipeline; 23. a pressure relief safety valve; 24. a combustion tank; 25. a drill bit.
Detailed Description
Example 1
The invention discloses a method for snubbing serving of reservoir gas drilling, which comprises four parts, namely a wellhead device configuration, a sand discharge pipeline configuration, a snubbing serving process and a snubbing serving process, wherein: the wellhead device is configured with a wellhead control facility for configuring reservoir gas drilling to carry out snubbing tripping; the configuration of the sand discharge pipeline is a combustible gas ground discharge channel for snubbing tripping of reservoir gas drilling, the drift diameter is not less than 203mm, the sand discharge pipeline is flatly laid to a combustion pool, if the direction is changed due to condition limitation, the turning angle in a well site is not less than 150 degrees, a pressure relief safety valve is arranged in the straight-through direction of the tail end of the sand discharge pipeline at the edge of the well site, and the set pressure is not higher than 2.0 MPa; the pressure-bearing capacity of the upstream sand discharge pipeline of the pressure relief safety valve is not lower than 7MPa, and the pressure-bearing capacity of the downstream sand discharge pipeline is not lower than 4 MPa.
Example 2
Referring to the attached drawings, the best mode of the invention comprises four parts of a wellhead device configuration, a sand discharge pipeline configuration, a no-killing-well tripping process and a no-killing-well drilling process, wherein:
the wellhead device is configured as a wellhead control facility for the non-killing tripping of the reservoir gas drilling, and comprises a rotary blowout preventer 3, an annular blowout preventer 5, a double ram blowout preventer 15, a drilling cross 8, a choke manifold 21, a blowout prevention pipeline 13 and a blowout pipeline 22 which are matched with the reservoir pressure;
the annular blowout preventer 5 is controlled to regulate the pressure to 5.0-6.0 MPa when the drill is started.
The double ram blowout preventer 15 has the semi-seal ram 6 mounted on the upper part and the full seal ram 7 mounted on the lower part.
The hydraulic flat valve 14 is installed on the side of the blowout prevention pipeline 13 close to the wellhead, the hydraulic flat valve 14 is in a normally closed state, and then all gate valves on the straight-through direction blowout pipeline 22 are in a normally open state.
The open fire is ignited at the blowout line outlet 18.
The configuration of the sand discharge pipeline is that the reservoir gas drilling carries out a combustible gas ground discharge channel of snubbing trip-in, the drift diameter is not less than 203mm, the sand discharge pipeline 20 is flatly laid to the combustion pool 24, if the direction is changed due to the condition limitation, the turning angle in a well site is not less than 150 degrees, a pressure relief safety valve 23 is arranged in the straight-through direction of the tail end of the sand discharge pipeline 20 in the well site, and the set pressure is not higher than 2.0 MPa; the pressure-bearing capacity of the upstream sand discharge pipeline 20 of the pressure relief safety valve 23 is not lower than 7MPa, and the pressure-bearing capacity of the downstream sand discharge pipeline 20 is not lower than 4 MPa.
The inlet of the sand discharge pipeline 20 is provided with a sand discharge pipeline hydraulic flat valve 17.
An injection short section 16 is arranged on a sand discharge pipeline 20 at a position 6m away from a wellhead, and nitrogen gas with the flow rate not lower than 60m3/min is injected into the injection short section 16 during snubbing trip, so that negative pressure is formed at the wellhead to pump combustible gas gathered at the wellhead to a sand discharge pipeline outlet 19.
The outlet 19 of the sand discharge pipeline is lighted by open fire.
The snubbing serving process comprises the following steps:
the method comprises the following steps of firstly, detecting the gas production condition of the stratum, and adopting a pressurized tripping device to operate when sleeve pressure is released or the gas production rate exceeds 10 ten thousand square/day;
secondly, opening a hydraulic flat valve 17 of a sand discharge pipeline, closing a hydraulic flat valve 14 of a blowout prevention pipeline, swabbing a wellhead by injecting nitrogen through an injection short section 16, detecting the concentration of combustible gas on the upper part and the lower part of a drill floor, and tripping the drill when no display exists;
thirdly, the drilling tool assembly in the shaft is pulled out, the annular space is sealed by the rotary blowout preventer 3, and the centralizer 12 is placed between the annular blowout preventer top cover 4 and the rotary blowout preventer rubber core 2 when the drill is pulled out to the centralizer 12;
fourthly, closing the annular blowout preventer 5, opening a hydraulic flat valve 14 of the blowout prevention pipeline, and taking out the rotary blowout preventer control assembly 1;
fifthly, sealing the annular space by using an annular blowout preventer 5, and lifting the drilling tool until the drill bit 25 is higher than the full-seal ram 7;
and a sixth step of closing the full-closed ram 7, opening the annular blowout preventer 5, and pulling out the residual drilling tools to finish the pulling out.
The drilling tool assembly adopts an 18-degree slope drill rod 9 and optical drill collars 11 with uniform sizes, the deviation of the outer diameters of the optical drill collars 11 is not more than 2mm, and two normally closed check valves 10 are installed near a drill bit.
The snubbing serving process comprises the following steps:
the method comprises the following steps of firstly, detecting the gas production condition of the stratum, and adopting a pressurized tripping device to operate when sleeve pressure is released or the gas production rate exceeds 10 ten thousand square/day;
secondly, opening a hydraulic flat valve 17 of a sand discharge pipeline, closing a hydraulic flat valve 14 of a blowout prevention pipeline, swabbing a wellhead by injecting nitrogen through an injection short section 16, detecting the concentration of combustible gas on the upper part and the lower part of a drill floor, and drilling down when no display exists;
thirdly, installing the rotary blowout preventer control assembly 1, and running the drilling tool assembly until the drill bit 25 is positioned above the full-seal ram 7;
and fourthly, opening the full-seal ram 7, and sealing the annular space by using the rotary blowout preventer 5 to finish the drilling.
The drilling tool assembly adopts an 18-degree slope drill rod 9 and an optical drill collar 11 with uniform size, the deviation of the outer diameter of the optical drill collar is not more than 2mm, and two normally closed check valves 10 are installed near a drill bit.

Claims (6)

1. A method for snubbing tripping of a reservoir gas well is characterized by comprising the following steps: the method comprises four parts of wellhead device configuration, sand discharge pipeline configuration, snubbing tripping process and snubbing down-hole process, wherein: the wellhead device is configured with a wellhead control facility for configuring reservoir gas drilling to carry out snubbing tripping; the configuration of the sand discharge pipeline is a combustible gas ground discharge channel for snubbing tripping of reservoir gas drilling, the drift diameter is not less than 203mm, the sand discharge pipeline is flatly laid to a combustion pool, if the direction is changed due to condition limitation, the turning angle in a well site is not less than 150 degrees, a pressure relief safety valve is arranged in the straight-through direction of the tail end of the sand discharge pipeline at the edge of the well site, and the set pressure is not higher than 2.0 MPa; the pressure-bearing capacity of an upstream sand discharge pipeline of the pressure relief safety valve is not lower than 7MPa, and the pressure-bearing capacity of a downstream sand discharge pipeline is not lower than 4 MPa;
the snubbing serving process comprises the following steps:
the method comprises the following steps of firstly, detecting the gas production condition of the stratum, and adopting a pressurized tripping device to operate when sleeve pressure is released or the gas production rate exceeds 10 ten thousand square/day;
secondly, opening a hydraulic flat valve of a sand discharge pipeline, closing a hydraulic flat valve of a blowout prevention pipeline, swabbing a wellhead by injecting nitrogen through an injection short section, detecting the concentration of combustible gas on the upper part and the lower part of a drill floor, and drilling down when no display exists;
thirdly, mounting a control assembly of the rotary blowout preventer, and descending the drilling tool assembly until the drill bit is positioned on the fully-closed flashboard;
and fourthly, opening the full-seal flashboard, and sealing the annular space by using a rotary blowout preventer to finish the drilling.
2. The method of claim 1, wherein the snubbing serving of the reservoir gas drilling is performed by: the wellhead device comprises a rotary blowout preventer, an annular blowout preventer, a double-ram blowout preventer, a drilling cross joint, a choke manifold, a blowout prevention pipeline and a blowout pipeline which are matched with the reservoir pressure; when the annular blowout preventer is started, the control pressure is adjusted to be 5.0-6.0 Mpa, the half-seal flashboard of the double-flashboard blowout preventer is arranged on the upper portion, the full-seal flashboard is arranged on the lower portion, a hydraulic flat valve is arranged on one side, close to a well head, of the blowout prevention pipeline, the hydraulic flat valve is in a normally closed state, all gate valves on the blowout prevention pipeline in the straight-through direction are in a normally open state, and open fire is generated at the outlet of the blowout prevention pipeline.
3. The method of claim 1, wherein the snubbing serving of the reservoir gas drilling is performed by: the sand discharge pipeline inlet is provided with a hydraulic flat valve of the sand discharge pipeline, the sand discharge pipeline at a position 6m away from the wellhead is provided with an injection short section, and when the kill-job tripping is started, the injection short section is injected with a distance of not less than 60m3And (4) forming negative pressure at the wellhead by the aid of the nitrogen gas in the/min, pumping the combustible gas gathered at the wellhead to an outlet of a sand discharge pipeline, and igniting open fire at the outlet of the sand discharge pipeline.
4. The method of claim 1, wherein the snubbing serving of the reservoir gas drilling is performed by: the drilling tool combination adopts an 18-degree slope drill rod and optical drill collars with uniform sizes, the deviation of the outer diameters of the optical drill collars is not more than 2mm, and two normally closed check valves are installed near a drill bit.
5. The method of claim 1, wherein the snubbing serving of the reservoir gas drilling is performed by: the snubbing serving process comprises the following steps:
the method comprises the following steps of firstly, detecting the gas production condition of the stratum, and adopting a pressurized tripping device to operate when sleeve pressure is released or the gas production rate exceeds 10 ten thousand square/day;
secondly, opening a hydraulic flat valve of a sand discharge pipeline, closing a hydraulic flat valve of a blowout prevention pipeline, swabbing a wellhead by injecting nitrogen through an injection short section, detecting the concentration of combustible gas on the upper part and the lower part of a drill floor, and drilling down when no display exists;
thirdly, mounting a control assembly of the rotary blowout preventer, and descending the drilling tool assembly until the drill bit is positioned on the fully-closed flashboard;
and fourthly, opening the full-seal flashboard, and sealing the annular space by using a rotary blowout preventer to finish the drilling.
6. The method of claim 5, wherein the snubbing serving of the reservoir gas drilling is performed by: the drilling tool combination adopts an 18-degree slope drill rod and optical drill collars with uniform sizes, the deviation of the outer diameters of the optical drill collars is not more than 2mm, and two normally closed check valves are installed near a drill bit.
CN201910009287.7A 2019-01-04 2019-01-04 Method for snubbing tripping of reservoir gas drilling well Active CN109736737B (en)

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CN110529076A (en) * 2019-08-30 2019-12-03 中国石油集团川庆钻探工程有限公司 A kind of safety working method of inert gas suction well head fuel gas
CN110821445A (en) * 2019-10-16 2020-02-21 中国石油集团川庆钻探工程有限公司 Nitrogen pumping operation method under condition of low-volume natural gas formation

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CN2711380Y (en) * 2004-06-17 2005-07-20 韩永利 Apparatus for anti-blowout during snubbing serving for full-sealing zero-pressure conversion oil-water well
CN101922285A (en) * 2009-07-31 2010-12-22 中国石油集团川庆钻探工程有限公司钻采工艺技术研究院 Method for safely tripping gas drilling tool in case of encountering air layer
CN105178859B (en) * 2015-10-10 2017-07-14 中国石油集团川庆钻探工程有限公司 A kind of self-priming reacting cycle gas drilling system of full well section for oil/gas drilling
CN105971536A (en) * 2016-06-30 2016-09-28 中国石油集团西部钻探工程有限公司 Pressure control device for whole-process underbalanced drilling and use method
CN106444563A (en) * 2016-12-12 2017-02-22 中国石油集团川庆钻探工程有限公司 Safety guarantee system applicable to gas drilling

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