CN112554835B - Snubbing completion operation process method - Google Patents
Snubbing completion operation process method Download PDFInfo
- Publication number
- CN112554835B CN112554835B CN202011548832.9A CN202011548832A CN112554835B CN 112554835 B CN112554835 B CN 112554835B CN 202011548832 A CN202011548832 A CN 202011548832A CN 112554835 B CN112554835 B CN 112554835B
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- Prior art keywords
- well
- pressure
- shaft
- temporary
- oil
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
-
- 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
- E21B47/06—Measuring temperature or pressure
Abstract
The invention discloses a snubbing serving operation process method, which comprises the steps of preparing a shaft, measuring pressure, temporarily closing the shaft, verifying the sealing property, putting a pump down, opening an oil-gas channel and the like, and belongs to the technical field of downhole operation of oil-gas wells. And (3) completing the preparation work of the shaft by the operation of the coiled tubing under pressure, and measuring the static pressure to provide a basis for determining the opening mode and the opening pressure of the bottom hole temporary block. And (4) putting the coiled tubing into the snubbing operation tool string under pressure, and temporarily closing the shaft after setting the temporary block at the bottom of the shaft. And after the sealing performance of the shaft is verified, completing the well by adopting a conventional oil well pump completion process. The oil-gas flow channel is opened by adopting a ground pressurizing or in-well negative pressure mode, so that the rapid production is realized. And after the temporary blocking at the bottom of the well is dissolved, the full-drift-diameter production of the shaft is realized. The invention does not need a well killing hydraulic well, has no pollution to a reservoir, can realize timely production after pump descending, can recover the full drift diameter state of a shaft without additional construction operation, can shorten the production period of an oil-gas well, saves the investment cost and improves the economic benefit of the whole development.
Description
Technical Field
The invention relates to the technical field of downhole operation of oil and gas wells, is suitable for snubbing serving in the production and completion process of an oil well, and particularly relates to a snubbing serving operation process method.
Background
In the process of well completion of an oil-gas well, because a channel for formation fluid to flow to a shaft is opened in the processes of perforation, fracturing and the like, when the construction is carried out in the well opening state of an oil-well pump and the like, a wellhead pressure operation device or an operation mode of putting a well completion pipe string after well killing is generally adopted for well control safety. The tubular column of complicated combinations such as charge pump, water pump can't be gone into to well head area pressure operation, and well control risk is higher, and the process is complicated, and construction cycle is longer, and the operating cost is high, and the suitability has received great restriction. The conventional well killing needs to use a large amount of high-density well killing fluid, so that the operation cost is increased, the reservoir is easily polluted, the effects of yield increasing measures such as fracturing and the like are influenced, the oil and gas recovery ratio is reduced, the well killing fluid needs to be drained back after the well is opened, the production time of the oil and gas well is prolonged, and the overall development benefit of the oil and gas field is seriously influenced. Therefore, research on the technical method of the snubbing completion operation is urgent.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides a non-killing well completion operation process method, which opens an oil-gas flow channel in a mode of pressing the ground or forming negative pressure in a well after the construction of setting a bottom hole temporary block in the well, lowering a pump and the like, and forms a full drift diameter of a shaft after the bottom hole temporary block is dissolved, thereby realizing the purposes of no pollution to a reservoir and quick production, saving the investment cost, shortening the construction period and improving the economic benefit of the whole development.
In order to solve the technical problems, the invention adopts the following technical scheme:
a non-killing well completion operation process method is characterized by comprising the following steps:
1) preparing a well bore: moving the coiled tubing operating machine, and completing preparation work of a shaft including well cleaning and scraping under the condition that a wellhead has pressure;
2) and (3) pressure measurement: a pressure gauge is put into the well testing vehicle to a preset position, and static pressure or pressure gradient is measured, so that basis is provided for determining the opening mode and the opening pressure of the bottom temporary block;
3) temporarily closing the shaft: the coiled tubing is pressed into the snubbing operation tool string under pressure, wherein the snubbing operation tool string comprises the coiled tubing, a connector, a motor head assembly, a setting tool and a bottom hole temporary block, the snubbing operation tool string is pressed to the coiled tubing to the designed pressure through a ground pump truck after being pressed to the setting depth (the position of a casing coupling is avoided), pressure is suddenly released, and the bottom hole temporary block is set and released; slowly lifting the coiled tubing, wherein the hanging weight is normal, which indicates that the temporary blocking at the bottom of the well is successful in releasing the hand; after lifting the continuous oil pipe for 5-10 m, slowly lowering the continuous oil pipe to a position where the continuous oil pipe meets a blockage, pressurizing the continuous oil pipe for no more than 20KN, and repeatedly detecting the temporary blocking of the bottom of the well for three times to ensure that the position is correct;
4) and (3) verifying the sealing performance: lifting the coiled tubing string, opening a casing gate, observing an overflow condition, verifying the sealing condition of the shaft, if no overflow display exists within 30min, indicating that the setting condition of the temporary block at the bottom of the well is good, closing the casing gate, and lifting the coiled tubing string;
5) a lower pump: withdrawing the coiled tubing operation machine, and moving the conventional workover rig up; installing a kill well, a choke manifold and a pipeline, replacing a large four-way joint at a well head, installing a blowout preventer and testing pressure to be qualified; a production pipe column is put in through an oil pipe, and the pump-in depth is adjusted at the wellhead; disassembling the blowout preventer, installing the Christmas tree hanging device, and testing the pressure to be qualified;
6) opening an oil gas channel: according to the measured formation pressure and the actual situation of a wellhead Christmas tree, a positive pressing mode or a negative pressing mode is adopted for a shaft, a positive pressure difference or a negative pressure difference is generated on a temporary block at the bottom of the well, and an oil-gas channel is opened; after the trial extraction is qualified, the rapid production is realized; and the bottom hole temporary block slides to the bottom hole after losing the seal in the saline fluid in the well and is completely dissolved, so that the full-drift-diameter production of the shaft is realized.
Further, in the step 1), if thick oil exists in the well, the well needs to be washed by heat, so that the thick oil and dead oil in the well bore are washed cleanly, and clean well bore conditions are provided for the running of a manometer and a follow-up tool.
Further, in the step 2), the predetermined position may be a setting depth of a temporary block at the bottom of the well, and the static pressure at the depth is directly measured; for deep wells and ultra-deep wells, if the setting depth of the temporary blocking block at the bottom of the well is greater than the maximum depth of the pressure gauge which can be set, selecting a preset position at a certain depth above the setting depth of the temporary blocking block at the bottom of the well, measuring a pressure gradient of 100m upwards, and calculating the static pressure at the setting depth of the temporary blocking block at the bottom of the well.
Further, in the step 3), the connector is a rivet or a composite connector, and the motor head assembly is a check valve + a safety joint.
Further, in the step 5), the production string comprises a sucker rod pump and a rodless pump.
Further, in the step 6), the well bore is positively pressurized specifically by a pump truck through a casing gate, and a positive pressure difference effect is generated on a temporary bottom hole block to open an oil and gas channel; the mode of enabling the shaft to generate negative pressure is specifically a mode of pumping down the liquid level through a pump, a mode of discharging nitrogen liquid and reducing the liquid level, or a mode of discharging nitrogen mixed water and discharging liquid and reducing the liquid level, so that the shaft generates negative pressure, a negative pressure difference effect is generated on a temporary block at the bottom of the well, and an oil-gas channel is opened.
Further, in the step 6), if the pressure of the pump truck which is positively pressed to the shaft by the casing gate is judged to be greater than the rated working pressure of the Christmas tree according to the measured formation pressure and the pressure difference required by opening the temporary bottom blocking, and the pressure loss is considered, a mode of generating negative pressure on the shaft is selected, a negative pressure difference effect is generated on the temporary bottom blocking, an oil gas channel is opened, the pressure difference required by opening the temporary bottom blocking is subtracted from the measured formation pressure, and the depth of the liquid level is reduced; and otherwise, adopting a mode that the pump truck is positively pressed towards the shaft by the casing gate, generating a positive pressure difference effect on the bottom hole temporary block, opening an oil-gas channel, and calculating the pressure required by the ground pump truck by subtracting the hydrostatic column pressure of the setting depth from the measured formation pressure and adding the pressure difference and the pressure loss required by the opening of the bottom hole temporary block.
Further, the opening pressure of the temporary bottom hole block is larger than the design pressure required by the setting release.
Further, the bottom hole temporary block is fully soluble.
Further, during the snubbing completion operation, the effective time of the bottom temporary block sealing the wellbore is longer than the operation time from setting to opening of the oil and gas channel.
Compared with the prior art, the invention has the beneficial effects that: the invention uses the shaft bottom temporary block to temporarily close the shaft, does not need a well control hydraulic well, has no pollution to a reservoir, can realize timely production after pumping down, can recover the full-bore state of the shaft without additional construction operation, can shorten the production period of the oil-gas well, greatly saves the investment cost and improves the economic benefit of the whole development.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the invention.
In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
The present invention will be described in further detail with reference to specific embodiments below:
the invention provides a non-killing well completion operation process method, which is applied to the following well conditions: the rated working pressure of the production tree at the wellhead is P, the setting depth of the temporary block at the bottom of the well is H, the pressure of a hydrostatic column corresponding to the setting depth is rho gH, and the opening differential pressure (positive differential pressure or negative differential pressure) is delta P. The method comprises the following steps:
(1) the coiled tubing operation machine is moved, a blowout preventer, an injection head and other equipment are hung on a KQ130/105 oil (gas) production tree, and when the wellhead has pressure, the coiled tubing bottom belt is used for drifting the well to a setting depth of a temporary block at the bottom of the well which is 100m below the setting depth of the temporary block. And (4) backwashing the well for more than one week by using clear water to achieve the consistency of the properties of the inlet and the outlet. If the well is thick oil, the well is washed by heating clear water with a blast furnace car or using electric pump liquid.
(2) And (6) pulling out the drift size gauge to check whether deformation exists. If the continuous oil pipe is not deformed, the scraper of the bottom belt of the continuous oil pipe repeatedly scrapes the setting well section of the temporary block at the bottom of the well for more than 3 times until the suspended weight is displayed normally without blocking. And then back washing the well with clear water or hot water for more than one week.
(3) According to the setting depth of the temporary block at the bottom of the well, a test car is put into a pressure gauge to a preset position to measure static pressure or pressure gradient, and static pressure P at the setting depth is obtaineda。
At this time, the following judgment is made: static pressure P at the setting depthaSubtracting the depth hydrostatic column pressure rho gH, adding the opening pressure difference delta P and the pressure loss PbI.e. the pump pressure P required for opening the bottom hole temporary block by positive pressure differencepCompared with the rated working pressure P for producing the Christmas tree. If Pp＝Pa-ρgH+ΔP+Pb>And P, opening the oil-gas channel by using a pumping way, a nitrogen (mixed steam water) discharging way and other liquid-level lowering ways to generate negative pressure in the shaft. The depth of the liquid level is reduced to [ delta P- (P) ]a-ρgH)]And/[ rho ] g. Otherwise, the oil-gas channel is opened by adopting a mode that the pump truck is positively pressed to the shaft by the casing pipe gate, and the pump pressure is Pa-ρgH+ΔP+Pb。
(4) The coiled tubing is pressed into the snubbing operation tool string under pressure to the setting depth: the continuous oil pipe, the connector, the check valve, the safety joint, the setting tool and the bottom hole temporary block.
(5) And positively pressurizing the coiled tubing to the designed pressure through a ground pump truck, stabilizing the pressure until the pressure is suddenly released, and setting and releasing the hand in a shaft bottom temporary block.
(6) And slowly lifting the coiled tubing, wherein the hanging weight is normal, which indicates that the temporary blocking at the bottom of the well is successful in releasing the hand. After the coiled tubing is lifted for 10m, the coiled tubing is slowly lowered to the position where the coiled tubing meets a blockage, the pressurization is not more than 20KN, and the bottom of the well is repeatedly detected for three times to ensure that the position is correct.
(7) And lifting the coiled tubing string 100 m. And opening the casing gate and observing the overflow condition. If no overflow is displayed within 30min, the condition of setting the bottom hole temporary block is good. And closing the casing gate and pulling out the coiled tubing string.
(8) And withdrawing the coiled tubing operation machine and moving the coiled tubing operation machine to a conventional workover rig. Installing a kill well, a choke manifold and a pipeline, replacing a large four-way joint at a well head, installing a blowout preventer, testing pressure to be qualified, and preparing to lower a pump.
(9) The quality of the pump is checked according to the type of pump being run. The production pipe columns such as an electric submersible pump, a hydraulic piston pump, a tubular pump or a rod pump are put into the well through the oil pipe, and the pump-putting depth is adjusted at the well mouth. And disassembling the blowout preventer, installing the Christmas tree hanging, and testing the pressure to be qualified. And completing the installation and debugging of related matched equipment.
(10) And (4) opening the oil-gas channel by adopting a positive pressing mode of the pump truck towards the shaft by a sleeve gate or a negative pressure mode of the shaft by liquid level reduction such as pumping, nitrogen (mixed water) liquid discharging and the like according to the judgment conclusion and the calculation method in the step (3). And after the trial pumping is qualified, the rapid production is realized. And the bottom hole temporary block slides to the bottom hole after losing the seal in the saline fluid in the well and is completely dissolved, so that the full-drift-diameter production of the shaft is realized.
In summary, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can propose other embodiments within the technical teaching of the present invention, but these embodiments are included in the scope of the present invention.
Claims (10)
1. A non-killing well completion operation process method is characterized by comprising the following steps:
1) preparing a well bore: moving the coiled tubing operating machine, and completing preparation work of a shaft including well cleaning and scraping under the condition that a wellhead has pressure;
2) and (3) pressure measurement: a pressure gauge is put into the well testing vehicle to a preset position, and static pressure or pressure gradient is measured, so that basis is provided for determining the opening mode and the opening pressure of the bottom temporary block;
3) temporarily closing the shaft: the coiled tubing is pressed into the snubbing operation tool string under pressure, wherein the snubbing operation tool string comprises the coiled tubing, a connector, a motor head assembly, a setting tool and a bottom hole temporary block; slowly lifting the coiled tubing, wherein the hanging weight is normal, which indicates that the temporary blocking at the bottom of the well is successful in releasing the hand; after lifting the continuous oil pipe for 5-10 m, slowly lowering the continuous oil pipe to a position where the continuous oil pipe meets a blockage, pressurizing the continuous oil pipe for no more than 20KN, and repeatedly detecting the temporary blocking of the bottom of the well for three times to ensure that the position is correct;
4) and (3) verifying the sealing performance: lifting the coiled tubing string, opening a casing gate, observing an overflow condition, verifying the sealing condition of the shaft, if no overflow display exists within 30min, indicating that the setting condition of the temporary block at the bottom of the well is good, closing the casing gate, and lifting the coiled tubing string;
5) a lower pump: withdrawing the coiled tubing operation machine, and moving the conventional workover rig up; installing a kill well, a choke manifold and a pipeline, replacing a large four-way joint at a well head, installing a blowout preventer and testing pressure to be qualified; a production pipe column is put in through an oil pipe, and the pump-in depth is adjusted at the wellhead; disassembling the blowout preventer, installing the Christmas tree hanging device, and testing the pressure to be qualified;
6) opening an oil gas channel: according to the measured formation pressure and the actual situation of a wellhead Christmas tree, a positive pressing mode or a negative pressing mode is adopted for a shaft, a positive pressure difference or a negative pressure difference is generated on a temporary block at the bottom of the well, and an oil-gas channel is opened; after the trial extraction is qualified, the rapid production is realized; and the bottom hole temporary block slides to the bottom hole after losing the seal in the saline fluid in the well and is completely dissolved, so that the full-drift-diameter production of the shaft is realized.
2. The method for the snubbing completion operation according to claim 1, wherein in step 1), if the well is thick oil, the well needs to be washed by heat to ensure that thick oil and dead oil in the well bore are washed clean, so as to provide clean well bore conditions for the running of the manometer and the subsequent tools.
3. A snubbing completion operation process method according to claim 1, wherein in step 2), the predetermined position can be a temporary block setting depth at the bottom of a well, and the static pressure at the depth is directly measured; for deep wells and ultra-deep wells, if the setting depth of the temporary blocking block at the bottom of the well is greater than the maximum depth of the pressure gauge which can be set, selecting a preset position at a certain depth above the setting depth of the temporary blocking block at the bottom of the well, measuring a pressure gradient of 100m upwards, and calculating the static pressure at the setting depth of the temporary blocking block at the bottom of the well.
4. A process of snubbing serving as a process according to claim 1, wherein in step 3), the connector is a rivet or a composite connector, and the motor head assembly is a check valve + safety joint.
5. A process of snubbing serving as in claim 1, wherein in step 5), said production string comprises a sucker-rod pump and a rodless pump.
6. The method for the snubbing serving as claimed in claim 1, wherein in step 6), the well is positively pressured by a pump truck from a casing gate to the well, and a positive pressure difference is generated on a bottom hole temporary block to open a hydrocarbon channel; the mode of enabling the shaft to generate negative pressure is specifically a mode of pumping down the liquid level through a pump, a mode of discharging nitrogen liquid and reducing the liquid level, or a mode of discharging nitrogen mixed water and discharging liquid and reducing the liquid level, so that the shaft generates negative pressure, a negative pressure difference effect is generated on a temporary block at the bottom of the well, and an oil-gas channel is opened.
7. The method for the snubbing completion operation of claim 6, wherein in the step 6), if the positive pressure of the pump truck towards the shaft from the casing gate is judged to be greater than the rated working pressure of the Christmas tree according to the measured formation pressure and the pressure difference required by opening the temporary bottom-hole block while considering the pressure loss, the mode of generating negative pressure on the shaft is selected, the negative pressure difference action is generated on the temporary bottom-hole block, the oil and gas channel is opened, the pressure difference required by opening the temporary bottom-hole block is subtracted from the measured formation pressure, and the liquid level depth is reduced; and otherwise, adopting a mode that the pump truck is positively pressed towards the shaft by the casing gate, generating a positive pressure difference effect on the bottom hole temporary block, opening an oil-gas channel, and calculating the pressure required by the ground pump truck by subtracting the hydrostatic column pressure of the setting depth from the measured formation pressure and adding the pressure difference and the pressure loss required by the opening of the bottom hole temporary block.
8. The process of claim 1, wherein the opening pressure of the bottom hole temporary block is greater than the design pressure required for setting release.
9. A process of snubbing serving as in claim 1, wherein said bottom hole pause is fully soluble.
10. The method of claim 1, wherein the effective time of the temporary plugging of the bottom of the well to seal the wellbore during the snubbing completion is longer than the time after setting the wellbore and before opening the hydrocarbon passage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011548832.9A CN112554835B (en) | 2020-12-24 | 2020-12-24 | Snubbing completion operation process method |
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| CN202011548832.9A CN112554835B (en) | 2020-12-24 | 2020-12-24 | Snubbing completion operation process method |
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| CN112554835A CN112554835A (en) | 2021-03-26 |
| CN112554835B true CN112554835B (en) | 2022-03-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7921922B2 (en) * | 2008-08-05 | 2011-04-12 | PetroQuip Energy Services, LP | Formation saver sub and method |
| CN103147720B (en) * | 2013-02-18 | 2015-10-14 | 中国石油天然气股份有限公司 | Hydraulic switching valve |
| CN205532477U (en) * | 2016-04-14 | 2016-08-31 | 中国石油天然气股份有限公司 | Not kill -job control valve and high temperature resistant sand control tubular column of giving up thereof |
| CN107489397A (en) * | 2017-09-01 | 2017-12-19 | 成都维泰油气能源技术有限公司 | A kind of solvable bridging plug and oil gas well shaft insulate method temporarily |
| CN211422607U (en) * | 2019-11-06 | 2020-09-04 | 中国石油天然气股份有限公司 | Sand control tubular column and oil production system |
| CN112065295A (en) * | 2020-09-29 | 2020-12-11 | 库尔勒中油能源技术服务有限公司 | Negative pressure snubbing process pipe column |
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