CN120026896A - A solvent lifting and immersion well testing method for high wax content wells - Google Patents
A solvent lifting and immersion well testing method for high wax content wells Download PDFInfo
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- CN120026896A CN120026896A CN202311558291.1A CN202311558291A CN120026896A CN 120026896 A CN120026896 A CN 120026896A CN 202311558291 A CN202311558291 A CN 202311558291A CN 120026896 A CN120026896 A CN 120026896A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention discloses a well testing method for lifting and soaking a high-wax-content well solvent, which is characterized in that after a well-passing steel wire tool string is put into an oil pipe and is blocked, a wax dissolving agent is pumped between the well-passing steel wire tool string and the inner wall of the oil pipe, the well-passing steel wire tool string and the inner wall of the oil pipe are soaked and dissolved by the wax dissolving agent, then after the test tool string is put into the oil pipe and blocked along the oil pipe, the wax dissolving agent is pumped between the test tool string and the inner wall of the oil pipe, the wax ring between the test tool string and the inner wall of the oil pipe is soaked and dissolved by the wax dissolving agent, a cavity dissolving structure is formed between the well-passing steel wire tool string or the test tool string and the inner wall of the oil pipe, and the wax dissolving agent is put into the wax dissolving agent, so that the consumption of the wax dissolving agent can be reduced, the problem that the tool string is blocked, the test tool drops is solved from the upper end of the wax ring, the operation risk and the cost are also greatly improved, and the success rate of recording data is effectively reduced.
Description
Technical Field
The invention belongs to the technical field of oil and gas reservoir construction, and particularly relates to a high-wax-content well solvent lifting soaking well testing method.
Background
In the development and production process of the oil and gas reservoir, dynamic monitoring of the oil and gas reservoir is needed for deepening geological awareness, efficient development of a power-assisted block, supporting reserve reporting and scheme compiling, and data recording is carried out, including but not limited to stratum pressure and temperature monitoring, injection profile monitoring and other means. Some jurisdictions have deep gas reservoirs (8271 m), high pressure (144 MPa), high wax content (18.83%), complex fluid phases, difficult and challenging dynamic monitoring data logging caused by the influence of wax in a well bore, dynamic monitoring of 63 well times in nearly three years, 37 well times in the case of blockage, successful 38 well times and success rate of 60 percent, and well logging caused by the fact that a steel wire tool string is twisted on top in the treatment process after the steel wire tool string is blocked during well testing operation, thus complicating the well operation and even affecting oil and gas production.
Aiming at a well with high wax content, a continuous oil pipe dredging and steel wire well testing or continuous oil pipe dredging and continuous oil pipe well testing mode is generally adopted to improve the success rate of data logging, but the technical mode has the problems of long period, high cost, slow team organization and the like.
At present, in order to save production cost, when adopting steel wire drift dredging and steel wire well testing mode, the tool string is generally lifted up after meeting the blockage to pump wax-dissolving agent into a shaft, as shown in fig. 4, after the shaft blockage is dissolved, the tool string is put into the steel wire tool string again, and the problems of high consumption and high cost of the wax-dissolving agent exist in the mode, and the dissolution efficiency is low, so that the problem of meeting the blockage still exists in the secondary well testing mode, therefore, the steel wire casting and fishing well testing process is required to be optimized in a targeted manner, thereby improving the success rate of well testing operation and meeting the requirement of geological data logging.
Disclosure of Invention
The invention aims to provide a solvent lifting, soaking and well testing method for a high-wax-content well, which aims to solve the problems of blockage, blockage and falling of a testing tool in the existing tool string, effectively reduce the operation risk and cost and improve the success rate of data recording.
A well testing method for lifting and soaking a high-wax-content well solvent comprises the following steps:
Putting the pigging steel wire tool string into an oil pipe, pumping a wax dissolving agent between the pigging steel wire tool string and the inner wall of the oil pipe when the pigging steel wire tool string is put into a block, soaking and dissolving a wax ring between the pigging steel wire tool string and the inner wall of the oil pipe by using the wax dissolving agent to finish pigging work, and taking out the pigging steel wire tool string;
And then placing the test tool string along the oil pipe, pumping a wax dissolving agent between the test tool string and the inner wall of the oil pipe after the test tool string is placed in a blocking state, soaking and dissolving a wax ring between the test tool string and the inner wall of the oil pipe by using the wax dissolving agent, and retrieving the test tool string after the test tool string reaches a set position for testing, so that the well testing work can be completed.
Preferably, the maximum diameter of the drift wire tool or test tool string is less than the inner diameter of the oil pipe.
Preferably, a tensile test is adopted to obtain whether the test tool string or the pigtail wire tool string meets the resistance or not in the process of lowering the test tool string or the pigtail wire tool string.
Preferably, after the set position is reached, the tension value of the current position testing tool string or the well logging steel wire tool string is obtained, if the tension value of the current position testing tool string or the well logging steel wire tool string is smaller than the set threshold value, whether the testing tool string or the well logging steel wire tool string is blocked is indicated, and if not, the testing tool string or the well logging steel wire tool string is not blocked.
Preferably, the blowout prevention device installed at the wellhead is tested for pressure prior to testing the well.
Preferably, after the pressure test is qualified, the pressure is relieved to the balance pressure, and after the pressure in the blowout prevention pipe is balanced with the pressure in the well, the blowout prevention system is completely opened under the condition of ensuring the sealing and no leakage.
Preferably, when the well-dredging steel wire tool string is put into an oil pipe to dredge a well, the speed within 50m from a well head in the descending process is not more than 10m/min, and the speed is not more than 15m/min at a position 100m from a reducing position or a target position.
Preferably, the speed of the drift wire tool string in the process of lifting the drift wire tool string from the oil pipe is not more than 70m/min.
Preferably, when the test tool string is put into the oil pipe to be pumped, the speed within 50m from the wellhead in the lowering process is not more than 10m/min, and the speed is not more than 15m/min at the position 100m from the reducing position or the target position.
Preferably, the speed of the test tool string during lifting from the oil pipe is not more than 70m/min.
Compared with the prior art, the invention has the following beneficial technical effects:
The invention provides a well testing method for lifting and soaking a high-wax-content well solvent, which comprises the steps of placing a well logging steel wire tool string into an oil pipe, pumping a wax dissolving agent along the space between the well logging steel wire tool string and the inner wall of the oil pipe after the well logging steel wire tool string is placed into a block, soaking and dissolving a wax ring between the well logging steel wire tool string and the inner wall of the oil pipe by using the wax dissolving agent to finish well logging work, taking out the well logging steel wire tool string, placing a testing tool string along the oil pipe, pumping the wax dissolving agent along the space between the testing tool string and the inner wall of the oil pipe after the testing tool string is placed into the block, soaking and dissolving the wax ring between the testing tool string and the inner wall of the oil pipe by using the wax dissolving agent, retrieving the testing tool string after the testing tool string reaches a set position, forming a well testing work by using the wax dissolving cavity structure between the well logging steel wire tool string or the testing tool string and the inner wall of the oil pipe, reducing the consumption of the wax dissolving agent, dissolving the wax ring, greatly improving the use rate of the wax dissolving agent, improving the efficiency after the testing tool string is placed into the first time, improving the success rate of the testing tool string or the testing tool string, and solving the problems.
Preferably, the maximum diameter of the well logging wire tool or the testing tool string is smaller than the inner diameter of the oil pipe, and the problem of clamping caused by the too small inner diameter of the oil pipe in the lowering process is avoided.
Preferably, when the pigging steel wire tool or the test tool string is put into the oil pipe to carry out pigging, the pigging steel wire tool or the test tool string is lowered and lifted according to the set speed, so that tension data of the pigging steel wire tool or the test tool string can be accurately obtained, wax dissolving operation treatment can be timely carried out, and the working efficiency is improved.
Drawings
FIG. 1 is a schematic flow chart of a well test method for lifting and soaking a high-wax-content well solvent according to an embodiment of the invention.
FIG. 2 is a schematic diagram of a high wax well bore wax plug in accordance with an embodiment of the present invention.
FIG. 3 is a schematic diagram of a well bore plugged after a high wax content well tool string operation is blocked in accordance with an embodiment of the present invention.
FIG. 4 is a schematic diagram of a wellbore for pumping wax-soluble agent in a prior art method.
FIG. 5 is a schematic illustration of a high wax well solvent lift soak in an embodiment of the present invention.
In the figure, a casing pipe 1, an oil pipe 2, a wax ring 3, a packer 4, a perforation section 5, a casing shoe 6, an oil and gas reservoir 7, a wax dissolving agent 8 and a tool string 9.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in FIG. 1, the invention provides a well testing method for lifting and soaking a solvent of a high-wax-content well, which is used for solving the problems of blocking, blocking and dropping of a testing tool in a tool string in the process of steel wire well testing operation, effectively reducing the operation risk and cost and improving the success rate of data recording, and specifically comprises the following steps:
Putting the pigging steel wire tool string into the oil pipe 2, pumping a wax dissolving agent between the pigging steel wire tool string and the inner wall of the oil pipe 2 after the pigging steel wire tool string is put into a block, soaking and dissolving a wax ring 3 between the pigging steel wire tool string and the inner wall of the oil pipe 2 by using the wax dissolving agent to finish pigging work, and taking out the pigging steel wire tool string;
Then, the testing tool string is put into the oil pipe 2, after the testing tool string is put into the oil pipe 2 and is blocked, wax dissolving agent is pumped between the testing tool string and the inner wall of the oil pipe 2, the wax ring 3 between the testing tool string and the inner wall of the oil pipe 2 is soaked and dissolved by the wax dissolving agent, and after the testing tool string reaches a set position for testing, the testing tool string is retrieved, so that the well testing work can be completed.
As shown in figure 2, the oil and gas well aimed at by the application is buried in the areas from the casing 1 to the oil and gas reservoir 7, the oil pipe 2 is arranged in the casing 1, the casing shoe 6 is arranged at the outer side of the bottom of the casing 1 to increase the installation stability of the casing 1, the perforation section 5 is arranged at the area of the lower end of the casing 1, a plurality of perforations are arranged at the area of the oil and gas reservoir 7, and the packer 4 is arranged at the upper end of the oil and gas reservoir 7 on the casing 1.
The maximum diameter of the well-pigging steel wire tool or the testing tool string is smaller than the inner diameter of the oil pipe 2, and the problem of clamping caused by the too small inner diameter of the oil pipe 2 in the lowering process is avoided.
According to the dynamic monitoring scheme and the data logging plan of the oil reservoir department, the application aims at a gas well with high wax content of block condensate oil, complex fluid property of a shaft and easy occurrence of wax blockage and aromatic hydrocarbon blockage of the shaft as a target well to develop steel wire well testing operation.
In the process of lowering the test tool string or the pigtail wire tool string, oil wax on the inner wall of the oil pipe can form accumulation at the end part of the test tool string or the pigtail wire tool, as shown in a figure 3, a wax ring accumulation structure is formed, when the test tool string or the pigtail wire tool string is lowered and subjected to overlarge resistance, wax dissolving treatment is needed, particularly as shown in a figure 5, a wax dissolving agent is pumped between the tool string and the inner wall of the oil pipe, the wax ring between the tool string and the inner wall of the oil pipe is soaked and dissolved by the wax dissolving agent, pigtail work is completed, after the wax dissolving treatment is completed, the test tool string or the pigtail wire tool string smoothly reaches a set position, and then the test tool string or the pigtail wire tool string is lifted, so that the condition that the tool passes through diameter change is detected.
In the process of lowering the test tool string or the open well steel wire tool string, a tensile test is adopted to obtain whether the test tool string or the open well steel wire tool string meets resistance, and the method specifically comprises the following steps:
And after the set position is reached, the tension value of the current position testing tool string or the open well steel wire tool string is obtained, if the tension value of the current position testing tool string or the open well steel wire tool string is smaller than the set threshold value, whether the testing tool string or the open well steel wire tool string is blocked or not is indicated, and otherwise, no blocking is carried out.
In one embodiment of the application, the test tension is lifted every 100m from the set deep position (180-220 m), and the tension variation is calculated, so that the tool can be safely lifted out within the limit tension range.
The construction preparation is needed before the well test, namely, the preparation of a well testing winch, the preparation of blowout prevention equipment, the preparation of a downhole tool string, the installation of equipment and the pressure test.
The well testing winch is prepared by adopting sulfur-proof steel wires with diameter of 3.8mm as winch rollers, and the pulling force meets the construction requirement, and is used for hoisting the well-pigging steel wire tool string and the testing tool string.
The well testing winch is driven by a hydraulic driving device, and the hydraulic oil is required to be checked to be at a standard position, namely, the scale is more than 2/3.
The connecting pipelines of the well testing winch driving device are firm and have no leakage, and the power supply circuits are reliably connected and have no short circuit or circuit breaking;
The inspection well testing winch metering device is good, the tension is accurate, and each control valve member is flexible and easy to use;
and checking that the winch meets the operation requirement.
Preparing a blowout prevention device:
Selecting wellhead blowout prevention equipment with a pressure-resistant level of 105MPa or more;
performing base pressure test on blowout prevention equipment to ensure that the blowout prevention equipment is qualified;
The steel wire blowout preventer of blowout preventer equipment is ensured to be flexible to switch;
Installing and connecting blowout prevention equipment with a flange connector connected with a wellhead, so as to ensure the tightness of the connection;
The various control lines and hand pumps associated with the blowout preventer are ready for placement.
Preparing a downhole tool string, wherein the downhole tool string comprises a test tool string and a pigging wire tool string;
the pigging steel wire tool string comprises a steel wire rope cap, a universal joint, a weighting rod, a jar and a pigging gauge, and is hoisted by adopting a well testing winch to form the pigging steel wire tool string.
The test tool string comprises a steel wire rope cap, a weighting rod, a pressure gauge support barrel and a seating joint.
Preparing a steel wire rope cap matched with the steel wire, and fixing the steel wire screw cap at the front end of the pigging steel wire tool string;
Preparing a weighting rod with enough weight according to construction requirements, and checking the firmness of connection of the weighting rod;
the manometer is confirmed to be intact and undamaged within the calibration validity period, and is programmed according to the test requirements.
Shooting and retaining the steel wire tool string or the testing tool string of the pigtail well by a testing engineer before entering the well, recording and clearly determining the number, the size and the buckling type of the instrument, and confirming that the tool string or the testing tool string of the pigtail well can enter the well after being confirmed by a testing and monitoring technician in an operation area on site.
Mounting and pressure testing of equipment:
a. The well testing winch is placed at a position set from a well head, the distance between the well testing winch and the well head is set to be 15m-25m, and the center of a roller of the well testing winch is opposite to the well head;
b. Checking and connecting the blowout prevention pipeline and the testing tool string or the pigging steel wire tool string according to requirements;
c. the lubricator is connected with the choke tube in series (the lubricator with an emptying valve is connected to the lower end of the lubricator in series);
d. a connecting flange and a steel wire blowout preventer are arranged above the paraffin removal brake;
e. the pressure is tested to be 1.2 times of the pressure of the wellhead, stabilizing the pressure for 30min;
f. after the blowout prevention equipment is well butted with a wellhead, the ground anchor and the guy rope are fixed, and the pressure test pipeline is connected;
g. Pumping sealing grease to a wellhead by using a grease injection pump until the pressure of the wellhead is 1.2 times that of the wellhead, and sealing the blowout preventing equipment;
h. The wellhead blowout prevention equipment is subjected to pressure test by using a pressure test pump, the pressure is slowly pressed in a grading manner, each stage is stabilized for 5 minutes, the pressure of the last stage is stabilized for 15 minutes, and no leakage is detected to be qualified by using soapy water;
i. and after the pressure test is qualified, slowly opening a pressure release valve to release the pressure until the pressure is the same as the wellhead pressure, closing an inlet needle valve, and releasing the pressure of the pressure test pump to be zero.
And after the pressure test is qualified, the well-passing and testing work is carried out.
And after the pressure test is qualified, the pressure is released to the balance pressure, the test gate is slowly opened, and after the pressure in the lubricator and the pressure in the well are balanced, the blowout prevention system is ensured to be sealed and is not leaked, the blowout prevention system is completely opened, and the number of turns of the switch is accurately recorded as the normal basic number of the switch of the valve.
When the pigging steel wire tool string is put into the oil pipe 2 to carry out pigging, the lifting speed of the pigging steel wire tool string is required to be less than or equal to 10m/min from the wellhead within 50m, less than or equal to 15m/min from the position of variable diameter or the position of target 100m, and less than or equal to 70m/min in the lifting process;
when the well-logging steel wire tool string reaches the set position smoothly after the wax dissolving treatment is completed, then the well-logging steel wire tool string is lifted, the test tension is lifted every 100m from the set deep position (180-220 m) under the condition that the diameter of the tool is changed, the tension change amount is calculated, and the tool can be safely lifted out within the limit tension range.
Specifically, after the obstruction is encountered in the process of putting the pigging steel wire tool string into the well, the pigging steel wire tool string is placed at the obstruction-contacting position, and a wax dissolving agent is pumped between the pigging steel wire tool string and the inner wall of the oil pipe, so that the wax dissolving agent slides along a gap between the outer wall of the pigging steel wire tool string and the inner wall of the oil pipe, and the wax ring is dissolved by lifting and soaking, thereby solving the problem of wellbore obstruction and ensuring that the pigging steel wire tool string can be normally put into the well.
And putting in the test tool string, namely after the solvent lifting and soaking are successful, finishing the well-dredging process, taking out the well-dredging steel wire tool string, and then putting in the test tool string:
connecting and putting a testing tool string, namely sequentially connecting and fixing a steel wire rope cap (phi 38 mm), a weighting rod (phi 50 mm), a pressure gauge supporting cylinder (phi 45 mm) and a seating joint (phi 52 mm), then pulling or lifting the testing tool string into a lubricator, connecting the lubricator string with a steel wire blowout preventer, and testing pressure;
after the pressure test is qualified, the paraffin removal gate is completely opened, a testing tool string is put down, the gradient is measured, and the speed is not more than 50m/min;
when the test tool string reaches the set position smoothly after the wax dissolving treatment is completed, then the test tool string is lifted, the test tension is lifted every 100m from the set deep position (180-220 m) under the condition of reducing the diameter of the test tool string, the tension variation is calculated, and the test tool string can be safely lifted out within the limit tension range.
Specifically, after the test tool string is blocked in the falling process, the test tool string is placed at a blocking position, a wax dissolving agent is pumped between the test tool string and the inner wall of the oil pipe, so that the wax dissolving agent slides along a gap between the outer wall of the test tool string and the inner wall of the oil pipe, and the wax ring is dissolved by lifting and soaking, thereby solving the problem of blockage of a shaft and ensuring that the test tool string can be normally fallen.
Fishing out the test tool string:
The method comprises the steps of connecting a pressure gauge fishing tool string, namely a steel wire rope cap (phi 38 mm) +a tungsten steel weighting rod (phi 50 mm) +a jar (phi 45 mm) +JDC (phi 46 mm), pulling or lifting the testing tool string into a lubricator, connecting the lubricator string with a steel wire blowout preventer (BOP), then testing pressure, completely opening a paraffin removal gate after the pressure test is qualified, lowering the pressure gauge fishing tool to fish the pressure gauge, lifting a testing gradient after the pressure gauge is successfully fished, recovering a wellhead after the testing is finished, and finishing the testing. If the pressure gauge catches the test tool string and encounters resistance in the process of lowering, pumping wax dissolving agent between the tool string and the inner wall of the oil pipe, and soaking and dissolving a wax ring between the tool string and the inner wall of the oil pipe by utilizing the wax dissolving agent until the test tool is successfully caught, and finishing construction.
According to the well testing method for lifting and soaking the high-wax-content well solvent, the well logging steel wire tool string is placed into the oil pipe, after the well logging steel wire tool string is placed into the oil pipe and subjected to resistance, a wax dissolving agent is pumped between the well logging steel wire tool string and the inner wall of the oil pipe, the wax ring between the well logging steel wire tool string and the inner wall of the oil pipe is soaked and dissolved by the wax dissolving agent, well logging work is completed, the well logging steel wire tool string is taken out, then the testing tool string is placed into the oil pipe, after the testing tool string is placed into the oil pipe and subjected to resistance, the wax dissolving agent is pumped between the testing tool string and the inner wall of the oil pipe, the wax ring between the testing tool string and the inner wall of the oil pipe is soaked and dissolved by the wax dissolving agent, after the testing tool string reaches a set position for testing, the testing tool string is retrieved, the well testing work can be completed, a cavity dissolving structure is formed between the well logging steel wire tool string or the testing tool string and the inner wall of the oil pipe, the consumption of the wax dissolving agent is reduced, the wax dissolving agent is dissolved from the upper end of the wax ring, the first time of the well logging tool string can be greatly improved, the success rate of the testing tool string can be improved, the success rate of testing tool string can be lowered, and the success rate of testing is lowered, and the testing rate is lowered, and the success rate is lowered.
Claims (10)
1. The well testing method for lifting and soaking the high-wax-content well solvent is characterized by comprising the following steps of:
Putting the pigging steel wire tool string into an oil pipe, pumping a wax dissolving agent between the pigging steel wire tool string and the inner wall of the oil pipe when the pigging steel wire tool string is put into a block, soaking and dissolving a wax ring between the pigging steel wire tool string and the inner wall of the oil pipe by using the wax dissolving agent to finish pigging work, and taking out the pigging steel wire tool string;
And then placing the test tool string along the oil pipe, pumping a wax dissolving agent between the test tool string and the inner wall of the oil pipe after the test tool string is placed in a blocking state, soaking and dissolving a wax ring between the test tool string and the inner wall of the oil pipe by using the wax dissolving agent, and retrieving the test tool string after the test tool string reaches a set position for testing, so that the well testing work can be completed.
2. The method of claim 1, wherein the maximum diameter of the wire tool or string of tools is less than the inner diameter of the tubing.
3. The well testing method for lifting and soaking the high-wax-content well solvent according to claim 1, wherein a tensile test is adopted in the process of lowering the test tool string or the pigging steel wire tool string to obtain whether the test tool string or the pigging steel wire tool string is blocked.
4. A well testing method for lifting and soaking a high-wax-content well solvent according to claim 3, wherein after the set position is reached, the tension value of the test tool string or the pigtail wire tool string at the current position is obtained, if the tension value of the test tool string or the pigtail wire tool string at the current position is smaller than the set threshold value, whether the test tool string or the pigtail wire tool string encounters resistance is indicated, otherwise, whether the test tool string or the pigtail wire tool string encounters resistance is not detected.
5. The method of claim 1, wherein the pressure test is performed on a blowout preventer installed at a wellhead prior to the well test.
6. The well testing method for lifting and soaking the high-wax-content well solvent according to claim 1, wherein the well testing method is characterized in that after the pressure test is qualified, the pressure is released to the balance pressure, and after the pressure in the blowout prevention pipe is balanced with the pressure in the well, the well is completely opened under the condition that the blowout prevention system is ensured to be sealed and free from leakage.
7. The well testing method for lifting and soaking the high-wax-content well solvent according to claim 1, wherein when the well dredging steel wire tool string is put into an oil pipe to dredge a well, the speed is not more than 10m/min within 50m from a well head in the descending process, and the speed is not more than 15m/min at a position 100m from a reducing position or a target position.
8. The method of claim 1, wherein the speed of lifting the string of well logging tools from the tubing is no more than 70m/min.
9. The well testing method for lifting and soaking the high-wax-content well solvent according to claim 1, wherein when the test tool string is put into an oil pipe for well dredging, the speed is not more than 10m/min within 50m from a wellhead in the descending process, and the speed is not more than 15m/min at a position 100m from a reducing position or a target position.
10. The method of claim 1, wherein the string of test tools is lifted from the tubing at a rate of no more than 70m/min.
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| CN202731848U (en) * | 2012-05-15 | 2013-02-13 | 中国石油天然气股份有限公司 | Downhole electrothermal plugging removal device for high pressure oil and gas wells |
| CN202578589U (en) * | 2012-06-12 | 2012-12-05 | 中国石油天然气股份有限公司 | Multi-functional pipe string with well cleaning, testing and layered water injection |
| US20190112892A1 (en) * | 2015-04-28 | 2019-04-18 | Thru Tubing Solutions, Inc. | Flow control in subterranean wells |
| CN108131118A (en) * | 2016-11-30 | 2018-06-08 | 中国石油天然气股份有限公司 | Test well integration tool |
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