CN102720453B - Method and device for mechanically removing sand and draining liquid from pit shaft of oil/gas well in underbalanced state - Google Patents

Method and device for mechanically removing sand and draining liquid from pit shaft of oil/gas well in underbalanced state Download PDF

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Publication number
CN102720453B
CN102720453B CN201210180543.7A CN201210180543A CN102720453B CN 102720453 B CN102720453 B CN 102720453B CN 201210180543 A CN201210180543 A CN 201210180543A CN 102720453 B CN102720453 B CN 102720453B
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gas
liquid
sand
oil
separator
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CN102720453A (en
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杨勇华
杨茂华
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SICHUAN GUANGMANG NEW ENERGY CO., LTD.
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SUINING CITY HUAXU TECHNOLOGY Co Ltd
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Abstract

The invention discloses a method and device for mechanically removing sand and draining liquid from a pit shaft of an oil/gas well in an underbalanced state. In the underbalanced state, kinetic energy of working solution is converted into mechanical energy of a spiral drill bit, and a sand body is cut and lifted and then returns to the ground along with the working solution; and after sand is removed, liquid drainage process gas is injected into the pit shaft to drain accumulation liquid in the pit shaft, so that production of the oil/gas well can be restored. According to the method and device for removing sand and draining liquid, the velocity pressure of a working solution column is lower than the formation pressure during the sand removal process, so that the working solution is prevented from leaking effectively, and pollution to the formation can be reduced; kinetic energy of the working solution is converted into mechanical energy of the spiral drill bit, and the sand body depositing in the pit shaft is cut and lifted, so that formation damage caused by hydrodynamic impact can be prevented effectively, and complex circumstance of the formation can be prevented from being induced; and a gas injection auxiliary liquid drainage device is adopted to discharge working solution in the well, so that formation energy can be activated step by step advantageously, steady flow state of gas, liquid and oil can be established, and production of the oil/gas well can be restored quickly.

Description

The desanding of oil, Wellbore of Gas Wells underbalance machinery, fluid-discharge method and device
Technical field
The invention belongs to oil field development equipment technical field, relate to a kind of oil, Wellbore of Gas Wells mechanical desanding, fluid-discharge method and device under under-balanced state.
Background technology
In oilfield development process, the sand carried in oil, natural gas, dirt particulate can be assembled, be deposited in pit shaft; Particularly for siltstone and argillaceous siltstoue, there is undercompaction, poor diagenetic grade, loose cementation, high clay, high shale content, high salinity, stratum that sensitiveness is strong, shake out in production of hydrocarbons process comparatively serious; The Oil/gas Well of the strong excavating technology of employing forced-ventilated and the Oil/gas Well of long-term injecting water or gas injecting mining, come to harm due to earth formation or reservoir skeleton is destroyed, and all can aggravate to shake out.According to the introduction of relevant oil gas field data, the oil shaked out, gas well sand setting speed reach 44.07 ~ 100 meters/year.Oil, Wellbore of Gas Wells amass sand, progressively can bury payzone, cause oil, gas well reduce or stop production.
Oil, Wellbore of Gas Wells desanding are the problems that must face in oil, gas Development and Production.
At present, petroleum-gas fiedl generally adopts hydraulic sand washing, comprises coiled tubing sand washing and injector head sand washing.The defect of this technology is high pressure, huge discharge sand washing can injure, pollute stratum, for strata pressure low or have the oil of leakage, gas well endanger more serious, for oil, the gas well of geologic structure fragility, also can cause serious down hole problem, even cause payzone to collapse.
In recent years the sand bucket developed, be subject to the influence factors such as hole deviation, submergence, sand surface hardness, long-pending sand tight ness rating more, application is restricted.
Field practice illustrates, considerable oil, Wellbore of Gas Wells amass sand under the pressure effect of a period of time, assembles and becomes compactness sand post; Some oil wells (particularly viscous crude) pit shaft amasss sand and colloid, waxy component coacervation, becomes the sand knurl, the sand post that have intensity, flexible; The problems referred to above make sand washing, take out sand work becomes more difficult.Meanwhile, effective fluid-discharge technology is not had after existing sand washing operation.Petroleum-gas fiedl geologic structure of shaking out is natively very fragile, adopts high pressure gaslift or liquid nitrogen cleanup, and meeting formation impacts, disturbance, brings out complex formation situation, is more unfavorable for that gas, water, oily stabilization of fluidized are set up in stratum, may causes going into operation unsuccessfully.
Summary of the invention
The object of the invention is to for above-mentioned the deficiencies in the prior art, a kind of oil, Wellbore of Gas Wells mechanical desanding, fluid-discharge method and device under under-balanced state are provided, can do not destroy earth formation, do not pollute stratum prerequisite under, solve the long-pending sand problem in oil, Wellbore of Gas Wells, provide effective fluid-discharge technology simultaneously, and realize recycling of working solution and process gas.
For achieving the above object, the technical scheme that the present invention takes is: provide a kind of oil, Wellbore of Gas Wells mechanical desanding, fluid-discharge method under under-balanced state, it is characterized in that: under under-balanced state, by being the mechanical energy of augers by the kinetic transformation of working solution, in order to cutting, lifting sand body, and return to ground with working solution; Desanding completes backward pit shaft and injects hydrops in fluid-discharge technology gas discharge pit shaft, recovers oil, gas well liquid loading.
Described working solution is low-density working solution, and make working solution fluid column dynamic pressure in pit shaft lower than strata pressure, operation process is in under-balanced state; Described working solution is foam or fluffy mud.
The working solution of discharging described pit shaft is reused for oil, gas well desanding operation after being separated with sand body.
Described fluid-discharge technology gas is transported in pit shaft for discharging hydrops in pit shaft after being separated again through gas, liquid; Described fluid-discharge technology gas is natural gas or nitrogen.
A kind of oil, Wellbore of Gas Wells mechanical desanding, pumping equipment under under-balanced state, comprise Hydraulic pump, applications of coiled tubing unit, desanding device, gas injection assist pumping equipment, sand liquid/gas separator and gas-liquid separator; Sand deposition tube section operation in down-hole oil tube delivered to by desanding device by the coiled tubing that described applications of coiled tubing unit is arranged; Described applications of coiled tubing unit is connected with production tree; Described sand liquid/gas separator is connected with Hydraulic pump; Described gas-liquid separator and gas injection assist pumping equipment to be connected; Described coiled tubing assists pumping equipment to be connected with Hydraulic pump and gas injection respectively; Described gas-liquid separator is connected with sand liquid/gas separator.
Described desanding device comprises fluid motor; Pressure reduction torsion balancer is provided with above described fluid motor; Described fluid motor lower end is provided with augers.
Described sand liquid/gas separator is connected with sand liquid return line; Described gas-liquid separator is connected with gas-liquid return line; Described gas-liquid return line is connected with sand liquid return line; Described sand liquid return line is connected with production tree.
Described gas-liquid separator is connected with sand liquid/gas separator by blowdown pipeline; Described gas-liquid separator is also provided with admission line.
Described Hydraulic pump is connected with coiled tubing by fluid power pipeline; Described gas injection assists pumping equipment to pass through high pressure gas pipeline to be connected with coiled tubing.
The mechanical desanding that the present invention adopts is the mechanical force cutting of augers, damaged sand body by the kinetic transformation of working solution, and lifting sand body and the mixture that formed with working solution.
The gas injection that the present invention adopts assists pumping equipment to be that the applicant applied in 2010, the gas injection assisted drainage gas production unit provided in the patent that the patent No. is CN201020614971.2.This gas injection assisted drainage gas production unit comprises well site natural gas treatment plant and gas injection unit; Gas injection unit comprises natural gas engine, fluid clutch, natural gas boosting machine and flow process and control system; Well site natural gas treatment plant comprises defoaming treatment device, combination trap, meticulous desulfurization treating apparatus and regulator.Gas injection assists pumping equipment to take pipe network natural gas or nitrogen as process gas, by the bottom of coiled tubing Injection Well after supercharging, takes liquid and returns to ground, progressively gets rid of hydrops in pit shaft, activates stratum energy; The process gas returned is reusable after separating treatment, and auxiliary discharge opeing, until stablize gas, liquid, oily fluidised form, recovers oil, gas well liquid loading.
The desanding of oil provided by the invention, Wellbore of Gas Wells underbalance machinery, fluid-discharge method and device have following beneficial effect:
1, in desanding operation process, keep the dynamic pressure of working solution fluid column lower than strata pressure, thus effectively prevent working solution seepage, reduce the pollution of formation;
2, by the kinetic energy of working solution be augers mechanical energy cutting, lifting pit shaft sedimentary sand bodies, effectively prevent the impact of high pressure liquid stream formation, avoid formation damage and bring out complex formation situation;
3, adopt gas injection to assist pumping equipment to discharge working solution in well, be conducive to progressively activating stratum energy, set up gas, liquid, oily stabilization of fluidized, recover rapidly oil, gas well liquid loading;
4, achieve recycling of working solution and process gas, there is good economic benefit and social benefit;
5, in addition, there is practicality widely, be generally applicable to the desanding of straight well, inclined shaft and horizontal well, discharge opeing operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of oil, the desanding of Wellbore of Gas Wells underbalance machinery, pumping equipment.
Wherein, 1, Hydraulic pump; 2, fluid power pipeline; 3, coiled tubing; 4, oil pipe well head fastening devices; 5, production tree; 6, sand liquid return line; 7, down-hole oil tube; 8, pressure reduction torsion balance ball; 9, positive displacement fluid motor; 10, augers; 11, sand liquid/gas separator; 12, pumping equipment is assisted in gas injection; 13, high pressure gas pipeline; 14, gas-liquid separator; 15, admission line; 16, gas-liquid return line; 17, blowdown pipeline.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail, but they are not to further restriction of the present invention.
The invention provides a kind of oil, Wellbore of Gas Wells mechanical desanding, fluid-discharge method under under-balanced state: under under-balanced state, by being the mechanical energy of augers by the kinetic transformation of working solution, in order to cut sand body, drag for sand, to lift sand, and return to ground with working solution, improve desanding efficiency, and avoid injury and the pollution of highly pressurised liquid formation; Desanding completes backward pit shaft and injects hydrops in fluid-discharge technology gas discharge pit shaft, recovers oil, gas well liquid loading.
Above-mentioned working solution is low-density working solution, different according to stratum composition, selects suitable working solution, and meet working solution fluid column dynamic pressure in pit shaft lower than strata pressure, operation process is in under-balanced state; For the oil, the Wellbore of Gas Wells inner product sand that have glue, wax to condense component, the working solution of selection also has parsing, corrosion and dilution function; Working solution can select foam or fluffy mud; The working solution of discharging pit shaft is reused for oil, gas well desanding operation after being separated with sand body.
Above-mentioned fluid-discharge technology gas is transported in pit shaft for discharging hydrops in pit shaft after being separated again through gas, liquid; Above-mentioned fluid-discharge technology gas is natural gas or nitrogen.
As shown in Figure 1, this oil, Wellbore of Gas Wells mechanical desanding under under-balanced state, pumping equipment comprise Hydraulic pump 1, pumping equipment 12, sand liquid/gas separator 11 and gas-liquid separator 14 and fluid reservoir are assisted in applications of coiled tubing unit, desanding device, gas injection.
Applications of coiled tubing unit comprises coiled tubing 3, wellhead assembly and blowout preventer device; Applications of coiled tubing unit is connected with production tree 5 by oil pipe well head fastening devices 4, the conveying of liquid of finishing the work, fluid-discharge technology gas and make a trip, send the operations such as brill, loading.
Sand liquid/gas separator 11 is all connected with production tree 5 with gas-liquid separator 14; Particularly, sand liquid/gas separator 11 is connected with sand liquid return line 6; Gas-liquid separator 14 is connected with gas-liquid return line 16; Gas-liquid return line 16 is connected with sand liquid return line 6; Sand liquid return line 6 is connected with production tree 5.
Sand liquid/gas separator 11 is connected with Hydraulic pump 1; Gas-liquid separator 14 and gas injection assist pumping equipment 12 to be connected; Coiled tubing 3 assists pumping equipment 12 to be connected with Hydraulic pump 1 and gas injection respectively, and particularly, Hydraulic pump 1 is connected with coiled tubing 3 by fluid power pipeline 2, and gas injection assists pumping equipment 12 to be connected with coiled tubing 3 by high pressure gas pipeline 13.
Gas-liquid separator 14 is connected with sand liquid/gas separator 11, and particularly, gas-liquid separator 14 is connected with sand liquid/gas separator 11 by blowdown pipeline 17.Gas-liquid separator 14 is also provided with admission line 15.
Coiled tubing 3 is connected with desanding device (8,9,10); Desanding device comprises positive displacement fluid motor 9; Pressure reduction torsion balancer 8 is provided with above positive displacement fluid motor 9; Positive displacement fluid motor 9 lower end is provided with augers 10.In the present embodiment, positive displacement fluid motor 9 also can with the liquid of other form, dynamic conversion equipment, and core can change liquid into mechanical energy, meets moment of torsion, rotating speed and locus requirement simultaneously.
Fluid power pipeline 2, high pressure gas pipeline 13, gas-liquid return line 16, blowdown pipeline 17 and enter sand liquid/gas separator 11 pipeline on be provided with valve.
Use the desanding of this oil, Wellbore of Gas Wells underbalance machinery, pumping equipment to oil, Wellbore of Gas Wells carry out desanding, discharge opeing comprises the following steps:
A, working solution are after Hydraulic pump 1 supercharging, by pressure line 2, coiled tubing 3, partial power is flowed to desanding device (comprising pressure reduction torsion balancer 8, positive displacement fluid motor 9 and augers 10), working solution forms certain pressure differential in the import and export of positive displacement fluid motor 9, drive rotor rotates around the axis of stator, and rotating speed and moment of torsion are exported by universal drive shaft, drive augers 10 to rotate, cutting, convolution, lifting sand body; When positive displacement fluid motor 9 is under load condition, the plunger that working solution pressure reduction promotes pressure reduction torsion balancer 8 pushes against oil pipe tube wall, the reaction torque produced when balancing volume formula fluid motor 9 works; Carry again sand body in pit shaft crack after sand grains, the annular space formed by down-hole oil tube 7 and coiled tubing 3 and sand liquid return line 6, enter sand liquid/gas separator 11; Now, fluid power pipeline 2, the valve open entered on the pipeline of sand liquid/gas separator 11, the valve closing on high pressure gas pipeline 13, gas-liquid return line 16 and blowdown pipeline 17;
B, in sand liquid/gas separator 11, realize being separated of sand body and working solution; Working solution after separation enters Hydraulic pump 1 and recycles; As required, coiled tubing 3 supplements working solution from fluid reservoir;
After C, desanding complete, fluid power pipeline 2, the valve closing entered on the pipeline of sand liquid/gas separator 11, the valve open on high pressure gas pipeline 13, gas-liquid return line 16 and blowdown pipeline 17; The fluid-discharge technology gas inputted by admission line 15 enters gas injection through gas-liquid separator 14 and assists pumping equipment 12, after the supercharging of fluid-discharge technology gas, inputs in pit shaft, hydrops in lifting pit shaft by high pressure gas pipeline 13, coiled tubing 3;
In D, pit shaft, fluid-discharge technology gas carries annular space that hydrops formed by down-hole oil tube 7 and coiled tubing 3, sand liquid return line 6, gas-liquid return line 16 enter gas-liquid separator 14; Fluid-discharge technology gas after gas-liquid separator 14 is separated enters gas injection and assists pumping equipment 12 to recycle; As required, fluid-discharge technology gas is supplemented by admission line 15; Hydrops after gas-liquid separator 14 is separated, according to whether having other liquid output object, determines further treatment measures; If containing fluid in hydrops, collect isolated fluid; If not containing fluid in hydrops, then performance looked by hydrops, can save as the working solution of lower a bite well or carry out harmless treatment.
It should be noted that depositing sand and will regularly remove in eliminator 11.
Such scheme is the preferred forms that the present invention takes; but the present invention does not limit to and above-mentioned embodiment; for those skilled in the art; under the premise without departing from the principles of the invention; be easy to carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.

Claims (3)

1. oil, Wellbore of Gas Wells mechanical desanding, a pumping equipment under under-balanced state, is characterized in that: comprise Hydraulic pump, applications of coiled tubing unit, desanding device, gas injection assist pumping equipment, sand liquid/gas separator and gas-liquid separator; Described desanding device comprises fluid motor; Pressure reduction torsion balancer is provided with above described fluid motor; Described fluid motor lower end is provided with augers; Sand deposition tube section operation in down-hole oil tube delivered to by desanding device by the coiled tubing that described applications of coiled tubing unit is arranged; Described applications of coiled tubing unit is connected with production tree; Described sand liquid/gas separator is connected with Hydraulic pump; Described gas-liquid separator and gas injection assist pumping equipment to be connected; Described coiled tubing assists pumping equipment to be connected with Hydraulic pump and gas injection respectively; Described gas-liquid separator is connected with sand liquid/gas separator; Described sand liquid/gas separator is connected with sand liquid return line; Described gas-liquid separator is connected with gas-liquid return line; Described gas-liquid return line is connected with sand liquid return line; Described sand liquid return line is connected with production tree.
2, oil according to claim 1, Wellbore of Gas Wells mechanical desanding, pumping equipment under under-balanced state, is characterized in that: described gas-liquid separator is connected with sand liquid/gas separator by blowdown pipeline; Described gas-liquid separator is also provided with admission line.
3, oil according to claim 1, Wellbore of Gas Wells mechanical desanding, pumping equipment under under-balanced state, is characterized in that: described Hydraulic pump is connected with coiled tubing by fluid power pipeline; Described gas injection assists pumping equipment to pass through high pressure gas pipeline to be connected with coiled tubing.
CN201210180543.7A 2012-06-04 2012-06-04 Method and device for mechanically removing sand and draining liquid from pit shaft of oil/gas well in underbalanced state Active CN102720453B (en)

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CN106014326A (en) * 2016-05-23 2016-10-12 中国石油集团川庆钻探工程有限公司 Sand removal system and technology used for washing settled sand of nitrogen drilled well wellhead blowout preventer
CN105840127B (en) * 2016-05-30 2018-09-04 泸州长江石油工程机械有限公司 Double layer continuous oil pipe sand pumping device and technique
CN107989578B (en) * 2016-10-27 2020-04-10 中国石油天然气股份有限公司 Liquid discharge system and method of recyclable nitrogen jet pump of coiled tubing
CN106593329B (en) * 2016-12-20 2019-08-30 库尔勒施得石油技术服务有限公司 Gas lift reverse circulation negative pressure sand removal method and fettling installation
CN107143296B (en) * 2017-05-09 2019-11-22 中国石油化工股份有限公司华北油气分公司石油工程技术研究院 A kind of horizontal gas well negative pressure fishing sand method, horizontal gas well negative pressure fish out sand system
CN108930526A (en) * 2017-05-25 2018-12-04 中国石油天然气股份有限公司 A kind of recyclable nitrogen continuous draining system and method
CN111021970B (en) * 2019-12-27 2022-03-22 东营汇聚丰石油科技有限公司 Operation device and method for cleaning near-well polluted zone of coal-bed gas well
CN111561299B (en) * 2020-05-26 2022-05-17 中海石油(中国)有限公司 Liquid drainage and gas production operation system and operation method suitable for engineering ship
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Effective date of registration: 20160411

Address after: 618200 Jiangsu Industrial Park, Mianzhu, Sichuan, Deyang

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Patentee before: Suining City Huaxu Technology Co., Ltd.