CN102635337B - Rapid gas production method implemented after coiled tubing is put in gas well - Google Patents
Rapid gas production method implemented after coiled tubing is put in gas well Download PDFInfo
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Abstract
The invention discloses a rapid gas production method implemented after coiled tubing is put in a gas well, which is applied to the rapid brought-in of water pumping gas production of the coiled tubing. After a coiled-tubing well is subjected to wellhead reconstruction and recovery, eight control valves and two pressure gauges are commonly controlled, and the gas well has three production processes of casing, tubing-tubing annulus, coiled tubing and the like. By using the rapid gas production method implemented after coiled tubing is put in a gas well, the falling-off of a plug and the opening of the gas well are completed. The method has the effects that: through using a rapid brought-in process of coiled tubing, a construction process is optimized, construction procedures are simplified, and two processes of the falling-off of the plug and the opening of the gas well are combined into a whole, therefore, a complex process of beating away the plug is omitted, and an operation that the plug falls off and an operation of opening the well to carry out gas production can be completed in one step.
Description
Technical field
The present invention relates to operation method after natural gas well completion, a kind of particularly water pumping gas production method being lowered in gas well after coiled tubing, is that a kind of gas well is lowered to the quick gas production method of coiled tubing.
Background technology
At present, coiled tubing water drainage-gas recovery technology is exactly the principle of utilizing different tube diameters critical liquid carrying flow rate different, selects rational flow string caliber, thereby reaches the production requirement that meets gas well and independently take liquid.Owing to utilizing coiled tubing work vehicle to carry out before not kill-job coiled tubing is thrown in operation one of the artificial installation in coiled tubing bottom blanking plug, preventing from altering on bottom pressure and causing natural gas to leak in work progress.Therefore, before coiled tubing comes into operation, must take certain measure to destroy this blanking plug, guarantee that coiled tubing production procedure is unimpeded.
Conventional coiled tubing operation technique is divided into two procedures.The one, adopt gases at high pressure to destroy coiled tubing bottom blanking plug: after the transformation of coiled tubing Well head flow path recovers, connect high pressure steel tubulation line (or flexible pipe) at test gate valve top, open machine and add nitrogen carrier gas car (or compression locomotive) and inject high pressure nitrogen (or natural gas) in coiled tubing, in the time that blanking plug upper pressure is greater than base pressure, blanking plug comes off, and coiled tubing flow process can meet working condition; The 2nd, after switching Well head flow path, organize gas well to produce: after coiled tubing bottom blanking plug comes off, the production procedure of conducting coiled tubing, opening well and making production, observe gas well pressure changing, again determine whether blanking plug comes off, admission relevant parameter, completes coiled tubing operation work.
Finding through on-the-spot a large amount of application, there is the shortcoming of following several respects in conventional coiled tubing operation technique: (1) complex process, and nitrogen car need to be replaced and two vehicle coordinating operations of supercharging, and equipment and process pipelines are installed and are taken time and effort; (2) operating cost is high, equipment leasing, maintenance, and oil product consumption, vehicle expense, labour cost cost are higher, and average individual well invests approximately 5.0 ten thousand; (3) construction risk is high, owing to being subject to restriction and the impact of technique, has the multinomial risks such as the leakage of pipeline thorn, falling from high altitude, pipeline superpressure, mechanical wounding; (4) the tissue cycle long, because equipment, personnel's job placement have uncertainty, organize excessive cycle, will cause gas well not go into operation as early as possible, affect output performance.
Summary of the invention
The object of the invention is: provide a kind of gas well to be lowered to the quick gas production method of coiled tubing, blanking plug is come off and simplified with gas well operation two procedures, remove routine and destroy numerous and diverse operation of blanking plug, disposablely complete that blanking plug comes off and two work of opening well and making production, so reach simplify technique, raise the efficiency, the shortening cycle, cost-saving, low-risk object falls.
1, the present invention adopts the principle of technical scheme to be: the metallization processes that conforms to the principle of simplicity, cost-saving, reduce risk, the aspect such as increase the benefit starts with, and optimizes conventional coiled tubing operation technique, the creationary coiled tubing technique of going into operation fast that proposed.The pressure reduction requirement coming off according to blanking plug, adopt the mode of reverse thinking, mode constant conventional bottom pressure, that blanking plug is destroyed in pressurising to coiled tubing is changed into coiled tubing is inner keeps the mode that high pressure is constant, shaft bottom is carried out to pressure release, realized that coiled tubing blanking plug comes off and the dual purpose of opening well and making production, the process reform that is about to rely on external pressure to destroy blanking plug is to rely on gas well self pressure and energy to realize the object of destroying blanking plug.
2, blanking plug Pro-drop Parameter is determined: blanking plug comes off and is subject to the impact of three active forces, i.e. the frictional force f of its upper pressure Fs, bottom pressure Fx and blanking plug and coiled tubing tube wall,
In the time of Fs > Fx+f, blanking plug is tear-away, meets operation condition.
The calculating of blanking plug top and the bottom pressure is converted according to static gas column pressure,
Static gas column calculation of pressure
In formula: Pws is the bottom pressure that static gas column method is calculated, MPa; Pts is static gas column well head pressure, MPa; Yg is gas relative density; H is that well head is to the gas-bearing formation middle part degree of depth, m; T is gas average absolute temperature in pit shaft, K, T=(Tts+Tws)/2; Tts, Tws represent respectively well head, the shaft bottom absolute temperature K of static gas column, Tws=273.15+0.03*H; Z is wellbore gas average compression coefficient, and Z=(Zts+Zws)/2, gets 0.85; Ztsc, Zws represent respectively the gas compressibility factor under static gas column well head, downhole condition.
Calculate for simplifying, special hypothesis (1) drives a well in pressure leak process, and casing pressure Pt fall off rate is low, and in sleeve pipe, gaseous state is assumed to be static gas column, and under primary condition, casing pressure Pt equals coiled tubing constant pressure Pl; (2) the long-pending Ss=Sx of blanking plug upper and lower surface; (3) the frictional force f of blanking plug and coiled tubing tube wall is constant.
, Fs > Fx+f
Ps*Ss＞Px*Sx+f
Can obtain according to three assumed conditions:
As Ps-Px > f/S, while being greater than certain certain value, blanking plug comes off.Known according to static gas column formula, Ps-Px=(Pl-Pts)
in formula, Pts meets the surface casing pressure that blanking plug comes off.
When the coiled tubing input degree of depth is 3350 meters,
: Ps-Px=1.65 (Pl-Pts).As can be seen here, when the pressure reduction that comes off of blanking plug can come off by coiled tubing internal pressure and blanking plug, poor 1.65 times of surface casing pressure reflect.
3, gas well is lowered to the indoor checking of the quick gas production method of coiled tubing: in order further to determine the pressure reduction requirement that blanking plug comes off, carried out repeatedly laboratory experiment.Experimental technique and step are:
(1) prepare one and be about one of the coiled tubing of 10 meters, and be fixed on handling frame;
(2) simulated field blanking plug installation process, the groove of polishing coiled tubing one end, smears stop-leak compound, and blanking plug is installed, and through repeatedly attempting guaranteeing that blanking plug and tube wall fit tightly, favorable sealing property;
(3) the coiled tubing other end is connected to pressure-air inflator, guarantees that joint is tight;
(4) enable inflator, control loading velocity well, be slowly filled with gases at high pressure to coiled tubing inside;
(5) close observation inflator outlet pressure and blanking plug situation of change, every a force value of 1 minute record, until blanking plug comes off, completes experimental project.
Find through simulated experiment repeatedly, the blanking plug that the install coiled tubing bottom needed upper and lower end face pressure reduction that comes off is 2 MPas.The general casing pressure shut-in of gas well that coiled tubing water pumping gas production test is carried out at scene is 10～12 MPas, and after driving a well, casing pressure is generally 3～5 MPas, and minimum differential pressure is 5 MPas, meets the requirement of pressure reduction 2 MPas that come off of blanking plug.
4, adopt gas well to be lowered to the gas well casing programme of the quick gas production method of coiled tubing: comprise sleeve pipe, oil pipe, coiled tubing, blanking plug, hydraulic anchor, packer and artificial bottom of a well composition, described sleeve pipe is by surface pipe and production casing.The top of production casing is fixed on well head by casing hanger, artificial bottom of a well is arranged at the bottom at production casing, in production casing, be lowered to oil pipe, the top of oil pipe is fixed on well head by boll-weevil hanger, between the lower end outer wall of oil pipe and production casing inwall by packer packing every, oil pipe is fixed by hydraulic anchor on the top of packer and between production casing and oil pipe; In oil pipe, be lowered to coiled tubing, the top of coiled tubing is fixed in slips hanger, and slips hanger is arranged on master control gate valve by flange connect and produces between gate valve the annular space between slips hanger sealing oil pipe and coiled tubing.There is blanking plug the lower end of coiled tubing; Boll-weevil hanger is in order to hang the annular space between OIH pipe and sealing oil pipe and production casing 12;
5, adopt gas well to be lowered to the quick gas production method of coiled tubing, the gas well mouth device of employing, comprises christmas tree; Christmas tree is fixed on the top of production casing, the both sides of the big four of christmas tree bottom are distinguished splicing sleeve by flange and are produced gate valve and sleeve pipe pressure control gate valve, at the other end splicing sleeve pressure meter of sleeve pipe pressure control gate valve, casing pressure table is in order to read casing pressure value.The other end of producing gate valve at sleeve pipe is connected with sleeve pipe production flow line; The top of christmas tree big four connects master control gate valve by flange; The top of master control gate valve is by flange connecting tee formula slips hanger, and a side of slips hanger connects the empty gate valve of producing of oil ring by flange, and the empty other end of producing gate valve of oil ring is connected with the empty production flow line of oil ring; The top of slips hanger is connected and is produced gate valve by flange, the top that produces gate valve connects little four-way, the top of little four-way is by flange connecting test gate valve, one side of little four-way is by plug sealing, little four-way opposite side connects coiled tubing by flange and produces gate valve, and the other end that coiled tubing is produced gate valve is connected with coiled tubing production flow line; Sleeve pipe production flow line, the empty production flow line of oil ring and coiled tubing production flow line are communicated with by vertical tube line (high pressure header); On vertical tube line, be fixed with tubing gauge, tubing gauge, in order to read oil pressure value, is connected with horizontal production flow line on vertical tube line, laterally on production flow line, is connecting a pin type choke valve.
The model that christmas tree adopts is KQ65-70 type, master control gate valve, sleeve pipe production gate valve, sleeve pipe pressure control gate valve, production gate valve, the empty model of producing gate valve, test gate valve, coiled tubing production gate valve of oil ring are XFF65-70 type, the model of pin type choke valve is JLK45-70 type, and sleeve pipe production flow line, the empty production flow line of oil ring, coiled tubing production flow line, vertical tube line and the model that laterally production flow line adopts are DN65.
6, gas well is lowered to the quick gas production method of coiled tubing, carries out according to the following steps:
The on off state of steps A, the each valve of inspection christmas tree, sleeve pipe is produced gate valve, empty gate valve, test gate valve, coiled tubing production gate valve and the pin type choke valve produced of oil ring cuts out; Sleeve pipe pressure control gate valve aperture is full-gear 1/3, guarantees that casing pressure value can normally read; Master control gate valve and produce gate valve in full-gear, and hang " forbid operation " warning sign, prevents from damaging when maloperation from closing coiled tubing;
Step B, open sleeve pipe produce gate valve, read oil pressure value by tubing gauge;
Step C, open coiled tubing produce gate valve, utilize source of the gas in sleeve pipe (after sleeve pipe produces gate valve and coiled tubing and produce gate valve and open, sleeve pipe is communicated with coiled tubing production procedure) to pressurising in coiled tubing, until the casing pressure balance that coiled tubing internal pressure and casing pressure table show makes inner this force value that keeps of coiled tubing;
Step D, close sleeve pipe and produce gate valve and coiled tubing and produce gate valve, coiled tubing internal pressure remains unchanged; Open the empty gate valve of producing of oil ring, and utilize pin type choke valve reducing pressure by regulating flow opening well and making production, check force value shown in tubing gauge and casing pressure table, tubing pressure continuous decrease, casing pressure is slow decreasing thereupon, and tubing pressure fall off rate is greater than casing pressure fall off rate; In this process, the blanking plug upper and lower end face pressure reduction that is arranged on coiled tubing bottom constantly increases; Be that blanking plug upper surface pressure-bearing is coiled tubing internal pressure and remains unchanged, lower surface pressure-bearing is bottom pressure and slow decreasing.
Step e, by tubing gauge and apparent oil, the casing pressure value table trend examined of casing pressure, every 5 minutes admission gas well creation datas once, the parameter of admission comprises tubing pressure, casing pressure, instant productivity, outer defeated pressure etc., in the time that casing pressure rises to 8.3 MPas (casing pressure go up 0.1 MPa) by 8.2 MPas, be tentatively judged as blanking plug and come off;
Step F, close empty gate valve and the pin type choke valve produced of oil ring, open coiled tubing and produce gate valve, check the casing pressure value of oil pressure value and the casing pressure table of tubing gauge, if when oil pressure value is less than inner initial pressure 11.3 MPas of coiled tubing or approximates real-time casing pressure value 8.3 MPa, judge that blanking plug comes off;
Step G, again open pin type choke valve reducing pressure by regulating flow opening well and making production (now conducting of coiled tubing flow process), until oil pressure value drops to after outer defeated pressure 1.2 MPas of gas well, standard-sized sheet pin type choke valve carries out normal gas production production.
Beneficial effect of the present invention: gas well of the present invention is lowered to the quick gas production method of coiled tubing, for the coiled tubing technique of going into operation fast, mainly carry out analysis and evaluation from five aspects such as technology mode, economic benefit, construction working amount, duty cycle, Risk Identifications.
1, technology mode: construction technology that coiled tubing has been gone into operation process optimization fast, simplify working procedure, blanking plug is come off and gas well operation two procedures unites two into one, numerous and diverse operation of removing routine and destroying blanking plug, disposablely completes that blanking plug comes off and two work of opening well and making production;
2, economic benefit: by the comparative analysis of technology that conventional coiled tubing operation technique and coiled tubing are gone into operation fast, consider the each side factors such as equipment leasing, equipment depreciation, oil product consumption, vehicle expense, cost of labor, conventional blanking plug exfoliation process individual well operating expenses is 5.0 ten thousand/well.Go into operation technique fast under low-risk, short-period prerequisite through the coiled tubing of optimizing after improving, realized zero investment.Later stage Soviet Union's Sulige gas field operation individual well will be broken through 10000 mouthfuls, adopt coiled tubing water drainage-gas recovery technology gas well by the scale prediction of total well number 1%, coiled tubing is gone into operation fast in the application process of technique and will be saved 5,000,000 yuan of cost of production in the coming years, economic benefits, has application value and space widely.
3, construction working amount: the coiled tubing technique of going into operation has fast been removed conventional operation of destroying blanking plug, thereby has reduced the extensive works such as nitrogen car (or compression locomotive) removal of home, maintenance, installation, debugging;
4, duty cycle: conventional coiled tubing operation technique supercharging vehicle is organized and coordinated more difficult, long between the stopping times such as construction, individual well construction period approximately 15 days, but the technique of going into operation fast can use after well head improvement and installation completes, and reduced between a large amount of stopping times such as equipment tissue, construction;
5, Risk Identification: conventional coiled tubing operation technique exists the multinomial risks such as the leakage of pipeline thorn, falling from high altitude, pipeline superpressure, mechanical wounding, and the technique of going into operation fast changes complicated shaft construction into simple flow process switching, and operating risk reduces greatly.
Accompanying drawing explanation
Fig. 1 is that gas well of the present invention is lowered to the casing programme generalized section that the quick gas production method of coiled tubing is used at a bite well.
In figure, 1-master control gate valve, 2-sleeve pipe is produced gate valve, 3-sleeve pipe pressure control gate valve, 4-produces gate valve, the empty gate valve of producing of 5-oil oil ring, and 6-tests gate valve, 7-coiled tubing is produced gate valve, 8-pin type choke valve, 9-tubing gauge, 10-casing pressure table, 11-surface pipe, 12-production casing, 13-oil pipe, 14-coiled tubing, 15-blanking plug, 16-hydraulic anchor, 17-packer, 18-artificial bottom of a well.
The specific embodiment
Embodiment 1: be lowered to the quick gas production method of coiled tubing as example take a gas well, for example the present invention be described in further detail.Consult Fig. 1.
Adopt gas well to be lowered to the gas well casing programme of the quick gas production method of coiled tubing:
Comprise that sleeve pipe, oil pipe 13, coiled tubing 14, blanking plug 15, hydraulic anchor 16, packer 17 and artificial bottom of a well 18 form, described sleeve pipe is by surface pipe 11 and production casing 12.The top of production casing 12 is fixed on well head by casing hanger, there is artificial bottom of a well 18 in the bottom of production casing 12, in production casing 12, be lowered to oil pipe 13, the top of oil pipe 13 is fixed on well head by boll-weevil hanger, between the lower end outer wall of oil pipe 13 and production casing 12 inwalls, by packer 17 packings, oil pipe 13 is fixed by hydraulic anchor 16 on the top of packer 17 and between production casing 12 and oil pipe 13; In oil pipe 13, be lowered to coiled tubing 14, the top of coiled tubing 14 is fixed in slips hanger, slips hanger is arranged on master control gate valve 1 by flange connect and produces between gate valve 4 annular space between slips hanger sealing oil pipe 13 and coiled tubing 14.There is blanking plug 15 lower end of coiled tubing 14; Boll-weevil hanger is in order to hang the annular space between OIH pipe 13 and sealing oil pipe 13 and production casing 12;
In gas well drilling process, make sleeve pipe and stratum sealing combination by well cementation.Surface pipe 11 bit diameter 311.2mm, sleeve pipe external diameter 244.5mm, when well cementation, cement returns height to well head, and cement plug height is greater than 20m; Production casing 12 bit diameter 215.9mm, sleeve pipe external diameter 139.7mm, drilling well finishes rear employing positive injection back squeeze well cementation mode, and just the section of note cement paste sealing gas-bearing formation is more than 300 meters, the anti-following 400 meters of annular spaces of section sealing well head that squeeze, artificial bottom of a well 18 is greater than 20m apart from boundary at the bottom of gas-bearing formation.
Separate stratum fracfturing combination producing well adopts mechanical packing diameter 73.02mm oil pipe completion tubular column, be the integrated pipe column of oil pipe 13, hydraulic anchor 16 and packer 17 from top to bottom, oil pipe 13 specifications are external diameter 73.02mm, packer 17 models are Y344, hydraulic anchor 16 is in order to connected pipes 13 and packer 17, and packer 17 is realized sealing and the isolation to different layers position in the time of gas-bearing formation transformation pressure break, after pressure break success, the automatic deblocking of packer 17, realizes the object of separate stratum fracfturing, combination producing.
Coiled tubing 14 is lowered to before oil pipe 13, first in coiled tubing 14 bottoms, blanking plug 15 is installed, then utilize not kill-job of coiled tubing work vehicle to carry out lower well operations to coiled tubing 14, complete the input operation of coiled tubing 14, blanking plug 15 upper end cones insert in the conical centre bore in coiled tubing 14 lower ends, and seal installation by sealing ring and stop-leak compound.
The gas well mouth device adopting, comprises christmas tree; Christmas tree is fixed on the top of production casing 12, the both sides of the big four of christmas tree bottom are distinguished splicing sleeve by flange and are produced gate valve 2 and sleeve pipe pressure control gate valve 3, at the other end splicing sleeve pressure meter 10 of sleeve pipe pressure control gate valve 3, casing pressure table 10 is in order to read casing pressure value.The other end of producing gate valve 2 at sleeve pipe is connected with sleeve pipe production flow line; The top of christmas tree big four connects master control gate valve 1 by flange; The top of master control gate valve 1 is by flange connecting tee formula slips hanger, and a side of slips hanger connects the empty gate valve 5 of producing of oil ring by flange, and the empty other end of producing gate valve 5 of oil ring is connected with the empty production flow line of oil ring; The top of slips hanger is connected and is produced gate valve 4 by flange, the top that produces gate valve 4 connects little four-way, the top of little four-way is by flange connecting test gate valve 6, one side of little four-way is by plug sealing, little four-way opposite side connects coiled tubing by flange and produces gate valve 7, and the other end that coiled tubing is produced gate valve 7 is connected with coiled tubing production flow line; Sleeve pipe production flow line, the empty production flow line of oil ring and coiled tubing production flow line are communicated with by vertical tube line (high pressure header); On vertical tube line, be fixed with tubing gauge 9, tubing gauge 9, in order to read oil pressure value, is connected with horizontal production flow line on vertical tube line, laterally on production flow line, is connecting a pin type choke valve 8.
The model that christmas tree adopts is KQ65-70 type, and the model of pin type choke valve 8 is JLK45-70 types, and sleeve pipe production flow line, the empty production flow line of oil ring, coiled tubing production flow line, vertical tube line and the model that laterally production flow line adopts are DN65.
Gas well is lowered to the quick gas production method of coiled tubing, carries out according to the following steps:
The on off state of steps A, the each valve of inspection christmas tree, sleeve pipe is produced gate valve 2, empty gate valve 5, test gate valve 6, coiled tubing production gate valve 7 and the pin type choke valve 8 produced of oil ring cuts out; Sleeve pipe pressure control gate valve 3 apertures are full-gear 1/3, guarantee that casing pressure value can normally read; Master control gate valve 1 and produce gate valve 4 in full-gear, and hang " forbid operation " warning sign, prevents from damaging when maloperation from closing coiled tubing 14;
Step B, open sleeve pipe produce gate valve 2, read oil pressure value 12.1 MPas by tubing gauge 9;
Step C, open coiled tubing produce gate valve 7, utilize source of the gas in sleeve pipe (after sleeve pipe produces gate valve 2 and coiled tubing and produce gate valve 7 and open, sleeve pipe is communicated with coiled tubing production procedure) to the interior pressurising of coiled tubing 14, until the casing pressure balance that coiled tubing 14 internal pressures and casing pressure table 10 show, oil pressure and casing pressure value are 11.3 MPas; Make inner this force value that keeps of coiled tubing 14;
Step D, close sleeve pipe and produce gate valve 2 and coiled tubing and produce gate valve 7, coiled tubing 14 internal pressures remain unchanged; Open the empty gate valve 5 of producing of oil ring, and utilize pin type choke valve 8 reducing pressure by regulating flow opening well and making production, check force value shown in tubing gauge 9 and casing pressure table 10, tubing pressure continuous decrease, casing pressure is slow decreasing thereupon, and tubing pressure fall off rate is greater than casing pressure fall off rate; In this process, the blanking plug 15 upper and lower end face pressure reduction that are arranged on coiled tubing 14 bottoms constantly increase, and blanking plug 15 upper surface pressure-bearings are coiled tubing 14 internal pressures and remain unchanged, and lower surface pressure-bearing is bottom pressure and slow decreasing.
Step e,, casing pressure value table trend oily by tubing gauge 9 and the observation of casing pressure table 10, every 5 minutes admission gas well creation datas once, the parameter of admission comprises tubing pressure, casing pressure, instant productivity, outer defeated pressure etc., in the time that casing pressure rises to 8.3 MPas (casing pressure go up 0.1 MPa) by 8.2 MPas, be tentatively judged as blanking plug 15 and come off;
Step F, close empty gate valve 5 and the pin type choke valve 8 produced of oil ring, open coiled tubing and produce gate valve 7, check the casing pressure value of oil pressure value and the casing pressure table 10 of tubing gauge 9, if when oil pressure value is less than inner initial pressure 11.3 MPas of coiled tubing 14 or approximates real-time casing pressure value 8.3 MPa, judge that blanking plug comes off;
Step G, again open pin type choke valve 8 reducing pressure by regulating flow opening well and making production (now conducting of coiled tubing flow process), until oil pressure value drops to after outer defeated pressure 1.2 MPas of gas well, standard-sized sheet pin type choke valve 8 carries out normal gas production production.
Claims (2)
1. gas well is lowered to the quick gas production method of coiled tubing, it is characterized in that: carry out according to the following steps:
The on off state of steps A, the each valve of inspection christmas tree, sleeve pipe is produced gate valve (2), empty gate valve (5), test gate valve (6), coiled tubing production gate valve (7) and the pin type choke valve (8) produced of oil ring cuts out; Sleeve pipe pressure control gate valve (3) aperture is full-gear 1/3, guarantees that casing pressure value can normally read; Master control gate valve (1) and production gate valve (4) are in full-gear;
Step B, open sleeve pipe produce gate valve (2), read oil pressure value by tubing gauge (9);
Step C, open coiled tubing produce gate valve (7), utilize source of the gas in sleeve pipe to the interior pressurising of coiled tubing (14), until the casing pressure balance that coiled tubing (14) internal pressure and casing pressure table (10) show makes inner this force value that keeps of coiled tubing (14);
Step D, close sleeve pipe and produce gate valve (2) and coiled tubing production gate valve (7), coiled tubing (14) internal pressure remains unchanged; Open the empty gate valve (5) of producing of oil ring, and utilize pin type choke valve (8) reducing pressure by regulating flow opening well and making production, check force value shown in tubing gauge (9) and casing pressure table (10), tubing pressure continuous decrease, casing pressure is slow decreasing thereupon, and tubing pressure fall off rate is greater than casing pressure fall off rate; In this process, blanking plug (15) the upper and lower end face pressure reduction that is arranged on coiled tubing (14) bottom constantly increases;
Step e,, casing pressure value table trend oily by tubing gauge (9) and casing pressure table (10) observation, every 5 minutes admission gas well creation datas once, the parameter of admission comprises tubing pressure, casing pressure, instant productivity, outer defeated pressure, in the time that casing pressure rises to 8.3 MPa by 8.2 MPas, be tentatively judged as blanking plug (15) and come off;
Step F, close empty gate valve (5) and the pin type choke valve (8) produced of oil ring, open coiled tubing and produce gate valve (7), check the casing pressure value of oil pressure value and the casing pressure table (10) of tubing gauge (9), if when oil pressure value is less than inner initial pressure 11.3 MPas of coiled tubing (14) or approximates real-time casing pressure value 8.3 MPa, judge that blanking plug comes off;
Step G, again open pin type choke valve (8) reducing pressure by regulating flow opening well and making production, until oil pressure value drops to after outer defeated pressure 1.2 MPas of gas well, standard-sized sheet pin type choke valve (8) carries out normal gas production production;
Gas well casing programme: comprise sleeve pipe, oil pipe (13), coiled tubing (14), blanking plug (15), hydraulic anchor (16), packer (17) and artificial bottom of a well (18), described sleeve pipe is made up of surface pipe (11) and production casing (12); The top of production casing (12) is fixed on well head by casing hanger, there is artificial bottom of a well (18) in the bottom of production casing (12), in production casing (12), be lowered to oil pipe (13), the top of oil pipe (13) is fixed on well head by boll-weevil hanger, between the lower end outer wall of oil pipe (13) and production casing (12) inwall, by packer (17) packing, oil pipe (13) is fixed by hydraulic anchor (16) on the top of packer (17) and between production casing (12) and oil pipe (13); In oil pipe (13), be lowered to coiled tubing (14), the top of coiled tubing (14) is fixed in slips hanger, slips hanger is arranged on master control gate valve (1) and is produced between gate valve (4) by flange connect, and slips hanger is in order to seal the annular space between oil pipe (13) and coiled tubing (14); There is blanking plug (15) lower end of coiled tubing (14); Boll-weevil hanger is in order to hang the annular space between OIH pipe (13) and sealing oil pipe (13) and production casing (12);
The gas well mouth device adopting, comprises christmas tree; Christmas tree is fixed on the top of production casing (12), the both sides of the big four of christmas tree bottom are distinguished splicing sleeve by flange and are produced gate valve (2) and sleeve pipe pressure control gate valve (3), at the other end splicing sleeve pressure meter (10) of sleeve pipe pressure control gate valve (3), casing pressure table (10) is in order to read casing pressure value; The other end of producing gate valve (2) at sleeve pipe is connected with sleeve pipe production flow line; The top of christmas tree big four connects master control gate valve (1) by flange; The top of master control gate valve (1) is by flange connecting tee formula slips hanger, one side of slips hanger connects the empty gate valve (5) of producing of oil ring by flange, and the empty other end of producing gate valve (5) of oil ring is connected with the empty production flow line of oil ring; The top of slips hanger is connected and is produced gate valve (4) by flange, the top that produces gate valve (4) connects little four-way, the top of little four-way is by flange connecting test gate valve (6), one side of little four-way is by plug sealing, little four-way opposite side connects coiled tubing by flange and produces gate valve (7), and the other end that coiled tubing is produced gate valve (7) is connected with coiled tubing production flow line; Sleeve pipe production flow line, the empty production flow line of oil ring and coiled tubing production flow line are communicated with by vertical tube line; On vertical tube line, be fixed with tubing gauge (9), tubing gauge (9), in order to read oil pressure value, is connected with horizontal production flow line on vertical tube line, laterally on production flow line, is connecting a pin type choke valve (8).
2. gas well according to claim 1 is lowered to the quick gas production method of coiled tubing, it is characterized in that: the model that christmas tree adopts is KQ65-70 type, the model of pin type choke valve (8) is JLK45-70 type, and sleeve pipe production flow line, the empty production flow line of oil ring, coiled tubing production flow line, vertical tube line and the model that laterally production flow line adopts are DN65.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210108119.1A CN102635337B (en) | 2012-04-13 | 2012-04-13 | Rapid gas production method implemented after coiled tubing is put in gas well |
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| CN201210108119.1A CN102635337B (en) | 2012-04-13 | 2012-04-13 | Rapid gas production method implemented after coiled tubing is put in gas well |
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| CN102635337B true CN102635337B (en) | 2014-06-04 |
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| CN108487882B (en) * | 2018-02-23 | 2020-05-01 | 中国石油大学(北京) | Christmas tree device and method for exploiting natural gas hydrate |
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| CN108999597A (en) * | 2018-08-10 | 2018-12-14 | 中国石油化工股份有限公司江汉油田分公司石油工程技术研究院 | A kind of center completion tubular column and gaslift construction method for gaslift production |
| CN111021982B (en) * | 2018-10-09 | 2022-03-29 | 中国石油天然气股份有限公司 | Well cementing method and well cementing device |
| CN110107264A (en) * | 2019-05-22 | 2019-08-09 | 迪瑞普技术（北京）有限公司 | A kind of gaslift suitable for gas well Life cycle water pumping gas production |
| CN113153157B (en) * | 2021-04-12 | 2022-12-20 | 山东省地勘局第二水文地质工程地质大队(山东省鲁北地质工程勘察院) | Surface layer high-pressure water gas layer drainage well cementation tool and process in geological drilling |
| CN113266316A (en) * | 2021-07-02 | 2021-08-17 | 西安航空职业技术学院 | Gas production device and method for wellhead |
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| CN2559783Y (en) * | 2002-07-16 | 2003-07-09 | 辽河石油勘探局总机械厂 | Viscous oil thermal recovery well head apparatus |
| CN202108455U (en) * | 2011-06-15 | 2012-01-11 | 中国石油化工股份有限公司 | Well opening system of abnormally-high-pressure gas well |
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