CN104074489B - Oil/gas Well drainage shutoff method with pressure - Google Patents
Oil/gas Well drainage shutoff method with pressure Download PDFInfo
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- CN104074489B CN104074489B CN201410299751.8A CN201410299751A CN104074489B CN 104074489 B CN104074489 B CN 104074489B CN 201410299751 A CN201410299751 A CN 201410299751A CN 104074489 B CN104074489 B CN 104074489B
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Abstract
Oil/gas Well drainage of the present invention shutoff method with pressure, comprises the following steps: first within one week, dig Wai Keng downwards along sleeve pipe; Regularly drain hole prodelta clay water and clear up foreign material; Between hole hole wall and sleeve pipe, build interior wall outside, at the bottom of wall, be horizontally disposed with tubing nipple A and externally cheat ponding and carry out drainage draining; At the bottom of the hole between interior wall and sleeve pipe, be in the milk; At the external oil pipe pipe nipple B of tubing nipple A valve place, and building an annular exterior wall near tubing nipple B end; To being in the milk at the bottom of the hole between annular exterior wall and interior wall; Build Fang Fang hole brick wall away from tubing nipple B port, tubing nipple B port is connected to plug and seals and fill with; Successively compacting is filled and led up in outer hole, the then whole outer hole of backfill with soil. Oil/gas Well drainage of the present invention shutoff method with pressure, utilizes drainage dividing potential drop technology effectively to control current, then utilizes expansion cement slurry to carry out leak stopping, realize the object of water blockoff with pressure, solved existing method and cannot carry out to water body with pressure the problem of leak stopping, water plugging effect is good, and cost is low.
Description
Technical field
The invention belongs to oil water-plugging technique field, be specifically related to a kind of Oil/gas Well drainage water blockoff side with pressureMethod.
Background technology
Oil and the most frequently used water-plugging technique of other engineering fields have cement leak stopping, chemical gel leak stopping etc.Conventional for water-blocking operation method not with pressure is relatively simple, the selection of material is extensive, is generally cement or changeLearn gel-like substance, adding of having, solid particulate matter is in addition composite can obtain good effect; ButEmit the phenomenon of water, gas, oil for Oil/gas Well surface pipe, because water body is with pressure, general stifledWater method leak stopping difficulty.
Summary of the invention
The object of this invention is to provide a kind of Oil/gas Well drainage shutoff method with pressure, solved existing method pairThe problem of the Oil/gas Well leak stopping difficulty of water body with pressure.
The technical solution adopted in the present invention is: Oil/gas Well drainage shutoff method with pressure, specifically comprises followingStep:
Step 1: dig Wai Keng
Take off well head protective cover, within one week, dig Wai Keng downwards along sleeve pipe, dig to lithosphere;
Step 2: cleaning ponding and foreign material
When construction, ensure that outer hole, without ponding, cleans out the foreign material that are attached on conduit and sleeve pipe, and every oneFix time and drain once outer hole ponding, until cleaning work finishes;
Step 3: build interior wall between hole hole wall and sleeve pipe outside, be horizontally disposed with tubing nipple A couple at the bottom of wallOuter hole ponding carries out drainage draining;
Step 4: to being in the milk at the bottom of the hole between interior wall and sleeve pipe
Enter early strong Silica fume grout to the outer hole rising pouring between interior wall and sleeve pipe, and then to Implanted Silicon in holePowder cement mortar, the grouting of whole shop fixtures requires to complete in 10min, after shop fixtures grouting, observe cement top withoutWhen clear water oozes out, cover straw mattress at cement slurry end face, certain interval of time is sprinkled water once; Cement slurry solidifiesWith fast blockage spirit, end face is sealed to filling afterwards;
Step 5: build annular exterior wall
At the external tubing nipple B in the valve place of tubing nipple A, approaching oil away from valve one endPipe pipe nipple B builds port an annular exterior wall, highly not higher than interior wall, and after annular exterior wall puzzles, cementThe sufficient pouring of mortar, the siccative volume ratio of cement mortar is cement: quartz sand=1:1, body of wall basal plane and body of wallEnough grouting own;
Step 6: to being in the milk at the bottom of the hole between annular exterior wall and interior wall
Hole wall between annular exterior wall and interior wall and the end, hole are washed away totally, stifled fast to hole wall and hole primary coat brushLeak spirit, leak stopping spirit is filled out fragment of brick at the bottom of solidifying backward hole, then prepares expansion cement slurry and is in the milk; And intervalCertain hour evenly sprays clear water to body of wall wall and cement mortar end face; After cement mortar solidifies, with stifled fastLeak spirit end face is sealed to filling;
Step 7: build outer hole brick wall sealing
Cheating brick wall away from hole, outer hole wall near tubing nipple B port block side, highly not higher than annularExterior wall, takes out hole internal water accumulation, the foreign material of hole, side brick wall inwall is cleaned out, fast by tubing nippleB port connects plug and also seals filling with fast blockage spirit;
Step 8: banket in outer hole
Successively outer hole ecto-entad is filled and led up to compacting equably along exterior wall periphery with soil, then use earthen backfill wholeIndividual outer hole successively compacting, complete shutoff.
Feature of the present invention is also,
In step 2, drain and once cheat prodelta clay water every 20min.
In the time carrying out step 2, one first hole of drawing water is dug near cheating outside feather edge by elder generation, and at sleeve pipe rootOne second hole of drawing water is dug by portion, then from upwards iron rust and the greasy dirt of cannula cleaning outer surface of ferrule boot,By smooth to the bottom in outer hole and wall cleaning.
Step 3 specifically comprises the following steps:
Step 3.1: fragment of brick is fully soaked; The wall base is washed away smooth clean, simultaneously from ferrule bootSecond draws water cheats outwards extraction ponding, until the end of building a wall;
Step 3.2: taking sleeve pipe center line as the center of circle, between hole and sleeve pipe, build annular interior wall outside, andScupper at the bottom of staying an aperture as wall at the bottom of wall; Build a wall and use the sufficient pouring of cement mortar, body of wall basal plane withThe enough grouting of body of wall itself, guarantees the firm of wall and sealing;
Step 3.3: after block interior wall finishes, certain interval of time draws water to cheat from second of ferrule boot and drainsPonding;
Step 3.4: prepare a tubing nipple A, seal with steel plate one end, and beating near this endMultiple holes are made screen casing and are ensured that draining is unimpeded, and the other end is evenly coated dope and tightened valve, and oil pipe is shortJoint A penetrates scupper at the bottom of wall, is laid in interior wall bottom, and punching end contacts with sleeve pipe, by interior wall and coverForeign material complete liquidation at the bottom of hole between pipe and on sleeve pipe is clean; By dry scupper internal face cleaning at the bottom of wallOnly, then from inside to outside scupper is blocked several times with fast blockage spirit, make the water can only be from tubing nippleFlow out in hole on A;
Step 3.5: prepare an annular steel plate, be cut to equal-sized two, by twoSteel plate lies in the bottom between sleeve pipe and interior wall, uses respectively two U-shaped cards and two stay bolts by twoSteel plate is connected and fixed, on surface pipe wall, be coated with stop-leak compound after with fast blockage spirit by steel plate above sealing.
In step 3.2, the siccative volume ratio of cement mortar is cement: quartz sand=1:1; In step 3.3, build a wallFinish first 4 hours, the ponding of draining one time per hour, then drains one time ponding for every 2 hours; StepIn 3.5, fast blockage spirit model is sy-926, sealing thickness 5cm.
In step 4, early strong Silica fume grout formula is, dry ash: silica flour: caustic soda: early strength agent: filtrate loss reduction additiveMass ratio=75:25:5:5:1.8 of J-36, cement mortar proportion 1.85g/cm3; Silica fume grout formula is,Dry ash: silica flour: mass ratio=75:25:1.8 of filtrate loss reduction additive J-36, cement mortar proportion 1.75g/cm3。
In step 4, on straw mattress, light and slow watering in every 2 hours once, is adhered to 72 hours.
In step 6, the proportion of expansion cement slurry is 1.51g/cm3, consist of cement dry ash, swelled ground andThe volume ratio of water is 3:1:4, prepares to starch within latter 2 hours to complete grouting.
Within in step 6 every 2 hours, spray a clear water, water spray dynamics must not be broken up cement mortar; Stifled fastLeaking spirit envelope filling thickness is 10cm.
In step 7, seal grouting liquid height higher than plug top 15cm, above cover fragment of brick.
The invention has the beneficial effects as follows: Oil/gas Well drainage of the present invention shutoff method with pressure, utilizes drainage dividing potential dropTechnology is controlled current effectively, and water body with pressure can better be controlled, and then utilizes expansion cement slurry to enterRow leak stopping, realize the object of water blockoff with pressure, and having solved existing method cannot carry out leak stopping to water body with pressureProblem, expanding cement can effectively be saved the channelling of current with pressure, can reduce microcrack, water plugging effectGood, cost is low, can extensively extend to the natural gas well, oil well and other building engineering fields.
Brief description of the drawings
Fig. 1 is the construction schematic diagram of the embodiment of the present invention.
In figure, 1. sleeve pipe, 2. first hole of drawing water, 3. interior wall, 4. hole, side brick wall, 5. tubing nipple A, 6.Conduit, 7. annular exterior wall, 8. second hole of drawing water, 9. hole, 10. steel plate, 11. valves, 12. tubing nipple B,13. plugs.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Oil/gas Well drainage of the present invention shutoff method with pressure, specifically comprises the following steps:
Step 1: dig Wai Keng
Take off well head protective cover, within 1 one weeks, dig Wai Keng downwards along sleeve pipe, dig to lithosphere;
Step 2: cleaning ponding and foreign material
When construction, ensure that outer hole, without ponding, cleans out the foreign material that are attached on conduit 6 and sleeve pipe 1, and everyHole ponding outside 20min drains once, until cleaning work finishes; Draw water for convenience, cheat outside baseNear edge, dig one first draw water hole 2, and sleeve pipe 1 root dig one second draw water hole 8, then fromSleeve pipe 1 root is iron rust and the greasy dirt of cannula cleaning 1 outer surface upwards, by the bottom in outer hole and wall cleaningSmooth;
Step 3: build interior wall between hole hole wall and sleeve pipe outside, be horizontally disposed with tubing nipple A couple at the bottom of wallOuter hole ponding carries out drainage draining;
Step 3.1: fragment of brick is fully soaked; The wall base is washed away smooth clean, simultaneously from sleeve pipe 1 rootSecond hole 8 of drawing water outwards extract ponding out, until the end of building a wall;
Step 3.2: taking sleeve pipe 1 center line as the center of circle, between hole and sleeve pipe 1, build annular interior wall 3 outside,And at the bottom of staying an aperture as wall at the bottom of wall scupper; Build a wall and use the sufficient pouring of cement mortar, cement mortarSiccative volume ratio be cement: quartz sand=1:1, body of wall basal plane and body of wall enough grouting itself, guarantees wallFirm with sealing;
Step 3.3: after building interior wall 3 and finishing, first 4 hours, the ponding of draining one time per hour, then every 2Hour 8 drain ponding from second of the ferrule boot hole of drawing water;
Step 3.4: prepare a tubing nipple A5, seal with steel plate one end, and beating near this endMultiple holes 9 are made screen casing and are ensured that draining is unimpeded, and the other end is evenly coated dope and tightened valve 11, by oilPipe pipe nipple A5 penetrates scupper at the bottom of wall, is laid in interior wall 3 bottoms, and punching end contacts with sleeve pipe 1,By clean the foreign material complete liquidation at the bottom of the hole between interior wall 3 and sleeve pipe 1 and on sleeve pipe 1; By draining at the bottom of wallHole internal face is cleaned out, then from inside to outside that scupper is stifled several times with fast blockage spirit sy-926Extremely, water can only be flowed out in the hole 9 from tubing nipple A5;
Step 3.5: prepare an annular steel plate, be cut to equal-sized two, by twoSteel plate 10 lies in the bottom between sleeve pipe 1 and interior wall 3, uses respectively two U-shaped cards and two long spiral shellsBolt is connected and fixed two block plates 10, uses fast blockage spirit after being coated with stop-leak compound on surface pipe 1 wallSy-926 is by steel plate 10 top sealing, sealing thickness 5cm;
Step 4: to being in the milk at the bottom of the hole between interior wall and sleeve pipe
After ten minutes, enter early strong with leak stopping spirit shutoff success to the outer hole rising pouring between interior wall 3 and sleeve pipe 1Silica fume grout, wherein early strong Silica fume grout formula is, dry ash in mass ratio: silica flour: caustic soda: early strength agentJS/FDN-7: filtrate loss reduction additive J-36=75:25:5:5:1.8, cement mortar proportion is 1.85g/cm3; And thenIn hole, inject Silica fume grout, Silica fume grout formula is, dry ash in mass ratio: silica flour: fall dehydrationAgent J-36=75:25:1.8, cement mortar proportion 1.75g/cm3, whole shop fixtures grouting requires in 10minComplete, after shop fixtures grouting, observe when underground water mud end face oozes out without clear water and cover straw mattress at cement slurry end face,Light and slow watering in every 2 hours once, is adhered to 72 hours; With fast blockage spirit sy-926 to slurry end faceSeal filling, envelope is filled with thickness 10cm;
Step 5: build annular exterior wall
At the external tubing nipple B12 in valve 11 places of tubing nipple A5, away from valve 11One end approaches tubing nipple B12 port and builds an annular exterior wall 7, highly not higher than interior wall 3, annularAfter exterior wall 7 puzzles, the sufficient pouring of cement mortar, the siccative volume ratio of cement mortar is cement: quartz sand=1:1, the enough grouting of body of wall basal plane and body of wall itself;
Step 6: to being in the milk at the bottom of the hole between annular exterior wall and interior wall
Hole wall between annular exterior wall 7 and interior wall 3 and the end, hole are washed away totally, and hole wall and hole primary coat brush are fastLeak stopping spirit sy-926, leak stopping spirit is filled out fragment of brick at the bottom of solidifying backward hole, and then prepare expansion cement slurry and be in the milk,The proportion of expansion cement slurry is 1.51g/cm3, the volume ratio that consists of cement dry ash, swelled ground and water is3:1:4, prepares slurry and completes grouting within latter 2 hours; And push up to body of wall wall and cement mortar for 2 hours at intervalFace evenly sprays a clear water, and water spray dynamics must not be broken up cement mortar, maintenance 72 hours; With fastLeak stopping spirit sy-926 seals filling to cement mortar end face, and envelope is filled with thickness 10cm;
Step 7: block side's hole brick wall sealing
Cheating brick wall 4 away from hole, outer hole wall near the tubing nipple B12 port side of blocking, highly not higher thanAnnular exterior wall 7, takes out hole internal water accumulation, and the foreign material of hole, side brick wall 4 inwalls are cleaned out, and fast willTubing nipple B12 port connects plug and also seals filling, envelope grouting liquid with fast blockage spirit sy-926Height, higher than plug top 15cm, above covers fragment of brick;
Step 8: banket in outer hole
Successively outer hole ecto-entad is filled and led up to compacting equably along exterior wall periphery with soil, then use earthen backfill wholeIndividual outer hole successively compacting, complete shutoff.
Oil/gas Well drainage of the present invention shutoff method with pressure, utilizes drainage dividing potential drop technology effectively to control current,Water body with pressure can better be controlled, use fast blockage spirit to tie mutually with expansion cement slurry rigidity plugging methodClose and carry out leak stopping, a large amount of operations are not stressed under state and complete after diversion, realize the object of water blockoff with pressure,Solved existing method and cannot carry out to water body with pressure the problem of leak stopping, vertical dual-seal is reinforced, laterallyQuadruple sealing and reinforcing, expanding cement can effectively be saved the channelling of current with pressure, can reduce microcrack,Water plugging effect is good, and sealing and strengthening quality are reliable, and cost is low, can extensively extend to the natural gas well, oilWell and other building engineering fields.
Embodiment
Prolong 537 well locations in Zhang Qu village of Feng Zhuan township, Yanan City, Shaanxi Province, well Wei appraisal well, this wellSpud on July 25th, 2011, finishing drilling on September 8 in 2011, finishing drilling well depth 2969m, finishing drilling layerPosition: horse five5; This well casing programme is: top layer: drill bit Ф 311.1mm × 420.00m; Sleeve pipeФ 244.5mm × 420.00m; Gas-bearing formation: Ф 215.9mm drill bit × 2969.00m; Ф 139.7mm sleeve pipe× 2962.75m, between this well surface casing cementing complete rear well head top layer sleeve outer wall and ground, have oil, gas,Water overflows.
This accident well feature: formation fluid pressure is larger, the pressure 1MPa that still has an appointment while spilling into earth's surface,Estimate that strata pressure is at 4MPa left and right, reservoir pressure coefficient approximately 1.3; Water yield is large, day water outlet 7-8Side, excavating the long-term construction of soil layer or raining has the danger of hole wall landslide; Oil, gas, water intercommunication, leak stoppingMaterial is difficult to select, and gas channeling phenomenon is serious; Soil layer is difficult to solid with mud stone and the loss circulation material of meeting water deliquescingKnot; When processing accident this well gas testing finish, pit shaft internal pressure 16.5MPa, when construction, have clash into quick-friedThe danger of splitting.
According to the construction schematic diagram shown in Fig. 1, specifically implement according to following steps:
Step 1: dig Wai Keng
First hang mouthful protective cover that drives a well, then along sleeve pipe 1 one weeks with forklift and excavator dig out downwards long,Wide, be the side hole of 16m × 16m × 3m deeply; Continue down to dig length and width, be the side of 8m × 8m × 5m deeplyHole, obtains stairstepping and cheats outward;
Step 2: cleaning ponding and foreign material
Before construction, at least drain once outer hole ponding every day, cheats without ponding labor cleaning while ensureing construction outwardFall to be attached to the foreign material such as clay on conduit 6 and sleeve pipe 1, Behavior of Hardened Cement Paste, rock, be strictly on guard against in work progressFall piece and hurt sb.'s feelings, and cheat ponding outside 20min drains once, until cleaning work finishes; Take out for convenienceWater, first cheat outside the end dig a length and width apart from 1m place, edge, be first of 0.4m × 0.4m × 0.3m deeplyThe hole 2 of drawing water, and to dig an end face radius at sleeve pipe 1 root be 0.53m (taking sleeve pipe center line as the center of circle),Bottom surface is the reverse frustoconic hole (round platform top edge is apart from sleeve pipe wall 0.4m) of sleeve pipe cross section, and round platform is darkSpend for second of 0.3m draws water and cheat 8, the second bottom surface of drawing water hole 8 is cleared up smooth; From 1 of sleeve pipeIron rust and the greasy dirt of sleeve pipe 1 outer surface of 2.5m height upwards cleans in portion with buck, by the bottom surface in outer holeAnd wall cleaning is smooth clean;
Step 3: build interior wall between hole hole wall and sleeve pipe 1 outside, be horizontally disposed with tubing nipple A at the bottom of wallExternally hole ponding carries out drainage draining;
Step 3.1: fragment of brick is fully soaked; With wire brush and clear water, the wall base is washed away smooth clean, withTime with water pump from second of sleeve pipe 1 root draw water hole 8 every 20min outwards drain ponding one time, until buildWall finishes;
Step 3.2: taking sleeve pipe 1 center line as the center of circle, between hole and sleeve pipe 1, build annular interior wall 3 outside,Internal diameter 2.245m, thick 0.5m, the high 2.1m of wall, and arrange at the bottom of interior wall 3 bottoms stay an aperture as wallWater hole; Build a wall and use the sufficient pouring of cement mortar, the siccative volume ratio of cement mortar is cement: quartz sand=1:1, the enough grouting of body of wall basal plane and body of wall itself, guarantees the firm of wall and sealing; In order to prevent the earthworkCollapse, along four jiaos of walls of laying bricks respectively of bottom, outer hole, meanwhile, dig one with sleeve pipe axis at sleeve pipe 1 rootFor the center of circle, radius is the round pool of 0.625m, dark 0.35m;
Step 3.3: after building interior wall 3 and finishing, first 4 hours, per hour with water pump from sleeve pipe 1 rootSecond hole of drawing water 8 is drained ponding one time, then within every 2 hours, drains ponding one time, until after 72 hoursWhile starting to cheat interior construction, can stop;
Step 3.4: prepare Ф 73mm × 2m tubing nipple A5, seal with steel plate one end, andMake a call to a round 9 to make screen casing guarantee draining unimpeded near the long section of this end 50cm is upper, the other end is evenly coated withUpper dope tightens valve 11, and tubing nipple A5 is penetrated to scupper at the bottom of wall, is laid in interior wall 3 bottoms,Punching end contacts with sleeve pipe 1, by the greasy dirt at the bottom of the hole between interior wall 3 and sleeve pipe 1 and on sleeve pipe 1,The foreign material complete liquidations such as shale are clean; Scupper internal face at the bottom of wall is cleaned out, then used fast blockageSpirit sy-926 adds several times a small amount of water and becomes pasty state, from inside to outside scupper is blocked, and makes the water can only be from oilFlow out in hole 9 on pipe pipe nipple A5;
Step 3.5: prepare the circular steel plate of diameter 1.4m, a thick 8mm, a diameter 245mm is dug at centerCircular hole, be cut to equal-sized two, two block plates 10 are lain in to sleeve pipe 1 and interior wall 3Between bottom, with two U-shaped cards and two stay bolts, two block plates 10 are connected and fixed respectively,After being coated with the stop-leak compound that 50cm is thick on surface pipe 1 wall, use fast blockage spirit sy-926 slurries by steel plate 10Top sealing, sealing thickness 5cm;
Step 4: to being in the milk at the bottom of the hole between interior wall and sleeve pipe
After ten minutes, enter early strong with leak stopping spirit shutoff success to the outer hole rising pouring between interior wall 3 and sleeve pipe 1Silica fume grout 4 sides, grouting volume 4m3, grouting height 0.6m, early strong Silica fume grout formula is,Dry ash in mass ratio: silica flour: caustic soda: early strength agent JS/FDN-7: filtrate loss reduction additive J-36=75:25:5:5:1.8,Cement mortar proportion is 1.85g/cm3; And then in hole, inject Silica fume grout 4m3, Silica fume groutFormula is, dry ash in mass ratio: silica flour: filtrate loss reduction additive J-36=75:25:1.8, cement mortar proportion1.75g/cm3, whole shop fixtures grouting requires to complete in 10min, after shop fixtures grouting, observes underground water mudWhen end face oozes out without clear water, cover straw mattress at cement slurry end face, light and slow watering in every 2 hours once, is adhered to72 hours; With fast blockage spirit, sy-926 seals filling to slurry end face, and envelope is filled with thickness 10cm;
Step 5: build annular exterior wall
At the tubing nipple B12 of the external Ф 73mm × 0.6m in valve 11 places of tubing nipple A5,Pile up the circular Tu Liang of diameter as 5.6445m taking sleeve pipe axis as the center of circle, water is drawn outside beam, processFall the ponding in native beam, dig up the ooze in native beam; Clean out taking sleeve pipe axis is center of circle external diameterThe foreign material such as the ooze within the scope of 5.2445m, internal diameter 3.2445m annulus, away from valve 11 1 terminationsNearly tubing nipple B12 builds outside the annular of an internal diameter 4.2445m, thick 24cm, high 0.65m portWall 7, it is 10cm that tubing nipple B15 exposes annular exterior wall 7 length, after annular exterior wall 7 puzzles,The sufficient pouring of cement mortar, the siccative volume ratio of cement mortar is cement: quartz sand=1:1, body of wall basal plane withThe enough grouting of body of wall itself;
Step 6: to being in the milk at the bottom of the hole between annular exterior wall and interior wall
With wire brush and clear water respectively by wall below, the hole 0.7m height between annular exterior wall 7 and interior wall 3 andThe end, hole, is washed away totally, and at least 5 layers of fast blockage spirit sy-926 of hole wall and hole primary coat brush, after leak stopping spirit is solidifiedFill out fragment of brick to the end, hole, then preparing proportion is 1.51g/cm3Expansion cement slurry 5m3Be laid in the end, hole,Cement mortar height is 0.5m, for ensureing that cement mortar is laid in the end, hole, requires to comply with from the four limit center lines in holeInferior grouting, if desired with machinery or manually cement mortar is pulled out flat, expansion cement slurry to consist of cement dryThe volume ratio of ash, swelled ground and water is 3:1:4, prepares to starch within latter 2 hours to complete grouting; And interval 2Hour evenly spray a clear water to body of wall wall and cement mortar end face, to after 72 hours when fill constructionStop, water spray dynamics is little, cement mortar must not be broken up; With fast blockage spirit, sy-926 pushes up cement mortarFace seals filling, and envelope is filled with thickness 10cm;
Step 7: block side's hole brick wall sealing
Building long 50cm, wide 40cm, height away from hole, outer hole wall near tubing nipple B12 portHole, the side brick wall 4 of 40cm, thick 12cm, takes out hole internal water accumulation, by the mud of hole, side brick wall 4 inwallsClean out with foreign material, fast tubing nipple B12 port connected to plug and use fast blockage spiritSy-926 seals filling, and envelope grouting liquid height, higher than plug top 15cm, above covers fragment of brick;
Step 8: banket in outer hole
Divide and successively outer hole ecto-entad is filled and led up to compacting equably along exterior wall periphery 15 times with soil, fill out for every layerWhen soil in, first steps on artificial pin from the periphery in wall 1m, other instruments of rear use or equipment, and fill construction is tightProhibit asymmetric, inhomogeneous extruding, be strictly on guard against that monolateral stressed causing of body of wall cave in or be out of shape, then return with soilFill out whole outer hole successively compacting, complete shutoff.
Table 1 prolongs 537 well leak stopping expenses statements
Approximately 1,000 ten thousand yuan of the costs of this well, utilize after the method leak stopping, obtain good result, apart from modern oneHow there is not surface pipe and emit water, gas, oily phenomenon in year, plugging effect is obvious, finds out this well by table 1Leaking-stoppage fee adds up to 26140 yuan, and cost is low, and the present invention's shutoff method with pressure has been avoided scrapping of this well,Retrieve economic loss, effectively stoped the generation of Environmental Safety accident.
Claims (10)
1. Oil/gas Well drainage shutoff method with pressure, is characterized in that, specifically comprises the following steps:
Step 1: dig Wai Keng
Take off well head protective cover, within one week, dig Wai Keng downwards along sleeve pipe, dig to lithosphere;
Step 2: cleaning ponding and foreign material
When construction, ensure that outer hole, without ponding, cleans out the foreign material that are attached on conduit and sleeve pipe, and every oneFix time and drain once outer hole ponding, until cleaning work finishes;
Step 3: build interior wall between hole hole wall and sleeve pipe outside, be horizontally disposed with tubing nipple A couple at the bottom of wallOuter hole ponding carries out drainage draining;
Step 4: to being in the milk at the bottom of the hole between interior wall and sleeve pipe
Enter early strong Silica fume grout to the outer hole rising pouring between interior wall and sleeve pipe, and then to Implanted Silicon in holePowder cement mortar, the grouting of whole shop fixtures requires to complete in 10min, after shop fixtures grouting, observe cement top withoutWhen clear water oozes out, cover straw mattress at cement slurry end face, certain interval of time is sprinkled water once; Cement slurry solidifiesWith fast blockage spirit, end face is sealed to filling afterwards;
Step 5: build annular exterior wall
At the external tubing nipple B in the valve place of tubing nipple A, approaching oil away from valve one endPipe pipe nipple B builds port an annular exterior wall, highly not higher than interior wall, and after annular exterior wall puzzles, cementThe sufficient pouring of mortar, the siccative volume ratio of cement mortar is cement: quartz sand=1:1, body of wall basal plane and body of wallEnough grouting own;
Step 6: to being in the milk at the bottom of the hole between annular exterior wall and interior wall
Hole wall between annular exterior wall and interior wall and the end, hole are washed away totally, stifled fast to hole wall and hole primary coat brushLeak spirit, leak stopping spirit is filled out fragment of brick at the bottom of solidifying backward hole, then prepares expansion cement slurry and is in the milk; And intervalCertain hour evenly sprays clear water to body of wall wall and cement mortar end face; After cement mortar solidifies, with stifled fastLeak spirit end face is sealed to filling;
Step 7: build outer hole brick wall sealing
Cheating brick wall away from hole, outer hole wall near tubing nipple B port block side, highly not higher than annularExterior wall, takes out hole internal water accumulation, the foreign material of hole, side brick wall inwall is cleaned out, fast by tubing nippleB port connects plug and also seals filling with fast blockage spirit;
Step 8: banket in outer hole
Successively outer hole ecto-entad is filled and led up to compacting equably along exterior wall periphery with soil, then use earthen backfill wholeIndividual outer hole successively compacting, complete shutoff.
2. Oil/gas Well drainage as claimed in claim 1 shutoff method with pressure, is characterized in that described stepIn rapid 2, drain and once cheat prodelta clay water every 20min.
3. Oil/gas Well drainage as claimed in claim 1 shutoff method with pressure, is characterized in that, is carrying outWhen described step 2, one first hole of drawing water is dug near cheating outside feather edge by elder generation, and digs one in ferrule bootIndividual second hole of drawing water, then from upwards iron rust and the greasy dirt of cannula cleaning outer surface of ferrule boot, by outer holeBottom and wall cleaning smooth.
4. Oil/gas Well drainage as claimed in claim 1 shutoff method with pressure, is characterized in that described stepRapid 3 specifically comprise the following steps:
Step 3.1: fragment of brick is fully soaked; The wall base is washed away smooth clean, simultaneously from ferrule bootSecond draws water cheats outwards extraction ponding, until the end of building a wall;
Step 3.2: taking sleeve pipe center line as the center of circle, between hole and sleeve pipe, build annular interior wall outside, andScupper at the bottom of staying an aperture as wall at the bottom of wall; Build a wall and use the sufficient pouring of cement mortar, body of wall basal plane withThe enough grouting of body of wall itself, guarantees the firm of wall and sealing;
Step 3.3: after block interior wall finishes, certain interval of time draws water to cheat from second of ferrule boot and drainsPonding;
Step 3.4: prepare a tubing nipple A, seal with steel plate one end, and beating near this endMultiple holes are made screen casing and are ensured that draining is unimpeded, and the other end is evenly coated dope and tightened valve, and oil pipe is shortJoint A penetrates scupper at the bottom of wall, is laid in interior wall bottom, and punching end contacts with sleeve pipe, by interior wall and coverForeign material complete liquidation at the bottom of hole between pipe and on sleeve pipe is clean; By dry scupper internal face cleaning at the bottom of wallOnly, then from inside to outside scupper is blocked several times with fast blockage spirit, make the water can only be from tubing nippleFlow out in hole on A;
Step 3.5: prepare an annular steel plate, be cut to equal-sized two, by twoSteel plate lies in the bottom between sleeve pipe and interior wall, uses respectively two U-shaped cards and two stay bolts by twoSteel plate is connected and fixed, on surface pipe wall, be coated with stop-leak compound after with fast blockage spirit by steel plate above sealing.
5. Oil/gas Well drainage as claimed in claim 4 shutoff method with pressure, is characterized in that described stepIn rapid 3.2, the siccative volume ratio of cement mortar is cement: quartz sand=1:1; The knot of building a wall in described step 3.3Bundle first 4 hours, the ponding of draining one time per hour, then drains one time ponding for every 2 hours; Described stepIn rapid 3.5, fast blockage spirit model is sy-926, sealing thickness 5cm.
6. Oil/gas Well drainage as claimed in claim 1 shutoff method with pressure, is characterized in that described stepIn rapid 4, early strong Silica fume grout formula is, dry ash: silica flour: caustic soda: early strength agent: the matter of filtrate loss reduction additive J-36Amount ratio=75:25:5:5:1.8, cement mortar proportion 1.85g/cm3; Silica fume grout formula is, dry ash: siliconPowder: mass ratio=75:25:1.8 of filtrate loss reduction additive J-36, cement mortar proportion 1.75g/cm3。
7. Oil/gas Well drainage as claimed in claim 1 shutoff method with pressure, is characterized in that described stepIn rapid 4, on straw mattress, light and slow watering in every 2 hours once, is adhered to 72 hours.
8. Oil/gas Well drainage as claimed in claim 1 shutoff method with pressure, is characterized in that described stepIn rapid 6, the proportion of expansion cement slurry is 1.51g/cm3, consist of the body of cement dry ash, swelled ground and waterLong-pending ratio is 3:1:4, prepares to starch within latter 2 hours to complete grouting.
9. Oil/gas Well drainage as claimed in claim 1 shutoff method with pressure, is characterized in that described stepWithin in rapid 6 every 2 hours, spray a clear water, water spray dynamics must not be broken up cement mortar; Fast blockage spirit envelopeFilling thickness is 10cm.
10. Oil/gas Well drainage as claimed in claim 1 shutoff method with pressure, is characterized in that, described inIn step 7, seal grouting liquid height higher than plug top 15cm, above cover fragment of brick.
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| RU2299308C2 (en) * | 2005-04-05 | 2007-05-20 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Water-bearing bed isolation method |
| US7694737B2 (en) * | 2007-11-14 | 2010-04-13 | Cpc Corporation, Taiwan | Method of blocking water-out zone in a gas well by dumping cement and injecting pressurizing gas |
| CN101638979A (en) * | 2008-07-31 | 2010-02-03 | 陕西海天石油科技有限公司 | Technology for water shutoff, leaking stoppage and secondary well cementation of oil-water wells |
| CN102071895A (en) * | 2009-11-25 | 2011-05-25 | 北京托普威尔石油技术服务有限公司 | Glue-filling plug type snubbing work plugging method |
| CN102747980A (en) * | 2012-07-18 | 2012-10-24 | 中国矿业大学 | Expansion type multi-grade pressurized rapid hole sealing technology |
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