CN104074489A - Oil-gas well drainage pressurized water shutoff method - Google Patents
Oil-gas well drainage pressurized water shutoff method Download PDFInfo
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- CN104074489A CN104074489A CN201410299751.8A CN201410299751A CN104074489A CN 104074489 A CN104074489 A CN 104074489A CN 201410299751 A CN201410299751 A CN 201410299751A CN 104074489 A CN104074489 A CN 104074489A
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Abstract
The invention provides an oil-gas well drainage pressurized water shutoff method, which comprises the following steps that: firstly, an outer pit is downwards dug along the circumference of a sleeve; accumulated water at the bottom of the the pit is regularly and thoroughly pumped, and sundries are regularly cleared; an inner wall is built between the pit wall of the outer pit and the sleeve, and an oil pipe nipple A is horizontally arranged at the bottom of the wall and is used for carrying out drainage water discharge on the accumulated water in the outer pit; grouting is carried out at the pit bottom between the inner wall and the sleeve; an oil pipe nipple B is externally connected in a position of a valve of the oil pipe nipple A, and in addition, an annular outer wall is built in a position near the end part of the oil pipe nipple B; the grouting is carried out on the pit bottom between the annular outer wall and the inner wall; a square pit brick wall is built in a position of an end opening far away from the oil pipe nipple B, and the end opening of the oil pipe nipple B is connected with a plug and is sealed and grouted; and the outer pit is filled, leveled up and compacted layer by layer by soil, and then, the whole outer pit is backfilled. The oil-gas well drainage pressurized water shutoff method has the advantages that a drainage pressure division technology is utilized for effectively controlling water flow, and then, expanding grout is used for leak stoppage, so the goal of pressurized water shutoff is achieved; the problem that the leak stoppage cannot be achieved on a pressurized water body in the prior art is solved; the water shutoff effect is good; and the 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 shutoff method with pressure.
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 chemical gel class material, and adding of having, solid particulate matter is in addition composite can obtain good effect; But emit the phenomenon of water, gas, oil for Oil/gas Well surface pipe, because water body is with pressure, general shutoff 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 the problem of the Oil/gas Well leak stopping difficulty of existing method to water body with pressure.
The technical solution adopted in the present invention is: Oil/gas Well drainage shutoff method with pressure, 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 drain at regular intervals 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 and externally cheat ponding and carry out drainage draining at the bottom of wall;
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 in hole, inject Silica fume grout, whole shop fixtures grouting requires to complete in 10min, after shop fixtures grouting, observes when cement top oozes out without clear water and covers straw mattress at cement slurry end face, and certain interval of time is sprinkled water once; Cement slurry solidifies and end face is sealed to filling with fast blockage spirit afterwards;
Step 5: build annular exterior wall
At the external tubing nipple B in the valve place of tubing nipple A, build an annular exterior wall approaching tubing nipple B port away from valve one end, highly not higher than interior wall, after annular exterior wall 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 and interior wall and the end, hole are washed away totally, and to hole wall and the spirit of hole primary coat brush fast blockage, 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 interval certain hour evenly sprays clear water to body of wall wall and cement paste end face; After cement paste solidifies, end face is sealed to filling with fast blockage spirit;
Step 7: build outer hole brick wall sealing
Cheating wall away from outer hole near hole, tubing nipple B port block side brick wall, highly, not higher than annular exterior wall, take out hole internal water accumulation, the foreign material of hole, side brick wall inwall are cleaned out, fast tubing nipple B port is connected to plug and also seal 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 the whole outer hole of earthen backfill 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 digs one second hole of drawing water in ferrule boot, then from upwards iron rust and the greasy dirt of cannula cleaning external 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, outwards extract ponding out from second of the ferrule boot hole of drawing water, until the end of building a wall simultaneously;
Step 3.2: taking sleeve pipe center line as the center of circle, build annular interior wall between hole and sleeve pipe outside, and stay an aperture as drainage tunnel at the bottom of wall; Build a wall and use the sufficient pouring of cement mortar, the enough grouting of body of wall basal plane and 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 drains ponding;
Step 3.4: prepare a tubing nipple A, seal with steel plate one end, and near this end beat multiple holes make screen casing ensure draining unimpeded, the other end is evenly coated dope and is tightened valve, tubing nipple A is penetrated to drainage tunnel under wall, be laid in interior wall bottom, punching end contacts with sleeve pipe, by clean the foreign material complete liquidation at the bottom of the hole between interior wall and sleeve pipe and on sleeve pipe; Drainage tunnel internal face at the bottom of wall is cleaned out, then from inside to outside drainage tunnel is blocked several times with fast blockage spirit, water can only be flowed out in the hole from tubing nipple A;
Step 3.5: prepare an annular steel plate, be cut to equal-sized two, two block plates are lain in to the bottom between sleeve pipe and interior wall, with two U-shaped cards and two stay bolts, two block plates are connected and fixed respectively, 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 wall first 4 hours that finish, the ponding of draining one time per hour, then drains one time ponding for every 2 hours; In step 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 admixture: mass ratio=75:25:5:5:1.8 of filtrate loss reduction additive J-36, cement paste proportion 1.85g/cm
3; Silica fume grout formula is, dry ash: silica flour: mass ratio=75:25:1.8 of filtrate loss reduction additive J-36, cement paste proportion 1.75g/cm
3.
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/cm
3, the volume ratio that consists of cement dry ash, expansive soil and 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 paste; It is 10cm that fast blockage spirit envelope is filled with thickness.
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, utilize drainage dividing potential drop technology effectively to control current, water body with pressure can better be controlled, then utilize expansion cement slurry to carry out leak stopping, realize the object of water blockoff with pressure, solve existing method and cannot carry out to water body with pressure the problem of leak stopping, expansive cement can effectively be saved the channelling of current with pressure, can reduce microcrack, water plugging effect is good, 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 cheat ponding outside 20min drains once, until cleaning work finishes; Draw water for convenience, cheat outside and dig one first hole 2 of drawing water near feather edge, and dig one second hole 8 of drawing water at sleeve pipe 1 root, then from upwards iron rust and the greasy dirt of cannula cleaning 1 external surface of sleeve pipe 1 root, by smooth to the bottom in outer hole and wall cleaning;
Step 3: build interior wall between hole hole wall and sleeve pipe outside, be horizontally disposed with tubing nipple A and externally cheat ponding and carry out drainage draining at the bottom of wall;
Step 3.1: fragment of brick is fully soaked; The wall base is washed away smooth clean, outwards extract ponding out from second of the sleeve pipe 1 root hole 8 of drawing water, until the end of building a wall simultaneously;
Step 3.2: taking sleeve pipe 1 center line as the center of circle, build annular interior wall 3 between hole and sleeve pipe 1 outside, and stay an aperture as drainage tunnel at the bottom of wall; Build a wall and use the sufficient pouring of cement mortar, the siccative volume ratio of cement mortar is cement: quartz sand=1:1, and the firm of wall and sealing are guaranteed in the enough grouting of body of wall basal plane and body of wall itself;
Step 3.3: after building interior wall 3 and finishing, first 4 hours, the ponding of draining one time per hour, then drained ponding from second of the ferrule boot hole 8 of drawing water in every 2 hours;
Step 3.4: prepare a tubing nipple A5, seal with steel plate one end, and near this end beat multiple holes 9 make screen casing ensure draining unimpeded, the other end is evenly coated dope and is tightened valve 11, tubing nipple A5 is penetrated to drainage tunnel under wall, be laid in interior wall 3 bottoms, 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; Drainage tunnel internal face at the bottom of wall is cleaned out, then from inside to outside drainage tunnel is blocked several times with fast blockage spirit sy-926, 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, two block plates 10 are lain in to the bottom between sleeve pipe 1 and interior wall 3, with two U-shaped cards and two stay bolts, two block plates 10 are connected and fixed respectively, be coated with stop-leak compound on surface pipe 1 wall after with fast blockage spirit sy-926 by steel plate 10 above sealing, sealing thickness 5cm;
Step 4: to being in the milk at the bottom of the hole between interior wall and sleeve pipe
With leak stopping spirit shutoff success after ten minutes, enter early strong Silica fume grout to the outer hole rising pouring between interior wall 3 and sleeve pipe 1, wherein early strong Silica fume grout formula is, dry ash in mass ratio: silica flour: caustic soda: early strength admixture JS/FDN-7: filtrate loss reduction additive J-36=75:25:5:5:1.8, cement paste proportion is 1.85g/cm
3; And then in hole, inject Silica fume grout, Silica fume grout formula is, dry ash in mass ratio: silica flour: filtrate loss reduction additive J-36=75:25:1.8, cement paste proportion 1.75g/cm
3, whole shop fixtures grouting requires to complete in 10min, observes when underground water mud end face oozes out without clear water and cover straw mattress at cement slurry end face after shop fixtures grouting, and light and slow watering in every 2 hours once, is adhered to 72 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 external tubing nipple B12 in valve 11 places of tubing nipple A5, build an annular exterior wall 7 approaching tubing nipple B12 port away from valve 11 one end, highly not higher than interior wall 3, 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, 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, hole wall and hole primary coat brush fast blockage spirit sy-926, 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 the proportion of expansion cement slurry is 1.51g/cm
3, the volume ratio that consists of cement dry ash, expansive soil and water is 3:1:4, prepares to starch within latter 2 hours to complete grouting; And interval 2 hours evenly sprays a clear water to body of wall wall and cement paste end face, water spray dynamics must not be broken up cement paste, maintenance 72 hours; With fast blockage spirit, sy-926 seals filling to cement paste 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 tubing nipple B12 port block side, highly not higher than annular exterior wall 7, take out hole internal water accumulation, the foreign material of hole, side brick wall 4 inwalls are cleaned out, fast tubing nipple B12 port is connected to plug and also seal filling with fast blockage spirit sy-926, envelope grouting liquid height, 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 the whole outer hole of earthen backfill successively compacting, complete shutoff.
Oil/gas Well drainage of the present invention shutoff method with pressure, utilize drainage dividing potential drop technology effectively to control current, water body with pressure can better be controlled, use fast blockage spirit and expansion cement slurry rigidity plugging method to combine 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, solve existing method and cannot carry out to water body with pressure the problem of leak stopping, vertical double seal is reinforced, laterally quadruple sealing and reinforcing, expansive cement can effectively be saved the channelling of current with pressure, can reduce microcrack, water plugging effect is good, sealing and strengthening quality are reliable, cost is low, can extensively extend to the natural gas well, oil well 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, and this well spudded on July 25th, 2011, finishing drilling on September 8 in 2011, finishing drilling well depth 2969m, finishing drilling layer position: horse 55; This well casing programme is: top layer: drill bit Ф 311.1mm × 420.00m; Sleeve pipe Ф 244.5mm × 420.00m; Gas-bearing formation: Ф 215.9mm drill bit × 2969.00m; Ф 139.7mm sleeve pipe × 2962.75m, has oil, gas, water to overflow between this well surface casing cementing complete rear well head top layer sleeve outer wall and ground.
This accident well feature: formation fluid pressure is larger, the pressure 1MPa that still has an appointment while spilling into earth's surface, estimates that strata pressure is at 4MPa left and right, reservoir pressure coefficient approximately 1.3; Water yield is large, day water outlet 7-8 side, and excavating the long-term construction of soil layer or raining has the danger of hole wall landslide; Oil, gas, water intercommunication, loss circulation material is difficult to select, and gas channeling phenomenon is serious; Soil layer is difficult to fixed with mud stone and the loss circulation material of meeting water deliquescing; When processing accident this well gas testing finish, pit shaft internal pressure 16.5MPa, has the danger of explosion of shock when construction.
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 dig out length and width downwards, be the hole, side of 16m × 16m × 3m deeply with forklift and excavator along sleeve pipe 1 one weeks; Continue down to dig length and width, deeply cheat for the square of 8m × 8m × 5m, obtain stairstepping to cheat outward;
Step 2: cleaning ponding and foreign material
Construct and at least drain once outer hole ponding front every day, ensure that construction time cheats without ponding outward, labor cleaning falls to be attached to the foreign material such as clay on conduit 6 and sleeve pipe 1, Behavior of Hardened Cement Paste, rock, is strictly on guard against that in work progress, falling piece hurts sb.'s feelings, and outside 20min drains once, cheat ponding, until cleaning work finishes; Draw water for convenience, first cheating outside the end digs a length and width, deeply cheats 2 for first of 0.4m × 0.4m × 0.3m draws water apart from 1m place, edge, 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, the round platform degree of depth is second of the 0.3m hole 8 of drawing water, by smooth second 8 bottom surface, the hole cleaning of drawing water; Upwards clean iron rust and the greasy dirt of sleeve pipe 1 external surface of 2.5m height with buck from sleeve pipe 1 root, by smooth clean to the bottom surface in outer hole and wall cleaning;
Step 3: build interior wall between hole hole wall and sleeve pipe 1 outside, be horizontally disposed with tubing nipple A and externally cheat ponding and carry out drainage draining at the bottom of wall;
Step 3.1: fragment of brick is fully soaked; With wire brush and clear water, the wall base is washed away smooth totally, draw water and cheat 8 every 20min and outwards drain ponding one time from second of sleeve pipe 1 root with water pump simultaneously, 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, internal diameter 2.245m, thick 0.5m, the high 2.1m of wall, and stay an aperture as drainage tunnel in interior wall 3 bottoms; Build a wall and use the sufficient pouring of cement mortar, the siccative volume ratio of cement mortar is cement: quartz sand=1:1, and the firm of wall and sealing are guaranteed in the enough grouting of body of wall basal plane and body of wall itself; In order to prevent cubic metre of earth collapsing, along four jiaos of walls of laying bricks respectively of bottom, outer hole, meanwhile, dig one taking sleeve pipe axis as the center of circle at sleeve pipe 1 root, 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 hourly draw water and cheat 8 and drain ponding one time from second of sleeve pipe 1 root with water pump, then within every 2 hours, drain ponding one time, until can stop while starting to cheat interior construction after 72 hours;
Step 3.4: prepare Ф 73mm × 2m tubing nipple A5, seal with steel plate one end, and in the section long near this end 50cm, making a call to a round 9, to make screen casing guarantee draining unimpeded, the other end is evenly coated dope and is tightened valve 11, tubing nipple A5 is penetrated to drainage tunnel under wall, be laid in interior wall 3 bottoms, punching end contacts with sleeve pipe 1, by clean the foreign material such as greasy dirt, the shale complete liquidation at the bottom of the hole between interior wall 3 and sleeve pipe 1 and on sleeve pipe 1; Drainage tunnel internal face at the bottom of wall is cleaned out, then added several times a small amount of water and become pasty state with fast blockage spirit sy-926, from inside to outside drainage tunnel is blocked, water can only be flowed out in the hole 9 from tubing nipple A5;
Step 3.5: prepare the circular steel plate of diameter 1.4m, a thick 8mm, the circular hole of a diameter 245mm is dug at center, be cut to equal-sized two, two block plates 10 are lain in to the bottom between sleeve pipe 1 and interior wall 3, with two U-shaped cards and two stay bolts, two block plates 10 are connected and fixed respectively, be coated with the stop-leak compound that 50cm is thick on surface pipe 1 wall after with fast blockage spirit sy-926 slurries by steel plate 10 above 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 Silica fume grout 4 sides, grouting volume 4m to the outer hole rising pouring between interior wall 3 and sleeve pipe 1 with leak stopping spirit shutoff success
3, grouting height 0.6m, early strong Silica fume grout formula is, dry ash in mass ratio: silica flour: caustic soda: early strength admixture JS/FDN-7: filtrate loss reduction additive J-36=75:25:5:5:1.8, cement paste proportion is 1.85g/cm
3; And then in hole, inject Silica fume grout 4m
3, Silica fume grout formula is, dry ash in mass ratio: silica flour: filtrate loss reduction additive J-36=75:25:1.8, cement paste proportion 1.75g/cm
3, whole shop fixtures grouting requires to complete in 10min, observes when underground water mud end face oozes out without clear water and cover straw mattress at cement slurry end face after shop fixtures grouting, and light and slow watering in every 2 hours once, is adhered to 72 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, dispose the ponding in native beam, dig up the ooze in native beam; Clean out taking sleeve pipe axis as center of circle external diameter 5.2445m, the foreign material such as ooze within the scope of internal diameter 3.2445m annulus, approaching tubing nipple B12 port away from valve 11 one end and building the annular exterior wall 7 of an internal diameter 4.2445m, thick 24cm, high 0.65m, 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, 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
Respectively wall below, hole 0.7m height and the end, hole between annular exterior wall 7 and interior wall 3, washed away totally with wire brush and clear water, hole wall and the clever sy-926 of at least 5 layers of fast blockage of hole primary coat brush, leak stopping spirit is filled out fragment of brick at the bottom of solidifying backward hole, and then preparing proportion is 1.51g/cm
3expansion cement slurry 5m
3be laid in the end, hole, cement paste height is 0.5m, for ensureing that cement paste is laid in the end, hole, require to be in the milk successively from the four limit center lines in hole, if desired with machinery or manually cement paste is pulled out flat, the volume ratio that consists of cement dry ash, expansive soil and water of expansion cement slurry is 3:1:4, prepares to starch within latter 2 hours to complete grouting; And interval 2 hours evenly sprays a clear water to body of wall wall and cement paste end face, to stopping when fill construction after 72 hours, water spray dynamics is little, cement paste must not be broken up; With fast blockage spirit, sy-926 seals filling to cement paste end face, and envelope is filled with thickness 10cm;
Step 7: block side's hole brick wall sealing
At hole, the side brick wall 4 of building long 50cm, wide 40cm, high 40cm, thick 12cm away from hole, outer hole wall near tubing nipple B12 port, take out hole internal water accumulation, mud and the foreign material of hole, side brick wall 4 inwalls are cleaned out, fast tubing nipple B12 port connected to plug and seal and fill with fast blockage spirit sy-926, 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, first step on artificial pin from the periphery in wall 1m while banketing for every layer, after use other instruments or equipment, asymmetric, inhomogeneous extruding that fill construction is forbidden, be strictly on guard against that monolateral stressed causing of body of wall cave in or be out of shape, then use the whole outer hole of earthen backfill 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 the present, surface pipe does not occur more than a year and emit water, gas, oily phenomenon, plugging effect is obvious, finds out that by table 1 this well leaking-stoppage fee adds up to 26140 yuan, cost is low, the present invention's shutoff method with pressure has been avoided scrapping of this well, has retrieved economic loss, effectively stops 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 drain at regular intervals 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 and externally cheat ponding and carry out drainage draining at the bottom of wall;
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 in hole, inject Silica fume grout, whole shop fixtures grouting requires to complete in 10min, after shop fixtures grouting, observes when cement top oozes out without clear water and covers straw mattress at cement slurry end face, and certain interval of time is sprinkled water once; Cement slurry solidifies and end face is sealed to filling with fast blockage spirit afterwards;
Step 5: build annular exterior wall
At the external tubing nipple B in the valve place of tubing nipple A, build an annular exterior wall approaching tubing nipple B port away from valve one end, highly not higher than interior wall, after annular exterior wall 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 and interior wall and the end, hole are washed away totally, and to hole wall and the spirit of hole primary coat brush fast blockage, 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 interval certain hour evenly sprays clear water to body of wall wall and cement paste end face; After cement paste solidifies, end face is sealed to filling with fast blockage spirit;
Step 7: build outer hole brick wall sealing
Cheating wall away from outer hole near hole, tubing nipple B port block side brick wall, highly, not higher than annular exterior wall, take out hole internal water accumulation, the foreign material of hole, side brick wall inwall are cleaned out, fast tubing nipple B port is connected to plug and also seal 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 the whole outer hole of earthen backfill successively compacting, complete shutoff.
2. Oil/gas Well drainage as claimed in claim 1 shutoff method with pressure, is characterized in that, in described step 2, drains and once cheats prodelta clay water every 20min.
3. Oil/gas Well drainage as claimed in claim 1 shutoff method with pressure, it is characterized in that, in the time carrying out described step 2, near first cheating outside feather edge, dig one first hole of drawing water, and dig one second hole of drawing water in ferrule boot, then from upwards iron rust and the greasy dirt of cannula cleaning external surface of ferrule boot, by smooth to the bottom in outer hole and wall cleaning.
4. Oil/gas Well drainage as claimed in claim 1 shutoff method with pressure, is characterized in that, described step 3 specifically comprises the following steps:
Step 3.1: fragment of brick is fully soaked; The wall base is washed away smooth clean, outwards extract ponding out from second of the ferrule boot hole of drawing water, until the end of building a wall simultaneously;
Step 3.2: taking sleeve pipe center line as the center of circle, build annular interior wall between hole and sleeve pipe outside, and stay an aperture as drainage tunnel at the bottom of wall; Build a wall and use the sufficient pouring of cement mortar, the enough grouting of body of wall basal plane and 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 drains ponding;
Step 3.4: prepare a tubing nipple A, seal with steel plate one end, and near this end beat multiple holes make screen casing ensure draining unimpeded, the other end is evenly coated dope and is tightened valve, tubing nipple A is penetrated to drainage tunnel under wall, be laid in interior wall bottom, punching end contacts with sleeve pipe, by clean the foreign material complete liquidation at the bottom of the hole between interior wall and sleeve pipe and on sleeve pipe; Drainage tunnel internal face at the bottom of wall is cleaned out, then from inside to outside drainage tunnel is blocked several times with fast blockage spirit, water can only be flowed out in the hole from tubing nipple A;
Step 3.5: prepare an annular steel plate, be cut to equal-sized two, two block plates are lain in to the bottom between sleeve pipe and interior wall, with two U-shaped cards and two stay bolts, two block plates are connected and fixed respectively, 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, in described step 3.2, the siccative volume ratio of cement mortar is cement: quartz sand=1:1; In described step 3.3, build a wall first 4 hours that finish, the ponding of draining one time per hour, then drains one time ponding for every 2 hours; In described step 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, it is characterized in that, in described step 4, early strong Silica fume grout formula is, dry ash: silica flour: caustic soda: early strength admixture: mass ratio=75:25:5:5:1.8 of filtrate loss reduction additive J-36, cement paste proportion 1.85g/cm
3; Silica fume grout formula is, dry ash: silica flour: mass ratio=75:25:1.8 of filtrate loss reduction additive J-36, cement paste proportion 1.75g/cm
3.
7. Oil/gas Well drainage as claimed in claim 1 shutoff method with pressure, is characterized in that, in described step 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, in described step 6, the proportion of expansion cement slurry is 1.51g/cm
3, the volume ratio that consists of cement dry ash, expansive soil and water 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, within described step 6 every 2 hours, sprays a clear water, and water spray dynamics must not be broken up cement paste; It is 10cm that fast blockage spirit envelope is filled with thickness.
10. Oil/gas Well drainage as claimed in claim 1 shutoff method with pressure, is characterized in that, seals grouting liquid height higher than plug top 15cm in described step 7, above covers fragment of brick.
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