CN102828721A - Technology for selectively improving cementing quality of shale gas horizontal well - Google Patents

Technology for selectively improving cementing quality of shale gas horizontal well Download PDF

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Publication number
CN102828721A
CN102828721A CN 201210334796 CN201210334796A CN102828721A CN 102828721 A CN102828721 A CN 102828721A CN 201210334796 CN201210334796 CN 201210334796 CN 201210334796 A CN201210334796 A CN 201210334796A CN 102828721 A CN102828721 A CN 102828721A
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China
Prior art keywords
shale gas
sleeve pipe
horizontal well
technology
gas horizontal
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CN 201210334796
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Chinese (zh)
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李黔
赵建国
尹虎
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Southwest Petroleum University
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Southwest Petroleum University
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Priority to CN 201210334796 priority Critical patent/CN102828721A/en
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Abstract

The invention relates to a technology for selectively improving cementing quality of a shale gas horizontal well. The invention adopts the technical scheme that a cementing pipe string is formed by combining an API (American Petroleum Institute) bushing, retractable expansion compensation parts, special bushings, secondary expandable ball cyclone bushing centering devices, a switchable fracturing slide sleeve, a packer ball seat, a pressure difference slide sleeve and a guiding shoe. The technology has beneficial effects that some positions are selectively packed and cemented, so that the application quantity of the centering devices can be reduced, the descending safety is improved, the cementing quality satisfying the segmental fracture of the shale gas horizontal well can be greatly improved, the channeling phenomenon caused by the fracture of a cement ring in the segmental fracturing can be avoided, a favorable underground environment can be provided for the subsequent yield increase measures, the efficiency and quality in fracturing can be improved, and the mining efficiency of shale gas can be improved.

Description

Shale gas horizontal well selectivity improves the technology of cementing quality
Technical field
The present invention relates to the technology that shale gas horizontal well selectivity improves cementing quality.
Background technology
Shale gas is meant the natural gas of exploiting out from the rammell, is a kind of important unconventional gas resource.Whole world stock number reserves are about 456,000,000,000,000 m 3, be 2 times of conventional gas stock number.According to expert's estimation, China's shale gas can be adopted about 26,000,000,000,000 m of stock number 3, mainly be distributed in Sichuan, Erdos, tell the Kazakhstan, oil-gas bearing basin such as Tarim Basin and Zhunger Basin.The shale gas exploitation of China is scarcely out of swaddling-clothes, and present scale of investment also is not very big, but certainly, next domestic main oil play all can strengthen the exploitation dynamics to shale gas.Estimate that according to Ministry of Land and Resources to the year two thousand twenty, domestic shale gas annual production will reach 15,000,000,000~30,000,000,000 m 3, the year two thousand thirty reaches 1,100 hundred million m 3, shale gas will account for 25% of Chinese natural gas total output when the time comes.And shale gas mainly is faced with the difficult problem of production technique aspect; Because shale gas compactness is better, permeability is very low, and shale gas output is very low under the pit shaft mining conditions identical with conventional gas and oil; For improving the output of shale gas, shale gas need be exploited with horizontal well usually.The horizontal well cost is 1.5~2.5 times of straight well, initial exploitation rate, control reserves and finally to estimate recoverable reserves but be 3~4 times of straight well; The crossing chance of intrinsic fracture and artificial induction crack (being mainly vertical fracture) is big in horizontal well and the rammell, and the crack is remained in the reservoir purpose section.Statistics shows; Horizontal segment is 200m or when longer; Bore the chance of meeting the crack than straight well and Duo tens times, obviously improve the flow condition of reservoir fluid, the application of horizontal well technology can make the shale gas reservoir of free from flaw or few crack passage obtain the effective economic exploitation.Existing present shale gas horizontal well horizontal section length is generally 600-1500m; Minority can reach 3000m; If being carried out general pressure break, the shale gas net horizontal section then is difficult to obtain desirable fracturing effect; So the shale gas exploitation need be carried out staged fracturing usually to produce or to link up more reservoirs crack, increases the output of shale gas.
Shale gas horizontal well in segments packing property is to implement the prerequisite of staged fracturing, and cementing quality is directly determining shale gas horizontal well in segments packing property.The quality of cementing quality is mainly by casing centralization degree and displacement efficiency of cement slurry decision; Be to improve centralizer and displacement efficiency, conventional method is the eddy flow rigidity centralizer that on casing string, fills up enough amounts, and the installation that causes centralizer is 1 centralizer of 1 sleeve pipe at most; The rigidity of bunch tube increases greatly; Thereby increased the setting of casing risk, and centralizer is still limited, and the also difficult requirement of satisfying displacement efficiency of eddy flow rigidity centralizer eddy flow.Can shrink after cement paste solidifies during well cementation, the slit can occur between cement sheath and sleeve pipe, have a strong impact on the sealing performance between sleeve pipe and the cement sheath; Can add the pressure up to 70MPa in the staged fracturing process middle sleeve, sleeve pipe can produce distortion and since cement sheath be fragility easily by the distortion of sleeve pipe and crushed, therefore in the staged fracturing process, scurry groove easily.Because the inferior and casing deformation of cementing quality causes the part reservoir can not carry out abundant pressure break, can not form good crack, make the shale gas of these reservoirs be difficult to discharge, have a strong impact on fracturing effect, cause the output of shale gas and gas production efficient to reduce greatly.Hence one can see that, and the cementing quality of shale gas net horizontal section will determine the quality of the effect of staged fracturing, determines the height of its well yield and gas production efficient.Therefore the well section cementing quality of improving the standard is the prerequisite that improves the staged fracturing effect, improves the prerequisite of well yield and gas production efficient especially.
The shale gas horizontal well selectivity that the present invention designs improves the technology of cementing quality; Through log analysis net horizontal section is carried out effective segmentation; The part selectivity well cementation of separating at needs after the segmentation, promptly specific aim improves needing the cementing quality of packing section.Because the present invention is optionally well cementation, so can install less on the sleeve pipe to the interval that needs pressure break centralizer even is not installed; Owing to reduced the packing density of centralizer, reduced the integral rigidity of bunch tube, sleeve pipe is lowered to easily, reduce the setting of casing risk.This technology can effectively improve the cementing quality of staged fracturing, can improve the effect of staged fracturing greatly, obviously improves the gas production and the gas production efficient of shale gas, practices thrift the well cementation cost greatly.
Summary of the invention
The invention solves the inferior problem of scurrying groove when the pressure break of shale gas horizontal well in segments pressure break cementing quality; The expansible ball eddy flow of the secondary centralizer that adopts can obviously reduce the frictional resistance that casing string is lowered to; Initiative is used special sleeve pipe and the expansible ball eddy flow of secondary centralizer simultaneously; Can conventional centralizer centralizer be brought up to above 90% again, compare with conventional centralizer centralizer and improve more than 70%, mud produces eddy flow when cementing the well simultaneously in the expansible ball eddy flow of secondary centralizer; Can significantly improve the displacement efficiency of cement paste, improve cementing quality greatly; Subsidize through imbibition in the gap of shrinking when utilizing convergent-divergent compensation sealing part that cement paste is solidified; When carrying out pressure break; Convergent-divergent compensation sealing part pressurized shrinks, and reduces to be delivered to the casing pressure on the cement sheath, prevents that cement sheath from being squeezed by sleeve pipe to split and scurry groove.
The present invention is achieved in that A. is lowered to the well cementation pipe string that shale gas horizontal well selectivity improves cementing quality, delivers glueballs and sit (6) with the centralizer ball to cooperate, and builds the pressure, and the expansible ball eddy flow of secondary casing stabbing board (5) is set upright sleeve pipe; B. anti-binder removal ball, well-flushing injects microdilatancy elastic cement slurry system, and well cementation finishes.
Said: the microdilatancy elastic cement slurry system of injection has the performance of small expansion at process of setting; Can make cement sheath tightly touch sleeve pipe; And the modulus of elasticity of cement sheath surpasses 60GPa, produces annular clearance in the time of effectively preventing pressure break, increases the segmented seal performance of cement sheath greatly.
Said: at API sleeve pipe (1) but go up, sit (6) pressure reduction sliding sleeve (7), one way valve (8), guide shoe (9) by switch pressure break sliding sleeve (2), special sleeve pipe (3), convergent-divergent compensation sealing part (4), the expansible ball eddy flow of secondary casing stabbing board (5), centralizer ball and be assembled; It is characterized in that: the expansible ball eddy flow of secondary casing stabbing board (5) is installed in special sleeve pipe (3) two ends, and convergent-divergent compensation sealing part (4) is wrapped in special sleeve pipe (3) external surface.
Said: special sleeve pipe (3) length 5-6m, modulus of elasticity surpasses 200GPa, and 3-5 Gent system sleeve pipe (3) is installed with 3-7 root API sleeve pipe (1) at interval, and selectivity is to non-homogeneous some fracturing sections and the interval isolation of being divided into of shale gas horizontal well.
Said: the expansible eddy flow casing stabbing board of secondary (5) maximum outside diameter when setting of casing reduces, the bunch tube expansible eddy flow casing stabbing board of secondary (5) maximum outside diameter increase and sleeve pipe set upright during down to the design level position.
Said: convergent-divergent compensation sealing part (4) has presses when making that cement sheath is pushed in casing deformation in wait to the cement solidifies back imbibition and sleeve pipe; The characteristic that the cement sheath tool slightly shrinks; Can effectively protect cement sheath under high pressure not crushed, prevent that fracturing fluid from scurrying groove in cement sheath by the distortion of sleeve pipe.
During work, when sleeve pipe is lowered in the process, the ball on the expansible ball eddy flow of the secondary casing stabbing board (5) contacts with well and rolls, and changes the sliding friction of centralizer and well into rolling friction; When the expansible ball eddy flow of secondary casing stabbing board was lowered to the design well depth, pitching was suppressed, and sat with the centralizer ball when glueballs to build the pressure when contacting, and the wiper block in the expansible ball eddy flow of the secondary casing stabbing board stretches out sets upright sleeve pipe, the anti-binder removal ball of pressure release, well-flushing; Cementing; Wait and coagulate, microdilatancy elastic cement slurry begins to expand, and the particular matter on convergent-divergent compensation sealing part (3) surface begins and cement reaction dissolving; When cement solidifies basically, dissolve fully, the part of convergent-divergent compensation sealing then (3) begins suction and microdilatancy takes place; During pressure break, sleeve pipe is because the pipe inner high voltage expands, and convergent-divergent compensation sealing part (3) is compressed and shrinks, and the distortion that sleeve pipe is taken place passes to convergent-divergent compensation sealing part (3), reduces the extruding to cement sheath.
Advantage of the present invention and beneficial effect are: use the expansible ball eddy flow of secondary casing stabbing board that the casing centralization degree is increased to more than 90, reduce sleeve pipe greatly and be lowered to the frictional resistance in the process, effectively improve the displacement efficiency of cement paste; Optionally the packing well cementation is carried out in some layer position; Reduce the number that centralizer uses; Can improve the cementing quality that satisfies shale gas horizontal well in segments pressure break greatly, in cement sheath, produce when avoiding staged fracturing and scurry groove, for follow-up well stimulation provides good subsurface environment; Efficient and quality when improving pressure break, the gas production efficient of raising shale gas.
Description of drawings
Fig. 1 is the technology pipe string sketch map that shale gas horizontal well selectivity improves cementing quality.
The specific embodiment
When sleeve pipe is lowered in the process, the ball on the expansible ball eddy flow of the secondary casing stabbing board (5) contacts with well and rolls, and changes the sliding friction of centralizer and well into rolling friction; When the expansible ball eddy flow of secondary casing stabbing board was lowered to the design well depth, pitching was suppressed, and sat with the centralizer ball when glueballs to build the pressure when contacting, and the wiper block in the expansible ball eddy flow of the secondary casing stabbing board stretches out sets upright sleeve pipe, the anti-binder removal ball of pressure release, well-flushing; Cementing; Wait and coagulate, microdilatancy elastic cement slurry begins to expand, and the particular matter on convergent-divergent compensation sealing part (3) surface begins and cement reaction dissolving; Dissolve fully when cement solidifies basically, the part of convergent-divergent compensation sealing then (3) begins suction and microdilatancy takes place; During pressure break, sleeve pipe is because the pipe inner high voltage expands, and convergent-divergent compensation sealing part (3) is compressed and shrinks, and the distortion that sleeve pipe is taken place passes to convergent-divergent compensation sealing part (3), reduces the extruding to cement sheath.

Claims (6)

1. a shale gas horizontal well selectivity improves the technology of cementing quality; It is characterized in that: A. is lowered to the well cementation pipe string that shale gas horizontal well selectivity improves cementing quality; Deliver glueballs and sit (6) and cooperate with the centralizer ball; Build the pressure, the expansible ball eddy flow of secondary casing stabbing board (5) is set upright sleeve pipe; B. anti-binder removal ball; Well-flushing, cementing is waited and is coagulated; Microdilatancy elastic cement slurry begins to expand; The particular matter on convergent-divergent compensation sealing part (3) surface begins and cement reaction dissolving, when cement solidifies basically, dissolves fully, and the part of convergent-divergent compensation sealing then (3) begins suction and microdilatancy takes place.
2. shale gas horizontal well selectivity according to claim 1 improves the technology of cementing quality; It is characterized in that: the microdilatancy elastic cement slurry system of injection has the performance of small expansion at process of setting; Can make cement sheath tightly touch sleeve pipe; And the modulus of elasticity of cement sheath surpasses 60GPa, produces annular clearance in the time of effectively preventing pressure break, increases the segmented seal performance of cement sheath greatly.
3. a shale gas horizontal well selectivity improves the technology of cementing quality and manages string; At API sleeve pipe (1) but go up, sit (6) pressure reduction sliding sleeve (7), one way valve (8), guide shoe (9) by switch pressure break sliding sleeve (2), special sleeve pipe (3), convergent-divergent compensation sealing part (4), the expansible ball eddy flow of secondary casing stabbing board (5), centralizer ball and be assembled; It is characterized in that: the expansible ball eddy flow of secondary casing stabbing board (5) is installed in special sleeve pipe (3) two ends, and convergent-divergent compensation sealing part (4) is wrapped in special sleeve pipe (3) external surface.
4. shale gas horizontal well selectivity according to claim 3 improves the technology and the pipe string of cementing quality; It is characterized in that: special sleeve pipe (3) length 5-6m; Modulus of elasticity surpasses 200GPa; 3-5 Gent system sleeve pipe (3) is installed with 3-7 root API sleeve pipe (1) at interval, and selectivity is to non-homogeneous some fracturing sections and the interval isolation of being divided into of shale gas horizontal well.
5. shale gas horizontal well selectivity according to claim 3 improves the technology and the pipe string of cementing quality; It is characterized in that: the expansible eddy flow casing stabbing board of secondary (5) maximum outside diameter when setting of casing reduces, the bunch tube expansible eddy flow casing stabbing board of secondary (5) maximum outside diameter increase and sleeve pipe set upright during down to the design level position.
6. shale gas horizontal well selectivity according to claim 3 improves the technology and the pipe string of cementing quality; It is characterized in that: convergent-divergent compensation sealing part (4) has presses when making that cement sheath is pushed in casing deformation in wait to the cement solidifies back imbibition and sleeve pipe; The characteristic that the cement sheath tool slightly shrinks; Can effectively protect cement sheath under high pressure not crushed, prevent that fracturing fluid from scurrying groove in cement sheath by the distortion of sleeve pipe.
CN 201210334796 2012-09-12 2012-09-12 Technology for selectively improving cementing quality of shale gas horizontal well Pending CN102828721A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104563873A (en) * 2014-12-11 2015-04-29 中国石油天然气股份有限公司 Downhole casing power guide device
CN106522876A (en) * 2016-12-14 2017-03-22 中国石油大学(北京) Cementing technique and well completion structure for shale gas well
CN106761443A (en) * 2016-12-20 2017-05-31 中国石油天然气集团公司 The assembled casing of casing deformation when preventing shale gas well fracturing
CN108979583A (en) * 2018-07-12 2018-12-11 马弘毅 A kind of sidetracked hole layer and section cementing unit and application method
CN111058796A (en) * 2019-11-25 2020-04-24 西南石油大学 Method for improving shale gas well oil layer casing well cementation quality
CN111395993A (en) * 2020-02-11 2020-07-10 中国石油天然气集团有限公司 Method for controlling fracturing deformation of horizontal casing of shale gas well

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104563873A (en) * 2014-12-11 2015-04-29 中国石油天然气股份有限公司 Downhole casing power guide device
CN104563873B (en) * 2014-12-11 2017-01-11 中国石油天然气股份有限公司 Downhole casing power guide device
CN106522876A (en) * 2016-12-14 2017-03-22 中国石油大学(北京) Cementing technique and well completion structure for shale gas well
CN106761443A (en) * 2016-12-20 2017-05-31 中国石油天然气集团公司 The assembled casing of casing deformation when preventing shale gas well fracturing
CN106761443B (en) * 2016-12-20 2018-08-10 中国石油天然气集团公司 The assembled casing of casing deformation when preventing shale gas well fracturing
CN108979583A (en) * 2018-07-12 2018-12-11 马弘毅 A kind of sidetracked hole layer and section cementing unit and application method
CN108979583B (en) * 2018-07-12 2020-11-17 福州宇卓科技有限公司 Sidetracking well layering and segmenting cementing device and using method
CN111058796A (en) * 2019-11-25 2020-04-24 西南石油大学 Method for improving shale gas well oil layer casing well cementation quality
CN111058796B (en) * 2019-11-25 2021-11-09 西南石油大学 Method for improving shale gas well oil layer casing well cementation quality
CN111395993A (en) * 2020-02-11 2020-07-10 中国石油天然气集团有限公司 Method for controlling fracturing deformation of horizontal casing of shale gas well

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Application publication date: 20121219

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