CN100572492C - Self-breaking glue solution body plug horizontal well in segments perforating and fracturing technology and plug - Google Patents
Self-breaking glue solution body plug horizontal well in segments perforating and fracturing technology and plug Download PDFInfo
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- CN100572492C CN100572492C CNB2008101056422A CN200810105642A CN100572492C CN 100572492 C CN100572492 C CN 100572492C CN B2008101056422 A CNB2008101056422 A CN B2008101056422A CN 200810105642 A CN200810105642 A CN 200810105642A CN 100572492 C CN100572492 C CN 100572492C
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Abstract
Self-breaking glue solution body plug horizontal well in segments perforating and fracturing technology and plug are applied to oil-gas field horizontal well in segments pressure break.Feature is: the plug preparation process is divided into: the agent of preparation guanidine rubber powder, and preparation guanidine matrix liquid, guanidine matrix liquid pulvis and linking agent are made water-soluble three steps of self-breaking glue solution body plug.The segmenting perforating fracturing technology at first is lowered to the most the lower layer of stratum of horizontal well with the perforating and fracturing tubing string, adopts hydrojet to carry out the segmenting perforating pressure break and presses off the most the lower layer of stratum.Inject water-soluble self-breaking glue solution body plug then.On carry the perforating and fracturing tubing string to the second layer.Adopt hydrojet to carry out the segmenting perforating pressure break and press off horizontal well second layer stratum.Finish pressure break multilayer stratum.Effect is: this plug can bear certain pressure reduction in use, and heat resistance is good, and gelation time is adjustable, and can break glue automatically, and the broken glue time is controlled, and the effective shutoff in the time of can realizing pressure break realizes horizontal well in segments (layer) pressure break.
Description
Technical field
The present invention relates to oilfield perforating and fracturing technical field, the water-soluble self-breaking glue solution body of particularly a kind of oil-gas field horizontal well plug is assisted segmenting perforating pressure break novel process.
Background technology:
Oilfield horizontal well need often carry out the multistage staged fracturing, improves the drainage area on stratum, improves crude production rate and recovery ratio.Adopt the segmenting perforating fracturing technology can realize staged fracturing, the intact the first layer of pressure break often needs lower floor is carried out the shutoff operation when the pressure break upper strata.The shutoff mode has pkr+capping tools (bridging plug) and liquid gum plug etc.Pkr+capping tools (bridging plug) long construction period, instrument removes and has a big risk; In the liquid gum plug shutoff operation, particularly existing plugging agent, often intensity is too high, can not soften brokenly glue, need bore the plug operation, and the injury to reservoir in the operation process is often very big.Traditional hydrojet staged fracturing technology when pressure break the preceding paragraph, is unimpeded between the levels, and fluid only depends on hydrojet to carry out orientation, fluid inevitably can occur and carry out leak-off to the crack that lower floor has pressed off.
For this reason, in hydrojet segmenting perforating pressing crack construction, adopt water-soluble self-breaking glue solution body plug shutoff lower floor, prevent that liquid from entering, aquation or the de-plugging of employing chemical process aquation automatically again is little to the injury on stratum after waiting to have pressed, and can realize the horizontal well in segments perforating and fracturing easily.
The Chinese patent publication number is CN1869149A, discloses a kind of high density fracturing liquid, has adopted inorganic salt, guar gum, linking agent and gel breaker etc. to form fracturing liquid.
Summary of the invention:
The objective of the invention is to be oil-gas field self-breaking glue solution body plug horizontal well in segments perforating and fracturing technology and plug, it realizes pressure break by hydrojet, water-soluble self-breaking glue solution body plug cuts off the passage of lower floor's fluid and top fluid, can make things convenient for succinct realization horizontal well multistage to separate pressure break, form many hydraulic fractures at horizontal section, construction period is shortened, separate pressure break efficient height than machine tool, littler than traditional liquid plug back-up sand staged fracturing to the injury of reservoir, more effective than the separation of traditional hydrojet pressure break.
The technical solution used in the present invention is: the water-soluble self-breaking glue solution body of a kind of oil-gas field plug, and water-soluble self-breaking glue solution body plug is made up of guanidine matrix liquid and linking agent potassium bichromate, and guanidine matrix liquid and linking agent potassium bichromate weight part ratio are 100: 0.3～0.6;
Described guanidine matrix liquid is made up of water, the agent of guanidine rubber powder, fenugreek gum, ammonium persulphate, and the weight part ratio of water, the agent of guanidine rubber powder, fenugreek gum and ammonium persulphate is 100: 2～3: 2～3: 0.1～0.5;
The agent of described guanidine rubber powder is made up of hydroxypropyl guanidine that rubber powder and borax, and hydroxypropyl guanidine that rubber powder and borax weight part ratio are 2～3: 0.4～0.6.
Water-soluble self-breaking glue solution body plug preparation process is divided into: the agent of preparation guanidine rubber powder, and preparation guanidine matrix liquid, guanidine matrix liquid pulvis and linking agent are made water-soluble self-breaking glue solution body plug three steps:
A, the agent of preparation guanidine rubber powder: the agent of guanidine rubber powder is made up of hydroxypropyl guanidine that rubber powder and borax, and its weight part ratio is 2～3: 0.4～0.6; Mix.The limited Duties of carat Mary Yi Xinke Australia chemical industry (collection Mission) appoints company and long celebrating chemical plant, down-hole that hydroxypropyl guanidine that rubber powder product is arranged.
B, preparation guanidine matrix liquid: guanidine matrix liquid is made up of water, the agent of guanidine rubber powder, fenugreek gum and ammonium persulphate, and the weight part ratio of water, the agent of guanidine rubber powder, fenugreek gum and ammonium persulphate is 100: 2～3: 2～3: 0.1～0.5.At first water and the agent of guanidine rubber powder are stirred in jar; Then fenugreek gum is added in the jar and stir; Adding ammonium persulphate at last stirs.Preparation guanidine matrix liquid under normal temperature, condition of normal pressure.There is the fenugreek gum product in Sixian County, Anhui Province vegetable jelly limited liability company.
C, guanidine matrix liquid and linking agent are made water-soluble self-breaking glue solution body plug: water-soluble self-breaking glue solution body plug is made up of guanidine matrix liquid and linking agent, and linking agent is a potassium bichromate.The weight part ratio of guanidine matrix liquid and linking agent potassium bichromate is 100: 0.3～0.6.The linking agent potassium bichromate is joined in the guanidine matrix liquid in proportion, stir while adding, within 10～30 minutes, adopt fracturing truck to inject into well, in well, become water-soluble self-breaking glue solution body plug.Well temperature is in the time of 40～60 ℃, and plug intensity reaches solid state, and plug can keep intensity 1～6h.The softening then and broken glue of plug, the viscosity of breaking glue solution is less than 50mPa.s.
Described water is fresh water or seawater.
Prepare water-soluble self-breaking glue solution body plug according to the down-hole actual requirement.The technician can finish by this compound method according to the down-hole actual requirement.
Oil-gas field self-breaking glue solution body plug horizontal well in segments perforating and fracturing technology is:
At first the perforating and fracturing tubing string is lowered to the most the lower layer of stratum of horizontal well, adopts hydrojet to carry out the segmenting perforating pressure break and press off the bottom jet segment of horizontal well, on carry perforating and fracturing tubing string to the second jet segment.After adopting fracturing truck water-soluble self-breaking glue solution body plug to be injected in the middle of first and second jet segments, treating that water-soluble self-breaking glue solution body plug becomes glue to seal lower floor, adopt hydrojet to carry out the segmenting perforating pressure break and press off second jet segment of horizontal well then.And then on carry three jet segments of perforating and fracturing tubing string to the, inject respectively in the middle of water-soluble self-breaking glue solution body plug to the second and the 3rd jet segment, after treating that water-soluble self-breaking glue solution body plug becomes glue to seal lower floor, adopt hydrojet to carry out the segmenting perforating pressure break and press off the 3rd jet segment of horizontal well.So continue to carry out,, can finish the fractured horizontal well multistage by upper lifting pipe post and injection plug.
In order to guarantee water-soluble self-breaking glue solution body plug, effective formerly fractured layer and ongoing fractured layer of packing, the distance between described first fractured layer and the ongoing fractured layer is between 70～800 meters.
Described the perforating and fracturing tubing string being lowered to the horizontal well stratum, adopting hydrojet to carry out the segmenting perforating pressure break and press off the horizontal well stratum, is prior art, and those skilled in the art knows.
The invention characteristics: the present invention it by horizontal well hydrojet segmenting perforating fracturing technology and water-soluble self-breaking glue solution body plug are carried out combination, utilizing hydrojet to carry out segmenting perforating pressure break connection does, adopt water-soluble self-breaking glue solution body plug to cut off two intersegmental fluid channels when pressure break, the separation when making pressure break is more effective.
The present invention has carried out the innovation aspect three on the horizontal well in segments fracturing reform.
1, segmenting perforating pressure break connection work is carried out in hydrojet
Utilize hydrojet technology to carry out the horizontal well perforation operation, oil jacket carries out frac job with annotating then, pressed the first layer, last pressure-raising splits drilling tool, carry out carrying drilling tool to second layer position in the operation of the second layer, adopt hydrojet to press off the horizontal well second layer, by that analogy, can work continuously, press off multilayer.
2, pressed and injected the fluid channel that water-soluble self-breaking glue solution body plug cuts off two interlayers behind one deck.Water-soluble self-breaking glue solution body plug is the shutoff that realizes two interlayers for better, increases the ability of artificial control staged fracturing.It is the most the lower layer of to adopt hydrojet to press off horizontal well, injects water-soluble self-breaking glue solution body plug then, on carry drilling tool to second layer position, after treating that liquid gum plug becomes glue to seal lower floor, adopt the segmenting perforating pressure break to press off the horizontal well second layer, by that analogy, can work continuously, press off multilayer.Having overcome traditional hydrojet staged fracturing technology, when the pressure break last layer, is unimpeded between the levels, and fluid only depends on hydrojet to carry out orientation, fluid occurs and carries out leak-off to the crack that lower floor has pressed off.The partition effect of water-soluble self-breaking glue solution body plug can effectively prevent the generation of this phenomenon, the validity that enhanced level well staged fracturing is separated.
Beneficial effect of the present invention: the present invention realizes the horizontal well fracturing of separate layers by hydrojet, water-soluble self-breaking glue solution body plug cuts off the passage of lower floor's fluid and top fluid, form many hydraulic fractures at horizontal section, construction period is shortened, separate pressure break efficient height than machine tool, littler than traditional liquid plug back-up sand staged fracturing to the injury of reservoir, more effective than the separation of traditional hydrojet pressure break.This plug can bear certain pressure reduction in use, and heat resistance is good, and gelation time is adjustable, and can break glue automatically, and the broken glue time is controlled, the effective shutoff in the time of can realizing pressure break.
Embodiment
Embodiment 1:
Prepare water-soluble self-breaking glue solution body plug:
A, the agent of preparation guanidine rubber powder: the agent of guanidine rubber powder is made up of hydroxypropyl guanidine that rubber powder and borax, and its weight part ratio is 2.5: 0.5; Mix.
B, preparation guanidine matrix liquid: guanidine matrix liquid is made up of fresh water, the agent of guanidine rubber powder, fenugreek gum and ammonium persulphate, and the weight part ratio of fresh water, the agent of guanidine rubber powder, fenugreek gum and ammonium persulphate is 100: 2.5: 2.5: 0.5.At first water and the agent of guanidine rubber powder are stirred in jar; Then fenugreek gum is added in the jar and stir; Adding ammonium persulphate at last stirs.Preparation guanidine matrix liquid under normal temperature, condition of normal pressure.
C, guanidine matrix liquid and linking agent are made water-soluble self-breaking glue solution body plug: linking agent is a potassium bichromate.The weight part ratio of guanidine matrix liquid and linking agent is 100: 0.6.Linking agent is joined in the guanidine matrix liquid in proportion, stir while adding, 25 minutes, adopt fracturing truck to inject into well, in well, become water-soluble self-breaking glue solution body plug.Well temperature is in the time of 45 ℃, and plug intensity reaches solid state, and plug can keep intensity 5h.The softening then and broken glue of plug, the viscosity of breaking glue solution is less than 50mPa.s.
According to the down-hole actual requirement, prepare water-soluble self-breaking glue solution body plug quantity.
Utilize water-soluble self-breaking glue solution body plug to carry out horizontal well in segments perforating and fracturing technology to be:
At first the perforating and fracturing tubing string is lowered to the most the lower layer of stratum of horizontal well, adopts hydrojet to carry out the segmenting perforating pressure break and press off the bottom jet segment of horizontal well, on carry perforating and fracturing tubing string to the second jet segment.After adopting fracturing truck water-soluble self-breaking glue solution body plug to be injected in the middle of first and second jet segments, treating that water-soluble self-breaking glue solution body plug becomes glue to seal lower floor, adopt hydrojet to carry out the segmenting perforating pressure break and press off second jet segment of horizontal well then.And then on carry three jet segments of perforating and fracturing tubing string to the, inject respectively in the middle of water-soluble self-breaking glue solution body plug to the second and the 3rd jet segment, after treating that water-soluble self-breaking glue solution body plug becomes glue to seal lower floor, adopt hydrojet to carry out the segmenting perforating pressure break and press off the 3rd jet segment of horizontal well.So continue to carry out,, can finish the fractured horizontal well multistage by upper lifting pipe post and injection plug.
Distance between elder generation's fractured layer and the ongoing fractured layer is 100 meters.
The weight part ratio of embodiment 2,3,4 and water-soluble each component of self-breaking glue solution body plug of 5 is listed as follows:
Embodiment 2,3,4 and each ingredients weight parts ratio of 5
The preparation method and the horizontal well in segments perforating and fracturing technology of embodiment 2,3,4 and 5 the water-soluble self-breaking glue solution body of oil-gas field plug, substantially the same manner as Example 1.
Claims (3)
1, the water-soluble self-breaking glue solution body of a kind of oil-gas field plug is characterized in that:
Water-soluble self-breaking glue solution body plug is made up of guanidine matrix liquid and linking agent potassium bichromate, and guanidine matrix liquid and linking agent potassium bichromate weight part ratio are 100: 0.3～0.6;
Described guanidine matrix liquid is made up of water, the agent of guanidine rubber powder, fenugreek gum, ammonium persulphate, and the weight part ratio of water, the agent of guanidine rubber powder, fenugreek gum and ammonium persulphate is 100: 2～3: 2～3: 0.1～0.5;
The agent of described guanidine rubber powder is made up of hydroxypropyl guanidine that rubber powder and borax, and hydroxypropyl guanidine that rubber powder and borax weight part ratio are 2～3: 0.4～0.6.
2, the water-soluble self-breaking glue solution body of oil-gas field as claimed in claim 1 plug is characterized in that: preparation process is divided into the agent of preparation guanidine rubber powder, preparation guanidine matrix liquid, and guanidine matrix liquid and linking agent are made water-soluble self-breaking glue solution body plug three steps:
A, the agent of preparation guanidine rubber powder: the agent of guanidine rubber powder is made up of hydroxypropyl guanidine that rubber powder and borax, and hydroxypropyl guanidine that rubber powder and borax weight part ratio are 2～3: 0.4～0.6; Mix;
B, preparation guanidine matrix liquid: guanidine matrix liquid is made up of water, the agent of guanidine rubber powder, fenugreek gum, ammonium persulphate, and the weight part ratio of water, the agent of guanidine rubber powder, fenugreek gum and ammonium persulphate is 100: 2～3: 2～3: 0.1～0.5; At first water and the agent of guanidine rubber powder are stirred in jar; Then fenugreek gum is added in the jar and stir; Adding ammonium persulphate at last stirs; Preparation guanidine matrix liquid under normal temperature, condition of normal pressure;
C, guanidine matrix liquid and linking agent are made water-soluble self-breaking glue solution body plug: water-soluble self-breaking glue solution body plug is made up of guanidine matrix liquid and linking agent, linking agent is a potassium bichromate, the weight part ratio of guanidine matrix liquid and linking agent potassium bichromate is 100: 0.3～0.6, the linking agent potassium bichromate is joined in the guanidine matrix liquid in proportion, stir while adding, within 10～30 minutes, the employing fracturing truck injects into well, in well, become water-soluble self-breaking glue solution body plug, well temperature is in the time of 40～60 ℃, plug intensity reaches solid state, plug can keep intensity 1～6h, the softening voluntarily and broken glue of water-soluble then self-breaking glue solution body plug forms liquid behind the broken glue, and the viscosity of liquid is less than 50mPa.s.
3, the water-soluble self-breaking glue solution body of oil-gas field as claimed in claim 1 plug is characterized in that: utilize self-breaking glue solution body plug to carry out horizontal well in segments perforating and fracturing technology to be:
At first the perforating and fracturing tubing string is lowered to the most the lower layer of stratum of horizontal well, adopt hydrojet to carry out the segmenting perforating pressure break and press off the bottom jet segment of horizontal well, on carry perforating and fracturing tubing string to the second jet segment, and then adopt fracturing truck that water-soluble self-breaking glue solution body plug is injected in the middle of first and second jet segments, after treating that water-soluble self-breaking glue solution body plug becomes glue to seal lower floor, adopt hydrojet to carry out the segmenting perforating pressure break and press off second jet segment of horizontal well; And then on carry three jet segments of perforating and fracturing tubing string to the, inject respectively in the middle of water-soluble self-breaking glue solution body plug to the second and the 3rd jet segment, after treating that water-soluble self-breaking glue solution body plug becomes glue to seal lower floor, adopt hydrojet to carry out the segmenting perforating pressure break and press off the 3rd jet segment of horizontal well, so continue to carry out, by upper lifting pipe post and injection plug, can finish the fractured horizontal well multistage.
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| CNB2008101056422A CN100572492C (en) | 2008-04-30 | 2008-04-30 | Self-breaking glue solution body plug horizontal well in segments perforating and fracturing technology and plug |
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| CNB2008101056422A CN100572492C (en) | 2008-04-30 | 2008-04-30 | Self-breaking glue solution body plug horizontal well in segments perforating and fracturing technology and plug |
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| CN101435318B (en) * | 2008-12-17 | 2013-01-23 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Non-drill cementing well method and pipe column |
| CN101975050B (en) * | 2010-09-17 | 2013-03-06 | 北京奥瑞安能源技术开发有限公司 | Construction method of coal bed gas horizontal well and vertical drainage well in multi-objective layer geologic environment |
| CN102086238B (en) * | 2010-12-27 | 2012-05-09 | 西安长庆化工集团有限公司 | Kneading method for preparing myristyl grafted carboxymethyl guar gum |
| CN102071922B (en) * | 2011-01-15 | 2013-07-03 | 胜利油田鲁明油气勘探开发有限公司 | Low permeable oil deposit virtual horizontal well development method |
| CN102746837A (en) * | 2012-01-13 | 2012-10-24 | 宫立武 | Microsphere temporary plugging agent for leakage oil well |
| CN103867177A (en) * | 2012-12-14 | 2014-06-18 | 中国石油天然气股份有限公司 | Horizontal well fracturing method |
| CN106321050A (en) * | 2015-06-30 | 2017-01-11 | 中国石油化工股份有限公司 | High efficiency fracturing method using coiled tubing water-jet and soluble rubber plugs |
| CN108373914A (en) * | 2018-01-11 | 2018-08-07 | 燕山大学 | A kind of preparation method of the fracturing fluid thickener with self destruction effect |
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| CN109294539B (en) * | 2018-09-25 | 2021-03-09 | 中国石油天然气股份有限公司 | Fire flooding well environment-friendly channeling sealing agent and preparation method and application thereof |
| CN112302604B (en) * | 2019-07-31 | 2023-01-24 | 中国石油化工股份有限公司 | Horizontal well subsection repeated fracturing method and application thereof |
| CN113088271B (en) * | 2021-04-09 | 2022-11-01 | 中国石油天然气股份有限公司 | Sulfur-resistant liquid rubber plug and preparation method thereof |
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