CN104975840B - Acid autogenous temperature for deep carbonate reservoirs complex acid fracturing process - Google Patents

Acid autogenous temperature for deep carbonate reservoirs complex acid fracturing process Download PDF

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CN104975840B
CN104975840B CN 201510342102 CN201510342102A CN104975840B CN 104975840 B CN104975840 B CN 104975840B CN 201510342102 CN201510342102 CN 201510342102 CN 201510342102 A CN201510342102 A CN 201510342102A CN 104975840 B CN104975840 B CN 104975840B
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acid
step
formation
injected
water
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CN104975840A (en )
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方裕燕
耿宇迪
米强波
张�雄
张泽兰
侯帆
焦克波
安娜
李春月
应海玲
何晓波
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中国石油化工股份有限公司
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Abstract

本发明涉及用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,包括下述工序:1)通过油管向地层中注入滑溜水;2)通过油管向地层中注入非交联压裂液;3)通过油管向地层中注入自生酸体系;4)通过油管向地层中低排量注入胶凝酸体系;5)通过油管向地层中注入滑溜水;其中,工序1)、2)、3)、4)、5)所注入的液体占注入地层总液体的体积比例分别为:工序1)中所述滑溜水占3‑10%,工序2)中所述非交联压裂液占40~60%,工序3)中所述自生酸体系占30~50%,工序4)中所述胶凝酸体系占3~10%,工序5)中所述滑溜水的体积比例为3~15%,其中体积单位均为m3。 The present invention relates to acid fracturing autogenous acid complex processes for high temperature deep carbonate reservoir, comprising the steps of: a) injecting into the formation through slickwater tubing; 2) injecting a non-crosslinked fracturing the formation through the tubing solution; 3) is injected into the formation through the tubing system from the acid generator; 4) gelled acid system is injected into the formation through low emission pipe; 5) is injected into the formation through the slick water pipe; wherein the step 1), 2), volume ratio of 3), 4), 5) the liquid injected into the formation of the total liquid accounts were: step 1) in said water comprises 3-10% slick, step 2) in the non-crosslinked fracturing fluids accounted 40 to 60%, step 3) from the acid generator in the system of 30% to 50%, step 4) in the gelled acid system accounts for 3 to 10% and the volume ratio of the step 5) in the range from 3 to slickwater 15%, wherein the volume of units are m3. 通过本发明提高导流能力达140md·m以上,高温深井碳酸盐岩储层深穿透效果明显。 By the present invention to improve the flow capacity of 140md · m or more, high temperature deep carbonate reservoir deep penetration effect.

Description

一种用于高温深井碳酸盐岩储层的自生酸复合酸压工艺 Acid autogenous temperature for deep carbonate reservoirs complex acid fracturing process

技术领域 FIELD

[0001] 本发明涉及油气田开发技术领域,具体涉及一种用于高温深井碳酸盐岩储层的自生酸复合酸压工艺。 [0001] The present invention relates to the field of oil and gas field development technology, particularly relates to a method for high-temperature acid autogenous deep carbonate reservoirs complex acid fracturing process.

背景技术 Background technique

[0002] 我国深层碳酸盐岩储层存在埋藏深、储层非均质性严重和基质含油性差等特点, 靠单一的酸压工艺或酸液体系难以获得理想的效果。 [0002] The presence of carbonate reservoirs buried deep depth, reservoir heterogeneity and poor severe oil and matrix characteristics, by a single press process or an acid acid system is difficult to obtain the desired results. 复合酸压技术是20世纪80年代末产生的一种新型的油气井增产、水井增注技术,该技术是在对油水井进行储层改造时,将不同的改造技术进行优势互补,更有效地实现增产增注。 Composite acid fracturing technology is a new oil and gas well stimulation the late 1980s produced by well injection technology, which is when the oil wells for reservoir transformation, the different transformation technologies complement each other more effectively increase output by injection. 复合酸压技术的应用大大提高了酸蚀裂缝的规模和导流能力,基本满足了高温深井碳酸盐岩储层增产改造的需要。 Application of the composite acid fracturing technology has greatly enhanced the ability to flow and the size of the etched fracture, basically meet the needs stimulations high temperature deep carbonate reservoirs.

[0003] 为适合我国深层碳酸盐岩储层酸压的需要,发展了不同类型的复合酸压技术:(1) 不同酸液体系的复合酸压施工;(2)酸压与水力加砂压裂的复合施工;(3)高能气体压裂与酸压的复合施工,这3种酸压方法无论是从工艺上还是从本质上都存在很大的不同。 [0003] The need for deep carbonate rock reservoir of acid fracturing, the development of different types of composite acid fracturing technology: (1) Construction of Composite Acid different pressure systems acid; (2) an acid and hydraulic pressure sand fracturing the composite construction; (3) construction of a composite high energy gas fracturing and acid fracturing, and acidizing these three methods is whether or there is a big difference from the process from nature.

[0004]为实现深穿透,克服高温深井碳酸盐岩储层酸岩反应速度快,酸压有效缝长短等难题,国内外研宄人员开展了大量的非常规酸液体系研宄,主要有自生酸、稠化酸、乳化酸和地面交联酸等,其中自生酸应用于高温井具有其它酸液体系不可比拟的优点。 [0004] In order to achieve deep penetration, high temperature deep carbonate reservoirs overcome fast acid-rock reaction speed, acid fracturing effective seam length and other problems at home and abroad study based on a large number of personnel to carry out a study based on unconventional acid system, the main self-acid generator, acid thickened, emulsified acid and the surface-crosslinked acid, wherein the acid used in high temperature self well has incomparable advantages over other acid systems.

[0005] 目前,常规的自生酸体系主要用于砂岩储层酸化,自生酸复合酸压工艺技术尚未在碳酸盐岩油藏开展研宄与应用。 [0005] Currently, a conventional acid system is mainly used for self acidified sandstone reservoirs, reservoirs carry a Subsidiary of acid fracturing technology has not been in situ CARBONATE acid complex.

发明内容 SUMMARY

[0006] 本发明人对于高温深井碳酸盐岩储层油田的开采进行了多方面的研宄。 [0006] The present inventors made various study based high temperature deep mining for oilfield carbonate reservoir rock. 这类油田的碳酸盐岩储层的温度在120 °C〜150°C,深度为4500m〜6500m的储层。 Temperature carbonate reservoirs in such field 120 ° C~150 ° C, the depth of the reservoir 4500m~6500m. 由于我国高温深井碳酸盐岩储层增产改造中存在一些问题,而难以实现深穿透: Due to the transformation of carbonate reservoir stimulation of high temperature deep in some problems, but difficult to achieve deep penetration:

[0007] (1)储层温度较高,酸岩反应速度快,酸液深穿透能力有限,导致酸蚀裂缝有效作用距离较短,不能有效沟通井底较远处储层,影响改造效果; [0007] (1) higher reservoir temperature, acid rock fast reaction speed, limited capacity to penetrate deep acid, resulting in an effective action etched fracture short distance, a longer distance can not effectively communicate downhole reservoir, the impact effect of reconstruction ;

[0008] (2)储层埋藏深、温度高,注酸管柱长,泵入过程中对金属设备的腐蚀速率较大,井下管柱破坏严重,且宜引入铁离子,产生沉淀损害地层。 [0008] (2) deeply buried reservoirs, high temperature, long strings acid injection pump during the corrosion rate of metal equipment is large, tubular string severely damaged, and should be introduced into the iron, precipitate formation damage.

[0009] (3)成熟的胶凝酸和乳化酸组合而成的复合酸压工艺技术实现了大排量、高泵压、 深穿透的目标,但栗注乳化酸时摩阻较高,导致井口泵压高,排量难以提高,井底施工压力难以达到地层的破裂压力。 [0009] (3) Mature gelled acid and a complex combination of emulsified acid acid fracturing technology to achieve a large displacement, high pressure pump, deep penetration of the target, but a higher friction when Li Note emulsified acid, resulting in high pressure wellhead pump, displacement is difficult to improve, construction bottomhole pressure is difficult to achieve fracture pressure of the formation.

[0010]本发明主要针对高温深井碳酸盐岩储层埋藏深、温度高,酸岩反应速度快,酸压有效缝长短,不能有效沟通井底较远处储层等难点,通过采用自生酸体系与胶凝酸体系进行复合酸压工艺,提高近井地带导流能力,降低金属设备的腐蚀速率,延缓酸岩反应速度,达到刻蚀裂缝端部实现深穿透的目的。 [0010] The present invention is primarily for high temperature deep carbonate reservoirs buried deep, high temperature, fast reaction rate of acid rock, acid fracturing effective slit length, the difficulty can not effectively communicate more distant downhole reservoir, etc., through the use of autogenous acid gelled acid system for composite system and acid fracturing process, to improve the near wellbore conductivity, decrease the corrosion rate of metal equipment, acid rock retard the reaction rate, to achieve the purpose of etching the fracture tip penetration depth.

[0011]具体的,本发明提供一种用于高温深井碳酸盐岩储层中开展自生酸复合酸压工艺技术,通过自生酸与其他酸液体系交替注入,在其他酸液保证近井地带导流能力的同时,栗入的自生酸体系进入地层后逐渐发生化学反应生成盐酸溶蚀岩石,解决酸岩反应过快的问题,大大提高沟通距井底较远处储层孔洞体的几率,满足深穿透刻蚀裂缝端部的需要,达到高温碳酸盐岩储层深部改造的目的,提高改造效率。 [0011] Specifically, the present invention provides a high temperature deep carbonate reservoirs acid complex to carry out autogenous pressure acid technology, by autogenous acid with other acid alternating injection system, to ensure that in the near wellbore area other acid conductivity at the same time, the chestnut into spontaneous chemical reaction generates acid dissolution system hydrochloric acid rock, acid rock reaction to solve the problem of excessive occur gradually into the ground, greatly improving the chances of more distant communication distance to the bottom hole reservoir body meet deep etching is required to penetrate cracks in the end portions, the purpose of high temperature carbonate reservoirs deep transformation, to improve the transformation efficiency.

[0012] 本发明采用的具体技术方案为,一种用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,包括下述工序: [0012] In particular aspect of the invention is used in a high temperature deep carbonate reservoirs for autogenous pressure acid complex acid process, comprising the steps of:

[0013] 1)通过油管向地层中注入滑溜水; [0013] 1) is injected into the formation through slickwater tubing;

[0014] 2)通过油管向地层中注入非交联压裂液,所述非交联压裂液含有质量百分比为0.5%的非交联改性黄原胶; [0014] 2) a non-crosslinked fracturing fluids injected into the formation through the tubing, the non-crosslinked fracturing fluids containing 0.5% by mass percentage of non-crosslinked modified xanthan gum;

[0015] 3)通过油管向地层中注入自生酸体系,所述自生酸组成为:50 %自生酸A剂+50% 自生酸B剂,其中所述百分比为体积百分比,所述自生酸A剂是多聚醛类物质中的一种,所述自生酸B剂是铵盐类物质中的一种; [0015] 3) injecting autogenous acid system, the self-generated acid composition to the formation through tubing: 50% from the acid generator agent A + 50% from the acid generator B agent, wherein the percentage volume percent, the autogenous acid A agent is a poly-aldehydes of the agent from the acid generator B is an ammonium salt of substances;

[0016] 4)通过油管向地层中低排量注入胶凝酸体系; [0016] 4) gelled acid system is injected into the formation through low emission pipe;

[0017] 5)通过油管向地层中注入滑溜水; [0017] 5) water is injected into the formation through the slippery tubing;

[0018]其中,工序1)、2)、3)、4)、5)所注入的液体占注入地层总液体的体积比例分别为: 工序1)中所述滑溜水占为3-10%,工序2)中所述非交联压裂液占40-60%,工序3)中所述自生酸体系占30-50%,工序4)中所述胶凝酸体系占3-10%,工序5)中所述滑溜水的体积比例为3-15%,其中体积单位均为m3。 [0018] wherein the step 1), 2), 3), 4), 5) the injected liquid volume ratio accounts for the total liquid injection formation are: Step 1) in said water comprises 3-10% slick, ) in step 2 of the non-crosslinked fracturing fluids 40-60%, step 3) from the acid generator in the system of 30-50%, step 4) in the gelled acid system accounted for 3-10%, step 5 volume ratio) in the slickwater is 3-15%, wherein the volume of units are m3.

[0019] 前述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其中,工序1)中,所注入的滑溜水组成为:0.2%非交联改性黄原胶+0.5%破乳剂环氧乙烷环氧丙烷共聚物+ 0.1%杀菌剂甲醛+清水,其中所述百分比为质量百分比;优选所述滑溜水的施工排量为0〜 3.0m3/min〇 [0019] for the self-generated high-temperature acid composite deep carbonate reservoirs acid fracturing process, wherein the step 1), the injected water slipperiness of: 0.2% of non-crosslinked modified xanthan +0.5 % ethylene oxide propylene oxide copolymer demulsifier + formaldehyde + 0.1% biocide water, wherein the percentages are percentages by mass; preferably the displacement of water slick construction of 0~ 3.0m3 / min〇

[0020]前述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其中,工序2)中,所注入的非交联压裂液组成为:0 • 5 %非交联改性黄原胶+0 • 5 %助排剂烷基酚聚氧乙烯醚+ 1.0%破乳剂环氧乙烷环氧丙烷共聚物+0.1%杀菌剂甲醛+清水,其中所述百分比为质量百分比;优选所述非交联压裂液的施工排量为3.0〜6.5m3/min。 [0020] The acid used in the self-generated high temperature deep carbonate reservoirs complex acid fracturing process, wherein the step 2), the injected non-crosslinked fracturing fluids consisting of: 0 • 5% non-crosslinked modified xanthan gum +0 • 5% drainage aid alkylphenol polyoxyethylene ether + 1.0% ethylene oxide propylene oxide copolymer demulsifier + formaldehyde + 0.1% biocide water, wherein the percentages are by mass; preferably, the non-crosslinked fracturing fluid displacement construction 3.0~6.5m3 / min.

[0021]前述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其中,工序4)中,所注入的胶凝酸体系的组成为:2〇%HCl+0 •8 %胶凝剂改性阳离子聚丙烯酰胺+2.0 %缓蚀剂碘化钾+1.0%助排剂烷基酚聚氧乙烯醚+1.0%铁离子稳定剂抗坏血酸+1.0%破乳剂环氧乙烷环氧丙烷共聚物,其余为水,其中所述百分比为质量百分比;优选胶凝酸体系的施工排量为1 •0 〜2.5m3/min。 [0021] the self-generated acid complex processes for high temperature deep acid fracturing of carbonate reservoirs, wherein the step 4), the composition of the gelled acid system is implanted: 2〇% HCl + 0 • 8% gelling agents modified cationic polyacrylamide + 2.0% + 1.0% KI inhibitor drainage aid alkylphenol polyoxyethylene ether + 1.0% ascorbic acid + ferric ion stabilizer 1.0% ethylene oxide propylene oxide copolymer demulsifier , the remainder being water, wherein the percentages are percentages by mass; preferably gelled acid system operational displacement is 1 • 0 ~2.5m3 / min.

[0022]前述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其中,工序5)中,所注入的滑溜水组成为:0.2%非交联改性黄原胶+0.5%破乳剂环氧乙烷环氧丙烷共聚物+ 0 • 1 %杀菌剂甲醛+清水,其中所述百分比为质量百分比;优选所述滑溜水的施工排量为1.5 [0022] The acid used in the self-generated high temperature deep carbonate reservoirs complex acid fracturing processes, wherein step 5), the injected water slipperiness of: 0.2% of non-crosslinked modified xanthan +0.5 % ethylene oxide propylene oxide copolymer demulsifier + 0 • 1% formaldehyde bactericide + water, wherein the percentages are percentages by mass; preferably the water operational displacement slick 1.5

[0023]前述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其中,工序1)和3)可交替多次进行。 [0023] The acid used in the self-generated high temperature deep carbonate reservoirs complex acid fracturing process, wherein the step 1) and 3) may be alternately performed a plurality of times.

[0024]前述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其中,工序3)和工序4)之间还包括注入滑溜水的工序,所述滑溜水组成为:0.2%非交联改性黄原胶+0.5%破乳剂环氧乙烷环氧丙烷共聚物+0.1%杀菌剂甲醛+清水,其中所述百分比为质量百分比。 [0024] The acid used in the self-generated high temperature deep carbonate reservoirs complex acid fracturing process wherein, between step 3) and step 4) further comprises the step of injecting slickwater, the slickwater composition: 0.2 % of a non-modified cross-linked xanthan gum + 0.5% ethylene oxide propylene oxide copolymer demulsifier + formaldehyde + 0.1% biocide water, wherein the percentages are percent by mass.

[0025]前述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其中,工序3)中,所述自生酸体系的施工排量为2.5〜7.0m3/min。 [0025] The acid used in the self-generated high temperature deep carbonate reservoirs complex acid fracturing processes, wherein, in the step 3), the self system is operational displacement acid 2.5~7.0m3 / min.

[0026]本发明优选非交联改性黄原胶体系作为前置液和压裂液对储层进行造缝,采用自生酸体系与胶凝酸体系进行复合酸压工艺,提高近井地带导流能力,降低金属设备的腐蚀速率,延缓酸岩反应速度,刻蚀裂缝端部实现深穿透。 [0026] The present invention is preferably non-crosslinked modified xanthan gum solution and the system as a pre-fracturing fluid reservoirs created fracture, using autogenous system and gelled acid system acid composite acid fracturing process, to improve conductivity near wellbore area flow capacity and reduce the corrosion rate of metal equipment, acid rock retard the reaction rate, etch the fracture tip to achieve deep penetration. 该工艺提高酸蚀有效作用距离及酸压造缝效率,增加沟通距井底较远处储层孔洞体的几率。 The etching process to improve the effective distance and acid fracturing fracture initiation efficiency, increasing the probability of more distant communication distance to the bottom of reservoir body bore.

附图说明 BRIEF DESCRIPTION

[0027]图1是本发明自生酸复合酸压工艺的流程示意图。 [0027] FIG. 1 is a schematic flow diagram of autogenous acid complex acid fracturing process of the invention.

[0028]图2是自生酸体系在不同温度下反应不同时间后的酸含量关系图。 [0028] FIG. 2 is a view of the relationship between the content of the acid from the acid generator system at different reaction temperatures at different times.

[0029]图3是盐酸含量为15%的自生酸、高温胶凝酸、变粘酸和转向酸4种酸液体系的酸蚀导流能力对比图。 [0029] FIG. 3 is a hydrochloric acid content of 15% from the acid generator, acid gelling temperature, and the variable steering mucic acid 4 kinds of acid etching CONDUCTIVITY comparison system of FIG.

[0030] 图4是TH10270井酸压施工曲线图。 [0030] FIG. 4 is a graph showing construction TH10270 acid fracturing wells.

具体实施方式 detailed description

[0031]对于高温深井碳酸盐岩储层,采用自生酸复合酸压工艺技术进行施工时,遵循如下的选井原则: [0031] For high temperature deep carbonate reservoirs, using the self-generated acid complex technology for acid fracturing construction, following the principles mentioned the following:

[0032] 1.地质条件: [0032] 1. geological conditions:

[0033] 1)地质上储集体与井眼距离小于150米,所选酸压井处在油气富集的条带上; [0033] 1) from the reservoir in the borehole geological less than 150 m, in the selected kill strip acid enriched hydrocarbon;

[0034] 2)地层温度为90°C-150°C碳酸盐岩储层。 [0034] 2) formation temperature is 90 ° C-150 ° C carbonate reservoirs.

[0035] 2.工程条件 [0035] 2. The project conditions

[0036] 1)固井质量合格; [0036] 1) cementing quality standards;

[0037] 2)套管无破损。 [0037] 2) the sleeve without damage.

[0038]本发明在高温深井储层,通过优选前置液和压裂液、优选自生酸生酸原材料,配合闭合酸化工艺技术,确定合理的关井时间和供液系统,开展自生酸体系与胶凝酸体系复合酸压工艺,提高近井地带导流能力,降低金属设备的腐蚀速率,延缓酸岩反应速度,刻蚀裂缝端部实现深穿透,达到沟通距井底较远处储层孔洞体的目的。 [0038] In the present invention, high temperature deep reservoir, preferably through a pad fluid and a fracturing fluid, the acid is preferably acid generator autogenous materials, acidified with closure technology, shut-in time is determined reasonable and the liquid supply system, and carry out self Acid System composite gelled acid system acid fracturing process, to improve the near wellbore conductivity, decrease the corrosion rate of metal equipment, acid rock retard the reaction rate, etch the fracture tip to achieve deep penetration, reach more distant communication distance to the bottom of reservoir the purpose of the hole body.

[0039]下面详细说明本发明的用于尚温深井碳酸盐岩储层的自生酸复合酸压工艺,以阐述本发明所采用的方法的特征以及证明本发明的效果。 [0039] The following detailed description of the present invention is used in carbonate reservoirs still warm deep autogenous pressure acid acid complex process, to illustrate the feature of the method employed in the present invention and to demonstrate the effect of the present invention.

[0040]高温深井碳酸盐岩储层存在埋藏深、温度高,酸岩反应速度快,酸压有效缝长短, 不能有效沟通井底较远处储层等问题。 [0040] The presence of high temperature deep carbonate reservoirs buried deep, high temperature, fast reaction rate of acid rock, acid fracturing effective slit length, a longer distance can not effectively communicate downhole reservoir problems. 为了在高温深井碳酸盐岩储层中同时实现深穿透和高导流能力,本发明人在油田现场从多方面对自生酸复合酸压工艺进行了研宄。 In order to achieve deep penetration and high conductivity at high temperatures while deep carbonate reservoirs, the present invention is in many ways from the oilfields acid complex acid autogenous pressure process was a Subsidiary.

[0041] 1、优选前置液和压裂液 [0041] 1, and preferably liquid fracturing fluid front

[0042]非交联的改性黄原胶压裂液具有较好的造缝能力,摩阻较低,且与0 • 45 %瓜胶滑溜水价格相近,因此该工艺中选用0.2%和0.5%的非交联改性黄原胶体系作为前置液和压裂液对储层进行造缝。 [0042] The non-crosslinked modified xanthan gum fracturing fluid has a better likelihood of fracturing, low friction, and is similar to guar gum 0 • 45% slickwater price, so that the selection process 0.2% and 0.5 % of non-crosslinked modified xanthan gum solution and the system as a pre-fracturing fluid reservoirs created fracture.

[0043]像压裂中常用的胍胶一样,黄原胶也是一种植物胶,由野油菜黄单胞杆菌发酵得到的“五糖重复单元”生物聚合物为黄原胶,在黄原胶分子上引入不同的阴离子基团(羧酸基、磺酸基)和阳离子基团(季铵盐基)后形成本技术中的改性黄原胶。 [0043] Like conventional fracturing as guar gum, xanthan gum is a plant, the Xanthomonas campestris fermentation of "pentasaccharide repeat unit" biopolymer is xanthan gum, the xanthan gum after the introduction of different anionic groups (carboxylic group, sulfonic acid group) and a cationic group (quaternary ammonium group) in the molecular form of the present technology modified xanthan gum. 非交联改性黄原胶体系是指溶液中未加入交联剂。 Non-crosslinked modified xanthan system refers to a crosslinking agent was not added.

[0044] 2、自生酸体系的选择依据 [0044] 2, autogenous selected depending on the acid system

[0045] 如图2和图3所示,图2是自生酸体系在不同温度下反应不同时间后的酸含量关系图,图3是盐酸含量为15 %的自生酸、高温胶凝酸、变粘酸和转向酸4种酸液体系的酸蚀导流能力对比图。 [0045] As shown in FIG. 2 and FIG. 3, FIG. 2 is a view of the content of the relationship between self-generated acid acid reaction system at different times at different temperatures, FIG. 3 is a hydrochloric acid content of 15% from the acid generator, acid gelling temperature, becomes mucic acid and steering capability comparison flow four kinds of etching system of FIG acid.

[0046] 从图2可看出,在恒定时间下,体系酸浓度随温度升高先迅速增加,130 °C后趋于平缓;在恒定温度下,酸浓度随反应时间延长逐渐升高,l5〇°C后酸浓度不再随时间发生较大变化。 [0046] As can be seen from Figure 2, at a constant time, acid concentration system to rapidly increase with temperature, 130 ° C after leveling off; at a constant temperature, acid concentration gradually increased with reaction time, L5 acid concentration no significant changes with time after the square ° C. 既要延缓酸岩反应速率,又要产生有效的酸蚀裂缝长度,并具有一定的裂缝导流能力,实现真正意义上的深度酸压,自生酸体系需在0.5h时具有一定的酸浓度,同时又不能在〇.5h内产生很高的酸浓度(5%<0.5h时酸浓度<18%)。 Necessary to retard the reaction rate of acid rock, but also to produce an effective etched fracture length, fracture conductivity and has a certain ability to achieve depth acid fracturing in the true sense, since the acid generator system is required to have a certain acid concentration at the time of 0.5h, while not generate a high acid concentration in the 〇.5h (5% <0.5h when the acid concentration <18%). 由图2中数据可知,自生酸体系适用于温度为90°C〜150°C的储层(12(TC〜150°C的高温储层),可达到深度酸压的目的。 Seen from the data in FIG. 2, the acid system is suitable for autogenous temperature reservoir 90 ° C~150 ° C (high-temperature reservoir 12 (TC~150 ° C), the depth of the object can be achieved in acid fracturing.

[0047] 从图3可看出,闭合压力低于20MPa时,自生酸体系导流能力高于其它酸液体系;闭合压力高于20MPa后,自生酸体系导流能力低于高温胶凝酸体系而高于变粘酸和转向酸体系。 [0047] As can be seen from FIG. 3, when the clamping pressure is lower than 20MPa, autogenous acid system flow capacity than other acid systems; the closing pressure higher than 20MPa, the self temperature acid system is lower than the conductivity gelled acid system but higher than the variable mucic acid and steering systems. 表明自生酸体系整体上酸蚀导流能力较好。 Show good self-etching ability diversion acid system as a whole.

[0048] 3、优选自生酸原材料 [0048] 3, preferably autogenous acid starting material

[0049] 通过在氯代烃衍生物水解、酰氯化合物水解及羰基化合物与金属盐的反应等三种技术方案中进行实验与筛选,最终选用高聚合度羰基化合物和盐类作为自生酸的原材料, 达到在地面基本不发生化学反应,在地层高温条件下逐渐反应生成盐酸,刻蚀裂缝端部的目的。 [0049] The experiment was carried out by screening the three chlorinated hydrocarbon derivatives aspect hydrolysis, hydrolysis and acid chloride compound with a metal salt of carbonyl compound or the like, the final selection of high degree of polymerization of carbonyl compounds and salts as starting materials autogenous acid, chemical reaction substantially to reach the ground occurs gradually reaction conditions the formation of hydrochloric acid at high temperature, the etching object of the fracture tip portion.

[0050] 4、确定复合酸压工艺技术的关井时间和供液系统 [0050] 4, to determine the composite acid fracturing technology of shut-in time and the liquid supply system

[0051] 借鉴前期施工井的储层温度、返排液pH值和关井时间,根据预施工井的储层温度确定合理的关井时间使自生酸体系在地层中完全反应。 [0051] Reference reservoir temperature pre-well construction, and the pH value flowback shut-in time, determine a reasonable time for the shut-situ formation of acid in the reaction system is completely in accordance with the temperature of the pre-construction of the reservoir wells. 由于自生酸配方是现场配制A、B剂半成品,为确保现场实现按照1:1比例注入,施工工艺中采用双供液车、独立供液系统进行自生酸体系的现场泵注。 Since autogenous acid formulation is site preparation A, B semi agent, to ensure that field to achieve a 1: 1 ratio of injection, dual construction process liquid supply cart, the liquid supply system independent autogenous acid infusion site system.

[0052] 其中,根据塔里木盆地中古I井(地层温度147°C)自生酸现场试验压后排液pH值监测情况确定合理的关井时间。 [0052] wherein, in accordance with well Tarim Middle I (formation temperature 147 ° C) from the acid generator field test solution pH and the back pressure is determined by a reasonable shut-in time. 中古I井关井135min (14:45停泵,17:00开井)后返排液pH值均为6,自生酸完全反应。 Well I shut Middle 135min (14:45 Stop the pump, 17:00 open wells) flowback after the pH value was 6, since the acid generator complete reaction. 鉴于该井地层温度高于本井(本井地层温度139°C),优化关井时间确定为180min。 In view of the well higher than the formation temperature of this well (this well formation temperature 139 ° C), determined to optimize the shut-in time 180min.

[0053] 4、配合闭合酸化工艺技术 [0053] 4, and acidified with closure technology

[0054] 工艺中注入不同类型的酸液体系进行复合酸压,为保证近井地带的导流能力,施工后期低排量栗入一定体积的胶凝酸体系进行闭合酸化。 [0054] The process of acid injection system for different types of composite pressure acid, for acidification in order to ensure the closure near wellbore conductivity, low post-construction into a volume displacement Li gelled acid system.

[0055] 根据以上研究结果,本发明提供如下一种用于高温深井碳酸盐岩储层的自生酸复合酸压工艺。 Autogenous acid [0055] The results of the above studies, the present invention provides a method for high temperature deep carbonate reservoirs complex acid fracturing process.

[0056] 具体地,如图1所示,本发明的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,包括下述工序: [0056] Specifically, as shown in FIG acid complex autogenous pressure Acid The process of the invention for high temperature deep carbonate reservoir, comprising the steps of:

[0057] 工序1):注入滑溜水 [0057] Step 1): injection slickwater

[0058] 在施工开始时向地层中注入滑溜水,控制滑溜水的排量在0〜3.0m3/min,优选阶梯提排量,排量以台阶式递增,具体阶梯提排量的步骤为:注入滑溜水的初始排量为〇〜 1.5m3/min,当井筒内三分之二高摩阻压井液被挤入地层后,使排量台阶式递增到1.5〜 3. OmVmin,从施工现场仪表车中观看栗压情况,估算井底破裂压力,当地层压开后停止提排量,保持排量在3 • Om3/min。 [0058] injected into the formation in slickwater construction starts, the control displacement in slickwater 0~3.0m3 / min, preferably mention displacement step, the displacement in stepped increments, the specific steps mentioned displacement step is: injection slickwater initial displacement 〇~ 1.5m3 / min, when two-thirds of a high friction control fluid is extruded into a wellbore formation, to make the displacement of the stepped increments 1.5~ 3. OmVmin, from the construction site car dashboard viewing chestnut pressure, the estimated bottom hole pressure breakage, stop mentioning the displacement of the local laminated open, keep the displacement of 3 • Om3 / min.

[0059]滑溜水〇〜1 • 5m3/min阶段排量,主要作用是将井筒内高摩阻压井液缓慢挤入地层,降低井□压力,有利于后期提排量压开地层;后期提高排量至1 • 5〜3 • Om3/min,是逐渐提排量以压开地层,然后,实施自生酸胶凝酸复合酸压改造,能够使自生酸酸压形成的人工裂缝向前延伸。 [0059] slickwater 〇~1 • 5m3 / min phase displacement, the main role is to control fluid of a high friction slowly squeezed into the formation in the wellbore, the well □ reduced pressure, provide beneficial late displacement pushed open formation; improving post displacement to 1 • 5~3 • Om3 / min, the pressure was gradually put in the displacement of the formation open, then, autogenous embodiment gelled acid fracturing acid complex acid, capable of forming autogenous pressure sour artificial fracture extending forwardly.

[0060]其中,所述滑溜水的组成为:清水+〇• 2%非交联改性黄原胶体系+〇. i %杀菌剂+ 0.5%破乳剂,其中所述百分比为质量百分比。 [0060] wherein said composition is slickwater: • 2% water + square uncrosslinked xanthan-modified system + i% bactericide billion + 0.5% demulsifier, wherein the percentages are percentages by mass.

[0061]这里所述的清水可以是油田用矿物质含量达标合格的清水,其K+、Na+等一价离子含量低于5000mg/L,Ca2+、Mg2+等二价离子含量低于l〇〇mg/L。 [0061] herein may be used in oil field water standards acceptable mineral content of water, which is K +, Na + and other monovalent ion content is less than 5000mg / L, Ca2 +, Mg2 + and other divalent ion content of less than l〇〇mg / L.

[0062]凡是本领域常用的用作杀菌剂、破乳剂的那些试剂均可用于本发明中,例如,杀菌剂可以为甲醛、戊二醛、季铵盐(十二烷基二甲基苄基氯化铵)、二溴-3-次氮基丙酰胺中的一种或复合物,破乳剂可以为聚氧丙烯聚氧乙烯嵌段共聚物、环氧乙烷环氧丙烷共聚物中的一种或复合物。 [0062] Any conventional in the art as antimicrobial agents, those agents may be used in the present invention, demulsifiers, for example, fungicides may be formaldehyde, glutaraldehyde, quaternary ammonium salts (dodecyl dimethyl benzyl ammonium chloride), dibromo-3-nitrilo propionamide or a composite, demulsifiers may be polyethylene polyoxypropylene polyoxyethylene block copolymer, ethylene oxide propylene oxide copolymer in a species or complex.

[0063]该工序注入的滑溜水的体积占注入地层总液体的体积比例为3〜10 %,其中体积单位为m3。 [0063] The step of injecting a volume of water representing slippery proportion of the total volume of the liquid injected into the formation is 3~10%, wherein the volume unit is m3.

[0064]工序2):注入非交联压裂液的工序 [0064] Step 2): step of injecting a non-crosslinked fracturing fluid

[0065]向地层裂缝中注入非交联压裂液,施工排量范围为3 • 0〜6.5m3/min;其中,所述非交联压裂液组成为:0 • 5 %非交联改性黄原胶+0 • 5 %助排剂+1 • 0 %破乳剂+0 • 1 %杀菌剂,其余为水,其中所述百分比为质量百分比。 [0065] Non-crosslinked fracturing fluids injected into the formation fracture, operational displacement range of 3 • 0~6.5m3 / min; wherein the non-crosslinked fracturing fluids consisting of: 0 • 5% non-crosslinked modified xanthan gum +0 • 5% drainage aids +1 • 0% demulsifier +0 • 1% biocide, balance water, wherein the percentages are percent by mass.

[0066]凡是本领域常用的用作助排剂、杀菌剂、破乳剂的那些试剂均可用于本发明中,例如,杀菌剂可以为甲醛、戊二醛、季铵盐(十二烷基二甲基苄基氯化铵)中的一种或复合物, 破乳剂可以为聚氧丙烯聚氧乙烯嵌段共聚物、环氧乙烷环氧丙烷共聚物中的一种或复合物,助排剂可以为氟碳类表面活性剂、烷基酚聚氧乙烯醚中的一种或复合物。 [0066] Any conventional in the art as drainage aid, bactericide, demulsifier may be used in the present invention, those agents, for example, fungicides may be formaldehyde, glutaraldehyde, quaternary ammonium salts (dodecyldi benzyl ammonium chloride) or a composite of one demulsifier may be polyethylene polyoxypropylene polyoxyethylene block copolymer, ethylene oxide propylene oxide copolymer or a composite, cleanup agent may be a fluorocarbon-based surfactant, a polyoxyethylene alkyl phenol ether, or a composite.

[0067]该工序注入的非交联压裂液的体积占注入地层总液体的体积比例为40%〜60%, 其中体积单位为m3。 [0067] The volume of non-crosslinked fracturing fluid injected in this step accounts for the proportion of the total liquid volume of the injection formation is 40% ~ 60%, wherein the volume unit is m3.

[0068]向地层裂缝中注入非交联压裂液,可造缝并扩展裂缝延伸。 [0068] Non-crosslinked fracturing fluids injected into the formation fracture, the fracture can be created fracture extends and expands.

[0069] 工序3):注入自生酸体系的工序 [0069] Step 3): Step autogenous acid injection system

[0070]向地层裂缝中注入自生酸体系,施工排量范围为2_5〜7_0m3/min;其中,所注入的自生酸组成为:50%自生酸A剂+50%自生酸B剂,其中所述百分比为体积百分比。 [0070] injected into the formation fracture autogenous acid system, operational displacement range 2_5~7_0m3 / min; wherein the implanted autogenous acid composition of: 50% from the acid generator agent A + 50% from the acid generator B agent, wherein the percentage volume percent.

[0071]自生酸A剂是多聚醛类物质,选自聚二甲氨基苯甲醛、聚六醛、多聚甲醛、多聚乙醛等中任意一种,自生酸B剂是铵盐类物质,选自氯化铵盐、二甲基二烯丙基氯化铵盐等中的任意一种。 [0071] A self agent is a polymeric acid aldehydes, any one selected from poly-dimethylaminobenzaldehyde, polyhexamethylene aldehydes, paraformaldehyde, acetaldehyde poly, self agent is an acid salt species B any one selected from ammonium salts, salts of dimethyl diallyl ammonium chloride and the like.

[0072]将自生酸体系以2.5m3/min的施工排量注入地层,在具体井口泵压无明显降低(栗压波动低于5MPa)的情形下,逐渐提高酸液排量至5 • 0〜7 • 〇m3/min,延缓酸岩反应速度,增加酸蚀裂缝距离,尽可能沟通到有裂缝、溶洞等处有利储集体,对裂缝端部进行刻蚀,实现深穿透、达到建产的目的;在5.0〜7.0m3/min的排量下注入一定量酸液后,出现井口泵压大幅降低(泵压降低值大于lOMPa),为了避免酸液在裂缝或溶洞等有利储集体的过量滤失,降低排量至3.5〜4 • OmVmin,使得酸液与人工裂缝中岩石反应,提高整个人工裂缝导流能力; 当酸液剩余液量低于2〇〜40m3时,为避免该排量下压裂车组吸入空气导致施工停止,故降低酸液排量至2.5〜3.5m3/min,满足酸液供给要求。 Case [0072] The acid generator system are injected from the formation to 2.5m3 / min displacement of construction, in particular without significantly lower wellhead pressure pump (Li pressure fluctuations less than 5 MPa), and acid displacement is gradually increased to 5 • 0~ 7 • 〇m3 / min, acid rock retard the reaction rate, increase the etched fracture from the cracks communication, cave, etc. as favorable reservoir, the end portions of the etched fracture, to achieve deep penetration, to build production Objective; after injection of a quantity of displacement in the acid 5.0~7.0m3 / min, there wellhead pump pressure greatly reduced (reduction value is greater than the pump pressure Lompa), in order to avoid an excess of acid in the filter cracks or the like cave is favorable reservoir loss, to reduce emissions 3.5~4 • OmVmin, so that the rock is reacted with the acid in artificial fractures, fracture conductivity increase overall artificial; when the remaining amount of acid solution is less than 2〇~40m3 time, avoid the displacement of the group cause fracturing of the intake air to stop construction, so reducing acid emissions to 2.5~3.5m3 / min, supplied to meet the requirements of the acid.

[0073]该工序注入的自生酸体系的体积占注入地层总液体的体积比例为3〇%—50%,其中体积单位为m3。 [0073] The volume of the injection step autogenous acid system accounts for the total liquid volume ratio in the injection formation is 3〇% -50%, wherein the volume unit is m3.

[0074] 工序4):注入胶凝酸体系的工序 [0074] Step 4): step of injecting the gelled acid system

[0075] 向地层中注入胶凝酸体系,施工排量范围为1 •〇〜2.5m3/min。 [0075] injected into the formation gelled acid system, operational displacement range of 1 • 〇~2.5m3 / min.

[0076]注胶凝酸阶段,根据具体井的压力情况,在能达到闭合酸化工艺的要求下,此工序中可采用阶梯提排量注入酸液体系。 [0076] Note gelled acid stage, according to the specific pressure conditions of the well, to achieve closure in the acidification process the request, may be employed in this step is a step displacement mentioned acid injection system. 具体阶梯提排量的步骤为:注入胶凝酸的初始排量为1 •0〜1.5m3/min,从施工现场仪表车中观察栗压,估算该井井底压力,当井底压力值远低于(大于5MPa)该井裂缝闭合压力时,使排量台阶式递增到1 • 5〜2 • 5m3/min,当井底压力值略低于(在1〜2MPa范围内)该井裂缝闭合压力时停止提排量,保持排量在2.5m3/min。 Specific mention displacement step is the step: injecting an initial displacement of gelled acid 1 • 0~1.5m3 / min, the pressure was observed from Li car dashboard in the construction site, to estimate the well bottom hole pressure, bottom hole pressure as far less than (greater than 5 MPa) when the fracture closure pressure of the well, so that the displacement of the stepped increments to 1 • 5~2 • 5m3 / min, when the well bottom hole pressure value slightly lower than the fracture is closed (in the range 1~2MPa) mention displacement pressure stops, the displacement remains at 2.5m3 / min.

[0077]采用低排量注酸是为降低人工裂缝内净压力,诱使人工裂缝缓慢闭合,由此可实施闭合酸化工艺,提高近井地带导流能力。 [0077] The low-emission to reduce the net acid injection is an artificial fracture pressure, slow induce artificial fracture closure, whereby the closure acidification embodiment, to improve conductivity near wellbore area.

[0078]其中,所注入的酸液只要是具有刻蚀岩石、提高导流能力的酸液均可用于本工序, 其中,所述酸液中的酸成分可以是盐酸、低浓度氢氟酸(质量百分比为2%)、醋酸、磷酸中的一种或复合酸,优选盐酸;酸液中的酸成分是质量百分比为I5%〜20%的盐酸。 [0078] where, as long as the injected acid etching rock having improved conductivity acid can be used in the present step, wherein the acid component of the acid may be hydrochloric acid, a low concentration of hydrofluoric acid ( 2% by mass), acetic acid, phosphoric acid or a complex acid, preferably hydrochloric acid; the acid in the acid component is a mass percentage of I5% ~20% hydrochloric acid. 本发明注入的酸液优选胶凝酸,其组成为:20 % HC1+0.8 %胶凝剂+2 • 0 %缓蚀剂+1.0 %助排剂+1. 〇%铁离子稳定剂+1.0%破乳剂,其余为水,其中所述百分比为质量百分比。 The present invention is preferably injected acid gelled acid, consisting of:. 20% HC1 + 0.8% gelling agent +2 • 0% + 1.0% corrosion inhibitor + 1 square drainage aid ferric ion stabilizer% + 1.0% demulsifiers, the remainder being water, wherein the percentages are percent by mass.

[0079]凡是本领域常用的用作胶凝剂、助排剂、破乳剂、缓蚀剂和铁离子稳定剂的那些试剂均可用于本发明中。 [0079] Any commonly used as a gelling agent, a drainage aid, demulsifier, corrosion inhibitor and ferric ion stabilizer those agents in the art may be used in the present invention. 例如,胶凝剂可以为改性阳离子聚丙烯酰胺、乙烯丙烯类共聚物、聚_ N-乙烯吡咯烷酮、AMPS/AM/DMAM共聚物中的一种或复合物,缓蚀剂可以为曼西尼碱、咪唑啉季氨盐、月桂醛、含烷基吡啶化合物、醛酮胺缩合物、碘化钾、炔醇中的一种或复合物,铁离子稳定剂可以为抗坏血酸、乙二胺四乙酸及其钠盐、柠檬酸、醋酸、氮川三乙酸、抗坏血酸磷酸脂钠中的一种或复合物,破乳剂可以为聚氧丙烯聚氧乙烯嵌段共聚物、环氧乙烷环氧丙烷共聚物中的一种或复合物,助排剂可以为氟碳类表面活性剂、烷基酚聚氧乙烯醚中的一种或复合物。 For example, the gelling agent may be a modified cationic polyacrylamide, ethylene-propylene copolymers, poly _ N-vinyl pyrrolidone, AMPS / AM / DMAM copolymer or a composite, corrosion inhibitors may be Mancini base, quaternary ammonium salts of imidazolinium, lauric aldehyde, pyridine-containing alkyl compound, aldehyde and ketone amine condensates, potassium iodide, or an acetylenic alcohol compound, iron ion stabilizer may be ascorbic acid, ethylenediaminetetraacetic acid and salt, citric acid, acetic acid, nitrilotriacetic acid, sodium ascorbate or of one lipid compound, demulsifiers may be polyethylene polyoxypropylene polyoxyethylene block copolymer, ethylene oxide propylene oxide copolymer or a composite, drainage aids may be a fluorocarbon-based surfactant, a polyoxyethylene alkyl phenol ether, or a composite.

[0080] 该工序注入的胶凝酸体系的体积占注入地层总液体的体积比例为3%-10%,其中体积单位为m3。 [0080] The volume of the injection step gelled acid system the volume ratio of the total liquid injection accounted formation of 3% to 10%, wherein the volume unit is m3.

[0081] 为了使酸液进一步对远端裂缝进行刻蚀,加大深穿透效果,在工序3)之后,工序1) 和工序3)可交替进行。 [0081] In order to further distal acid etched fracture, increase deep penetration effect, after the step 3), step 1) and step 3) may be alternately performed.

[0082] 在工序3)和4)之间可以再次注入工序1)中的滑溜水,将工序3)中的自生酸体系顶入地层更深部,进一步对远端裂缝进行刻蚀,加大深穿透效果。 [0082] Between step 3) and 4) can be injected into slickwater Step 1) again, the autogenous acid system in the step 3) the top portion deeper into the formation, the distal end further etched fracture, increase deep penetrating effect. 优选地,所述滑溜水的施工排量为2〜3 • 0m3/min,所注入的滑溜水占注入地层总液体的体积比例为3〜10%。 Preferably, the displacement of slickwater construction 2~3 • 0m3 / min, accounting for water slipperiness injected volume ratio of the total liquid injection formation is 3~10%.

[0083] 工序5):注入滑溜水的工序 [0083] Step 5): a step of injecting slickwater

[0084]向地层中注入滑溜水,施工排量范围为2.5〜1.5tn3/min;其中,该工序注入的滑溜水与工序1)中注入的滑溜水的组成相同,其组成为:油田用矿物质含量达标的合格清水+ 0 •2 %非交联改性黄原胶体系+0 • 1 %杀菌剂+〇. 5 %破乳剂。 [0084] injected into the formation slickwater, operational displacement range 2.5~1.5tn3 / min; wherein the same composition 1) implanted in the step slickwater injected with slickwater step, consisting of: a mineral oil qualified standard substance content of water + 0 • 2% non-crosslinked xanthan-modified system +0 • 1% + billion fungicides. 5% demulsifier.

[0085]这里所述的清水可以是油田用矿物质含量达标合格的清水,其K+、Na+等一价离子含量低于5000mg/L,Ca2+、Mg2+等二价离子含量低于l〇〇mg/L。 [0085] herein may be used in oil field water standards acceptable mineral content of water, which is K +, Na + and other monovalent ion content is less than 5000mg / L, Ca2 +, Mg2 + and other divalent ion content of less than l〇〇mg / L.

[0086] 凡是本领域常用的用作杀菌剂、破乳剂的那些试剂均可用于本发明中,例如,杀菌剂可以为甲醛、戊二醛、季铵盐(十二烷基二甲基苄基氯化铵)、二溴-3-次氮基丙酰胺中的一种或复合物,破乳剂可以为聚氧丙烯聚氧乙烯嵌段共聚物、环氧乙烷环氧丙烷共聚物中的一种或复合物。 [0086] Any conventional in the art as antimicrobial agents, those agents may be used in the present invention, demulsifiers, for example, fungicides may be formaldehyde, glutaraldehyde, quaternary ammonium salts (dodecyl dimethyl benzyl ammonium chloride), dibromo-3-nitrilo propionamide or a composite, demulsifiers may be polyethylene polyoxypropylene polyoxyethylene block copolymer, ethylene oxide propylene oxide copolymer in a species or complex.

[0087] 注滑溜水阶段,从开始注滑溜水到滑溜水剩余量为5m3的时间内,以2. lm3/min的恒定排量注入滑溜水,主要作用是将井筒内胶凝酸液体系顶入地层,一是防止酸液腐蚀管柱, 二是充分利用酸液,让所有的酸液进入储层刻蚀岩石提高近井带导流能力。 [0087] Note slickwater stages, from the beginning of injection to slickwater slickwater 5m3 remaining amount of time, at a constant displacement 2. lm3 / min injected slickwater, the main role is to the top of the wellbore gelled acid system into the formation, first, to prevent acid corrosion of the column, the second is full use of the acid, so that all of the acid etched into the reservoir to improve the near-wellbore rock band conductivity. 当滑溜水剩余量低于5m3后,将排量降低至1.4〜1.6m3/min以防止高排量下压裂车组吸入空气导致施工停止。 When the remaining amount is below slickwater 5m3, to reduce the displacement 1.4~1.6m3 / min to prevent displacement of the high intake air cause fracturing group Construction stopped.

[0088] 该工序注入的滑溜水的体积占注入地层总液体的体积比例为3〜15%,其中体积单位为m3。 [0088] The step of injecting a volume of water representing slippery proportion of the total volume of the liquid injected into the formation is 3~15%, wherein the volume unit is m3.

[0089] 停止泵注,测录泵压降低值。 [0089] The injection pump is stopped, the measured value recorded in the pump pressure is reduced.

[0090] 另外,为了降低施工摩阻,在满足施工管柱强度要求的条件下,施工时采用3 1/2〃 大内径油管,例如可以采用3 1/2〃EUE外加厚油管/3 1/2〃TP-JC油管;同时在保证管柱安全的前提下,尽量减少下入油管的长度。 [0090] Further, the construction in order to reduce friction, the column under the conditions satisfying the strength requirements of the construction, using 3 1/2 〃 large inner diameter tubing construction, such as 3 1 / external upset tubing can be employed 2〃EUE / 31 / 2〃TP-JC tubing; column while ensuring safety of the premise, to minimize the length of the tubing.

[0091] 下面,举出实施例对本发明进一步描述,但本发明并不限于下述的实施例。 [0091] Next, an example embodiment of the present invention is further described, but the present invention is not limited to the following embodiments.

[0092]实施例 [0092] Example

[0093]以下通过对塔河油田的现场试验来详细说明本发明的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺。 [0093] The following field trials by oilfield TAHE be described in detail from the acid generator for high temperature deep carbonate reservoirs of the present invention is the composite acid fracturing process.

[0094] 对塔河油田TH10270井开展自生酸复合酸压工艺技术的酸压施工(保密试验) [0094] Well TH10270 Tahe oilfield construction autogenous pressure to carry out an acid acid fracturing technology acid complex (security test)

[0095]酸压施工栗注过程中所涉及到的液体组成如下,以下百分比如无特别说明,均指质量%。 Liquid [0095] Li an acid injection pressure during the construction involved the following composition, following percentages unless otherwise specified, refer to mass%.

[0096]滑溜水:采用北京世纪中星能源技术有限公司出售的型号为ZX-34的改性黄原胶及添加剂,其组成为:• 2 %改性黄原胶ZX-34+0 • 5 % ZX-11破乳剂+0 • 1 %杀菌剂+清水。 [0096] slick water: The Beijing Century Star Energy Technology Co., Ltd. to sell the model ZX-34 is a modified xanthan gum and additives, consisting of: • 2% xanthan gum modified ZX-34 + 0 • 5 % ZX-11 demulsifier +0 • 1% fungicide + water.

[0097]非交联压裂液:采用北京世纪中星能源技术有限公司出售的型号为ZX-34的改性黄原胶及添加剂,其组成为:〇• 5 %改性黄原胶ZX-34+0 • 5 %助排剂ZX-07+1 • 0 %破乳剂ZX-11+0.1 %杀菌剂+清水。 [0097] non-crosslinked fracturing fluids: The Beijing Century Star Energy Technology Co., Ltd. to sell the model ZX-34 is a modified xanthan gum and additives, consisting of: • 5% square modified xanthan gum ZX- 34 + 0 • 5% help schedule ZX-07 + 1 • 0% demulsifier ZX-11 + 0.1% + water bactericide.

[0098]自生酸:北京世纪中星能源技术有限公司的自生酸体系,其组成为:50 %自生酸A 剂ZX-368+50%自生酸B剂ZX-339,其中,ZX-368是多聚甲醛,ZX-339是氯化铵盐。 [0098] Self-acid: Beijing Century Star Energy Technology Co., Ltd. autogenous acid system, consisting of: 50% from the acid generator A agent ZX-368 + 50% from the acid generator B agent ZX-339, wherein, ZX-368 is a multi- POM, ZX-339 is the ammonium salt.

[00"] 胶凝酸:四川贝德石油技术发展有限公司的胶凝酸体系,其组成为:20 %HC1 + 0.8%BD1_6B胶凝剂+2.0%BDl_2〇缓蚀剂+1.0%BDl-5助排剂+1.0%BDl-2铁离子稳定剂+ 1.0%BDl-3破乳剂,其余为水。 [00 "] gelled acid: four Chuanbei De gelled acid system Petroleum Technology Development Co., Ltd., consisting of: 20% HC1 + 0.8% BD1_6B BDl_2〇 gelling agent + 2.0% corrosion inhibitor + 1.0% BDl-5 drainage aids + 1.0% BDl-2 ferric ion stabilizer + 1.0% BDl-3 demulsifiers, balance water.

[0100]另外,需要说明的是,凡是本领域常用的用作胶凝剂、破乳剂、杀菌剂、助排剂、铁离子稳定剂、缓蚀剂的那些试剂均可用于本申请中。 [0100] Further, it is noted that all commonly used as a gelling agent, demulsifier, bactericide, drainage aids, stabilizers iron, corrosion inhibitors are those agents present in the art may be used in the present application. 例如,胶凝剂可以为改性阳离子聚丙烯酰胺、乙烯丙烯类共聚物、聚-N-乙烯吡咯烷酮、AMPS/AM/DMAM共聚物中的一种或复合物,缓蚀剂可以为曼西尼碱、咪唑啉季氨盐、月桂醛、含烷基吡啶化合物、醛酮胺缩合物、碘化钾、 炔醇中的一种或复合物,铁离子稳定剂可以为抗坏血酸、乙二胺四乙酸及其钠盐、柠檬酸、 醋酸、氮川三乙酸、抗坏血酸磷酸脂钠中的一种或复合物,破乳剂可以为聚氧丙烯聚氧乙烯嵌段共聚物、环氧乙烷环氧丙烷共聚物中的一种或复合物,助排剂可以为氟碳类表面活性剂、烷基酚聚氧乙烯醚中的一种或复合物。 For example, the gelling agent may be a modified cationic polyacrylamide, ethylene-propylene copolymers, poly-vinylpyrrolidone -N-, AMPS / AM / DMAM copolymer or a composite, corrosion inhibitors may be Mancini base, quaternary ammonium salts of imidazolinium, lauric aldehyde, pyridine-containing alkyl compound, aldehyde and ketone amine condensates, potassium iodide, or an acetylenic alcohol compound, iron ion stabilizer may be ascorbic acid, ethylenediaminetetraacetic acid and salt, citric acid, acetic acid, nitrilotriacetic acid, sodium ascorbate or of one lipid compound, demulsifiers may be polyethylene polyoxypropylene polyoxyethylene block copolymer, ethylene oxide propylene oxide copolymer or a composite, drainage aids may be a fluorocarbon-based surfactant, a polyoxyethylene alkyl phenol ether, or a composite.

[0101] 具体的,对TH10270井进行自生酸复合酸压工艺的施工工序为: [0101] Specifically, the step for the construction of wells TH10270 autogenous acid complex is acid fracturing process:

[0102] TH10270井奥陶系一间房组5713.16-5803.00m井段进行自生酸复合酸压工艺技术酸压施工。 [0102] TH10270 well 5713.16-5803.00m well Ordovician Yijianfang autogenous pressure acid complex construction techniques acid acid fracturing process. 图4是TH10270井酸压施工曲线图。 FIG 4 is a graph showing construction TH10270 acid fracturing wells. 挤入地层总液量686.5m3 (其中依次加入滑溜水25m3,非交联压裂液356 • 5m3,自生酸27〇m3,胶凝酸3〇m3,滑溜水3〇m3)。 Squeeze the total liquid volume of formation 686.5m3 (wherein 25m3 of water were added slippery, non-crosslinked fracturing fluids 356 • 5m3, self 27〇m3 acid, gelled acid 3〇m3, slickwater 3〇m3). 先采用阶梯提排量的工艺方法注入25m3滑溜水:1 • 2m3/min排量阶段注滑溜水将井筒内高摩阻压井液缓慢挤入地层,降低井口压力,后期逐渐提高排量至1 • 8m3/min来压开地层;接着以5 • 2〜6 • 3m3/min的施工排量注入356 • 5m3非交联压裂液:先根据施工设计中模拟裂缝延伸长度和裂缝高度,逐渐提高排量至5 • 2m3/min观察井口栗压和裂缝延伸情况,在井口泵压要求范围内(井口泵压要求彡79MPa),提高排量至5 • 2m3/min,观察井口泵压为7IMPa,再将排量提高至6 • 3m3/min继续观察,达到井口泵压设计要求(井口栗压设计要求是<79MPa,而排量提高至6 • 3m3/min时的泵压已达到78.5MPa)后稳定该排量用以扩展裂缝延伸。 Process for using first implantation step mentioned displacement 25m3 slickwater: 1 • 2m3 / min displacement stage injection slickwater high friction slow killing fluid squeezed into the formation in the wellbore, wellhead pressure decrease, then gradually increase to a displacement • 8m3 / min pressure to open formation; followed by displacement construction 5 • 2~6 • 3m3 / min injection of 356 • 5m3 non-crosslinked fracturing fluids: the first extended length and fracture height according to the construction design of a simulated fracture, increased gradually displacement to 5 • 2m3 / min to observe fracture propagation pressure and the wellhead Li case, within the wellhead pressure of the pump required range (San wellhead pumping claim 79 MPa), to increase the displacement of 5 • 2m3 / min, to observe the pump pressure wellhead 7IMPa, then the displacement was increased to 6 • 3m3 / min to continue observation, to achieve the design requirements wellhead pressure pump (Li wellhead pressure design requirements <79MPa, while the displacement was increased to 6 • 3m3 / min at pump pressure has reached 78.5MPa) after the stable crack extension extending to the displacement.

[0103]以5.6〜2 • 5m3/min的施工排量注入270m3自生酸对裂缝端部进行刻蚀:酸液刚注入地层后,在井口泵压无明显降低的情形下,就逐渐提高酸液排量至5.6m3/min,增加酸蚀裂缝距离,尽可能沟通到有裂缝、溶洞等处有利储集体,达到建产的目的;在高排量下注入200m3的酸液后,出现井口栗压大幅降低,为了避免酸液在裂缝或溶洞等有利储集体的过量滤失,降低排量至3 • 5m3/min,使得酸液与人工裂缝中岩石反应,提高整个人工裂缝导流能力;到施工后期当酸液剩余液量低于30m3时,为避免高排量下压裂车组吸入空气导致施工停止,故降低酸液排量至2.5m3/min,满足酸液供给要求。 [0103] In operational displacement 5.6~2 • 5m3 / min 270m3 injected autogenous acid etching crack ends: acid immediately after injected into the formation, pumping the wellhead in case of no reduction, increase gradually acid displacement to 5.6m3 / min, increasing the distance etched fracture, the fracture has to communicate, as favorable reservoir cave, etc., to achieve the purpose of producing built; 200m3 after acid injection at a high displacement, the pressure appears wellhead Li greatly reduced, in order to avoid cracks or the like in a cave acid favorable reservoir excessive fluid loss, reduce emissions to 3 • 5m3 / min, such that the rock is reacted with the acid in artificial fractures, fracture conductivity increase overall artificial; to the construction when the remaining amount of the post-acid solution is less than 30m3, in order to avoid high intake air displacement results in fracturing the group to stop construction, so reducing acid emissions to 2.5m3 / min, supplied to meet the requirements of the acid.

[0104]采用阶梯提排量的方式以2 • lm3/min的低排量注入30m3胶凝酸体系,降低人工裂缝内净压力,诱使人工裂缝缓慢闭合,进行闭合酸化提高近井地带导流能力;最后以2.1〜 1.6m3/min的施工排量注入30m3滑溜水:前期以2. lm3/min的排量将井筒内胶凝酸液体系顶入地层,防止酸液腐蚀管柱,并充分利用酸液,让所有的酸液进入储层刻蚀岩石提高近井带导流能力,后期当滑溜水剩余量低于5m3后,将排量降低至1.6m3/min以防止高排量下压裂车组吸入空气导致施工停止。 [0104] The displacement step manner mentioned low displacement 2 • lm3 / min 30m3 injected gelled acid system, reduce the net pressure in the artificial fracture, the fracture slowly induce artificial closure, for closing acidification process flow near wellbore capacity; Finally 2.1~ 1.6m3 / min injected operational displacement 30m3 slickwater: early to emissions 2. lm3 / min into the top of the gelled acid system within the wellbore formation, to prevent acid corrosion of the column, and fully using acid, so that all of the acid into the reservoir rock improve etching with near-wellbore conductivity, slickwater late when the remaining amount is less than 5m3, to reduce the displacement to 1.6m3 / min under high pressure to prevent displacement EMU lead to split of intake air to stop construction.

[0105]施工过程中注自生酸期间套压一直为0,表明有明显沟通储集体显示。 During the [0105] Note the construction process acid autogenous pressure has been set to 0, indicating that significant communication reservoirs display. 停栗测压降后确定合理的关井时间为3h。 Stop chestnut manometry to determine a reasonable time after shut-down 3h.

[0106] 压后初期日产液58 • 2m3/d,不含水。 [0106] After the initial daily fluid pressure 58 • 2m3 / d, free of water. TH10270井设计缝长98 • lm,酸蚀缝长87.2m,压后将现场施工参数输入压裂模型得到实际缝长100 • 9m,酸蚀缝长89.7m;设计平均导流能力89.3md • m,实际平均导流能力141.9md • m。 TH10270 well design of seam length 98 • lm, etching fracture length 87.2m, the pressure will fracture site construction model input parameters to obtain the actual slot length 100 • 9m, etching fracture length 89.7m; average design flow capacity 89.3md • m the actual average flow capacity 141.9md • m. 表明本次酸压后储层深穿透效果较明显,人工裂缝中远端裂缝导流能力得到了提高。 After the acid showed deep penetration effect of the reservoir pressure is obvious, artificial fracture distal fracture conductivity has been improved.

[0107]显然,本领域的技术人员可以对发明进行各种改动和变型而不脱离本发明的精神和范围。 [0107] Obviously, those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. 这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内,则本发明也意图包含这些改动和变型在内。 Thus, if these modifications and variations of the present invention fall within the claims of the invention and the scope of equivalents thereof, the present invention intends to include these modifications and variations.

Claims (9)

  1. 1. 一种用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,包括下述工序: 1) 通过油管向地层中注入滑溜水; 2) 通过油管向地层中注入非交联压裂液,所述非交联压裂液含有质量百分比为0.5% 的非交联改性黄原胶; 3) 通过油管向地层中注入自生酸体系,所述自生酸体系的组成为:50%自生酸A剂+ 50%自生酸B剂,其中所述百分比为体积百分比,所述自生酸A剂是多聚醛类物质中的一种, 所述自生酸B剂是铵盐类物质中的一种; 4) 通过油管向地层中低排量注入胶凝酸体系; 5) 通过油管向地层中注入滑溜水; 其中,工序1)、2)、3)、4)、5)所注入的液体占注入地层总液体的体积比例分别为:工序1)中所述滑溜水占为3〜10%,工序2)中所述非交联压裂液占40〜60 %,工序3)中所述自生酸体系占30〜50%,工序4)中所述胶凝酸体系占3〜10%,工序5)中所述滑溜水的体积比例为3 Acid autogenous pressure acid complex A process for high temperature deep carbonate reservoir, comprising the steps of: a) injecting into the formation through slickwater tubing; 2) injecting a non-crosslinked pressure into the formation through the tubing crack liquid, the non-crosslinked fracturing fluids containing 0.5% by mass percentage of non-crosslinked modified xanthan gum; 3) injecting autogenous acid system through the tubing into the formation, the acid generator from the system consisting of: 50% autogenous acid + 50% a agent B agent from the acid generator, wherein the percentages are percentages by volume, since the agent is an acid generator a polymeric aldehydes in the agent B is autogenous acid ammonium salt substance one kind; 4) injected through the tubing into the formation in low emission gelled acid system; 5) is injected into the formation through the slick water pipe; wherein the step 1), 2), 3), 4), 5) the injected accounting for the total liquid volume of the liquid injected into the formation ratio are: step 1) was accounted for in the slickwater 3~10%, step 2) in the non-crosslinked fracturing fluids accounted 40~60%, step 3) as said accounting system autogenous acid 30 ~ 50%, step 4) in the gelled acid system accounted 3~10%, the volume fraction of step 5) is in the slickwater 3 〜15 %,其中体积单位均为m3; 其中,所述高温深井碳酸盐岩储层是温度在12(TC〜15(TC,深度为4500m〜6500m的储层; 其中,所述工序1)中,所注入的滑溜水组成为:0.2%非交联改性黄原胶+0.5%破乳剂环氧乙烷环氧丙烷共聚物+0.1%杀菌剂甲醛+清水,其中所述百分比为质量百分比; 其中,所述工序2)中,所注入的非交联压裂液组成为:0.5%非交联改性黄原胶+0.5% 助排剂烷基酚聚氧乙烯醚+1.0%破乳剂环氧乙烷环氧丙烷共聚物+0.1 %杀菌剂甲醛+清水,其中所述百分比为质量百分比。 ~ 15%, which are in volume units M3; wherein said elevated temperature is the temperature deep in carbonate reservoir 12 (TC~15 (TC, 4500m~6500m reservoir depth; wherein the step 1) , the injected slickwater composition: 0.2% of non-crosslinked modified xanthan + 0.5% ethylene oxide propylene oxide copolymer demulsifier + formaldehyde + 0.1% biocide water, wherein the percentages are percentages by mass ; wherein the step 2), the injected non-crosslinked fracturing fluid composition was: 0.5% of non-crosslinked modified xanthan + 0.5% drainage aid alkylphenol polyoxyethylene ether + 1.0% demulsifier formaldehyde + water, wherein the percentages are by mass and 0.1% ethylene oxide propylene oxide copolymer fungicides.
  2. 2. 根据权利要求1所述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其特征在于,所述滑溜水的施工排量为0〜3.0m3/min。 The temperature for deep autogenous acid Carbonate Reservoir according to claim 1 Composite acid fracturing process, characterized in that the displacement of slickwater construction 0~3.0m3 / min.
  3. 3. 根据权利要求1或2所述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其特征在于,所述非交联压裂液的施工排量为3 • 0〜6 • 5m3/min。 The self acid complex processes for high temperature deep acid fracturing of carbonate reservoir of claim 1 or claim 2, wherein said non-crosslinked fracturing fluid displacement construction is 3 • 0~ 6 • 5m3 / min.
  4. 4. 根据权利要求1或2所述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其特征在于,所述工序4)中,所注入的胶凝酸体系的组成为:20%HCl+0.8%胶凝剂改性阳离子聚丙烯酰胺+2.0%缓蚀剂碘化钾+1.0%助排剂烷基酚聚氧乙烯醚+1.0%铁离子稳定剂抗坏血酸+1.0%破乳剂环氧乙烷环氧丙烷共聚物,其余为水,其中所述百分比为质量百分比; 胶凝酸体系的施工排量为1.0〜2.5m3/min。 The self acid complex processes for high temperature deep acid fracturing of carbonate reservoir of claim 1 or claim 2, wherein said step 4), the composition of the injected gelled acid system is : 20% HCl + 0.8% gelling agent, modified cationic polyacrylamide + 2.0% + 1.0% KI inhibitor drainage aid alkylphenol polyoxyethylene ether + 1.0% ascorbic acid + ferric ion stabilizer 1.0% demulsifier ring ethylene oxide propylene oxide copolymer, the remainder being water, wherein the percentages are percentages by mass; gelled acid system operational displacement of 1.0~2.5m3 / min.
  5. 5. 根据权利要求1或2所述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其特征在于,所述工序5)中,所注入的滑溜水组成为:0.2%非交联改性黄原胶+〇. 5%破乳剂环氧乙烷环氧丙烷共聚物+0.1%杀菌剂甲醛+清水,其中所述百分比为质量百分比;所述滑溜水的施工排量为1.5〜2.5m3/min。 The self acid complex processes for high temperature deep acid fracturing of carbonate reservoir of claim 1 or claim 2, wherein said step 5), the injected water slipperiness of: 0.2% non-crosslinked modified square xanthan + 5% ethylene oxide propylene oxide copolymer demulsifier + formaldehyde + 0.1% biocide water, wherein the percentages are percentages by mass; construction of the displacement of slickwater 1.5~2.5m3 / min.
  6. 6. 根据权利要求1或2所述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其特征在于,所述工序1)和工序3)可交替多次进行。 The acid used for high temperature deep self carbonate reservoirs or the composite of claim 1 acid fracturing process, characterized in that said step 1) and step 3) may be alternately performed a plurality of times.
  7. 7. 根据权利要求1或2所述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其特征在于,所述工序3)和工序4)之间还包括注入滑溜水的工序,所述滑溜水组成为:〇. 2 %非交联改性黄原胶+0 • 5%破乳剂环氧乙烷环氧丙烷共聚物+0 • 1 %杀菌剂甲醛+清水,其中所述百分比为质量百分比。 The self acid complex processes for high temperature deep acid fracturing of carbonate reservoir of claim 1 or claim 2, characterized in that, between the step 3) and step 4) further comprises a water injection slippery step, the slickwater composition: 2% uncrosslinked square modified xanthan +0 • 5% ethylene oxide propylene oxide copolymer demulsifier +0 • 1% formaldehyde + water biocide, wherein said percentages are percent by mass.
  8. 8. 根据权利要求1或2所述的用于高温深井碳酸盐岩储层的自生酸复合酸压工乙,其特征在于,所述工序3)中,自生酸体系的施工排量为2.5〜7 • Om3/min。 The self temperature acid for deep carbonate reservoirs of claim 1 or claim acid composite working pressure B, wherein said step 3), the operational displacement autogenous acid system is 2.5 ~7 • Om3 / min.
  9. 9. 根据权利要求1或2所述的用于高温深井碳酸盐岩储层的自生酸复合酸压工艺,其特征在于,工序3)和4)之间可以再次注入滑溜水,所述滑溜水组成为:〇.2%非交联改性黄原胶+0.5%破乳剂环氧乙烷环氧丙烷共聚物+0.1%杀菌剂甲醛+清水,其中所述百分比为质量百分比;所述滑溜水的施工排量为2〜3.0m3/min,所注入的滑溜水占注入地层总液体的体积比例为3〜10%。 9. The self acid complex processes for high temperature deep acid fracturing of carbonate reservoir of claim 1 or claim 2, characterized in that water can be injected again between slippery step 3) and 4), the slipperiness of water:% of non-crosslinked 〇.2 modified xanthan + 0.5% ethylene oxide propylene oxide copolymer demulsifier + formaldehyde + 0.1% biocide water, wherein the percentages are percentages by mass; the slipperiness construction of displacement water is 2~3.0m3 / min, accounting for water slipperiness injected volume ratio of the total liquid injection formation is 3~10%.
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