朱立國(guó)黃波陳維余孫亮廖迪姜夢(mèng)奇馮麗娟.中海油能源發(fā)展股份有限公司工程技術(shù)分公司;.北京華油科隆開發(fā)公司.中國(guó)石油大學(xué)(華東);.華北油田分公司勘探開發(fā)研究院
適于高礦化度地層水地層的穩(wěn)油控水絨囊流體
朱立國(guó)1黃波1陳維余1孫亮1廖迪2姜夢(mèng)奇3馮麗娟4
1.中海油能源發(fā)展股份有限公司工程技術(shù)分公司;2.北京華油科隆開發(fā)公司3.中國(guó)石油大學(xué)(華東);4.華北油田分公司勘探開發(fā)研究院
為驗(yàn)證絨囊流體在含高礦化度地層水地層中穩(wěn)油控水效用,在溫度120 ℃、圍壓15 MPa、回壓1.5 MPa條件下,采用恒流速法測(cè)定絨囊流體封堵前后,含不同礦化度鹽水和煤油的人造砂巖柱塞穩(wěn)定流動(dòng)滲透率和注入壓力變化。實(shí)驗(yàn)結(jié)果表明,0.1 mL/min恒定流速下,絨囊流體封堵前后,含F(xiàn)e2++Ca2++Mg2+礦化度分別為1×104mg/L、10×104mg/L、20×104mg/ L鹽水巖心驅(qū)替壓力由0.46~0.63 MPa升至1.39~2.23 MPa,封堵能力提高205.83%~262.64%;滲透率140.82~193.30 mD降至66.96~109.85 mD,損失率43.15%~52.53%。以煤油模擬地層原油,相同條件下測(cè)定封堵前后效果,驅(qū)替壓力0.48~0.52 MPa升至0.51~0.55 MPa,增幅5.83%~8.08%;滲透率232.05~272.52 mD降至211.09~249.25 mD,損失率2.26%~4.51%。在地層水礦化度8×104mg/L、4×104mg/L的Y井和Z井實(shí)施絨囊流體穩(wěn)油控水,通過提高泵次、深抽等工藝,油井產(chǎn)水量分別降低46.38%、15.99%,產(chǎn)油量提高6 200%、180%。研究和應(yīng)用表明,絨囊流體抗高礦化度堵水體系能夠?qū)崿F(xiàn)穩(wěn)油控水。
堵水;絨囊流體;高礦化度地層水;穩(wěn)油控水;室內(nèi)實(shí)驗(yàn);現(xiàn)場(chǎng)應(yīng)用
封堵高礦化度地層水對(duì)封堵流體抗鹽能力要求較高。常用的聚合物類堵劑通過改變聚合物單體類型[1](黨麗旻等,2002),增加耐鹽基團(tuán)[2](王正良等,2003)抗鹽能力達(dá)到20×104mg/L以上。樹脂類堵劑利用交聯(lián)作用[3](蒲萬芬等,2004)引入功能基團(tuán)[4](朱懷江等,2007)抗鹽能力超過15×104mg/L。其他無機(jī)類堵劑如水泥、硅酸鹽類等提高抗鹽能力通過加強(qiáng)高礦化度下封堵結(jié)構(gòu)強(qiáng)度實(shí)現(xiàn)。以上堵劑雖然提高了堵劑作業(yè)礦化度承受范圍,但固態(tài)或接近固態(tài)封堵結(jié)構(gòu)強(qiáng)度過大,堵水作業(yè)同時(shí)大幅度降低油井產(chǎn)量。高礦化度地層水條件下實(shí)現(xiàn)穩(wěn)油控水作業(yè),是困擾現(xiàn)場(chǎng)作業(yè)人員難點(diǎn)之一。能否實(shí)施滲流通道無損傷堵水,成為熱門話題。海上油田X井地層水礦化度超過4×104mg/L,應(yīng)用絨囊流體修井后,油井產(chǎn)水量下降[5](王珊,2015),張媛(2014)用產(chǎn)油趨勢(shì)法研究絨囊流體具有“穩(wěn)油控水”作用[6],認(rèn)為可以用于堵水。
絨囊流體是由鄭力會(huì)[7](2010)為封堵漏失地層開發(fā)的仿生流體,通過堆積、拉抻、堵塞封堵地層滲流通道[8](鄭力會(huì)等,2016),實(shí)現(xiàn)集合大小封堵材料“模糊封堵”集合尺寸的漏失通道[9]。目前絨囊流體應(yīng)用于常規(guī)油氣井鉆井作業(yè)可有效控制低壓漏失層鉆井流體漏失[10],用于煤層氣鉆井可實(shí)現(xiàn)井壁穩(wěn)定[11],已較為廣泛地應(yīng)用于油井控制儲(chǔ)層傷害[12](李良川等,2011)、致密氣井修井[13](王金鳳等,2015)以及老井提產(chǎn)的酸化轉(zhuǎn)向[14](溫哲豪,2015)、儲(chǔ)層改造的重復(fù)壓裂轉(zhuǎn)向[15](鄭力會(huì)等,2015)。筆者對(duì)絨囊流體封堵高礦化度地層水的適用性進(jìn)行了室內(nèi)研究。
含高礦化度地層水地層環(huán)境中實(shí)現(xiàn)“穩(wěn)油控水”效果,包括有效降低地層水產(chǎn)量和穩(wěn)定地層油相產(chǎn)量。目前尚無室內(nèi)流體穩(wěn)油控水評(píng)價(jià)實(shí)驗(yàn)標(biāo)準(zhǔn),部分研究人員常用穩(wěn)定流速下水相和油相在巖心中滲透率[16](齊志遠(yuǎn)等,2014)及壓力[17](杜忠磊,2014)2個(gè)參數(shù)表征2種介質(zhì)流動(dòng)能力。相同流速下,流體滲透率越低,注入壓力越大,表明地層中流體流動(dòng)能力越低。
1.1實(shí)驗(yàn)原理
Test principles
以含F(xiàn)e2+、Ca2+、Mg2+高礦化度鹽水的人造砂巖柱塞模擬含高礦化度地層水地層,先后穩(wěn)定注入地層水和煤油,模擬地層初始油水賦存狀態(tài)。分別對(duì)比測(cè)定絨囊流體注入前后,巖心柱塞中地層水和煤油穩(wěn)定流動(dòng)滲透率及注入壓力變化,評(píng)價(jià)含高礦化度地層水地層中絨囊流體控水效果。
1.2實(shí)驗(yàn)方法
Methods
(1)配制體系囊核劑(十八碳非離子表面活性劑),囊膜劑(單十八酸丙三醇酯),囊層劑(分子量200萬~500萬聚丙烯酰胺復(fù)配物),絨毛劑(分子量1 000萬聚丙烯酰胺),絨囊流體密度0.85~0.95 g/ cm3,塑性黏度25.8~29.3 mPa·s,表觀黏度37.3~43.6 mPa·s,動(dòng)塑比0.91~1.01 mPa·s/Pa。
(2)利用Fe2+、Ca2+、Mg2+配制礦化度1×104mg/ L、10×104mg/L、20×104mg/L地層水,以直徑25 mm氣測(cè)滲透率5 000 mD人造砂巖柱塞模擬地層,實(shí)驗(yàn)溫度120 ℃、圍壓15 MPa、回壓1.5 MPa。
(3)高礦化度環(huán)境下絨囊流體堵水效果評(píng)價(jià)。先后以地層水和煤油介質(zhì)在0.1 mL/min流速下正向通入柱塞2 h。測(cè)定相同流速下柱塞中地層水滲透率kw以及注入壓力ph。以絨囊流體在0.1 mL/min流速下反向通入柱塞2 h后,再測(cè)定地層水0.1 mL/min流速下滲透率k1以及注入壓力p1。單一礦化度平行實(shí)驗(yàn)2組。
(4)高礦化度環(huán)境下絨囊流體穩(wěn)油效果評(píng)價(jià)。先后以度地層水和煤油介質(zhì)在0.1mL/min流速下正向通入柱塞2 h。測(cè)定相同流速下柱塞中煤油滲透率ko以及注入壓力po。以絨囊流體在0.1 mL/min流速下反向通入柱塞2 h后,再測(cè)定煤油相同流速下滲透率k2以及注入壓力p2。單一礦化度平行實(shí)驗(yàn)2組。
以地層水礦化度1×104mg/L、10×104mg/L、20×104mg/L條件下,相同礦化度下2枚柱塞滲透率及壓力均值表征單一礦化度環(huán)境下絨囊堵水作業(yè)效果,如圖1和圖2??梢钥闯?,地層水礦化度1×104~20×104mg/L環(huán)境下,柱塞原始地層水滲透率140.82~193.30 mD,注入壓力0.46~0.63 MPa。絨囊封堵后降至66.96~109.85 mD,注入壓力1.39~2.23 MPa。
圖1 絨囊封堵前后地層水滲透率Fig.1 Formation water permeability before and after plugging by fuzzy-ball fluid
圖2 絨囊封堵前后地層水注入壓力Fig.2 Formation water injection pressures before and after plugging by fuzzy-ball fluid
3.1絨囊流體堵水效果評(píng)價(jià)
Performance of the fuzzy-ball fluid in water plugging
定義絨囊流體注入前后地層水滲透率損失率η1及注入壓力變化率θ1,按照式(1)和式(2)計(jì)算。式中,η1為滲透率損失率,%;k1為柱塞中地層水滲透率,mD;kw為絨囊流體注入前原始地層水滲透率,mD;θ1為壓力變化率,%;p1為絨囊流體注入后地層水穩(wěn)定注入壓力,MPa;pw為絨囊流體注入前地層水穩(wěn)定注入壓力,MPa。
以相同礦化度下2枚柱塞滲透率及壓力均值表征單一礦化度煤油實(shí)驗(yàn)效果,如圖3和圖4。可以看出,地層水礦化度1×104~ 20×104mg/L環(huán)境下,初始煤油滲透率252.29~257.40 mD,注入壓力0.50~0.52 MPa。絨囊封堵后煤油滲透率230.17~234.28 mD,注入壓力0.53~0.55 MPa。
圖3 絨囊封堵前后煤油滲透率變化Fig.3 Changes in kerosene permeability before and after plugging by fuzzy-ball fluid
圖4 絨囊封堵前后煤油注入壓力變化Fig.4 Changes in kerosene injection pressures before and after plugging by fuzzy-ball fluid
對(duì)比礦化度1×104mg/L、10×104mg/L、20× 104mg/L下絨囊流體封堵地層水滲透率損失率及注入壓力變化率,如圖5。
圖5 絨囊封堵后地層水滲透率及注入壓力變化率Fig.5 Changes in formation water permeability and injection pressure before and after plugging by fuzzy-ball fluid
從圖5可看出,地層水礦化度1×104mg/L、10×104mg/L、20×104mg/L,絨囊流體注入后地層水滲透率損失率為52.53%,50.49%,43.15%,地層水注入壓力變化率為262.64%,216.30%,205.83%。實(shí)驗(yàn)表明礦化度20×104mg/L地層環(huán)境下,絨囊流體有效降低地層水流動(dòng)能力。
3.2絨囊流體穩(wěn)油效果評(píng)價(jià)
Performance of the fuzzy-ball fluid in stabilizing oil production
定義絨囊流體注入前后煤油滲透率損失率η2及注入壓力變化率θ2,按照式(3)和式(4)計(jì)算。式中,η2為煤油滲透率損失率,%;k2為絨囊流體注入后煤油滲透率,mD;ko為絨囊流體注入前煤油滲透率,mD;θ2為壓力變化率,%;p2為絨囊流體注入后煤油穩(wěn)定注入壓力,MPa;po為絨囊流體注入前柱塞中煤油穩(wěn)定注入壓力,MPa。
對(duì)比3種礦化度1×104mg/L、10×104mg/L、20× 104mg/L下絨囊流體注入前后煤油滲透率損失率及注入壓力變化率,如圖6。
圖6 絨囊流體注入后煤油滲透率及注入壓力變化Fig.6 Changes in kerosene permeability and injection pressure before and after plugging by fuzzy-ball fluid
從圖6可以看出,地層水礦化度1×104mg/L、10×104mg/L、20×104mg/L條件下,絨囊流體封堵后煤油滲透率分別下降9.32%、8.77%、8.68%,注入壓力分別上升6.06%、8.08%、5.83%,煤油流動(dòng)能力穩(wěn)定。實(shí)驗(yàn)表明絨囊流體在高達(dá)20×104mg/L礦化度地層中穩(wěn)油能力良好。
陸地油田Y井,地層水礦化度8×104mg/L地層注入105 m3絨囊流體18 d后提高泵次50%,至第42 d,油井產(chǎn)水量由26.71 m3/d降至14.42 m3/d,降幅46.01%;產(chǎn)油量由0.10 m3/d增至6.20 m3/d,增幅61倍,目前產(chǎn)油量穩(wěn)定在4.10 m3/d累計(jì)超過100 d。
陸地油田Z井,地層水礦化度大于4×104mg/L地層注入120 m3絨囊流體60 d后實(shí)施深抽,至71 d產(chǎn)水量由15.71 m3/d降至13.20 m3/d,降幅15.99%;產(chǎn)油量由1.71 m3/d增至4.80 m3/d,增幅180%,目前持續(xù)穩(wěn)產(chǎn)超過40 d。
絨囊流體應(yīng)用2口井堵水作業(yè)中,通過增大泵效、引入深抽工藝,有效降低油井產(chǎn)水量的同時(shí),提高產(chǎn)油量,絨囊流體穩(wěn)油控水效果接近室內(nèi)實(shí)驗(yàn)結(jié)果。現(xiàn)場(chǎng)應(yīng)用表明絨囊流體適用于含高礦化度地層水地層的穩(wěn)油控水。
(1)實(shí)驗(yàn)表明,絨囊流體注入地層后能夠有效降低產(chǎn)水量,穩(wěn)定地層產(chǎn)油量,實(shí)現(xiàn)穩(wěn)油控水效果,為現(xiàn)場(chǎng)高礦化度地層堵水作業(yè)提供可靠手段。
(2)絨囊流體進(jìn)入高含水地層后,能夠顯著增加地層水流動(dòng)阻力,對(duì)油相流動(dòng)阻力改變效果不明顯。建議現(xiàn)場(chǎng)絨囊流體堵水作業(yè)中,注入絨囊流體后利用深抽、增大泵效等手段整體提高地層流體流動(dòng)能量,提高地層產(chǎn)油量。
(3)絨囊流體在含高礦化度地層水地層中穩(wěn)油控水機(jī)理還需要進(jìn)一步研究,但室內(nèi)實(shí)驗(yàn)及現(xiàn)場(chǎng)應(yīng)用均表明,絨囊流體應(yīng)用于高礦化度地層水油井穩(wěn)油控水作業(yè)可行。
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(修改稿收到日期 2016-01-15)
〔編輯 朱 偉〕
Fuzzy-ball fluid for stabilizing oil production and water control in formations with high-salinity water
ZHU Liguo1, HUANG Bo1, CHEN Weiyu1, SUN Liang1, LIAO Di2
1. CNOOC EnerTech-Drilling & Production Co., Tianjin 300452, China; 2. Beijing Huayou KelongDevelopment Corp., Beijing 100028, China;3. China University of Petroleum, Qingdao, Shandong 266580, China;4. Research Institute of Exploration and Development, Huabei Oilfield CO., Renqiu, Hebei 062552, China
To clarify the performance of fuzzy-ball fluid in stabilizing oil production and water control in formations with highsalinity water, the constant flow velocity was used under temperature of 120 ℃, confining pressure of 15 MPa and backpressure of 1.5 MPa to determine changes in permeability and injection pressures of steady flow in man-made sandstone columns with kerosene and salt water of various salinities before and after plugging by fuzzy-ball fluids. Test results show that, under constant flow rate of 0.1 mL/ min, displacement pressures of formation water containing Fe2+, Ca2+and Mg2+with salinity of 1×104mg/L, 10×104mg/L, 20×104mg/L,respectively, increased from 0.46-0.63 MPa to 1.39-2.23 MPa, plugging capabilities increased by 205.83%-262.64%, and permeability decreased from 140.82-193.30 mD to 66.96-109.85 mD with a losing rate of 43.15%-52.53% after plugging by the fuzzy-ball fluid. In addition, kerosene was used to simulate formation oil to determine plugging performances under identical conditions. The results show that displacement pressures increased by 5.83%-8.08%, from 0.48-0.52 MPa to 0.51-0.55 MPa, and permeability decreased from 232.05-272.52 mD to 211.09-249.25 mD with losing rate of 2.26%-4.51%. Fuzzy-ball fluids were applied in Well Y and Well Z with formationwater salinity of 8×104mg/L and 4×104mg/L for stabilizing oil production and water control. By promoting pumping frequency and deeper pumping, water production in these wells decreased by 46.38% and 15.99%, whereas oil production increased by 6 200% and 180% respectively. These research results and application performances suggest that the fuzzy-ball fluids with resistance to high-salinity formation water can be deployed for stabilizing oil production and water control.
water plugging; fuzzy-ball fluid; high-salinity formation water; stabilizing oil production and water control; laboratory test; field application
ZHU Liguo, HUANG Bo, CHEN Weiyu, SUN Liang, LIAO Di, JIANG Mengqi, FENG Lijuan. Fuzzy-ball fluid for stabilizing oil production and water control in formations with high-salinity water[J].Oil Drilling & Production Technology, 2016, 38(2): 216-220.
TE358
A
1000 -7393( 2016 ) 02 -0216-05
10.13639/j.odpt.2016.02.017
國(guó)家科技重大專項(xiàng)“三氣合采鉆完井技術(shù)與儲(chǔ)層保護(hù)”(編號(hào):2016ZX05066002-001)。
朱立國(guó)(1981-),2007年畢業(yè)于西北大學(xué)應(yīng)用微生物專業(yè),現(xiàn)從事調(diào)剖堵水及三次采油研究工作。通訊地址:(300452)天津市濱海新區(qū)港城大道農(nóng)工新村中海油能源發(fā)展股份有限公司工程技術(shù)分公司121室。電話022-66907731。E-mail:zhulg@ cnooc.com.cn
引用格式:朱立國(guó),黃波,陳維余,孫亮,廖迪,姜夢(mèng)奇,馮麗娟.適于高礦化度地層水地層的穩(wěn)油控水絨囊流體[J].石油鉆采工藝,2016,38(2):216-220.