直接返排鉆井完井液儲(chǔ)層保護(hù)機(jī)理分析
發(fā)布時(shí)間：2018-09-12 18:58
【摘要】：水平井裸眼完井是一種最大限度提高儲(chǔ)層開采能力的方式,海上油田常采用無(wú)固相鉆井完井液并輔以破膠完井的方式來(lái)完成鉆完井作業(yè)。直接返排鉆井完井液是在此基礎(chǔ)上開發(fā)的,對(duì)其在參數(shù)設(shè)計(jì)、材料選擇、完井工藝等方面進(jìn)行了分析與評(píng)價(jià),并分析了其儲(chǔ)層保護(hù)機(jī)理。該體系基本組成為海水+純堿/燒堿+流型調(diào)節(jié)劑VIS+淀粉降濾失劑STARFLO+可溶鹽+高純粒徑匹配碳酸鈣MBA,3種功能材料均能夠被0.3%HTA隱形酸螯合劑溶液液化,液化后無(wú)任何殘留,使井筒內(nèi)及近井地帶的泥餅全部轉(zhuǎn)化為清潔鹽水,MBA由5種不同粒徑的碳酸鈣復(fù)配而成,且和淀粉可以達(dá)到互相"鑲嵌"的作用,使泥餅更加致密。通過實(shí)驗(yàn)評(píng)價(jià),該鉆井完井液的低剪切速率黏度控制在30 000 m Pa·s左右,具有最佳防止污染和返排的能力,且滲透率恢復(fù)值最高,可抗15%左右鉆屑污染,滲透率恢復(fù)值大于80%。該體系在南海東部3個(gè)油田、1個(gè)氣田已應(yīng)用12口井,井底最高溫度為60~130℃,密度最高為1.20 g/cm3,3口井屬于低孔滲油藏,9口井屬于中、高孔滲油藏,鉆井過程順利。該技術(shù)簡(jiǎn)化了完井方式,節(jié)省了作業(yè)時(shí)間與費(fèi)用,并具有較好的儲(chǔ)層保護(hù)效果。
[Abstract]:Open-hole completion in horizontal wells is a way to improve reservoir production capacity to the maximum extent. Offshore oil fields often use solid-free drilling and completion fluid with gel breaking completion to complete drilling and completion operations. The drilling and completion fluid for direct backflow drilling and completion is developed on this basis. The parameters design, material selection and completion technology are analyzed and evaluated, and the reservoir protection mechanism is analyzed. The basic composition of the system is that the seawater soda / caustic soda flow pattern regulator VIS starch filter reducer STARFLO soluble salt high purity matching calcium carbonate MBA,3 functional materials can be liquefied by 0.3%HTA invisible acid chelating agent solution without any residual after liquefaction. The mud cake in the well bore and near the well is converted into clean salt water. The MBA is composed of five different sizes of calcium carbonate, and the mud cake is more compact by "inlaying" with starch. The experimental results show that the low shear rate viscosity of the drilling and completion fluid is controlled at about 30 000 m Pa s, which has the best ability to prevent pollution and backflow, and the permeability recovery value is the highest, which can resist about 15% drilling cuttings pollution, and the permeability recovery value is more than 80%. The system has been applied to 12 wells in three oilfields in the east of the South China Sea. The highest bottom temperature is 600.130 鈩，
本文編號(hào)：2239934
[Abstract]:Open-hole completion in horizontal wells is a way to improve reservoir production capacity to the maximum extent. Offshore oil fields often use solid-free drilling and completion fluid with gel breaking completion to complete drilling and completion operations. The drilling and completion fluid for direct backflow drilling and completion is developed on this basis. The parameters design, material selection and completion technology are analyzed and evaluated, and the reservoir protection mechanism is analyzed. The basic composition of the system is that the seawater soda / caustic soda flow pattern regulator VIS starch filter reducer STARFLO soluble salt high purity matching calcium carbonate MBA,3 functional materials can be liquefied by 0.3%HTA invisible acid chelating agent solution without any residual after liquefaction. The mud cake in the well bore and near the well is converted into clean salt water. The MBA is composed of five different sizes of calcium carbonate, and the mud cake is more compact by "inlaying" with starch. The experimental results show that the low shear rate viscosity of the drilling and completion fluid is controlled at about 30 000 m Pa s, which has the best ability to prevent pollution and backflow, and the permeability recovery value is the highest, which can resist about 15% drilling cuttings pollution, and the permeability recovery value is more than 80%. The system has been applied to 12 wells in three oilfields in the east of the South China Sea. The highest bottom temperature is 600.130 鈩，
本文編號(hào)：2239934
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