本文選題：高密度 + 無固相壓井液�。� 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：隨著對東海油氣田的勘探開發(fā)不斷向深層和低孔低滲油氣延伸,高溫高壓的問題日益突出,必須研發(fā)一種抗高溫、低損害的高密度無固相測試液和壓井液技術(shù),以達(dá)到針對高溫高壓井的安全、高效測試和壓井的目的。 本文首先對平北二期區(qū)塊構(gòu)造和沉積特征做了簡介,并且通過對儲層特征的分析,包括巖性特征、儲集空間類型、物性特征、孔隙結(jié)構(gòu)特征以及黏土礦物敏感性分析,得出了該區(qū)塊潛在的地層損害因素：其水敏性不強,酸化時發(fā)生酸敏效應(yīng)的可能性也很小,該區(qū)儲集層巖石的非均質(zhì)性都比較嚴(yán)重,空隙結(jié)構(gòu)特征表現(xiàn)為孔喉直徑小,孔喉結(jié)構(gòu)以微孔微喉為主,易遭受微粒(伊利石)分散運移損害,也可能存在因孔隙結(jié)構(gòu)中微觀規(guī)模的氣水分布不均,影響氣水流動,造成水鎖損害和賈敏效應(yīng)。 由于無論無機鹽還是有機鹽在淡水或海水中的溶解度都是一定的,所以普通的無固相測試液和壓井液體系密度一般不會很高,這樣就造成了在高溫高壓井測試液和壓井液的選擇方面面臨極大困難的結(jié)果。解決這一問題的辦法是利用增溶技術(shù)來提高了無機鹽或有機鹽的溶解度,使測試液和壓井液密度滿足所需。然而,一般而言,當(dāng)鹽類在溶解度達(dá)到一定高度后,就會出現(xiàn)不穩(wěn)定的問題。為此采用助溶劑技術(shù)克服了高密度測試液的穩(wěn)定性問題,不僅具備很好的熱穩(wěn)定性,而且在運輸和入井泵入過程中也具備很好的穩(wěn)定性,保證了密度的在各種條件下的一致性。本文簡單地對增溶技術(shù)和助溶劑技術(shù)做了介紹,并做了高溫高壓井目前所用鉆井液的損害評價和東海目前所用無固相壓井液的損害評價實驗,以對壓井液的研發(fā)給予借鑒和指導(dǎo)。最終以WJZ-1無固相加重劑、HZR-1增溶劑、NTA-2鹽重結(jié)晶抑制劑和HCY-1緩蝕劑為基礎(chǔ),成功地研發(fā)了HWJZ無固相壓井液體系,其抗溫能力可達(dá)170℃以上,密度最高達(dá)1.80g/cm3。 在實驗室內(nèi)針對平北二期區(qū)塊的儲層物性巖性特點,通過大量實驗,結(jié)果證明HWJZ無固相壓井液體系能夠抗高溫、無毒性,起到很好的保護儲層作用。 現(xiàn)場施工結(jié)果表明低損害高密度無固相壓井液在高溫條件下,性能穩(wěn)定,保證了壓井作業(yè)的順利進(jìn)行。
[Abstract]:As the exploration and development of oil and gas fields in the East China Sea continue to extend to deep and low porosity and low permeability oil and gas, the problem of high temperature and high pressure is becoming increasingly prominent. In order to achieve the safety of high temperature and high pressure wells, high-efficiency testing and well-killing purposes. In this paper, the structure and sedimentary characteristics of Pingbei II block are introduced, and the reservoir characteristics, including lithology, reservoir space type, physical property, pore structure and clay mineral sensitivity, are analyzed. It is concluded that the potential formation damage factors in this block are: its water sensitivity is not strong, the possibility of acid-sensitive effect in acidizing is also very small, the heterogeneity of reservoir rocks in this area is serious, and the pore structure is characterized by small pore throat diameter. The pore throat structure is dominated by micropore microlarynx, which is vulnerable to the dispersed migration of particles (Illite). It may also be affected by the uneven distribution of gas and water on the micro scale of pore structure, resulting in water lock damage and Jamin effect. Because the solubility of both inorganic and organic salts in fresh water or seawater is certain, the density of ordinary solid-free test fluids and well killing fluids is generally not very high. As a result, it is very difficult to select the well logging fluid and the well killing fluid in high temperature and high pressure wells. The solution to this problem is to improve the solubility of inorganic or organic salts by using solubilization technology, so that the density of test fluid and well kill fluid can meet the needs. However, in general, when the solubility of salts reaches a certain level, instability will occur. In order to overcome the stability problem of the high density test liquid by using the cosolvent technique, it not only has good thermal stability, but also has good stability in the process of transporting and pumping into the well, which ensures the consistency of density under various conditions. In this paper, the solubilization technology and solvent assistant technology are briefly introduced, and the damage assessment of drilling fluid currently used in high temperature and high pressure wells and the damage evaluation experiment of non-solid phase killing fluid used in East China Sea are made. To give reference and guidance to the research and development of well-killing fluid. Finally, based on WJZ-1 solvent-free weighting agent (HZR-1), NTA-2 salt recrystallization inhibitor and HCY-1 inhibitor, a solid free HWJZ well killing fluid system was successfully developed. Its temperature resistance was over 170 鈩，

本文編號：1862980