神泉區(qū)塊Esh地層流變特性及井壁穩(wěn)定分析研究
發(fā)布時(shí)間：2018-08-09 07:52
【摘要】：隨著我國(guó)石油工業(yè)的不斷發(fā)展,在鉆井過(guò)程中鉆遇復(fù)雜地層也越來(lái)越多,針對(duì)復(fù)雜地層的特性開展有針對(duì)性的技術(shù)研究,弄清其機(jī)理和相關(guān)規(guī)律,對(duì)制定相應(yīng)工程技術(shù)方案,規(guī)避相關(guān)鉆井風(fēng)險(xiǎn)具有重要意義。流變地層是典型的復(fù)雜地層之一,在我國(guó)的新疆、四川、中原、江漢等油氣田均有較為廣泛的分布�，F(xiàn)場(chǎng)實(shí)踐表明,由于地層沉積的非均質(zhì)性,在鉆遇流變地層時(shí),往往還伴有較為突出的井壁失穩(wěn)問(wèn)題,這就加大了在該類地層的鉆井的難度。因此,在研究地層流變特性的同時(shí),結(jié)合井壁穩(wěn)定性的分析和研究,有利于更為安全地提出解決該類復(fù)雜地層的鉆井難點(diǎn)的對(duì)策,以達(dá)到優(yōu)化完井方案,提高鉆井成功率的目的,這對(duì)于我國(guó)這樣一個(gè)石油消費(fèi)大國(guó)是十分重要的,具有廣闊的應(yīng)用前景。本文以神泉區(qū)塊為主要研究對(duì)象,主要開展了以下分析研究工作：1、共統(tǒng)計(jì)了神泉區(qū)塊14口井的實(shí)鉆資料,分析表明鄯善群(Esh)含有大量鹽膏巖,且易蠕變縮徑,因而在鉆井過(guò)程中易發(fā)生卡鉆等現(xiàn)象。同時(shí)由于鉆井過(guò)程中所采用的鉆井液密度等工程參數(shù)的大小不合適,在沒(méi)有有效抑制蠕變的同時(shí)也造成了井壁失穩(wěn)。2、進(jìn)行了巖石力學(xué)特性研究,收集到神全區(qū)塊鄯善群(Esh)組地層巖芯10塊,按照國(guó)際巖石力學(xué)學(xué)會(huì)標(biāo)準(zhǔn),開展了聲學(xué)參數(shù)和動(dòng)力學(xué)參數(shù)的測(cè)定,并進(jìn)行了單軸抗壓強(qiáng)度,三軸抗壓強(qiáng)度試驗(yàn),建立了巖石力學(xué)參數(shù)計(jì)算模型。利用測(cè)井資料計(jì)算并建立了巖石特征參數(shù)剖面。3、建立了神泉地區(qū)地層孔隙壓力計(jì)算模型,結(jié)合測(cè)井資料,計(jì)算分析了該地區(qū)地層孔隙壓力壓力縱橫向分布規(guī)律。4、針對(duì)神泉區(qū)塊鄯善群組存在的鹽膏層特性進(jìn)行分析,在弄清地應(yīng)力分布規(guī)律的基礎(chǔ)上,建立了鹽膏層流變本構(gòu)方程,利用FLAC3D軟件對(duì)鹽膏層流變特性進(jìn)行了模擬研究,確立了可描述該地區(qū)鹽膏層流變行為特征的模型,計(jì)算并繪制了抑制地層流變應(yīng)力的鉆井液圖譜。5、通過(guò)對(duì)井底圍巖受力情況分析,依據(jù)庫(kù)倫摩爾破壞準(zhǔn)則,建立了地層坍塌破裂壓力計(jì)算模型,通過(guò)結(jié)合測(cè)井資料,計(jì)算并繪制出地層坍塌破裂壓力剖面,分析了維持井壁穩(wěn)定安全鉆井液密度范圍,并結(jié)合所建立的抑制地層流變應(yīng)力的鉆井液圖譜,進(jìn)行了校對(duì)分析,同時(shí)根據(jù)鹽膏層鉆井液應(yīng)具有的膨脹抑制性和飽和度對(duì)巖屑溶解率等方面特點(diǎn)設(shè)計(jì)了相應(yīng)的鉆井液體系。通過(guò)對(duì)神泉區(qū)塊鄯善群組(Esh)地層流變特性及井壁穩(wěn)定分析研究,形成了一套適合神泉地區(qū)鄯善群組(Esh)地層的安全、快速鉆完井工藝技術(shù),滿足了安全生產(chǎn)的需要,減少或避免神泉地區(qū)鉆完井過(guò)程中的復(fù)雜情況發(fā)生,提高了機(jī)械鉆速,縮短鉆井周期,擴(kuò)大勘探成果,滿足勘探開發(fā)的需要。
[Abstract]:With the continuous development of petroleum industry in China, more and more complex formations are drilled in the drilling process. In view of the characteristics of the complex formations, a targeted technical study is carried out to make clear its mechanism and related laws, and to formulate corresponding engineering technical schemes. It is of great significance to avoid the related drilling risk. Rheological stratigraphy is one of the typical complex strata, which is widely distributed in Xinjiang, Sichuan, Zhongyuan, Jianghan and other oil and gas fields in China. The field practice shows that due to the heterogeneity of formation deposition, there is often a relatively prominent wellbore instability problem in drilling rheological formation, which increases the difficulty of drilling in this kind of formation. Therefore, while studying the rheological characteristics of the formation, combined with the analysis and study of the wellbore stability, it is advantageous to put forward more safely the countermeasures to solve the drilling difficulties in this kind of complex formation, so as to optimize the completion scheme. The purpose of improving the success rate of drilling is very important for a large oil consuming country such as China and has a broad application prospect. Taking Shenquan block as the main research object, this paper mainly carried out the following analysis and research work: 1, and counted the actual drilling data of 14 wells in Shenquan block. The analysis shows that the Shanshan group (Esh) contains a lot of salt gypsum rock and is easy to creep and shrink diameter. Therefore, drilling is easy to occur in the drilling process, such as drilling phenomenon. At the same time, because the drilling fluid density and other engineering parameters used in the drilling process are not suitable, it can not effectively restrain the creep and at the same time cause the wellbore instability. 2. The rock mechanical properties are studied. In accordance with the International Institute of Rock Mechanics Standard, the acoustic and dynamic parameters were measured, and uniaxial compressive strength and triaxial compressive strength tests were carried out in 10 cores of the (Esh) formation in Shanshan Group, Shanshan Group, Shenquan block, according to the standards of the International Society of Rock Mechanics. The calculation model of rock mechanics parameters is established. Using logging data to calculate and establish rock characteristic parameter profile. 3, to establish the pore pressure calculation model in Shenquan area, and to combine with logging data. The vertical and horizontal distribution of pore pressure in this area is calculated and analyzed. The characteristics of salt paste in Shanshan group of Shenquan block are analyzed. The rheological constitutive equation of salt paste is established on the basis of clarifying the distribution law of in-situ stress. The rheological characteristics of salt paste layer were simulated by FLAC3D software, and a model was established to describe the rheological behavior of salt paste layer in this area. This paper calculates and draws the drilling fluid map .5which can restrain the formation rheological stress. By analyzing the stress of surrounding rock at bottom hole and according to Coulomore's failure criterion, the calculation model of formation collapse fracture pressure is established, and the well logging data are combined. The pressure profile of formation collapse fracture is calculated and drawn, and the range of drilling fluid density is analyzed to maintain the stability and safety of wellbore, and the proofreading analysis is carried out based on the drilling fluid map established to restrain formation rheological stress. At the same time, the corresponding drilling fluid system was designed according to the characteristics of the expansion inhibition and saturation to the cuttings dissolution rate of the salt gypsum drilling fluid. By analyzing the rheological characteristics and wellbore stability of (Esh) formation in Shanshan group of Shenquan block, a set of safe and rapid drilling and completion technology for (Esh) formation in Shanshan group of Shenquan area has been formed, which meets the needs of safe production. In order to reduce or avoid the complex situation during drilling and completion in Shenquan area, the mechanical drilling speed is increased, the drilling period is shortened, the exploration results are expanded, and the needs of exploration and development are met.
【學(xué)位授予單位】：長(zhǎng)江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE21
本文編號(hào)：2173415
[Abstract]:With the continuous development of petroleum industry in China, more and more complex formations are drilled in the drilling process. In view of the characteristics of the complex formations, a targeted technical study is carried out to make clear its mechanism and related laws, and to formulate corresponding engineering technical schemes. It is of great significance to avoid the related drilling risk. Rheological stratigraphy is one of the typical complex strata, which is widely distributed in Xinjiang, Sichuan, Zhongyuan, Jianghan and other oil and gas fields in China. The field practice shows that due to the heterogeneity of formation deposition, there is often a relatively prominent wellbore instability problem in drilling rheological formation, which increases the difficulty of drilling in this kind of formation. Therefore, while studying the rheological characteristics of the formation, combined with the analysis and study of the wellbore stability, it is advantageous to put forward more safely the countermeasures to solve the drilling difficulties in this kind of complex formation, so as to optimize the completion scheme. The purpose of improving the success rate of drilling is very important for a large oil consuming country such as China and has a broad application prospect. Taking Shenquan block as the main research object, this paper mainly carried out the following analysis and research work: 1, and counted the actual drilling data of 14 wells in Shenquan block. The analysis shows that the Shanshan group (Esh) contains a lot of salt gypsum rock and is easy to creep and shrink diameter. Therefore, drilling is easy to occur in the drilling process, such as drilling phenomenon. At the same time, because the drilling fluid density and other engineering parameters used in the drilling process are not suitable, it can not effectively restrain the creep and at the same time cause the wellbore instability. 2. The rock mechanical properties are studied. In accordance with the International Institute of Rock Mechanics Standard, the acoustic and dynamic parameters were measured, and uniaxial compressive strength and triaxial compressive strength tests were carried out in 10 cores of the (Esh) formation in Shanshan Group, Shanshan Group, Shenquan block, according to the standards of the International Society of Rock Mechanics. The calculation model of rock mechanics parameters is established. Using logging data to calculate and establish rock characteristic parameter profile. 3, to establish the pore pressure calculation model in Shenquan area, and to combine with logging data. The vertical and horizontal distribution of pore pressure in this area is calculated and analyzed. The characteristics of salt paste in Shanshan group of Shenquan block are analyzed. The rheological constitutive equation of salt paste is established on the basis of clarifying the distribution law of in-situ stress. The rheological characteristics of salt paste layer were simulated by FLAC3D software, and a model was established to describe the rheological behavior of salt paste layer in this area. This paper calculates and draws the drilling fluid map .5which can restrain the formation rheological stress. By analyzing the stress of surrounding rock at bottom hole and according to Coulomore's failure criterion, the calculation model of formation collapse fracture pressure is established, and the well logging data are combined. The pressure profile of formation collapse fracture is calculated and drawn, and the range of drilling fluid density is analyzed to maintain the stability and safety of wellbore, and the proofreading analysis is carried out based on the drilling fluid map established to restrain formation rheological stress. At the same time, the corresponding drilling fluid system was designed according to the characteristics of the expansion inhibition and saturation to the cuttings dissolution rate of the salt gypsum drilling fluid. By analyzing the rheological characteristics and wellbore stability of (Esh) formation in Shanshan group of Shenquan block, a set of safe and rapid drilling and completion technology for (Esh) formation in Shanshan group of Shenquan area has been formed, which meets the needs of safe production. In order to reduce or avoid the complex situation during drilling and completion in Shenquan area, the mechanical drilling speed is increased, the drilling period is shortened, the exploration results are expanded, and the needs of exploration and development are met.
【學(xué)位授予單位】：長(zhǎng)江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE21
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