技术领域technical field
本发明属于油气开采技术领域，具体涉及一种低渗致密气藏改进正序修正等时试井测试方法。The invention belongs to the technical field of oil and gas exploitation, and in particular relates to an improved positive-sequence correction isochronous well testing method for low-permeability tight gas reservoirs.
背景技术Background technique
低渗透气藏在世界分布广泛，资源量大，目前国内外都很重视对该类气田的开发。低渗透气藏储层致密、储量丰度低、非均质性强，实现高效开发难度大。对勘探试采初期的低渗透气藏，在开发资料还不完善的情况下，对其勘探试采测试的工作制度进行研究，可为气藏的勘探发现及合理高效开发提供技术支持。Low-permeability gas reservoirs are widely distributed in the world and have a large amount of resources. At present, domestic and foreign countries attach great importance to the development of this type of gas fields. Low-permeability gas reservoirs have tight reservoirs, low reserve abundance and strong heterogeneity, making it difficult to achieve efficient development. For the low-permeability gas reservoirs in the early stage of exploration and test production, when the development data are not perfect, the research on the working system of the exploration test production test can provide technical support for the exploration discovery and reasonable and efficient development of gas reservoirs.
目前，对低渗透致密气藏勘探井进行试采常采用现有的常规正序修正等时试井测试方法，如图1所示。常规修正等时试井是连续以3-4个稳定产量qgi(i＝1，2，3，4)开井生产相同的时间t(要求进入到径向流动阶段)，而不管流压是否达到稳定。通常是采取产量(气嘴)由小逐步加大的程序。在每个不同气嘴开井生产之间插进的关井压力恢复时间相同，如都关井ts时间，且关井时间与开井时间相同，即ts＝t。每一次关井压力并不要求恢复到地层压力，最后进行延时测试，然后再实施终关井。测量每次生产的稳定产量qgi(i＝1，2，3，4，5)、其末端点的流压pwfi(i＝1，2，3，4一般来说，他们都是不稳定流压)、延时测试的产量qg5和稳定流压pwf，以及每次关井末的关井压力pwsi(i＝1，2，3，4一般来说，它们都是不稳定关井压力)。在双对数坐标纸上用“不稳定产能点”[qgi,(p2wsi-p2wfi)](i＝1,2,3,4)作指数式产能曲线，即(p2R-p2wf)和qg的关系曲线，应得到一条直线，这是“不稳定(指数式)产能曲线”，如图2所示。再过稳定产能点[qg5,(p2R-p2wf)]作不稳定产能曲线的平行线，即为稳定产能曲线，如图2所示。At present, the conventional positive sequence correction isochronous well testing method is often used for production test of exploration wells in low-permeability tight gas reservoirs, as shown in Fig. 1. The conventional corrected isochronous well test is to continuously open the well with 3-4 stable production rates qgi (i=1, 2, 3, 4) and produce for the same time t (required to enter the radial flow stage), regardless of whether the flow pressure is achieve stability. Usually, the output (gas nozzle) is gradually increased from small to small. The shut-in pressure recovery time inserted between the opening and production of each different gas nozzle is the same, for example, the well shut-in time is ts , and the well shut-in time is the same as the well opening time, that is, ts =t. It is not required to return to the formation pressure every time the well is shut in, and a delay test is carried out at the end, and then the final well is shut in. Measure the stable output qgi (i=1, 2, 3, 4, 5) of each production, the flow pressure pwfi of its end point (i=1, 2, 3, 4, generally speaking, they are unstable flow pressure), production qg5 and steady flow pressure pwf of time-delay test, and shut-in pressure pwsi at the end of each well shut-in (i=1, 2, 3, 4, generally speaking, they are unstable shut-in well pressure). Use the "unstable production capacity point" [qgi ,(p2wsi -p2wfi )](i=1,2,3,4) on the double-logarithmic coordinate paper to make an exponential production capacity curve, namely (p2R -p2wf ) and qg curve, should get a straight line, which is "unstable (exponential) capacity curve", as shown in Figure 2. Then pass the stable production capacity point [qg5 ,(p2R -p2wf )] to draw a parallel line to the unstable production capacity curve, which is the stable production capacity curve, as shown in Figure 2.
低渗致密气藏储层致密，非均质性强，具有低渗的特性，现有的正序修正等时试井测试模式不完全适合于低渗致密气藏。低渗透致密气藏非均质性强，有的井物性好、产量高，有的井物性中等、产量中等，有的井物性差、产量低，因此，对具有不同勘探试气产量的井，应分别设计其合理的试采测试工作制度。Low-permeability tight gas reservoirs are dense, highly heterogeneous, and low-permeable. The existing positive-sequence modified isochronous well testing models are not completely suitable for low-permeability tight gas reservoirs. Low-permeability tight gas reservoirs have strong heterogeneity. Some wells have good physical properties and high production, some wells have medium physical properties and medium production, and some wells have poor physical properties and low production. Therefore, for wells with different production in exploration and testing, Reasonable working systems for trial mining and testing should be designed respectively.
对于高产气井(q>5×104m3/d),物性好，储层供气能力强，相当于中高渗气藏，容易测得稳定的工作制度，关井压力容易恢复到原始地层压力。因此，对于此类探井，建议采用现有的常规正序修正等时试井设计。For high-yield gas wells (q>5×104 m3 /d), good physical properties, strong reservoir gas supply capacity, equivalent to medium-high permeability gas reservoirs, easy measurement of stable working conditions, and easy recovery of shut-in pressure to original formation pressure . Therefore, for such exploratory wells, it is recommended to adopt the existing conventional positive sequence modified isochronous well test design.
对于低产气井(q<5×103m3/d)物性差，储层供气能力弱，难以测得稳定的工作制度，甚至较高工作制度下(如8mm和10mm油嘴)可能无法测得有效的气井流量。因此，对于此类探井，难以获得好的产能试井资料，建议仅采用现有的常规1开1关压恢试井设计，且1开用小工作制度生产(如4mm油嘴)，如图3所示。建议使用压恢试井解释结果去估算该井的无阻流量。For low-production gas wells (q<5×103 m3 /d) with poor physical properties and weak reservoir gas supply capacity, it is difficult to measure a stable working regime, and even higher working regimes (such as 8mm and 10mm nozzles) may not be able to measure Effective gas well flow. Therefore, for such exploratory wells, it is difficult to obtain good productivity well test data. It is recommended to only adopt the existing conventional 1-on-1-off pressure recovery well test design, and produce with a small working system (such as 4mm choke) in 1 turn-on, as shown in Fig. 3 shown. It is recommended to use the well interpretation results of the pressure recovery test to estimate the open flow of the well.
对于中产气井(5×103m3/d<q<5×104m3/d)，物性中等，储层供气能力中等，若对低渗透致密气藏勘探井采用现有正序修正等时试井测试模式，不断增大的前4个开井制度使地层能量存在较强的亏空，而低渗气藏井外围天然气供给速度缓慢，致使5开难以获得稳定的生产井底流压，以及5关短时内也难以恢复到原始地层压力，则会导致气井测试效果差，无法进行有效的产能试井和压恢试井解释。因此，针对低渗致密气藏产气井，开展探井试采的合理测试方法研究，无疑具有重要的意义。For medium-production gas wells (5×103 m3 /d<q<5×104 m3 /d), the physical properties are medium, and the gas supply capacity of the reservoir is medium. In the isochronous well test mode, the ever-increasing first four well opening systems lead to a strong shortage of formation energy, and the slow supply of natural gas around the low permeability gas reservoir wells makes it difficult to obtain stable production bottomhole flow pressure at 5 open wells. And it is also difficult to recover to the original formation pressure in a short period of time, which will lead to poor test results of gas wells, and it is impossible to perform effective productivity test and pressure recovery test interpretation. Therefore, it is undoubtedly of great significance to carry out research on reasonable test methods for production wells in low-permeability tight gas reservoirs.
发明内容Contents of the invention
本发明主要是克服现有技术中的不足之处，提出一种低渗透致密气藏勘探试气合理测试方法，本方法易于获取稳定的工作制度，压力恢复不受多开多关工作制度变化的影响，不仅能够获得更好的测试效果以便于试井解释，还节约了稳定工作制度和之后压恢试井的测试时间。The present invention mainly overcomes the deficiencies in the prior art and proposes a reasonable test method for gas exploration and testing of low-permeability tight gas reservoirs. This method is easy to obtain a stable working system, and the pressure recovery is not subject to changes in the multi-opening and multi-closing working system. Not only can better test results be obtained for well test interpretation, but also the test time for stable working system and pressure recovery test wells can be saved.
本发明解决上述技术问题所提供的技术方案是：一种低渗致密气藏改进正序修正等时试井测试方法，包括以下步骤：The technical solution provided by the present invention to solve the above-mentioned technical problems is: an improved positive-sequence correction isochronous well testing method for low-permeability tight gas reservoirs, comprising the following steps:
步骤S10、收集并整理低渗透致密气藏勘探试采目标井的钻完井、测井、取芯的资料，并对资料进行综合分析，获取气藏及气井的基本参数；Step S10, collecting and sorting the drilling and completion, logging and coring data of the target well for exploration and test production of the low-permeability tight gas reservoir, and comprehensively analyzing the data to obtain the basic parameters of the gas reservoir and the gas well;
步骤S20、在目标井井底放置电子压力计；Step S20, placing an electronic pressure gauge at the bottom of the target well;
步骤S30、对目标井采用5开5关的改进正序测试模式进行勘探试采工作，其中逐级放大的开井气嘴尺寸，以获取逐级增加的开井气井试气产量；在改进的正序测试的开井时间和关井时间中，一关关井时间大于一开开井时间，其余关井时间与开井时间相同；Step S30, adopting the improved positive sequence test mode of 5 on and 5 off for the target well to carry out exploration and test production work, in which the size of the open well gas nozzle is enlarged step by step to obtain the step by step increase of the open well gas well test gas production; in the improved Among the well opening time and shut-in time of the positive sequence test, the shut-in and shut-in time is longer than the well opening and opening time, and the remaining shut-in time is the same as the well opening time;
步骤S40、在5开5关的试采测试作业结束后，利用试井分析软件将取出的电子压力计进行读取，绘制气井试采的5开5关工作历史曲线图，进行试井解释，输出解释结果。Step S40, after the 5-on-5-off test production test operation is completed, use the well test analysis software to read the electronic pressure gauge taken out, draw the 5-on 5-off work history curve of the gas well test production, and perform well test interpretation, Output the interpreted results.
进一步的实施方案是，所述步骤S30中的具体步骤为：A further embodiment is that the specific steps in the step S30 are:
步骤S301、在气井井口安放第一节流气嘴d1，按第1次开井时间t1进行第1次开井作业，获得稳定的工作制度以及第一气井井口产气流量q1；Step S301, placing the first throttling nozzle d1 at the wellhead of the gas well, and performing the first well opening operation according to the first well opening time t1 to obtain a stable working system and the gas production flow q1 at the wellhead of the first gas well;
步骤S302、按第1次关井时间t1s进行第1次关井作业，获得该次关井测试的压力数据，关井结束时将节流气嘴更换为第二节流气嘴d2；Step S302, perform the first shut-in operation according to the first shut-in time t1s , obtain the pressure data of the shut-in test, and replace the choke nozzle with the second choke nozzled2 at the end of the well shut-in;
步骤S303、按第2次开井时间t2进行第2次开井作业，用小工作制度进行工作，获得不稳定工作制度点，并获得第二气井井口产气流量q2；Step S303, carry out the second well opening operation according to the second well opening timet2 , work with the small working system, obtain the unstable working system point, and obtain the gas production flow rate q2 at the wellhead of thesecond gas well;
步骤S304、按第2次关井时间t2s进行第2次关井作业，获得该次关井测试的压力数据，关井结束时将节流气嘴更换第三节流气嘴d3；Step S304, perform the second shut-in operation according to the second shut-in time t2s , obtain the pressure data of the shut-in test, and replace the throttle nozzle with the third throttle nozzled3 when the shut-in is completed;
步骤S305、按第3次开井时间t3进行第3次开井作业，增大工作制度进行工作，获得不稳定工作制度点，并获得第三气井井口产气流量q3；Step S305, carry out the third well opening operation according to the third well opening timet3 , increase the working system to work, obtain the unstable working system point, and obtain the third gas well head gas production flow rateq3 ;
步骤S306、按第3次关井时间t3s进行第3次关井作业，获得该次关井测试的压力数据，关井结束时将节流气嘴更换为第四节流气嘴d4；Step S306, perform the third shut-in operation according to the third shut-in timet3s , obtain the pressure data of the shut-in test, and replace the throttle nozzle with the fourth throttle nozzled4 when the shut-in is completed;
步骤S307、按第4次开井时间t4进行第4次开井作业，增大工作制度进行工作，获得不稳定工作制度点，并获得第四气井井口产气流量q4；Step S307, carry out the fourth well opening operation according to thefourth well opening time t4, increase the working system to work, obtain the unstable working system point, and obtain thefourth gas well head gas production flow rate q4;
步骤S308、按第4次关井时间t4s进行第4次关井作业，获得该次关井测试的压力数据，关井结束时将节流气嘴更换为第五节流气嘴d5；Step S308, perform the fourth shut-in operation according to the fourth shut-in timet4s , obtain the pressure data of the shut-in test, and replace the choke nozzle with thefifth choke nozzle d5 at the end of the well shut-in;
步骤S309、按第5次开井时间t5进行第5次开井作业，增大工作制度进行工作，获得不稳定工作制度点，并获得第五气井井口产气流量q5；Step S309, carry out the fifth well opening operation according to thefifth well opening time t5, increase the working system to work, obtain the unstable working system point, and obtain thefifth gas well head gas production flow rate q5;
步骤S310、按第5次关井时间t5s进行第5次关井作业，关井结束后取出电子压力计，利用进行压力恢复试井解释，以获得有效的地层特性参数。Step S310, perform the fifth well shut-in operation according to the fifth well shut-in time t5s , take out the electronic pressure gauge after the well shut-in, and use it to perform pressure recovery test interpretation to obtain effective formation characteristic parameters.
进一步的实施方案是，所述第一节流气嘴d1、第二节流气嘴d2、第三节流气嘴d3、第四节流气嘴d4、第五节流气嘴d5的直径通过目标井的渗透率k确定；A further embodiment is that the diameters of the first throttle nozzle d1 , the second throttle nozzle d2 , the third throttle nozzle d3 , the fourth throttle nozzle d4 , and the fifth throttle nozzle d5 pass Determine the permeability k of the target well;
当渗透率k<0.001mD时，第一节流气嘴d1、第二节流气嘴d2、第三节流气嘴d3、第四节流气嘴d4、第五节流气嘴d5的直径分别取3mm、3mm、5mm、7mm、9mm；When the permeability k<0.001mD, the diameter of the first throttle nozzle d1 , the second throttle nozzle d2 , the third throttle nozzle d3 , the fourth throttle nozzle d4 , and the fifth throttle nozzle d5 Take 3mm, 3mm, 5mm, 7mm, 9mm respectively;
当渗透率0.001<k<0.01mD时，第一节流气嘴d1、第二节流气嘴d2、第三节流气嘴d3、第四节流气嘴d4、第五节流气嘴d5的直径分别取4mm、4mm、6mm、8mm、10mm；When the permeability is 0.001<k<0.01mD, the first throttle nozzle d1 , the second throttle nozzle d2 , the third throttle nozzle d3 , the fourth throttle nozzle d4 , and the fifth throttle nozzle d5 The diameters are respectively 4mm, 4mm, 6mm, 8mm and 10mm;
当渗透率0.01<k<0.1mD时，第一节流气嘴d1、第二节流气嘴d2、第三节流气嘴d3、第四节流气嘴d4、第五节流气嘴d5的直径分别取5mm、5mm、7mm、9mm、11mm；When the permeability is 0.01<k<0.1mD, the first throttle nozzle d1 , the second throttle nozzle d2 , the third throttle nozzle d3 , the fourth throttle nozzle d4 , and the fifth throttle nozzle d5 The diameters are respectively 5mm, 5mm, 7mm, 9mm and 11mm;
当渗透率0.1<k<1mD时，第一节流气嘴d1、第二节流气嘴d2、第三节流气嘴d3、第四节流气嘴d4、第五节流气嘴d5的直径分别取6mm、6mm、8mm、10mm、12mm；When the permeability is 0.1<k<1mD, the first throttle nozzle d1 , the second throttle nozzle d2 , the third throttle nozzle d3 , the fourth throttle nozzle d4 , and the fifth throttle nozzle d5 The diameters are 6mm, 6mm, 8mm, 10mm and 12mm respectively;
当渗透率k>1mD时，第一节流气嘴d1、第二节流气嘴d2、第三节流气嘴d3、第四节流气嘴d4、第五节流气嘴d5的直径分别取7mm、7mm、9mm、11mm、13mm。When the permeability k>1mD, the diameters of the first throttle nozzle d1 , the second throttle nozzle d2 , the third throttle nozzle d3 , the fourth throttle nozzle d4 , and the fifth throttle nozzle d5 are respectively Take 7mm, 7mm, 9mm, 11mm, 13mm.
进一步的实施方案是，所述第1次开井时间t1为1000h，所述第1次关井时间t5s为2000h，所述第5次开井时间t5、第2次开井时间t2、第3次开井时间t3、第4次开井时间t4、第5次关井时间t5s、第2次关井时间t2s、第3次关井时间t3s、第4次关井时间t4s均为24h。A further embodiment is that the first well opening time t1 is 1000h, the first well closing time t5s is 2000h, the fifth well opening time t5 , and the second well opening time t2. Time of the third well opening t3 , time of the fourth well opening t4 , time of the fifth shut-in t5s , time of the second shut-in t2s , time of the third shut-in t3s , time of the fourth Shut-in time t4s is 24h.
本发明的有益效果是：本发明考虑了低渗透致密气藏储量丰度低、非均质性强、低渗的特性，设计了适合其地层情况的合理的勘探试采井测试方法。易于获取稳定的工作制度，压力恢复不受多开多关工作制度变化的影响，不仅能够获得更好的测试效果以便于试井解释，还节约了稳定工作制度和之后压恢试井的测试时间。The beneficial effects of the present invention are: the present invention considers the characteristics of low reserve abundance, strong heterogeneity, and low permeability of low-permeability tight gas reservoirs, and designs a reasonable exploration and test-production well test method suitable for the stratum conditions. It is easy to obtain a stable working system, and the pressure recovery is not affected by the change of the multi-opening and multi-closing working system, not only can obtain better test results for well test interpretation, but also save the testing time of the stable working system and subsequent pressure recovery testing .
附图说明Description of drawings
图1是现有正序修正等时试井测试模式示意图；Fig. 1 is a schematic diagram of the existing positive sequence correction isochronous well testing mode;
图2是现有正序修正等时试井指数式产能曲线图；Fig. 2 is the existing positive-sequence modified isochronous well test exponential productivity curve;
图3是常规的一开一关压恢试井测试模式示意图；Fig. 3 is a schematic diagram of a conventional one-on-one-off pressure recovery test mode;
图4是改进的正序修正等时试井测试设计示意图。Fig. 4 is a schematic diagram of the test design of the improved positive sequence correction isochronous well test.
具体实施方式Detailed ways
下面结合实施例和附图对本发明做更进一步的说明。The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.
本发明的一种低渗致密气藏改进正序修正等时试井测试方法，包括以下步骤：An improved positive-sequence correction isochronous well testing method for low-permeability tight gas reservoirs of the present invention comprises the following steps:
步骤S10、收集并整理低渗透致密气藏勘探试采目标井的钻完井、测井、取芯的资料，并对资料进行综合分析，获取气藏及气井的基本参数；Step S10, collecting and sorting the drilling and completion, logging and coring data of the target well for exploration and test production of the low-permeability tight gas reservoir, and comprehensively analyzing the data to obtain the basic parameters of the gas reservoir and the gas well;
步骤S20、在目标井井底放置电子压力计；Step S20, placing an electronic pressure gauge at the bottom of the target well;
步骤S30、对目标井采用5开5关的改进正序测试模式进行勘探试采工作，其中逐级放大的开井气嘴尺寸，开井气嘴包括第一节流气嘴d1、第二节流气嘴d2、第三节流气嘴d3、第四节流气嘴d4、第五节流气嘴d5(d1＝d2<d3<d4<d5)，以获取逐级增加的开井气井试气产量，其中开井气井试气产量包括第一气井井口产气流量q1、第二气井井口产气流量q2、第三气井井口产气流量q3、第四气井井口产气流量q4、第五气井井口产气流量q5(q1<q2<q3<q4<q5)；在改进的正序测试的开井时间和关井时间中，一关关井时间大于一开开井时间，其余关井时间与开井时间相同；Step S30, use the improved positive sequence test mode of 5 on and 5 off for the target well to carry out exploration and test production work, in which the size of the opening gas nozzle is enlarged step by step, the opening gas nozzle includes the first throttling nozzle d1 , the second section Flow nozzle d2 , third flow nozzle d3 , fourth flow nozzle d4 , fifth flow nozzle d5 (d1 =d2 <d3 <d4 <d5 ), to obtain step-by-step increase gas well test production of the open well, in which the gas test production of the open well gas well includes the first gas well head gas production flow rate q1 , the second gas well head gas production flow rate q2 , the third gas well head gas production flow rate q3 , and the fourth gas well head gas production rate gas production flow q4 , gas production flow q5 at the wellhead of the fifth gas well (q1 <q2 <q3 <q4 <q5 ); The shut-in time is longer than the opening time, and the remaining shut-in time is the same as the opening time;
步骤S301、在气井井口安放第一节流气嘴d1，按第1次开井时间t1进行第1次开井作业，获得稳定的工作制度以及第一气井井口产气流量q1；Step S301, placing the first throttling nozzle d1 at the wellhead of the gas well, and performing the first well opening operation according to the first well opening time t1 to obtain a stable working system and the gas production flow q1 at the wellhead of the first gas well;
步骤S302、按第1次关井时间t1s进行第1次关井作业，获得该次关井测试的压力数据，关井结束时将节流气嘴更换为第二节流气嘴d2；Step S302, perform the first shut-in operation according to the first shut-in time t1s , obtain the pressure data of the shut-in test, and replace the choke nozzle with the second choke nozzled2 at the end of the well shut-in;
步骤S303、按第2次开井时间t2进行第2次开井作业，用小工作制度进行工作，获得不稳定工作制度点，并获得第二气井井口产气流量q2；Step S303, carry out the second well opening operation according to the second well opening timet2 , work with the small working system, obtain the unstable working system point, and obtain the gas production flow rate q2 at the wellhead of thesecond gas well;
步骤S304、按第2次关井时间t2s进行第2次关井作业，获得该次关井测试的压力数据，关井结束时将节流气嘴更换第三节流气嘴d3；Step S304, perform the second shut-in operation according to the second shut-in time t2s , obtain the pressure data of the shut-in test, and replace the throttle nozzle with the third throttle nozzled3 when the shut-in is completed;
步骤S305、按第3次开井时间t3进行第3次开井作业，增大工作制度进行工作，获得不稳定工作制度点，并获得第三气井井口产气流量q3；Step S305, carry out the third well opening operation according to the third well opening timet3 , increase the working system to work, obtain the unstable working system point, and obtain the third gas well head gas production flow rateq3 ;
步骤S306、按第3次关井时间t3s进行第3次关井作业，获得该次关井测试的压力数据，关井结束时将节流气嘴更换为第四节流气嘴d4；Step S306, perform the third shut-in operation according to the third shut-in timet3s , obtain the pressure data of the shut-in test, and replace the throttle nozzle with the fourth throttle nozzled4 when the shut-in is completed;
步骤S307、按第4次开井时间t4进行第4次开井作业，增大工作制度进行工作，获得不稳定工作制度点，并获得第四气井井口产气流量q4；Step S307, carry out the fourth well opening operation according to thefourth well opening time t4, increase the working system to work, obtain the unstable working system point, and obtain thefourth gas well head gas production flow rate q4;
步骤S308、按第4次关井时间t4s进行第4次关井作业，获得该次关井测试的压力数据，关井结束时将节流气嘴更换为第五节流气嘴d5；Step S308, perform the fourth shut-in operation according to the fourth shut-in timet4s , obtain the pressure data of the shut-in test, and replace the choke nozzle with thefifth choke nozzle d5 at the end of the well shut-in;
步骤S309、按第5次开井时间t5进行第5次开井作业，增大工作制度进行工作，获得不稳定工作制度点，并获得第五气井井口产气流量q5；Step S309, carry out the fifth well opening operation according to thefifth well opening time t5, increase the working system to work, obtain the unstable working system point, and obtain thefifth gas well head gas production flow rate q5;
步骤S310、按第5次关井时间t5s进行第5次关井作业，关井结束后取出电子压力计，利用进行压力恢复试井解释，以获得有效的地层特性参数。Step S310, perform the fifth well shut-in operation according to the fifth well shut-in time t5s , take out the electronic pressure gauge after the well shut-in, and use it to perform pressure recovery test interpretation to obtain effective formation characteristic parameters.
步骤S40、在5开5关的试采测试作业结束后，利用试井分析软件将取出的电子压力计进行读取，绘制气井试采的5开5关工作历史曲线图，进行试井解释，输出解释结果。Step S40, after the 5-on-5-off test production test operation is completed, use the well test analysis software to read the electronic pressure gauge taken out, draw the 5-on 5-off work history curve of the gas well test production, and perform well test interpretation, Output the interpreted results.
其中，所述第一节流气嘴d1、第二节流气嘴d2、第三节流气嘴d3、第四节流气嘴d4、第五节流气嘴d5的直径通过目标井的渗透率k确定；Wherein, the diameters of the first throttle nozzle d1 , the second throttle nozzle d2 , the third throttle nozzle d3 , the fourth throttle nozzle d4 , and the fifth throttle nozzle d5 pass through the penetration of the target well. The rate k is determined;
当渗透率k<0.001mD时，第一节流气嘴d1、第二节流气嘴d2、第三节流气嘴d3、第四节流气嘴d4、第五节流气嘴d5的直径分别取3mm、3mm、5mm、7mm、9mm；When the permeability k<0.001mD, the diameter of the first throttle nozzle d1 , the second throttle nozzle d2 , the third throttle nozzle d3 , the fourth throttle nozzle d4 , and the fifth throttle nozzle d5 Take 3mm, 3mm, 5mm, 7mm, 9mm respectively;
当渗透率0.001<k<0.01mD时，第一节流气嘴d1、第二节流气嘴d2、第三节流气嘴d3、第四节流气嘴d4、第五节流气嘴d5的直径分别取4mm、4mm、6mm、8mm、10mm；When the permeability is 0.001<k<0.01mD, the first throttle nozzle d1 , the second throttle nozzle d2 , the third throttle nozzle d3 , the fourth throttle nozzle d4 , and the fifth throttle nozzle d5 The diameters are respectively 4mm, 4mm, 6mm, 8mm and 10mm;
当渗透率0.01<k<0.1mD时，第一节流气嘴d1、第二节流气嘴d2、第三节流气嘴d3、第四节流气嘴d4、第五节流气嘴d5的直径分别取5mm、5mm、7mm、9mm、11mm；When the permeability is 0.01<k<0.1mD, the first throttle nozzle d1 , the second throttle nozzle d2 , the third throttle nozzle d3 , the fourth throttle nozzle d4 , and the fifth throttle nozzle d5 The diameters are respectively 5mm, 5mm, 7mm, 9mm and 11mm;
当渗透率0.1<k<1mD时，第一节流气嘴d1、第二节流气嘴d2、第三节流气嘴d3、第四节流气嘴d4、第五节流气嘴d5的直径分别取6mm、6mm、8mm、10mm、12mm；When the permeability is 0.1<k<1mD, the first throttle nozzle d1 , the second throttle nozzle d2 , the third throttle nozzle d3 , the fourth throttle nozzle d4 , and the fifth throttle nozzle d5 The diameters are 6mm, 6mm, 8mm, 10mm and 12mm respectively;
当渗透率k>1mD时，第一节流气嘴d1、第二节流气嘴d2、第三节流气嘴d3、第四节流气嘴d4、第五节流气嘴d5的直径分别取7mm、7mm、9mm、11mm、13mm。When the permeability k>1mD, the diameters of the first throttle nozzle d1 , the second throttle nozzle d2 , the third throttle nozzle d3 , the fourth throttle nozzle d4 , and the fifth throttle nozzle d5 are respectively Take 7mm, 7mm, 9mm, 11mm, 13mm.
所述第1次开井时间t1为1000h，所述第1次关井时间t5s为2000h，所述第5次开井时间t5、第2次开井时间t2、第3次开井时间t3、第4次开井时间t4、第5次关井时间t5s、第2次关井时间t2s、第3次关井时间t3s、第4次关井时间t4s均为24h。The first well opening timet1 is 1000h, the first well closing timet5s is 2000h, thefifth well opening time t5, the second well opening timet2 , the third well opening time The well time t3 , the fourth well opening time t4 , the fifth well shut-in time t5s , the second well shut-in time t2s , the third well shut-in time t3s , and the fourth well shut-in time t4s for 24h.
常规的正序修正等时试井测试需要很长的测试时间才能使气井达到稳定的工作制度，开井生产的井底流压达到稳定，以及关井恢复的压力达到原始地层压力。本发明考虑了低渗透致密气藏储量丰度低、非均质性强、低渗的特性，设计了适合其地层情况的合理的勘探试采井测试方法,易于获取稳定的工作制度，压力恢复不受多开多关工作制度变化的影响，不仅能够获得更好的测试效果以便于试井解释，还节约了稳定工作制度和之后压恢试井的测试时间,具有潜在的应用推广价值。Conventional positive-sequence correction isochronous well testing requires a long test time to make the gas well reach a stable working system, the bottomhole flow pressure of well opening and production reaches stability, and the recovery pressure of shutting the well reaches the original formation pressure. The present invention considers the characteristics of low reserve abundance, strong heterogeneity, and low permeability of low-permeability tight gas reservoirs, and designs a reasonable exploration test well test method suitable for the formation conditions, which is easy to obtain a stable working system and pressure recovery It is not affected by the change of multi-opening and multi-closing working system, not only can obtain better test results for well test interpretation, but also save the testing time of stable working system and subsequent pressure recovery test, which has potential application and promotion value.
以上所述，并非对本发明作任何形式上的限制，虽然本发明已通过上述实施例揭示，然而并非用以限定本发明，任何熟悉本专业的技术人员，在不脱离本发明技术方案范围内，当可利用上述揭示的技术内容作出些变动或修饰为等同变化的等效实施例，但凡是未脱离本发明技术方案的内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本发明技术方案的范围内。The above description does not limit the present invention in any form. Although the present invention has been disclosed by the above-mentioned embodiments, it is not intended to limit the present invention. When the technical content disclosed above can be used to make some changes or be modified into equivalent embodiments with equivalent changes, but if they do not deviate from the content of the technical solution of the present invention, any simple modifications made to the above embodiments according to the technical essence of the present invention, are equivalent to Changes and modifications all still belong to the scope of the technical solution of the present invention.
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| CN201810578242.7ACN108798648A (en) | 2018-06-07 | 2018-06-07 | A kind of hypotonic tight gas reservoir improvement positive sequence modified isochronal test method |
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