CN111946331B - A method for testing bottom hole flow pressure and a method for obtaining viscous resistance - Google Patents
A method for testing bottom hole flow pressure and a method for obtaining viscous resistance Download PDFInfo
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Abstract
Description
技术领域Technical Field
本发明涉及煤层气开采技术领域，特别涉及一种井底流压的测试方法及获取粘滞阻力的方法。The invention relates to the technical field of coalbed methane mining, and in particular to a method for testing bottom hole flow pressure and a method for obtaining viscous resistance.
背景技术Background technique
在传统的资料中，将Ff定义为摩擦阻力，在一般计算时忽略，在详细计算时，摩擦载荷包括抽油杆与油管的摩擦力、柱塞与泵筒之间的摩擦力、液柱与抽油杆之间的摩擦力以及液柱与油管之间的摩擦力，其中，柱塞与泵筒之间的摩擦力是摩擦载荷的主要载荷。In traditional data, Ff is defined as friction resistance, which is ignored in general calculations. In detailed calculations, the friction load includes the friction between the sucker rod and the tubing, the friction between the plunger and the pump barrel, the friction between the liquid column and the sucker rod, and the friction between the liquid column and the tubing. Among them, the friction between the plunger and the pump barrel is the main load of the friction load.
上述传统的分析方法，有如下问题：The above traditional analysis methods have the following problems:
由于抽油杆相对于油管垂直布置且柱塞相对于泵筒垂直布置，按照摩擦阻力的定义，抽油杆与油管之间的摩擦力、以及柱塞与泵筒之间的摩擦力应该是正压力与摩擦系数的乘机，而垂直布置导致正压力无法计算；Since the sucker rod is arranged vertically relative to the tubing and the plunger is arranged vertically relative to the pump barrel, according to the definition of friction resistance, the friction between the sucker rod and the tubing, and the friction between the plunger and the pump barrel should be the product of the positive pressure and the friction coefficient. However, the vertical arrangement makes it impossible to calculate the positive pressure.
再加上抽油杆与油管之间、柱塞与泵筒之间存在工作介质，由于工作介质的属性、抽油杆与油管之间的间隙以及柱塞的直径不同，摩擦系数的计算或者获取都很困难。In addition, there is working medium between the sucker rod and the oil pipe, and between the plunger and the pump barrel. Due to the different properties of the working medium, the gap between the sucker rod and the oil pipe, and the diameter of the plunger, it is difficult to calculate or obtain the friction coefficient.
上述两个问题导致摩擦力的获得存在理论和实践上的困难。The above two problems lead to theoretical and practical difficulties in obtaining friction force.
分析柱塞泵与泵筒的结构，煤层气井有杆排水采气装置的柱塞与泵筒、抽油杆与工作介质、工作介质与油管之间，两两存在相对运动，产生阻力，为粘滞阻力，需要获得该粘滞阻力以计算井底流压。Analyze the structure of the plunger pump and the pump barrel. There is relative movement between the plunger and the pump barrel, the sucker rod and the working medium, and the working medium and the oil pipe of the rod drainage and gas production device in the coalbed methane well, which produces resistance, which is viscous resistance. It is necessary to obtain this viscous resistance to calculate the bottom hole flow pressure.
目前，井底流压测试通常采用两种方法，第一种是通过井下压力计进行测量，具体为，井下压力计随油管一起下入井下，井下压力计的使用会增加作业费用，而且压力计存在零飘，需要标定，影响了井下压力计的测试精度，井下压力计的使用寿命短，更换压力计不仅增加成本，严重时会造成储层污染；第二种是通过回声仪测量动液面，获得井底流压，该方法间断测量方法，而且在煤层气井产气时，其测量将不能进行。At present, two methods are usually used to test the bottom hole flow pressure. The first is to measure by a downhole pressure gauge. Specifically, the downhole pressure gauge is lowered into the well together with the oil pipe. The use of the downhole pressure gauge will increase the operating cost, and the pressure gauge has zero drift and needs to be calibrated, which affects the test accuracy of the downhole pressure gauge. The service life of the downhole pressure gauge is short. Replacing the pressure gauge not only increases the cost, but also causes reservoir pollution in serious cases. The second is to measure the dynamic liquid level through an echo sounder to obtain the bottom hole flow pressure. This method is an intermittent measurement method, and its measurement cannot be carried out when the coalbed methane well is producing gas.
因此，如何实现连续、稳定、安全且低成本的井底流压的测试，成为本领域技术人员亟待解决的技术问题。Therefore, how to achieve continuous, stable, safe and low-cost testing of bottom hole flow pressure has become a technical problem that needs to be solved urgently by technical personnel in this field.
发明内容Summary of the invention
有鉴于此，本发明提供了一种获取粘滞阻力的方法，以获取粘滞阻力。本发明还提供了一种井底流压的测试方法，以实现连续、稳定、安全且低成本的井底流压的测试。In view of this, the present invention provides a method for obtaining viscous resistance, so as to obtain viscous resistance. The present invention also provides a method for testing bottom hole flow pressure, so as to achieve continuous, stable, safe and low-cost testing of bottom hole flow pressure.
为实现上述目的，本发明提供如下技术方案：To achieve the above object, the present invention provides the following technical solutions:
一种获取粘滞阻力的方法，包括步骤：A method for obtaining viscous resistance comprises the steps of:
1)从第一悬点示功图上测取上冲程载荷F1和下冲程载荷F2；1) Measure the upstroke load F1 and downstroke load F2 from the first suspension point dynamometer diagram;
2)根据所述上冲程载荷F1和所述下冲程载荷F2计算得到柱塞泵与泵筒之间的粘滞阻力Ff。2) The viscous resistance F f between the plunger pump and the pump barrel is calculated based on the upstroke load F 1 and the downstroke load F 2 .
优选的，在上述粘滞阻力的计算方法中，所述步骤2)中将所述上冲程载荷F1和所述下冲程载荷F2带入公式得到Ff。Preferably, in the above-mentioned method for calculating the viscous resistance, in step 2), the upstroke load F1 and the downstroke load F2 are substituted into the formula Get F f .
一种井底流压的测试方法，包括步骤：A method for testing bottom hole flow pressure comprises the following steps:
11)获取粘滞阻力Ff，所述获取粘滞阻力的方法为权利要求1-2中任意一项所述的获取粘滞阻力的方法；11) Obtaining viscous resistance F f , wherein the method for obtaining viscous resistance is the method for obtaining viscous resistance according to any one of claims 1 to 2;
12)根据第二悬点示功图求出悬点静载荷Fp；12) Determine the static load Fp of the suspension point according to the second suspension point indicator diagram;
13)根据排采井的井身结构参数，获得泵上液柱载荷Fy、井口回压产生的载荷Fh、抽油杆柱与液柱的惯性载荷Fu和抽油杆柱的重量Qg；13) According to the wellbore structural parameters of the drainage well, obtain the liquid column load F y on the pump, the load F h generated by the wellhead back pressure, the inertial load F u of the sucker rod string and the liquid column, and the weight Q g of the sucker rod string;
14)根据所述粘滞阻力Ff、所述悬点静载荷Fp、所述泵上液柱载荷Fy、所述井口回压产生的载荷Fh、所述抽油杆柱与液柱的惯性载荷Fu和所述抽油杆柱的重量Qg，计算得到井底流压Pf。14) The bottom hole flow pressure P f is calculated based on the viscous resistance F f , the static load F p of the suspension point, the liquid column load F y on the pump, the load F h generated by the wellhead back pressure, the inertial load F u of the sucker rod string and the liquid column, and the weight Q g of the sucker rod string .
优选的，在上述井底流压的测试方法中，还包括步骤15)：Preferably, in the above-mentioned bottom hole flow pressure testing method, step 15) is also included:
对所述抽油杆柱进行受力分析，得到Fr＝Fy+Fh+Fu+Ff-Fi，The force analysis of the sucker rod string is carried out to obtain F r =F y +F h +F u +F f -Fi ,
其中，Fi＝Pfs，Where, Fi = P f s,
Fr为抽油杆柱的受力，Fi为泵阀处的井底流压作用在柱塞上的力，s为柱塞面积。F r is the force on the sucker rod string, Fi is the force on the plunger due to the bottom hole flow pressure at the pump valve, and s is the plunger area.
优选的，在上述井底流压的测试方法中，所述步骤14)中计算所述井底流压的公式为 Preferably, in the above-mentioned bottom hole flow pressure testing method, the formula for calculating the bottom hole flow pressure in step 14) is:
从上述技术方案可以看出，本发明提供的获取粘滞阻力的方法，通过自第一悬点示功图上测取上冲程载荷F1和下冲程载荷F2，并通过测取的上冲程载荷F1和下冲程载荷F2进行计算，能够得到柱塞泵与泵筒之间的粘滞阻力Ff，实际上该粘滞阻力即为通常资料上所说的摩擦载荷，使得柱塞与泵筒之间的摩擦载荷在理论和实践上均能获得实现，使用邻井第一悬点示功图的分析，导出粘滞阻力的计算方法，显著的提升了粘滞阻力的计算精度，满足后期井底流压的辅助计算。It can be seen from the above technical scheme that the method for obtaining viscous resistance provided by the present invention can obtain the viscous resistance Ff between the plunger pump and the pump barrel by measuring the upstroke load F1 and the downstroke load F2 from the first suspension point indicator diagram, and calculating through the measured upstroke load F1 and the downstroke load F2 . In fact, the viscous resistance is what is usually referred to as the friction load in the data, so that the friction load between the plunger and the pump barrel can be realized both in theory and in practice. By using the analysis of the first suspension point indicator diagram of the adjacent well, the calculation method of the viscous resistance is derived, which significantly improves the calculation accuracy of the viscous resistance and meets the auxiliary calculation of the bottom hole flow pressure in the later stage.
本方案公开的井底流压的测试方法，利用悬点示功图计算井底流压，能够实现连续、稳定、安全、低成本的井底流压测试。本方案公开的计算井底流压的精度，不仅取决于悬点示功图的测量精度，而且取决于杆柱力学分析、以及柱塞与泵筒之间的粘滞阻力。目前悬点示功图的测量精度和杆柱力学分析已经逐渐成熟，能够保证悬点示功图的测量精度和杆柱力学分析的可靠性，而且上面的技术方案已经公开了粘滞阻力的计算方法，解决了粘滞阻力计算不确定的问题，将悬点示功图测量、杆柱力学分析与粘滞阻力计算相结合，能够得到井底流压，且井底流压的计算精度显著提高，满足煤层气排采对井底流压的测量要求。The bottom hole flow pressure test method disclosed in the present scheme uses the hanging point indicator diagram to calculate the bottom hole flow pressure, which can realize continuous, stable, safe and low-cost bottom hole flow pressure test. The accuracy of the bottom hole flow pressure calculation disclosed in the present scheme depends not only on the measurement accuracy of the hanging point indicator diagram, but also on the rod column mechanical analysis and the viscous resistance between the plunger and the pump barrel. At present, the measurement accuracy of the hanging point indicator diagram and the rod column mechanical analysis have gradually matured, which can ensure the measurement accuracy of the hanging point indicator diagram and the reliability of the rod column mechanical analysis. In addition, the above technical scheme has disclosed a method for calculating the viscous resistance, which solves the problem of uncertainty in the calculation of the viscous resistance. The bottom hole flow pressure can be obtained by combining the hanging point indicator diagram measurement, the rod column mechanical analysis and the viscous resistance calculation. The calculation accuracy of the bottom hole flow pressure is significantly improved, which meets the measurement requirements of the bottom hole flow pressure for coalbed methane drainage.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
图1为本发明实施例提供的获取粘滞阻力的方法的流程图；FIG1 is a flow chart of a method for obtaining viscous resistance provided by an embodiment of the present invention;
图2为本发明实施例提供的井底流压的测试方法的流程图；FIG2 is a flow chart of a method for testing bottom hole flow pressure provided by an embodiment of the present invention;
图3为本发明实施例提供的第一悬点示功图；FIG3 is a first suspension point dynamometer diagram provided by an embodiment of the present invention;
图4为本发明实施例提供的抽油杆的受力分析图。FIG. 4 is a force analysis diagram of a sucker rod provided in an embodiment of the present invention.
具体实施方式Detailed ways
本发明公开了一种获取粘滞阻力的方法，以获取粘滞阻力。本发明还公开了一种井底流压的测试方法，以实现连续、稳定、安全且低成本的井底流压的测试。The invention discloses a method for obtaining viscous resistance, so as to obtain viscous resistance. The invention also discloses a method for testing bottom hole flow pressure, so as to achieve continuous, stable, safe and low-cost testing of bottom hole flow pressure.
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
请参阅图1-图4。本发明公开了一种获取粘滞阻力的方法，如图1所示，包括如下步骤：Please refer to Figures 1 to 4. The present invention discloses a method for obtaining viscous resistance, as shown in Figure 1, comprising the following steps:
1)从第一悬点示功图上测取上冲程载荷F1和下冲程载荷F2，具体为，通过悬点示功仪测取；1) measuring the upstroke load F1 and the downstroke load F2 from the first suspension point dynamometer diagram, specifically, by using a suspension point dynamometer;
2)根据上冲程载荷F1和下冲程载荷F2计算得到柱塞泵与泵筒之间的粘滞阻力Ff。2) The viscous resistance F f between the plunger pump and the pump barrel is calculated based on the upstroke load F 1 and the downstroke load F 2 .
柱塞与泵筒之间存在间隙，该间隙中充满了工作介质，由于柱塞与泵筒之间存在相对运动，产生了阻碍柱塞在泵筒内运动的阻力，该阻力即为粘滞阻力Ff。本方案重新定义了粘滞阻力并提出如下计算方法：There is a gap between the plunger and the pump barrel, which is filled with working medium. Due to the relative movement between the plunger and the pump barrel, resistance is generated to hinder the movement of the plunger in the pump barrel. This resistance is the viscous resistance F f . This scheme redefines the viscous resistance and proposes the following calculation method:
本方案中定义粘滞阻力为煤层气井有杆排水采气装置的柱塞与泵筒之间、抽油杆与工作介质之间、以及工作介质与油管之间两两相对运动产生的阻力；In this scheme, the viscous resistance is defined as the resistance generated by the relative movement between the plunger and the pump barrel, between the sucker rod and the working medium, and between the working medium and the oil pipe of the rod drainage gas extraction device in the coalbed methane well;
粘滞阻力与上述两两相对运动的速度(抽油机的悬点速度)、工作介质的属性、抽油杆与油管之间的间隙、柱塞的直径等有关，由于抽油杆与工作介质、工作介质与油管之间的相对运动速度低、间隙大，因此在一般计算时，可以忽略。The viscous resistance is related to the speed of the above-mentioned relative motion between the two (the suspension point speed of the pumping unit), the properties of the working medium, the gap between the sucker rod and the oil pipe, the diameter of the plunger, etc. Since the relative motion speed between the sucker rod and the working medium, and the working medium and the oil pipe is low and the gap is large, it can be ignored in general calculations.
由于煤层气井有杆排水采气井在稳产期其液面在产出层以下，因此，多数井的悬点示功图为缺液示功图，其动液面在泵阀附近，如图3所示，根据泵充满的程度和泵阀开启的阻力数据，可以求出井底流压。Since the liquid level of rod drainage gas production wells in coalbed methane wells is below the production layer during the stable production period, the hanging point performance diagram of most wells is a liquid-deficient performance diagram, and its dynamic liquid level is near the pump valve, as shown in Figure 3. The bottom hole flow pressure can be calculated based on the degree of pump filling and the resistance data of the pump valve opening.
由于粘滞阻力是抽油杆与油管之间的间隙、工作介质的属性和运动速度的函数，特别是抽油杆与油管之间的间隙和工作介质的属性的函数，对于同一区块的井，其工作介质的属性相同，对于同一泵径的泵，其间隙也一致，因此，用该方法计算的粘滞阻力，可以用于同一区块、同一泵径的有杆泵粘滞阻力的计算。Since the viscous resistance is a function of the gap between the sucker rod and the tubing, the properties of the working medium and the movement speed, especially the gap between the sucker rod and the tubing and the properties of the working medium, for wells in the same block, the properties of the working medium are the same, and for pumps of the same pump diameter, the gaps are also consistent. Therefore, the viscous resistance calculated by this method can be used to calculate the viscous resistance of sucker rod pumps in the same block and with the same pump diameter.
本方案公开的获取粘滞阻力的方法，通过自第一悬点示功图上测取上冲程载荷F1和下冲程载荷F2，并通过测取的上冲程载荷F1和下冲程载荷F2进行计算，能够得到柱塞泵与泵筒之间的粘滞阻力Ff，实际上该粘滞阻力即为通常资料上所说的摩擦载荷，使得柱塞与泵筒之间的摩擦载荷在理论和实践上均能获得实现，使用邻井第一悬点示功图的分析，导出粘滞阻力的计算方法，显著的提升了粘滞阻力的计算精度，满足后期井底流压的辅助计算。The method for obtaining viscous resistance disclosed in the present scheme measures the upstroke load F1 and the downstroke load F2 from the first suspension point dynamometer diagram, and calculates the viscous resistance Ff between the plunger pump and the pump barrel by measuring the upstroke load F1 and the downstroke load F2 measured. In fact, the viscous resistance is what is usually referred to as the friction load in the data, so that the friction load between the plunger and the pump barrel can be realized both in theory and in practice. The calculation method of the viscous resistance is derived by analyzing the first suspension point dynamometer diagram of the adjacent well, which significantly improves the calculation accuracy of the viscous resistance and satisfies the auxiliary calculation of the bottom hole flow pressure in the later stage.
具体的，上冲程载荷F1＝抽油杆的重量+液柱重量+柱塞与泵筒之间的粘滞阻力，下冲程载荷F2＝抽油杆的重量+液柱重量-柱塞与泵筒之间的粘滞阻力，从第一悬点示功图上测取F1和F2，计算柱塞泵与泵筒之间的粘滞阻力。Specifically, the upstroke load F1 = the weight of the sucker rod + the weight of the liquid column + the viscous resistance between the plunger and the pump barrel, and the downstroke load F2 = the weight of the sucker rod + the weight of the liquid column - the viscous resistance between the plunger and the pump barrel. F1 and F2 are measured from the first suspension point dynamometer diagram to calculate the viscous resistance between the plunger pump and the pump barrel.
粘滞阻力Ff的计算公式为具体的，将从第一悬点示功图上测取F1和F2代入公式/>得到Ff。The calculation formula of viscous resistance Ff is: Specifically, F1 and F2 measured from the first suspension point dynamometer diagram are substituted into the formula/> Get F f .
由于目前集中在直接测量井底流压和动液面的方法上，尚没有通过间接测量，获得井底流压的研究报告，本方案公开的井底流压的测试方法打破了上述局限，实现了通过间接测量获得井底流压的目的。Since the current focus is on methods for directly measuring bottom hole flow pressure and dynamic liquid level, there is no research report on obtaining bottom hole flow pressure through indirect measurement. The bottom hole flow pressure testing method disclosed in this scheme breaks the above limitations and achieves the purpose of obtaining bottom hole flow pressure through indirect measurement.
本方案还公开了一种井底流压的测试方法，如图2所示，包括如下步骤：The present invention also discloses a method for testing bottom hole flow pressure, as shown in FIG2 , comprising the following steps:
11)获取粘滞阻力Ff，获取粘滞阻力的方法为上述任意一个方案中记载的获取粘滞阻力的方法；11) Obtaining the viscous resistance F f , wherein the method for obtaining the viscous resistance is the method for obtaining the viscous resistance recorded in any one of the above schemes;
12)根据第二悬点示功图求出悬点静载荷Fp；12) Determine the static load Fp of the suspension point according to the second suspension point indicator diagram;
13)根据排采井的井身结构参数，获得泵上液柱载荷Fy、井口回压产生的载荷Fh、抽油杆柱与液柱的惯性载荷Fu和抽油杆柱的重量Qg；13) According to the wellbore structural parameters of the drainage well, obtain the liquid column load F y on the pump, the load F h generated by the wellhead back pressure, the inertial load F u of the sucker rod string and the liquid column, and the weight Q g of the sucker rod string;
14)根据粘滞阻力Ff、悬点静载荷Fp、泵上液柱载荷Fy、井口回压产生的载荷Fh、抽油杆柱与液柱的惯性载荷Fu和抽油杆柱的重量Qg，计算得到井底流压Pf。14) The bottom hole flow pressure Pf is calculated based on the viscous resistance Ff , the static load Fp of the suspension point, the liquid column load Fy on the pump , the load Fh generated by the wellhead back pressure, the inertial load Fu of the sucker rod string and the liquid column, and the weight Qg of the sucker rod string.
悬点静载荷Fp与抽油杆柱的受力Fr和Qg的函数关系为Fp＝Fr+Qg。The functional relationship between the static load F p at the suspension point and the forces F r and Q g on the sucker rod string is F p = F r + Q g .
具体的，还包括步骤15)，对抽油杆进行力学分析，如图4所示，得到Fr＝Fy+Fh+Fu+Ff-Fi的受力公式，Specifically, the method further includes step 15), in which mechanical analysis is performed on the sucker rod, as shown in FIG4 , to obtain the force formula of F r =F y +F h +F u +F f -Fi .
其中，Fi＝Pfs，Where, Fi = P f s,
Fr为抽油杆柱的受力，Fi为泵阀处的井底流压作用在柱塞上的力，s为柱塞面积。F r is the force on the sucker rod string, Fi is the force on the plunger due to the bottom hole flow pressure at the pump valve, and s is the plunger area.
最终得到井底流压的计算公式为 The final calculation formula for the bottom hole pressure is:
本方案公开的井底流压的测试方法，利用悬点示功图计算井底流压，能够实现连续、稳定、安全、低成本的井底流压测试。本方案公开的计算井底流压的精度，不仅取决于悬点示功图的测量精度，而且取决于杆柱力学分析、以及柱塞与泵筒之间的粘滞阻力。目前悬点示功图的测量精度和杆柱力学分析已经逐渐成熟，能够保证悬点示功图的测量精度和杆柱力学分析的可靠性，而且上面的技术方案已经公开了粘滞阻力的计算方法，解决了粘滞阻力计算不确定的问题，将悬点示功图测量、杆柱力学分析与粘滞阻力计算相结合，能够得到井底流压，且井底流压的计算精度显著提高，满足煤层气排采对井底流压的测量要求。The bottom hole flow pressure test method disclosed in the present scheme uses the hanging point indicator diagram to calculate the bottom hole flow pressure, which can realize continuous, stable, safe and low-cost bottom hole flow pressure test. The accuracy of the bottom hole flow pressure calculation disclosed in the present scheme depends not only on the measurement accuracy of the hanging point indicator diagram, but also on the rod column mechanical analysis and the viscous resistance between the plunger and the pump barrel. At present, the measurement accuracy of the hanging point indicator diagram and the rod column mechanical analysis have gradually matured, which can ensure the measurement accuracy of the hanging point indicator diagram and the reliability of the rod column mechanical analysis. In addition, the above technical scheme has disclosed a method for calculating the viscous resistance, which solves the problem of uncertainty in the calculation of the viscous resistance. The bottom hole flow pressure can be obtained by combining the hanging point indicator diagram measurement, the rod column mechanical analysis and the viscous resistance calculation. The calculation accuracy of the bottom hole flow pressure is significantly improved, which meets the measurement requirements of the bottom hole flow pressure for coalbed methane drainage.
步骤12)中所用的第二悬点示功图与步骤1)所用的第一悬点示功图可以是同一悬点示功图，也可以是不同的悬点示功图，由煤层气井是否缺液的井况决定。The second hanging point indicator diagram used in step 12) and the first hanging point indicator diagram used in step 1) can be the same hanging point indicator diagram or different hanging point indicator diagrams, depending on whether the coalbed methane well is short of liquid.
本方案建立了一种通过测试有杆泵的悬点示功图获得有杆泵排采的煤层气井的井底流压的方法。为了提高井底流压的计算精度，需要计算泵与泵筒的之间的粘滞阻力，并结合煤层气井的工作特点，给出了粘滞阻力的计算方法，这对于建立利用悬点示功图获得井底流压提供了理论基础，利用计算出的粘滞阻力计算井底流压，提高了井底流压的计算精度。使用该理论计算的井底流压，达到工程使用的精度。This scheme establishes a method for obtaining the bottom hole flow pressure of a coalbed methane well produced by a rod pump by testing the suspension point indicator diagram of the rod pump. In order to improve the calculation accuracy of the bottom hole flow pressure, it is necessary to calculate the viscous resistance between the pump and the pump barrel, and combined with the working characteristics of the coalbed methane well, a calculation method for the viscous resistance is given, which provides a theoretical basis for establishing the bottom hole flow pressure obtained by using the suspension point indicator diagram. The bottom hole flow pressure is calculated using the calculated viscous resistance, which improves the calculation accuracy of the bottom hole flow pressure. The bottom hole flow pressure calculated using this theory reaches the accuracy used in engineering.
本方案公开的井底流压的测试方法，实现用悬点示功图计算煤层气井的井底流压，实现了动液面的自动实时监测，提高了煤层气井生产分析的实时性，有利于煤层气田数字化的信息化建设。The bottom hole flow pressure testing method disclosed in this scheme realizes the calculation of the bottom hole flow pressure of the coalbed methane well using the hanging point indicator diagram, realizes the automatic real-time monitoring of the dynamic liquid level, improves the real-time performance of the coalbed methane well production analysis, and is beneficial to the digital information construction of the coalbed methane field.
用上述技术方案中记载的获取粘滞阻力的方法获得粘滞阻力后，井底流压的计算精度，提升了40～50％。After obtaining the viscous resistance by the method for obtaining the viscous resistance recorded in the above technical solution, the calculation accuracy of the bottom hole flow pressure is improved by 40-50%.
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB501290A (en) * | 1937-08-24 | 1939-02-24 | Evelyn Stewart Lansdowne Beale | Improvements in pressure-recording instruments |
| CN2611602Y (en) * | 2003-03-06 | 2004-04-14 | 中国石油天然气股份有限公司 | High-temperature direct-reading downhole tester for heavy oil well |
| CN103886339A (en) * | 2013-06-14 | 2014-06-25 | 洛阳乾禾仪器有限公司 | Oil pumping device indicator diagram dynamic identification method and device based on BP neural network |
| CN105089638A (en) * | 2015-06-26 | 2015-11-25 | 中国石油化工股份有限公司胜利油田分公司 | Method for online calculation of working fluid level of oil well by using pumping unit pump indicator diagram |
| CN105257279A (en) * | 2015-10-26 | 2016-01-20 | 中国石油天然气股份有限公司 | Method for measuring working fluid level of pumping well |
| CN105649602A (en) * | 2015-12-31 | 2016-06-08 | 山东天工石油装备有限公司 | Method for achieving oil well working condition diagnosis based on ground dynamometer cards |
| CN106437682A (en) * | 2016-11-01 | 2017-02-22 | 中国石油集团东方地球物理勘探有限责任公司 | Method for predicting oil well indicator diagram |
| CN107145696A (en) * | 2017-06-29 | 2017-09-08 | 中国石油大学(北京) | A simulation method for coalbed methane aboveground and underground coupling solution |
| CN110219625A (en) * | 2019-02-22 | 2019-09-10 | 中国石油大学(华东) | Flood pot test system based on 3D printing three-dimensional fracture-pore reservoir model |
| CN110242261A (en) * | 2019-05-27 | 2019-09-17 | 中国石油大学(北京) | Prediction method and system of oil-gas-water microscopic seepage law in vertical gas injection pores |
| CN110821425A (en) * | 2019-12-31 | 2020-02-21 | 中国石油大学(华东) | Coal-bed gas well wall cleaning equipment and circulating well cleaning method |
| CN111005712A (en) * | 2019-11-18 | 2020-04-14 | 中国石油天然气股份有限公司 | Automatic identification method for offset wear of directional well rod pipe |
| CN111042779A (en) * | 2019-11-26 | 2020-04-21 | 大庆油田有限责任公司 | Method for calculating apparent water absorption index based on ground indicator diagram |
-
2020
- 2020-08-20 CN CN202010843075.1A patent/CN111946331B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB501290A (en) * | 1937-08-24 | 1939-02-24 | Evelyn Stewart Lansdowne Beale | Improvements in pressure-recording instruments |
| CN2611602Y (en) * | 2003-03-06 | 2004-04-14 | 中国石油天然气股份有限公司 | High-temperature direct-reading downhole tester for heavy oil well |
| CN103886339A (en) * | 2013-06-14 | 2014-06-25 | 洛阳乾禾仪器有限公司 | Oil pumping device indicator diagram dynamic identification method and device based on BP neural network |
| CN105089638A (en) * | 2015-06-26 | 2015-11-25 | 中国石油化工股份有限公司胜利油田分公司 | Method for online calculation of working fluid level of oil well by using pumping unit pump indicator diagram |
| CN105257279A (en) * | 2015-10-26 | 2016-01-20 | 中国石油天然气股份有限公司 | Method for measuring working fluid level of pumping well |
| CN105649602A (en) * | 2015-12-31 | 2016-06-08 | 山东天工石油装备有限公司 | Method for achieving oil well working condition diagnosis based on ground dynamometer cards |
| CN106437682A (en) * | 2016-11-01 | 2017-02-22 | 中国石油集团东方地球物理勘探有限责任公司 | Method for predicting oil well indicator diagram |
| CN107145696A (en) * | 2017-06-29 | 2017-09-08 | 中国石油大学(北京) | A simulation method for coalbed methane aboveground and underground coupling solution |
| CN110219625A (en) * | 2019-02-22 | 2019-09-10 | 中国石油大学(华东) | Flood pot test system based on 3D printing three-dimensional fracture-pore reservoir model |
| CN110242261A (en) * | 2019-05-27 | 2019-09-17 | 中国石油大学(北京) | Prediction method and system of oil-gas-water microscopic seepage law in vertical gas injection pores |
| CN111005712A (en) * | 2019-11-18 | 2020-04-14 | 中国石油天然气股份有限公司 | Automatic identification method for offset wear of directional well rod pipe |
| CN111042779A (en) * | 2019-11-26 | 2020-04-21 | 大庆油田有限责任公司 | Method for calculating apparent water absorption index based on ground indicator diagram |
| CN110821425A (en) * | 2019-12-31 | 2020-02-21 | 中国石油大学(华东) | Coal-bed gas well wall cleaning equipment and circulating well cleaning method |
Non-Patent Citations (4)
| Title |
|---|
| 尾管投球下落时间计算方法探讨;陈志峰;邹洁;刘海艳;中国石油和化工标准与质量(008);120-121 * |
| 李颖川.采油工程.石油工业出版社,2009,(第1版),81. * |
| 油气井压裂时地层岩石新的破裂压力计算模型的建立;边芳霞;林平;王力;王智博;邓志英;钻采工艺;27(006);19-23 * |
| 煤层气井有杆泵排采设备悬点载荷变化规律;刘新福;綦耀光;胡爱梅;韩军;杨磊;机械工程学报;47(015);127-134 * |
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