CN103774989A

CN103774989A - Horizontal well geosteering analysis method for designing track of well to be drilled through dynamic modeling during drilling

Info

Publication number: CN103774989A
Application number: CN201310659275.1A
Authority: CN
Inventors: 刘俊
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-12-10
Filing date: 2013-12-10
Publication date: 2014-05-07
Anticipated expiration: 2033-12-10
Also published as: CN103774989B

Abstract

The invention relates to a geosteering method for dynamic modeling during drilling and dynamic adjustment of the track in the process of horizontal well drilling of oil drilling. According to the solution, computer software is used, mutual multi-well comparison is carried out on target layer hierarchical data, target layer result structural maps, earthquake target layer pickup and multilateral well target layer data, and a plane difference algorithm is used, so that a target layer initial three-dimensional geological model is built; a two-dimensional geological model is extracted according to the track of a horizontal well which is being drilled, the direction of a drill bit is adjusted according to the spatial relation between the drilling track and the two-dimensional geological model, the vertical depth between the top and the bottom of the portion, arranged on each key point, of a target layer is obtained during drilling according to the electronic logging characteristics or the gasometry characteristics of special key points encountering a drill, such as a marker layer, a landing point, a bottom outlet, a bottom inlet, a top outlet, a top inlet and a special layer in the target layer, and the thickness uniformity principle, the three-dimensional geological model is adjusted, a two-dimensional geological model is extracted according to the track of the horizontal well which is being drilled, and the hole deviation angle of the drill bit is modified according to the dip angle provided by the two-dimensional geological model; the process is repeated, and it is ensured that the drilling direction of the drill bit is kept to be within the controllable range all the time. The hit rate and the drilling-encounter ratio of well drilling are improved, the drilling cycle is shortened, and drilling efficiency is improved.

Description

Treat wellbore trace design level well geosteering analytical method with boring dynamic modeling

Technical field

The present invention relates to one and pass through Dynamic Establishing geological model in horizontal well drilling process, design manually or automatically the method for track to be bored, bore encountering rate for the rate that hits of the well of improving the standard with at effective target zone.Relate in particular to a kind of application with boring the static geologic information in geological information and region, judge the relation of drill bit and target zone, and then revise in advance the good method of drill bit drilling direction.

Background technology

Along with the development of petroleum drilling technology, because oil reservoir is thin, the reason such as can production properties poor, the oil-gas reservoir that cannot commercialize in the past, can exploit by the mode of horizontal well drilling now.Especially in recent years the exploitation of coal bed gas, shale gas was more and more higher to the requirement of drilling technology, horizontal well drilling technology, as emerging drilling technology, has improved output, has improved production efficiency, the oil-gas reservoir that cannot exploit of making over obtains effective exploitation, in oil gas drilling, is more and more used.How oil-gas exploration production division, in horizontal well drilling process, leads to drill bit, how to guarantee that drill bit, always effectively creeping in target zone, is the key that improves drilling efficiency.At present, the method of geosteering also rests on, the multiple papery data of field by using, by means such as positive drilling well and offset well Linear Comparison, vertical contrasts and by observing the variation of electrical measurement curve and gas logging curve, judge the variation on stratum according to artificial experience, thus tentative adjustment wellbore trace.

At present, having some tool software in industry, is mainly to achievement data or phasic results data (being mainly static data), carry out the drawing of achievement map, with helping user, carry out geological analysis, geosteering directly perceived is played to certain help.

The problem that technology exists now:

But, because horizontal well drilling technology is the drilling technology just having risen in recent years.At present, so-called geosteering, usually refer to the well logging during equipment (LWD) that utilizes, the guiding after simple analysis is carried out in stratum, the degree of accuracy is not high, often occur the situation that mistake target leaks target, guarantee the brill encountering rate of effective interlayer, several curves that only provide together by well logging during are to can't resolve high problem of boring encountering rate.Conventional geological research means, the understanding to stratum static state often, is constantly to change to the understanding of destination layer in drilling course.Current technology can not meet with the needs that bore geological knowledge.And do not form at present a kind of normalized geosteering analytical model.

Summary of the invention

In order to improve the rate that hits of drilling well and to bore encountering rate, improve the efficiency of drilling well, the present invention proposes a set of dynamic geological modeling and dynamically adjusts geosteering thinking and the analytical method of track to be bored, and realize with software, can make scene and rear geological research personnel, in drilling process, have according to ground, evaluating objects layer comparatively exactly.And then in real time for engineering adjustment wellbore trace provides guidance.

We think that the rate that hits that improves destination layer with the key of boring encountering rate raising drilling efficiency is, understanding to destination layer and the optimization of wellbore trace, and dynamic understanding to destination layer will be controlled three key parameters: the destination layer degree of depth, top bottom boundaries and spatial shape.And these 3 parameters are the bases that form geological model directly perceived, model is constantly to change in drilling course, constantly adjusts Trajectory Design, only in this way the high efficiency of guarantee drilling well thereupon.Specific implementation is as follows:

1, by many well contrast modules are provided, offset well destination layer position is made an explanation, set up the initial top bed die type of destination layer; Or set up initial geological model by achievement constructional drawing.

2, obtain initial position, top bottom boundaries and the spatial shape of destination layer along planned course.

3, pass through the electrical curve comparison of reference lamina, according to uniform thickness principle to the top of destination layer corresponding points at the bottom of the degree of depth adjust, or by some special key points (as landed, eject, jacking, the end go out, the end is entered etc.), the degree of depth at the bottom of the top of corresponding model is adjusted, can also be by the degree of depth at the bottom of the top of model and Seismic Data Match adjustment model.

4, the stratigraphic dip providing according to the model after adjusting, in conjunction with present bit location hole angle, predicts track to be bored.

The invention has the beneficial effects as follows:

1, make whole geosteering work have guidance foundation, accomplished to shoot the arrow at the target.

2, owing to dynamically adjusting geological model, geomatics engineer is more and more approached objective to the understanding of destination layer, improved in the rate of hitting and layer and bored encountering rate.

3, dynamically Trajectory Design to be bored provides Automated Design and manual designs, makes with being drilled with meter preferably more simple and practical.

4, due to contrast, Dynamic Model adjustment, dynamically Trajectory Design optimization to be bored, whole system all, by completing, shortens drilling period greatly, has improved drilling efficiency, has saved drilling cost.

accompanying drawing explanation

Accompanying drawing 1 is to treat wellbore trace design level well geosteering analytical method structural representation with boring dynamic modeling.

Accompanying drawing 2 is to treat wellbore trace design level well geosteering analytical method realization flow schematic diagram with boring dynamic modeling.

52 mouthfuls of well well location tables of data in accompanying drawing 3 application examples

Well location distribution map in accompanying drawing 4 examples

The destination layer control point distribution map obtaining from 52 mouthfuls of well individual-layer datas and hole deviation data in accompanying drawing 5 examples

Thereby generate destination layer end face constructional drawing and structure ground plan formation destination layer three-dimensional geological body Model according to well location in accompanying drawing 6 examples

The destination layer D geology model that accompanying drawing 7 cuts out along positive Drilling Design track (or the real track that bores)

Accompanying drawing 8, according to offset well reference lamina and destination layer formation thickness, picks up positive drilling well destination layer control point

Accompanying drawing 9 is revised target spot according to the destination layer geological model of revising

Accompanying drawing 10 is according to revising target spot and current drill bit position Trajectory Design to be bored automatically

Figure hits after accompanying drawing 11 adjustment

Accompanying drawing is adjusted model and the model adjustment control point diagram after finally having led for more than 12 time

the specific embodiment

In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention will be described in detail.It should be noted that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.

The first step, utilize offset well to set up initial target layer geological model

Offset well data (accompanying drawing 3)

Offset well drawing position (accompanying drawing 4)

Position, offset well destination layer control point (accompanying drawing 5)

Utilize constructional drawing (accompanying drawing 6) at the bottom of the top of target zone model that plane difference value-based algorithm generates

Cut out model section (accompanying drawing 7) along track

Second step, by the electrical curve comparison of reference lamina, according to uniform thickness principle to the top of destination layer corresponding points at the bottom of the degree of depth adjust, or by some special key points (as landed, eject, jacking, the end go out, the end is entered etc.), the degree of depth at the bottom of the top of corresponding model is adjusted, can also be by the degree of depth at the bottom of the top of model and Seismic Data Match adjustment model.(accompanying drawing 8)

The 3rd step, correction target spot (accompanying drawing 9)

The 4th step, adjust track to be bored (accompanying drawing 10, accompanying drawing 11)

The 5th step, the above process that circulates complete whole geosteering work (accompanying drawing 12)

The foregoing is only preferred embodiment of the present invention, be not limited to the present invention, all any modifications of doing within principle of the present invention and spirit, be equal to and replace and improvement etc., within being all just included in protection scope of the present invention.

Claims

A method that improves the rate that hits and brill encountering rate in drilling course, method content comprises:

1. confirm to pick up and Multilateral Wells destination layer data by mutual many well contrast (destination layer individual-layer data), destination layer achievement constructional drawings, earthquake destination layer, by plane difference value-based algorithm, set up the initial three-dimensional geological model of destination layer.
2. confirm to extract two dimensional model (degree of depth, the end, top, spatial shape) along well track.
3. confirm in drill ga(u)ge journey, utilize and bore electrical measurement or the gas of meeting key point (reference lamina, landing point, the end go out, the end is entered, eject, jacking and destination layer in special layers) and survey feature, according to uniform thickness principle, the top dolly of destination layer that obtains each key point place is dark.
4. confirm by plane difference value-based algorithm, revise three-dimensional geological model.
5. again extract two dimensional model along well track.
6. by measuring stratigraphic dip now, adjust wellbore trace.
7. make the rate that effectively hits of drilling well and bore encountering rate to be greatly improved.